US20110157696A1 - Display with adaptable parallax barrier - Google Patents
Display with adaptable parallax barrier Download PDFInfo
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- US20110157696A1 US20110157696A1 US12/845,409 US84540910A US2011157696A1 US 20110157696 A1 US20110157696 A1 US 20110157696A1 US 84540910 A US84540910 A US 84540910A US 2011157696 A1 US2011157696 A1 US 2011157696A1
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Definitions
- the present invention relates to three-dimensional image displays.
- Images may be generated for display in various forms.
- television is a widely used telecommunication medium for transmitting and displaying images in monochromatic (“black and white”) or color form.
- images are provided in analog form and are displayed by display devices in two-dimensions.
- images are being provided in digital form for display in two-dimensions on display devices having improved resolution (e.g., “high definition” or “HD”).
- HD high definition
- Conventional displays may use a variety of techniques to achieve three-dimensional image viewing functionality.
- various types of glasses have been developed that may be worn by users to view three-dimensional images displayed by a conventional display.
- glasses include glasses that utilize color filters or polarized filters.
- the lenses of the glasses pass two-dimensional images of differing perspective to the user's left and right eyes.
- the images are combined in the visual center of the brain of the user to be perceived as a three-dimensional image.
- synchronized left eye, right eye LCD (liquid crystal display) shutter glasses may be used with conventional two-dimensional displays to create a three-dimensional viewing illusion.
- LCD display glasses are being used to display three-dimensional images to a user.
- the lenses of the LCD display glasses include corresponding displays that provide images of differing perspective to the user's eyes, to be perceived by the user as three-dimensional.
- a display device of this type may be switched to a three-dimensional mode for viewing of three-dimensional images, and may be switched to a two-dimensional mode for viewing of two-dimensional images (and/or to provide a respite from the viewing of three-dimensional images).
- a parallax barrier is another example of a device that enables images to be displayed in three-dimensions.
- a parallax barrier includes of a layer of material with a series of precision slits. The parallax barrier is placed proximal to a display so that a user's eyes each see a different set of pixels to create a sense of depth through parallax.
- a disadvantage of parallax barriers is that the viewer must be positioned in a well-defined location in order to experience the three-dimensional effect. If the viewer moves his/her eyes away from this “sweet spot,” image flipping and/or exacerbation of the eyestrain, headaches and nausea that may be associated with prolonged three-dimensional image viewing may result.
- Conventional three-dimensional displays that utilize parallax barriers are also constrained in that the displays must be entirely in a two-dimensional image mode or a three-dimensional image mode at any time.
- FIG. 1 shows a block diagram of a display system, according to an example embodiment.
- FIGS. 2A and 2B show block diagrams of examples of the display system of FIG. 1 , according to embodiments.
- FIG. 3 shows a view of a surface of a parallax barrier, according to an example embodiment.
- FIGS. 4 and 5 show views of a barrier element of a barrier element array that is selected to be transparent and to be opaque, respectively, according to example embodiments.
- FIG. 6 shows a flowchart for generating three-dimensional images, according to an example embodiment.
- FIG. 7 shows a cross-sectional view of an example of a display system, according to an embodiment.
- FIGS. 8A and 8B shows view of example parallax barriers with non-blocking slits, according to embodiments.
- FIG. 9 shows a block diagram of a barrier array controller, according to an example embodiment.
- FIG. 10 shows an example display system configured to generate three-dimensional images, according to an example embodiment.
- FIG. 11 shows the display system of FIG. 7 providing a three-dimensional image to a user, according to an example embodiment.
- FIG. 12 shows a process for forming a two-dimensional image, according to an example embodiment.
- FIG. 13 shows a process for modifying a parallax barrier to modify display characteristics, according to example embodiments.
- FIG. 14 shows a view of the parallax barrier of FIG. 3 with increased spacing between non-blocking slits, according to an example embodiment.
- FIG. 15 shows a display system with increased spacing between non-blocking slits, according to an example embodiment.
- FIG. 16 shows a view of the parallax barrier of FIG. 3 with alternative width non-blocking slits, according to an example embodiment.
- FIG. 17 shows a process for configuring a parallax barrier to display differently oriented three-dimensional images, according to example embodiments.
- FIGS. 18 and 19 show views of the parallax barrier of FIG. 3 with alternatively oriented non-blocking slits, according to an example embodiment.
- FIG. 20 shows a block diagram of a display environment, according to an example embodiment.
- FIG. 21 shows a block diagram of a remote device, according to an example embodiment.
- FIG. 22 shows a block diagram of a display device, according to an example embodiment.
- FIG. 23 shows a block diagram of an example display controller, according to an embodiment.
- references in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
- Embodiments of the present invention relate to display devices that include a parallax barrier that may be dynamically modified, thereby changing the manner in which images are delivered to the eyes of one or more viewers.
- the parallax barrier may be configured to enable the adaptive display of multiple types of images to users. For instance, embodiments enable the adaptive accommodation of a changing viewer sweet spot, and switching between two-dimensional (2D) and stereoscopic three-dimensional (3D) images.
- Example features of the parallax barrier that may be dynamically modified include one or more of a number of slits in the parallax barrier, the dimensions of each slit, the spacing between the slits, and the orientation of the slits.
- a display device may include an adaptive parallax barrier to enable various display capabilities.
- FIG. 1 shows a block diagram of a display system 100 , according to an example embodiment.
- system 100 includes a display device 112 .
- Display device 112 is capable of displaying 2D and 3D images as described above.
- display device 112 includes a image generator 102 and a parallax barrier 104 .
- image generator 102 includes a pixel array 114 and may optionally include backlighting 116 .
- Image generator 102 and parallax barrier 104 operate to generate 2D and/or 3D images that are viewable by users/viewers in a viewing space 106 .
- parallax barrier 104 is shown positioned between image generator 102 and viewing space 106 in FIG. 1 , as further described below, parallax barrier 104 may alternatively be positioned between portions of image generator 102 (e.g., between pixel array 114 and backlighting 116 ).
- backlighting 116 emits light that is filtered by parallax barrier 104 , and the filtered light is received by pixel array 114 , which imposes image information on the filtered light by performing further filtering.
- pixel array 114 may be configured to emit light which includes the image information, and the light is filtered by parallax barrier 104 .
- Parallax barrier 104 operates as an image filter or “light manipulator” to filter received light with a plurality of barrier elements (also referred to as “blocking regions”) that are selectively substantially opaque or transparent to generate three-dimensional images from the image information provided by pixel array 114 .
- the image information may include one or more still images, motion (e.g., video) images, etc.
- Filtered light 110 may include a two-dimensional image or a three-dimensional image (e.g., formed by a pair of two-dimensional images in filtered light 110 ), for instance. Filtered light 110 is received in viewing space 106 proximate to display device 112 . One or more users may be present in viewing space 106 to view the images included in filtered light 110 .
- Display device 112 may be implemented in various ways.
- display device 112 may be a television display (e.g., an LCD (liquid crystal display) television, a plasma television, etc.), a computer monitor, or any other type of display device.
- Image generator 102 may be any suitable type or combination of light and image generating devices, including an LCD screen, a plasma screen, an LED (light emitting device) screen (e.g., an OLED (organic LED) screen), etc.
- Parallax barrier 104 may be any suitable light filtering device, including an LCD filter, a mechanical filter (e.g., that incorporates individually controllable shutters), etc., and may be configured in any manner, including as a thin-film device (e.g., formed of a stack of thin film layers), etc.
- Backlighting 116 may be any suitable light emitting device, including a panel of LEDs or other light emitting elements.
- FIG. 2A shows a block diagram of a display system 200 , which is an example of system 100 shown in FIG. 1 , according to an embodiment.
- system 200 includes a display device controller 202 and a display device 250 (which includes image generator 102 and parallax barrier 104 ).
- Display device 250 is an example of display device 112 in FIG. 1 .
- image generator 102 includes a pixel array 208 (which is an example of pixel array 114 of FIG. 1 ), and parallax barrier 104 includes a barrier element array 210 .
- display controller 202 includes a pixel array controller 204 and a barrier array controller 206 .
- Pixel array 208 includes a two-dimensional array of pixels (e.g., arranged in a grid or other distribution). Pixel array 208 is a self-illuminating or light-generating pixel array such that the pixels of pixel array 208 each emit light included in light 252 emitted from image generator 102 . Each pixel may be a separately addressable light source (e.g., a pixel of a plasma display, an LCD display, an LED display such as an OLED display, or of other type of display). Each pixel of pixel array 208 may be individually controllable to vary color and intensity. In an embodiment, each pixel of pixel array 208 may include a plurality of sub-pixels that correspond to separate color channels, such as a trio of red, green, and blue sub-pixels included in each pixel.
- a trio of red, green, and blue sub-pixels included in each pixel such as a trio of red, green, and blue sub-pixels included in each pixel.
- Parallax barrier 104 is positioned proximate to a surface of pixel array 208 .
- Barrier element array 210 is a layer of parallax barrier 104 that includes a plurality of barrier elements or blocking regions arranged in an array. Each barrier element of the array is configured to be selectively opaque or transparent.
- FIG. 3 shows a parallax barrier 300 , according to an example embodiment.
- Parallax barrier 300 is an example of parallax barrier 104 of FIG. 2A .
- parallax barrier 300 includes a barrier element array 302 .
- Barrier element array 302 includes a plurality of barrier elements 304 arranged in a two-dimensional array (e.g., arranged in a grid), although in other embodiments, may include barrier elements 304 arranged in other ways.
- Barrier elements 304 may each be a pixel of an LCD, a moveable mechanical element (e.g., a hinged flap that passes light in a first position and blocks light in a second position), a magnetically actuated element, or other suitable barrier element.
- Each barrier element 304 is shown in FIG. 3 as rectangular (e.g., square) in shape, but in other embodiments may have other shapes.
- each barrier element 304 may have a “band” shape that extends a vertical length of barrier element array 302 , such that barrier element array 302 includes a single horizontal row of barrier elements 304 .
- Each barrier element 304 may include one or more of such bands, and different portions of barrier element array 302 may include barrier elements 304 that include different numbers of such bands.
- One advantage of such a configuration is that barrier elements 304 extending a vertical length of barrier element array 302 do not need to have spacing between them because there is no need for drive signal routing in such space.
- a transistor-plus-capacitor circuit is typically placed onsite at the corner of a single pixel in the array, and control signals for such transistors are routed between the LCD pixels (row-column control, for example).
- row-column control for example.
- local transistor control may not be necessary because barrier elements 304 may not need to be changing as rapidly as display pixels (e.g., pixels of pixel array 208 ).
- control signals may be routed to the top and/or bottom of barrier elements 304 .
- the vertical bands can be arranged side-by-side with little-to-no space in between.
- one band or multiple adjacent bands e.g., five bands
- one band or multiple adjacent bands e.g., five bands
- the vertical bands may comprise a barrier element 304 in a blocking state, followed by one band or multiple adjacent bands (e.g., two bands) that comprise a barrier element 304 in a non-blocking state (a slit), and so on.
- the five bands may combine to offer a single black barrier element of approximately 2.5 times the width of a single transparent slit with no spaces therein.
- Barrier element array 302 may include any number of barrier elements 304 .
- barrier element array 302 includes twenty-eight barrier elements 304 along an x-axis and includes twenty barrier elements 304 along a y-axis, for a total number of five hundred and sixty barrier elements 304 .
- these dimensions of barrier element array 302 and the total number of barrier elements 304 for barrier element array 302 shown in FIG. 3 are provided for illustrative purposes, and are not intended to be limiting.
- Barrier element array 302 may include any number of barrier elements 304 , and may have any array dimensions, including ones, tens, hundreds, thousands, or even larger numbers of barrier elements 304 along each of the x- and y-axes.
- the width of one barrier element in a barrier element array may be a multiple or divisor of a corresponding display pixel width (e.g., a width of a pixel of pixel array 114 ).
- a number of columns/rows in a barrier element array may be a multiple or divisor of a corresponding number of columns/rows of pixels in a corresponding pixel array.
- Each barrier element 304 of barrier element array 302 is selectable to be substantially opaque or transparent.
- FIG. 4 shows a barrier element 304 x that is selected to be substantially transparent
- FIG. 5 shows barrier element 304 x when selected to be substantially opaque, according to example embodiments.
- barrier element 304 x is selected to be transparent, light 252 from pixel array 208 may pass through barrier element 304 x (e.g., to viewing space 106 ).
- barrier element 304 x is selected to be opaque, light 252 from pixel array 208 is blocked from passing through barrier element 304 x.
- barrier elements 304 of barrier element array 302 By selecting some of barrier elements 304 of barrier element array 302 to be transparent, and some of barrier elements 304 of barrier element array 302 to be opaque, light 252 received at barrier element array 302 is filtered to generate filtered light 110 . It is noted that in some embodiments, barrier elements may capable of being completely transparent or opaque, and in other embodiments, barrier elements may not be capable of being fully transparent or opaque.
- barrier elements may be capable of being 95% transparent when considered to be “transparent” and may be capable of being 5% transparent when considered to be “opaque.”
- Transparent and opaque as used herein are intended to encompass barrier elements being substantially transparent (e.g., greater than 75% transparent, including completely transparent) and substantially opaque (e.g., less than 25% transparent, including completely opaque), respectively.
- Display controller 202 is configured to generate control signals to enable display device 250 to display two-dimensional and three-dimensional images to users 218 in viewing space 106 .
- pixel array controller 204 is configured to generate a control signal 214 that is received by pixel array 208 .
- Control signal 214 may include one or more control signals used to cause pixels of pixel array 208 to emit light 252 of particular desired colors and/or intensity.
- Barrier array controller 206 is configured to generate a control signal 216 that is received by barrier element array 210 .
- Control signal 216 may include one or more control signals used to cause each of barrier elements 304 of barrier element array 302 to be transparent or opaque.
- barrier element array 210 filters light 252 to generate filtered light 110 that includes one or more two-dimensional and/or three-dimensional images that may be viewed by users 218 in viewing space 106 .
- control signal 214 may control sets of pixels of pixel array 208 to each emit light representative of a respective image, to provide a plurality of images.
- Control signal 216 may control barrier elements 304 of barrier element array 210 to filter the light received from pixel array 208 according to the provided images such that one or more of the images are received by users 218 in two-dimensional form. For instance, in a first mode, control signal 216 may select the barrier elements 304 of barrier element array 302 to be transparent, to transmit a two-dimensional image or view to users 218 .
- control signal 216 may control sections of barrier element array 210 to include opaque and transparent barrier elements 304 to filter the light received from pixel array 208 so that a pair of images or views provided by pixel array 208 is received by users 218 as a corresponding three-dimensional image or view.
- control signal 216 may select parallel strips of barrier elements 304 of barrier element array 302 to be transparent to form slits that enable three-dimensional images to be received by users 218 .
- control signal 216 may be generated by barrier array controller 206 to configure one or more characteristics of barrier element array 210 .
- control signal 216 may be generated to form any number of parallel strips of barrier elements 304 of barrier element array 302 to be transparent, to modify the number and/or spacing of parallel strips of barrier elements 304 of barrier element array 302 that are transparent, to select and/or modify a width and/or a length (in barrier elements 304 ) of one or more strips of barrier elements 304 of barrier element array 302 that are transparent or opaque, to select and/or modify an orientation of one or more strips of barrier elements 304 of barrier element array 302 that are transparent, etc.
- FIG. 2B shows a block diagram of a display system 220 , which is another example of system 100 shown in FIG. 1 , according to an embodiment.
- system 220 includes display device controller 202 and a display device 260 , which includes a pixel array 222 , parallax barrier 104 , and backlighting 116 .
- Display device 260 is an example of display device 112 in FIG. 1 .
- parallax barrier 104 includes barrier element array 210 and backlighting 116 includes a light element array 236 .
- display controller 202 includes a pixel array controller 228 , barrier array controller 206 , and a light source controller 230 .
- pixel array 222 and backlighting 116 form an example of image generator 102 of FIG. 1 .
- Backlighting 116 is a backlight panel that emits light 238 .
- Light element array 236 (or “backlight array”) of backlighting 116 includes a two-dimensional array of light sources. Such light sources may be arranged, for example, in a rectangular grid. Each light source in light element array 236 is individually addressable and controllable to select an amount of light emitted thereby.
- a single light source may comprise one or more light-emitting elements depending upon the implementation.
- each light source in light element array 236 comprises a single light-emitting diode (LED) although this example is not intended to be limiting.
- LED light-emitting diode
- Parallax barrier 104 is positioned proximate to a surface of backlighting 116 (e.g., a surface of the backlight panel).
- barrier element array 210 is a layer of parallax barrier 104 that includes a plurality of barrier elements or blocking regions arranged in an array. Each barrier element of the array is configured to be selectively opaque or transparent.
- FIG. 3 shows a parallax barrier 300 , which is an example of parallax barrier 104 of FIG. 2B .
- Barrier element array 210 filters light 238 received from backlighting 116 to generate filtered light 240 .
- Filtered light 240 is configured to enable a two-dimensional image or a three-dimensional image (e.g., formed by a pair of two-dimensional images in filtered light 110 ) to be formed based on images subsequently imposed on filtered light 240 by pixel array 222 .
- pixel array 222 of FIG. 2B includes a two-dimensional array of pixels (e.g., arranged in a grid or other distribution).
- pixel array 222 is not self-illuminating, and instead is a light filter that imposes images (e.g., in the form of color, grayscale, etc.) on filtered light 240 from parallax barrier 104 to generate filtered light 110 to include one or more images.
- Each pixel of pixel array 222 may be a separately addressable filter (e.g., a pixel of a plasma display, an LCD display, an LED display, or of other type of display).
- Each pixel of pixel array 208 may be individually controllable to vary the color imposed on the corresponding light passing through, and/or to vary the intensity of the passed light in filtered light 110 .
- each pixel of pixel array 222 may include a plurality of sub-pixels that correspond to separate color channels, such as a trio of red, green, and blue sub-pixels included in each pixel.
- Display controller 202 of FIG. 2B is configured to generate control signals to enable display device 260 to display two-dimensional and three-dimensional images to users 218 in viewing space 106 .
- light source controller 230 within display controller 202 controls the amount of light emitted by each light source in light element array 236 by generating a control signal 234 that is received by light element array 236 .
- Control signal 234 may include one or more control signals used to control the amount of light emitted by each light source in light element array 236 to generate light 238 .
- barrier array controller 206 is configured to generate control signal 216 received by barrier element array 210 .
- Control signal 216 may include one or more control signals used to cause each of barrier elements 304 of barrier element array 302 to be transparent or opaque, to filter light 238 to generate filtered light 240 .
- Pixel array controller 228 is configured to generate a control signal 232 that is received by pixel array 222 .
- Control signal 232 may include one or more control signals used to cause pixels of pixel array 208 to impose desired images (e.g., colors, grayscale, etc.) on filtered light 240 as it passes through pixel array 208 . In this manner, pixel array 222 generates filtered light 110 that includes one or more two-dimensional and/or three-dimensional images that may be viewed by users 218 in viewing space 106 .
- control signal 234 may control sets of light sources of light element array 236 to emit light 238 .
- Control signal 216 may control barrier elements 304 of barrier element array 210 to filter light 238 received from light element array 236 to enable filtered light 240 to enable two- and/or three-dimensionality.
- Control signal 232 may control sets of pixels of pixel array 222 to filter filtered light 240 according to respective images, to provide a plurality of images. For instance, in a first mode, control signal 216 may select the barrier elements 304 of barrier element array 302 to be transparent, to transmit a two-dimensional image to users 218 .
- control signal 216 may control sections of barrier element array 210 to include opaque and transparent barrier elements 304 to filter the light received from light element array 236 so that a pair of images provided by pixel array 222 is received by users 218 as a corresponding as three-dimensional image.
- control signal 216 may select parallel strips of barrier elements 304 of barrier element array 302 to be transparent to form slits that enable three-dimensional images to be received by users 218 .
- FIG. 6 shows a flowchart 600 for generating images that are delivered to users in a viewing space, according to an example embodiment.
- Flowchart 600 may be performed by system 200 in FIG. 2A or system 220 of FIG. 2B , for example.
- Flowchart 600 is described with respect to FIG. 7 , which shows a cross-sectional view of a display system 700 .
- Display system 700 is an example embodiment of system 200 shown in FIG. 2A , and is shown for purposes of illustration.
- system 700 includes a pixel array 702 and a barrier element array 704 .
- system 700 may further include backlighting in a configuration similar to display system 220 of FIG. 2B .
- backlighting in a configuration similar to display system 220 of FIG. 2B .
- Flowchart 600 begins with step 602 .
- step 602 light is received at an array of barrier elements.
- light 252 is received at parallax barrier 104 from pixel array 208 of image generator 102 .
- Each pixel of pixel array 208 may generate light that is received at parallax barrier 104 .
- parallax barrier 104 may filter light 252 from pixel array 208 to generate a two-dimensional image or a three-dimensional image viewable in viewing space 106 by users 218 .
- light 238 may be received by parallax barrier 104 from light element array 236 .
- the array of barrier elements is configured into a first parallax barrier configuration that has a first set of the barrier elements of the array of barrier elements in the blocking state and a second set of the barrier elements of the array of barrier elements in the non-blocking state to provide the viewer located at a first position with a three-dimensional view.
- a three-dimensional image may be desired to be viewable in viewing space 106 .
- barrier array controller 206 may generate control signal 216 to configure barrier element array 210 to include transparent strips of barrier elements to enable a three-dimensional view to be formed. For example, as shown in FIG.
- barrier element array 704 includes a plurality of barrier elements that are each either transparent (in a non-blocking state) or opaque (in a blocking state). Barrier elements that are blocking are indicated as barrier elements 710 a - 710 f, and barrier elements that are non-blocking are indicated as barrier elements 712 a - 712 e. Further barrier elements may be included in barrier element array 704 that are not visible in FIG. 7 . Each of barrier elements 710 a - 710 f and 712 a - 712 e may include one or more barrier elements.
- Barrier elements 710 alternate with barrier elements 712 in series in the order of barrier elements 710 a, 712 a, 710 b, 712 b, 710 c, 712 c, 710 d, 712 d, 710 e, 712 e, and 710 f . In this manner, blocking barrier elements 710 are alternated with non-blocking barrier elements 712 to form a plurality of parallel non-blocking or transparent slits in barrier element array 704 .
- FIG. 8A shows a view of parallax barrier 300 of FIG. 3 with transparent slits, according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips (or “slits”) 802 a - 802 g.
- slits parallel non-blocking strips
- non-blocking strips 802 a - 802 g are alternated with parallel opaque or blocking strips 804 a - 804 g of barrier elements 304 that are selected to be blocking.
- non-blocking strips 802 a - 802 g and blocking strips 804 a - 804 g each have a width (along the x-dimension) of two barrier elements 304 , and have lengths that extend along the entire y-dimension (twenty barrier elements 304 ) of barrier element array 304 , although in other embodiments, may have alternative dimensions.
- Non-blocking strips 802 a - 802 g and blocking strips 804 a - 804 g form a parallax barrier configuration for parallax barrier 300 .
- the spacing (and number) of parallel non-blocking strips 802 in barrier element array 704 may be selectable by choosing any number and combination of particular strips of barrier elements 304 in barrier element array 302 to be non-blocking, to be alternated with blocking strips 804 , as desired.
- FIG. 8B shows a parallax barrier 310 that is another example of barrier element array 704 with parallel transparent slits, according to an embodiment.
- parallax barrier 310 has includes a barrier element array 312 , which includes a plurality of barrier elements 314 arranged in a two-dimensional array (28 by 1 array).
- Barrier elements 314 have widths (along the x-dimension) similar to the widths of barrier elements 304 in FIG. 8A , but have lengths that extend along the entire vertical length (y-dimension) of barrier element array 314 . As shown in FIG.
- barrier element array 312 includes parallel non-blocking strips 802 a - 802 g alternated with parallel blocking strips 804 a - 804 g.
- parallel non-blocking strips 802 a - 802 g and parallel blocking strips 804 a - 804 g each have a width (along the x-dimension) of two barrier elements 314 , and have lengths that extend along the entire y-dimension (one barrier element 314 ) of barrier element array 312 .
- Barrier element array 210 of parallax barrier 210 is configured to filter light 252 received from pixel array 208 ( FIG. 2A ) or light 238 received from light element array 236 ( FIG. 2B ) according to whether barrier element array 210 is transparent or non-blocking (e.g., in a two-dimensional mode) or includes parallel non-blocking strips (e.g., in a three-dimensional mode). If barrier element array 210 is transparent (e.g., as shown for barrier element array 302 in FIG.
- barrier element array 210 functions as an “all pass” filter to substantially pass all of light 252 as filtered light 110 to deliver the two-dimensional image generated by pixel array 208 to viewing space 106 , to be viewable as a two-dimensional image in a similar fashion as a conventional display. If barrier element array 210 includes parallel non-blocking strips (e.g., as shown for barrier element array 302 in FIGS. 8A and 8B ), barrier element array 210 passes a portion of light 252 as filtered light 110 to deliver a three-dimensional image to viewing space 106 .
- pixel array 702 includes a plurality of pixels 714 a - 714 d and 716 a - 716 d. Pixels 714 alternate with pixels 716 , such that pixels 714 a - 714 d and 716 a - 716 d are arranged in series in the order of pixels 714 a, 716 a, 714 b, 716 b , 714 c, 716 c, 714 d, and 716 d. Further pixels may be included in pixel array 702 that are not visible in FIG.
- pixels 714 a - 714 d and 716 a - 716 d generates light, which emanates from display surface 724 of pixel array 702 (e.g., generally upward in FIG. 7 ) towards barrier element array 704 .
- Some example indications of light emanating from pixels 714 a - 714 d and 716 a - 716 d are shown in FIG. 7 (as dotted lines), including light 724 a and light 718 a emanating from pixel 714 a, light 724 b, light 718 b , and light 724 c emanating from pixel 714 b, etc.
- light emanating from pixel array 702 is filtered by barrier element array 704 to form a plurality of images in a viewing space 726 , including a first image 706 a at a first location 708 a and a second image 706 b at a second location 708 b.
- a portion of the light emanating from pixel array 702 is blocked by blocking barrier elements 710 , while another portion of the light emanating from pixel array 702 passes through non-blocking barrier elements 712 , according to the filtering by barrier element array 704 .
- light 724 a from pixel 714 a is blocked by blocking barrier element 710 a
- light 724 b and light 724 c from pixel 714 b are blocked by blocking barrier elements 710 b and 710 c, respectively.
- light 718 a from pixel 714 a is passed by non-blocking barrier element 712 a
- light 718 b from pixel 714 b is passed by non-blocking barrier element 712 b.
- system 700 shown in FIG. 7 is configured to form first and second images 706 a and 706 b at locations 708 a and 708 b, respectively, which are positioned at a distance 728 from pixel array 702 (as shown in FIG. 7 , further instances of first and second images 706 a and 706 b may be formed in viewing space 726 according to system 700 , in a repeating, alternating fashion).
- pixel array 702 includes a first set of pixels 714 a - 714 d and a second set of pixels 716 a - 716 d. Pixels 714 a - 714 d correspond to first image 706 a and pixels 716 a - 716 d correspond to second image 706 b. Due to the spacing of pixels 714 a - 714 d and 716 a - 716 d in pixel array 702 , and the geometry of non-blocking barrier elements 712 in barrier element array 704 , first and second images 706 a and 706 b are formed at locations 708 a and 708 b, respectively. As shown in FIG.
- light 718 a - 718 d from the first set of pixels 714 a - 714 d is focused at location 708 a to form first image 706 a at location 708 a.
- Light 720 a - 720 d from the second set of pixels 716 a - 716 d is focused at location 708 b to form second image 706 b at location 708 b.
- FIG. 7 shows a slit spacing 722 (center-to-center) of non-blocking barrier elements 712 in barrier element array 704 .
- Spacing 722 may be determined to select locations for parallel non-blocking slits to be formed in barrier element array 704 for a particular image distance 728 at which images are desired to be formed (for viewing by users). For example, in an embodiment, if a spacing of pixels 714 a - 714 d corresponding to an image is known, and a distance 728 at which the image is desired to be displayed is known, the spacing 722 between adjacent parallel non-blocking slits in barrier element array 704 may be selected. As shown in FIG. 9 , in an embodiment, barrier array controller 206 (of FIG.
- Slit spacing calculator 902 is configured to calculate spacing 722 for a particular spacing of pixels and a desired distance for the corresponding image to be formed, according to corresponding parallax barrier configurations.
- FIG. 10 shows an example display system 1000 , according to an example embodiment.
- Display system 1000 is generally similar to system 700 shown in FIG. 7 , and includes pixel array 702 and barrier element array 704 .
- Pixel array 702 includes pixels 714 a - 714 d and 716 a - 716 d
- barrier element array 704 includes blocking barrier elements 710 a - 710 f and non-blocking barrier elements 712 a - 712 e.
- An image 1002 is desired to be formed at an image distance 1004 from pixel array 702 based on pixels 714 a - 714 d.
- Barrier element array 704 is separated from pixel array 702 by a distance 1012 .
- Adjacent pixels of pixels 714 a - 714 d are separated by a pixel separation distance 1006 .
- Spacing 722 for adjacent non-blocking barrier elements 712 a - 712 e is desired to be selected to enable image 1002 to be formed at distance 1004 from pixel array 702 .
- equation (Equation 1) holds:
- spacing 722 may be calculated (e.g., by slit spacing calculator 902 ) according to Equation 2 shown below, where slit spacing 722 is less than pixel separation distance 1006 :
- spacing 722 distance 1006 ⁇ (distance 1004 ⁇ distance 1012)/distance 1004 Equation 2
- distance 1006 may equal 1.0 mm
- distance 1004 may equal 2.0 meters
- distance 1012 may equal 5.0 mm.
- spacing 722 may be calculated according to Equation 2 as follows:
- the centers of adjacent non-blocking barrier elements 712 a - 712 e may be separated by spacing 722 of 0.9975 mm to form image 1002 at 2.0 meters from pixel array 702 .
- light 1010 a - 1010 d emanated by pixels 714 a - 714 d, as filtered by barrier element array 704 forms image 1002 at location 1008 .
- Separating the centers of adjacent non-blocking barrier elements 712 a - 712 e by 0.9975 mm (or other determined distance) may be accomplished in various ways, depending on the particular configuration of barrier element array 704 .
- a single barrier element width non-blocking slit may be formed in barrier element array 704 every 0.9975 mm.
- a non-blocking slit may be formed in barrier element array 704 every 0.9975 mm having a width of more than one barrier element.
- one or more non-blocking barrier elements may be alternated with one or more blocking barrier elements to for non-blocking slits every 0.9975 mm.
- ten non-blocking barrier elements 712 each having a width of 0.0025 mm may be alternated with three hundred and eighty-nine blocking barrier elements 710 each having the width of 0.0025 mm in barrier element array 704 .
- first and second images 706 a and 706 b may be formed by display system 700 at a distance 728 from pixel array 702 by calculating a value for slit spacing 722 as described above.
- Equation 2 is provided as one example technique for selecting non-blocking slit spacing, for purposes of illustration.
- other techniques may be used to calculate and/or determine values for slit spacing 722 .
- a lookup table that includes pre-calculated values for slit spacing 722 may be maintained by barrier array controller 206 . The lookup table may be used to look up values for slit spacing 722 for corresponding values of image distance 1004 and pixel spacing 1006 .
- pixel array 702 and barrier element array 704 are each shown as being substantially planar. In other embodiments, pixel array 702 and/or barrier element array 704 may be curved (e.g., concave or convex relative to viewing space 726 ). As such, equations, lookup tables, etc., used to calculate values for slit spacing 722 and/or other parameters of a display system may be configured to account for such curvature, in a manner as would be known to persons skilled in the relevant art(s).
- First and second images 706 a and 706 b are configured to be perceived by a user as a three-dimensional image or view.
- FIG. 11 shows display system 700 of FIG. 7 , where a user 1104 receives first image 706 a at a first eye location 1102 a and second image 706 b at a second eye location 1102 b, according to an example embodiment.
- First and second images 706 a and 706 b may be generated by first set of pixels 714 a - 714 d and second set of pixels 716 a - 716 d as images that are slightly different perspective from each other.
- Images 706 a and 706 b are combined in the visual center of the brain of user 1104 to be perceived as a three-dimensional image or view.
- first and second images 706 a and 706 b may be formed by display system 700 such that their centers are spaced apart a width of a user's pupils (e.g., an “interocular distance” 1106 ).
- the spacing of first and second images 706 a and 706 b may be approximately 65 mm (or other suitable spacing) to generally be equivalent to interocular distance 1106 .
- multiple instances of first and second images 706 a and 706 b may be formed by display system 700 that repeat in a viewing space.
- first and second images 706 a and 706 b shown in FIG. 11 coinciding with the left and right eyes of user 1104 may be separated by one or more instances of first and second images 706 a and 706 b of the repeating instances that happen to be separated by interocular distance 1106 .
- the array of barrier elements is configured into a second parallax barrier configuration that includes a third set of the barrier elements of the array of barrier elements in the blocking state and a fourth set of the barrier elements of the array of barrier elements in the non-blocking state to provide the viewer located at a second position with the three-dimensional view.
- user 1102 of FIG. 11 may change positions in viewing space 106 ( FIG. 1 ), and as such parallax barrier 104 may adapt to a different parallax barrier configuration to cause the three-dimensional view to be moved from the first position of user 1102 to the second position of user 1102 .
- parallax barrier 104 may adapt to a different parallax barrier configuration to cause the three-dimensional view to be moved from the first position of user 1102 to the second position of user 1102 .
- FIG. 1 parallax barrier configuration
- barrier array controller 206 may generate control signal 216 to configure barrier element array 210 to include transparent strips of barrier elements configured to enable the three-dimensional view to be formed at the second position.
- control signal 216 to configure barrier element array 210 to include transparent strips of barrier elements configured to enable the three-dimensional view to be formed at the second position.
- FIGS. 7 and 11 show display system 700 having a configuration similar to display system 200 of FIG. 2A
- display system 700 may be configured similarly to display system 220 of FIG. 2B to generate images 706 a and 706 b in viewing space 726 .
- barrier element array 704 may be positioned between a backlighting panel (that is positioned where pixel array 702 is shown in FIGS. 7 and 10 ) and pixel array 702 , and pixel array 702 is configured as a light filter (is not light emitting).
- the backlighting panel emits light that is filtered by barrier element array 704 as described above, and the filtered light is filtered by pixel array 702 to impose images on the light filtered by pixel array 702 , forming images 706 a and 706 b as shown in FIGS. 7 and 10 .
- display system 700 may be configured to generate a two-dimensional image for viewing by users in a viewing space.
- flowchart 600 FIG. 6
- the array of barrier elements is configured into a third configuration to deliver a two-dimensional view.
- barrier array controller 206 may generate control signal 216 to configure each barrier element of barrier element array 210 to be in the non-blocking state (transparent).
- barrier element array 210 may be configured similarly to barrier element array 302 shown in FIG. 3 , where all barrier elements 304 are selected to be non-blocking.
- barrier element array 210 functions as an “all pass” filter to substantially pass all of light 252 ( FIG. 2A ) or light 238 ( FIG. 2B ) as filtered light 110 to deliver the two-dimensional image generated by pixel array 208 to viewing space 106 , to be viewable as a two-dimensional image in a similar fashion as a conventional display.
- FIG. 13 shows a step 1302 that may be performed in step 606 of flowchart 600 ( FIG. 6 ) to provide a second or subsequent parallax barrier configuration, according to example embodiments.
- step 1302 at least one of a distance between adjacent non-blocking slits of the plurality of parallel non-blocking slits or a width of at least one non-blocking slit of the plurality of parallel non-blocking slits is modified. For example, referring to FIGS.
- a distance between adjacent non-blocking strips 802 may be modified and/or a width of one or more non-blocking strips 802 may be modified.
- These and/or further parallax barrier parameters may be configured in any number of ways to create multiple additional parallax barrier configurations that each have a corresponding set of the barrier elements in the blocking state and a corresponding set of barrier elements in the non-blocking state to support a viewer located at any number of corresponding positions.
- FIG. 14 shows a view of parallax barrier 300 of FIG. 3 , according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips 1402 a - 1402 e.
- parallel non-blocking strips 1402 a - 1402 e are alternated with parallel blocking strips 1404 a - 1404 f of barrier elements 304 that are selected to be blocking.
- FIG. 14 shows a view of parallax barrier 300 of FIG. 3 , according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non
- non-blocking strips 1402 a - 1402 e each have a width (along the x-dimension) of two barrier elements 304
- blocking strips 1404 a - 1404 f each have a width of three barrier elements 304 .
- FIGS. 8A and 8B where blocking strips 804 a - 804 g each have a width of two barrier elements 304 , blocking strips 1404 a - 1404 g have been modified to be wider to form another parallax barrier configuration.
- blocking strips may be modified to be wider or narrower by any desired number of barrier elements 304 , including a single barrier element (as in FIG. 14 versus FIG. 8A ) or multiple barrier elements, including tens, hundreds, or even further numbers of barrier elements.
- a width of the blocking strips may be modified for various reasons. For example, the width of the blocking strips may be modified to be wider to reduce a resolution and/or an intensity of the display image(s), to increase a distance at which views are delivered, and/or to modify lateral positions of delivered views. Alternatively, the width of the blocking strips may be modified to be narrower to increase a resolution and/or an intensity of the display image(s), to decrease a distance at which views are delivered, and/or to modify lateral positions of delivered views.
- FIG. 15 shows a display system 1500 , according to an example embodiment.
- System 1500 is generally similar to system 700 of FIG. 7 , with differences described as follows.
- system 1500 includes a pixel array 1502 and a barrier element array 1504 .
- System 1500 may also include display controller 202 of FIG. 2 , which is not shown in FIG. 15 for ease of illustration.
- Pixel array 1502 includes a first set of pixels 1514 a - 1514 d and a second set of pixels 1516 a - 1516 d.
- First set of pixels 1514 a - 1514 d and second set of pixels 1516 a - 1516 d are configured to generate corresponding images or views that can be combined to be perceived as a single three-dimensional image or view.
- Pixels of the two sets of pixels are alternated in pixel array 1502 in the order of pixel 1514 a, pixel 1516 a, pixel 1514 b, pixel 1516 b, etc. Further pixels may be included in each set of pixels in pixel array 1502 that are not visible in FIG. 15 , including hundreds, thousands, or millions of pixels in each set of pixels.
- barrier element array 1504 includes barrier elements that are each either transparent or opaque. As shown in FIG. 15 , barrier elements that are blocking are indicated as barrier elements 1510 a - 1510 f, and barrier elements that are non-blocking are indicated as barrier elements 1512 a - 1512 e. Blocking barrier elements 1510 are alternated with non-blocking barrier elements 1512 to form a plurality of parallel non-blocking slits in barrier element array 1504 , similarly to barrier element array 304 shown in FIG. 8A . Light emanating from pixel array 1502 is filtered by barrier element array 1504 to form first and second images 1506 a and 1506 b at locations 1508 a and 1508 b , respectively, in a manner as described above.
- barrier elements 1512 a - 1512 e are each wider relative to barrier elements 710 a - 710 f of FIG. 7 , while a spacing of pixels 1514 a - 1514 d is similar to the spacing of pixels 714 a - 714 d in FIG. 7 .
- a distance 1524 at which first and second images 1506 a and 1506 b are formed from pixel array 1502 is greater than distance 728 at which first and second images 706 a and 706 b are formed from pixel array 702 in FIG. 7 . In this manner, if user 1104 ( FIG.
- the three-dimensional view may still be delivered to user 1104 by reconfiguring parallax barrier 704 from a first configuration to a second configuration. Configurations of parallax barrier 704 may enable views to be delivered to user 1104 at lesser and greater distances than distance 728 .
- Equation 2 shown above may be rewritten as Equation 3 shown below to solve for distance 1004 in FIG. 10 as factor of spacing 722 :
- distance 1004 (distance 1006 ⁇ distance 1012)/(distance 1006 ⁇ spacing 722) Equation 3
- a width of one or more non-blocking slits in a barrier element array may be modified.
- FIG. 16 shows a view of parallax barrier 300 of FIG. 3 with a different width of non-blocking slits, according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- Barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips 1602 .
- FIG. 16 shows a view of parallax barrier 300 of FIG. 3 with a different width of non-blocking slits, according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- Barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non-
- non-blocking strips 1602 are alternated with parallel blocking strips 1604 of barrier elements 304 .
- non-blocking strips 1602 each have a width (along the x-dimension) of one barrier element 304
- blocking strips 1604 each have a width of one barrier element 304 .
- a width of non-blocking slits in a barrier element may be modified.
- the width of the non-blocking slits may be modified to have any width of one or more barrier elements 304 .
- the widths of non-blocking slits may be widened or narrowed for various reasons, including decreasing or increasing display resolution, decreasing or increasing clarity of images generated by one or more portions of the barrier element array, etc.
- parallel non-blocking slits may be implemented in a barrier element array to generate three-dimensional images.
- the slits are oriented such that an axis that crosses through both eyes of a user (e.g., user 1104 in FIG. 11 ) is perpendicular to an axis along the length of the non-blocking slits.
- a user sitting or standing in a viewing space sits or stands such that their body is generally aligned parallel to the non-blocking slits.
- an orientation of the non-blocking slits of a barrier element array may be selected to be aligned with the body of a user.
- orientation of non-blocking slits of a barrier element array may be selected on a section-by-section of the barrier element array basis.
- Each section of the barrier element array may include non-blocking slits that are aligned with a corresponding user to provide a three-dimensional image to that user.
- FIG. 17 shows a step 1702 that may be performed during flowchart 600 , according to example embodiments.
- each non-blocking slit of the plurality of parallel non-blocking slits is oriented at a selected angle relative to an axis of the barrier element array.
- FIGS. 18 and 19 show views of parallax barrier 300 of FIG. 3 with non-blocking slits having alternative orientations, according to an example embodiment.
- parallax barrier 300 includes barrier element array 302 , which includes a plurality of barrier elements 304 arranged in a two-dimensional array.
- Barrier element array 302 includes a plurality of parallel strips of barrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips 1802 (each having a width of one barrier elements 304 ). As shown in FIG. 18 , parallel non-blocking strips 1802 are alternated with parallel blocking strips 1804 of barrier elements 304 (each having a width of two barrier elements 304 ). Parallel non-blocking strips 1802 are oriented in a first direction along a horizontal axis of barrier element array 302 .
- parallel non-blocking strips 802 are oriented vertically, and thus may be configured to generate a three-dimensional image in a viewing space (as described above) to be viewable by a user whose body is oriented vertically (e.g., sitting upright or standing up).
- parallel non-blocking strips 1802 are oriented perpendicularly to parallel non-blocking strips 802 of FIGS. 8A and 8B .
- parallel non-blocking strips 1802 may be configured to generate a three-dimensional image in a viewing space (as described above) to be viewable by a user whose body is oriented horizontally (e.g., laying down). In this manner, users who are oriented differently relative to each other can still each be provided with a corresponding three-dimensional image that accommodates their position.
- barrier element array 304 may enable three-dimensional images of any orientation to be provided, including any angle between horizontal and vertical, by providing parallel non-blocking strips in barrier element array 302 of the desired angle (and by providing corresponding pixels in the pixel array arranged according to the desired angle).
- FIG. 19 shows parallax barrier 300 , with barrier element array 302 including a plurality of parallel non-blocking strips 1902 (each having a width of one barrier element 304 ). As shown in FIG.
- parallel non-blocking strips 1902 are alternated with parallel blocking strips 1904 of barrier elements 304 (each having a width of five barrier elements 304 ).
- Parallel non-blocking strips 1902 are oriented at an acute angle 1906 (an angle between zero and 90 degrees) relative to the horizontal axis 1908 of barrier element array 302 .
- angle 1906 may have any value, to enable a user oriented at substantially the same angle to be provided with a corresponding three-dimensional image that accommodates their position, according to a corresponding parallax barrier configuration.
- parallax barriers may be reconfigured to change the locations of delivered views based on changing viewer positions.
- a position of a viewer may be determined/tracked so that a parallax barrier may be reconfigured to deliver views consistent with the changing position of the viewer.
- a position of a viewer may be determined/tracked by determining a position of the viewer directly, or by determining a position of a device associated with the viewer (e.g., a device worn by the viewer, held by the viewer, sitting in the viewer's lap, in the viewer's pocket, sitting next the viewer, etc.).
- FIG. 20 shows a block diagram of a display environment 2000 , according to an example embodiment.
- display environment 2000 includes a display device 2002 , a remote device 2004 , and a viewer 2006 .
- Display device 2002 is an example of display system 112 of FIG. 1 , and may be configured similarly to display device 250 ( FIG. 2A ) or display device 260 ( FIG. 2B ) in embodiments.
- Viewer 2006 is delivered a three-dimensional view 2008 by display device 2002 (display device 2002 may optionally also deliver a two-dimensional view to viewer 2006 ).
- Remote device 2004 is a device that viewer 2006 may use to interact with display device 2002 .
- remote device 2004 may be a remote control, a headset, game controller, a smart phone, or other device.
- Display device 2002 and/or remote device 2004 may operate to provide position information 2010 regarding user 2006 to display device 2002 .
- Display device 2002 may use position information 2010 to reconfigure a parallax barrier of display device 2002 to enable view 2008 to be delivered to viewer 2006 at various positions for viewer 2006 .
- display device 2002 and/or remote device 2004 may use positioning techniques to track the position of viewer 2006 .
- Remote device 2004 may be configured in various ways to enable the position of viewer 2006 to be tracked.
- FIG. 21 shows a block diagram of remote device 2004 , according to an example embodiment.
- remote device 2004 may include a transmitter 2102 , a positioning module 2104 , a position calculator 2106 , a user interface module 2108 , one or more camera(s) 2110 , and an image processing system 2112 .
- Remote device 2004 may include one or more of these elements shown in FIG. 21 , depending on the particular embodiment. These elements of remote device 2004 are described as follows.
- Positioning module 2104 may be included in remote device 2004 to determine a position of remote device 2004 according to a positioning technique, such triangulation or trilateration.
- positioning module 2104 may include one or more receivers that receive satellite broadcast signals (e.g., a global positioning system (GPS) module that receives signals from GPS satellites).
- Position calculator 2106 may calculate the position of remote device 2004 by precisely timing the received signals according to GPS techniques.
- positioning module 2104 may include one or more receivers that receive signals transmitted by display device 2002 that are used by position calculator 2106 to calculate the position of remote device 2004 .
- positioning module 2104 and position calculator 2106 may implement other types of positioning techniques.
- User interface module 2108 may be present to enable viewer 2006 to interact with remote device 2004 .
- user interface module 2108 may include any number and combination of user interface elements, such as a keyboard, a thumb wheel, a pointing device, a roller ball, a stick pointer, a joystick, a thumb pad, a display, a touch sensitive display, any number of virtual interface elements, a voice recognition system, a haptic interface, and/or other user interface elements described elsewhere herein or otherwise known.
- User interface module 2108 may be configured to enable viewer 2006 to manually enter position information for viewer 2006 into remote device 2004 , including manually entering coordinates of viewer 2006 in viewing space 106 , entering an indication of a predetermined location in viewing space 106 into remote device 2004 (e.g., a “location A”, a “seat D,” etc.), or providing position information in any other manner.
- Camera(s) 2110 may be present in remote device 2004 to enable optical position detection of viewer 2006 .
- camera(s) 2110 may be pointed by viewer 2006 at display device 2002 , which may display a symbol or code, and one or more images of the displayed symbol or code may be captured by camera(s) 2110 .
- Image processing system 2112 may receive the captured image(s), and determine a position of remote device 2004 relative to display device 2002 based on the captured image(s).
- camera(s) 2110 may include a pair of cameras, and image processing system 2112 may perform dual image processing to determine the position of remote device 2004 relative to display device 2002 .
- Position information 2010 is configured to transmit position information 2010 to display device 2002 from remote device 2004 .
- Position information 2010 may include a determined position for remote device 2004 (e.g., calculated by position calculator 2106 or image processing system 2112 ), and/or may include captured data (e.g., received signal data received by positioning module 2104 , images captured by camera(s) 2110 , etc.) so that display device 2002 may determine the position of remote device 2004 based on the captured data.
- Display device 2002 may have any form, such as any one or more of a display or monitor, a game console, a set top box, a stereo receiver, a computer, any other display device mentioned elsewhere herein or otherwise known, or any combination of such devices.
- Display device 2002 may be configured in various ways to enable the position of viewer 2006 to be tracked.
- FIG. 22 shows a block diagram of display device 2002 , according to an example embodiment.
- display device 2002 may include a position determiner module 2214 configured to determine a position of one or more viewers.
- Position determiner module 2214 may include a receiver 2202 , one or more transmitter(s) 2204 , a position calculator 2206 , a microphone array 2208 , one or more camera(s) 2210 , and an image processing system 2112 . Position determiner module 2214 may include one or more of these elements, depending on the particular embodiment. As shown in FIG. 22 , position determiner module 2214 generates position information 2216 based on one or more of receiver 2202 , transmitter(s) 2204 , position calculator 2206 , microphone array 2208 , camera(s) 2210 , and image processing system 2112 .
- Position information 2216 may be received by display controller 2002 , and used by display controller 2002 to adapt display device 2002 (e.g., adapting one or more of parallax barrier 104 , pixel array 114 , and/or backlighting 116 of FIG. 1 according to corresponding control signals) to deliver views to viewer 2006 as viewer 2006 may reposition within a viewing space.
- display controller 2002 uses display controller 2002 to adapt display device 2002 (e.g., adapting one or more of parallax barrier 104 , pixel array 114 , and/or backlighting 116 of FIG. 1 according to corresponding control signals) to deliver views to viewer 2006 as viewer 2006 may reposition within a viewing space.
- microphone array 2208 includes one or more microphones that may be positioned in various microphone locations in and/or around display device 2002 to capture sounds (e.g., voice) from viewer 2006 .
- Microphone array 2208 produces signals representative of the received sounds, which may be received by position calculator 2206 .
- Position calculator 2206 may be configured to use the received signals to determine the location of viewer 2006 .
- position calculator 2206 may use voice recognition techniques to determine that the sounds are received from viewer 2006 , and may perform audio localization techniques to determine a position of viewer 2006 based on the sounds.
- Camera(s) 2210 may be present in display device 2002 to enable optical position detection of viewer 2006 .
- camera(s) 2210 may be pointed from display device 2002 to viewing space 106 to capture images of viewer 2006 and/or remote device 2004 .
- Viewer 2006 and/or remote device 2004 may optionally display a symbol or code, and the displayed symbol or code may be captured in the images.
- Image processing system 2212 may receive the captured image(s), and determine a position of viewer 2006 and/or remote device 2004 relative to display device 2002 based on the captured image(s) (e.g., using facial recognition, image processing of the symbol or code, etc.).
- camera(s) 2210 may include a pair of cameras, and image processing system 2212 may perform dual image processing to determine the position of viewer 2006 and/or remote device 2004 relative to display device 2002 .
- transmitter(s) may be configured to transmit signals that may be received by positioning module 2104 to determine a position of remote device 2004 , as described above with respect to FIG. 21 .
- Receiver 2202 may be configured to receive position information 2010 from remote device 2004 .
- position information 2010 may include a determined position for remote device 2004 and/or may include captured data (e.g., received signal data, images, etc.).
- Display device 2002 may determine the position of remote device 2004 based on the captured data.
- position calculator 2106 may determine a position of remote device 2004 based on the signal data received by positioning module 2104 at remote device 2004 .
- image processing system 2112 may determine a position of remote device 2004 based on the images captured by camera(s) 2210 at remote device 2004 .
- Display controller 202 , pixel array controller 204 , barrier array controller 206 , pixel array controller 228 , light source controller 230 , slit spacing calculator 902 , positioning module 2104 , position calculator 2106 , image processing system 2112 , position determiner module 2214 , position calculator 2206 , and image processing system 2212 may be implemented in hardware, software, firmware, or any combination thereof.
- display controller 202 may be implemented as computer program code configured to be executed in one or more processors.
- pixel array controller 204 may be implemented as computer program code configured to be executed in one or more processors.
- barrier array controller 206 may be implemented as pixel array controller 228 , light source controller 230 , slit spacing calculator 902 , positioning module 2104 , position calculator 2106 , image processing system 2112 , position determiner module 2214 , position calculator 2206 , and/or image processing system 2212 may be implemented as computer program code configured to be executed in one or more processors.
- display controller 202 may be implemented as hardware logic/electrical circuitry.
- FIG. 23 shows a block diagram of an example implementation of display controller 202 , according to an embodiment.
- display controller 202 may include one or more of the elements shown in FIG. 23 .
- display controller 202 may include one or more processors (also called central processing units, or CPUs), such as a processor 2304 .
- processors also called central processing units, or CPUs
- Processor 2304 is connected to a communication infrastructure 2302 , such as a communication bus.
- processor 2304 can simultaneously operate multiple computing threads.
- Display controller 202 also includes a primary or main memory 2306 , such as random access memory (RAM).
- Main memory 2306 has stored therein control logic 2328 A (computer software), and data.
- Display controller 202 also includes one or more secondary storage devices 2310 .
- Secondary storage devices 2310 include, for example, a hard disk drive 2312 and/or a removable storage device or drive 2314 , as well as other types of storage devices, such as memory cards and memory sticks.
- display controller 202 may include an industry standard interface, such a universal serial bus (USB) interface for interfacing with devices such as a memory stick.
- Removable storage drive 2314 represents a floppy disk drive, a magnetic tape drive, a compact disk drive, an optical storage device, tape backup, etc.
- Removable storage drive 2314 interacts with a removable storage unit 2316 .
- Removable storage unit 2316 includes a computer useable or readable storage medium 2324 having stored therein computer software 2328 B (control logic) and/or data.
- Removable storage unit 2316 represents a floppy disk, magnetic tape, compact disk, DVD, optical storage disk, or any other computer data storage device.
- Removable storage drive 2314 reads from and/or writes to removable storage unit 2316 in a well known manner.
- Display controller 202 further includes a communication or network interface 2318 .
- Communication interface 2318 enables the display controller 202 to communicate with remote devices.
- communication interface 2318 allows display controller 202 to communicate over communication networks or mediums 2342 (representing a form of a computer useable or readable medium), such as LANs, WANs, the Internet, etc.
- Network interface 2318 may interface with remote sites or networks via wired or wireless connections.
- Control logic 2328 C may be transmitted to and from display controller 202 via the communication medium 2342 .
- Any apparatus or manufacture comprising a computer useable or readable medium having control logic (software) stored therein is referred to herein as a computer program product or program storage device.
- Devices in which embodiments may be implemented may include storage, such as storage drives, memory devices, and further types of computer-readable media.
- Examples of such computer-readable storage media include a hard disk, a removable magnetic disk, a removable optical disk, flash memory cards, digital video disks, random access memories (RAMs), read only memories (ROM), and the like.
- computer program medium and “computer-readable medium” are used to generally refer to the hard disk associated with a hard disk drive, a removable magnetic disk, a removable optical disk (e.g., CDROMs, DVDs, etc.), zip disks, tapes, magnetic storage devices, MEMS (micro-electromechanical systems) storage, nanotechnology-based storage devices, as well as other media such as flash memory cards, digital video discs, RAM devices, ROM devices, and the like.
- Such computer-readable storage media may store program modules that include computer program logic for display controller 202 , pixel array controller 204 , barrier array controller 206 , pixel array controller 228 , light source controller 230 , slit spacing calculator 902 , positioning module 2104 , position calculator 2106 , image processing system 2112 , position determiner module 2214 , position calculator 2206 , image processing system 2212 , flowchart 600 , step 1202 , step 1302 , step 1702 (including any one or more steps of flowchart 600 ), and/or further embodiments of the present invention described herein.
- Embodiments of the invention are directed to computer program products comprising such logic (e.g., in the form of program code or software) stored on any computer useable medium.
- Such program code when executed in one or more processors, causes a device to operate as described herein.
- the invention can work with software, hardware, and/or operating system implementations other than those described herein. Any software, hardware, and operating system implementations suitable for performing the functions described herein can be used.
- display controller 202 may be implemented in association with a variety of types of display devices. Such display devices may be implemented in or in association with a variety of types of media devices, such as a stand-alone display (e.g., a television display such as flat panel display, etc.), a computer, a game console, a set top box, a digital video recorder (DVR), etc.
- Media content that is delivered in two-dimensional or three-dimensional form according to embodiments described herein may be stored locally or received from remote locations. For instance, such media content may be locally stored for playback (replay TV, DVR), may be stored in removable memory (e.g.
- FIG. 23 shows a first media content 2330 A that is stored in hard disk drive 2312 , a second media content 2330 B that is stored in storage medium 2324 of removable storage unit 2316 , and a third media content 2330 C that may be remotely stored and received over communication medium 2322 by communication interface 2318 .
- Media content 2330 may be stored and/or received in these manners and/or in other ways.
Abstract
Description
- This application claims the benefit of U.S. Provisional Application No. 61/291,818, filed on Dec. 31, 2009, which is incorporated by reference herein in its entirety; and
- This application claims the benefit of U.S. Provisional Application No. 61/303,119, filed on Feb. 10, 2010, which is incorporated by reference herein in its entirety.
- 1. Field of the Invention
- The present invention relates to three-dimensional image displays.
- 2. Background Art
- Images may be generated for display in various forms. For instance, television (TV) is a widely used telecommunication medium for transmitting and displaying images in monochromatic (“black and white”) or color form. Conventionally, images are provided in analog form and are displayed by display devices in two-dimensions. More recently, images are being provided in digital form for display in two-dimensions on display devices having improved resolution (e.g., “high definition” or “HD”). Even more recently, images capable of being displayed in three-dimensions are being generated.
- Conventional displays may use a variety of techniques to achieve three-dimensional image viewing functionality. For example, various types of glasses have been developed that may be worn by users to view three-dimensional images displayed by a conventional display. Examples of such glasses include glasses that utilize color filters or polarized filters. In each case, the lenses of the glasses pass two-dimensional images of differing perspective to the user's left and right eyes. The images are combined in the visual center of the brain of the user to be perceived as a three-dimensional image. In another example, synchronized left eye, right eye LCD (liquid crystal display) shutter glasses may be used with conventional two-dimensional displays to create a three-dimensional viewing illusion. In still another example, LCD display glasses are being used to display three-dimensional images to a user. The lenses of the LCD display glasses include corresponding displays that provide images of differing perspective to the user's eyes, to be perceived by the user as three-dimensional.
- Problems exist with such techniques for viewing three-dimensional images. For instance, persons that use such displays and systems to view three-dimensional images may suffer from headaches, eyestrain, and/or nausea after long exposure. Furthermore, some content, such as two-dimensional text, may be more difficult to read and interpret when displayed three-dimensionally. To address these problems, some manufacturers have created display devices that may be toggled between three-dimensional viewing and two-dimensional viewing. A display device of this type may be switched to a three-dimensional mode for viewing of three-dimensional images, and may be switched to a two-dimensional mode for viewing of two-dimensional images (and/or to provide a respite from the viewing of three-dimensional images).
- A parallax barrier is another example of a device that enables images to be displayed in three-dimensions. A parallax barrier includes of a layer of material with a series of precision slits. The parallax barrier is placed proximal to a display so that a user's eyes each see a different set of pixels to create a sense of depth through parallax. A disadvantage of parallax barriers is that the viewer must be positioned in a well-defined location in order to experience the three-dimensional effect. If the viewer moves his/her eyes away from this “sweet spot,” image flipping and/or exacerbation of the eyestrain, headaches and nausea that may be associated with prolonged three-dimensional image viewing may result. Conventional three-dimensional displays that utilize parallax barriers are also constrained in that the displays must be entirely in a two-dimensional image mode or a three-dimensional image mode at any time.
- Methods, systems, and apparatuses are described for displays having adaptable parallax barriers substantially as shown in and/or described herein in connection with at least one of the figures, as set forth more completely in the claims.
- The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the invention.
-
FIG. 1 shows a block diagram of a display system, according to an example embodiment. -
FIGS. 2A and 2B show block diagrams of examples of the display system ofFIG. 1 , according to embodiments. -
FIG. 3 shows a view of a surface of a parallax barrier, according to an example embodiment. -
FIGS. 4 and 5 show views of a barrier element of a barrier element array that is selected to be transparent and to be opaque, respectively, according to example embodiments. -
FIG. 6 shows a flowchart for generating three-dimensional images, according to an example embodiment. -
FIG. 7 shows a cross-sectional view of an example of a display system, according to an embodiment. -
FIGS. 8A and 8B shows view of example parallax barriers with non-blocking slits, according to embodiments. -
FIG. 9 shows a block diagram of a barrier array controller, according to an example embodiment. -
FIG. 10 shows an example display system configured to generate three-dimensional images, according to an example embodiment. -
FIG. 11 shows the display system ofFIG. 7 providing a three-dimensional image to a user, according to an example embodiment. -
FIG. 12 shows a process for forming a two-dimensional image, according to an example embodiment. -
FIG. 13 shows a process for modifying a parallax barrier to modify display characteristics, according to example embodiments. -
FIG. 14 shows a view of the parallax barrier ofFIG. 3 with increased spacing between non-blocking slits, according to an example embodiment. -
FIG. 15 shows a display system with increased spacing between non-blocking slits, according to an example embodiment. -
FIG. 16 shows a view of the parallax barrier ofFIG. 3 with alternative width non-blocking slits, according to an example embodiment. -
FIG. 17 shows a process for configuring a parallax barrier to display differently oriented three-dimensional images, according to example embodiments. -
FIGS. 18 and 19 show views of the parallax barrier ofFIG. 3 with alternatively oriented non-blocking slits, according to an example embodiment. -
FIG. 20 shows a block diagram of a display environment, according to an example embodiment. -
FIG. 21 shows a block diagram of a remote device, according to an example embodiment. -
FIG. 22 shows a block diagram of a display device, according to an example embodiment. -
FIG. 23 shows a block diagram of an example display controller, according to an embodiment. - The present invention will now be described with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Additionally, the left-most digit(s) of a reference number identifies the drawing in which the reference number first appears.
- The present specification discloses one or more embodiments that incorporate the features of the invention. The disclosed embodiment(s) merely exemplify the invention. The scope of the invention is not limited to the disclosed embodiment(s). The invention is defined by the claims appended hereto.
- References in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
- Furthermore, it should be understood that spatial descriptions (e.g., “above,” “below,” “up,” “left,” “right,” “down,” “top,” “bottom,” “vertical,” “horizontal,” etc.) used herein are for purposes of illustration only, and that practical implementations of the structures described herein can be spatially arranged in any orientation or manner.
- Embodiments of the present invention relate to display devices that include a parallax barrier that may be dynamically modified, thereby changing the manner in which images are delivered to the eyes of one or more viewers. The parallax barrier may be configured to enable the adaptive display of multiple types of images to users. For instance, embodiments enable the adaptive accommodation of a changing viewer sweet spot, and switching between two-dimensional (2D) and stereoscopic three-dimensional (3D) images. Example features of the parallax barrier that may be dynamically modified include one or more of a number of slits in the parallax barrier, the dimensions of each slit, the spacing between the slits, and the orientation of the slits.
- The following subsections describe numerous example embodiments of the present invention. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made to the embodiments described herein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of exemplary embodiments described herein.
- A. Example Display System and Method Embodiments
- In embodiments, a display device may include an adaptive parallax barrier to enable various display capabilities. For instance,
FIG. 1 shows a block diagram of adisplay system 100, according to an example embodiment. As shown inFIG. 1 ,system 100 includes adisplay device 112.Display device 112 is capable of displaying 2D and 3D images as described above. As shown inFIG. 1 ,display device 112 includes aimage generator 102 and aparallax barrier 104. Furthermore, as shown inFIG. 1 ,image generator 102 includes apixel array 114 and may optionally includebacklighting 116.Image generator 102 andparallax barrier 104 operate to generate 2D and/or 3D images that are viewable by users/viewers in aviewing space 106. Althoughparallax barrier 104 is shown positioned betweenimage generator 102 andviewing space 106 inFIG. 1 , as further described below,parallax barrier 104 may alternatively be positioned between portions of image generator 102 (e.g., betweenpixel array 114 and backlighting 116). - When present, backlighting 116 emits light that is filtered by
parallax barrier 104, and the filtered light is received bypixel array 114, which imposes image information on the filtered light by performing further filtering. When backlighting 116 is not present,pixel array 114 may be configured to emit light which includes the image information, and the light is filtered byparallax barrier 104.Parallax barrier 104 operates as an image filter or “light manipulator” to filter received light with a plurality of barrier elements (also referred to as “blocking regions”) that are selectively substantially opaque or transparent to generate three-dimensional images from the image information provided bypixel array 114. The image information may include one or more still images, motion (e.g., video) images, etc. As shown inFIG. 1 ,image generator 102 andparallax barrier 104 generate filteredlight 110. Filtered light 110 may include a two-dimensional image or a three-dimensional image (e.g., formed by a pair of two-dimensional images in filtered light 110), for instance. Filtered light 110 is received inviewing space 106 proximate to displaydevice 112. One or more users may be present inviewing space 106 to view the images included in filteredlight 110. -
Display device 112 may be implemented in various ways. For instance,display device 112 may be a television display (e.g., an LCD (liquid crystal display) television, a plasma television, etc.), a computer monitor, or any other type of display device.Image generator 102 may be any suitable type or combination of light and image generating devices, including an LCD screen, a plasma screen, an LED (light emitting device) screen (e.g., an OLED (organic LED) screen), etc.Parallax barrier 104 may be any suitable light filtering device, including an LCD filter, a mechanical filter (e.g., that incorporates individually controllable shutters), etc., and may be configured in any manner, including as a thin-film device (e.g., formed of a stack of thin film layers), etc. Backlighting 116 may be any suitable light emitting device, including a panel of LEDs or other light emitting elements. -
FIG. 2A shows a block diagram of adisplay system 200, which is an example ofsystem 100 shown inFIG. 1 , according to an embodiment. As shown inFIG. 2A ,system 200 includes adisplay device controller 202 and a display device 250 (which includesimage generator 102 and parallax barrier 104).Display device 250 is an example ofdisplay device 112 inFIG. 1 . As shown inFIG. 2A ,image generator 102 includes a pixel array 208 (which is an example ofpixel array 114 ofFIG. 1 ), andparallax barrier 104 includes abarrier element array 210. Furthermore, as shown inFIG. 2A ,display controller 202 includes apixel array controller 204 and abarrier array controller 206. These features ofsystem 200 are described as follows. -
Pixel array 208 includes a two-dimensional array of pixels (e.g., arranged in a grid or other distribution).Pixel array 208 is a self-illuminating or light-generating pixel array such that the pixels ofpixel array 208 each emit light included in light 252 emitted fromimage generator 102. Each pixel may be a separately addressable light source (e.g., a pixel of a plasma display, an LCD display, an LED display such as an OLED display, or of other type of display). Each pixel ofpixel array 208 may be individually controllable to vary color and intensity. In an embodiment, each pixel ofpixel array 208 may include a plurality of sub-pixels that correspond to separate color channels, such as a trio of red, green, and blue sub-pixels included in each pixel. -
Parallax barrier 104 is positioned proximate to a surface ofpixel array 208.Barrier element array 210 is a layer ofparallax barrier 104 that includes a plurality of barrier elements or blocking regions arranged in an array. Each barrier element of the array is configured to be selectively opaque or transparent. For instance,FIG. 3 shows aparallax barrier 300, according to an example embodiment.Parallax barrier 300 is an example ofparallax barrier 104 ofFIG. 2A . As shown inFIG. 3 ,parallax barrier 300 includes abarrier element array 302.Barrier element array 302 includes a plurality ofbarrier elements 304 arranged in a two-dimensional array (e.g., arranged in a grid), although in other embodiments, may includebarrier elements 304 arranged in other ways.Barrier elements 304 may each be a pixel of an LCD, a moveable mechanical element (e.g., a hinged flap that passes light in a first position and blocks light in a second position), a magnetically actuated element, or other suitable barrier element. Eachbarrier element 304 is shown inFIG. 3 as rectangular (e.g., square) in shape, but in other embodiments may have other shapes. - For example, in one embodiment, each
barrier element 304 may have a “band” shape that extends a vertical length ofbarrier element array 302, such thatbarrier element array 302 includes a single horizontal row ofbarrier elements 304. Eachbarrier element 304 may include one or more of such bands, and different portions ofbarrier element array 302 may includebarrier elements 304 that include different numbers of such bands. One advantage of such a configuration is thatbarrier elements 304 extending a vertical length ofbarrier element array 302 do not need to have spacing between them because there is no need for drive signal routing in such space. For instance, in a two-dimensional LCD array configuration, such as TFT (thin film transistor) display, a transistor-plus-capacitor circuit is typically placed onsite at the corner of a single pixel in the array, and control signals for such transistors are routed between the LCD pixels (row-column control, for example). In a pixel configuration for a parallax barrier, local transistor control may not be necessary becausebarrier elements 304 may not need to be changing as rapidly as display pixels (e.g., pixels of pixel array 208). For a single row of vertical bands ofbarrier elements 304, control signals may be routed to the top and/or bottom ofbarrier elements 304. Because in such a configuration control signal routing between rows is not needed, the vertical bands can be arranged side-by-side with little-to-no space in between. Thus, if the vertical bands are thin and oriented edge-to-edge, one band or multiple adjacent bands (e.g., five bands) in a row may comprise abarrier element 304 in a blocking state, followed by one band or multiple adjacent bands (e.g., two bands) that comprise abarrier element 304 in a non-blocking state (a slit), and so on. In the example of five bands in a blocking state and two bands in a non-blocking state, the five bands may combine to offer a single black barrier element of approximately 2.5 times the width of a single transparent slit with no spaces therein. -
Barrier element array 302 may include any number ofbarrier elements 304. For example, inFIG. 3 ,barrier element array 302 includes twenty-eightbarrier elements 304 along an x-axis and includes twentybarrier elements 304 along a y-axis, for a total number of five hundred and sixtybarrier elements 304. However, these dimensions ofbarrier element array 302 and the total number ofbarrier elements 304 forbarrier element array 302 shown inFIG. 3 are provided for illustrative purposes, and are not intended to be limiting.Barrier element array 302 may include any number ofbarrier elements 304, and may have any array dimensions, including ones, tens, hundreds, thousands, or even larger numbers ofbarrier elements 304 along each of the x- and y-axes.Barrier element array 302 ofFIG. 3 is merely illustrative of larger barrier arrays that may be typically present in embodiments ofparallax barrier 104. In embodiments, the width of one barrier element in a barrier element array may be a multiple or divisor of a corresponding display pixel width (e.g., a width of a pixel of pixel array 114). Similarly, a number of columns/rows in a barrier element array may be a multiple or divisor of a corresponding number of columns/rows of pixels in a corresponding pixel array. - Each
barrier element 304 ofbarrier element array 302 is selectable to be substantially opaque or transparent. For instance,FIG. 4 shows abarrier element 304 x that is selected to be substantially transparent, andFIG. 5 showsbarrier element 304 x when selected to be substantially opaque, according to example embodiments. Whenbarrier element 304 x is selected to be transparent, light 252 frompixel array 208 may pass throughbarrier element 304 x (e.g., to viewing space 106). Whenbarrier element 304 x is selected to be opaque, light 252 frompixel array 208 is blocked from passing throughbarrier element 304 x. By selecting some ofbarrier elements 304 ofbarrier element array 302 to be transparent, and some ofbarrier elements 304 ofbarrier element array 302 to be opaque, light 252 received atbarrier element array 302 is filtered to generate filteredlight 110. It is noted that in some embodiments, barrier elements may capable of being completely transparent or opaque, and in other embodiments, barrier elements may not be capable of being fully transparent or opaque. For instance, such barrier elements may be capable of being 95% transparent when considered to be “transparent” and may be capable of being 5% transparent when considered to be “opaque.” “Transparent” and “opaque” as used herein are intended to encompass barrier elements being substantially transparent (e.g., greater than 75% transparent, including completely transparent) and substantially opaque (e.g., less than 25% transparent, including completely opaque), respectively. -
Display controller 202 is configured to generate control signals to enabledisplay device 250 to display two-dimensional and three-dimensional images tousers 218 inviewing space 106. For example,pixel array controller 204 is configured to generate acontrol signal 214 that is received bypixel array 208.Control signal 214 may include one or more control signals used to cause pixels ofpixel array 208 to emit light 252 of particular desired colors and/or intensity.Barrier array controller 206 is configured to generate acontrol signal 216 that is received bybarrier element array 210.Control signal 216 may include one or more control signals used to cause each ofbarrier elements 304 ofbarrier element array 302 to be transparent or opaque. In this manner,barrier element array 210 filters light 252 to generate filtered light 110 that includes one or more two-dimensional and/or three-dimensional images that may be viewed byusers 218 inviewing space 106. - For example,
control signal 214 may control sets of pixels ofpixel array 208 to each emit light representative of a respective image, to provide a plurality of images.Control signal 216 may controlbarrier elements 304 ofbarrier element array 210 to filter the light received frompixel array 208 according to the provided images such that one or more of the images are received byusers 218 in two-dimensional form. For instance, in a first mode,control signal 216 may select thebarrier elements 304 ofbarrier element array 302 to be transparent, to transmit a two-dimensional image or view tousers 218. Furthermore, in a second mode,control signal 216 may control sections ofbarrier element array 210 to include opaque andtransparent barrier elements 304 to filter the light received frompixel array 208 so that a pair of images or views provided bypixel array 208 is received byusers 218 as a corresponding three-dimensional image or view. For example,control signal 216 may select parallel strips ofbarrier elements 304 ofbarrier element array 302 to be transparent to form slits that enable three-dimensional images to be received byusers 218. - In embodiments,
control signal 216 may be generated bybarrier array controller 206 to configure one or more characteristics ofbarrier element array 210. For example,control signal 216 may be generated to form any number of parallel strips ofbarrier elements 304 ofbarrier element array 302 to be transparent, to modify the number and/or spacing of parallel strips ofbarrier elements 304 ofbarrier element array 302 that are transparent, to select and/or modify a width and/or a length (in barrier elements 304) of one or more strips ofbarrier elements 304 ofbarrier element array 302 that are transparent or opaque, to select and/or modify an orientation of one or more strips ofbarrier elements 304 ofbarrier element array 302 that are transparent, etc. -
FIG. 2B shows a block diagram of adisplay system 220, which is another example ofsystem 100 shown inFIG. 1 , according to an embodiment. As shown inFIG. 2B ,system 220 includesdisplay device controller 202 and adisplay device 260, which includes apixel array 222,parallax barrier 104, andbacklighting 116.Display device 260 is an example ofdisplay device 112 inFIG. 1 . As shown inFIG. 2B ,parallax barrier 104 includesbarrier element array 210 andbacklighting 116 includes alight element array 236. Furthermore,display controller 202 includes apixel array controller 228,barrier array controller 206, and alight source controller 230. Although separated byparallax barrier 104 inFIG. 2B ,pixel array 222 andbacklighting 116 form an example ofimage generator 102 ofFIG. 1 . These features ofsystem 220 are described as follows. - Backlighting 116 is a backlight panel that emits light 238. Light element array 236 (or “backlight array”) of
backlighting 116 includes a two-dimensional array of light sources. Such light sources may be arranged, for example, in a rectangular grid. Each light source inlight element array 236 is individually addressable and controllable to select an amount of light emitted thereby. A single light source may comprise one or more light-emitting elements depending upon the implementation. In one embodiment, each light source inlight element array 236 comprises a single light-emitting diode (LED) although this example is not intended to be limiting. -
Parallax barrier 104 is positioned proximate to a surface of backlighting 116 (e.g., a surface of the backlight panel). As described above,barrier element array 210 is a layer ofparallax barrier 104 that includes a plurality of barrier elements or blocking regions arranged in an array. Each barrier element of the array is configured to be selectively opaque or transparent.FIG. 3 , as described above, shows aparallax barrier 300, which is an example ofparallax barrier 104 ofFIG. 2B .Barrier element array 210 filters light 238 received from backlighting 116 to generate filteredlight 240. Filtered light 240 is configured to enable a two-dimensional image or a three-dimensional image (e.g., formed by a pair of two-dimensional images in filtered light 110) to be formed based on images subsequently imposed on filtered light 240 bypixel array 222. - Similarly to
pixel array 208 ofFIG. 2A ,pixel array 222 ofFIG. 2B includes a two-dimensional array of pixels (e.g., arranged in a grid or other distribution). However,pixel array 222 is not self-illuminating, and instead is a light filter that imposes images (e.g., in the form of color, grayscale, etc.) on filtered light 240 fromparallax barrier 104 to generate filtered light 110 to include one or more images. Each pixel ofpixel array 222 may be a separately addressable filter (e.g., a pixel of a plasma display, an LCD display, an LED display, or of other type of display). Each pixel ofpixel array 208 may be individually controllable to vary the color imposed on the corresponding light passing through, and/or to vary the intensity of the passed light in filteredlight 110. In an embodiment, each pixel ofpixel array 222 may include a plurality of sub-pixels that correspond to separate color channels, such as a trio of red, green, and blue sub-pixels included in each pixel. -
Display controller 202 ofFIG. 2B is configured to generate control signals to enabledisplay device 260 to display two-dimensional and three-dimensional images tousers 218 inviewing space 106. For example,light source controller 230 withindisplay controller 202 controls the amount of light emitted by each light source inlight element array 236 by generating acontrol signal 234 that is received bylight element array 236.Control signal 234 may include one or more control signals used to control the amount of light emitted by each light source inlight element array 236 to generate light 238. As described above,barrier array controller 206 is configured to generate control signal 216 received bybarrier element array 210.Control signal 216 may include one or more control signals used to cause each ofbarrier elements 304 ofbarrier element array 302 to be transparent or opaque, to filter light 238 to generate filteredlight 240.Pixel array controller 228 is configured to generate acontrol signal 232 that is received bypixel array 222.Control signal 232 may include one or more control signals used to cause pixels ofpixel array 208 to impose desired images (e.g., colors, grayscale, etc.) on filtered light 240 as it passes throughpixel array 208. In this manner,pixel array 222 generates filtered light 110 that includes one or more two-dimensional and/or three-dimensional images that may be viewed byusers 218 inviewing space 106. - For example,
control signal 234 may control sets of light sources oflight element array 236 to emit light 238.Control signal 216 may controlbarrier elements 304 ofbarrier element array 210 to filter light 238 received fromlight element array 236 to enable filtered light 240 to enable two- and/or three-dimensionality.Control signal 232 may control sets of pixels ofpixel array 222 to filter filtered light 240 according to respective images, to provide a plurality of images. For instance, in a first mode,control signal 216 may select thebarrier elements 304 ofbarrier element array 302 to be transparent, to transmit a two-dimensional image tousers 218. Furthermore, in a second mode,control signal 216 may control sections ofbarrier element array 210 to include opaque andtransparent barrier elements 304 to filter the light received fromlight element array 236 so that a pair of images provided bypixel array 222 is received byusers 218 as a corresponding as three-dimensional image. For example,control signal 216 may select parallel strips ofbarrier elements 304 ofbarrier element array 302 to be transparent to form slits that enable three-dimensional images to be received byusers 218. - Two-dimensional and three-dimensional images may be generated by
system 100 ofFIG. 1 in various ways, in embodiments. For instance,FIG. 6 shows aflowchart 600 for generating images that are delivered to users in a viewing space, according to an example embodiment.Flowchart 600 may be performed bysystem 200 inFIG. 2A orsystem 220 ofFIG. 2B , for example.Flowchart 600 is described with respect toFIG. 7 , which shows a cross-sectional view of adisplay system 700.Display system 700 is an example embodiment ofsystem 200 shown inFIG. 2A , and is shown for purposes of illustration. As shown inFIG. 7 ,system 700 includes apixel array 702 and abarrier element array 704. In another embodiment,system 700 may further include backlighting in a configuration similar todisplay system 220 ofFIG. 2B . Further structural and operational embodiments will be apparent to persons skilled in the relevant art(s) based on thediscussion regarding flowchart 600.Flowchart 600 is described as follows. -
Flowchart 600 begins withstep 602. Instep 602, light is received at an array of barrier elements. For example, as shown inFIG. 2A , light 252 is received atparallax barrier 104 frompixel array 208 ofimage generator 102. Each pixel ofpixel array 208 may generate light that is received atparallax barrier 104. As described as follows, depending on the particular display mode ofparallax barrier 104,parallax barrier 104 may filter light 252 frompixel array 208 to generate a two-dimensional image or a three-dimensional image viewable inviewing space 106 byusers 218. As described above with respect toFIG. 2B , alternatively, light 238 may be received byparallax barrier 104 fromlight element array 236. - In
step 604, the array of barrier elements is configured into a first parallax barrier configuration that has a first set of the barrier elements of the array of barrier elements in the blocking state and a second set of the barrier elements of the array of barrier elements in the non-blocking state to provide the viewer located at a first position with a three-dimensional view. In a three-dimensional mode fordisplay system 100 ofFIG. 1 , a three-dimensional image may be desired to be viewable inviewing space 106. In such case, referring toFIG. 2A or 2B,barrier array controller 206 may generate control signal 216 to configurebarrier element array 210 to include transparent strips of barrier elements to enable a three-dimensional view to be formed. For example, as shown inFIG. 7 ,barrier element array 704 includes a plurality of barrier elements that are each either transparent (in a non-blocking state) or opaque (in a blocking state). Barrier elements that are blocking are indicated as barrier elements 710 a-710 f, and barrier elements that are non-blocking are indicated as barrier elements 712 a-712 e. Further barrier elements may be included inbarrier element array 704 that are not visible inFIG. 7 . Each of barrier elements 710 a-710 f and 712 a-712 e may include one or more barrier elements. Barrier elements 710 alternate with barrier elements 712 in series in the order ofbarrier elements barrier element array 704. - For instance,
FIG. 8A shows a view ofparallax barrier 300 ofFIG. 3 with transparent slits, according to an example embodiment. As shown inFIG. 8A ,parallax barrier 300 includesbarrier element array 302, which includes a plurality ofbarrier elements 304 arranged in a two-dimensional array. Furthermore, as shown inFIG. 8A ,barrier element array 302 includes a plurality of parallel strips ofbarrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips (or “slits”) 802 a-802 g. As shown inFIG. 8A , parallel non-blocking strips 802 a-802 g (non-blocking slits) are alternated with parallel opaque or blocking strips 804 a-804 g ofbarrier elements 304 that are selected to be blocking. In the example ofFIG. 8A , non-blocking strips 802 a-802 g and blocking strips 804 a-804 g each have a width (along the x-dimension) of twobarrier elements 304, and have lengths that extend along the entire y-dimension (twenty barrier elements 304) ofbarrier element array 304, although in other embodiments, may have alternative dimensions. Non-blocking strips 802 a-802 g and blocking strips 804 a-804 g form a parallax barrier configuration forparallax barrier 300. The spacing (and number) of parallel non-blocking strips 802 inbarrier element array 704 may be selectable by choosing any number and combination of particular strips ofbarrier elements 304 inbarrier element array 302 to be non-blocking, to be alternated with blocking strips 804, as desired. -
FIG. 8B shows aparallax barrier 310 that is another example ofbarrier element array 704 with parallel transparent slits, according to an embodiment. Similarly toparallax barrier 300 ofFIG. 8A ,parallax barrier 310 has includes abarrier element array 312, which includes a plurality ofbarrier elements 314 arranged in a two-dimensional array (28 by 1 array).Barrier elements 314 have widths (along the x-dimension) similar to the widths ofbarrier elements 304 inFIG. 8A , but have lengths that extend along the entire vertical length (y-dimension) ofbarrier element array 314. As shown inFIG. 8B ,barrier element array 312 includes parallel non-blocking strips 802 a-802 g alternated with parallel blocking strips 804 a-804 g. In the example ofFIG. 8B , parallel non-blocking strips 802 a-802 g and parallel blocking strips 804 a-804 g each have a width (along the x-dimension) of twobarrier elements 314, and have lengths that extend along the entire y-dimension (one barrier element 314) ofbarrier element array 312. - The light received from the array of pixels is filtered according to the particular parallax barrier configuration to form at least one image in a viewing space.
Barrier element array 210 ofparallax barrier 210 is configured to filter light 252 received from pixel array 208 (FIG. 2A ) or light 238 received from light element array 236 (FIG. 2B ) according to whetherbarrier element array 210 is transparent or non-blocking (e.g., in a two-dimensional mode) or includes parallel non-blocking strips (e.g., in a three-dimensional mode). Ifbarrier element array 210 is transparent (e.g., as shown forbarrier element array 302 inFIG. 3 ),barrier element array 210 functions as an “all pass” filter to substantially pass all of light 252 as filtered light 110 to deliver the two-dimensional image generated bypixel array 208 toviewing space 106, to be viewable as a two-dimensional image in a similar fashion as a conventional display. Ifbarrier element array 210 includes parallel non-blocking strips (e.g., as shown forbarrier element array 302 inFIGS. 8A and 8B ),barrier element array 210 passes a portion of light 252 as filtered light 110 to deliver a three-dimensional image toviewing space 106. - For example, as shown in
FIG. 7 ,pixel array 702 includes a plurality of pixels 714 a-714 d and 716 a-716 d. Pixels 714 alternate with pixels 716, such that pixels 714 a-714 d and 716 a-716 d are arranged in series in the order ofpixels pixel array 702 that are not visible inFIG. 7 , including further pixels along the width dimension of pixel array 702 (e.g., in the left-right directions) as well as pixels along a length dimension of pixel array 702 (not visible inFIG. 7 ). Each of pixels 714 a-714 d and 716 a-716 d generates light, which emanates fromdisplay surface 724 of pixel array 702 (e.g., generally upward inFIG. 7 ) towardsbarrier element array 704. Some example indications of light emanating from pixels 714 a-714 d and 716 a-716 d are shown inFIG. 7 (as dotted lines), including light 724 a and light 718 a emanating frompixel 714 a, light 724 b, light 718 b, and light 724 c emanating frompixel 714 b, etc. - Furthermore, light emanating from
pixel array 702 is filtered bybarrier element array 704 to form a plurality of images in aviewing space 726, including afirst image 706 a at afirst location 708 a and asecond image 706 b at asecond location 708 b. A portion of the light emanating frompixel array 702 is blocked by blocking barrier elements 710, while another portion of the light emanating frompixel array 702 passes through non-blocking barrier elements 712, according to the filtering bybarrier element array 704. For instance, light 724 a frompixel 714 a is blocked by blockingbarrier element 710 a, and light 724 b and light 724 c frompixel 714 b are blocked by blocking barrier elements 710 b and 710 c, respectively. In contrast, light 718 a frompixel 714 a is passed bynon-blocking barrier element 712 a and light 718 b frompixel 714 b is passed by non-blocking barrier element 712 b. - By forming parallel non-blocking slits in a barrier element array, light from a pixel array can be filtered to form multiple images or views in a viewing space. For instance,
system 700 shown inFIG. 7 is configured to form first andsecond images locations distance 728 from pixel array 702 (as shown inFIG. 7 , further instances of first andsecond images viewing space 726 according tosystem 700, in a repeating, alternating fashion). As described above,pixel array 702 includes a first set of pixels 714 a-714 d and a second set of pixels 716 a-716 d. Pixels 714 a-714 d correspond tofirst image 706 a and pixels 716 a-716 d correspond tosecond image 706 b. Due to the spacing of pixels 714 a-714 d and 716 a-716 d inpixel array 702, and the geometry of non-blocking barrier elements 712 inbarrier element array 704, first andsecond images locations FIG. 7 , light 718 a-718 d from the first set of pixels 714 a-714 d is focused atlocation 708 a to formfirst image 706 a atlocation 708 a. Light 720 a-720 d from the second set of pixels 716 a-716 d is focused atlocation 708 b to formsecond image 706 b atlocation 708 b. -
FIG. 7 shows a slit spacing 722 (center-to-center) of non-blocking barrier elements 712 inbarrier element array 704. Spacing 722 may be determined to select locations for parallel non-blocking slits to be formed inbarrier element array 704 for aparticular image distance 728 at which images are desired to be formed (for viewing by users). For example, in an embodiment, if a spacing of pixels 714 a-714 d corresponding to an image is known, and adistance 728 at which the image is desired to be displayed is known, the spacing 722 between adjacent parallel non-blocking slits inbarrier element array 704 may be selected. As shown inFIG. 9 , in an embodiment, barrier array controller 206 (ofFIG. 2A or 2B) may include aslit spacing calculator 902.Slit spacing calculator 902 is configured to calculate spacing 722 for a particular spacing of pixels and a desired distance for the corresponding image to be formed, according to corresponding parallax barrier configurations. - For instance,
FIG. 10 shows anexample display system 1000, according to an example embodiment.Display system 1000 is generally similar tosystem 700 shown inFIG. 7 , and includespixel array 702 andbarrier element array 704.Pixel array 702 includes pixels 714 a-714 d and 716 a-716 d, andbarrier element array 704 includes blocking barrier elements 710 a-710 f and non-blocking barrier elements 712 a-712 e. Animage 1002 is desired to be formed at animage distance 1004 frompixel array 702 based on pixels 714 a-714 d.Barrier element array 704 is separated frompixel array 702 by adistance 1012. Adjacent pixels of pixels 714 a-714 d (corresponding to the desired image) are separated by apixel separation distance 1006. Spacing 722 for adjacent non-blocking barrier elements 712 a-712 e (corresponding to non-blocking slits) is desired to be selected to enableimage 1002 to be formed atdistance 1004 frompixel array 702. For the configuration ofdisplay system 1000 inFIG. 10 , the following equation (Equation 1) holds: -
distance 1006/distance 1004=spacing 722/(distance 1004−distance 1012)Equation 1 - As such,
spacing 722 may be calculated (e.g., by slit spacing calculator 902) according to Equation 2 shown below, where slit spacing 722 is less than pixel separation distance 1006: -
spacing 722=distance 1006×(distance 1004−distance 1012)/distance 1004 Equation 2 - For instance, in one example embodiment,
distance 1006 may equal 1.0 mm,distance 1004 may equal 2.0 meters, anddistance 1012 may equal 5.0 mm. In such an example, spacing 722 may be calculated according to Equation 2 as follows: -
spacing 722=1.0×(2000−5)/2000=0.9975 mm - In the above example, the centers of adjacent non-blocking barrier elements 712 a-712 e may be separated by spacing 722 of 0.9975 mm to form
image 1002 at 2.0 meters frompixel array 702. As shown inFIG. 10 , light 1010 a-1010 d emanated by pixels 714 a-714 d, as filtered bybarrier element array 704,forms image 1002 atlocation 1008. Separating the centers of adjacent non-blocking barrier elements 712 a-712 e by 0.9975 mm (or other determined distance) may be accomplished in various ways, depending on the particular configuration ofbarrier element array 704. For instance, in this example, a single barrier element width non-blocking slit may be formed inbarrier element array 704 every 0.9975 mm. Alternatively, a non-blocking slit may be formed inbarrier element array 704 every 0.9975 mm having a width of more than one barrier element. - For example, if spacing 722 corresponds to the width of two barrier elements, single non-blocking barrier elements 712 having a width of 0.9975/2=0.4988 mm may be alternated with single blocking barrier elements 710 having the width of 0.4988 mm in
barrier element array 704. Alternatively, if spacing 722 corresponds to the width of more than two barrier elements, one or more non-blocking barrier elements may be alternated with one or more blocking barrier elements to for non-blocking slits every 0.9975 mm. In one example, single non-blocking barrier elements 712 having a width of 0.9975/399=0.0025 mm may be alternated with three hundred and ninety-eight blocking barrier elements 710 each having the width of 0.0025 mm inbarrier element array 704. In another example, ten non-blocking barrier elements 712 each having a width of 0.0025 mm may be alternated with three hundred and eighty-nine blocking barrier elements 710 each having the width of 0.0025 mm inbarrier element array 704. - Thus, referring to
FIG. 7 , first andsecond images display system 700 at adistance 728 frompixel array 702 by calculating a value for slit spacing 722 as described above. Equation 2 is provided as one example technique for selecting non-blocking slit spacing, for purposes of illustration. Alternatively, other techniques may be used to calculate and/or determine values forslit spacing 722. For instance, in an embodiment, a lookup table that includes pre-calculated values for slit spacing 722 may be maintained bybarrier array controller 206. The lookup table may be used to look up values for slit spacing 722 for corresponding values ofimage distance 1004 andpixel spacing 1006. - It is noted that in the examples of
FIGS. 7 and 10 ,pixel array 702 andbarrier element array 704 are each shown as being substantially planar. In other embodiments,pixel array 702 and/orbarrier element array 704 may be curved (e.g., concave or convex relative to viewing space 726). As such, equations, lookup tables, etc., used to calculate values for slit spacing 722 and/or other parameters of a display system may be configured to account for such curvature, in a manner as would be known to persons skilled in the relevant art(s). - First and
second images FIG. 11 showsdisplay system 700 ofFIG. 7 , where auser 1104 receivesfirst image 706 a at afirst eye location 1102 a andsecond image 706 b at a second eye location 1102 b, according to an example embodiment. First andsecond images Images user 1104 to be perceived as a three-dimensional image or view. - In such an embodiment, first and
second images display system 700 such that their centers are spaced apart a width of a user's pupils (e.g., an “interocular distance” 1106). For example, the spacing of first andsecond images interocular distance 1106. As described above, multiple instances of first andsecond images display system 700 that repeat in a viewing space. Thus, first andsecond images FIG. 11 that coincide with the left and right eyes ofuser 1104 may be adjacent first andsecond images interocular distance 1106. Alternatively, first andsecond images FIG. 11 coinciding with the left and right eyes ofuser 1104 may be separated by one or more instances of first andsecond images interocular distance 1106. - Referring back to
FIG. 6 , instep 606, the array of barrier elements is configured into a second parallax barrier configuration that includes a third set of the barrier elements of the array of barrier elements in the blocking state and a fourth set of the barrier elements of the array of barrier elements in the non-blocking state to provide the viewer located at a second position with the three-dimensional view. For example, user 1102 ofFIG. 11 may change positions in viewing space 106 (FIG. 1 ), and assuch parallax barrier 104 may adapt to a different parallax barrier configuration to cause the three-dimensional view to be moved from the first position of user 1102 to the second position of user 1102. In such case, referring toFIG. 2A or 2B,barrier array controller 206 may generate control signal 216 to configurebarrier element array 210 to include transparent strips of barrier elements configured to enable the three-dimensional view to be formed at the second position. The next subsection describes example embodiments for configuringbarrier element array 210 into a second configuration, according tostep 606, and into further configurations of blocking and non-blocking states to provide viewers with three-dimensional views. - Furthermore, although
FIGS. 7 and 11 show display system 700 having a configuration similar todisplay system 200 ofFIG. 2A , alternatively,display system 700 may be configured similarly todisplay system 220 ofFIG. 2B to generateimages viewing space 726. In such an embodiment,barrier element array 704 may be positioned between a backlighting panel (that is positioned wherepixel array 702 is shown inFIGS. 7 and 10 ) andpixel array 702, andpixel array 702 is configured as a light filter (is not light emitting). The backlighting panel emits light that is filtered bybarrier element array 704 as described above, and the filtered light is filtered bypixel array 702 to impose images on the light filtered bypixel array 702, formingimages FIGS. 7 and 10 . - As described, in an embodiment,
display system 700 may be configured to generate a two-dimensional image for viewing by users in a viewing space. For example, flowchart 600 (FIG. 6 ) may optionally include astep 1202 shown inFIG. 12 to enable a two-dimensional view to be delivered to users, according to an embodiment. Instep 1202, the array of barrier elements is configured into a third configuration to deliver a two-dimensional view. For example, in the third configuration,barrier array controller 206 may generate control signal 216 to configure each barrier element ofbarrier element array 210 to be in the non-blocking state (transparent). In such case,barrier element array 210 may be configured similarly tobarrier element array 302 shown inFIG. 3 , where allbarrier elements 304 are selected to be non-blocking. Ifbarrier element array 210 is transparent,barrier element array 210 functions as an “all pass” filter to substantially pass all of light 252 (FIG. 2A ) or light 238 (FIG. 2B ) as filtered light 110 to deliver the two-dimensional image generated bypixel array 208 toviewing space 106, to be viewable as a two-dimensional image in a similar fashion as a conventional display. - B. Example Parallax Barrier Configurations
- As described above, various characteristics of
parallax barrier 300 ofFIG. 3 may be modified to provide various parallax barrier configurations that deliver three-dimensional views with different characteristics and/or at different locations (e.g., at a changed viewer position). For instance,FIG. 13 shows astep 1302 that may be performed instep 606 of flowchart 600 (FIG. 6 ) to provide a second or subsequent parallax barrier configuration, according to example embodiments. Instep 1302, at least one of a distance between adjacent non-blocking slits of the plurality of parallel non-blocking slits or a width of at least one non-blocking slit of the plurality of parallel non-blocking slits is modified. For example, referring toFIGS. 8A and 8B , a distance between adjacent non-blocking strips 802 (e.g., center-to-center slit spacing 722 ofFIG. 7 and/or a width of one or more blocking strips 804) may be modified and/or a width of one or more non-blocking strips 802 may be modified. These and/or further parallax barrier parameters may be configured in any number of ways to create multiple additional parallax barrier configurations that each have a corresponding set of the barrier elements in the blocking state and a corresponding set of barrier elements in the non-blocking state to support a viewer located at any number of corresponding positions. - For instance,
FIG. 14 shows a view ofparallax barrier 300 ofFIG. 3 , according to an example embodiment. As shown inFIG. 14 ,parallax barrier 300 includesbarrier element array 302, which includes a plurality ofbarrier elements 304 arranged in a two-dimensional array. Furthermore, as shown inFIG. 14 ,barrier element array 302 includes a plurality of parallel strips ofbarrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips 1402 a-1402 e. As shown inFIG. 14 , parallel non-blocking strips 1402 a-1402 e are alternated with parallel blocking strips 1404 a-1404 f ofbarrier elements 304 that are selected to be blocking. In the example ofFIG. 14 , non-blocking strips 1402 a-1402 e each have a width (along the x-dimension) of twobarrier elements 304, and blocking strips 1404 a-1404 f each have a width of threebarrier elements 304. Thus, relative toFIGS. 8A and 8B , where blocking strips 804 a-804 g each have a width of twobarrier elements 304, blocking strips 1404 a-1404 g have been modified to be wider to form another parallax barrier configuration. - In embodiments, blocking strips may be modified to be wider or narrower by any desired number of
barrier elements 304, including a single barrier element (as inFIG. 14 versusFIG. 8A ) or multiple barrier elements, including tens, hundreds, or even further numbers of barrier elements. A width of the blocking strips may be modified for various reasons. For example, the width of the blocking strips may be modified to be wider to reduce a resolution and/or an intensity of the display image(s), to increase a distance at which views are delivered, and/or to modify lateral positions of delivered views. Alternatively, the width of the blocking strips may be modified to be narrower to increase a resolution and/or an intensity of the display image(s), to decrease a distance at which views are delivered, and/or to modify lateral positions of delivered views. - For instance,
FIG. 15 shows adisplay system 1500, according to an example embodiment.System 1500 is generally similar tosystem 700 ofFIG. 7 , with differences described as follows. As shown inFIG. 15 ,system 1500 includes apixel array 1502 and abarrier element array 1504.System 1500 may also includedisplay controller 202 ofFIG. 2 , which is not shown inFIG. 15 for ease of illustration.Pixel array 1502 includes a first set of pixels 1514 a-1514 d and a second set of pixels 1516 a-1516 d. First set of pixels 1514 a-1514 d and second set of pixels 1516 a-1516 d are configured to generate corresponding images or views that can be combined to be perceived as a single three-dimensional image or view. Pixels of the two sets of pixels are alternated inpixel array 1502 in the order ofpixel 1514 a,pixel 1516 a,pixel 1514 b, pixel 1516 b, etc. Further pixels may be included in each set of pixels inpixel array 1502 that are not visible inFIG. 15 , including hundreds, thousands, or millions of pixels in each set of pixels. - As shown in
FIG. 15 ,barrier element array 1504 includes barrier elements that are each either transparent or opaque. As shown inFIG. 15 , barrier elements that are blocking are indicated as barrier elements 1510 a-1510 f, and barrier elements that are non-blocking are indicated as barrier elements 1512 a-1512 e. Blocking barrier elements 1510 are alternated with non-blocking barrier elements 1512 to form a plurality of parallel non-blocking slits inbarrier element array 1504, similarly tobarrier element array 304 shown inFIG. 8A . Light emanating frompixel array 1502 is filtered bybarrier element array 1504 to form first andsecond images locations FIG. 15 , barrier elements 1512 a-1512 e are each wider relative to barrier elements 710 a-710 f ofFIG. 7 , while a spacing of pixels 1514 a-1514 d is similar to the spacing of pixels 714 a-714 d inFIG. 7 . As such, adistance 1524 at which first andsecond images pixel array 1502 is greater thandistance 728 at which first andsecond images pixel array 702 inFIG. 7 . In this manner, if user 1104 (FIG. 11 ) has moved from a first position inviewing space 106 atdistance 728 to a second position inviewing space 106 atdistance 1524, the three-dimensional view may still be delivered touser 1104 by reconfiguringparallax barrier 704 from a first configuration to a second configuration. Configurations ofparallax barrier 704 may enable views to be delivered touser 1104 at lesser and greater distances thandistance 728. - For example, Equation 2 shown above may be rewritten as Equation 3 shown below to solve for
distance 1004 inFIG. 10 as factor of spacing 722: -
distance 1004=(distance 1006×distance 1012)/(distance 1006−spacing 722) Equation 3 - As indicated by Equation 3, if spacing 722 is less than the value of
distance 1006, and is increased towards the value ofdistance 1006,distance 1004 increases. If spacing 722 is less than the value ofdistance 1006, and is decreased further from the value ofdistance 1006,distance 1004 decreases. - As indicated in step 1302 (
FIG. 13 ), a width of one or more non-blocking slits in a barrier element array may be modified. For example,FIG. 16 shows a view ofparallax barrier 300 ofFIG. 3 with a different width of non-blocking slits, according to an example embodiment. As shown inFIG. 16 ,parallax barrier 300 includesbarrier element array 302, which includes a plurality ofbarrier elements 304 arranged in a two-dimensional array.Barrier element array 302 includes a plurality of parallel strips ofbarrier elements 304 that are selected to be non-blocking to form a plurality of parallelnon-blocking strips 1602. As shown inFIG. 16 , parallelnon-blocking strips 1602 are alternated withparallel blocking strips 1604 ofbarrier elements 304. In the example ofFIG. 16 ,non-blocking strips 1602 each have a width (along the x-dimension) of onebarrier element 304, and blockingstrips 1604 each have a width of onebarrier element 304. - Thus, in embodiments, a width of non-blocking slits in a barrier element may be modified. The width of the non-blocking slits may be modified to have any width of one or
more barrier elements 304. The widths of non-blocking slits may be widened or narrowed for various reasons, including decreasing or increasing display resolution, decreasing or increasing clarity of images generated by one or more portions of the barrier element array, etc. - C. Example Image Orientation Embodiments
- As described above, in embodiments, parallel non-blocking slits may be implemented in a barrier element array to generate three-dimensional images. In such an embodiment, the slits are oriented such that an axis that crosses through both eyes of a user (e.g.,
user 1104 inFIG. 11 ) is perpendicular to an axis along the length of the non-blocking slits. As such, a user sitting or standing in a viewing space sits or stands such that their body is generally aligned parallel to the non-blocking slits. Thus, in an embodiment, an orientation of the non-blocking slits of a barrier element array may be selected to be aligned with the body of a user. Furthermore, the orientation of non-blocking slits of a barrier element array may be selected on a section-by-section of the barrier element array basis. Each section of the barrier element array may include non-blocking slits that are aligned with a corresponding user to provide a three-dimensional image to that user. - For instance,
FIG. 17 shows astep 1702 that may be performed duringflowchart 600, according to example embodiments. Instep 1702, each non-blocking slit of the plurality of parallel non-blocking slits is oriented at a selected angle relative to an axis of the barrier element array. For instance,FIGS. 18 and 19 show views ofparallax barrier 300 ofFIG. 3 with non-blocking slits having alternative orientations, according to an example embodiment. As shown inFIG. 18 ,parallax barrier 300 includesbarrier element array 302, which includes a plurality ofbarrier elements 304 arranged in a two-dimensional array.Barrier element array 302 includes a plurality of parallel strips ofbarrier elements 304 that are selected to be non-blocking to form a plurality of parallel non-blocking strips 1802 (each having a width of one barrier elements 304). As shown inFIG. 18 , parallelnon-blocking strips 1802 are alternated withparallel blocking strips 1804 of barrier elements 304 (each having a width of two barrier elements 304). Parallelnon-blocking strips 1802 are oriented in a first direction along a horizontal axis ofbarrier element array 302. - In
FIGS. 8A and 8B , parallel non-blocking strips 802 are oriented vertically, and thus may be configured to generate a three-dimensional image in a viewing space (as described above) to be viewable by a user whose body is oriented vertically (e.g., sitting upright or standing up). InFIG. 18 , parallelnon-blocking strips 1802 are oriented perpendicularly to parallel non-blocking strips 802 ofFIGS. 8A and 8B . As such, parallelnon-blocking strips 1802 may be configured to generate a three-dimensional image in a viewing space (as described above) to be viewable by a user whose body is oriented horizontally (e.g., laying down). In this manner, users who are oriented differently relative to each other can still each be provided with a corresponding three-dimensional image that accommodates their position. - As such, horizontally and vertically oriented three-dimensional images may be enabled by
barrier element array 304 by corresponding parallax barrier configurations. Furthermore,barrier element array 304 may enable three-dimensional images of any orientation to be provided, including any angle between horizontal and vertical, by providing parallel non-blocking strips inbarrier element array 302 of the desired angle (and by providing corresponding pixels in the pixel array arranged according to the desired angle). For example,FIG. 19 showsparallax barrier 300, withbarrier element array 302 including a plurality of parallel non-blocking strips 1902 (each having a width of one barrier element 304). As shown inFIG. 18 , parallelnon-blocking strips 1902 are alternated withparallel blocking strips 1904 of barrier elements 304 (each having a width of five barrier elements 304). Parallelnon-blocking strips 1902 are oriented at an acute angle 1906 (an angle between zero and 90 degrees) relative to thehorizontal axis 1908 ofbarrier element array 302. In embodiments,angle 1906 may have any value, to enable a user oriented at substantially the same angle to be provided with a corresponding three-dimensional image that accommodates their position, according to a corresponding parallax barrier configuration. - D. Example Viewer Position Determining and Image Tuning Embodiments
- As described above, parallax barriers may be reconfigured to change the locations of delivered views based on changing viewer positions. As such, a position of a viewer may be determined/tracked so that a parallax barrier may be reconfigured to deliver views consistent with the changing position of the viewer. In embodiments, a position of a viewer may be determined/tracked by determining a position of the viewer directly, or by determining a position of a device associated with the viewer (e.g., a device worn by the viewer, held by the viewer, sitting in the viewer's lap, in the viewer's pocket, sitting next the viewer, etc.).
- For instance,
FIG. 20 shows a block diagram of adisplay environment 2000, according to an example embodiment. As shown inFIG. 20 ,display environment 2000 includes adisplay device 2002, aremote device 2004, and aviewer 2006.Display device 2002 is an example ofdisplay system 112 ofFIG. 1 , and may be configured similarly to display device 250 (FIG. 2A ) or display device 260 (FIG. 2B ) in embodiments.Viewer 2006 is delivered a three-dimensional view 2008 by display device 2002 (display device 2002 may optionally also deliver a two-dimensional view to viewer 2006).Remote device 2004 is a device thatviewer 2006 may use to interact withdisplay device 2002. For example,remote device 2004 may be a remote control, a headset, game controller, a smart phone, or other device.Display device 2002 and/orremote device 2004 may operate to provideposition information 2010 regardinguser 2006 to displaydevice 2002.Display device 2002 may useposition information 2010 to reconfigure a parallax barrier ofdisplay device 2002 to enableview 2008 to be delivered toviewer 2006 at various positions forviewer 2006. For example,display device 2002 and/orremote device 2004 may use positioning techniques to track the position ofviewer 2006. -
Remote device 2004 may be configured in various ways to enable the position ofviewer 2006 to be tracked. For instance,FIG. 21 shows a block diagram ofremote device 2004, according to an example embodiment. As shown inFIG. 21 ,remote device 2004 may include atransmitter 2102, apositioning module 2104, aposition calculator 2106, auser interface module 2108, one or more camera(s) 2110, and animage processing system 2112.Remote device 2004 may include one or more of these elements shown inFIG. 21 , depending on the particular embodiment. These elements ofremote device 2004 are described as follows. -
Positioning module 2104 may be included inremote device 2004 to determine a position ofremote device 2004 according to a positioning technique, such triangulation or trilateration. For instance,positioning module 2104 may include one or more receivers that receive satellite broadcast signals (e.g., a global positioning system (GPS) module that receives signals from GPS satellites).Position calculator 2106 may calculate the position ofremote device 2004 by precisely timing the received signals according to GPS techniques. In another embodiment,positioning module 2104 may include one or more receivers that receive signals transmitted bydisplay device 2002 that are used byposition calculator 2106 to calculate the position ofremote device 2004. In other embodiments,positioning module 2104 andposition calculator 2106 may implement other types of positioning techniques. -
User interface module 2108 may be present to enableviewer 2006 to interact withremote device 2004. For example,user interface module 2108 may include any number and combination of user interface elements, such as a keyboard, a thumb wheel, a pointing device, a roller ball, a stick pointer, a joystick, a thumb pad, a display, a touch sensitive display, any number of virtual interface elements, a voice recognition system, a haptic interface, and/or other user interface elements described elsewhere herein or otherwise known.User interface module 2108 may be configured to enableviewer 2006 to manually enter position information forviewer 2006 intoremote device 2004, including manually entering coordinates ofviewer 2006 inviewing space 106, entering an indication of a predetermined location in viewingspace 106 into remote device 2004 (e.g., a “location A”, a “seat D,” etc.), or providing position information in any other manner. - Camera(s) 2110 may be present in
remote device 2004 to enable optical position detection ofviewer 2006. For example, camera(s) 2110 may be pointed byviewer 2006 atdisplay device 2002, which may display a symbol or code, and one or more images of the displayed symbol or code may be captured by camera(s) 2110.Image processing system 2112 may receive the captured image(s), and determine a position ofremote device 2004 relative to displaydevice 2002 based on the captured image(s). For example, in an embodiment, camera(s) 2110 may include a pair of cameras, andimage processing system 2112 may perform dual image processing to determine the position ofremote device 2004 relative to displaydevice 2002. -
Transmitter 2102 is configured to transmitposition information 2010 to displaydevice 2002 fromremote device 2004.Position information 2010 may include a determined position for remote device 2004 (e.g., calculated byposition calculator 2106 or image processing system 2112), and/or may include captured data (e.g., received signal data received bypositioning module 2104, images captured by camera(s) 2110, etc.) so thatdisplay device 2002 may determine the position ofremote device 2004 based on the captured data. -
Display device 2002 may have any form, such as any one or more of a display or monitor, a game console, a set top box, a stereo receiver, a computer, any other display device mentioned elsewhere herein or otherwise known, or any combination of such devices.Display device 2002 may be configured in various ways to enable the position ofviewer 2006 to be tracked. For instance,FIG. 22 shows a block diagram ofdisplay device 2002, according to an example embodiment. As shown inFIG. 21 ,display device 2002 may include aposition determiner module 2214 configured to determine a position of one or more viewers.Position determiner module 2214 may include areceiver 2202, one or more transmitter(s) 2204, aposition calculator 2206, amicrophone array 2208, one or more camera(s) 2210, and animage processing system 2112.Position determiner module 2214 may include one or more of these elements, depending on the particular embodiment. As shown inFIG. 22 ,position determiner module 2214 generatesposition information 2216 based on one or more ofreceiver 2202, transmitter(s) 2204,position calculator 2206,microphone array 2208, camera(s) 2210, andimage processing system 2112.Position information 2216 may be received bydisplay controller 2002, and used bydisplay controller 2002 to adapt display device 2002 (e.g., adapting one or more ofparallax barrier 104,pixel array 114, and/or backlighting 116 ofFIG. 1 according to corresponding control signals) to deliver views toviewer 2006 asviewer 2006 may reposition within a viewing space. These elements ofdisplay device 2002 are described as follows. - When present,
microphone array 2208 includes one or more microphones that may be positioned in various microphone locations in and/or arounddisplay device 2002 to capture sounds (e.g., voice) fromviewer 2006.Microphone array 2208 produces signals representative of the received sounds, which may be received byposition calculator 2206.Position calculator 2206 may be configured to use the received signals to determine the location ofviewer 2006. For example,position calculator 2206 may use voice recognition techniques to determine that the sounds are received fromviewer 2006, and may perform audio localization techniques to determine a position ofviewer 2006 based on the sounds. - Camera(s) 2210 may be present in
display device 2002 to enable optical position detection ofviewer 2006. For example, camera(s) 2210 may be pointed fromdisplay device 2002 toviewing space 106 to capture images ofviewer 2006 and/orremote device 2004.Viewer 2006 and/orremote device 2004 may optionally display a symbol or code, and the displayed symbol or code may be captured in the images.Image processing system 2212 may receive the captured image(s), and determine a position ofviewer 2006 and/orremote device 2004 relative to displaydevice 2002 based on the captured image(s) (e.g., using facial recognition, image processing of the symbol or code, etc.). For example, in an embodiment, camera(s) 2210 may include a pair of cameras, andimage processing system 2212 may perform dual image processing to determine the position ofviewer 2006 and/orremote device 2004 relative to displaydevice 2002. - When present, transmitter(s) may be configured to transmit signals that may be received by
positioning module 2104 to determine a position ofremote device 2004, as described above with respect toFIG. 21 . -
Receiver 2202 may be configured to receiveposition information 2010 fromremote device 2004. As described above,position information 2010 may include a determined position forremote device 2004 and/or may include captured data (e.g., received signal data, images, etc.).Display device 2002 may determine the position ofremote device 2004 based on the captured data. For example,position calculator 2106 may determine a position ofremote device 2004 based on the signal data received bypositioning module 2104 atremote device 2004. Alternatively,image processing system 2112 may determine a position ofremote device 2004 based on the images captured by camera(s) 2210 atremote device 2004. -
Display controller 202,pixel array controller 204,barrier array controller 206,pixel array controller 228,light source controller 230, slitspacing calculator 902,positioning module 2104,position calculator 2106,image processing system 2112,position determiner module 2214,position calculator 2206, andimage processing system 2212 may be implemented in hardware, software, firmware, or any combination thereof. For example,display controller 202,pixel array controller 204,barrier array controller 206,pixel array controller 228,light source controller 230, slitspacing calculator 902,positioning module 2104,position calculator 2106,image processing system 2112,position determiner module 2214,position calculator 2206, and/orimage processing system 2212 may be implemented as computer program code configured to be executed in one or more processors. Alternatively,display controller 202,pixel array controller 204,barrier array controller 206,pixel array controller 228,light source controller 230, slitspacing calculator 902,positioning module 2104,position calculator 2106,image processing system 2112,position determiner module 2214,position calculator 2206, and/orimage processing system 2212 may be implemented as hardware logic/electrical circuitry. - For instance,
FIG. 23 shows a block diagram of an example implementation ofdisplay controller 202, according to an embodiment. In embodiments,display controller 202 may include one or more of the elements shown inFIG. 23 . As shown in the example ofFIG. 23 ,display controller 202 may include one or more processors (also called central processing units, or CPUs), such as aprocessor 2304.Processor 2304 is connected to acommunication infrastructure 2302, such as a communication bus. In some embodiments,processor 2304 can simultaneously operate multiple computing threads. -
Display controller 202 also includes a primary ormain memory 2306, such as random access memory (RAM).Main memory 2306 has stored therein control logic 2328A (computer software), and data. -
Display controller 202 also includes one or moresecondary storage devices 2310.Secondary storage devices 2310 include, for example, ahard disk drive 2312 and/or a removable storage device or drive 2314, as well as other types of storage devices, such as memory cards and memory sticks. For instance,display controller 202 may include an industry standard interface, such a universal serial bus (USB) interface for interfacing with devices such as a memory stick.Removable storage drive 2314 represents a floppy disk drive, a magnetic tape drive, a compact disk drive, an optical storage device, tape backup, etc. -
Removable storage drive 2314 interacts with aremovable storage unit 2316.Removable storage unit 2316 includes a computer useable orreadable storage medium 2324 having stored thereincomputer software 2328B (control logic) and/or data.Removable storage unit 2316 represents a floppy disk, magnetic tape, compact disk, DVD, optical storage disk, or any other computer data storage device.Removable storage drive 2314 reads from and/or writes toremovable storage unit 2316 in a well known manner. -
Display controller 202 further includes a communication ornetwork interface 2318.Communication interface 2318 enables thedisplay controller 202 to communicate with remote devices. For example,communication interface 2318 allowsdisplay controller 202 to communicate over communication networks or mediums 2342 (representing a form of a computer useable or readable medium), such as LANs, WANs, the Internet, etc.Network interface 2318 may interface with remote sites or networks via wired or wireless connections. -
Control logic 2328C may be transmitted to and fromdisplay controller 202 via the communication medium 2342. - Any apparatus or manufacture comprising a computer useable or readable medium having control logic (software) stored therein is referred to herein as a computer program product or program storage device. This includes, but is not limited to,
display controller 202,main memory 2306,secondary storage devices 2310, andremovable storage unit 2316. Such computer program products, having control logic stored therein that, when executed by one or more data processing devices, cause such data processing devices to operate as described herein, represent embodiments of the invention. - Devices in which embodiments may be implemented may include storage, such as storage drives, memory devices, and further types of computer-readable media. Examples of such computer-readable storage media include a hard disk, a removable magnetic disk, a removable optical disk, flash memory cards, digital video disks, random access memories (RAMs), read only memories (ROM), and the like. As used herein, the terms “computer program medium” and “computer-readable medium” are used to generally refer to the hard disk associated with a hard disk drive, a removable magnetic disk, a removable optical disk (e.g., CDROMs, DVDs, etc.), zip disks, tapes, magnetic storage devices, MEMS (micro-electromechanical systems) storage, nanotechnology-based storage devices, as well as other media such as flash memory cards, digital video discs, RAM devices, ROM devices, and the like. Such computer-readable storage media may store program modules that include computer program logic for
display controller 202,pixel array controller 204,barrier array controller 206,pixel array controller 228,light source controller 230, slitspacing calculator 902,positioning module 2104,position calculator 2106,image processing system 2112,position determiner module 2214,position calculator 2206,image processing system 2212,flowchart 600,step 1202,step 1302, step 1702 (including any one or more steps of flowchart 600), and/or further embodiments of the present invention described herein. Embodiments of the invention are directed to computer program products comprising such logic (e.g., in the form of program code or software) stored on any computer useable medium. Such program code, when executed in one or more processors, causes a device to operate as described herein. - The invention can work with software, hardware, and/or operating system implementations other than those described herein. Any software, hardware, and operating system implementations suitable for performing the functions described herein can be used.
- As described herein,
display controller 202 may be implemented in association with a variety of types of display devices. Such display devices may be implemented in or in association with a variety of types of media devices, such as a stand-alone display (e.g., a television display such as flat panel display, etc.), a computer, a game console, a set top box, a digital video recorder (DVR), etc. Media content that is delivered in two-dimensional or three-dimensional form according to embodiments described herein may be stored locally or received from remote locations. For instance, such media content may be locally stored for playback (replay TV, DVR), may be stored in removable memory (e.g. DVDs, memory sticks, etc.), may be received on wireless and/or wired pathways through a network such as a home network, through Internet download streaming, through a cable network, a satellite network, and/or a fiber network, etc. For instance,FIG. 23 shows afirst media content 2330A that is stored inhard disk drive 2312, asecond media content 2330B that is stored instorage medium 2324 ofremovable storage unit 2316, and athird media content 2330C that may be remotely stored and received overcommunication medium 2322 bycommunication interface 2318. Media content 2330 may be stored and/or received in these manners and/or in other ways. - While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.
Claims (26)
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