CN100419657C - Multi-object detection method for capacitance type touch panel - Google Patents
Multi-object detection method for capacitance type touch panel Download PDFInfo
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- CN100419657C CN100419657C CNB2005100775735A CN200510077573A CN100419657C CN 100419657 C CN100419657 C CN 100419657C CN B2005100775735 A CNB2005100775735 A CN B2005100775735A CN 200510077573 A CN200510077573 A CN 200510077573A CN 100419657 C CN100419657 C CN 100419657C
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Abstract
The present invention discloses a multi-object detection method for a capacitance touch control board. At least one preset time is used for identifying noise interference or the operation of objects on a touch control board to correctly judge whether the objects touch or leave the touch control board; further, the operation of various different gestures are accurately detected.
Description
Technical field
The detection method of the relevant a kind of capacitive touch control plate of the present invention is particularly about a kind of antinoise multi-object detection method.
Background technology
Capacitive touch control plate is a kind of for the finger input media that slip is moved with the control vernier on level and smooth panel.Because the thickness of capacitive touch control plate is extremely thin, thus can design among ultra-thin notebook computer, keyboard, digital player or other devices, and because it is not mechanical design, so very easy on safeguarding.
Fig. 1 is an existing two-dimensional capacitive touch control plate 100, and it comprises panel 102, Y-axis inductive layer 104, insulation course 106, X-axis inductive layer 108 and base plate 110.When finger 112 contact surface plates 102, the induction amount (electric capacity) of its touch position will produce change, and the control circuit that connects Trackpad 100 can be converted to the electric capacity on the Trackpad induction amount, as shown in Figure 2, and with position, the displacement of judging finger and the direction that moves.In the prior art, confirm whether touch capacitor type Trackpad 100 is as the foundation of judging with detected induction amount size to object, as shown in Figure 3, when induction amount during greater than critical value th, expression object touching Trackpad 100, otherwise when induction amount during less than critical value th, the expression object leaves does not have object to exist on Trackpad 100 or the Trackpad 100.
Yet Trackpad 100 may be subjected to producing noise as the interference of wireless device signals such as mobile phone, makes Trackpad 100 erroneous judgement have object to touch, click, move or other gesture operation thereon.Fig. 4 A is the noise example that is produced on Trackpad 100, this noise obtains the induction amount through analog digital conversion (ADC), shown in Fig. 4 B, the last waveform that obtains Fig. 4 C again through sampling, the waveform that is produced during similar two the finger touches Trackpads 100 of such waveform, as shown in Figure 5, so the noise of Fig. 4 A may be mistaken for two finger touches Trackpads 100, the operation that makes the mistake.
Therefore, a kind of detection method that can prevent noise jamming is to be the institute Ji.
Summary of the invention
The objective of the invention is to, a kind of multi-object detection method of capacitive touch control plate is provided, it can avoid the interference of noise.
According to the present invention, a kind of multi-object detection method of capacitive touch control plate is to distinguish that by setting at least one Preset Time the induction quantitative changeization on the Trackpad is that noise or object are operated on Trackpad, with the touching of correct judgement object or leave this Trackpad, and then detect the operation of various different gestures exactly.
The present invention realizes by the following technical solutions:
A kind of multi-object detection method of capacitive touch control plate comprises: detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least and during all greater than a critical value, calculate the variable quantity of this induction amount at this first and second peak value; Wherein, if this induction amount is kept the trend of increase in a Preset Time, expression has at least two objects to touch this Trackpad.
A kind of multi-object detection method of capacitive touch control plate comprises: after confirming that at least two objects are touched this Trackpad, detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least; And when at least one is less than a critical value in this first and second peak value, calculate the variable quantity of this induction amount; Wherein, as if the trend of in a Preset Time, keeping minimizing less than this first or second peak value of this critical value, represent that at least one leaves this Trackpad in this at least two object.
A kind of multi-object detection method of capacitive touch control plate comprises: affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the touching time of this Trackpad; If this touching time less than one first Preset Time, confirms that then all objects leave this Trackpad; Calculate the time departure that this all objects leaves this Trackpad; And if this time departure greater than one second Preset Time, then send one and click signal; Wherein, calculating this touching during the time, the object number on this Trackpad remains unchanged.
A kind of multi-object detection method of capacitive touch control plate comprises: affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the first touching time of this Trackpad; If this first touching time less than one first Preset Time, confirm that then this at least two object leaves this Trackpad; Calculate the time departure that this at least two object leaves this Trackpad; If this time departure, is then confirmed this this Trackpad of at least two touchings less than one second Preset Time; Calculate this at least two object and touch the second touching time of this Trackpad; If this second touching time less than one the 3rd Preset Time, confirms that then this at least two object leaves this Trackpad; And send one and double-click signal;
Wherein, during the time, the object number of touching this Trackpad remains unchanged in calculating this first and second touching.
A kind of multi-object detection method of capacitive touch control plate comprises:
Affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the touching time of this Trackpad; In this first touching time during, confirm that at least one leaves this Trackpad in this at least two object greater than a Preset Time; The object number on this Trackpad is stayed in calculating; And send one and pull signal; Wherein, calculating this touching during the time, the object number on this Trackpad remains unchanged, and after at least one object left this Trackpad, the object number of staying on this Trackpad must be greater than 1.
Description of drawings
Fig. 1 is the existing two-dimensional capacitive touch control plate;
Fig. 2 is the graph of a relation of induction amount and position on the Trackpad of Fig. 1;
Fig. 3 shows detected induction quantitative changeization behind two finger touches Trackpads;
Fig. 4 A shows a noise;
Fig. 4 B changes resulting induction amount for noise among Fig. 4 A through analog/digital;
Fig. 4 C is with the oscillogram after Fig. 4 B sampling;
Detected oscillogram when Fig. 5 is two finger touches Trackpads;
Fig. 6 for the induction amount greater than critical value th after detected induction quantitative changeization;
Fig. 7 is the difference of twice induction amount among Fig. 6;
Fig. 8 shows that a detection signal is in order to explanation the present invention;
Fig. 9 shows a detection signal and touching signal;
Figure 10 for the induction amount less than critical value th after detected induction quantitative changeization;
Figure 11 is the difference of twice induction amount among Figure 10;
Figure 12 shows a detection signal;
Figure 13 shows a detection signal and leaves signal;
Figure 14 shows that a detection signal and clicks signal;
Figure 15 shows a detection signal and a double-click signal; And
Figure 16 shows a detection signal and a towing signal.
Symbol description
100 capacitive touch control plates, 102 panels
104Y axle inductive layer 106 insulation courses
108X axle inductive layer 110 base plates
112 fingers, 200 current detected induction discharge curves
Once detected induction discharge curve before 202
204 detection signals, 206 detection signals
208 touching signals, 210 current detected induction discharge curves
Once detected induction discharge curve before 212
214 detection signals, 216 detection signals
218 leave signal 220 detection signals
222 click signal 224 detection signals
226 double-click signal 228 detection signals
230 towing signals
Embodiment
Detection method of the present invention does not need to rely on the improvement of hardware testing circuit, just can improve the resistivity of noise, and can distinguish multiple gesture.
Confirm the detection method of many object touchings
Fig. 6 for two peak values of induction amount all greater than detected induction quantitative changeization behind the critical value th, wherein curve 200 is current detected induction amounts, curve 202 is preceding once detected induction amounts.Fig. 7 is the difference of twice induction amount among Fig. 6.Fig. 8 shows a detection signal 204.With reference to Fig. 6,7 and 8, during induction amount on detecting Trackpad, when two peak values of detected induction amount all greater than critical value th, as shown in Figure 6, detection signal 204 transfers noble potential to by electronegative potential, as shown in Figure 8, then in time T
DownDetectThe interior induction amount that continues to detect on this Trackpad, and detected induction amount 200 deducts previous sensed quantity 202 each time, obtains an induction amount difference dV, as shown in Figure 7, if in time T
DownDetectIn, resulting induction amount difference dV be on the occasion of, expression has two objects touchings Trackpad.Each peak value of wherein induction amount is a corresponding object, and therefore in other embodiments, if when having plural object to touch this Trackpad, this induction amount plural peak value occurs with correspondence.
Confirm the detection method of many object touching gestures (Touch Gesture)
Fig. 9 shows a detection signal 206 and touching signal 208.When detecting at least two objects touching Trackpad, begin to calculate this residence time of at least two objects on Trackpad, after meeting aforementioned " confirming the detection method of many objects touching " and determining object touching Trackpad, calculate the object number of this Trackpad of touching, if this at least two object rests on time on the Trackpad continuously greater than preset time T
Touch, send many objects touching signals 208, and a position signalling is sent in the position of calculating this at least two object.Wherein these many object touching signals 208 can comprise the information of object number.
Confirm the detection method that many objects leave
Figure 10 be two peak values of induction amount all less than detected induction quantitative changeization behind the critical value th, wherein curve 210 is current detected induction amounts, curve 212 is preceding once detected induction amounts.Figure 11 is the difference of twice induction amount among Figure 10, and Figure 12 shows a detection signal 214.With reference to Figure 10,11 and 12, behind object touching Trackpad, in case detect the induction amount two peak values at least one less than critical value th, two peak values of induction amount in this embodiment are all less than critical value, as shown in figure 10, detection signal 214 transfers electronegative potential to by noble potential, as shown in figure 12, and then in time T
LiftDetectInterior lasting this induction amount that detects, and detected induction amount 210 deducts previous sensed quantity 212 each time, obtains an induction amount difference dV, as shown in figure 11, if in time T
LiftDetectIn, resulting induction amount difference dV is negative value, represents that at least one leaves Trackpad in this two object.
Confirm that many objects leave the detection method of gesture (Lift Gesture)
Figure 13 shows a detection signal 216 and leaves signal 218.Behind object touching Trackpad, in case when detecting at least one object and leaving Trackpad, begin to calculate the time that this at least one object leaves Trackpad, the object number on this Trackpad is stayed in calculating, if still have object to stay on the Trackpad, calculate its position and send a position signalling, leave the time of Trackpad greater than preset time T meeting aforementioned " confirming the detection method that many objects leave " and object
LiftGestureThe time, send and leave signal 218.Similarly, this leaves the information that signal 208 can comprise the object number.
Many objects are clicked the detection method of gesture (Tap Gesture)
Figure 14 shows that a detection signal 220 and clicks signal 222.When detecting at least two objects touching Trackpad, detection signal 220 transfers noble potential to by electronegative potential, as shown in figure 14, and then calculating this object touches the touching time of this Trackpad and calculates the object number, determining to meet " detection method of confirming many objects touchings ", and this touching time less than a preset time T
TapDownJust detect all objects and leave this Trackpad, then detection signal 220 transfers electronegative potential to by noble potential, and then calculate the time departure that this object leaves this Trackpad, determining to meet " confirming the detection method that many objects leave ", and this time departure is greater than preset time T
TapLiftThe time, send one and click signal 222, calculate the position that this at least two object is clicked simultaneously, send a position signalling.
Many objects are double-clicked the detection method of gesture (Double Tap)
Figure 15 shows a detection signal 224 and a towing signal 226.When detecting at least two objects and touch Trackpad for the first time, detection signal 224 transfers noble potential to by electronegative potential, as shown in figure 15, and then calculating this object touches the first touching time of this Trackpad and calculates the object number, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this first touching time is less than preset time T
TapDownnJust detect all objects and leave this Trackpad, detection signal 224 transfers electronegative potential to by noble potential, and then calculate the time departure that this at least two object leaves this Trackpad, determining to meet " confirming the detection method that many objects leave ", and at this time departure less than preset time T
ApLiftDetect all objects again and touch this Trackpad for the second time, then detection signal 224 transfers noble potential to by electronegative potential once more, calculate the second touching time of touching this Trackpad for the second time, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this second touching time is less than preset time T
DoubleDownThe time, detect all objects and leave this Trackpad once more, then detection signal 224 transfers electronegative potential to by noble potential, determining to meet " confirming the detection method that many objects leave ", send one and double-click signal 226, a position signalling is sent in the position of calculating this at least two object simultaneously.
The detection method of many object towing gestures (Drag Ges ture)
Figure 16 shows a detection signal 228 and a towing signal 230.When detecting at least two objects and touching Trackpad for the first time, detection signal 228 transfers noble potential to by electronegative potential, as shown in figure 16, and then calculating this at least two object touches the first touching time of this Trackpad and calculates the object number, wherein the object number must be more than or equal to 2, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this first touching time is greater than preset time T
TapDownThe time, detect that at least one leaves this Trackpad in this at least two object, detection signal 228 transfers electronegative potential to by noble potential, meet " confirming the detection method that many objects leave " at the object of determining to leave, and stay object number on the Trackpad greater than 1 o'clock, send a towing signal 230, a position signalling is sent in the position of calculating this object simultaneously.
In each above-mentioned embodiment, utilize the variation of induction amount and default time ratio, can confirm various operations on Trackpad, avoid being subjected to noise jamming and judge by accident.
Claims (5)
1. the multi-object detection method of a capacitive touch control plate comprises:
Detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least; And
During all greater than a critical value, calculate the variable quantity of this induction amount and preceding once detected induction amount at this first and second peak value;
Wherein, if this induction amount is kept the trend of increase in a Preset Time, expression has at least two objects to touch this Trackpad.
2. the method for claim 1 is characterized in that, more comprises:
Calculate the object number of this Trackpad of touching;
When the object number on this Trackpad remains unchanged, calculate the touching time that this at least two object is touched this Trackpad; And
When this touching time reaches one second Preset Time, send a touching signal.
3. method as claimed in claim 2 is characterized in that, after sending described touching signal, also comprises the position of calculating this at least two object, sends a position signalling.
4. the multi-object detection method of a capacitive touch control plate comprises:
After at least two objects are touched this Trackpad, detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least; And
When at least one is less than a critical value in this first and second peak value, calculate the variable quantity of this induction amount;
Wherein, as if the trend of in a Preset Time, keeping minimizing less than this first or second peak value of this critical value, represent that at least one leaves this Trackpad in this at least two object.
5. method as claimed in claim 4 is characterized in that, more comprises:
Calculate the time departure that this at least one object leaves this Trackpad;
When this time departure surpasses one second Preset Time, send one and leave signal; And
The object number on this Trackpad is stayed in calculating;
Wherein,, calculate the position of staying object on this Trackpad, send a position signalling if stay object number on this Trackpad when non-vanishing.
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