CN102169399A - Method for eliminating ghost point at edge of touch screen - Google Patents
Method for eliminating ghost point at edge of touch screen Download PDFInfo
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- CN102169399A CN102169399A CN2010105604372A CN201010560437A CN102169399A CN 102169399 A CN102169399 A CN 102169399A CN 2010105604372 A CN2010105604372 A CN 2010105604372A CN 201010560437 A CN201010560437 A CN 201010560437A CN 102169399 A CN102169399 A CN 102169399A
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Abstract
The invention relates to a method for eliminating a ghost point at an edge of a touch screen. The method comprises the step of judging the position of the ghost point at the edge by utilizing a method of sensing a relative coordinate value and an absolute coordinate value. Different solutions are effectively provided aiming at the condition of the occurrence of different virtual position points, therefore, the method for eliminating the ghost point at the edge of the touch screen has higher practicability, and is simple and easy to operate; and the influence of the virtual position points can be effectively eliminated and an actual position point is judged accurately and quickly after the touching of multiple fingers.
Description
Technical field
The present invention relates to the method that the ghost point is eliminated on a kind of touch-screen, refer in particular to the method that touch-screen edge ghost point is eliminated.
Background technology
Along with high-speed development of science and technology, snafu variation has taken place in electronic product, appearance along with recent touch electronic product, the touch-control product more and more is subjected to pursuing of people, not only it can save the space, be convenient for carrying, but and the user by finger or pointer etc. direct control just, use comfortable, very convenient.For example, the common personal digital assistant (PDA) of existing market, touch-control class mobile phone, portable notebook computer or the like have all strengthened the input to touch technology, use so touch-control device must have more widely in every field in the future.
At present, capacitance type touch-control panel is because wear-resistant, life-span is long, and on light loss and system behavio(u)r, have more advantage, so capacitance type touch-control panel has been subjected to pursuing of market recently, various capacitance touching control screen products emerge one after another, thereby the principle of work of capacitance type touch-control panel generally is to come the capacitance variations of induction panel to judge the position and the action of finger by a touch-control chip, but when this capacitance type touch control screen of finger touches, a positive induction peak value all can appear in the X sweep trace and the Y sweep trace at finger touch points place, back because the sweep trace of X and Y direction powers on, so if when two fingers are touched described touch screen simultaneously, four intersection points just might appear, certainly, have only two to be real touch point, and in addition two be exactly virtual touch point, promptly so-called terrible point.And the marginal position place of touch-screen generally also has specific function, as controlling rolling of the page etc., so if the situation of touching more than two fingers occurs at the marginal position place, we also need to eliminate the influence of terrible point.
Therefore need solve above problem for users provide a kind of easier method.
Summary of the invention
The actual technical matters to be solved of the present invention is how a kind of terrible point that produces after many finger touches on the touch screen of eliminating is provided.
In order to realize above-mentioned purpose of the present invention, the invention provides the method that the terrible point of a kind of touch-screen edge is eliminated, it may further comprise the steps: (a) the induction peak value that is occurred on each coordinate axis upper tracer of detecting touch-screen edge; (b) be recorded in the position that forms the intersection point place on the touch-screen; (c) other respectively responds to the absolute capacitance values that peak value forms the intersection point place to continue detecting; (d) judge that above-mentioned absolute capacitance values whether in the threshold values scope, if intersection point is arranged in scope, then belongs to terrible point.
Of the present invention on touch screen the method for many finger manipulations time detecting actual touch spots position, overcome tradition and can not accurately judge the problem of pointing physical location, not only this method is at the situation that the different virtual location point occurs, different solutions has effectively been proposed, so practicality is higher, and this method is simple, easy row, and the true location point after many finger touches accurately and is fast judged in the influence that can effectively remove virtual location point.
Description of drawings
Fig. 1 is the structural representation of touch-screen of the present invention;
Fig. 2 is the synoptic diagram that produces corresponding induction amount after touch-screen two finger touches of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
The marginal position place of touch-screen of the present invention is meant touch-screen 1 four marginal positions at touch-screen 1 up and down, please refer to shown in Figure 1ly, and it is set to A, B, four zones of C, D successively.Suppose when the marginal position of any touching object such as finger touch touch-screen 1 is arranged, because finger touches sweep trace place induction amount accordingly all can change, and point all when marginal position more, the induction amount that practical touch point produced will be apparent in view, and the induction amount that virtual ghost point produces can be more weak, finally causes can forming a terrible point on the touch-screen.
Please refer to shown in Figure 2, touch marginal position A simultaneously and position, B place is an example with two fingers, after touch-screen 1 powers on, sweep trace on the touch-screen begins scanning, the situation of change of induction amount on the detecting this moment sweep trace, thus since described touch screen 1 edge A and B place finger touches to the surface sweeping line the positive formation of induction peak value E1, E2, E3 and four oscillograms of E4 all can appear; Whether the maximal value of judging above-mentioned four pairing induction amounts of oscillogram then is less than the preset threshold value; If through judge above-mentioned E1 and E3 the maximal value of corresponding induction amount less than above-mentioned preset threshold value, the intersection point of the induction amount correspondence that then shows E1 and E3 and produced can be ignored.So what the induction peak value that is occurred on the detecting touch-screen edge sweep trace adopted is relative coordinate, and when two fingers touch the A of touch-screen 1 and B zone respectively, only can produce a virtual ghost point So, below our concrete argumentation how to eliminate the influence that ghost is put So.
Because the above-mentioned position of having determined three point of intersection S 1, S2 and So, we calculate each corresponding formed absolute capacitance values by above-mentioned three intersection point places more then, test out this 3 actual capacitance value with respect to the earth.Because the capacitive sensing amount that virtual ghost point produces is littler than the induction amount that finger practical touch place produces certainly, so the absolute capacitance values that tests out the So place is certainly less than pre-set threshold value, and the absolute capacitance values of S1 and S2 illustrates finally that simultaneously greater than pre-set threshold value point of intersection S o is exactly the virtual terrible point that produces.
In like manner, when greater than two touching Object Operations touch screens 1, also can adopt said method, at first, the induction peak value that is occurred on each coordinate axis upper tracer of detecting touch-screen edge; Then, be recorded in the position that forms the intersection point place on the touch-screen; Secondly, other respectively responds to the absolute capacitance values that peak value forms the intersection point place to continue detecting; At last, judge that above-mentioned absolute capacitance values whether in the threshold values scope, if intersection point is arranged in scope, then belongs to terrible point.Just found out the position of touch object touching touch-screen edge practical touch point so.
The method of on touch screen, eliminating the ghost point during many finger manipulations of the present invention, overcome tradition and can not accurately judge the problem of pointing physical location, and this method is simple, easy row, and the true location point of finger accurately and is fast judged in the influence that can effectively remove virtual location point.
Claims (8)
1. a touch-screen edge ghost is put the method for eliminating, and it may further comprise the steps:
(a) the induction peak value that is occurred on each coordinate axis upper tracer of detecting touch-screen edge;
(b) be recorded in the position that forms the intersection point place on the touch-screen;
(c) other respectively responds to the absolute capacitance values that peak value forms the intersection point place to continue detecting;
(d) judge that above-mentioned absolute capacitance values whether in the threshold values scope, if intersection point is arranged in scope, then belongs to terrible point.
2. the method for claim 1 is characterized in that: in described (a) step, if the induction peak value greater than a preset threshold value, is then just carried out (b) step.
3. the method for claim 1 is characterized in that: in described (a) step, if the induction peak value is then respectively responded to the pairing intersection point of peak value and ignored less than a preset threshold value.
4. as claim 2 or 3 described methods, it is characterized in that: described preset threshold value is the numerical value of setting in advance.
5. method as claimed in claim 1 or 2 is characterized in that: in described (c) step, absolute capacitance values is meant the actual capacitance value of described intersection point with respect to the earth.
6. the method for claim 1 is characterized in that: in described (d) step, if intersection point not in the threshold values scope, then is exactly the practical touch point of touch object.
7. as claim 1 or 6 described methods, it is characterized in that: described threshold values is the numerical value of setting in advance.
8. the method for claim 1 is characterized in that: in described (a) step, what the induction peak value that is occurred on the detecting touch-screen edge sweep trace adopted is relative coordinate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105604372A CN102169399A (en) | 2010-11-26 | 2010-11-26 | Method for eliminating ghost point at edge of touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105604372A CN102169399A (en) | 2010-11-26 | 2010-11-26 | Method for eliminating ghost point at edge of touch screen |
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| CN102169399A true CN102169399A (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105604372A Pending CN102169399A (en) | 2010-11-26 | 2010-11-26 | Method for eliminating ghost point at edge of touch screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103246419A (en) * | 2013-04-28 | 2013-08-14 | 肖衣鉴 | Capacitive touch screen and method for judging touch points of touch screen |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825352A (en) * | 1996-01-04 | 1998-10-20 | Logitech, Inc. | Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad |
| CN101105733A (en) * | 2007-05-16 | 2008-01-16 | 广东威创日新电子有限公司 | Multiple point touch localization method |
| CN101763203A (en) * | 2010-01-05 | 2010-06-30 | 苏州瀚瑞微电子有限公司 | Method for detecting multipoint touch control on touch control screen |
-
2010
- 2010-11-26 CN CN2010105604372A patent/CN102169399A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825352A (en) * | 1996-01-04 | 1998-10-20 | Logitech, Inc. | Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad |
| CN101105733A (en) * | 2007-05-16 | 2008-01-16 | 广东威创日新电子有限公司 | Multiple point touch localization method |
| CN101763203A (en) * | 2010-01-05 | 2010-06-30 | 苏州瀚瑞微电子有限公司 | Method for detecting multipoint touch control on touch control screen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103246419A (en) * | 2013-04-28 | 2013-08-14 | 肖衣鉴 | Capacitive touch screen and method for judging touch points of touch screen |
| CN103246419B (en) * | 2013-04-28 | 2016-04-20 | 肖衣鉴 | The method of the judgement touch point of a kind of capacitance touch screen and touch-screen |
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Application publication date: 20110831 |