CN102156597A - Touch detection system and method - Google Patents
Touch detection system and method Download PDFInfo
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- CN102156597A CN102156597A CN2011100479277A CN201110047927A CN102156597A CN 102156597 A CN102156597 A CN 102156597A CN 2011100479277 A CN2011100479277 A CN 2011100479277A CN 201110047927 A CN201110047927 A CN 201110047927A CN 102156597 A CN102156597 A CN 102156597A
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Abstract
The invention relates to a touch detection system comprising a plurality of bidirectional induction lines and a detection processing system. The detection processing system comprises a programmable analog switch and a comparer. The touch detection system and method disclosed by the invention are simple; in addition, the two induction lines are respectively connected to two input ends of the comparer by utilizing the comparer so as to form a bridge type detection circuit with the function of restraining a common-mode interference. Therefore, even though the interference of an outside environment is large, the influence on the whole system is reduced to the minimum.
Description
Technical field
The present invention relates to a kind of touch control detection field, refer in particular to the touch control detecting method and the capacitance type touch detection system of capacitance type touch-control panel.
Background technology
Now, contact panel is integrated on each electronic product widely as input media, the user only needs to slide on panel or contact with touching object (for example hand with pointer etc.), cursor is produced relatively move or definitely mobile, can finish various inputs such as comprising character calligraph, scrolling form and virtual key.Wherein, capacitance type touch-control panel is a kind of contact panel that moves with the control cursor that moves on level and smooth panel for finger, when the finger touches panel, first sensing direction of institute's touch position and the big young pathbreaker of inductive energy on the second sensing direction produce change, the size by detecting inductive energy can judgment object touch capacitor type Trackpad and calculate the touch position coordinate whether.
In the detection method of existing capacitor-type touch panel, a kind of is the induction matrix that scans simultaneously on the both direction, obtains the electric capacity of this matrix on every line of induction on the both direction then.This detection principle is to obtain the absolute capacitance of every line of induction on the induction matrix simultaneously, and then the data that obtained are handled, system power dissipation height and corresponding circuit complexity in the said method use.Also having a kind of is along a direction sequential scanning line of induction, then the data of every sweep trace is handled, and disturbs but this method is subject to ambient noise.
So how just to seem particularly important for the user provides a kind of simple more detection method.
Summary of the invention
The actual technical matters to be solved of the present invention is how to provide a kind of can prevent noise, the touch control detecting method that system power dissipation is low again.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of touch detection system, it comprises the line of induction and the detecting processing system of some both directions, described detecting processing system comprises programmable analog switch and comparer.
Touch detection system of the present invention and method, not only simple, and utilize comparer that two lines of induction are connected respectively to two input ends of comparer, formed the bridge detection circuit that suppresses common mode interference thus.Even therefore external environmental interference is very big, the influence that total system is subjected to also can be reduced to minimum degree.
Description of drawings
Fig. 1 is the connection diagram of touch control detection circuit of the present invention;
Equivalent circuit diagram when Fig. 2 is touch control detection Circuits System of the present invention work.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
See also shown in Figure 1ly, capacitance touching control detection system of the present invention comprises some lines of induction and the detecting processing system that is configured on the both direction.Described both direction is meant that horizontal direction is that directions X and vertical direction are the Y direction; Described detecting processing system comprises analog switch and comparer.Wherein, described analog switch is meant and can realizes the selectivity closure by programming, so also claim the programmable analog switch.Each line of induction X1, X2...Xn on the described both direction and Y1, Y2...Yn all are connected on the described comparer through behind the described switch of programmable analog separately, and each line of induction itself also can produce inductance capacitance relative to the earth separately.
When there is a pulse in the external world, system starts working, now on line of induction X1 and the X2 whether touch-control is arranged on the hypothesis needs detection directions X, earlier all lines of induction on the Y direction are connected a pulse separately, and all lines of induction on the Y direction are configured to parallel connection, so,, just can apply charging signals to all lines of induction on the Y direction at the rising edge of some moment such as pulse; The programmable analog switch of closed line of induction X1 and X2 makes on its two both positive and negative polarity input ends that are connected respectively to comparer simultaneously, and be one group with respect to the line of induction X1 this moment, and line of induction X2 is another group.Other line of induction X3, X4...Xn on the directions X is unsettled simultaneously, because in the total system, can produce coupling capacitance between the line of induction on the line of induction on the directions X and the Y direction, promptly establishing the coupling capacitance that produces between line of induction X1 and the Y1 is Cx1y, the coupling capacitance that produces between line of induction X2 and the Y2 is Cx2y, and line of induction X1 and X2 itself also can produce a capacitor C x1 and a Cx2 relative to the earth, is similar to equivalent operating circuit shown in Figure 2 so total system just forms.
Detecting described two groups then is that line of induction X1 and X2 export the back electric capacity difference of obtaining through comparer.Continuous input along with pulse, next begins to detect next group constantly is output valve after line of induction group that line of induction X2 and X3 form is connected to two input ends of described comparer respectively, also be to guarantee that other line of induction X1 and X4...Xn are in vacant state this moment, order detects the output valve after line of induction Xn and Xn+1 are connected respectively to two input ends of described comparer successively, and whether finally judge total system has touching object touch-control.
Above-mentioned is at any one group of time detecting electric capacity that all only is provided with a line of induction on the directions X, because any one group on this directions X also can comprise the many lines of induction, and parallel with one another between these many lines of induction, utilize so whether also can judge total system with quadrat method touched.What need assurance is that the Y direction all needs all lines of induction are configured to parallel connection, then it is applied charging signals, and the line of induction of other group is in vacant state simultaneously on the directions X, and total system just can be detected line of induction electric capacity any one group on this directions X by detecting processing system like this.
Refer again to shown in Figure 1, when including two lines of induction in two groups of lines of induction on the directions X, promptly one group comprises two line of induction X1 and X2, another group comprises line of induction X3 and X4, at this moment, other line of induction on the directions X keeps unsettled, and all lines of induction need parallel connection on the Y direction, and it is applied charging signals.Because the end that line of induction X1 in a group and X2 are linked into described comparer simultaneously, and the other end that the line of induction X3 of another group and X4 are linked into described comparer, so finally by behind the detecting processing system output result judge this moment total system whether by touch-control.
Certainly, for one group of the inside the more line of induction being arranged all is same methods, as an input end of comparer as described in also line of induction X1, X2 and X3 can being received then as a group, again with line of induction X4, X5 and X6 as one group of another input end of receiving described comparer then.And the like, use the same method and just can detect the electric capacity difference of two groups of lines of induction forming by any root line of induction, tired no longer one by one stating.
The line of induction that the line of induction in above-mentioned two groups is between adjacent is configured to one group, also can arranged spaced, and get one solely, two even the more lines of induction are configured to one group, as long as configuration mode is symmetrical, just can realize detecting the purpose of touch-control.In like manner, whether the line of induction of detecting if desired on the Y direction has by touch-control, then at first all lines of induction on the directions X to be configured to parallel connection, and it is applied charging signals, again two groups of lines of induction on the Y direction are connected respectively to two input ends of described comparer, the line of induction of other group then is in vacant state on the Y direction, finally exports the result after the disposal system after testing.
Form by the detecting processing system with comparer and some lines of induction owing to touch-control system among the present invention, and two groups of lines of induction all need be connected respectively to two input ends of comparer, so just formed the bridge detection circuit that suppresses common mode interference.So, even external environment has interference, the influence that total system is subjected to also can be reduced to minimum degree.
Claims (10)
1. touch detection system, the line of induction and detecting processing system that it comprises some both directions is characterized in that: described detecting processing system comprises analog switch and comparer.
2. the system as claimed in claim 1 is characterized in that: all be connected on the described comparer behind the described switch of programmable analog separately of described line of induction process.
3. the system as claimed in claim 1 is characterized in that: described analog switch can be realized the selectivity closure by programming.
4. the system as claimed in claim 1, it is characterized in that: the line of induction of described both direction is meant horizontal direction and vertical direction.
5. touch control detecting method that utilizes the described system of claim 1, its step is as follows:
At first, the line of induction on the direction is configured to parallel connection, and it is applied charging signals;
Secondly, the line of induction on the direction to be measured is configured to separate two groups, and obtains the electric capacity difference between these two groups;
At last, the electric capacity difference of two groups of lines of induction on this direction that obtains is handled.
6. method as claimed in claim 5 is characterized in that: the line of induction in described two groups can be each one or two or more.
7. method as claimed in claim 5 is characterized in that: described the line of induction on the direction is applied charging signals can be by realizing to all connecting a pulse on each line of induction.
8. method as claimed in claim 5 is characterized in that: the line of induction in described two groups is connected respectively on two input ends of comparer.
9. method as claimed in claim 5 is characterized in that: the described induction treatment circuit and the described line of induction are formed the bridge detection circuit that suppresses common mode interference.
10. method as claimed in claim 4 is characterized in that: the line of induction group on the described direction to be measured is when test, and other line of induction on this direction is a vacant state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110047927 CN102156597B (en) | 2011-02-28 | 2011-02-28 | Touch detection system and method |
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| CN 201110047927 CN102156597B (en) | 2011-02-28 | 2011-02-28 | Touch detection system and method |
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| CN102156597A true CN102156597A (en) | 2011-08-17 |
| CN102156597B CN102156597B (en) | 2013-05-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389841A (en) * | 2012-05-08 | 2013-11-13 | 禾瑞亚科技股份有限公司 | Sensing method and device for suppressing low-frequency noise interference |
| CN106257836A (en) * | 2015-06-16 | 2016-12-28 | 飞思卡尔半导体公司 | There is built-in constant delayed rail-to-rail comparator |
| CN109669574A (en) * | 2018-12-20 | 2019-04-23 | 芜湖宏景电子股份有限公司 | A kind of anti-misoperation control method of capacitance plate under high humidity environment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201382977Y (en) * | 2008-12-24 | 2010-01-13 | 北京希格玛和芯微电子技术有限公司 | Capacitor measuring device |
| CN101794545A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Display controller, touch detection method and circuit used for same |
-
2011
- 2011-02-28 CN CN 201110047927 patent/CN102156597B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201382977Y (en) * | 2008-12-24 | 2010-01-13 | 北京希格玛和芯微电子技术有限公司 | Capacitor measuring device |
| CN101794545A (en) * | 2009-02-01 | 2010-08-04 | 晨星软件研发(深圳)有限公司 | Display controller, touch detection method and circuit used for same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389841A (en) * | 2012-05-08 | 2013-11-13 | 禾瑞亚科技股份有限公司 | Sensing method and device for suppressing low-frequency noise interference |
| CN106257836A (en) * | 2015-06-16 | 2016-12-28 | 飞思卡尔半导体公司 | There is built-in constant delayed rail-to-rail comparator |
| CN109669574A (en) * | 2018-12-20 | 2019-04-23 | 芜湖宏景电子股份有限公司 | A kind of anti-misoperation control method of capacitance plate under high humidity environment |
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| Publication number | Publication date |
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| CN102156597B (en) | 2013-05-22 |
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