CN103713793A - Locating method for self-capacitance type touch screen - Google Patents
Locating method for self-capacitance type touch screen Download PDFInfo
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- CN103713793A CN103713793A CN201310752603.2A CN201310752603A CN103713793A CN 103713793 A CN103713793 A CN 103713793A CN 201310752603 A CN201310752603 A CN 201310752603A CN 103713793 A CN103713793 A CN 103713793A
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Abstract
The invention relates to a locating method for a self-capacitance type touch screen. The locating method for the self-capacitance type touch screen comprises the steps of carrying out module initialization, carrying out starting, carrying out drive scanning of a capacitance digital converter, acquiring collected analog data signals, outputting digital signals through an analog-digital converter, judging whether a single contact or multiple contacts exist, further determining the positions of the contacts, and transmitting obtained contact position information to an upper computer. Compared with the prior art, the locating method for the self-capacitance type touch screen has the advantages that a pressure parameter is introduced to serve as an index of the detection standard, the positions of the contacts can be correctly judged, and the locating method is free of the complex operation process, simple, and easy to implement and popularize.
Description
Technical field
The present invention relates to a kind of touch-screen field of locating technology, specifically a kind of localization method for self-capacitance formula touch-screen.
Background technology
Touch-screen utilizes the feature that its mechanical loss is little and volume is little, has been widely used in each electronic product.Touch-screen comprises electric resistance touch screen and capacitance touch screen.Along with scientific and technological progress, self-capacitance formula touch-screen is more and more widely used in various device.When touching detection, self-capacitance screen detects respectively laterally and longitudinal electrode array successively, according to the variation that touches front and back electric capacity, determines respectively horizontal ordinate and the ordinate of touch location, is then combined into the coordinate of plane.The scan mode of self-capacitance, be equivalent to the touch point on touch-screen to project to respectively X-axis (laterally) and Y-axis (longitudinally) direction, then in X-axis and Y direction, calculate coordinate respectively, be finally combined into the coordinate that touches object (for example finger).
The detection algorithm of tradition based on self-capacitance technology is because the problem of ghost point cannot be supported the detection of true 2, and most gesture operations are all based on 2 detections, this makes the chip of the technology based on self-capacitance at touch-screen, and the application on touch pad is subject to limitation.In traditional detection algorithm based on self-capacitance, if have touch capacitance plate or touch pad at 2, algorithm will find the data of two groups of X and Y-axis, it is respectively (Xa, Xb), (Yn, Ym), these two groups of data can be combined into four coordinate positions, and only having two positions is real touch points, and two other position is so-called terrible point.If cannot distinguish real touch point and terrible point, can occur misjudgment in position fixing process.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is: a kind of localization method for self-capacitance formula touch-screen is provided, introduces the position of another parameter for further judging that real touch point and ghost are put.
In order to address the above problem, the present invention constructs a kind of localization method for self-capacitance formula touch-screen, and the method is:
S1: module initialization;
S2: start and carry out the driven sweep of electric capacity digital quantizer;
S3: gather the analog data signal of collecting;
S4: by analog to digital converter, output digit signals;
S5: judgement is single contact or a plurality of contact;
S6: the position of further determining contact;
S7: the dot position information that goes out obtaining is sent to host computer.
Preferably, the step S2 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S21: electric capacity digital quantizer starts scanning;
S22: drive wire sends driving signal by column;
S23: the line of induction sends induced signal by column;
S24: the driving signal receiving and induced signal are stored in MCU;
S25: multiple scanning N time;
S26: the N group data that are stored in MCU are carried out to average value processing.
Preferably, the step S5 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S51: asking for electric capacity change in count in X-axis and Y-axis is the quantity of the corresponding sensing unit of maximum value;
S52: gained quantity is judged; Criterion is:
When only having the maximum value of an electric capacity change in count in X-axis and Y-axis, be judged as single-point touches;
When having the maximum value of more than one electric capacity change in count in X-axis or Y-axis, be judged as multiple point touching.
Preferably, the step S6 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S61: when there is the situation of single-point touches, the X-axis of record and the coordinate of Y-axis are described contact coordinate;
S62: when there is the situation of multiple point touching, detect the force value of respectively responding to coordinate points;
S63: when force value is greater than threshold value Z, judge that this point is for effective contact, the coordinate that records this point is contact coordinate, otherwise gives up this induction coordinate points.
Preferably, the times N of described multiple scanning is more than or equal to 1.
Preferably, the maximum of described threshold value Z and exterior object institute applied pressure and the touch-screen that uses is born pressure correlation.
Preferably, described exterior object is finger or capacitance pen.
Compared with prior art, tool of the present invention has the following advantages: introduce pressure parameter as an index of examination criteria, can correctly judge contact position, and method do not have complex calculations process, and simple, be easy to promote.
Accompanying drawing explanation
Fig. 1 is the localization method process flow diagram for self-capacitance formula touch-screen of the invention process.
Fig. 2 is electric capacity digital quantizer driven sweep process flow diagram in Fig. 1.
Fig. 3 further determines the process flow diagram of contact position in Fig. 1.
Embodiment
In order to allow those skilled in the art understand better technical scheme of the present invention, below in conjunction with accompanying drawing, the present invention is further elaborated.
As shown in FIG. 1 to 3, a kind of localization method for self-capacitance formula touch-screen, is applied to add the self-capacitance formula touch-screen to pressure-sensitive material to the specific embodiment of the present invention, below take two contacts and describes as example.The concrete steps of the method are as follows:
S1: module initialization;
S2: electric capacity digital quantizer starts scanning;
S3: drive wire sends driving signal by column;
S4: the line of induction sends induced signal by column;
S5: the driving signal receiving and induced signal are stored in MCU;
S6: multiple scanning N time;
S7: the N group data that are stored in MCU are carried out to average value processing.
S8: gather the analog data signal through average value processing;
S9: by analog to digital converter, output digit signals;
S10: asking for electric capacity change in count in X-axis and Y-axis is the quantity of the corresponding sensing unit of maximum value;
S11: gained quantity is judged; Criterion is:
When only having the maximum value of an electric capacity change in count in X-axis and Y-axis, be judged as single-point touches, execution step S12;
When having the maximum value of more than one electric capacity change in count in X-axis or Y-axis, be judged as 2 touches, execution step S13.
S12: when there is the situation of single-point touches, the X-axis of record and the coordinate of Y-axis are described contact coordinate, then perform step S15;
S13: when there is the situation of 2 touches, detect the force value of respectively responding to coordinate points;
S14: when force value is greater than threshold value Z, judge that this point is for effective contact, the coordinate that records this point is contact coordinate, otherwise gives up this induction coordinate points.
S15: the dot position information that goes out obtaining is sent to host computer.
Wherein, the times N of multiple scanning is more than or equal to 1.
Wherein, the maximum of threshold value Z and exterior object institute applied pressure and the touch-screen that uses is born pressure correlation.The maximum of the touch-screen that uses is born pressure, before being dispatched from the factory, carries out pressure test gained by manufacturer.The value of threshold value Z is larger, lower to the False Rate of ghost point, but sensitivity simultaneously also can reduce.Those skilled in the art can be according to its knowhow and product demand, definite threshold Z.
Wherein, exterior object can be finger or capacitance pen etc.
In the present embodiment, only told about the localization method to 2, consistent with the localization method of 2 to the localization method of multiple spot, the coordinate quantity just detecting increases to some extent.
In the present embodiment, the self-capacitance formula touch-screen of mentioning is the self-capacitance formula touch-screen with pressure sensitive function.
The above is better embodiment of the present invention, not the present invention is done to any pro forma restriction.It should be noted that; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (7)
1. for a localization method for self-capacitance formula touch-screen, it is characterized in that, comprise the steps:
S1: module initialization;
S2: start and carry out the driven sweep of electric capacity digital quantizer;
S3: gather the analog data signal of collecting;
S4: by analog to digital converter, output digit signals;
S5: judgement is single contact or a plurality of contact;
S6: the position of further determining contact;
S7: the dot position information that goes out obtaining is sent to host computer.
2. the localization method for self-capacitance formula touch-screen according to claim 1, is characterized in that, the step S2 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S21: electric capacity digital quantizer starts scanning;
S22: drive wire sends driving signal by column;
S23: the line of induction sends induced signal by column;
S24: the driving signal receiving and induced signal are stored in MCU;
S25: multiple scanning N time;
S26: the N group data that are stored in MCU are carried out to average value processing.
3. the localization method for self-capacitance formula touch-screen according to claim 1, is characterized in that, the step S5 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S51: asking for electric capacity change in count in X-axis and Y-axis is the quantity of the corresponding sensing unit of maximum value;
S52: gained quantity is judged; Criterion is:
When only having the maximum value of an electric capacity change in count in X-axis and Y-axis, be judged as single-point touches;
When having the maximum value of more than one electric capacity change in count in X-axis or Y-axis, be judged as multiple point touching.
4. the localization method for self-capacitance formula touch-screen according to claim 1, is characterized in that, the step S6 of the described localization method for self-capacitance formula touch-screen comprises the steps:
S61: when there is the situation of single-point touches, the X-axis of record and the coordinate of Y-axis are described contact coordinate;
S62: when there is the situation of multiple point touching, detect the force value of respectively responding to coordinate points;
S63: when force value is greater than threshold value Z, judge that this point is for effective contact, the coordinate that records this point is contact coordinate, otherwise gives up this induction coordinate points.
5. the localization method for self-capacitance formula touch-screen according to claim 2, is characterized in that, the times N of described multiple scanning is more than or equal to 1.
6. the localization method for self-capacitance formula touch-screen according to claim 4, is characterized in that, the maximum of described threshold value Z and exterior object institute applied pressure and the touch-screen that uses is born pressure correlation.
7. the localization method for self-capacitance formula touch-screen according to claim 6, is characterized in that, described exterior object is finger or capacitance pen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310752603.2A CN103713793A (en) | 2013-12-31 | 2013-12-31 | Locating method for self-capacitance type touch screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310752603.2A CN103713793A (en) | 2013-12-31 | 2013-12-31 | Locating method for self-capacitance type touch screen |
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| CN103713793A true CN103713793A (en) | 2014-04-09 |
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| CN201310752603.2A Withdrawn CN103713793A (en) | 2013-12-31 | 2013-12-31 | Locating method for self-capacitance type touch screen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105447353A (en) * | 2015-11-03 | 2016-03-30 | 广东欧珀移动通信有限公司 | Password input authentication method and system |
| CN106951133A (en) * | 2017-03-30 | 2017-07-14 | 厦门天马微电子有限公司 | Driving method, contact panel and the touch control display apparatus of contact panel |
| CN111060235A (en) * | 2019-12-31 | 2020-04-24 | 北京航空航天大学 | Device and method for detecting static force applied by finger of user and finger shaking |
| CN116243815A (en) * | 2023-05-10 | 2023-06-09 | 惠科股份有限公司 | Touch panel, display module, display device and touch detection method |
-
2013
- 2013-12-31 CN CN201310752603.2A patent/CN103713793A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105447353A (en) * | 2015-11-03 | 2016-03-30 | 广东欧珀移动通信有限公司 | Password input authentication method and system |
| CN105447353B (en) * | 2015-11-03 | 2018-01-16 | 广东欧珀移动通信有限公司 | Password Input verification method and system |
| CN106951133A (en) * | 2017-03-30 | 2017-07-14 | 厦门天马微电子有限公司 | Driving method, contact panel and the touch control display apparatus of contact panel |
| CN111060235A (en) * | 2019-12-31 | 2020-04-24 | 北京航空航天大学 | Device and method for detecting static force applied by finger of user and finger shaking |
| CN111060235B (en) * | 2019-12-31 | 2021-11-05 | 北京航空航天大学 | Device and method for detecting static force applied by finger of user and finger shaking |
| CN116243815A (en) * | 2023-05-10 | 2023-06-09 | 惠科股份有限公司 | Touch panel, display module, display device and touch detection method |
| CN116243815B (en) * | 2023-05-10 | 2023-08-08 | 惠科股份有限公司 | Touch panel, display module, display device and touch detection method |
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Application publication date: 20140409 |