CN102253750A - Scanning configuration of two-dimensional capacitance sensor and positioning method - Google Patents
Scanning configuration of two-dimensional capacitance sensor and positioning method Download PDFInfo
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- CN102253750A CN102253750A CN2011102069811A CN201110206981A CN102253750A CN 102253750 A CN102253750 A CN 102253750A CN 2011102069811 A CN2011102069811 A CN 2011102069811A CN 201110206981 A CN201110206981 A CN 201110206981A CN 102253750 A CN102253750 A CN 102253750A
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Abstract
The invention relates to a scanning configuration of a two-dimensional capacitance sensor and a positioning method. The scanning configuration has a single layer of electrode groups arranged on one side, wherein each electrode group comprises two touch electrodes, namely a positive touch electrode and a negative touch electrode; and during scanning, one touch electrode in each electrode group serves as a scanning end, and the other touch electrode serves as a reference end. The invention has the advantages that: the scanning configuration and the positioning method are simple; interference caused by outside noises can be effectively prevented; and interference resistance is improved, so coordinates of specific positions of touch points can be quickly and accurately found.
Description
Technical field
The present invention relates to a kind of scanning configuration of sensor, refer in particular to a kind of scanning configuration and localization method of two-dimentional capacitive transducer.
Background technology
So-called two-dimentional capacitive transducer is meant that the principle of utilizing electric capacity transmits a kind of device or the device of signal on directions X and the Y direction, can be the ITO(indium tin oxide) layer, pcb board, keyboard or touch-screen etc., usually by people's finger or pointer actuating.In order to detect the particular location of touch object touching touch-screen, in the scanning configuration of existing two capacitive transducers, generally be according to scanning line by line or by the mode that is listed as, also be each scans delegation or row constantly.In order to characterize the variable quantity that touches the front and back capacitance size, need convert the amount that mimic channel can be differentiated to the capacitance of scan line or row is linear, as time or frequency, and then this amount carried out analog to digital conversion, give the generation that microprocessor judges whether touch transformation result.
Above-mentioned this employing line by line or by row the scanning collocation method, though scan mode is fairly simple, but because extraneous existence is disturbed also variant in the different time periods, so the data of detecting are just not really stable, the operation that finally causes touching is not taken as touch, be not taken as touch and touch, can accurately not judge and whether be touched, when external interference is more serious, even detect the drift of the relative touch point of coordinate, above-mentionedly will directly cause interference free performance poor, produce the action of erroneous judgement.
Therefore need solve above problem for users provide a kind of scanning configuration and localization method of easier two-dimentional capacitive transducer.
Summary of the invention
The actual technical matters to be solved of the present invention is scanning configuration and the localization method that how a kind of interference free performance height is provided, can judges the two-dimentional capacitive transducer of touch object position fast.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of scanning configuration of two-dimentional capacitive transducer, it has the single-layer electrodes group that is laid in a side, described each electrode group includes two touch-control electrodes, positive touch-control electrode and negative touch-control electrode, a touch-control electrode during described scanning in each electrode group is as the scanning end, and then another touch-control electrode is as the reference end.
The invention also discloses the scanning that utilizes above-mentioned two-dimentional capacitive transducer and dispose the localization method that is adopted, its step is as follows: at first, each electrode group of sequential scanning is obtained above-mentioned each data one by one, and asks each data sum; Then, order scans an even numbers electrode group simultaneously one by one, detects the location point coordinate on the Y direction; At last, the data that produce according to position point coordinate on above-mentioned each data sum and the Y direction finally calculate the location point coordinate on the directions X.
The scanning configuration and the localization method of two-dimentional capacitive transducer of the present invention, not only simple, and can effectively restrain the interference that outside noise causes, strengthen anti-interference, thereby find out the particular location coordinate of touch point fast and accurately.
Description of drawings
Fig. 1 is the structure Butut according to single-layer electrodes of the present invention.
Fig. 2 be when touch object moves according to the present invention the induction amount with the variation diagram of position.
Fig. 3 be according to the present invention behind the touch-control induction amount scheme over time.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
The scanning configuration of two-dimentional capacitive transducer involved in the present invention, it has the single-layer electrodes group that is laid in a side is single-layer electrodes, please refer to the wire structures of electrode layer shown in Figure 11, described electrode layer 1 is made up of a plurality of electrode groups 10, described each electrode group 10 all has two touch-control electrodes, is respectively positive touch-control electrode 11 and negative touch-control electrode 12.Described positive touch-control electrode 11 is arranged in opposite directions with described negative touch-control electrode 12, and the electrode on direction is laid in the void area between another direction electrode respectively.
The present invention adopts in the above-mentioned electrode layer 1 during line by line or by column scan, scans two rows or two columns simultaneously at every turn, obtains the electric capacity difference of two rows or two columns then, and above-mentioned capacitance difference Value Data is handled the particular location that finally draws touch object.Specifically: if described electrode layer 1 total n electrode group 10, the described electrode group of sequential scanning one by one then, when scanning for the first time, positive touch-control electrode 11 in first group of electrode 10 is held as scanning S, with the negative touch-control electrode 12 in first group of electrode 10 as holding with reference to R, the all unsettled or equal ground connection of other group electrode 10 this moment, detecting scanning for the first time obtains first group of data X1; When scanning for the second time, positive touch-control electrode 11 in second group of electrode 10 is held as scanning S, as holding with reference to R, this moment, other organized all unsettled or equal ground connection of electrode 10 with the negative touch-control electrode 12 in second group of electrode 10, and detecting scans for the second time and obtains first group of data X2; When scanning for the N time, as scanning S end, as holding with reference to R, all unsettled or equal ground connection of other group electrode 10 this moment is detected the N time scanning and is obtained first group of data Xn with the negative touch-control electrode 12 in the N group electrode 10 with the positive touch-control electrode 11 in the N group electrode 10; The first group of data X1 that calculates above-mentioned acquisition to Xn's and, be formulated as follows:
When touch object is touched above-mentioned capacitive transducer from left to right, with an electrode group is example, as described in Figure 2 the induction amount of will detecting is with the oscillogram of directions X change in location, touch object is when the left side, the induction amount of this moment detecting on the occasion of maximum, with constantly moving to right of touch object, induction measures and has showed negative maximal value.Because the electric capacity that is calculated as scanning S termination electrode of induction poor with reference to the electric capacity of R termination electrode, so touch object is when the leftmost side, scan the contact area maximum of S termination electrode this moment, with reference to the contact area minimum of R termination electrode, so the induction maximum of detecting; With touch object constantly move to right to the centre position time, scanning S termination electrode and equate that with reference to the contact area of R termination electrode the induction that detect this moment is zero; When touch object slid into low order end, scanned the contact area minimum of S termination electrode this moment, and with reference to the contact area maximum of R termination electrode, the induction of detecting this moment is maximum, and is negative value.
Because in the present invention, if calculate the data that produce when the position coordinates of directions X need utilize Y direction detecting position coordinates, so the particular location coordinate after the touch object touching on the Y direction is specifically discussed by following elder generation: the difference measurement electric capacity of principle need introduce to(for) the location point coordinate on the Y direction, so-called difference measurement is meant: after capacitive transducer powers on, sweep trace begins scanning, when touching without any input media, the variation of the capacitance of whole capacitor sensor is tending towards a steady state value, and this steady state value is zero under perfect condition.And when any input equipment such as this capacitive transducer of finger touches, this capacitance will change, after scanning for the first time, when scanning again for the second time, two capacitances of same position have just formed a difference, so just having formed is just having, is having negative capacitance, has promptly finally formed to have minimum and maximum capacitance, finally judges the particular location of touch object in view of the above.
First group of electrode 10 in the above-mentioned electrode layer 1 all held as scanning S, be about to positive touch-control electrode 11 in first group of electrode 10 and negative touch-control electrode 12 and be arranged to conducting at chip internal, this moment, each electrode group 10 was all regarded a rectangle as, die tactic second group of touch-control electrode 10 as holding with reference to R, when scanning for the first time, with all unsettled or equal ground connection of tactic other group electrode; When scanning for the second time, with second group of electrode 10 in the above-mentioned electrode layer 1 all as scanning S end, with tactic the 3rd group of electrode 10 all as holding with reference to R, all unsettled or equal ground connection of other touch-control electrode 10 at this moment; According to above-mentioned scan method, order is finished the scan setting on the Y direction and is obtained data.
Please refer to shown in Figure 3, in the data that above-mentioned scanning Y-axis obtains, form a para-curve, at first detect the data that described electrode group scanning back produces, find out the maximum in the data, the minimum influence value of producing on the sweep trace that described electrode group connected respectively, do further to judge and handle according to the maximum that is obtained, minimum influence value then.Be located on the sweep trace that the electrode group 10 on the described electrode layer 1 connected and all detected data, and maximum influence value M and minimum influence value N have occurred, wherein, maximum influence value M be on the occasion of, minimum influence value N is a negative value; Then judge then with sweep trace that the electrode group is connected on the maximum influence value M that produced whether greater than the positive threshold influence value M0 of preset in advance, whether the minimum influence value N that is produced is less than the negative threshold influence value N0 of preset in advance, whether promptly judge maximum influence value M greater than positive threshold influence value M0, whether minimum influence value N is less than negative threshold influence value N0 simultaneously; If satisfy above-mentioned two conditions, then continue again to check whether pass through zero influence value between above-mentioned maximum, minimum influence value M, the N; If passed through zero influence value between adjacent arbitrarily maximum, minimum influence value M, the N, then show the touch object touching is arranged, and the point that passes through zero influence value is exactly the touch points position coordinates, as can be seen from Figure 3, having only influence value is to have satisfied the condition of passing through zero influence value between the maximum of M and N, the minimum influence value, illustrate that then there is the touch object touching this position, and this position of passing through zero influence value promptly is the position coordinates that touch object is touched described capacitive transducer.
After obtaining the position coordinates on the above-mentioned Y direction, just can determine the position coordinates on the directions X.Concrete grammar is as follows: carry out numerical value behind the integration with first group of data X1 of above-mentioned acquisition to Xn's with divided by the para-curve that the data that position point coordinate on the above-mentioned Y direction produces form, multiply by a constant C again and get final product.Wherein constant C is the constant relevant with resolution, can adjust according to the result.
We have drawn the location point coordinate of touch object on directions X and Y direction by said method, have finally determined the particular location coordinate of touch object.Scanning collocation method of the present invention has not only improved interference free performance, and judges the particular location of touch object fast and accurately.
The present invention is at the coordinate time of judging on the Y direction, adopt and scan two electrode groups simultaneously and obtain the particular location that corresponding data are finally determined sensor, therefore use same principle, scan two particular locations that also should determine sensor with the top electrode group simultaneously, but need an even numbers electrode group this moment, wherein half individual electrode group of even numbers is used for reference electrode, and second half adjacent successively electrode group is as the reference end.So even extraneous the existence under the situation about disturbing also can reduce to the full extent to disturb, so antijamming capability strengthens; And in whole scan setting, above-mentioned introducing with reference to the R end not only is provided with more convenient, and change flexibly, disturbs under the consistent situation with the S end at R, even can get rid of interference; Moreover, localization method of the present invention, not only simple, and can judge the particular location of touch point fast and accurately.
Claims (10)
1. the wire structures of an individual layer ITO is made up of a plurality of positive and negative touch-control electrodes, it is characterized in that: described positive and negative touch-control electrode is arranged in opposite directions, and the electrode on direction is laid in the void area between another direction electrode respectively.
2. wire structures as claimed in claim 1 is characterized in that: the area of described positive and negative touch-control electrode all is alternation trend.
3. wire structures as claimed in claim 2 is characterized in that: one of the area of described positive and negative electrode is and increases progressively trend, another trend that then tapers off.
4. wire structures as claimed in claim 1 is characterized in that: described positive and negative touch-control electrode is formed indentation by ditrigon.
5. wire structures as claimed in claim 1 is characterized in that: described positive and negative touch-control electrode is formed indentation by three triangles.
6. as claim 4 or 5 described wire structures, it is characterized in that: the area of described positive and negative touch-control electrode equates.
7. wire structures as claimed in claim 1 is characterized in that: the electrode of the upper and lower part of described single ITO layer is made up of ditrigon, and the electrode of center section is made up of three triangles.
8. wire structures as claimed in claim 7 is characterized in that: the described positive electrode group of forming by ditrigon and three triangles with by ditrigon and three interlaced arrangements of negative electrode group that triangle is formed.
9. wire structures as claimed in claim 1 is characterized in that: described positive touch-control electrode and negative touch-control electrode all are wired on the respective pins of touch-control chip.
10. the wire structures of stating as claim 1, it is characterized in that: described positive and negative touch-control electrode also can be made up of trapezoidal or arc.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750060A (en) * | 2012-06-04 | 2012-10-24 | 天津昌立微电子技术有限公司 | Projection-type capacitive touch screen system time domain noise reduction method by space differentiation |
| CN103049160A (en) * | 2013-01-25 | 2013-04-17 | 东莞市亚星半导体有限公司 | Multi-touch liquid crystal capacitor screen |
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN105224149A (en) * | 2014-06-06 | 2016-01-06 | 敦泰科技有限公司 | A kind of method for detecting capacitive touch screen |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100295813A1 (en) * | 2009-05-22 | 2010-11-25 | Tyco Electronics Corporation | System and method for a projected capacitive touchscreen having grouped electrodes |
| CN101923419A (en) * | 2010-04-20 | 2010-12-22 | 敦泰科技有限公司 | Self-capacitance touch screen with one-dimensional electrodes and coordinate data processing method thereof |
-
2011
- 2011-07-22 CN CN2011102069811A patent/CN102253750A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100295813A1 (en) * | 2009-05-22 | 2010-11-25 | Tyco Electronics Corporation | System and method for a projected capacitive touchscreen having grouped electrodes |
| CN101923419A (en) * | 2010-04-20 | 2010-12-22 | 敦泰科技有限公司 | Self-capacitance touch screen with one-dimensional electrodes and coordinate data processing method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102750060A (en) * | 2012-06-04 | 2012-10-24 | 天津昌立微电子技术有限公司 | Projection-type capacitive touch screen system time domain noise reduction method by space differentiation |
| CN102750060B (en) * | 2012-06-04 | 2015-06-10 | 天津昌立微电子技术有限公司 | Projection-type capacitive touch screen system time domain noise reduction method by space differentiation |
| CN103049160A (en) * | 2013-01-25 | 2013-04-17 | 东莞市亚星半导体有限公司 | Multi-touch liquid crystal capacitor screen |
| CN103049160B (en) * | 2013-01-25 | 2016-04-06 | 东莞市亚星半导体有限公司 | A kind of liquid crystal capacitance screen of multiple point touching |
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN103902127B (en) * | 2014-04-09 | 2017-03-15 | 泰凌微电子（上海）有限公司 | The localization method and capacitive touch screen of touch location on a kind of capacitive touch screen |
| CN105224149A (en) * | 2014-06-06 | 2016-01-06 | 敦泰科技有限公司 | A kind of method for detecting capacitive touch screen |
| CN105224149B (en) * | 2014-06-06 | 2018-02-16 | 敦泰科技有限公司 | A kind of method for detecting capacitive touch screen |
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Application publication date: 20111123 |