CN116466843A - Method and device for acquiring touch coordinates of spliced capacitive screen - Google Patents
Method and device for acquiring touch coordinates of spliced capacitive screen Download PDFInfo
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- CN116466843A CN116466843A CN202310721517.9A CN202310721517A CN116466843A CN 116466843 A CN116466843 A CN 116466843A CN 202310721517 A CN202310721517 A CN 202310721517A CN 116466843 A CN116466843 A CN 116466843A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008859 change Effects 0.000 claims abstract description 42
- 230000007704 transition Effects 0.000 claims abstract description 20
- 238000010606 normalization Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
The invention discloses a method and a device for acquiring touch coordinates of a spliced capacitive screen, wherein the method comprises the following steps: dividing a spliced capacitive screen into n touch areas according to pattern consistency; for k touch areas with sensing point capacitance change values exceeding a first threshold value, respectively acquiring touch point coordinates P k K is a natural number from 1 to n; setting a transition area with c touch areas, and acquiring the sum value Sc of the touch point coordinates Pc and the capacitance change values of the c touch areas; judging whether the difference between the sum values Sc of the c touch areas exceeds a second threshold value, and if so, carrying out normalization processing on the sum values Sc; the touch point coordinates Pc are used as weights, the touch point coordinates Po of the transition area are obtained by using a weight centroid algorithm, and the weight centroid algorithm is as follows:. The method for acquiring the touch coordinates of the spliced capacitive screen can perfect the spliced capacitanceThe coordinate calculation mode of the screen expands the supporting range of the capacitive screen pattern and improves the accuracy of positioning touch coordinates of the spliced capacitive screen.
Description
Technical Field
The invention relates to the field of capacitive touch control, in particular to a method and a device for acquiring touch coordinates of a spliced capacitive screen.
Background
With the rapid development of electronic products such as smart phones and smart watches, the capacitive touch screen is widely applied, and the application scene of the capacitive touch screen is more complicated with the continuously emerging demands.
The partial special-shaped touch area or touch area is too large, a plurality of known patterns or touch areas are needed to be spliced, the area coordinates are usually calculated by using a fixed weight centroid algorithm, but when the sizes of the spliced and combined patterns are asymmetric, the fixed weight centroid algorithm can lead the final coordinates to deviate to large patterns, so that the coordinate deviation is large and the accuracy is low; or when the combined patterns belong to two different types, such as triangle pattern and grid pattern combination, self-contained pattern and mutual-contained pattern combination, and the like, the fixed weight centroid algorithm cannot calculate the coordinates.
Therefore, it is necessary to provide a method and a device for acquiring the touch coordinates of the spliced capacitive screen, perfecting the coordinate calculation mode of the spliced capacitive screen, expanding the support range of the capacitive screen pattern, and improving the accuracy of positioning the touch coordinates of the spliced capacitive screen.
Disclosure of Invention
The invention aims to provide a method and a device for acquiring touch coordinates of a spliced capacitive screen, which are used for perfecting a coordinate calculation mode of the spliced capacitive screen and improving the accuracy of positioning the touch coordinates of the spliced capacitive screen.
In order to achieve the above object, the present invention provides a method for obtaining touch coordinates of a spliced capacitive screen, including:
dividing the spliced capacitive screen into n touch areas according to pattern consistency, and acquiring a sensing point capacitance change value of an n-th touch area where a touch point is located, wherein n is a natural number not less than 1;
for k touch areas with sensing point capacitance change values exceeding a first threshold value, taking the capacitance change values as weights to acquire touch point coordinates P of the kth touch area k ；
Judging whether the touch points are in a plurality of touch areas, if so, positioning the touch points in a transition area, setting the transition area to have c touch areas, and acquiring touch point coordinates P of the c-th touch area c Sum of capacitance change value S c C is a natural number of 2-k;
judging the sum value S of the c touch areas c Whether the difference between the two values exceeds a second threshold value, if so, the sum value S c Carrying out normalization treatment;
with the touch point coordinates P c For weight, weight centroid algorithm is used to obtainThe touch point coordinates Po of the transition region, and the weight centroid algorithm is as follows:。
optionally, the transition area falls on at least two touch areas having a certain difference in shape or area.
Optionally, the capacitance change value is obtained through a chip.
Optionally, the number of the chips is one or more.
Optionally, one touch area corresponds to one sensing point.
The invention also provides a device for acquiring the touch coordinates of the spliced capacitive screen, which comprises:
a plurality of capacitive screen splices, capacitive screen includes: a capacitance sensing point for converting a touch operation into a capacitance change;
the chip is used for acquiring the value of the capacitance change;
and the coordinate operation module is used for operating the initial coordinates of the touch points and re-operating the coordinates of the touch points falling on a plurality of capacitive screen areas for the capacitive screen areas with the capacitance change value exceeding a first threshold value.
Optionally, the method further comprises: and the normalization module is used for normalizing the capacitance value.
Optionally, the capacitive screen is a projected capacitive screen.
Optionally, the shapes or areas of the plurality of capacitive screens are not all the same.
Optionally, the number of the chips is one or more.
According to the method for acquiring the touch coordinates of the spliced capacitive screen, after the touch point coordinates are initially acquired, in order to avoid the condition that the touch points fall in a plurality of touch areas with larger shape or area difference to generate coordinate calculation result deviation, the touch point coordinates are calculated again by taking the coordinates of the touch points as weights, so that more accurate touch point coordinates are acquired, the coordinate calculation mode of the spliced capacitive screen is perfected, the support range of the capacitive screen pattern is expanded, and the accuracy of positioning the touch coordinates of the spliced capacitive screen is improved.
Drawings
FIG. 1 is a flowchart of a method for acquiring coordinates of a spliced capacitive screen according to an embodiment of the present invention;
FIG. 2 is a block diagram of an apparatus for acquiring coordinates of a tiled capacitive screen according to an embodiment of the present invention;
FIG. 3 is a schematic view of a touch area of a tiled capacitive screen according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of touch point coordinates according to an embodiment of the present invention;
FIG. 5 is a schematic view of touch point coordinates according to another embodiment of the present invention;
FIG. 6 is a graph illustrating deviation data between actual touch point coordinates and theoretical touch point coordinates according to an embodiment of the present invention.
Detailed Description
The method and apparatus for acquiring touch coordinates of a tiled capacitive screen of the present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, it being understood that one skilled in the art can modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for obtaining coordinates of a spliced capacitive screen according to an embodiment of the invention.
The invention provides a method for acquiring coordinates of a spliced capacitive screen, which comprises the following steps:
step S101: dividing the spliced capacitive screen into n touch areas according to pattern consistency, and acquiring a sensing point capacitance change value of an n-th touch area where a touch point is located, wherein n is a natural number not less than 1;
step S102: for k touch areas with sensing point capacitance change values exceeding a first threshold value, taking the capacitance change values as weights to acquire touch point coordinates P of the kth touch area k K is a natural number from 1 to n;
step S103:judging whether the touch points are in a plurality of touch areas, if so, positioning the touch points in a transition area, setting the transition area to have c touch areas, and acquiring touch point coordinates P of the c-th touch area c Sum of capacitance change value S c C is a natural number of 2-k;
step S104: judging the sum value S of the c touch areas c Whether the difference between the two values exceeds a second threshold value, if so, the sum value S c Carrying out normalization treatment;
step S105: with the touch point coordinates P c The touch point coordinates Po of the transition area are obtained by using a weight centroid algorithm as the weight, wherein the weight centroid algorithm is as follows:。
specifically, in step S101, the spliced capacitive screen is divided into n touch areas according to pattern consistency, and after a user touches the capacitive screen, the driving chip obtains capacitance change values of the n touch areas, where the number of chips is one or more, and each touch area has a corresponding sensing point, and the sensing point is used to convert a touch action into capacitance change.
In step S102, k touch areas in which the capacitance change value of the sensing point exceeds the first threshold are extracted from the n touch areas, and the touch point coordinate P of the kth touch area is obtained by taking the capacitance change value as a weight k K is a natural number from 1 to n. The right touch area of the user and the capacitive screen determines the capacitance change value.
In step S103, it is determined whether the touch point is within a plurality of touch areas, and when the touch point is within only one touch area, the touch point P k When the touch point is in a plurality of touch areas, if the plurality of touch areas are formed by a plurality of patterns with large shape or area differences, the touch point coordinates are easy to deviate from the touch areas with large patterns, so that the positioning is inaccurate, and as shown in fig. 3, the touch point positions are offset to a certain extent.
Therefore, when the touch point is within the plurality of touch areas, the transition area is setThe domain has c touch areas, and the touch point coordinates P of the c touch areas are acquired c Sum of capacitance change value S c C is a natural number of 2-k;
in step S104, a sum S of the touch areas of the transition area is determined c Whether the difference between the two exceeds a second threshold value, if so, the sum value S c Carrying out normalization treatment; the capacitance change value is collected by copper columns with the same diameter, if the capacitance change value exceeds a second threshold value, the capacitance change value is proved to have abnormality, a normalization coefficient is deduced according to the abnormal result, and the sum value S of the capacitance change value is calculated c And (5) carrying out normalization processing.
In step S105, the coordinates P of the touch point are used c Touch coordinates of the transition zone are calculated for the weights. For example the sum S of the capacitance change values of the second touch area c S2, touch Point coordinate P c Is P2; sum S of capacitance change values of third touch area c S3, touch Point coordinate P c P3. The calculation formula is as follows:substituting the touch point coordinates P c And (3) acquiring the X and Y values of the touch point coordinates Po, and improving the accuracy of the touch point coordinates. As shown in fig. 5, the touch point position of the present invention is more accurate.
Fig. 3 is a schematic diagram of a touch area of a capacitive screen according to an embodiment of the invention.
In a specific embodiment, the touch areas include a first touch area W1, a second touch area W2, a third touch area W3, a fourth touch area W4, a fifth touch area W5, a sixth touch area W6, a seventh touch area W7, and an eighth touch area W8. When the touch point falls on the W8 and other touch areas at the same time, since the shape or area of any one of the touch area W8 and the touch areas W1 to W7 has a certain difference, when the touch point coordinates are acquired by taking the capacitance change value as the weight, the touch point coordinates will be deviated. The eighth touch area is divided into eight small touch areas with similar shapes, each small touch area is provided with a capacitance sensing point, and touch point coordinates are calculated by splicing the small touch areas with other touch areas according to the specific falling point of the touch point on the eighth touch area W8.
Referring to fig. 6, taking 16 touch areas as an example, each touch area has a sensing point for acquiring capacitance values, when the touch point falls within the plurality of touch areas, deviation data when the touch point coordinates are calculated by the methods of step S101 and step S102 and deviation data when the touch point coordinates are calculated by the methods of step S101, step S102, step S103, step S104 and step S105 are calculated. For example, when the capacitance variation difference combinations of the 16 touch areas are (6,0,13,2,172,1,95,19,83,10,123,0,8,3,3,3), (6,0,10,0,192,0,131,34,99,12,142,1,3,0,3,3), (9,0,18,6,212,1,123,27,102,14,140,0,2,0,1,1), (9,2,19,5,218,2,124,29,100,13,147,0,10,6,1,0) and (11,3,20,7,199,0,121,26,107,18,144,2,8,3,2,2), respectively, the theoretical coordinates are (50,545.33), the touch point coordinates calculated by the methods of step S101 and step S102 are (56.7,508.4), (65.8 506), (61.9,486.8), (71,492.8) and (81.4, 498.8), respectively, and the deviation values are 43.63, 55.13, 70.43, 73.53 and 77.93, respectively, that is, the deviation 1 in fig. 6; after recalculating the touch point coordinates by the methods of step S103, step S104 and step S105, the touch point coordinates result is (49,512), (58,505), (57,506), (64,504) and (64,513), respectively, and the deviation values are 34.33, 48.33, 46.33, 55.33 and 46.33, respectively, that is, the deviation 2 in fig. 6. Of course, when the capacitance variation difference is combined into other data, the theoretical coordinate and the actual calculated coordinate will also change, and fig. 6 shows various capacitance variation differences and deviation value data under the theoretical coordinate.
Obviously, the deviation value of the deviation 2 is smaller than the deviation value of the deviation 1 as a whole, so that the method for acquiring the touch coordinates of the spliced capacitive screen can improve the accuracy of coordinate operation as a whole.
According to the method for acquiring the touch coordinates of the spliced capacitive screen, after the touch point coordinates are initially acquired, in order to avoid the condition that the touch points fall in a plurality of touch areas with larger shape or area difference to generate coordinate calculation result deviation, the touch point coordinates are calculated again by taking the coordinates of the touch points as weights, so that more accurate touch point coordinates are acquired, the coordinate calculation mode of the spliced capacitive screen is perfected, the support range of the capacitive screen pattern is expanded, and the accuracy of positioning the touch coordinates of the spliced capacitive screen is improved.
Referring to fig. 2, fig. 2 is a block diagram of an apparatus for acquiring touch coordinates of a tiled capacitive screen according to an embodiment of the invention.
The invention provides a device for acquiring touch coordinates of a spliced capacitive screen, which comprises the following steps:
a plurality of capacitive screen splices, capacitive screen includes: a capacitance sensing point 201 for converting a touch operation into a capacitance change;
a chip 202 for acquiring the value of the capacitance change;
the coordinate operation module 203 is configured to operate initial coordinates of a touch point for a capacitive screen area where a value of a capacitance change exceeds a first threshold value, and re-operate coordinates of the touch point falling on a plurality of capacitive screen areas.
Specifically, the capacitive screen is a projected capacitive screen, the shapes or areas of the capacitive screens are not all the same, when one or more capacitive screens have large differences with other capacitive screens, the capacitive screen is divided into n touch areas according to the pattern consistency of the capacitive screens, the value of the capacitance change of the n touch areas is detected, the initial coordinate operation of the touch point is performed on the k areas with the value of the capacitance change exceeding the threshold value through the coordinate operation module 203, if the touch point falls in the capacitive screen areas, the coordinate of the touch point is calculated again, and the specific mode of the re-operation is as follows: setting a transition area with c capacitance screen areas, and obtaining the sum S of capacitance change values of the c-th capacitance screen c And the coordinates P c The coordinate of the c-th capacitive screen where the touch point is located is taken as the weight, the touch coordinate of the transition area is calculated, and the calculation formula is as follows:therefore, the situation that the initial coordinates shift to the capacitive screen with larger area or the coordinates cannot be calculated is prevented, and the operation deviation of the coordinates of the touch point is reduced.
And the number of the chips 202 is one or more, when the number of the chips 202 is more than one, the coordinates of the touch points of the spliced capacitive screen are independently operated by the chips 202 respectively, and finally the operation result is transmitted to a main chip, and the coordinate operation module 203 in the embodiment can realize the smooth splicing and transition of the coordinates under the device.
Further, the device for acquiring the touch coordinates of the spliced capacitive screen further comprises: the normalization module is used for carrying out normalization processing on the signal values, reducing the difference of capacitance values and reducing the error rate.
According to the device for acquiring the touch coordinates of the spliced capacitive screen, the coordinate calculation mode of the spliced capacitive screen is perfected by re-calculating the touch coordinates of the transition area on the spliced capacitive screen, the support range of the capacitive screen pattern is expanded, and the accuracy of acquiring the touch point coordinates is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The method for acquiring the touch coordinates of the spliced capacitive screen is characterized by comprising the following steps of:
dividing the spliced capacitive screen into n touch areas according to pattern consistency, and acquiring a sensing point capacitance change value of an n-th touch area where a touch point is located, wherein n is a natural number not less than 1;
for k touch areas with sensing point capacitance change values exceeding a first threshold value, taking the capacitance change values as weights to acquire touch point coordinates P of the kth touch area k K is a natural number from 1 to n;
judging the saidWhether the touch point is in a plurality of touch areas or not, if so, the touch point is positioned in a transition area, c touch areas are arranged in the transition area, and the touch point coordinate P of the c-th touch area is obtained c Sum of capacitance change value S c C is a natural number of 2-k;
judging the sum value S of the c touch areas c Whether the difference between the two values exceeds a second threshold value, if so, the sum value S c Carrying out normalization treatment;
with the touch point coordinates P c The touch point coordinates Po of the transition area are obtained by using a weight centroid algorithm as the weight, wherein the weight centroid algorithm is as follows:。
2. the method of claim 1, wherein the transition area falls at least in two touch areas having a certain difference in shape or area.
3. The method for acquiring touch coordinates of a tiled capacitive screen according to claim 1, wherein the capacitance change value is acquired by a chip.
4. The method for obtaining touch coordinates of a tiled capacitive screen according to claim 3, wherein the number of chips is one or more.
5. The method for obtaining touch coordinates of a tiled capacitive screen according to claim 1, wherein one touch area corresponds to one sensing point.
6. The device for acquiring the touch coordinates of the spliced capacitive screen is characterized by comprising:
a plurality of capacitive screen splices, capacitive screen includes: a capacitance sensing point for converting a touch operation into a capacitance change;
the chip is used for acquiring the value of the capacitance change;
and the coordinate operation module is used for operating the initial coordinates of the touch points and re-operating the coordinates of the touch points falling on a plurality of capacitive screen areas for the capacitive screen areas with the capacitance change value exceeding a first threshold value.
7. The apparatus for obtaining touch coordinates of a tiled capacitive screen of claim 6, further comprising: and the normalization module is used for normalizing the capacitance value.
8. The apparatus for obtaining touch coordinates of a tiled capacitive screen of claim 6, wherein the capacitive screen is a projected capacitive screen.
9. The apparatus for obtaining touch coordinates of a tiled capacitive screen according to claim 6, wherein the plurality of capacitive screens are not all identical in shape or area.
10. The device for acquiring touch coordinates of a tiled capacitive screen according to claim 6, wherein the number of chips is one or more.
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| CN202310721517.9A CN116466843A (en) | 2023-06-19 | 2023-06-19 | Method and device for acquiring touch coordinates of spliced capacitive screen |
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| CN202310721517.9A CN116466843A (en) | 2023-06-19 | 2023-06-19 | Method and device for acquiring touch coordinates of spliced capacitive screen |
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| US20110069036A1 (en) * | 2009-09-18 | 2011-03-24 | Hitachi Displays, Ltd. | Display device |
| CN102830864A (en) * | 2011-06-16 | 2012-12-19 | 比亚迪股份有限公司 | Method used for classifying plurality touch zones of capacitive touch screen, device, and touch system |
| CN104199572A (en) * | 2014-08-18 | 2014-12-10 | 京东方科技集团股份有限公司 | Touch positioning method of touch display device and touch display device |
| US20230134518A1 (en) * | 2021-10-28 | 2023-05-04 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Detector |
| CN116360634A (en) * | 2023-03-28 | 2023-06-30 | 深圳市德明利技术股份有限公司 | Coordinate acquisition method, equipment and medium for touch point group |
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- 2023-06-19 CN CN202310721517.9A patent/CN116466843A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110069036A1 (en) * | 2009-09-18 | 2011-03-24 | Hitachi Displays, Ltd. | Display device |
| CN102830864A (en) * | 2011-06-16 | 2012-12-19 | 比亚迪股份有限公司 | Method used for classifying plurality touch zones of capacitive touch screen, device, and touch system |
| CN104199572A (en) * | 2014-08-18 | 2014-12-10 | 京东方科技集团股份有限公司 | Touch positioning method of touch display device and touch display device |
| US20230134518A1 (en) * | 2021-10-28 | 2023-05-04 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | Detector |
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