TWI651634B - Touch coordinate calculation method for touch display driving integrated system and touch display panel using the same to realize touch display function - Google Patents

Abstract

A touch coordinate calculation method for a touch display driving integrated system is implemented by a control circuit, which includes the following steps: finding at least two touch areas and each of the touch areas in a frame of difference data. A peak point, the frame difference data is obtained from the difference between one frame of touch sensing raw data and one frame of non-touch reference raw data; one touch to be compensated in the at least two touch areas Find at least one related touch area that overlaps with it and at least one intersection area with the at least one related touch area; and subtract the difference data of each intersection touch point in each of the intersection areas. Removing at least one influence value of the at least one related touch area, so as to generate one frame of compensated difference data for the touch area to be compensated, wherein the influence value is related to the intersection touch point and a The distance of the peak point of the related touch area is inversely proportional; and a centroid coordinate calculation is performed according to the frame-compensated difference data to generate the barycentric coordinates of the touch area to be compensated. The invention also discloses a touch display panel using the touch coordinate calculation method.

Description

Touch coordinate calculation method for touch display driving integration system and touch display panel using the method to realize a touch display function

The present invention relates to a touch and display drive integration system, and more particularly to a method for calculating touch coordinates.

With the popularity and vigorous development of mobile devices, touch display devices have become one of the indispensable components. In the traditional system architecture, the touch and display functions are controlled independently by the touch chip and the display chip, respectively. The Touch and Display Driver Integration (TDDI) system integrates the touch chip and the display chip by Integrated into a single chip, not only reduces the number of components, makes the screen thinner, but also improves the panel light transmittance, and makes the battery life longer.

Touch display devices mostly use the following touch coordinate calculation method to achieve the purpose: first find the peak point of the touch area, use the peak point as the center to find a connected area where the touch sensing value is greater than a preset threshold, and All touch points in the connected area are subjected to centroid calculation to obtain touch coordinates.

However, when the distance between two or more fingers is closer, the touch sensing value of the intersection touch point between the plurality of peak points will be enhanced, so that the intersection touch when performing the calculation of the center of mass coordinates The weight of the points will increase, resulting in errors between the obtained touch coordinates and the real coordinates, which will affect the user's touch experience.

In order to solve the above problems, a new method for calculating touch coordinates of a touch and display driving integrated system is urgently needed in the art.

The purpose of the present invention is to disclose a touch coordinate calculation method for a touch display driving integrated system, which uses a compensation calculation of the centroid coordinates of the touch areas to make the distance between at least two touch areas close. Improve the accuracy of the centroid coordinate calculation.

In order to achieve the foregoing object, a touch coordinate calculation method for a touch display driving integrated system is proposed, which is implemented by a control circuit and includes the following steps:

Find at least two touch areas and one peak point of each touch area in a frame of difference data, the frame difference data is composed of one frame of touch-sensing raw data and one frame of non-touch reference raw The difference between the data;

Finding at least one related touch area that overlaps with one of the at least two touch areas to be compensated and at least one intersection area with the at least one related touch area;

Subtracting at least one influence value of the at least one relevant touch area from the difference data of each touch point in each of the intersection areas, so that the touch area to be compensated generates a frame-compensated difference Value data, wherein the influence value is inversely proportional to a distance between the intersection touch point and the peak point of a related touch area; and

A centroid coordinate calculation is performed according to the frame-compensated difference data to generate the centroid coordinates of the touch area to be compensated.

In one embodiment, the control circuit has an information processing unit and a memory unit to execute a program.

In one embodiment, the touch area is determined by a plurality of coordinate points of a plurality of difference data that is greater than a threshold in the frame difference data.

In one embodiment, the centroid coordinate calculation includes a weighted average calculation.

In addition, the present invention further provides a touch display panel having a touch display driving circuit and a touch display module, wherein the touch display driving circuit is used to drive the touch display module, and the touch The display driving circuit adopts the aforementioned control circuit to realize the aforementioned touch coordinate calculation method.

In one embodiment, the touch display panel comprises an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an acoustic wave touch display panel, and a capacitive touch panel. A touch display panel selected by a group of display panels.

In order to enable your reviewers to further understand the structure, characteristics, and purpose of the present invention, drawings and detailed descriptions of the preferred embodiments are attached below.

Please refer to FIG. 1, which illustrates a flowchart of an embodiment of a touch coordinate calculation method for a touch and display drive integration system of the present invention, which is implemented using a control circuit, wherein the control circuit is based on an information The processing unit and a memory unit execute a program to implement the touch coordinate calculation method.

As shown in FIG. 1, the touch coordinate calculation method of the touch and display driving integrated system of the present invention includes the following steps:

Find at least two touch areas and one peak point of each touch area in a frame of difference data, the frame difference data is composed of one frame of touch-sensing raw data and one frame of non-touch reference raw (Step a); finding at least one related touch area overlapping with the at least one related touch area in one of the at least two touch areas to be compensated and the at least one related touch area At least one intersection area of the area; (step b); subtracting at least one influence value of the at least one related touch area from the difference data of each intersection touch point in each of the intersection areas, so that the The to-be-compensated touch area generates a frame of compensated difference data, wherein the impact value and the distance between the intersection touch point and the peak point of a related touch area are inversely proportional; (step c) ); And performing a centroid coordinate calculation based on the frame-compensated difference data to generate the centroid coordinates of the touch area to be compensated; (step d).

The touch area is determined by a plurality of coordinate points of a plurality of difference data in the frame difference data that is greater than a threshold, and the calculation of the centroid coordinates includes a weighted average calculation.

Please refer to FIGS. 2a to 2g together, wherein FIG. 2a shows a schematic diagram of three non-overlapping touch areas; FIG. 2b shows a schematic diagram of a frame of non-touch reference raw data; and FIG. 2c shows a touch area including a touch area Schematic diagram of one frame of difference data; Fig. 2d illustrates a diagram of one frame of difference data containing two non-overlapping touch areas; Fig. 2e illustrates a schematic diagram of one frame of difference data containing two overlapping touch areas; Fig. 2f A schematic diagram of the difference data of one frame containing three overlapping touch areas is shown; and FIG. 2g is a schematic diagram of the intersection of the three overlapping touch areas.

If the number of touched areas is less than two or there is no overlap between the two touched areas, no compensation operation is performed. As shown in Figure 2a, where A, B, and C each correspond to three peak points, the three circles represent the touch areas obtained by using the three peak points of A, B, and C as the center, and the three touch areas There are no overlapping intersections with each other, so no compensation calculation is required.

FIG. 2b is a schematic diagram of the touchless reference raw data, and FIG. 2c is a schematic diagram of a frame difference data including a touch area, wherein the frame difference data is a frame of touch sensing raw data and the frame of FIG. 2b The non-touch reference raw data is obtained by a subtraction calculation.

When multiple touch intervals are far away without overlapping intersections, as shown in FIG. 2d, according to the method of the present invention, it can be determined that no compensation operation is required. Conversely, when there are overlapping intersection areas of multiple touch intervals, as shown in FIG. 2e and FIG. 2f, the method of the present invention can determine that it needs to perform a compensation operation.

Take the schematic diagram of the intersection of the three overlapping touch areas as shown in FIG. 2g for explanation. Among them, the four overlapping areas generate four intersection areas including intersection area 1, intersection area 2, intersection area 3, and intersection area 4. The touch area centered on the peak point A has three intersection areas with the touch area centered on the peak point B and the touch area centered on the peak point C, which are intersection area 1, intersection area 2, And intersection area 4, wherein the intersection area centered on the peak point A and the touch area centered on the peak point B is the intersection area 1; the touch area centered on the peak point A and the peak point The intersection area of the touch area centered on C is the intersection area 2; the intersection area of the touch area centered on the peak point A, the touch area centered on the peak point B, and the touch area centered on the peak point C. Department of intersection area 4.

The touch coordinate calculation method of the touch and display driving integrated system of the present invention is to find at least two touch areas and one peak point of each of the touch areas in a frame of difference data, and the at least two In a touch area to be compensated in the touch area, at least one related touch area overlapping with the touch area and at least one intersection area with the at least one related touch area are found, and each intersection in each of the intersection areas is intersected. The difference data of the touch point is subtracted from at least one influence value of the at least one related touch area, so that the frame to be compensated generates difference data after compensation, wherein the influence value is Is inversely proportional to the distance between the intersection touch point and the peak point of a related touch area, and the present invention performs a centroid coordinate calculation based on the frame-compensated difference data to generate the touch to be compensated The centroid coordinates of the hit zone.

Therefore, for the intersection area 1, the present invention subtracts the difference data of the intersection touch points in the intersection area 1 from the impact value of the touch area centered on the peak point B, so that the to-be-compensated The touch area generates a frame of compensated difference data, and the influence value is inversely proportional to the distance between the touch point of each intersection in the intersection area 1 and the peak point B, that is, the influence value is determined by the The product of the reciprocal of the distance and a constant is determined by experiments.

For the intersection area 2, the present invention subtracts the impact value of the touch area centered on the peak point C as the difference data of the intersection touch points in the intersection area 2 to make the touch to be compensated. The area produces one frame of compensated difference data, and the impact value is inversely proportional to the distance between the touch point of each intersection in the intersection area 2 and the peak point C.

For the intersection area 4, the difference data of the intersection touch points in the intersection area 4 is subtracted from the first influence value of the touch area centered on the peak point B and the center value of the peak area C as the center. The second influence value of the touch area, so that the frame to be compensated generates difference data after the touch area to be compensated, and the first influence value is the touch point and peak point B of each intersection in the intersection area 4. And the distance between the second impact value and each intersection point in the intersection area 4 is inversely proportional to the peak point C.

In addition, according to the above description, the present invention further discloses a touch display panel. Please refer to FIG. 3, which illustrates a touch display panel using one of the above-mentioned touch coordinate calculation methods. As shown in FIG. 3, a touch display panel 100 has a touch display driving circuit 110 and a touch display module 120. The touch display driving circuit 110 is used to drive the touch display module 120 to realize A touch display function, and the touch display drive circuit 110 has a control circuit 111 to implement the touch coordinate calculation method of the touch and display drive integration system described above, wherein the control circuit 111 uses an information processing unit 111a and A memory unit 111b executes a program to implement the touch coordinate calculation method. Since driving a touch display module with a touch display driving circuit to realize a touch display function is a conventional technology, no further description of its principle is intended here.

In addition, the touch display panel 100 may be an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, an sonic touch display panel, and a capacitive touch display panel. A touch display panel selected by the group. Since the touch display panels are all known technologies, they are not further described here.

With the previously disclosed design, the present invention can improve the accuracy of the calculation of the centroid coordinate when the distance between at least two touch regions is relatively close by the centroid coordinate compensation operation of the touch regions.

What is disclosed in this case is a preferred embodiment. For example, those who have partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those skilled in the art, do not depart from the scope of patent rights in this case.

To sum up, regardless of the purpose, method and effect, this case is showing its technical characteristics that are quite different from the conventional ones, and its first invention is practical, and it is also in line with the patent requirements of the invention. Granting patents at an early date will benefit society and feel good.

Step a‧‧‧find at least two touch areas and one peak point of each touch area in a frame of difference data, the frame difference data is a frame of touch sensing original data and a frame Derived from the difference in touch-based benchmark raw data

Step b‧‧‧ in at least one touched area to be compensated out of the at least two touched areas to find at least one related touched area overlapping with it and at least one intersection area with the at least one related touched area

Step c‧‧‧ subtracts at least one influence value of the at least one related touch area from the difference data of each touch point in each of the intersection areas, so that the touch area to be compensated generates a Frame-compensated difference data, wherein the impact value and the distance between the intersection touch point and the peak point of a related touch area are inversely proportional

Step d‧‧‧ performs a centroid calculation based on the frame-compensated difference data to generate the centroid coordinates of the touched area to be compensated

100‧‧‧Touch display panel

110‧‧‧Touch display driving circuit

111‧‧‧Control circuit

111a‧‧‧ Information Processing Unit

111b‧‧‧memory unit

120‧‧‧Touch display module

FIG. 1 is a flowchart of an embodiment of a touch coordinate calculation method of a touch and display driving integrated system according to the present invention. FIG. 2a is a schematic diagram of three non-overlapping touch areas. FIG. 2b is a schematic diagram of a frame of touchless reference raw data. FIG. 2c is a schematic diagram of difference data of a frame including a touch area. FIG. 2d is a schematic diagram of difference data of a frame including two non-overlapping touch areas. FIG. 2e is a schematic diagram of difference data of a frame including two overlapping touch areas. FIG. 2f is a schematic diagram of difference data of a frame including three overlapping touch areas. FIG. 2g illustrates the intersection of three overlapping touch areas. FIG. 3 is a block diagram of a touch display panel using one of the touch coordinate calculation methods of the present invention.

Claims (6)

A touch coordinate calculation method for a touch display driving integrated system is implemented by a control circuit, which includes the following steps: finding at least two touch areas and each of the touch areas in a frame of difference data. A peak point, the frame difference data is obtained from the difference between one frame of touch sensing raw data and one frame of non-touch reference raw data; one touch to be compensated in the at least two touch areas Find at least one related touch area that overlaps with it and at least one intersection area with the at least one related touch area; a difference corresponding to each intersection touch point in each of the intersection areas Value data minus at least one influence value of the at least one related touch area, so that the touch area to be compensated generates one frame of compensated difference data, wherein the influence value is the intersection touch point It is inversely proportional to the distance of the peak point of a related touch area; and a centroid coordinate calculation is performed according to the frame-compensated difference data to generate the barycentric coordinates of the touch area to be compensated. According to the touch coordinate calculation method for a touch display driving integrated system described in item 1 of the scope of the patent application, wherein the control circuit has an information processing unit and a memory unit to execute a program. The touch coordinate calculation method for a touch display driving integrated system according to item 1 of the scope of the patent application, wherein the touch area is a complex number of a plurality of difference data which is greater than a threshold value in the frame difference data. Coordinate points are determined. The touch coordinate calculation method for a touch display driving integrated system according to item 1 of the scope of the patent application, wherein the calculation of the center of mass coordinates includes a weighted average calculation. A touch display panel having a touch display driving circuit and a touch display module, wherein the touch display driving circuit is used to drive the touch display module, and the touch display driving circuit includes an application for a patent The control circuit according to any one of items 1 to 4 to implement the touch coordinate calculation method for a touch display driving integrated system. The touch display panel according to item 5 of the patent application scope, wherein the touch display panel comprises an optical touch display panel, a resistive touch display panel, an electromagnetic touch display panel, and an acoustic wave type display panel. A touch display panel selected by a group consisting of a touch display panel and a capacitive touch display panel.