# US 2021/0240328 A1 · Driving method for touch display panel, and touch display apparatus

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- Number: US 2021/0240328 A1
- Document ID: US20210240328A1
- Status: Published application
- Kind: A1
- Application number: 17/052,304
- Filed: 2020-03-23
- Published: 2021-08-05
- Earliest claimed: 2019-03-27
- Assignees: Beijing Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Beijing Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Inventors: Jinxing LIU; Ming CHEN; Xue DONG; Bo GAO; Wenjia SUN; Xiaozhou LIU; Yannan XIONG; Jiahao LIU; Shaoru ZHANG; Yang CHEN
- Web page: https://patentgrep.com/patent/US20210240328A1

## CPC

- G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/044: by capacitive means
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors}
- G09G 3/3674: {Details of drivers for scan electrodes}
- G09G 2310/0202: Addressing of scan or signal lines
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2354/00: Aspects of interface with display user
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

Disclosed are a driving method for a touch display panel, and a touch display apparatus. The driving method for a touch display panel includes: providing a sinusoidal signal y for each electrode block in a common electrode within a display period, wherein the display period includes N display stages, each display stage has M image frames, the refresh rate of the display period is greater than or equal to a refresh rate threshold value A, N≥2, M≤1, N is a positive integer, M is a positive number, and the refresh rate threshold value A is the maximum refresh rate that can be identified by human eyes; providing a data signal for multiple pixel electrodes; and an electric field, formed by the pixel electrodes and the common electrode, driving the inversion of liquid crystal molecules in a liquid crystal layer.

## Claims

### Claim at position 1

1: A driving method for a touch display panel, wherein the touch display panel comprises a liquid crystal layer, a common electrode, and a plurality of pixel electrodes, the common electrode comprises a plurality of electrode blocks arranged at intervals and insulated from each other, the driving method comprises:
in a display period, providing a sinusoidal signal y to each of the plurality of electrode blocks in the common electrode;
wherein the display period comprises N display stages, each of the display stages comprises M image frames, and a refresh rate of the display period is greater than or equal to a refresh rate threshold A, N≥2, M≤1, N is a positive integer, M is a positive number, and the refresh rate threshold is a maximum refresh rate recognizable by human eyes;
providing data signals to the plurality of the pixel electrodes; and
an electric field formed by the plurality of pixel electrodes and the common electrode driving liquid crystal molecules in the liquid crystal layer to rotate, and the touch display panel displaying.

### Claim at position 2 (depends on 1)

2: The driving method for the touch display panel according to claim 1, wherein, in the display period, providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode comprises: continuously providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode during the entire display period.

### Claim at position 3 (depends on 1)

3: The driving method for the touch display panel according to claim 1, wherein the sinusoidal signal y is a single-frequency sinusoidal signal.

### Claim at position 4 (depends on 1)

4: The driving method for the touch display panel according to claim 1, wherein each of the plurality of electrode blocks serves as a touch electrode to form a self-capacitance with a ground terminal.

### Claim at position 5 (depends on 1)

5: The driving method for the touch display panel according to claim 1, wherein, in the display period, an average luminance value of any sub pixel in the touch display panel is approximately the same as a target luminance value of the sub pixel.

### Claim at position 6 (depends on 3)

6: The driving method for the touch display panel according to claim 3, wherein, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method comprises:
acquiring a central voltage Vh, and upon the central voltage Vh being taken as a voltage of the electrode block in one sub pixel, a luminance value of the sub pixel is taken as the target luminance value of the sub pixel;
wherein the center voltage Vh is a voltage of a symmetrical center of the single-frequency sinusoidal signal.

### Claim at position 7 (depends on 3)

7: The driving method for the touch display panel according to claim 3, wherein, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method further comprises:
acquiring a refresh rate B of one image frame of the touch display panel; and
determining the amount N of the display stages in the display period and the amount M of the image frames in each of the display stages according to the refresh rate B and the refresh rate of the display period.

### Claim at position 8 (depends on 7)

8: The driving method for the touch display panel according to claim 7, wherein, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method further comprises:
acquiring a refresh time t of one image frame according to the refresh rate B of the image frame;
acquiring a voltage difference ΔV1 between a pixel voltage Vp and a common voltage Vcom in each of the display stages according to the refresh time t of the image frame, the sinusoidal function y=A sin (ωt+φ), and the central voltage Vh;
wherein, in one display stage, upon the pixel voltage Vp being positive, the voltage difference is:
ΔV1=|Vp−Vh|−A sin(ω(t0+t×j)+φ);
in a display stage, upon the pixel voltage Vp being negative, the voltage difference is:
ΔV1=|Vp−Vh|+A sin(ω(t0+t×j)+φ);
t0 is a starting time of the single-frequency sinusoidal signal, and t0≥0; t×j is a time of one display stage in the display period, and 0≤j≤C;
acquiring an average luminance value L1 of any sub pixel in the touch display panel in the display period according to the voltage difference ΔV1 in each of the display stages in the display period;
acquiring a voltage difference ΔV2 between the pixel voltage Vp and the center voltage Vh in the display period, and acquiring a target value luminance L2 of any sub pixel in the touch display panel in the display period according to the voltage difference ΔV2;
calculating a frequency set of the single-frequency sinusoidal signal according to L1=L2; and
selecting at least one value from the frequency set as a frequency of the single-frequency sinusoidal signal.

### Claim at position 9 (depends on 8)

9: The driving method for the touch display panel according to claim 8, wherein acquiring the luminance average L1 in the display period of any sub pixel in the touch display panel according to the voltage difference ΔV1 in each of the display stages comprises:
in each of the display stages, acquiring a luminance value of any sub pixel in the touch display panel in the display stage according to the voltage difference ΔV1; and
carrying out weighted average on multiple luminance values of the display stages in the display period to acquire the average luminance L1 in the display period.

### Claim at position 10 (depends on 9)

10: The driving method for the touch display panel according to claim 9, wherein, in each of the display stages, acquiring the luminance value of any sub pixel in the touch display panel in the display stage according to the voltage difference ΔV1 comprises:
in each of the display stages, acquire a function L=H(V) of the voltage difference ΔV1 and the luminance value of the sub pixel by using an electro-optical characteristic curve of the touch display panel; and
calculating the luminance value of any sub pixel in the touch display panel in the display stage according to the function L=H(V).

### Claim at position 11 (depends on 8)

11: The driving method for the touch display panel according to claim 8, wherein selecting at least one value from the frequency set as the frequency of the single-frequency sinusoidal signal comprises:
acquiring a scanning period Ta of each row of sub pixels according to a resolution of the touch display panel;
the frequency of the single-frequency sinusoidal signal is f=kTa/2, k>0, k is an integer.

### Claim at position 12 (depends on 11)

12: The driving method for the touch display panel according to claim 11, wherein the scanning period Ta satisfies a formula: Ta=1/(B×S), in which S is an amount of gate lines for receiving gate scanning signals in an active area of the touch display panel.

### Claim at position 13 (depends on 8)

13: The driving method for the touch display panel according to claim 8, wherein, before acquiring the voltage difference ΔV1 between the pixel voltage Vp and the common voltage Vcom in each of the display stages, the driving method further comprises:
setting an initial phase φ in the sinusoidal function y=A sin(ωt+φ) to zero.

### Claim at position 14 (depends on 9)

14: The driving method for the touch display panel according to claim 9, wherein, before acquiring the voltage difference ΔV1 between the pixel voltage Vp and the common voltage Vcom in each of the display stages, the driving method further comprises:
setting a voltage on the charged pixel electrode at a timing that a transistor connected with the pixel electrode is turned off as the pixel voltage Vp.

### Claim at position 15 (depends on 1)

15: A touch display device, comprising a touch display panel, a memory and a processor, wherein the memory stores a computer program capable of being executed by the processor, and the processor implements the driving method according to claim 1 upon executing the computer program.

### Claim at position 16 (depends on 15)

16: The touch display device according to claim 15, wherein the touch display panel comprises a liquid crystal layer, a common electrode, and a plurality of pixel electrodes; the common electrode comprises a plurality of electrode blocks which are arranged at intervals and insulated from each other;
the touch display device further comprises a driving circuit connected with the processor; the driving circuit comprises a sinusoidal signal driving sub-circuit and a source driving sub-circuit;
the sinusoidal signal driving sub-circuit is electrically connected with the plurality of electrode blocks in the common electrode, and is configured for providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode;
the source driving sub-circuit is electrically connected with the pixel electrodes in respective sub pixels in the touch display panel, and is configured for providing data signals to the plurality of pixel electrodes.

### Claim at position 17 (depends on 16)

17: The touch display device according to claim 16, wherein the driving circuit further comprises a gate driving sub-circuit; the gate driving sub-circuit is connected with a plurality of gate lines of the touch display panel, and is configured for providing gate scanning signals to the plurality of gate lines.

### Claim at position 18 (depends on 1)

18: A computer readable medium, storing a computer program, wherein the computer program implements the method according to claim 1 upon being executed by a processor.

### Claim at position 19 (depends on 2)

19: The driving method for the touch display panel according to claim 2, wherein the sinusoidal signal y is a single-frequency sinusoidal signal.

### Claim at position 20 (depends on 19)

20: The driving method for the touch display panel according to claim 19, wherein, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method comprises:
acquiring a central voltage Vh, and upon the central voltage Vh being taken as a voltage of the electrode block in one sub pixel, a luminance value of the sub pixel is taken as the target luminance value of the sub pixel;
wherein the center voltage Vh is a voltage of a symmetrical center of the single-frequency sinusoidal signal.