CN-117456871-B - Driving method of display device

CN117456871BCN 117456871 BCN117456871 BCN 117456871BCN-117456871-B

Abstract

The embodiment of the application discloses a driving method of a display device, which comprises the steps of obtaining an intermediate lookup table according to an initial overdrive lookup table, wherein the ratio of overdrive values of the first m columns in the intermediate lookup table to overdrive values of the first m columns in the initial overdrive lookup table is a first preset ratio, the ratio of overdrive values of the last n columns in the intermediate lookup table to overdrive values of the last n columns in the initial overdrive lookup table is a second preset ratio, the first preset ratio and the second preset ratio are both smaller than 1, m is a positive integer smaller than y, providing a j-bit image signal to be displayed, j is a positive integer larger than i, converting the image signal to be displayed into an i-bit target image signal, and searching the overdrive value of the target image signal according to the intermediate lookup table. The problem of water mark defects can thereby be reduced or weakened or even avoided in the present application.

Inventors

DENG SHIJIE
WANG QIAN
CHANG SHUMING
CHEN FAN
LIANG ZHAOMING
WEN YATING
ZHANG YUNING
ZHENG WEISHENG

Assignees

惠州华星光电显示有限公司
TCL华星光电技术有限公司

Dates

Publication Date: 20260512
Application Date: 20231017

Claims (10)

1. A driving method of a display device, comprising: Acquiring an initial overdrive lookup table, wherein the initial overdrive lookup table comprises gray scale data of y rows and y columns arranged in an array, the gray scale data comprises gray scale binding points and corresponding overdrive values, the initial overdrive lookup table supports display of i-bit image signals, y is a positive integer greater than 2, and i is a positive integer greater than 2; According to the initial overdrive lookup table, an intermediate lookup table is obtained, the initial overdrive lookup table and the intermediate lookup table are defined to comprise a dummy diagonal, one end of the dummy diagonal is a 1st row and a 1st column, one side of the dummy diagonal is a gray scale ascending region, and the other side of the dummy diagonal is a gray scale descending region, wherein the ratio of overdrive values of the front m columns of the gray scale ascending region in the intermediate lookup table to overdrive values of the front m columns of the gray scale ascending region in the initial overdrive lookup table is a first preset ratio, the ratio of overdrive values of the rear n columns of the gray scale descending region in the intermediate lookup table to overdrive values of the rear n columns of the gray scale descending region in the initial overdrive lookup table is a second preset ratio, the first preset ratio and the second preset ratio are both smaller than 1, and m is a positive integer smaller than y; providing a j-bit image signal to be displayed, wherein j is a positive integer greater than i; Converting the image signal to be displayed into the i-bit target image signal; and searching the overdrive value of the target image signal according to the intermediate lookup table.
2. The driving method of a display device according to claim 1, wherein m is a positive integer less than or equal to 5, and n is a positive integer less than or equal to 5.
3. The method for driving a display device according to claim 1, wherein the value range of the first predetermined ratio is 0.4-0.6; The value range of the second preset proportion is 0.7-0.9.
4. A driving method of a display device according to claim 3, wherein the first preset ratio is equal to 0.5 and the second preset ratio is equal to 0.8.
5. A driving method of a display device according to claim 1, wherein j is equal to 12 and i is equal to 8.
6. The driving method of the display device according to claim 1, wherein the method of converting the image signal to be displayed into the i-bit target image signal is linear interpolation.
7. The driving method of a display device according to claim 1, wherein the method of acquiring the intermediate lookup table from the initial overdrive lookup table further comprises: Performing linear interpolation calculation on the post s columns of the gray-scale falling region in the intermediate lookup table according to the overdrive values of the first row and the first preset row of the corresponding column of the gray-scale falling region in the intermediate lookup table to obtain a first linear interpolation result, wherein s is a positive integer and is less than or equal to n; And updating the overdrive value of a row between a first head row and a first preset row in the intermediate lookup table according to the first linear interpolation result.
8. The driving method of a display device according to claim 7, wherein the method of acquiring the intermediate lookup table from the initial overdrive lookup table further comprises: Performing linear interpolation calculation on the first r columns of the gray level rising region in the intermediate lookup table according to overdrive values of a second first row and a second preset row of the corresponding columns of the gray level rising region in the intermediate lookup table to obtain a second linear interpolation result, wherein r is a positive integer and is smaller than or equal to m; And updating the overdrive value of the row between the second first row and the second preset row in the intermediate lookup table according to the second linear interpolation result.
9. The method of driving a display device according to claim 8, wherein a gray-scale value of the first preset line is less than or equal to 96, and a gray-scale value of the second preset line is less than or equal to 96.
10. The driving method of a display device according to claim 9, wherein s is equal to 2 or/and r is equal to 2.

Description

Driving method of display device Technical Field The application relates to the field of display, in particular to a driving method of a display device. Background Display panels have been widely used in people's lives, such as display screens of mobile phones, computers, and the like. With the rapid development of the display panel industry, people have put forth other high performance requirements on the display panel besides the requirements on the display panel such as high resolution, wide viewing angle and low power consumption. The larger the panel size is, the higher the refresh rate is, the larger the charging difference of different areas is, the charging effect of each data integrated circuit is inconsistent, and the two sides of each data integrated circuit are difficult to be consistent with the middle charging, and the whole surface is ensured to be uniform. Currently, a Line Over Driver (LOD) algorithm is also used in the industry to improve the problem of image quality uniformity caused by insufficient charging of a panel. Specifically, when the charging voltages of adjacent pixels are inconsistent, an overdrive voltage is used to reduce the influence of the resistance-capacitance (CELL DATA LINE RC) of the panel data line. However, the inventors found that the image displayed by converting a 12-bit (bit) video signal into an 8-bit (bit) video signal and calling an overdrive lookup table corresponding to 8 bits has a phenomenon of water mark defect (water mark mura). Disclosure of Invention The embodiment of the application provides a driving method of a display device, which can solve the problem that after a 12-bit image signal found by an inventor is converted into an 8-bit image signal and an overdrive lookup table corresponding to the 8 bits is called, a displayed image has a phenomenon of water mark defect (water mark mura). The embodiment of the application provides a driving method of a display device, which comprises the following steps: Acquiring an initial overdrive lookup table, wherein the initial overdrive lookup table comprises gray scale data of y rows and y columns arranged in an array, the gray scale data comprises gray scale binding points and corresponding overdrive values, the initial overdrive lookup table supports display of i-bit image signals, y is a positive integer greater than 2, and i is a positive integer greater than 2; The method comprises the steps that an intermediate lookup table is obtained according to the initial overdrive lookup table, the initial overdrive lookup table and the intermediate lookup table are defined to comprise a dummy diagonal, one end of the dummy diagonal is a 1st row and a 1st column, one side of the dummy diagonal is a gray scale ascending area, and the other side of the dummy diagonal is a gray scale descending area; the ratio of the overdrive value of the first m columns of the gray-scale rising area in the intermediate lookup table to the overdrive value of the first m columns of the gray-scale rising area in the initial overdrive lookup table is a first preset ratio, the ratio of the overdrive value of the last n columns of the gray-scale falling area in the intermediate lookup table to the overdrive value of the last n columns of the gray-scale falling area in the initial overdrive lookup table is a second preset ratio, both the first preset ratio and the second preset ratio are smaller than 1, and m is a positive integer smaller than y; providing a j-bit image signal to be displayed, wherein j is a positive integer greater than i; Converting the image signal to be displayed into the i-bit target image signal; and searching the overdrive value of the target image signal according to the intermediate lookup table. Alternatively, in some embodiments of the application, m is a positive integer less than or equal to 5 and n is a positive integer less than or equal to 5. Optionally, in some embodiments of the present application, the value range of the first preset ratio is 0.4 to 0.6, and the value range of the second preset ratio is 0.7 to 0.9. Alternatively, in some embodiments of the present application, the first preset ratio is equal to 0.5 and the second preset ratio is equal to 0.8. Alternatively, in some embodiments of the application, j is equal to 12 and i is equal to 8. Optionally, in some embodiments of the present application, the method of converting the image signal to be displayed into the i-bit target image signal is linear interpolation. Optionally, in some embodiments of the present application, the method for acquiring the intermediate lookup table according to the initial overdrive lookup table further includes: Performing linear interpolation calculation on the post s columns of the gray-scale falling region in the intermediate lookup table according to the overdrive values of the first row and the first preset row of the corresponding column of the gray-scale falling region in the intermediate lookup table to