Timing controller, liquid crystal display apparatus and display driving method

Patent metadata

Field	Value
Publication number	US-11250798-B2
Application number	US-202016994217-A
Country	US
Kind code	B2
Filing date	Aug 14, 2020
Priority date	Aug 14, 2019
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A display driving method includes: determining, by a timing controller, an actual grayscale value of a sub-pixel image in an X-th row and a Y-th column according to a preset grayscale value of a sub-pixel image in an (X−1)-th row and the Y-th column and a preset grayscale value of the sub-pixel image in the X-th row and the Y-th column of an image frame to be displayed. The image frame to be displayed includes J rows and Q columns of sub-pixel images. X is greater than or equal to 2, and is less than or equal to J. Y is greater than or equal to 1, and is less than or equal to Q, and X, Y, J, and Q are all integers.

First claim

What is claimed is:

1. A display driving method, comprising:
receiving, by a timing controller, at least one overdrive look-up table, each overdrive look-up table including N rows and M columns of grayscale values, wherein the N rows and M columns of qrayscale values include first theoretical qrayscale values located in a first row of the overdrive look-up table, second theoretical qrayscale values located in a first column of the overdrive look-up table, and actual grayscale values located in remaining positions in the overdrive look-up table; each actual qrayscale value corresponds to a first theoretical qrayscale value and a second theoretical qrayscale value; the at least one overdrive look-up table includes a first overdrive look-up table and a second overdrive look-up table: N and M are all integers greater than 1;
determining, by the timing controller, whether a pulse width modulation signal used to drive at least one light source in a backlight module to emit light is at a high level or a low level;
in response to determining that the pulse width modulation signal is at the high level:
determining, by the timing controller, a position of a first theoretical grayscale value equal to a preset qrayscale value of a sub-pixel image in an (X−1)-th row and a Y-th column of an image frame to be displayed in the first overdrive look-up table, and a position of a second theoretical grayscale value equal to a preset grayscale value of a sub-pixel image in an X-th row and the Y-th column of the image frame to be displayed in the first overdrive look-up table;
determining an actual grayscale value of the sub-pixel image in the X-th row and the Y-th column from the first overdrive look-up table according to the position of the first theoretical qrayscale value and the position of the second theoretical qrayscale value in the first overdrive look-up table; and

in response to determining that the pulse width modulation signal is at the low level:
determining, by the timing controller, a position of a first theoretical qrayscale value equal to the preset grayscale value of the sub-pixel image in the (X−1)-th row and the Y-th column in the second overdrive look-up table, and a position of a second theoretical qrayscale value equal to the preset qrayscale value of the sub-pixel image in the X-th row and the Y-th column in the second overdrive look-up table, and
determining the actual grayscale value of the sub-pixel image in the X-th row and the Y-th column from the second overdrive look-up table according to the position of the first theoretical grayscale value and the position of the second theoretical grayscale value in the second overdrive look-up table, wherein

the image frame to be displayed includes J rows and Q columns of sub-pixel images, X is greater than or equal to 2, and is less than or equal to J, Y is greater than or equal to 1, and is less than or equal to Q, and X, Y, J, and Q are all integers.

2. The display driving method according to claim 1 , further comprising:
updating, by the timing controller, the preset grayscale value of the sub-pixel image in the X-th row and the Y-th column of the image frame to be displayed to the actual grayscale value; and
outputting, by the timing controller, actual grayscale values of all sub-pixel images of the image frame to be displayed to at least one source driver row by row, so that the at least one source driver drives J rows and Q columns of sub-pixels in a display panel row by row according to the actual grayscale values to display an image frame.

3. The display driving method according to claim 1 , wherein
a grayscale value in a first row and a T-th column of the first overdrive look-up table is equal to a grayscale value in a first row and a T-th column of the second overdrive look-up table, T is greater than or equal to 2, and is less than or equal to M, and T is a integer;
a grayscale value in a K-th row and a first column of the first overdrive look-up table is equal to a grayscale value in a K-th row and a first column of the second overdrive look-up table, K is greater than or equal to 2, and is less than or equal to N, and K is an integer; and
an actual grayscale value in the K-th row and the T-th column of the first overdrive look-up table is greater than or equal to an actual grayscale value in the K-th row and the T-th column of the second overdrive look-up table, all actual grayscale values in the first overdrive look-up table are not completely equal, and all actual grayscale values in the second overdrive look-up table are not completely equal.

4. The display driving method according to claim 1 , further comprising:
reading, by the timing controller, the first overdrive look-up table and the second overdrive look-up table from a non-volatile memory when a liquid crystal display apparatus is turned on; and
storing, by the timing controller, the first overdrive look-up table and the second overdrive look-up table in a memory of the timing controller.

5. The display driving method according to claim 1 , wherein after receiving the at least one overdrive look-up table, and before determining the actual grayscale value of the sub-pixel image in the X-th row and the Y-th column, the display driving method further comprises:
determining, by the timing controller, whether the preset grayscale value L X-1 of the sub-pixel image in the (X−1)-th row and the Y-th column is equal to any first theoretical grayscale value in the first row of the overdrive look-up table, and
determining, by the timing controller, whether the preset grayscale value L X of the sub-pixel image in the X-th row and the Y-th column is equal to any second theoretical grayscale value in the first column of the overdrive look-up table.

6. The display driving method according to claim 5 , wherein determining the position of the first theoretical grayscale value equal to the preset grayscale value of the sub-pixel image in the (X−1)-th row and the Y-th column in the overdrive look-up table and the position of the second theoretical grayscale value equal to the preset grayscale value of the sub-pixel image in the X-th row and the Y-th column in the overdrive look-up table, and determining the actual grayscale value of the sub-pixel image in the X-th row and the Y-th column from the overdrive look-up table according to the position of the first theoretical grayscale value and the position of the second theoretical grayscale value, includes:
in response to determining that the preset grayscale value L X-1 of the sub-pixel image in the (X−1)-th row and the Y-th column is not equal to any first theoretical grayscale value, and the preset grayscale value L X of the sub-pixel image in the X-th row and the Y-th column is equal to a second theoretical grayscale value:
selecting a third theoretical grayscale value B1 and a fourth theoretical grayscale value C1 nearest to L X-1 from the first row of the overdrive look-up table, wherein L X-1 is greater than B1, and is less than C1;
determining a position of the third theoretical grayscale value B1 in the overdrive look-up table, a position of the fourth theoretical grayscale value C1 in the overdrive look-up table, and the position of the second theoretical grayscale value in the overdrive look-up table;
determining a first adjustment grayscale value L1 of the sub-pixel image in the X-th row and the Y-th column from the overdrive look-up table according to the position of the third theoretical grayscale value B1 and the position of the second theoretical grayscale value, and a second adjustment grayscale value H1 of the sub-pixel image in the X-th row and the Y-th column from the overdrive look-up according to the position of the fourth theoretical grayscale value C1 and the position of the second theoretical grayscale

Assignees

• Hefei Boe Display Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Wang Jun
• Zhou Liugang
• Liu Jingang
• Dai Ke
• Yin Xiaofeng
• Sun Jianwei
• He Liu
• Qu Zhenlin
• Li Qing
• Liang Yunyun
• Xiong Yulong
• Quan Yu

Classifications

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G2320/0252

  Improving the response speed · CPC title

• G09G3/3406

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title