Compensation method and compensation device for display screen as well as display device

Patent metadata

Field	Value
Publication number	US-11176909-B2
Application number	US-201916633026-A
Country	US
Kind code	B2
Filing date	May 28, 2019
Priority date	Nov 8, 2018
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

The present disclosure provides a compensation method, compensation device, and a display device. The compensation method includes: adjusting charging time for multiple areas of the display screen so that the charging time for each area is positively related to a distance from the area to a data voltage input terminal; comparing a first grayscale value before compensation of a sub-pixel in an i-th row and j-th column with a second grayscale value input to a sub-pixel in an (i−1)-th row and j-th column; searching a corresponding grayscale compensation parameter from a grayscale compensation parameter table according to the first grayscale value and the second grayscale value; compensating the first grayscale value by the grayscale compensation parameter to obtain a third grayscale value; and inputting the third grayscale value to the sub-pixel in the i-th row and j-th column for display.

First claim

What is claimed is:

1. A compensation method for a display screen, comprising:
adjusting a charging time for a plurality of areas of the display screen so that the charging time for each area to be charged is positively related to a distance from the each area to a data voltage input terminal of the display screen;
comparing a first grayscale value before compensation of a sub-pixel in an i-th row and j-th column with a second greyscale value input to a sub-pixel in an (i−1)-th row and j-th column, where i and j are both positive integers, and i>1;
searching a grayscale compensation parameter corresponding to the first grayscale value and the second grayscale value from a grayscale compensation parameter table, in a case where the first grayscale value is not equal to the second grayscale value;
compensating the first grayscale value by the grayscale compensation parameter to obtain a third grayscale value; and
inputting the third grayscale value to the sub-pixel in the i-th row and j-th column for display,
wherein, before comparing the first grayscale value with the second grayscale value, the compensation method further comprises: obtaining the grayscale compensation parameter table, wherein the obtaining the grayscale compensation parameter table comprises:
displaying a plurality of grayscale evaluation images by the display screen respectively, and obtaining an initial brightness value and an initial color coordinates of the display screen when each grayscale evaluation image is displayed, thereby obtaining a plurality of initial brightness values and a plurality of initial color coordinates corresponding to the plurality of grayscale evaluation images;
calculating an initial chromaticity of the display screen corresponding to each grayscale evaluation image according to the initial brightness value and the initial color coordinates corresponding to the each grayscale evaluation image;
calculating a chromaticity difference according to the initial chromaticity and a reference chromaticity, for each grayscale evaluation image, so as to obtain a plurality of chromaticity differences corresponding to the plurality of grayscale evaluation images;
obtaining an average value of the chromaticity differences and a maximum value of the chromaticity differences according to the plurality of chromaticity differences;
adjusting a grayscale value corresponding to each grayscale evaluation image input to the display screen, so that the average value of the chromaticity differences after adjustment is not greater than a first threshold and the maximum value of the chromaticity differences after adjustment is not greater than a second threshold;
calculating the grayscale compensation parameter according to the grayscale value after adjustment and the grayscale value before adjustment; and
obtaining the grayscale compensation parameter table according to the grayscale compensation parameter corresponding to each grayscale evaluation image.

2. The compensation method according to claim 1 , wherein before obtaining the grayscale compensation parameter table according to the grayscale compensation parameter corresponding to each grayscale evaluation image, the compensation method further comprises:
fitting a grayscale compensation curve according to a plurality of grayscale compensation parameters corresponding to the plurality of grayscale evaluation images; and
obtaining all grayscale compensation parameters of the display screen according to the grayscale compensation curve.

3. The compensation method according to claim 1 , wherein the initial chromaticity is calculated by a following equation:
L×a×b,

wherein, L is the initial brightness value of the display screen when the display screen displays a grayscale evaluation image, a is an abscissa value of the initial color coordinates when the display screen displays the grayscale evaluation image, and b is an ordinate value of the initial color coordinates when the display screen displays the grayscale evaluation image.

4. The compensation method according to claim 1 , wherein
the grayscale compensation parameter is a difference between the grayscale value after adjustment and the grayscale value before adjustment.

5. The compensation method according to claim 1 , wherein
the first grayscale value is equal to the third grayscale value, in a case where the first grayscale value is equal to the second grayscale value.

6. The compensation method according to claim 1 , wherein
the display screen comprises a plurality of rows of sub-pixels, wherein the sub-pixels in a same row have a same color, and the sub-pixels in the i-th row and the sub-pixels in the (i−1)-th row have different colors.

7. The compensation method according to claim 6 , wherein
the plurality of rows of sub-pixels comprise a plurality of sub-pixel groups, each of the plurality of sub-pixel groups comprises adjacent red, green, and blue sub-pixel rows, and the adjacent red, green, and blue sub-pixel rows in the each of the plurality of sub-pixel groups share one gate driving unit.

8. The compensation method according to claim 1 , wherein all sub-pixels in each area are charged for a same time.

9. A compensation device for a display screen, comprising:
a memory; and
a processor coupled to the memory, wherein the processor is configured to perform the compensation method according to claim 1 based on instructions stored in the memory.

10. A non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the compensation method according to claim 1 .

11. A compensation device for a display screen, comprising:
a time compensation circuit configured to adjust a charging time for a plurality of areas of the display screen so that the charging time for each area to be charged is positively related to a distance from the each area to a data voltage input terminal of the display screen;
a storage circuit configured to store a grayscale compensation parameter table, wherein the grayscale compensation parameter table comprises grayscale compensation parameters;
a grayscale compensation circuit configured to compare a first grayscale value before compensation of a sub-pixel in an i-th row and j-th column with a second grayscale value input to a sub-pixel in an (i−1)-th row and the j-th column, where i and j are both positive integers, and i>1, search a grayscale compensation parameter corresponding to the first grayscale value and the second grayscale value from the grayscale compensation parameter table in a case where the first grayscale value is not equal to the second grayscale value, compensate the first grayscale value by the grayscale compensation parameter to obtain a third grayscale value, and input the third grayscale value to the sub-pixel in the i-th row and j-th column for display,
wherein the display screen is configured to display a plurality of grayscale evaluation images respectively; and
the grayscale compensation circuit is further configured to obtain an initial brightness value and an initial color coordinates of the display screen when each grayscale evaluation image is displayed, thereby obtain a plurality of initial brightness values and a plurality of initial color coordinates corresponding to the plurality of grayscale evaluation images, calculate an initial chromaticity o the display screen corresponding to each grayscale evaluation image according to the initial brightness value and the initial color coordinates corresponding to the each grayscale evaluation image, calculate a chromaticity difference according to the initial chromaticity and a reference ch

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yao Xing
• Han Mingfu
• Shang Guangliang
• Zhu Hao
• Chu Yifang
• Im Yunsik

Classifications

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G3/006

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title

• G09G5/06 Primary

  using colour palettes, e.g. look-up tables · CPC title