# US 12,112,675 B2 · Display panel grayscale compensation method, grayscale compensation device, and grayscale compensation system

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- Number: US 12,112,675 B2
- Document ID: US12112675B2
- Status: Granted
- Kind: B2
- Application number: 17/287,541
- Filed: 2021-04-16
- Published: 2024-01-11
- Granted: 2024-10-08
- Earliest claimed: 2021-03-31
- Applicants: Tcl China Star Optoelectronics Technology Co., Ltd.
- Inventors: Yuhua Chang; Wenli Wang
- Web page: https://patentgrep.com/patent/US12112675B2

## CPC

- G09G 3/2007: {Display of intermediate tones}
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
- G09G 2320/0626: for control of overall brightness
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- G09G 2320/0693: Calibration of display systems
- G09G 2360/145: the light originating from the display screen
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- 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

The present invention discloses a display panel grayscale compensation method, a grayscale compensation device, and a grayscale compensation system. The grayscale compensation method, by acquiring at least one set of image data corresponding to bonding point grayscale values of the display panel, and by dividing the display panel into a main display region and sub-display regions through the image data, can determine grayscale compensation values corresponding to pixels in the sub-display region according to the average gamma value of each sub-display region, which can increase precision of a single grayscale compensation of the pixels in the display panel.

## Claims

### Claim 1

A display panel grayscale compensation method, comprising:
acquiring at least one set of image data corresponding to bonding point grayscale values of pixels of the display panel;
dividing the display panel into a main display region and at least one sub-display region according to the image data and acquiring an average gamma value of each of the least one sub-display region; and
determining a grayscale compensation value corresponding to the bonding point grayscale value of any one of the pixels in the at least one sub-display region based on the average gamma value of each of the least one sub-display region;
wherein the step of acquiring at least one set of image data corresponding to bonding point grayscale values of pixels of the display panel comprises:
determining a plurality of bonding point grayscale values of the display panel;
acquiring a set of image data, wherein the image data comprises pixel data of each pixel based on each of the bonding point grayscale values; and
determining a pixel brightness value and a pixel coordinate of the pixel data;
wherein the step of dividing the display panel into a main display region and at least one sub-display region according to the image data and acquiring the average gamma value of each of the least one sub-display region comprises:
determining a first brightness difference threshold value among pixels in the image data; and
dividing the display panel as the main display region and the at least one sub-display region based on the first brightness difference threshold value and the pixel coordinate;
wherein the step of dividing the display panel into a main display region and at least one sub-display region according to the image data and acquiring the average gamma value of each of the least one sub-display region further comprises:
fitting a brightness-grayscale relationship curve based on pairs of the bonding point grayscale values and pixel brightness values of a same pixel;
determining a gamma value of each pixel according to the brightness-grayscale relationship curve; and
calculating the average gamma value of the at least one sub-display region based on the gamma value and the pixel coordinate of each pixel.

### Claim 2 (depends on 1)

The grayscale compensation method as claimed in claim 1, wherein the step of determining a grayscale compensation value corresponding to the bonding point grayscale value of each pixel in the at least one sub-display region based on the average gamma value of each of the least one sub-display region comprises:
acquiring the average gamma value in the at least one sub-display region according to the gamma value of each pixel in the at least one sub-display region;
determining a first actual grayscale value corresponding to the pixel brightness value of each pixel based on the brightness-grayscale relationship curve and the average gamma value;
determining a target grayscale value based on the brightness-grayscale relationship curve, wherein the target grayscale value is a second actual grayscale value corresponding to the bonding point grayscale value of each pixel in the main display region; and
determining the grayscale compensation value according to a difference result between the second actual grayscale value and the first actual grayscale value.

### Claim 3 (depends on 2)

The grayscale compensation method as claimed in claim 2, wherein the step of determining a first actual grayscale value corresponding to the pixel brightness value of each pixel based on the brightness-grayscale relationship curve and the average gamma value comprises:
determining the at least one sub-display region in which the pixel is located according to the pixel coordinate of the pixel;
determining the average gamma value of the at least one sub-display region as the average gamma value of the pixel; and
acquiring the first actual grayscale value of each pixel based on the brightness-grayscale relationship curve and the average gamma value of the pixel.

### Claim 4 (depends on 1)

The grayscale compensation method as claimed in claim 1, wherein after the step of determining a grayscale compensation value corresponding to the bonding point grayscale value of any one of the pixels in the at least one sub-display region based on the average gamma value of each of the least one sub-display region, the method further comprises:
acquiring a grayscale compensation table corresponding to the bonding point grayscale value based on the grayscale compensation value corresponding to the bonding point grayscale value of any one of the pixels in the at least one sub-display region; and
burning the grayscale compensation table into the display panel.

### Claim 5 (depends on 1, 4)

The grayscale compensation method as claimed in claim 4, wherein after the step of burning the grayscale compensation table into the display panel, the method further comprises:
acquiring image data corresponding to the grayscale compensation table;
evaluating a grayscale compensation effect of the display panel; wherein
if the grayscale compensation effect conforms to an expected compensation effect, terminating the grayscale compensation method, wherein the expected compensation effect is that a difference between the pixel brightness value of one of the pixels in the at least one sub-display region and the pixel brightness value of another of the pixels in the main display region is less than or equal to a second brightness difference threshold value;
if the grayscale compensation effect fails to conform to the expected compensation effect, repeating the grayscale compensation method as claimed in claim 1.