# US 12,002,401 B2 · Gamma correction method and apparatus, electronic device, and readable storage medium

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- Number: US 12,002,401 B2
- Document ID: US12002401B2
- Status: Granted
- Kind: B2
- Application number: 18/038,200
- Filed: 2020-12-14
- Published: 2024-04-04
- Granted: 2024-06-04
- Earliest claimed: 2020-12-14
- Assignees: Chengdu Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Chengdu BOE Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd.
- Inventors: Ting Han; Yuanzhang Zhu
- Web page: https://patentgrep.com/patent/US12002401B2

## CPC

- G09G 3/2007: {Display of intermediate tones}
- G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)}
- G09G 3/3225: using an active matrix
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2320/0693: Calibration of display systems
- 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

A gamma correction method and apparatus, electronic device and readable storage medium. The method comprises: controlling a first display area (21) to display a test picture (S11); performing gamma correction on first display area to obtain first gamma correction data (S12); according to first gamma correction data, controlling a second display area (22) to display the test picture (S13); acquiring current display brightness corresponding to the test picture displayed in second display area (S14); when current display brightness is the same as that corresponding to a preset pixel grayscale displayed in first display area, determining remapping parameters of second display area according to grayscale brightness corresponding to second display area when current display brightness is displayed and preset pixel grayscale (S15); according to remapping parameters, compensating first gamma correction data to obtain second gamma correction data (S16); according to second gamma correction data, controlling second display area to display (S17).

## Claims

### Claim 1

A gamma correction method for a display panel, wherein the display panel comprises a first display area and a second display area, a pixel density of the first display area is less than a pixel density of the second display area, and the gamma correction method comprises:
controlling the first display area to display a test picture;
performing gamma correction on the first display area to obtain first gamma correction data;
controlling the second display area to display the test picture according to the first gamma correction data;
acquiring a current display luminance corresponding to the test picture displayed by the second display area;
determining a remapping parameter of the second display area based on a grayscale luminance corresponding to the current display luminance displayed in the second display area and a preset pixel grayscale, when the current display luminance is the same as a display luminance corresponding to the preset pixel grayscale displayed in the first display area;
compensating the first gamma correction data according to the remapping parameter to obtain second gamma correction data; and
controlling the second display area to display according to the second gamma correction data.

### Claim 2 (depends on 1)

The gamma correction method according to claim 1, wherein determining the remapping parameter of the second display area based on the grayscale luminance corresponding to the current display luminance displayed in the second display area and the preset pixel grayscale, comprises:
determining a target pixel grayscale corresponding to the grayscale luminance of the current display luminance displayed in the second display area;
determining the remapping parameter according to a ratio of the target pixel grayscale and the preset pixel grayscale.

### Claim 3 (depends on 2)

The gamma correction method according to claim 2, wherein the target pixel grayscale corresponding to the grayscale luminance of the current display luminance displayed in the second display area is calculated by the following conditional formula:
L
v
⁢
H
-
s
⁢
p
⁢
e
⁢
c
L
v
⁢
i
=
(
Gray
H
-
s
⁢
p
⁢
e
⁢
c
i
)
Gamma
wherein, LvH-spec is the grayscale luminance of the current display luminance displayed in the second display area, Lvi is a grayscale luminance corresponding to the preset pixel grayscale displayed in the first display area, i is a value of the preset pixel grayscale, GrayH-spec is the target pixel grayscale corresponding to the grayscale luminance of the current display luminance displayed in the second display area, and Gamma is a gamma correction parameter value.

### Claim 4 (depends on 1)

The gamma correction method according to claim 1, wherein compensating the first gamma correction data according to the remapping parameter to obtain the second gamma correction data comprises:
compensating a pixel grayscale of the first gamma correction data according to the remapping parameter to obtain the second gamma correction data.

### Claim 5 (depends on 1)

The gamma correction method according to claim 1, wherein controlling the second display area to display according to the second gamma correction data comprises:
controlling the second display area to display according to the second gamma correction data based on a mura compensation algorithm.

### Claim 6 (depends on 1)

The gamma correction method according to claim 1, wherein performing the gamma correction on the first display area to obtain the first gamma correction data comprises:
tuning a plurality of pixel grayscale binding points from a highest pixel grayscale to a lowest pixel grayscale in the first display area respectively to obtain a plurality of grayscale luminances respectively corresponding to the plurality of pixel grayscale binding points;
combining the plurality of pixel grayscale binding points and the grayscale luminances respectively corresponding to the plurality of pixel grayscale binding points to obtain the first gamma correction data.

### Claim 7 (depends on 6)

The gamma correction method according to claim 6, further comprising:
controlling the first display area to display according to the first gamma correction data based on a mura compensation algorithm.

### Claim 8 (depends on 1)

The gamma correction method according to claim 1, wherein the pixel density of the first display area is a half of the pixel density of the second display area.

### Claim 9 (depends on 1)

The gamma correction method according to claim 1, wherein the first display area is provided in an upper middle area of the display panel, or in four corner areas of the display panel.

### Claim 10 (depends on 1)

The gamma correction method according to claim 1, wherein the first gamma correction data refers to data of a conversion correspondence relationship between input voltages and luminances obtained by performing the gamma correction on the first display area.

### Claim 11

A gamma correction apparatus for a display panel, wherein the gamma correction apparatus is electrically connected with a collection apparatus, the display panel comprises a first display area and a second display area, a pixel density of the first display area is less than a pixel density of the second display area, and the gamma correction apparatus comprises:
a processor, configured to control the first display area to display a test picture;
perform gamma correction on the first display area to obtain first gamma correction data;
control the second display area to display the test picture according to the first gamma correction data;
acquire a current display luminance which corresponds to the test picture displayed by the second display area and is collected by the collection apparatus;
determine a remapping parameter of the second display area based on a grayscale luminance corresponding to the current display luminance displayed in the second display area and a preset pixel grayscale, when the current display luminance is the same as a display luminance corresponding to the preset pixel grayscale displayed in the first display area;
compensate the first gamma correction data according to the remapping parameter to obtain second gamma correction data; and
control the second display area to display according to the second gamma correction data.

### Claim 12 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the processor is configured to determine a target pixel grayscale corresponding to the grayscale luminance of the current display luminance displayed in the second display area, and determine the remapping parameter according to a ratio of the target pixel grayscale and the preset pixel grayscale.

### Claim 13 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the processor is configured to compensate a pixel grayscale of the first gamma correction data according to the remapping parameter to obtain the second gamma correction data.

### Claim 14 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the processor is configured to control the second display area to display according to the second gamma correction data based on a mura compensation algorithm.

### Claim 15 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the processor is configured to tune a plurality of pixel grayscale binding points from a highest pixel grayscale to a lowest pixel grayscale in the first display area respectively to obtain a plurality of grayscale luminances respectively corresponding to the plurality of pixel grayscale binding points; and combine the plurality of pixel grayscale binding points and the grayscale luminances respectively corresponding to the plurality of pixel grayscale binding points to obtain the first gamma correction data.

### Claim 16 (depends on 15)

The gamma correction apparatus according to claim 15, wherein the processor is configured to control the first display area to display according to the first gamma correction data based on a mura compensation algorithm.

### Claim 17 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the pixel density of the first display area is a half of the pixel density of the second display area.

### Claim 18 (depends on 11)

The gamma correction apparatus according to claim 11, wherein the first display area is provided in an upper middle area of the display panel, or in four corner areas of the display panel.

### Claim 19 (depends on 1)

An electronic device, comprising a processor and a memory storing a computer program, when the computer program is executed by the processor, the gamma correction method of claim 1 is implemented.

### Claim 20 (depends on 1)

A non-volatile computer-readable storage medium for a computer program, wherein the gamma correction method of claim 1 is implemented when the computer program is executed by one or more processors.