Image-quality calibrating method and system and storage medium

Patent metadata

Field	Value
Publication number	US-12469420-B2
Application number	US-202218021859-A
Country	US
Kind code	B2
Filing date	Mar 29, 2022
Priority date	Mar 29, 2022
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

The present disclosure provides an image-quality calibrating method and system and a storage medium. The method includes: when a display screen is displaying a testing image, measuring the actually measured chromaticity coordinate of a target pixel unit in the image; according to a magnitude relation between the actually measured chromaticity coordinate and a standard chromaticity coordinate, by adjusting the pixel component of the target pixel unit, performing coarse adjustment to coordinate values of the actually measured chromaticity coordinate in a first direction and a second direction, and repeatedly performing the coarse adjustment till both of differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate are less than a first preset value.

First claim

The invention claimed is:

1 . An image-quality calibrating method, wherein the method comprises:
when a to-be-tested display screen is displaying a testing image, measuring a chromaticity of a target pixel unit in the testing image, to obtain an actually measured chromaticity coordinate of the target pixel unit; according to a magnitude relation between the actually measured chromaticity coordinate and a standard chromaticity coordinate, by adjusting a pixel component of at least one color channel of the target pixel unit, performing coarse adjustment to coordinate values of the actually measured chromaticity coordinate in a first direction and a second direction, and repeatedly performing the coarse adjustment till both of differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate are less than a first preset value, wherein both of the first direction and the second direction are a chromaticity-coordinate direction; and according to a magnitude relation between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate and a magnitude relation between the differences, by adjusting the pixel component of at least one color channel of the target pixel unit, performing fine adjustment to coordinate values of the actually measured chromaticity coordinate obtained after the coarse adjustment in the first direction and the second direction at a same time, whereby both of differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the fine adjustment and the standard chromaticity coordinate are less than a second preset value, to complete color-temperature calibration of the display screen, wherein the second preset value is less than the first preset value; wherein before the step of measuring the chromaticity of the target pixel unit in the testing image, the method further comprises: when a light-source electric signal of the to-be-tested display screen is preset to be a preset duty cycle, causing the to-be-tested display screen to display the testing image; measuring a peak brightness of the display screen; and when the peak brightness is greater than a first preset brightness, by adjusting downwards a duty cycle of the light-source electric signal, performing preliminary adjustment to the peak brightness, whereby the peak brightness obtained after the preliminary adjustment is less than or equal to the first preset brightness; and after the step of, according to the magnitude relation between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate and the magnitude relation between the differences, by adjusting the pixel component of the at least one color channel of the target pixel unit, performing the fine adjustment to the coordinate values of the actually measured chromaticity coordinate obtained after the coarse adjustment in the first direction and the second direction at the same time, the method further comprises: measuring the peak brightness of the display screen again; and when the peak brightness that has been measured again is greater than or equal to a second preset brightness and less than or equal to a third preset brightness, completing peak-brightness calibration of the display screen, wherein the second preset brightness is less than the third preset brightness, and the third preset brightness is less than the first preset brightness.

2 . The method according to claim 1 , wherein after the step of measuring the peak brightness of the display screen again, the method further comprises:
when the peak brightness that has been measured again is greater than a fourth preset brightness and less than the second preset brightness, by adjusting upwards the duty cycle of the light-source electric signal, performing precise adjustment to the peak brightness, till the peak brightness obtained after the precise adjustment is greater than or equal to the second preset brightness, and less than or equal to the third preset brightness, wherein the fourth preset brightness is less than the second preset brightness; and after the step of measuring the peak brightness of the display screen again, the method further comprises: when the peak brightness that has been measured again is greater than the third preset brightness, by adjusting downwards the duty cycle of the light-source electric signal, performing precise adjustment to the peak brightness, till the peak brightness obtained after the precise adjustment is greater than or equal to the second preset brightness, and less than or equal to the third preset brightness.

3 . The method according to claim 2 , wherein after the step of performing the precise adjustment to the peak brightness, till the peak brightness obtained after the precise adjustment is greater than or equal to the second preset brightness, and less than or equal to the third preset brightness, the method further comprises:
when the peak brightness obtained after the precise adjustment is greater than or equal to the second preset brightness and less than or equal to the third preset brightness, calibrating a color temperature of the display screen again, till it is satisfied that both of the differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the fine adjustment and the standard chromaticity coordinate are less than the second preset value; further measuring the peak brightness of the display screen; and when the peak brightness that has been further measured is greater than or equal to the second preset brightness and less than or equal to the third preset brightness, completing the color-temperature calibration and the peak-brightness calibration.

4 . The method according to claim 1 , wherein the target pixel unit comprises three color channels;
before the step of, according to the magnitude relation between the actually measured chromaticity coordinate and the standard chromaticity coordinate, by adjusting the pixel component of the at least one color channel of the target pixel unit, performing the coarse adjustment to the coordinate values of the actually measured chromaticity coordinate in the first direction and the second direction, and repeatedly performing the coarse adjustment till both of the differences in the first direction and the second direction between the actually measured chromaticity coordinate obtained after the coarse adjustment and the standard chromaticity coordinate are less than the first preset value, the method further comprises: according to the magnitude relation between the actually measured chromaticity coordinate and the standard chromaticity coordinate, determining a processing mode to the target pixel unit; and determining a maintained color channel whose pixel component maintains constant in the processing mode, wherein the other two color channels than the maintained color channel among the three color channels serve as candidate color channels whose pixel values are regulatable in the processing mode; and the step of, according to the magnitude relation between the actually measured chromaticity coordinate and the standard chromaticity coordinate, by adjusting the pixel component of the at least one color channel of the target pixel unit, performing the coarse adjustment to the coordinate values of the actually measured chromaticity coordinate in the first direction and the second direction, and repeatedly performing the coarse adjustment till both of the differences in the first direction and the second direction between the actually measured chromaticity coo

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Wang Xian
• Geng Lihua
• Zhang Ying
• Ma Xitong

Classifications

• G09G2320/0693

  Calibration of display systems · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G2320/0626

  for control of overall brightness · 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

• G09G5/02

  characterised by the way in which colour is displayed {(details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607)} · CPC title