IP Library › Granted Patent US 11,908,379

Granted Patent B2

US 11,908,379 · App. 17/631,668 · Granted Feb 20, 2024

Color temperature self-calibration system and color temperature calibration method

Inventor: Xian Wang (Beijing, CN)

Assignee: BOE TECHNOLOGY GROUP CO., LTD.

G09G3/2096 G09G2300/0452 G09G2320/0242 G09G2320/0666 G09G2330/021

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Quick Facts

Patent No.: US 11,908,379
App. No.: 17/631,668
Granted: Feb 20, 2024
Kind: B2

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Abstract

A color temperature calibration method includes: making a display screen display a test image at a target color temperature; measuring a chromaticity of a target pixel in the display screen to obtain measured color coordinates of the target pixel; comparing the measured color coordinates with standard color coordinates; if differences between the measured color coordinates and the standard color coordinates are greater than a target threshold, adjusting at least one of pixel values of the target pixel, until differences between re-obtained measured color coordinates and the standard color coordinates are not greater than the target threshold; and if differences between the measured color coordinates and the standard color coordinates are not greater than the target threshold, ending the color temperature calibration.

Claims (150)

1. A color temperature self-calibration system, comprising:

a colorimeter; and

a display terminal, the display terminal including the display screen, a memory, and one or more processors, wherein

the display screen is configured to display the test image;

the colorimeter is configured to measure the chromaticity of the target pixel in the display screen, and transmit obtained measured color coordinates of the target pixel to the one or more processors;

the memory stores one or more programs; and the one or more processors read the one or more programs stored in the memory to perform a color temperature calibration method, comprising:

making a display screen display a test image at a target color temperature;

measuring a chromaticity of a target pixel in the display screen to obtain measured color coordinates of the target pixel;

comparing the measured color coordinates with standard color coordinates;

if differences between the measured color coordinates and the standard color coordinates are greater than a target threshold, adjusting at least one of pixel values of the target pixel, until differences between re-obtained measured color coordinates and the standard color coordinates are not greater than the target threshold; and

if differences between the measured color coordinates and the standard color coordinates are not greater than the target threshold, ending the color temperature calibration,

wherein: the measured color coordinates include a measured coordinate in a first direction and a measured coordinate in a second direction, and the standard color coordinates includes a standard coordinate in the first direction and a standard coordinate in the second direction; and

comparing the measured color coordinates with the standard color coordinates, includes: comparing the measured coordinate in the first direction with the standard coordinate in the first direction, and comparing the measured coordinate in the second direction with the standard coordinate in the second direction, wherein

the differences between the measured color coordinates and the standard color coordinates being greater than the target threshold, includes that: a difference between the measured coordinate in the first direction and the standard coordinate in the first direction is greater than the target threshold, and a difference between the measured coordinate in the second direction and the standard coordinate in the second direction is greater than the target threshold,

wherein: the target pixel includes a first sub-pixel, a second sub-pixel and a third sub-pixel of different colors; and

adjusting the at least one of the pixel values of the target pixel, includes: adjusting at least one of a pixel value of the first sub-pixel, a pixel value of the second sub-pixel, and a pixel value of the third sub-pixel, according to which of the measured coordinate in the first direction and the standard coordinate in the first direction is greater, and which of the measured coordinate in the second direction and the standard coordinate in the second direction is greater, includes:

determining whether the measured coordinate in the first direction is greater than the standard coordinate in the first direction, and whether the measured coordinate in the second direction is greater than the standard coordinate in the second direction;

if it is determined that the measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the measured coordinate in the second direction is greater than the standard coordinate in the second direction, keeping the pixel value of the third sub-pixel unchanged, and adjusting pixel values of the first sub-pixel and the second sub-pixel based on a first adjustment mode; and

if it is determined that the measured coordinate in the first direction is not greater than the standard coordinate in the first direction, and/or the measured coordinate in the second direction is not greater than the standard coordinate in the second direction, keeping the pixel value of the first sub-pixel unchanged, and adjusting pixel values of the third sub-pixel and the second sub-pixel based on a second adjustment mode,

wherein adjusting the pixel values of the first sub-pixel and the second sub-pixel based on the first adjustment mode includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than a first threshold;

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is not less than the first threshold, decreasing the pixel value of the first sub-pixel, re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the first sub-pixel is adjusted, and determining the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction, until the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold; and

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold, decreasing the pixel value of the second sub-pixel, re-obtaining a measured coordinate in the second direction corresponding to the target pixel of which the pixel value of the second sub-pixel is adjusted, and determining the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction, until the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than a second threshold.

2. A color temperature calibration method, comprising:

making a display screen display a test image at a target color temperature;

measuring a chromaticity of a target pixel in the display screen to obtain measured color coordinates of the target pixel;

comparing the measured color coordinates with standard color coordinates;

if differences between the measured color coordinates and the standard color coordinates are not greater than the target threshold, ending the color temperature calibration,

wherein: the target pixel includes a first sub-pixel, a second sub-pixel and a third sub-pixel of different colors; and

wherein adjusting the pixel values of the first sub-pixel and the second sub-pixel based on the first adjustment mode includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than a first threshold;

3. The color temperature calibration method according to claim 1 , further comprising:

if it is determined that the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than the second threshold, comparing a measured coordinate in the first direction in a current state with the standard coordinate in the first direction;

if it is determined that a difference between the measured coordinate in the first direction in the current state and the standard coordinate in the first direction is not less than the second threshold, determining whether the measured coordinate in the first direction in the current state is greater than the standard coordinate in the first direction;

if it is determined that the measured coordinate in the first direction in the current state is greater than the standard coordinate in the first direction, decreasing the pixel value of the first sub-pixel;

if it is determined that the measured coordinate in the first direction in the current state is less than the standard coordinate in the first direction, increasing the pixel value of the first sub-pixel;

re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the first sub-pixel is adjusted; and

determining a difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction, until the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the second threshold, wherein

the first threshold is greater than the second threshold, and the target threshold is less than or equal to the second threshold.

4. The color temperature calibration method according to claim 3 , further comprising:

if it is determined that the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the second threshold, adjusting the pixel values of the first sub-pixel and the second sub-pixel based on a first sub-adjustment mode;

re-obtaining measured color coordinates corresponding to the target pixel of which the pixel values of the first sub-pixel and the second sub-pixel are adjusted;

determining differences between the re-obtained measured color coordinates and the standard color coordinates, until a difference between a re-obtained measured coordinate in the first direction in the re-obtained measured color coordinates and the standard coordinate in the first direction is not greater than a third threshold, and/or a difference between a re-obtained measured coordinate in the second direction in the re-obtained measured color coordinates and the standard coordinate in the second direction is not greater than the third threshold; and

ending the color temperature calibration, wherein

the second threshold is greater than the third threshold, and the target threshold is not less than the third threshold.

5. The color temperature calibration method according to claim 4 , wherein the first sub-adjustment mode includes:

if the re-obtained measured coordinate in the first direction is less than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is less than the standard coordinate in the second direction, increasing the pixel values of the first sub-pixel and the second sub-pixel;

if the re-obtained measured coordinate in the first direction is less than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is greater than the standard coordinate in the second direction, increasing the pixel value of the first sub-pixel or decreasing the pixel value of the second sub-pixel;

if the re-obtained measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is less than the standard coordinate in the second direction, decreasing the pixel value of the first sub-pixel or increasing the pixel value of the second sub-pixel; and

if the re-obtained measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is greater than the standard coordinate in the second direction, decreasing the pixel values of the first sub-pixel and the second sub-pixel.

6. The color temperature calibration method according to claim 2 , wherein adjusting the pixel values of the third sub-pixel and the second sub-pixel based on the second adjustment mode includes:

if the measured coordinate in the first direction is less than the standard coordinate in the first direction, and the measured coordinate in the second direction is less than the standard coordinate in the second direction, performing a first method;

if the measured coordinate in the first direction is less than the standard coordinate in the first direction, and the measured coordinate in the second direction is greater than the standard coordinate in the second direction, performing a second method; and

if the measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the measured coordinate in the second direction is less than the standard coordinate in the second direction, performing a third method.

7. The color temperature calibration method according to claim 6 , wherein the first method includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold;

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is not less than the first threshold, decreasing the pixel value of the third sub-pixel, re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted, and determining a difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction, until the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold;

if it is determined that the measured coordinate in the second direction is greater than the standard coordinate in the second direction, decreasing the pixel value of the second sub-pixel;

if it is determined that the measured coordinate in the second direction is less than the standard coordinate in the second direction, increasing the pixel value of the second sub-pixel;

re-obtaining a measured coordinate in the second direction corresponding to the target pixel of which the pixel value of the second sub-pixel is adjusted; and

determining a difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction, until the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than a second threshold.

8. The color temperature calibration method according to claim 7 , further comprising:

if the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than the second threshold, comparing a measured coordinate in the first direction in a current state with the standard coordinate in the first direction;

if it is determined that a difference between the measured coordinate in the first direction in the current state and the standard coordinate in the first direction is not less than the second threshold, determining whether the re-obtained measured coordinate in the first direction is greater than the standard coordinate in the first direction;

if it is determined that the measured coordinate in the first direction in the current state is greater than the standard coordinate in the first direction, increasing the pixel value of the third sub-pixel;

if it is determined that the measured coordinate in the first direction in the current state is less than the standard coordinate in the first direction, decreasing the pixel value of the third sub-pixel;

re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted; and

the first threshold is greater than the second threshold, and the target threshold is less than or equal to the second threshold.

9. The color temperature calibration method according to claim 8 , further comprising:

if the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the second threshold, adjusting the pixel values of the second sub-pixel and the third sub-pixel based on a second sub-adjustment mode;

re-obtaining measured color coordinates corresponding to the target pixel of which the pixel values of the second sub-pixel and the third sub-pixel are adjusted;

ending the color temperature calibration, wherein

the second threshold is greater than the third threshold, and the target threshold is not less than the third threshold.

10. The color temperature calibration method according to claim 9 , wherein the second sub-adjustment mode includes:

if the re-obtained measured coordinate in the first direction is less than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is greater than the standard coordinate in the second direction, decreasing the pixel value of the second sub-pixel;

if the re-obtained measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is less than the standard coordinate in the second direction, increasing the pixel value of the second sub-pixel; and

if the re-obtained measured coordinate in the first direction is greater than the standard coordinate in the first direction, and the re-obtained measured coordinate in the second direction is greater than the standard coordinate in the second direction, increasing the pixel value of the third sub-pixel.

11. The color temperature calibration method according to claim 6 , wherein the second method includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold;

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is not less than the first threshold, decreasing the pixel value of the third sub-pixel, re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted, and determining a difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction, until the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold; and

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold, decreasing the pixel value of the second sub-pixel, re-obtaining a measured coordinate in the second direction corresponding to the target pixel of which the pixel value of the second sub-pixel is adjusted, and determining a difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction, until the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than a second threshold.

12. The color temperature calibration method according to claim 11 , further comprising:

if it is determined that the measured coordinate in the first direction in the current state is not greater than the standard coordinate in the first direction, decreasing the pixel value of the third sub-pixel;

re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted; and

the first threshold is greater than the second threshold, and the target threshold is less than or equal to the second threshold.

13. The color temperature calibration method according to claim 12 , further comprising:

re-obtaining measured color coordinates corresponding to the target pixel of which the pixel values of the second sub-pixel and the third sub-pixel are adjusted;

ending the color temperature calibration, wherein

the second threshold is greater than the third threshold, and the target threshold is not less than the third threshold.

14. The color temperature calibration method according to claim 6 , wherein the third method includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold;

if it is determined that the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is not less than the first threshold, increasing the pixel value of the third sub-pixel, re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted, and determining a difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction, until the difference between the re-obtained measured coordinate in the first direction and the standard coordinate in the first direction is less than the first threshold; and

re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted; and

if the difference between the measured coordinate in the first direction in the current state and the standard coordinate in the first direction is less than the second threshold, adjusting the pixel values of the second sub-pixel and the third sub-pixel based on a second sub-adjustment mode;

re-obtaining measured color coordinates corresponding to the target pixel of which the pixel values of the second sub-pixel and the third sub-pixel are adjusted;

determining differences between the re-obtained measured color coordinates and the standard color coordinates, until a difference between a re-obtained measured coordinate in the first direction in the re-obtained measured color coordinates and the standard coordinate in the first direction is not greater than the third threshold, and/or a difference between a re-obtained measured coordinate in the second direction in the re-obtained measured color coordinates and the standard coordinate in the second direction is not greater than the third threshold; and

the second direction and the standard coordinate in the second direction, until the difference between the re-obtained measured coordinate in the second direction and the standard coordinate in the second direction is less than a second threshold.

15. The color temperature calibration method according to claim 14 , further comprising:

re-obtaining a measured coordinate in the first direction corresponding to the target pixel of which the pixel value of the third sub-pixel is adjusted; and

ending the color temperature calibration, wherein

the first threshold is greater than the second threshold, the second threshold is greater than the third threshold, the target threshold is not less than the third threshold, and the target threshold is less than or equal to the second threshold.

16. A non-transitory computer-readable storage medium having computer program instructions that, when running in one or more processors of a color temperature self-calibration system, cause the color temperature self-calibration system to perform one or more steps in a color temperature calibration method, the color temperature calibration method comprising:

making a display screen display a test image at a target color temperature;

measuring a chromaticity of a target pixel in the display screen to obtain measured color coordinates of the target pixel;

comparing the measured color coordinates with standard color coordinates;

if differences between the measured color coordinates and the standard color coordinates are not greater than the target threshold, ending the color temperature calibration,

wherein: the target pixel includes a first sub-pixel, a second sub-pixel and a third sub-pixel of different colors; and

wherein adjusting the pixel values of the first sub-pixel and the second sub-pixel based on the first adjustment mode includes:

determining whether the difference between the measured coordinate in the first direction and the standard coordinate in the first direction is less than a first threshold;

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 31, 2022

From: WANG, XIAN

To: BOE TECHNOLOGY GROUP CO., LTD.

Reel/Frame 058831/0552 →

Continuity (1)

Related Publication 20220398969A1 · Dec 15, 2022