Method for matching color temperature of display and system thereof

Patent metadata

Field	Value
Publication number	US-2021134209-A1
Application number	US-202017089797-A
Country	US
Kind code	A1
Filing date	Nov 5, 2020
Priority date	Nov 6, 2019
Publication date	May 6, 2021
Grant date	—

Abstract

A method for matching a color temperature of a display and a system thereof are provided. The system adopts a first color analyzer for obtaining a first regional color value for a specific area of the display, and a second color analyzer for obtaining a global color value for a whole area and a second regional color value for the specific area. While obtaining a difference between the first and second regional color values and another difference between the global color value and the second regional color value, a sum of the differences is calculated. The sum of differences and a global color target value obtained in an offline mode are referred to to adjust a correction target for the specific area of the display. A new correction target can be obtained for providing display parameters of colors that are applied to the whole area of the display.

First claim

What is claimed is:

1 . A system for matching a color temperature of a display, comprising:
a first color analyzer configured for determining a first regional color value of a specific area of the display, the first color analyzer setting up a correction target of the display; and a second color analyzer configured for determining a global color value of a whole area of the display and a second regional color value of the specific area of the display; wherein a first difference between the first regional color value and the second regional color value and a second difference between the global color value and the second regional color value are obtained, and a new global color target value is introduced for adjusting the correction target according to the first difference and the second difference so as to generate a new correction target for correcting display parameters of the display.

2 . The system according to claim 1 , wherein the new correction target is for adjusting gamma parameters and color transfer parameters of a color transfer matrix to be display parameters for correcting colors of the display.

3 . The system according to claim 2 , wherein the new correction target is applied to the first color analyzer for adjusting color parameters of the specific area of the display so as to form firmware parameters that are applied to a display chip of the display.

4 . The system according to claim 1 , wherein the specific area of the display is a central area near a center of the display panel of the display.

5 . The system according to claim 1 , wherein a color analysis process performed by the first color analyzer or the second color analyzer is to sample white colors of a color space, obtain information of the color temperature by capturing images of the specific area or the whole area of the display, and calculate the corresponding color information through a conversion equation between the color temperature and the color value.

6 . The system according to claim 1 , wherein the system obtains the new global color target value of the display in an offline mode for correcting the correction target of the display.

7 . The system according to claim 6 , wherein the steps for obtaining the new global color target value in the offline mode includes:
providing multiple displays, determining by the first color analyzer the color value of the specific area of each of the displays; determining by the second color analyzer the global color value of each of the displays and the color value of the specific area of the display; for each of the displays, calculating a difference of the color values of the specific area obtained from the first color analyzer and the second color analyzer, and another difference between a regional color value of the specific area and the global color value obtained by the second color analyzer, and obtaining a sum of the differences; obtaining a global target value for each of the displays by the second color analyzer according to a correction target setting of the specific area by the first color analyzer and the sum of the differences; and calculating an average value of the multiple displays based on the global target value for each of the displays, and obtaining the new global color target value.

8 . A method for matching a color temperature of a display having a correction target and operating in an online mode to obtain a new global color target value of the display based on an offline mode, and the new global color target value being used for correction of the correction target of the display, wherein the method comprises:
determining by a first color analyzer a first regional color value of a specific area of the display; determining by a second color analyzer a global color value of a whole area of the display; obtaining a second regional color value of the specific area of the display according to the global color value; obtaining a first difference between the first regional color value and the second regional color value and a second difference between the global color value and the second regional color value; and introducing the new global color target value for adjusting the correction target according to the first difference and the second difference so as to generate a new correction target for correcting display parameters of the display.

9 . The method according to claim 8 , wherein, when the new global color target value in the offline mode is obtained, further comprising:
providing multiple displays, determining by the first color analyzer the color value of the specific area of each of the displays; determining by the second color analyzer the global color value of each of the displays and the color value of the specific area of the display; for each of the displays, calculating a difference of the color values of the specific area obtained from the first color analyzer and the second color analyzer, and another difference between a regional color value of the specific area and the global color value obtained by the second color analyzer, and obtaining a sum of the differences; obtaining a global target value for each of the displays by the second color analyzer according to a correction target setting of the specific area by the first color analyzer and the sum of the differences; and calculating an average value of the multiple displays based on the global target value for each of the displays, and obtaining the new global color target value.

10 . The method according to claim 8 , wherein the correction target and the new correction target uses Tristimulus values as target parameters to be corrected.

11 . The method according to claim 8 , wherein a sum of differences is obtained by adding the first difference and the second difference, the sum is subtracted from the new global color target value, and the new correction target is obtained for correcting the correction target of the display.

12 . The method according to claim 11 , wherein the step for obtaining the new global color target value in the offline mode includes:
providing multiple displays, determining by the first color analyzer the color value of the specific area of each of the displays; determining by the second color analyzer the global color value of each of the displays and the color value of the specific area of the display; for each of the displays, calculating a difference of the color values of the specific area obtained from the first color analyzer and the second color analyzer, and another difference between a regional color value of the specific area and the global color value obtained by the second color analyzer, and obtaining a sum of the differences; obtaining a global target value for each of the displays by the second color analyzer according to a correction target setting of the specific area by the first color analyzer and the sum of the differences; and calculating an average value of the multiple displays based on the global target value for each of the displays, and obtaining the new global color target value.

13 . The method according to claim 11 , wherein the new correction target is for adjusting gamma parameters and color transfer parameters of a color transfer matrix to be display parameters for correcting colors of the display.

14 . The method according to claim 13 , wherein the new correction target is applied to the first color analyzer for adjusting color parameters of the specific area of the display so as to form firmware parameters that are applied to a display chip of the display.

15 . The method according to claim 14 , whe

Assignees

• Realtek Semiconductor Corp

Inventors

• Shih Chun-Yuan

Classifications

• G09G2320/0666

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

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G2320/0693

  Calibration of display systems · CPC title

• G09G3/2003 Primary

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title