Vision inspection apparatus and method of compensating gamma defect and mura defect thereof

Patent metadata

Field	Value
Publication number	US-9576541-B2
Application number	US-201514681015-A
Country	US
Kind code	B2
Filing date	Apr 7, 2015
Priority date	Nov 21, 2014
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A vision inspection apparatus includes a first luminance profile generator configured to generate a plurality of first luminance profiles corresponding to the plurality of reference grayscales, a gamma corrector configured to calculate a gamma correction value of the display apparatus using the plurality of first luminance profiles corresponding to the plurality of reference grayscales, and a second luminance profile generator configured to apply the gamma correction value to each of the plurality of first luminance profiles and to generate a plurality of second luminance profiles corresponding to the plurality of reference grayscales.

First claim

What is claimed is:

1. A vision inspection apparatus comprising:
a camera configured to capture a plurality of reference grayscale images corresponding to a plurality of reference grayscales displayed on a display apparatus;
a first luminance profile generator configured to generate a plurality of first luminance profiles corresponding to the plurality of reference grayscales;
a gamma corrector configured to calculate a gamma correction value of the display apparatus utilizing the plurality of first luminance profiles corresponding to the plurality of reference grayscales;
a second luminance profile generator configured to apply the gamma correction value to the plurality of first luminance profiles and to generate a plurality of second luminance profiles corresponding to the plurality of reference grayscales; and
a Mura corrector configured to calculate a plurality of Mura correction values corresponding to the plurality of reference grayscales utilizing the plurality of second luminance profiles and a plurality of target luminance profiles.

2. The vision inspection apparatus of claim 1 , wherein the gamma corrector is configured to generate a measured gamma curve of the display apparatus utilizing the plurality of first luminance profiles and to calculate the gamma correction value utilizing the measured gamma curve and a target gamma curve.

3. The vision inspection apparatus of claim 1 , wherein the plurality of first luminance profiles corresponding to the plurality of reference grayscales comprise a luminance profile of at least one selected from a horizontal direction and a vertical direction of the display apparatus.

4. The vision inspection apparatus of claim 3 , wherein the plurality of second luminance profiles corresponding to the plurality of reference grayscales comprise a luminance profile of at least one selected from a horizontal direction and a vertical direction of the display apparatus.

5. The vision inspection apparatus of claim 3 , wherein the Mura corrector is configured to generate a plurality of horizontal Mura correction values utilizing the second luminance profiles of the horizontal direction corresponding to the reference grayscales and a plurality of horizontal target luminance profiles.

6. The vision inspection apparatus of claim 3 , wherein the Mura corrector is configured to generate a plurality of vertical Mura correction values utilizing the second luminance profiles of the vertical direction corresponding to the reference grayscales and a plurality of vertical target luminance profiles.

7. The vision inspection apparatus of claim 1 , further comprising:
a memory configured to store the plurality of Mura correction values corresponding to the reference grayscales.

8. A method of compensating a gamma defect and a Mura defect, the method comprising:
displaying a plurality of reference grayscale images respectively corresponding to a plurality of reference grayscales on a display apparatus;
generating a plurality of first luminance profiles corresponding to the plurality of reference grayscales utilizing each of the plurality of reference grayscale images displayed on the display apparatus;
calculating a gamma correction value of the display apparatus utilizing the plurality of first luminance profiles corresponding to the plurality of reference grayscales;
applying the gamma correction value to the plurality of first luminance profiles to generate a plurality of second luminance profiles corresponding to the plurality of reference grayscales; and
calculating a plurality of Mura correction values corresponding to the reference grayscales utilizing the second luminance profiles and a plurality of target luminance profiles.

9. The method of claim 8 , wherein the calculating the gamma correction value comprises:
generating a measured gamma curve corresponding to a central area of the display apparatus utilizing the plurality of first luminance profiles corresponding to the plurality of reference grayscales; and
calculating the gamma correction value utilizing the measured gamma curve and a target gamma curve.

10. The method of claim 8 , wherein the first luminance profiles corresponding to the reference grayscales comprise a luminance profile of at least one selected from a horizontal direction and a vertical direction of the display apparatus.

11. The method of claim 10 , wherein the second luminance profiles corresponding to the reference grayscales comprise a luminance profile of at least one selected from a horizontal direction and a vertical direction of the display apparatus.

12. The method of claim 10 , wherein the calculating the plurality of Mura correction values comprises:
generating a plurality of horizontal Mura correction values utilizing the second luminance profiles of the horizontal direction corresponding to the reference grayscales and a plurality of horizontal target luminance profiles.

13. The method of claim 10 , wherein the calculating the plurality of Mura correction values comprises:
generating a plurality of vertical Mura correction values utilizing the second luminance profiles of the vertical direction corresponding to the reference grayscales and a plurality of vertical target luminance profiles.

14. The method of claim 8 , further comprising:
storing the plurality of Mura correction values corresponding to the reference grayscales.

15. A system of compensating a gamma defect and a Mura defect, the system comprising:
means for displaying a plurality of reference grayscale images respectively corresponding to a plurality of reference grayscales on a display apparatus;
means for generating a plurality of first luminance profiles corresponding to the plurality of reference grayscales utilizing each of the plurality of reference grayscale images displayed on the display apparatus;
means for calculating a gamma correction value of the display apparatus utilizing the plurality of first luminance profiles corresponding to the plurality of reference grayscales;
means for applying the gamma correction value to the plurality of first luminance profiles to generate a plurality of second luminance profiles corresponding to the plurality of reference grayscales; and
means for calculating a plurality of Mura correction values corresponding to the reference grayscales utilizing the second luminance profiles and a plurality of target luminance profiles.

Assignees

• Samsung Display Co Ltd

Inventors

• Chung Jae-Seob
• Moon Hoi-Sik
• Kim Kang-Hyun
• Na Jong-Hee
• Jung Woo-Jin
• Han Jung-Suk

Classifications

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G3/3611 Primary

  Control of matrices with row and column drivers · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title