Detection method and detection device for display screen

Patent metadata

Field	Value
Publication number	US-12461027-B2
Application number	US-202118042857-A
Country	US
Kind code	B2
Filing date	Aug 24, 2021
Priority date	Aug 31, 2020
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A detection method for a display screen is provided, including: emitting, by a light source, light onto a surface of a display screen to form a diffuse reflection, where the light source includes an initial first color channel value a1 and an initial second color channel value b1; measuring, by a detector, a first color channel value a and a second color channel value b of the reflected light; calculating a color breakup value l ab of the reflected light by: l ab =√{square root over ((a−a1) 2 +(b−b1) 2 )}; calculating, in response to (a+b) being not equal to 0, a hue value ε by: ε=|a+b|/(a+b); calculating a color breakup and hue quantization value φ of the reflected light by: φ=l ab ×ε=|a+b|√{square root over ((a−a1) 2 +(b−b1) 2 )}/(a+b); and determining whether the display screen is qualified based on determining whether the color breakup and hue quantization value φ is within a predetermined quantization value range.

First claim

What is claimed is:

1 . A method for detecting a display screen, comprising:
emitting, by a light source, light onto a surface of a display screen to form a diffuse reflection, wherein the light source comprises an initial first color channel value a1 and an initial second color channel value b1; measuring, by a detector, a first color channel value a and a second color channel value b of the reflected light; calculating a color breakup value lab of the reflected light by: l ab =√{square root over ((a−a1) 2 +(b−b1) 2 )}; calculating, in response to (a+b) being not equal to 0, a hue value ε by: ε=|a+b|/(a+b); calculating a color breakup and hue quantization value φ of the reflected light by: φ=l ab ×ε=|a+b|/√{square root over ((a−a1) 2 +(b−b1) 2 )}/(a+b); and determining whether the display screen is qualified based on determining whether the color breakup and hue quantization value q is within a predetermined quantization value range.

2 . The detection method according to claim 1 , further comprising:
determining, in response to (a+b) being equal to 0, whether the display screen is qualified based on determining whether the color breakup value l ab of the reflected light is within a predetermined color breakup value range.

3 . The detection method according to claim 1 , wherein the calculating a color breakup and hue quantization value φ of the reflected light comprises calculating a plurality of color breakup and hue quantization values φ,
the detection method further comprises: calculating an average value φ average of the plurality of color breakup and hue quantization values φ, and
the determining whether the display screen is qualified based on determining whether the color breakup and hue quantization value φ is within a predetermined quantization value range comprises: determining whether the display screen is qualified based on determining whether the average value φ average is within the predetermined quantization value range.

4 . The detection method according to claim 3 , wherein the light source is a point light source, and the display screen comprises at least one test point located on the surface of the display screen;
emitting, by the light source, light onto the surface of the display screen comprises: emitting, by the point light source, light onto the at least one test point; measuring, by the detector, the first color channel value a and the second color channel value b of the reflected light comprises: for each test point, rotating the detector around the test point in a plane perpendicular to the display screen, so as to obtain a plurality of measurement positions, wherein the point light source and the test point are located in the plane; and obtaining, by the detector, the first color channel values a and the second color channel values b of the reflected light at the plurality of measurement positions, respectively, calculating the plurality of color breakup and hue quantization values φ comprises: respectively calculating the color breakup and hue quantization values φ for the first color channel values a and the second color channel values b of the reflected light at the plurality of measurement positions, so as to obtain the plurality of color breakup and hue quantization values φ.

5 . The detection method according to claim 4 , wherein the light emitted by the point light source is incident on the display screen at an incident angle of 30° to 60°.

6 . The detection method according to claim 4 , wherein the at least one test point comprises a plurality of test points distributed in a matrix, and a center of the matrix coincides with a center of the display screen.

7 . The detection method according to claim 4 , wherein an orthographic projection of an incident path of the light emitted by the point light source to the display screen on the display screen is parallel to, perpendicular to, or at a predetermined acute angle with respect to a length direction of the display screen.

8 . The detection method according to claim 3 , wherein the light source is a line light source parallel to the display screen, the display screen comprises at least one test line on the surface of the display screen, and each test line comprises a plurality of test points;
emitting, by the light source, light onto the surface of a display screen comprises: emitting, by the line light source, light onto the at least one test line; measuring, by the detector, the first color channel value a and a second color channel value b of the reflected light comprises: for each test line, moving the detector in a direction parallel to an extension direction of the test line; and for each test point on each test line, rotating the detector around the test point in a plane perpendicular to the test line comprising the test point, so as to obtain a plurality of measurement positions, wherein the test point is located in the plane; and obtaining, by the detector, the first color channel values a and the second color channel values b of the reflected light at the plurality of measurement positions, respectively, calculating the plurality of color breakup and hue quantization values φ comprises: respectively calculating the color breakup and hue quantization values φ for the first color channel values a and the second color channel values b of the reflected light at the plurality of measurement positions, so as to obtain the plurality of color breakup and hue quantization values φ.

9 . The detection method according to claim 8 , wherein the light emitted by the line light source is incident on the display screen at an incident angle of 30° to 60°.

10 . The detection method according to claim 8 , wherein the at least one test line comprises a plurality of test lines parallel to each other and distributed evenly on the display screen.

11 . The detection method according to claim 8 , wherein the test line is parallel to, perpendicular to, or at a predetermined acute angle with respect to a length direction of the display screen.

12 . The detection method according to claim 3 , wherein the light source is a surface light source parallel to the display screen, and an orthographic projection of a center of the surface light source on the display screen coincides with a center of the surface of the display screen;
emitting, by the light source, light onto the surface of the display screen comprises: emitting, by the surface light source, light onto an entire surface of the display screen; measuring, by the detector, the first color channel value a and the second color channel value b of the reflected light comprises: rotating the detector around a straight line connecting the center of the surface light source and the center of the surface of the display screen in a plane parallel to the surface of the display screen, so as to obtain a plurality of rotation positions; and for each rotation position, rotating the detector around the center of the surface of the display screen in a plane perpendicular to the display screen, so as to obtain a plurality of measurement positions, wherein the rotation position and the center of the surface of the display screen are located in the plane perpendicular to the display screen; and obtaining, by the detector, the first color channel values a and the second color channel values b of the reflected light at the plurality of measurement positions, respectively, calculating the plurality of color breakup and hue quantization values φ comprises: respectively calculating the color breakup and hue quantization values φ for the first color channel values a and the second color channel values b of the reflected light at the pl

Assignees

• Chongqing Boe Display Tech Co Ltd
• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Huang Can
• Gao Hongcheng
• Bao Jiandong
• Shi Dawei
• Yang Lu
• Wang Wentao
• Ma Weitao

Classifications

• H10K71/70

  Testing, e.g. accelerated lifetime tests · CPC title

• G01J3/504

  Goniometric colour measurements, for example measurements of metallic or flake based paints · CPC title

• G01M99/005

  Testing of complete machines, e.g. washing-machines or mobile phones (testing of machine parts G01M13/00; testing of electric apparatus or components G01R31/50) · CPC title

• G01J3/506

  measuring the colour produced by screens, monitors, displays or CRTs · CPC title

• G01N21/4738 Primary

  Diffuse reflection (precedence is given to G01N21/55 - G01N21/57 if specular component is taken into consideration), e.g. also for testing fluids, fibrous materials · CPC title