Calculation method for viewing-angle compensation of display device, viewing-angle compensation structure, and display device

Patent metadata

Field	Value
Publication number	US-10657907-B2
Application number	US-201715580301-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Aug 28, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A calculation method for viewing-angle compensation of a display device, a viewing-angle compensation structure, and a display device is disclosed. The method includes: measuring tristimulus values for red, green, and blue displayed in grayscale of a display device in a viewing angle and a luminance gamma curve; calculating a central viewing angle, a first viewing angle, and a second viewing angle of an observation viewing angle of the display device, to obtain a viewing angle range of the observation viewing angle; obtaining a display look-up table (LUT) by using an angle of the viewing angle and the luminance gamma curve and according to a viewing angle algorithm; then obtaining a viewing-angle compensation value by using the central viewing angle and the viewing angle range and according to the display LUT; and eventually adjusting the corresponding tristimulus values in the display device according to the viewing-angle compensation value.

First claim

What is claimed is:

1. A calculation method for viewing-angle compensation of a display device, comprising:
measuring tristimulus values for red, green, and blue displayed in grayscale of a display device in a viewing angle and a luminance gamma curve;
calculating a central viewing angle, a first viewing angle, and a second viewing angle of an observation viewing angle of the display device, to obtain a viewing angle range of the observation viewing angle;
obtaining a display look-up table (LUT) by using an angle of the viewing angle and the luminance gamma curve and according to a viewing angle algorithm;
obtaining a viewing-angle compensation value by using the central viewing angle and the viewing angle range and according to the display LUT; and
adjusting the corresponding tristimulus values in the display device according to the viewing-angle compensation value;
wherein the display LUT corresponding to the viewing angle is calculated by using a calculation formula of the viewing angle algorithm and by introducing related parameters of the central viewing angle and the viewing angle range into the following formulas:
Gamma_H(0-degree)+Gamma_L(0-degree)=2*Gamma2.2(0-degree), and
Min(Gamma_H(θ)+Gamma_L(θ)−2*Gamma2.2(0-degree)), wherein

Gamma_H is a luminance gamma curve of a high-voltage pixel, and
Gamma_L is a luminance gamma curve of a low-voltage pixel.

2. The calculation method for viewing-angle compensation of a display device according to claim 1 , wherein the viewing angle comprises 0 degree, 15 degrees, 30 degrees, 45 degrees, 60 degrees, and 75 degrees.

3. The calculation method for viewing-angle compensation of a display device according to claim 2 , wherein the 0 degree viewing angle is a positive viewing angle.

4. The calculation method for viewing-angle compensation of a display device according to claim 1 , wherein the luminance gamma curve is a stimulus value Y of the tristimulus values.

5. The calculation method for viewing-angle compensation of a display device according to claim 1 , wherein the viewing angle range is a difference between the first viewing angle and the second viewing angle when the central viewing angle is obtained as a user faces the center of the display device.

6. The calculation method for viewing-angle compensation of a display device according to claim 5 , wherein an angle at a longest distance from the display device is the first viewing angle, an angle at a nearest end from the display device is the second viewing angle, the first viewing angle is greater than the central viewing angle, and the central viewing angle is greater than the second viewing angle.

7. The calculation method for viewing-angle compensation of a display device according to claim 1 , wherein the display LUT calculates a LUT corresponding to a full display comprising the viewing angle by using interpolation.

8. A viewing-angle compensation structure, comprising:
a measurement module, configured to measure all tristimulus values for red, green, and blue displayed in grayscale of a display device in a viewing angle and a luminance gamma curve;
a first calculation module, configured to calculate a central viewing angle, a first viewing angle, and a second viewing angle of an observation viewing angle of the display device, to obtain a viewing angle range of the observation viewing angle;
a second calculation module, configured to obtain a display look-up table (LUT) by using an angle of the viewing angle and the luminance gamma curve and according to a viewing angle algorithm;
an electrically-erasable programmable read-only memory (EEPROM), configured to store the display LUT;
a timing controller (TCON), configured to: obtain a viewing-angle compensation value according to the display LUT of the EEPROM, and generate a source signal; and
a conversion module, configured to convert the tristimulus values according to the source signal;
wherein the second calculation module calculates using a calculation formula of the viewing angle algorithm and introducing related parameters of the central viewing angle and the viewing angle range into the following formulas, the display LUT corresponding to the viewing angle:
Gamma_H(0-degree)+Gamma_L(0-degree)=2*Gamma2.2(0-degree), and
Min(Gamma_H(θ)+Gamma_L(θ)−2*Gamma2.2(0-degree)), where

Gamma_H is a luminance gamma curve of a high-voltage pixel, and
Gamma_L is a luminance gamma curve of a low-voltage pixel.

9. The viewing-angle compensation structure according to claim 8 , wherein the first calculation module calculates a difference between the first viewing angle and the second viewing angle to obtain the viewing angle range, wherein when the central viewing angle is obtained as a user faces the center of the display device, an angle at a longest distance from the display device is the first viewing angle, and an angle at a nearest end from the display device is the second viewing angle.

10. The viewing-angle compensation structure according to claim 9 , wherein the first viewing angle is greater than the central viewing angle, and the central viewing angle is greater than the second viewing angle.

11. The viewing-angle compensation structure according to claim 8 , wherein the viewing angle comprises 0 degree, 15 degrees, 30 degrees, 45 degrees, 60 degrees, and 75 degrees.

12. The viewing-angle compensation structure according to claim 11 , wherein the 0 degree viewing angle is a positive viewing angle.

13. The viewing-angle compensation structure according to claim 8 , wherein the luminance gamma curve is a stimulus value Y of the tristimulus values.

14. A display device, comprising a display panel, the display panel comprising a plurality of pixels, and configured to display an image, and a viewing-angle compensation structure, comprising:
a measurement module, configured to measure all tristimulus values for red, green, and blue displayed in grayscale of the display device in a viewing angle and a luminance gamma curve;
a first calculation module, configured to calculate a central viewing angle, a first viewing angle, and a second viewing angle of an observation viewing angle of the display device, to obtain a viewing angle range of the observation viewing angle;
a second calculation module, configured to obtain a display look-up table (LUT) by using an angle of the viewing angle and the luminance gamma curve and according to a viewing angle algorithm;
an electrically-erasable programmable read-only memory (EEPROM), configured to store the display LUT;
a timing controller (TCON), configured to: obtain a viewing-angle compensation value according to the display LUT of the EEPROM, and generate a source signal; and
a conversion module, configured to convert the tristimulus values according to the source signal;
wherein the second calculation module calculates, according to by using a calculation formula of the viewing angle algorithm and by introducing related parameters of the central viewing angle and the viewing angle range into the following formulas, the display LUT corresponding to the viewing angle:
Gamma_H(0-degree)+Gamma_L(0-degree)=2*Gamma2.2(0-degree), and
Min(Gamma_H(θ)+Gamma_L(θ)−2*Gamma2.2(0-degree)), where

Gamma_H is a luminance gamma curve of a high-voltage pixel, and
Gamma_L is a luminance gamma curve of a low-voltage pixel.

Assignees

• Hkc Corp Ltd
• Chongqing Hkc Optoelectronics Tech Co Limited
• Chongqing Hkc Optoelectronics Tech Co Ltd

Inventors

• Lee Chia-Hang

Classifications

• G09G2310/0243

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