Method and apparatus for displaying image on image display device

Patent metadata

Field	Value
Publication number	US-12190777-B2
Application number	US-202318315731-A
Country	US
Kind code	B2
Filing date	May 11, 2023
Priority date	Nov 11, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A method for displaying an image on an image displaying device includes the steps of: comparing gray scale level of an image signal for the light emitting element with given threshold level; and when the gray scale level is higher than the threshold level, driving the light emitting element by a driving signal corresponding to the gray scale level, and when the gray scale level is lower than the threshold level, driving the light emitting element by a dithering driving signal including a driving signal corresponding to the threshold level.

First claim

What is claimed is:

1. A method for displaying an image on an image displaying device, the method comprising:
comparing a gray scale level of an image signal for a light-emitting element of the image displaying device with a given threshold level, wherein the given threshold level is based on a type of the image and a total luminance of the image;
driving, when the gray scale level is higher than the given threshold level, the light-emitting element by a first driving signal corresponding to the gray scale level; and
driving, when the gray scale level is lower than the given threshold level, the light-emitting element by a dithering driving signal including a second driving signal corresponding to the given threshold level.

2. The method of claim 1 , wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level.

3. The method of claim 1 , wherein the type of the image is a still image.

4. The method of claim 1 , wherein the type of the image is a moving image.

5. The method of claim 1 , wherein the dithering driving signal includes temporal dithering and spatial dithering.

6. The method of claim 1 , wherein the dithering driving signal comprises temporal dithering or spatial dithering.

7. The method of claim 1 , wherein the light-emitting element is an organic light-emitting diode (OLED).

8. An apparatus for displaying an image on an image displaying device, the apparatus comprising:
a memory configured to store instructions; and
one or more processors coupled to the memory and configured to execute the instructions to cause the apparatus to:
determine a given threshold level based on a type of the image and a total luminance of the image;
compare a gray scale level of an image signal for a light emitting element of the image displaying device with the given threshold level;
select a first driving signal corresponding to the gray scale level when the gray scale level is higher than the given threshold level; or
select a dithering driving signal including a second driving signal corresponding to the given threshold level when the gray scale level is lower than the given threshold level; and
drive the light emitting element by the first driving signal or the dithering driving signal.

9. The apparatus of claim 8 , wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level.

10. The apparatus of claim 8 , wherein the type of the image is a still image.

11. The apparatus of claim 8 , wherein the type of the image is a moving image.

12. The apparatus of claim 8 , wherein the dithering driving signal comprises temporal dithering and spatial dithering.

13. The apparatus of claim 8 , wherein the dithering driving signal comprises temporal dithering or spatial dithering.

14. The apparatus of claim 8 , wherein the light emitting element is an organic light emitting diode (OLED).

15. A computer program product comprising computer-executable instructions for displaying an image on an image displaying device, the computer-executable instructions stored on a non-transitory computer-readable storage medium, wherein the computer-executable instructions when executed by one or more processors of an apparatus, cause the apparatus to:
determine a given threshold level based on a type of the image and a total luminance of the image;
compare a gray scale level of an image signal for a light emitting element of an image displaying device with the given threshold level;
select a first driving signal corresponding to the gray scale level when the gray scale level is higher than the given threshold level; or
select a dithering driving signal including a second driving signal corresponding to the given threshold level when the gray scale level is lower than the given threshold level; and
drive the light emitting element by the first driving signal or the dithering driving signal.

16. The computer program product of claim 15 , wherein the given threshold level is a first threshold level when the type of the image is a still image and is a second threshold level when the type of the image is a moving image, and wherein first threshold level is greater than the second threshold level.

17. The computer program product of claim 15 , wherein the type of the image is a moving image.

18. The computer program product of claim 15 , wherein the dithering driving signal comprises temporal dithering and spatial dithering.

19. The computer program product of claim 15 , wherein the dithering driving signal comprises temporal dithering or spatial dithering.

20. The computer program product of claim 15 , wherein the light emitting element is an organic light emitting diode (OLED).

Assignees

• Huawei Tech Co Ltd

Inventors

• Isobe Teppei

Classifications

• G09G3/2055

  the pattern being varied in time · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title