Backlight Source Control Method Of Display Device, Display Device And Storage Medium

• US 20160063688A1
• Filed: 11/19/2014
• Published: 03/03/2016
• Est. Priority Date: 08/28/2014
• Status: Active Grant

• Current Assignee: Hisense Electric Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Hisense Electric Co., Ltd. (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Inventors: Huang, Shunming, Yang, Jia, Zhang, Yuxin
• Granted Patent: US 10,165,217 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 5/44504 Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits

Abstract

One or more embodiments of the present application disclose a backlight source control method of a display device, the display device and a storage medium. The method includes: determining a display subregion corresponding to a backlight source to be turned off; determining a first backlight source brightness value of an adjacent display subregion of the display subregion corresponding to the backlight source to be turned off; lowering the first backlight source brightness value to obtain a second backlight source brightness value; and setting the backlight source brightness value corresponding to the adjacent display subregion to be the second backlight source brightness value.

Claims

1. A backlight source control method of a display device, comprising:

determining a display subregion corresponding to a backlight source to be turned off;

determining a first backlight source brightness value of an adjacent display subregion of the display subregion corresponding to the backlight source to be turned off;

lowering the first backlight source brightness value to obtain a second backlight source brightness value;

setting the backlight source brightness value corresponding to the adjacent display subregion to be the second backlight source brightness value.

2. The method of claim 1, wherein the operation of lowering the first backlight source brightness value to obtain the second backlight source brightness value comprises:

obtaining a backlight source weight value corresponding to the first backlight source brightness value according to a mapping relation between backlight source brightness values and backlight source weight values;

multiplying the backlight source weight value by the first backlight source brightness value to obtain the second backlight source brightness value, wherein the backlight source weight value is greater than 0 and less than 1.

3. The method of claim 1, wherein the display subregion corresponding to the backlight source to be turned off is located in a predetermined region of the display screen.

4. The method of claim 1, wherein the operation of determining the display subregion corresponding to the backlight source to be turned off comprises:

determining whether the image to be displayed is displayed in a wide-screen film mode in the display screen, if so, turning off a backlight source corresponding to a display subregion in a first region of the display screen;

determining whether subtitles are displayed in a second region of the display screen, if not, turning off a backlight source corresponding to a display subregion in the second region,

wherein the first region is located at the top of the display screen, and the second region is located at the bottom of the display screen.

5. The method of claim 4, wherein the operation of determining whether the image to be displayed is displayed in the wide-screen film mode in the display screen comprises:

obtaining the image to be displayed, and determining a first image displayed in the first region of the display screen and a second image displayed in the second region of the display screen in the image to be displayed;

obtaining gray-scale values of pixels in the first image and the second image;

if both an average gray-scale value of all pixels in the first image and an average gray-scale value of all pixels in the second image are smaller than a first threshold which is greater than 0, or, if the average gray-scale value of all the pixels in the first image is smaller than the first threshold and a proportion occupied by pixels of which gray-scale values are 0 in the second image is greater than a second threshold which is greater than 0;

determining that the image to be displayed is displayed in the wide-screen film mode.

6. The method of claim 5, wherein the operation of obtaining the gray-scale values of the pixels in the first image and the second image comprises:

extracting pixel gray-scale values of pixel rows from the first image and the second image at intervals.

7. The method of claim 4, wherein the operation of determining whether the subtitles are displayed in the second region comprises:

if a gray-scale value of at least one pixel in at least one row of image pixels of the second region is a predetermined gray-scale value, determining that the subtitles are displayed in the second region.

8. The method of claim 2, further comprising:

determining a backlight source state corresponding to a display subregion in a predetermined region of the display screen, wherein the backlight source state comprises a backlight source turn-on state or a backlight source turn-off state;

determining whether the backlight source state of the display subregion in the predetermined region satisfies a backlight source control condition;

if so, setting a backlight source brightness value of the display subregion in the predetermined region so that the backlight source brightness value varies monotonously when continuous M frames of images starting from the image to be displayed are displayed in the display subregion, wherein M is a positive integer greater than 0.

9. The method of claim 8, wherein the operation of determining whether the backlight source state of the display subregion satisfies the backlight source control condition comprises:

judging whether the backlight source state of the display subregion is identical to the backlight source state when a frame of image previous to the image to be displayed is displayed in the display subregion;

if not, determining that the backlight source state of the display subregion satisfies the backlight source control condition.

10. A display device, comprising:

a memory; and

one or more processors,

wherein the memory stores computer-readable program codes, and the one or more processors are used to execute the computer-readable program codes to implement;

determining a display subregion corresponding to a backlight source to be turned off;

determining a first backlight source brightness value of an adjacent display subregion of the display subregion corresponding to the backlight source to be turned off;

lowering the first backlight source brightness value to obtain a second backlight source brightness value;

setting the backlight source brightness value corresponding to the adjacent display subregion to be the second backlight source brightness value.

11. The display device of claim 10, wherein the operation of lowering the first backlight source brightness value to obtain the second backlight source brightness value comprises:

obtaining a backlight source weight value corresponding to the first backlight source brightness value according to a mapping relation between backlight source brightness values and backlight source weight values;

multiplying the backlight source weight value by the first backlight source brightness value to obtain the second backlight source brightness value, wherein the backlight source weight value is greater than 0 and less than 1.

12. The display device of claim 10, wherein the display subregion corresponding to the backlight source to be turned off is located in a predetermined region of the display screen.

13. The display device of claim 10, wherein the operation of determining the display subregion corresponding to the backlight source to be turned off comprises:

determining whether the image to be displayed is displayed in a wide-screen film mode in the display screen, if so, turning off a backlight source corresponding to a display subregion in a first region of the display screen;

determining whether subtitles are displayed in a second region of the display screen, if not, turning off a backlight source corresponding to a display subregion in the second region,

wherein the first region is located at the top of the display screen, and the second region is located at the bottom of the display screen.

14. The display device of claim 13, wherein the operation of determining whether the image to be displayed is displayed in the wide-screen film mode in the display screen comprises:

obtaining the image to be displayed, and determining a first image displayed in the first region of the display screen and a second image displayed in the second region of the display screen in the image to be displayed;

obtaining gray-scale values of pixels in the first image and the second image;

if both an average gray-scale value of all pixels in the first image and an average gray-scale value of all pixels in the second image are smaller than a first threshold which is greater than 0, or, if the average gray-scale value of all the pixels in the first image is smaller than the first threshold and a proportion occupied by pixels of which gray-scale values are 0 in the second image is greater than a second threshold which is greater than 0;

determining that the image to be displayed is displayed in the wide-screen film mode.

15. The display device of claim 14, wherein the operation of obtaining the gray-scale values of the pixels in the first image and the second image comprises:

extracting pixel gray-scale values of pixel rows from the first image and the second image at intervals.

16. The display device of claim 13, wherein the operation of determining whether the subtitles are displayed in the second region comprises:

if a gray-scale value of at least one pixel in at least one row of image pixels of the second region is a predetermined gray-scale value, determining that the subtitles are displayed in the second region.

17. The display device of claim 13, wherein the computer-readable program codes is further executed to implement:

determining a backlight source state corresponding to a display subregion in a predetermined region of the display screen, wherein the backlight source state comprises a backlight source turn-on state or a backlight source turn-off state;

determining whether the backlight source state of the display subregion in the predetermined region satisfies a backlight source control condition;

if so, setting a backlight source brightness value of the display subregion in the predetermined region so that the backlight source brightness value varies monotonously when continuous M frames of images starting from the image to be displayed are displayed in the display subregion, wherein M is a positive integer greater than 0.

18. The display device of claim 17, wherein the operation of determining whether the backlight source state of the display subregion satisfies the backlight source control condition comprises:

judging whether the backlight source state of the display subregion is identical to the backlight source state when a frame of image previous to the image to be displayed is displayed in the display subregion;

if not, determining that the backlight source state of the display subregion satisfies the backlight source control condition.

19. A storage medium storing computer-readable program codes, wherein the computer-readable program codes are executed by one or more processors to implement:

determining a display subregion corresponding to a backlight source to be turned off;

determining a first backlight source brightness value of an adjacent display subregion of the display subregion corresponding to the backlight source to be turned off;

lowering the first backlight source brightness value to obtain a second backlight source brightness value;

setting the backlight source brightness value corresponding to the adjacent display subregion to be the second backlight source brightness value.

20. The storage medium of claim 19, wherein the operation of lowering the first backlight source brightness value to obtain the second backlight source brightness value comprises:

obtaining a backlight source weight value corresponding to the first backlight source brightness value according to a mapping relation between backlight source brightness values and backlight source weight values;

multiplying the backlight source weight value by the first backlight source brightness value to obtain the second backlight source brightness value, wherein the backlight source weight value is greater than 0 and less than 1.