Backlight source control method of display device, display device and storage medium

Patent metadata

Field	Value
Publication number	US-10965898-B2
Application number	US-201816206254-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Aug 28, 2014
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

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.

First claim

The invention claimed is:

1. A backlight source control method of a display device having a display screen, comprising:
obtaining an image to be displayed;
determining a first backlight source brightness value of a first display subregion of the image corresponding to gray-scale values of pixels in the first display subregion, and a second backlight source brightness value of a second display subregion of the image corresponding to gray-scale values of pixels in the second display subregion, wherein a second backlight subregion corresponding to the second display subregion is adjacent to a first backlight subregion corresponding to the first display subregion;
in response to a first backlight source in the first backlight subregion to be turned off based on the first backlight source brightness value, determining an adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value; and
driving a second backlight source in the second backlight subregion according to the adjusted second backlight source brightness value;
wherein before the operation of determining the adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value, the method further comprises: extracting pixel gray-scale values of pixel rows from a first portion of the first display subregion at intervals and extracting pixel gray-scale values of pixel rows from a second portion of the first display subregion at intervals; and if both an average gray-scale value of all the extracted pixels in the first portion of the first display subregion and an average gray-scale value of all the extracted pixels in the second portion of the first display subregion are smaller than a first threshold, or, if the average gray-scale value of all the extracted pixels in the first or second portion of the first display subregion is smaller than the first threshold and a proportion occupied by pixels of which gray-scale values are 0 in the other of the first or second portion of the first display subregion is greater than a second threshold, determining that the image to be displayed is displayed in a wide-screen film mode with a length-width ratio of 21:9;
wherein the first threshold is greater than 0 and the second threshold is greater than 0;
in response to the image to be displayed is displayed in the wide-screen film mode on the display screen, turning off a backlight source corresponding to a display subregion.

2. The method of claim 1 , wherein the operation of determining the adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value comprises:
obtaining a backlight source weight value corresponding to the second backlight source brightness value according to a mapping relation between backlight source brightness values and backlight source weight values; and
multiplying the obtained backlight source weight value by the second backlight source brightness value to obtain the adjusted second backlight source brightness value, wherein the obtained backlight source weight value is greater than 0 and less than 1.

3. The method of claim 1 , wherein the first display subregion corresponding to the first backlight source to be turned off is located in a predetermined region of the display screen, wherein the predetermined region is at least one of a first region located at the top of the display screen, and a second region located at the bottom of the display screen.

4. The method of claim 1 , wherein before the operation of determining the adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value, the method further comprises:
in response to an average gray-scale value of all pixels in the first display subregion is smaller than a third threshold, turning off the first backlight source in the first backlight subregion, wherein the third threshold is greater than 0.

5. The method of claim 1 , wherein the operation of in response to the gray-scale value of at least one pixel in at least one row of image pixels of the first display subregion is a predetermined gray-scale value, turning off the first backlight source in the first backlight subregion comprises:
determining that the image is displayed in the wide-screen film mode; and
turning off the first backlight source in the first backlight subregion; and

in response to the gray-scale value of at least one pixel in at least one row of image pixels of the first display subregion is a second predetermined gray-scale value, determining that subtitles are displayed in the first display subregion.

6. The method of claim 1 , wherein the first display subregion comprises a top display subregion located at the top of the display screen and a bottom display subregion located at the bottom of the display screen.

7. The method of claim 1 , wherein before the operation of determining the adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value, the method further comprises:
in response to a proportion occupied by pixels of which gray-scale values are 0 gray in the first display subregion is greater than a third threshold, turning off the first backlight source in the first backlight subregion, wherein the third threshold is greater than 0.

8. A display device, comprising:
a display screen;
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:
obtaining an image to be displayed;
determining a first backlight source brightness value of a first display subregion of the image corresponding to gray-scale values of pixels in the first display subregion, and a second backlight source brightness value of a second display subregion of the image corresponding to gray-scale values of pixels in the second display subregion, wherein a second backlight subregion corresponding to the second display subregion is adjacent to a first backlight subregion corresponding to the first display subregion;
in response to a first backlight source in the first backlight subregion to be turned off based on the first backlight source brightness value, determining an adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value; and
driving a second backlight source in the second backlight subregion according to the adjusted second backlight source brightness value;
wherein before the operation of determining the adjusted second backlight source brightness value of the second display subregion by lowering the second backlight source brightness value, the one or more processors are used to execute the computer-readable program codes to implement:
extracting pixel gray-scale values of pixel rows from a first portion of the first display subregion at intervals and extracting pixel gray-scale values of pixel rows from a second portion of the first display subregion at intervals; and if both an average gray-scale value of all the extracted pixels in the first portion of the first display subregion and an average gray-scale value of all the extracted pixels in the second portion of the first display subregion are smaller than a first threshold, or, if the average gray-scale value of all the extracted pixels in the first or second portion of the first display subregion is smaller than the first threshold and a proportion occupied by pixels of which gray-scale values are 0 in the other of

Assignees

• Hisense Visual Tech Co Ltd
• Hisense Usa Corp
• Hisense Interantional Co Ltd
• Hisense Int Co Ltd

Inventors

• Yang Jia
• Zhang Yuxin
• Huang Shunming

Classifications

• G09G2320/0686

  with two or more screen areas displaying information with different brightness or colours · CPC title

• H04N5/44504 Primary

  Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits · CPC title

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G3/3426

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title