Method and apparatus for displaying image and screen driving board

Patent metadata

Field	Value
Publication number	US-12033592-B2
Application number	US-202017630721-A
Country	US
Kind code	B2
Filing date	Dec 24, 2020
Priority date	Dec 24, 2020
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

Provided is a method for displaying an image, including acquiring a first target image with a third resolution and a second target image with a fourth resolution; determining a reference grayscale value of each of the backlight sections based on grayscale values of respective pixels in the first image region corresponding to the backlight section; determining grayscale values of respective pixels in a first display image based on grayscale values of respective pixels in the first target image; determining grayscale values of respective pixels in a second display image; driving each of the backlight sources to emit light based on the reference grayscale value of the backlight section where the backlight source is disposed; driving the first display panel to perform display based on the first display image; and driving the second display panel to perform display based on the second display image.

First claim

What is claimed is:

1. A method for displaying an image, applicable to an apparatus for displaying an image of a display device, wherein the display device comprises a backlight module, a first display panel, and a second display panel that are laminated sequentially, wherein the backlight module comprises a plurality of backlight sections arranged in an array and a plurality of backlight sources, each of the backlight sections being provided with at least one of the backlight sources, and wherein the first display panel comprises a black-and-white display panel of a first resolution and includes a plurality of first display panel regions which are in one-to-one correspondence with the plurality backlight sections, and the second display panel comprises a color display panel of a second resolution and includes a plurality of second display panel regions which are in one-to-one correspondence with the plurality backlight sections, wherein the first resolution being less than the second resolution; and the method comprises:
acquiring a first target image with a third resolution and a second target image with a fourth resolution based on a source image and acquiring grayscale values of respective pixels in the first target image and grayscale values of respective pixels in the second target image, wherein both the third resolution and the fourth resolution are less than the second resolution, and the first target image comprises a plurality of first image regions in one-to-one correspondence with the plurality of backlight sections;
determining a reference grayscale value of each of the backlight sections based on the grayscale values of respective pixels in the first image region corresponding to the backlight section;
determining grayscale values of respective pixels in a first display image based on the grayscale values of respective pixels in the first target image, wherein a resolution of the first display image is the first resolution;
determining grayscale values of respective pixels in a second display image based on the grayscale values of the respective pixels in the first target image, the grayscale values of respective pixels in the second target image, the reference grayscale values of the plurality of backlight sections, and the grayscale values of the respective pixels in the first display image; driving each of the backlight sources to emit light based on the reference grayscale value of the backlight section where the backlight source is disposed;
driving the first display panel to perform display based on the grayscale values of respective pixels in the first display image; and
driving the second display panel to perform display based on the grayscale values of respective pixels in the second display image.

2. The method according to claim 1 , wherein determining the reference grayscale value of each of the backlight sections based on the grayscale values of the respective pixels in the first image region corresponding to the backlight section comprises:
for each of the backlight sections, determining the reference grayscale value of the backlight section based on a maximum grayscale value of the respective pixels in the first image region corresponding to the backlight section, wherein the reference grayscale value is positively correlated with the maximum grayscale value.

3. The method according to claim 2 , wherein determining the reference grayscale value of the backlight section based on the maximum grayscale value of the respective pixels in the first image region corresponding to the backlight section comprises:
determining the reference grayscale value of the backlight section based on the maximum grayscale value and an average grayscale value of the respective pixels in the first image region corresponding to the backlight section, wherein the reference grayscale value is further positively correlated with the average grayscale value.

4. The method according to claim 1 , wherein determining the reference grayscale value of each of the backlight sections based on the grayscale values of the respective pixels in the first image region corresponding to the backlight section comprises:
acquiring a plurality of initial reference grayscale values by determining, for each of the backlight sections, the initial reference grayscale value of the backlight section based on the grayscale values of the respective pixels in the first image region corresponding to the backlight section; and
determining the reference grayscale value of each of the backlight sections based on a target initial reference grayscale value of a target backlight section of the plurality of backlight sections, wherein the target backlight section is disposed at a center of the plurality of backlight sections.

5. The method according to claim 1 , wherein determining the grayscale values of the respective pixels in the second display image based on the grayscale values of the respective pixels in the first target image, the grayscale values of the respective pixels in the second target image, the reference grayscale values of the plurality of backlight sections, and the grayscale values of the respective pixels in the first display image comprises:
updating the grayscale values of the respective pixels in the first target image based on the reference grayscale values of the plurality of backlight sections;
updating the grayscale values of the respective pixels in the second target image based on the reference grayscale values of the plurality of backlight sections; and
determining the grayscale values of the respective pixels in the second display image based on the grayscale values and updated grayscale values of the respective pixels in the first target image, the grayscale values and updated grayscale values of the respective pixels in the second target image, and the grayscale values of the respective pixels in the first display image.

6. The method according to claim 5 , wherein updating the grayscale values of the respective pixels in the first target image based on the reference grayscale values of the plurality of backlight sections comprises:
for each first pixel in each of the first image regions, determining a distance between the first pixel and each of at least one first target backlight section, wherein the at least one first target backlight section comprises a backlight section corresponding to the first image region where the first pixel is disposed, and a backlight region, a distance between which and the backlight section corresponding to the first image region where the first pixel is disposed is less than a distance threshold;
determining a light-splitting weight of light emitted by the at least one first target backlight section to the first pixel based on the distance between the first pixel and each first target backlight section; and
updating the grayscale value of the first pixel based on a reference grayscale value of the at least one first target backlight section and the light-splitting weight of the light emitted by each first target backlight section to the first pixel.

7. The method according to claim 6 , wherein determining the light-splitting weight of the light emitted by the at least one first target backlight section to the first pixel based on the distance between the first pixel and each first target backlight section comprises:
for each of the first pixels, acquiring the light-splitting weight of each first target backlight section to the first pixel by calculating the distance between the first pixel and each first target backlight section with a first point diffusion curve algorithm, wherein
the at least one first target backlight section comprises the backlight section corresponding to the first image region where the first pixel is disposed, and

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Shuo
• Shi Tiankuo
• Zhang Xiaomang
• Xi Yanhui
• Ji Zhihua
• Sun Yan
• Zhao Chenxi
• Peng Xiangjun
• Hou Yifan
• Chu Minglei

Classifications

• G09G2320/0686

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

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G3/3406

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title

• G09G2340/0428

  Gradation resolution change · CPC title