Display module, method of driving same, and display device

Patent metadata

Field	Value
Publication number	US-12027128-B2
Application number	US-202318205710-A
Country	US
Kind code	B2
Filing date	Jun 5, 2023
Priority date	Jan 28, 2021
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A display module and a display device are provided. In the display module, a liquid crystal display panel has a plurality of display subareas. A color backlight module has a plurality of backlight subareas in a one-to-one correspondence to the plurality of display subareas. A driving apparatus may sequentially drive liquid crystal molecules in the display subareas to turn over, and after driving the liquid crystal molecules in each display subarea to turn over, drive a light-emitting element of one color included in each backlight source in one corresponding backlight subarea to emit light.

First claim

What is claimed is:

1. A display module, comprising:
a color backlight module and a liquid crystal display module stacked in sequence, wherein the liquid crystal display module comprises a liquid crystal display panel having a plurality of display subareas arranged along a column direction, and the color backlight module has a plurality of backlight subareas in a one-to-one correspondence to the plurality of display subareas and comprises a plurality of backlight sources located in each of the backlight subareas, each of the backlight sources comprising light-emitting elements of N colors, N being a positive integer greater than 1; and
a driving apparatus connected to the color backlight module and the liquid crystal display module respectively and configured to sequentially execute N driving processes in response to receiving data of one frame of image, wherein an i th driving process comprises:
sequentially driving the display subareas to switch from a non-light transmitting state to a light transmitting state, and after driving each display subarea to switch to the light transmitting state, driving a light-emitting element of an i th color comprised in each of the backlight sources in one backlight subarea corresponding to the display subarea as driven to emit light, i being a positive integer not greater than N;
wherein the display module further comprises a plurality of light assigning assemblies between the liquid crystal display module and the color backlight module, wherein each of the plurality of light assigning assemblies comprises a first end, a second end, and a body portion connecting the first end and the second end, wherein the first end is more distal from the liquid crystal display module than the second end, the plurality of backlight sources are disposed on the first ends of the plurality of light assigning assemblies, an orthogonal projection of each of the plurality of backlight sources on the liquid crystal display module is overlapped with an orthogonal projection of the corresponding light assigning assembly on the liquid crystal display module, and a light exiting face of each of the plurality of backlight sources faces towards the second end of the corresponding light assigning assembly.

2. The display module according to claim 1 , wherein the plurality of light assigning assemblies are arranged in a one-to-one correspondence with the plurality of backlight sources, and the orthogonal projection of each of the plurality of backlight sources on the liquid crystal display module is within an orthogonal projection of the first end of the corresponding light assigning assembly on the liquid crystal display module.

3. The display module according to claim 2 , wherein a center point of each of the plurality of backlight sources is overlapped with an axis line of the corresponding light assigning assembly.

4. The display module according to claim 1 , wherein a size of the first end is less than a size of the second end, and at least one of the following requirements is met:
an orthogonal projection of the first end on the liquid crystal display module is within an orthogonal projection of the second end on the liquid crystal display module;
a center of the orthogonal projection of the first end on the liquid crystal display module is overlapped with a center of the orthogonal projection of the second end on the liquid crystal display module; and
an orthogonal projection of an inner wall face of the body portion on the liquid crystal display module is within the orthogonal projection of the second end on the liquid crystal display module.

5. The display module according to claim 1 , wherein the light assigning assembly comprises a reflective cup, wherein
a cup body of the reflective cup is the body portion of the light assigning assembly, a lower opening of the reflective cup is the first end of the light assigning assembly, and an upper opening of the reflective cup is the second end of the light assigning assembly; wherein in a direction perpendicular to the liquid crystal display module, a distance between the lower opening of the reflective cup and the upper opening of the reflective cup is greater than or equal to 10 mm, and is less than or equal to 30 mm; and
a plurality of reflective cups are an integrated structure, and an inner wall face of the cup body of the reflective cup comprises a plurality of wall sub-faces, wherein an included angle between two adjacent wall sub-faces is a chamfer.

6. The display module according to claim 1 , wherein the light assigning assembly comprises a lens, wherein
a lens body of the lens is the body portion of the light assigning assembly, a first end of the lens body is the first end of the light assigning assembly, a second end of the lens body is the second end of the light assigning assembly, and the lens body is a conical shell comprising a cavity;
the cavity of the lens body is provided with a first quadric surface, an inner wall of the lens body is provided with a second quadric surface, wherein the first quadric surface is convex toward the first end of the lens body, and the second quadric surface is convex toward the second end of the lens body;
light from the backlight source within a first incidence angle range is collimated and emitted from the second end of the lens body upon being refracted by the first quadric surface, and incidence light from the backlight source within a second incidence angle range is collimated and emitted from the second end of the lens body upon being refracted by the second quadric surface; a maximum angle within the first incidence angle range is less than a minimum angle within the second incidence angle range, and the first incidence angle range is an incidence angle range of light from the backlight source directly emitted from the second end of the lens body without being reflected by the inner wall of the lens body.

7. The display module according to claim 6 , wherein the cavity of the lens body is provided with a third quadric surface, wherein the third quadric surface is convex toward the second end of the lens body and is disposed on a side, distal from the first end of the lens body, of the first quadric surface, and an orthogonal projection of the third quadric surface on the liquid crystal display module is overlapped with an orthogonal projection of the first quadric surface on the liquid crystal display module, wherein the light from the backlight source within the first incidence angle range is collimated and emitted from the second end of the lens body through the third quadric surface upon being refracted by the first quadric surface;
wherein each the first quadric surface, the second quadric surface, the third quadric surface comprises any one of a spherical face, an ellipsoidal spherical face, and an ellipsoidal paraboloid face.

8. The display module according to claim 7 , wherein the orthogonal projection of the third quadric surface on the liquid crystal display module covers the orthogonal projection of the first quadric surface on the liquid crystal display module.

9. The display module according to claim 8 , wherein the lens comprises a first curved lens, a first fixed cavity, a second curved lens, and a second fixed cavity, wherein
a first end of the first fixed cavity is affixed on the first end of the lens body, the first curved lens is affixed on a second end of the first fixed cavity, and a convex surface of the first curved lens forms the first quadric surface; and
a first end of the second fixed cavity is affixed on the second end of the lens body, the second curved lens is affixed on a second end of the second fixed cavity, and a convex surface of the second curved lens forms the third quadric surface.

Assignees

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

Inventors

• Ma Qing
• Han Rui
• Li Pengtao
• Yoon Daekeun
• Yu Jie
• Chi Weining
• Han Tianyang
• Yu Jing

Classifications

• G09G3/3413

  Details of control of colour illumination sources · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2320/0233

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

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G3/3607

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title