Grating substrate, display substrate, display device and display method thereof

Patent metadata

Field	Value
Publication number	US-11774776-B2
Application number	US-201916956074-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Jan 3, 2019
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

The grating substrate includes a first base substrate and a plurality of grating units on the first base substrate. The grating unit includes two control layers, a barrier structure between the two control layers, and a plurality of movable particles in a closed cavity surrounded by the barrier structure and the two control layers. The two control layers include a first control layer and a second control layer. The first control layer is located on a side of the second control layer distal from the first base substrate, and the two control layers are configured to control movement of the plurality of particles. The particles satisfy at least one of the following conditions: the particles have a refractive index smaller than a refractive index of the first control layer, or the particles are non-transparent particles.

First claim

What is claimed is:

1. A display substrate, comprising: a light emitting substrate and a grating substrate comprising: a first base substrate and a plurality of grating units on the first base substrate,
wherein each of the grating units comprises two control layers, a barrier structure between the two control layers, and a plurality of movable particles in a closed cavity surrounded by the barrier structure and the two control layers, wherein the two control layers comprise a first control layer and a second control layer, the first control layer being located on a side of the second control layer distal from the first base substrate, and the two control layers being configured to control movement of the particles;
wherein the particles have a refractive index smaller than a refractive index of the first control layer, and the particles are non-transparent particles; and
the first control layer in each of the grating units comprises a first transparent electrode and a reflective film that are stacked, the reflective film being located on a side of the first transparent electrode proximal to the first base substrate, the second control layer in each of the grating units comprises a second transparent electrode, the particles are charged particles, wherein the charged particles have a refractive index smaller than a refractive index of the reflective film, such that the particles in the closed cavity are moved to a surface of the reflective film proximal to the second control layer by applying a first voltage between the first transparent electrode and the second transparent electrode, to inhibit each of the grating units from transmitting light; and
wherein the light emitting substrate comprises a second base substrate and a plurality of light emitting units on the second base substrate, the light emitting substrate and the grating substrate are oppositely arranged, and the light emitting units are arranged in one-to-one correspondence with the grating units in the grating substrate.

2. The display substrate according to claim 1 , wherein each of the light emitting units comprises a third electrode, a light emitting layer, and a fourth transparent electrode that are stacked along a direction away from the second base substrate; and
the fourth transparent electrode in each of the light emitting units is multiplexed with a first transparent electrode in a corresponding grating unit.

3. The display substrate according to claim 1 , wherein each of the light emitting units comprises a third electrode, a light emitting layer, a fourth transparent electrode, and an insulating layer that are stacked along a direction away from the second base substrate; and
the first transparent electrode in each of the grating units is located on a side of the insulating layer in a corresponding light emitting unit distal from the second base substrate.

4. The display substrate according to claim 1 , further comprising a baffle structure between two adjacent light emitting units, wherein one end of the baffle structure is connected to the first base substrate in the grating substrate, and the other end of the baffle structure is connected to the second base substrate.

5. The display substrate according to claim 4 , wherein the baffle structure is a non-light-transmitting structure.

6. The display substrate according to claim 1 , wherein the display substrate is one of an organic light emitting diode display substrate and a quantum dot light emitting diode display substrate.

7. A display device, comprising a display substrate comprising: a light emitting substrate and a grating substrate comprising: a first base substrate and a plurality of grating units on the first base substrate,
wherein each of the grating units comprises two control layers, a barrier structure between the two control layers, and a plurality of movable particles in a closed cavity surrounded by the barrier structure and the two control layers, wherein the two control layers comprise a first control layer and a second control layer, the first control layer being located on a side of the second control layer distal from the first base substrate, and the two control layers being configured to control movement of the particles;
wherein the particles have a refractive index smaller than a refractive index of the first control layer, and the particles are non-transparent particles; and
the first control layer comprises a first transparent electrode and a reflective film that are stacked, the reflective film being located on a side of the first transparent electrode proximal to the first base substrate, the second control layer comprises a second transparent electrode, the particles are charged particles, wherein the charged particles have a refractive index smaller than a refractive index of the reflective film, such that the particles in the closed cavity are moved to a surface of the reflective film proximal to the second control layer by applying a first voltage between the first transparent electrode and the second transparent electrode, to inhibit each of the grating units from transmitting light; and
wherein the light emitting substrate comprises a second base substrate and a plurality of light emitting units on the second base substrate, the light emitting substrate and the grating substrate are oppositely arranged, and the light emitting units are arranged in one-to-one correspondence with the grating units in the grating substrate.

8. A display method for a display device, applied to the display device as defined in claim 7 , the display device comprising a plurality of display units arranged in a matrix, and each of the display units comprising one of the light emitting units and one of the grating units which is stacked with the light emitting unit, the method comprising:
acquiring a three-dimensional display direction of the display device when the display device is configured to display a three-dimensional image;
performing, when the three-dimensional display direction is a row arrangement direction of the display units, a darkening operation on each of display units in a target column to enable each of the display units in the target column to be in a dark state; and
performing, when the three-dimensional display direction is a column arrangement direction of the display units, the darkening operation on each of display units in a target row to enable each of the display units in the target row to be in the dark state;
wherein performing the darkening operation on a target display unit comprises:
moving, under a control action of a first control layer and a second control layer in a grating unit of the target display unit, a plurality of the particles in a closed cavity of the grating unit of the target display unit to a target surface, to inhibit the grating unit of the target display unit from transmitting light, wherein the target surface comprises an inner surface of the first control layer in the grating unit of the target display unit.

9. The method according to claim 8 , wherein moving, under the control action of the first control layer and the second control layer in the grating unit of the target display unit, the particles in the closed cavity of the grating unit of the target display unit to the target surface, comprises:
moving, by applying a first voltage between the first transparent electrode and the second transparent electrode in the grating unit of the target display unit, the particles in the closed cavity of the grating unit of the target display unit to a surface of the first transparent electrode in the grating unit of the target display unit proximal to the second control layer in the grating unit of the target display unit.

10. The met

Assignees

• Fuzhou Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd
• Fuzhou Bue Optoelectronics Tech Co Ltd

Inventors

• Tao Wenchang
• Li Zongxiang
• Lin Linlin
• Qiu Xinmao
• Liu Zuwen
• Wang Jin
• Shi Changhong
• Lv Yaochao
• Liao Jiamin
• Liu Yao
• Chen Xi
• Zhou Min
• Hong Guichun
• Wu Zhendian
• Cheng Hao
• Huang Yawen
• Zhuang Zihua

Classifications

• G02B30/31 Primary

  involving active parallax barriers (involving directional light or back-light sources G02B30/33) · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/167

  by electrophoresis · CPC title