Display device, augmented reality apparatus and display method

Patent metadata

Field	Value
Publication number	US-12196965-B2
Application number	US-202117524643-A
Country	US
Kind code	B2
Filing date	Nov 11, 2021
Priority date	Jan 18, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A display device includes: a first coupling-in module configured to couple first image light into a light guide assembly at a preset first incident angle, thereby enabling the first image light to propagate in the light guide assembly by total reflection and to be incident in a coupling-out light-splitting module; a second coupling-in module configured to couple second image light into the light guide assembly at a preset second incident angle, thereby enabling the second image light to propagate in the light guide assembly and to be incident in the coupling-out light-splitting module; a coupling-out light-splitting module configured to, couple the first and second image light out from the light guide assembly to enter a first position area and a second position area of the human eye, respectively. The first and second image light are different light field information of an identical image; and are both collimated light.

First claim

What is claimed is:

1. A display device, comprising:
a first projection assembly;
a first coupling-in module corresponding to the first projection assembly;
a second projection assembly;
a second coupling-in module corresponding to the second projection assembly;
a light guide assembly; and
a coupling-out light-splitting module;
wherein the first coupling-in module is configured to couple first image light projected by the first projection assembly into the light guide assembly at a preset first incident angle, thereby enabling the first image light to propagate in the light guide assembly by total reflection according to a preset first total reflection angle and enabling the first image light to be incident in the coupling-out light-splitting module;
the second coupling-in module is configured to couple second image light projected by the second projection assembly into the light guide assembly at a preset second incident angle, thereby enabling the second image light to propagate in the light guide assembly by total reflection according to a preset second total reflection angle and enabling the second image light to be incident in the coupling-out light-splitting module;
the coupling-out light-splitting module is configured to, couple the first image light propagated in the light guide assembly by total reflection out from the light guide assembly at a first deflection angle to enter a first position area of the human eye and couple the second image light propagated in the light guide assembly by total reflection out from the light guide assembly at a second deflection angle to enter a second position area of the human eye; and
the first image light and the second image light are different light field information of an identical image; and the first image light and the second image light are both collimated light;
wherein the coupling-out light-splitting module is disposed at one side of the light guide assembly close to the human eye; an orthographic projection of the coupling-out light-splitting module onto the light guide assembly covers an orthographic projection of the human eye onto the light guide assembly; the coupling-out light-splitting module includes coupling-out light-splitting sub-modules which are corresponding to various sub-pixels in the first projection assembly and the second projection assembly in a one-to-one manner; the coupling-out light-splitting sub-module is a diffraction grating element;
the first coupling-in module and the second coupling-in module are disposed at two sides of the light guide assembly relative to the coupling-out light-splitting module, respectively;
the first projection assembly and the second projection assembly are disposed at one side of the light guide assembly close to the human eye; a light-emitting side of the first projection assembly is oriented towards the first coupling-in module; a light-emitting side of the second projection assembly is oriented towards the second coupling-in module;
the display device is configured as:
in a first time slot of one time period, projecting, by the first projection assembly, the first image light to the first coupling-in module; coupling, by the first coupling-in module, the first image light into the light guide assembly; in response to a loaded electric field, modulating, by each coupling-out light-splitting sub-module in the coupling-out light-splitting module, the first image light emitted by the corresponding sub-pixel, and emitting the modulated first image light to a first position area in the human eye;
in a second time slot of the one time period, projecting, by the second projection assembly, the second image light to the second coupling-in module; coupling, by the second coupling-in module, the second image light into the light guide assembly; in response to a loaded electric field, modulating, by each coupling-out light-splitting sub-module in the coupling-out light-splitting module, the second image light emitted by the corresponding sub-pixel, and emitting the modulated second image light to a second position area in the human eye;
wherein an interval between the first time slot and the second time slot is less than human visual residual time.

2. The display device according to claim 1 , wherein each of the first coupling-in module and the second coupling-in module is a diffraction grating element which is arranged at one side of the light guide assembly close to the human eye.

3. The display device according to claim 2 , wherein the diffraction grating element is one of a surface relief grating, a holographic Bragg grating, and a controllable nano-grating.

4. The display device according to claim 1 , wherein each of the first coupling-in module and the second coupling-in module is a planar reflective element, and the planar reflective elements are disposed at two sides of the light guide assembly at a preset inclination angle.

5. The display device according to claim 4 , wherein the planar reflective element is a wedge-shaped reflective surface coated with a film.

6. The display device according to claim 1 , wherein the coupling-out light-splitting module is disposed at one side of the light guide assembly close to the human eye; an orthographic projection of the coupling-out light-splitting module onto the light guide assembly covers an orthographic projection of the human eye onto the light guide assembly; the coupling-out light-splitting module includes coupling-out light-splitting sub-modules which are corresponding to various sub-pixels in the first projection assembly and the second projection assembly in a one-to-one manner; the coupling-out light-splitting sub-module is a micro-reflective element;
the first coupling-in module and the second coupling-in module are reflective grating elements disposed at one side of the light guide assembly away from the human eye; and the first coupling-in module and the second coupling-in module are respectively disposed at two sides of the light guide assembly relative to the coupling-out light-splitting module;
the first projection assembly and the second projection assembly are disposed at one side of the light guide assembly close to the human eye; a light-emitting side of the first projection assembly is oriented towards the first coupling-in module; a light-emitting side of the second projection assembly is oriented towards the second coupling-in module;
the display device is configured as,
in one time period, projecting, by the first projection assembly, the first image light to the first coupling-in module; coupling, by the first coupling-in module, the first image light into the light guide assembly; projecting, by the second projection assembly, the second image light to the second coupling-in module; coupling, by the second coupling-in module, the second image light into the light guide assembly; modulating, by each coupling-out light-splitting sub-module in the coupling-out light-splitting module, the first image light emitted by the corresponding sub-pixel in the first projection assembly, and emitting the modulated first image light to a first position area in the human eye; and modulating, by each coupling-out light-splitting sub-module in the coupling-out light-splitting module, the second image light emitted by the corresponding sub-pixel in the second projection assembly, and emitting the modulated second image light to a second position area in the human eye.

7. The display device according to claim 6 , wherein the coupling-out light-splitting sub-module is a micro-triangular prism; the micro-triangular prism includes a bottom side, a first lateral side, and a lateral second side; a size of the bottom side is corresponding to a size of the sub-pixel; the first lateral side is configured to, emit the fir

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yang Junxing
• Zhu Jinye
• Ma Sen
• Yu Jing
• Han Tianyang

Classifications

• G02B6/34

  utilising prism or grating {(G02B6/293 takes precedence)} · CPC title

• G02B2027/0127

  comprising devices increasing the depth of field · CPC title

• G02B2027/0134

  of stereoscopic type · CPC title

• G02B27/126

  The splitting element being a prism or prismatic array, including systems based on total internal reflection · CPC title

• H04N13/341

  using temporal multiplexing · CPC title