Near-eye display apparatus

Patent metadata

Field	Value
Publication number	US-12481095-B2
Application number	US-202117921309-A
Country	US
Kind code	B2
Filing date	Oct 11, 2021
Priority date	Nov 9, 2020
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

Provided is a near-eye display apparatus, comprising: a first display ( 11 ), used for displaying a first image, entering a beam splitter ( 30 ) by means of a first imaging lens ( 12 ); a second display ( 21 ), used for displaying a second image, entering the beam splitter ( 30 ) by means of a second imaging lens ( 22 ), the beam splitter ( 30 ) being used for transmitting the imaging light beam of the first imaging lens ( 12 ) and reflecting the imaging light beam of the second imaging lens ( 22 ); a waveguide plate ( 40 ), located on the light exit path of the beam splitter ( 30 ), and used for receiving outgoing light from the beam splitter ( 30 ) and transmitting same; the waveguide plate ( 40 ) is internally provided with a light-taking component ( 400 ), the light-taking component ( 400 ) being used for reflecting the imaging light beam transmitted in the waveguide plate ( 40 ) toward a position where a human eye is located. The image distances of the first imaging lens ( 12 ) and the second imaging lens ( 22 ) are different, thus it is possible to display the first image and the second image on two image planes, and, by means of adjusting the human eye, when observing an image of an image plane the image of the other image plane is blurry, which is consistent with a sensation of viewing an actual scene, thus eliminating vergence-accommodation conflict.

First claim

What is claimed is:

1 . A near-eye display apparatus, comprising:
a first display, configured to display a first image; a second display, configured to display a second image; a first imaging lens, located on a light emitting side of the first display and configured to perform imaging on the first image; and a second imaging lens, located on a light emitting side of the second display and configured to perform imaging on the second image, wherein an image distance of the first imaging lens is different from an image distance of the second imaging lens; a beam splitter, located on a side of the first imaging lens facing away from the first display and on a side of the second imaging lens facing away from the second display, and configured to transmit an imaging light beam of the first imaging lens and reflecting an imaging light beam of the second imaging lens; and a waveguide plate, located on a light emitting path of the beam splitter and configured to receive the imaging light beam of the first imaging lens and the imaging light beam of the second imaging lens from the beam splitter and transmit the imaging light beam of the first imaging lens and the imaging light beam of the second imaging lens, wherein a light extraction component is arranged in the waveguide plate and configured to reflect the imaging light beam of the first imaging lens and the imaging light beam of the second imaging lens that are transmitted in the waveguide plate toward a position where a human eye is located; wherein the waveguide plate comprises: a light entering surface, a light emitting surface and a back surface, wherein the light emitting surface is opposite to the back surface, the light entering surface is located at a same end of the light emitting surface and the back surface and connected with the light emitting surface and the back surface, and the light entering surface is inclined relative to the light emitting surface; wherein the light extraction component comprises a transflective layer, the transflective layer is located between the light emitting surface and the back surface, and a set included angle is formed between the transflective layer and the light emitting surface, and the transflective layer is configured to partially transmit an imaging light beam and partially reflect an imaging light beam toward the light emitting surface; wherein the light extraction component comprises a plurality of transflective layers, and the respective transflective layers are distributed in parallel at equal intervals and are inclined relative to the light emitting surface; wherein an included angle between the light entering surface and the light emitting surface is twice the included angle between the transflective layer and the light emitting surface.

2 . The near-eye display apparatus according to claim 1 , wherein a distance between the first imaging lens and the first display and a distance between the second imaging lens and the second display are the same, and a focal length of the first imaging lens is different from a focal length of the second imaging lens; or
a focal length of the first imaging lens and a focal length of the second imaging lens are the same, and a distance between the first imaging lens and the first display and a distance between the second imaging lens and the second display are different.

3 . The near-eye display apparatus according to claim 2 , wherein the distance between the first imaging lens and the first display is smaller than the focal length of the first imaging lens, and the distance between the second imaging lens and the second display is smaller than the focal length of the second imaging lens.

4 . The near-eye display apparatus according to claim 1 , wherein a quantity of the transflective layers is 2 to 6.

5 . The near-eye display apparatus according to claim 1 , wherein a reflectivity of the transflective layer is increased with increasing of a distance between the transflective layer and the light entering surface.

6 . The near-eye display apparatus according to claim 1 , wherein a material of the waveguide plate is glass or plastic.

7 . The near-eye display apparatus according to claim 1 , wherein the beam splitter comprises: a first prism and a second prism being the same in structure; the first prism and the second prism each comprise a slope, and the slope of the first prism overlaps with the slope of the second prism so that the first prism and the second prism constitute a cuboid structure; a beam splitting layer is arranged on an overlapping surface of the first prism and the second prism;
the second prism is arranged close to the light entering surface of the waveguide plate, and the first prism is located on a side of the second prism facing away from the waveguide plate; the first prism is arranged close to the first imaging lens, and the second prism is arranged facing the second imaging lens; and a surface of the second prism facing the light entering surface of the waveguide plate is a light emitting surface of the beam splitter, and a surface of the first prism facing the first imaging lens is a light entering surface of the first prism, and a surface of the second prism facing the second imaging lens is a light entering surface of the second prism.

8 . The near-eye display apparatus according to claim 7 , wherein the beam splitting layer is a semi-transmitting and semi-reflecting layer or a polarizing beamsplitting dielectric layer.

9 . The near-eye display apparatus according to claim 7 , wherein a surface of the first imaging lens close to the first prism is in contact with the light entering surface of the first prism through a vertex of an optical axis; and a surface of the second imaging lens close to the second prism is in contact with the light entering surface of the second prism through a vertex of an optical axis.

10 . The near-eye display apparatus according to claim 7 , wherein the light emitting surface of the beam splitter is attached to the light entering surface of the waveguide plate.

11 . The near-eye display apparatus according to claim 1 , wherein the first imaging lens comprises at least one lens; and the second imaging lens comprises at least one lens.

12 . The near-eye display apparatus according to claim 11 , wherein the lens in the first imaging lens adopts one of a spherical lens, an aspheric lens or a freeform lens; and the lens in the second imaging lens adopts one of a spherical lens, an aspheric lens or a freeform lens.

13 . The near-eye display apparatus according to claim 12 , wherein a material of the lens in the first imaging lens adopts glass or plastic; and a material of the lens in the second imaging lens adopts glass or plastic.

14 . The near-eye display apparatus according to claim 1 , wherein the first display and the second display adopts one of a liquid crystal display, an organic light emitting diode display, a micro-organic light emitting diode display, a liquid crystal on silicon display, a light emitting diode display, a micro-light emitting diode display or a digital light processing display.

Assignees

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

Inventors

• Wang Chenru
• Han Na
• Dong Ruijun
• Li Ke
• Wu Yulong
• Bai Jiarong
• Chen Lili
• Zhang Hao

Classifications

• G02B27/10 Primary

  Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905}) · CPC title

• G02B27/0172

  characterised by optical features · CPC title

• G02B2027/0134

  of stereoscopic type · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/0123

  comprising devices increasing the field of view · CPC title