DISPLAY DEVICE AND VIRTUAL REALITY GLASSES

• US 20180081239A1
• Filed: 10/21/2016
• Published: 03/22/2018
• Est. Priority Date: 01/08/2016
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: ZHAO, Wenqing, DONG, Xue, CHEN, Xiaochuan, GAO, Jian, WANG, Qian, LU, Pengcheng, YANG, Ming, XU, Rui, WANG, Lei, NIU, Xiaochen
• Granted Patent: US 10,234,718 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 2027/0105 Holograms with particular structures
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/136 Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit G02F1/135 takes precedence

Abstract

Embodiments of the present disclosure provide a display device and virtual reality glasses. The display device comprises an array substrate, which comprises a base substrate, a plurality of sub-pixels arranged on the base substrate, and a grating arranged on the base substrate. The grating comprises a plurality of sub-gratings having different structures, and each sub-grating comprises an adjusting part for adjusting propagation direction of light rays, so that light rays exiting from the adjusting part converge to a predetermined spatial position. The array substrate further comprises a plurality of preset areas, and the plurality of sub-gratings correspond to sub-pixels located in different preset areas respectively. The display device further comprises a light source disposed beside the base substrate. The light rays emitted from the light source are parallel light. The light rays are totally reflected in the array substrate except in regions where the adjusting parts of sub-gratings are located.

Claims

1. A display device, comprising:

an array substrate comprising a base substrate, a plurality of sub-pixels arranged on the base substrate, and a grating arranged on the base substrate, the grating comprising a plurality of sub-gratings having different structures, each sub-grating comprising an adjusting part for adjusting propagation direction of light rays, and light rays exiting from the adjusting part converging to a predetermined spatial position;

the array substrate further comprising a plurality of preset areas, and the plurality of sub-gratings respectively corresponding to sub-pixels located in different preset areas; and

a light source disposed beside the base substrate, light rays emitted from the light source being parallel light, and the light rays being totally reflected in the array substrate except in regions where adjusting parts of sub-gratings are located.

2. The display device according to claim 1, wherein an area where one sub-pixel is located is a preset area and one sub-pixel corresponds to a sub-grating or sub-gratings with one structure.

3. The display device according to claim 2, wherein all of the sub-gratings are slit grating, and the adjusting parts of the sub-gratings are slits included in the sub-gratings.

4. The display device according to claim 3, wherein incident angle of light rays incident into all of the sub-gratings is α

, and α

is an angle between the light rays emitted from the light source and a plane where the base substrate is located;

the sub-gratings comprise first sub-grating(s) corresponding to sub-pixel(s) located on a center of the array substrate, and second sub-gratings corresponding to other sub-pixels;

exit angle of light rays exiting from the first sub-grating is θ

₁, and the exit angle θ

₁ is an angle between the light rays exiting from the first sub-grating and a plane where the grating is located, and θ

₁90°

.

5. The display device according to claim 4, wherein extension direction of slits included in the first sub-grating is parallel to a side surface of the base substrate that is adjacent to the light source, grating constant of the first sub-grating is d₁,

6. The display device according to claim 5, wherein all of the second sub-gratings are symmetrically distributed about a center, and the center of symmetry is the center of the array substrate.

7. The display device according to claim 6, wherein a direction outwards from the first sub-grating and perpendicularly pointing towards the side surface of the base substrate that is adjacent to the light source is a predetermined direction, and exit angle of light rays exiting from a second sub-grating distributed in the predetermined direction is θ

₂,

8. The display device according to claim 7, wherein grating constant of the second sub-grating is d₂,

9. The display device according to claim 8, wherein the valid number and width of slits included in respective second sub-gratings distributed in the predetermined direction are the same as the first sub-grating, and the slits included in respective second sub-gratings have an inclination angle β

, and

10. The display device according to claim 3, wherein light intensity of light rays exiting from a sub-grating is I,

11. The display device according to claim 2, wherein the sub-gratings comprise first sub-grating(s) corresponding to sub-pixel(s) located on a center of the array substrate, and second sub-gratings corresponding to other sub-pixels;

the first sub-grating is slit grating, and the adjusting part of the first sub-grating is slits included in the first sub-grating;

all of the second sub-gratings are blazed grating, and the adjusting parts of the second sub-gratings are respectively groove surfaces of the second sub-gratings.

12. The display device according to claim 11, wherein extension direction of the slits included in the first sub-grating is parallel to a side surface of the base substrate that is adjacent to the light source, grating constant of the first sub-grating is d₁,

14. The display device according to claim 11, wherein a direction outwards from the first sub-grating and perpendicularly pointing towards the side surface of the base substrate that is adjacent to the light source is a predetermined direction, blazing angle of a second sub-grating distributed in the predetermined direction is γ

,

15. The display device according to claim 2, wherein all of the sub-gratings are diffractive gratings with surfaces being provided with bar-shaped protrusions and bar-shaped grooves.

16. The display device according to claim 1, wherein an area where one sub-pixel is located comprises a plurality of preset areas, and an individual sub-pixel corresponds to a plurality of sub-gratings having different structures so that light rays exiting from the plurality of sub-gratings having different structures and corresponding to the individual pixel cover a certain range.

17. The display device according to claim 16, wherein the plurality of sub-gratings having different structures and corresponding to the individual pixel are all slit grating, the valid number and width of slits included in respective sub-gratings are the same, and the slits included in the sub-gratings having different structures have different inclination angles β

, wherein the inclination angles β

are angles between extension directions of slits in respective sub-gratings and the side surface of the base substrate that is adjacent to the light source.

18. The display device according to claim 17, wherein a maximum difference between inclination angles β

of the slits included in the plurality of sub-gratings having different structures and corresponding to an individual sub-pixel is 30°

-40°

.

19. The display device according to claim 1, wherein an area where adjacent multiple sub-pixels are located is a preset area, and the adjacent multiple sub-pixels located in the same preset area correspond to sub-grating(s) with one structure.

20. The display device according to claim 1, further comprises a color film substrate arranged opposite to the array substrate, and a liquid crystal molecularly layer arranged between the array substrate and the color film substrate, the light rays emitted from the light source are linearly polarized light, and only a side of the color film substrate facing away from the array substrate is provided with an upper polarizer;

or, the light rays emitted from the light source is natural light, and in addition to the upper polarizer provided on the side of the color film substrate facing away from the array substrate, the display device further comprises a lower polarizer which is arranged between the light source and the side surface of the base substrate or arranged on the grating.

21. Virtual reality glasses, comprising housing, wherein the virtual reality glasses further comprise two display devices according to claim 1 being located in the housing, wherein the predetermined spatial position of one of the display devices corresponds to a user'"'"'s left eye, and the predetermined spatial position of the other of the display devices corresponds to the user'"'"'s right eye.

13. (canceled)