Anti-peep display, liquid crystal display device and anti-peep component

• US 11,092,828 B2
• Filed: 11/24/2017
• Issued: 08/17/2021
• Est. Priority Date: 03/02/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Li, Zhongxiao, Chen, Xiaochuan, Zhao, Wenqing, Yang, Ming
• Primary Examiner(s): Lau, Edmond C
• Application Number:
  US16/072,948
• Publication Number:
  US 20210173240A1
• Time in Patent Office: 1,362 Days
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 2201/30 grating

Abstract

Provided are an anti-peep display, a liquid crystal display device and an anti-peep component, the anti-peep display includes a backlight source, a liquid crystal display screen, and a grating layer and a black matrix layer which are arranged between the liquid crystal layer and the backlight source; the grating layer includes a grating layer controllable light-blocking area and a grating layer light-transmitting area that are alternately arranged; the black matrix layer includes a black matrix layer light-blocking area and a black matrix layer light-transmitting area that are alternately arranged; the grating layer light-transmitting area and the black matrix layer light-transmitting area are in one-to-one correspondence, and the grating layer light-transmitting area is aligned with the black matrix layer light-transmitting area corresponding to the grating layer light-transmitting area in a direction perpendicular to the liquid crystal layer.

Claims

1. An anti-peep display, comprising:

a backlight source;

a liquid crystal display screen comprising a liquid crystal layer;

a grating layer located between the liquid crystal layer and the backlight source and comprising a grating layer controllable light-blocking area and a grating layer light-transmitting area that are alternately arranged; and

a black matrix layer located between the liquid crystal layer and the backlight source and comprising a black matrix layer light-blocking area and a black matrix layer light-transmitting area that are alternately arranged,

wherein, the grating layer light-transmitting area and the black matrix layer light-transmitting area are in one-to-one correspondence, and the grating layer light-transmitting area is aligned with the black matrix layer light-transmitting area corresponding to the grating layer light-transmitting area in a direction perpendicular to the liquid crystal layer.

2. The anti-peep display according to claim 1, wherein a width of the black matrix layer light-blocking area is less than a width of a sub-pixel of the liquid crystal display screen.

3. The anti-peep display according to claim 1, wherein the grating layer comprises an upper electrode layer and a lower electrode layer that are oppositely arranged, and a liquid crystal unit arranged between the upper electrode layer and the lower electrode layer;

wherein the upper electrode layer, the liquid crystal unit and the lower electrode layer form the grating layer controllable light-blocking area, and the grating layer light-transmitting area is formed between two adjacent liquid crystal units.

4. The anti-peep display according to claim 1, wherein the black matrix layer comprises the black matrix layer light-blocking area made of a lightproof material, and the black matrix layer light-transmitting area is formed between two adjacent black matrix layer light-blocking areas.

5. The anti-peep display according to claim 1, wherein when the anti-peep display is in an anti-peep display mode, a distance between the grating layer and the black matrix layer, a distance between the two adjacent grating layer controllable light-blocking areas and a distance between the two adjacent black matrix layer light-blocking areas are arranged, so as enable light with an incident angle larger than an anti-peer angle to be blocked by the grating layer controllable light-blocking area, or to be totally reflected before entering the liquid crystal display screen.

6. The anti-peep display according to claim 1, wherein a number of the grating layer is one;

a number of the black matrix layers is two, namely a first black matrix layer and a second black matrix layer;

a distance between the first black matrix layer and the liquid crystal layer is less than a distance between the second black matrix layer and the liquid crystal layer;

a width of a single black matrix layer light-blocking area of the second black matrix layer is less than a width of a single black matrix layer light-transmitting area of the first black matrix layer; and

a sum of a width of a single black matrix layer light-blocking area of the first black matrix layer and the width of the single black matrix layer light-blocking area of the second black matrix layer is less than a width of a sub-pixel of the liquid crystal display.

7. The anti-peep display according to claim 6, wherein the first black matrix layer, the second black matrix layer and the grating layer are sequentially arranged from the liquid crystal layer to the backlight source.

8. The anti-peep display according to claim 7, wherein a distance between the first black matrix layer and the second black matrix layer is equal to a distance between the second black matrix layer and the grating layer.

9. The anti-peep display according to claim 6, wherein the first black matrix layer, the grating layer and the second black matrix layer are sequentially arranged from the liquid crystal layer to the backlight source.

10. The anti-peep display according to claim 9, wherein a distance between the first black matrix layer and the grating layer is equal to a distance between the grating layer and the second black matrix layer.

11. The anti-peep display according to claim 1, wherein the width of the black matrix layer light-blocking area is equal to a width of the grating layer controllable light-blocking area.

12. The anti-peep display according to claim 1, further comprising a filling layer configured to adjust a layer spacing, wherein the filling layer is arranged between the grating layer and the black matrix layer, or between two adjacent black matrix layers.

13. A liquid crystal display device, comprising an anti-peep display wherein the anti-peep display comprises

a backlight source;

a liquid crystal display screen comprising a liquid crystal layer;

a grating layer located between the liquid crystal layer and the backlight source and comprising a grating layer controllable light-blocking area and a grating layer light-transmitting area that are alternately arranged; and

a black matrix layer located between the liquid crystal layer and the backlight source and comprising a black matrix layer light-blocking area and a black matrix layer light-transmitting area that are alternately arranged,

wherein, the grating layer light-transmitting area and the black matrix layer light-transmitting area are in one-to-one correspondence, and the grating layer light-transmitting area is aligned with the black matrix layer light-transmitting area corresponding to the grating layer light-transmitting area in a direction perpendicular to the light crystal layer.

14. An anti-peep component, comprising:

an upper substrate and a lower substrate that are oppositely arranged, and a grating layer and a black matrix layer that are located between the upper substrate and the lower substrate, wherein the grating layer comprises a grating layer controllable light-blocking area and a grating layer light-transmitting area that are alternately arranged;

the black matrix layer comprises a black matrix layer light-blocking area and a black matrix layer light-transmitting area that are alternately arranged; and

the grating layer light-transmitting area and the black matrix layer light-transmitting area are in one-to-one correspondence, and the grating layer light-transmitting area is aligned with a black matrix layer light-transmitting area corresponding to the grating layer light-transmitting area in a direction perpendicular to the upper substrate.

15. The anti-peep component according to claim 14, wherein the grating layer comprises an upper electrode layer and a lower electrode layer that are oppositely arranged, and a liquid crystal unit arranged between the upper electrode layer and the lower electrode layer, the upper electrode layer, the liquid crystal unit and the lower electrode layer form the grating layer controllable light-blocking area, and the grating layer light-transmitting area is formed between two adjacent liquid crystal units.

16. The anti-peep component according to claim 14, wherein the black matrix layer comprises the black matrix layer light-blocking area made of a lightproof material;

and the black matrix layer light-transmitting area is formed between two adjacent black matrix layer light-blocking areas.

17. The anti-peep component according to claim 14, wherein a number of the grating layer is one;

a number of the black matrix layers is two, namely a first black matrix layer and a second black matrix layer; and

a width of a single black matrix layer light-blocking area of the second black matrix layer is less than a width of a single black matrix layer light-transmitting area of the first black matrix layer.

18. The anti-peep component according to claim 17, wherein the first black matrix layer, the second black matrix layer and the grating layer are sequentially arranged from the upper substrate to the lower substrate, and a distance between the first black matrix layer and the second black matrix layer is equal to a distance between the second black matrix layer and the grating layer.

19. The anti-peep component according to claim 17, wherein the first black matrix layer, the grating layer and the second black matrix layer are sequentially arranged from the upper substrate to the lower substrate, and a distance between the first black matrix layer and the grating layer is equal to a distance between the grating layer and the second black matrix layer.

20. The anti-peep component according to claim 14, further comprising a filling layer configured to adjust a layer spacing, wherein the filling layer is arranged between the grating layer and the black matrix layer, or between two adjacent black matrix layers.