LIGHT HOMOGENIZING STRUCTURE, FRONT LIGHT SOURCE AND DISPLAY DEVICE

• US 20190064599A1
• Filed: 03/19/2018
• Published: 02/28/2019
• Est. Priority Date: 08/31/2017
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Fuzhou BOE Optoelectronics Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Fuzhou BOE Optoelectronics Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: ZHAO, Hongyu, DIAO, Kai, LIU, Jie, BAO, Zongjie, ZHANG, Han, CHU, Yang, SUN, Wenjia
• Granted Patent: US 10,642,102 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/143 using macroscopically faceted or segmented reflective surfaces
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133616 Front illuminating devices

Abstract

The present disclosure provides a light homogenizing structure, a front light source and a display device. The light homogenizing structure comprises a transparent substrate and a plurality of light homogenizing units arranged on a surface of the transparent substrate facing the display panel; wherein a surface of each of the light homogenizing units away from the transparent substrate is a reflective surface tilted relative to the transparent substrate, light rays emitted from the light-emitting unit facing a light entry surface of the light homogenizing structure are incident into the display panel after being reflected on the reflective surface, the light entry surface is other than a surface of the light homogenizing structure facing the display panel and its opposite surface, and an orthographic projection of one of the light homogenizing units on the display panel is located on a border between pixels of the display panel.

Claims

1. A light homogenizing structure arranged on a display side of a display panel, comprising:

a transparent substrate and a plurality of light homogenizing units arranged on a surface of the transparent substrate facing the display panel;

wherein a surface of each of the light homogenizing units away from the transparent substrate is a reflective surface tilted relative to the transparent substrate, light rays emitted from light-emitting unit facing a light entry surface of the light homogenizing structure are incident into the display panel after being reflected on the reflective surface, the light entry surface of the light homogenizing structure is a surface of the light homogenizing structure other than a surface facing the display panel and its opposite surface, and an orthographic projection of one of the light homogenizing units on the display panel is located on a border between pixels of the display panel.

2. The light homogenizing structure according to claim 1, wherein the plurality of light homogenizing units are a plurality of columnar structure groups arranged in a first direction, each of which comprises at least one columnar structure arranged in an array in a second direction, wherein one end of each of the at least one columnar structure is arranged on the transparent substrate, and another end thereof is provided with the reflective surface;

the first direction is parallel to the light entry surface of the light homogenizing structure, and the second direction is perpendicular to the light entry surface of the light homogenizing structure.

3. The light homogenizing structure according to claim 2, wherein

when observed at least in the second direction, at least two of the at least one columnar structure in each of the columnar structure groups are arranged in a staggered manner.

4. The light homogenizing structure according to claim 2, wherein

each of the at least one columnar structure has same height;

or

heights of at least two columnar structures in each of the columnar structure groups are increased successively in a direction away from the light-emitting unit.

5. The light homogenizing structure according to claim 2, wherein

the columnar structures correspond, on a one-to-one basis, to pixels in the display panel.

6. The light homogenizing structure according to claim 2, wherein reflective surfaces of a plurality of columnar structures in each of the columnar structure groups are not parallel with each other.

7. The light homogenizing structure according to claim 2, wherein heights of at least two columnar structures in each of the columnar structure groups are increased successively in a direction away from the light-emitting unit, and angles between reflective surfaces of at least two columnar structures in each of the columnar structure groups and the transparent substrate are decreased successively in a direction away from the light-emitting unit.

8. The light homogenizing structure according to claim 1, wherein the plurality of light homogenizing units are a plurality of strip structures extending in a first direction and arranged in a second direction, and one surface of each of the strip structures is arranged on the transparent substrate, and another surface opposite to the surface arranged on the transparent substrate is provided with the reflective surface;

the second direction is perpendicular to the light entry surface of the light homogenizing structure, and the first direction is parallel to the light entry surface of the light homogenizing structure.

9. The light homogenizing structure according to claim 8, wherein heights of the plurality of strip structures are increased successively in a direction away from the light-emitting unit.

10. The light homogenizing structure according to claim 9, wherein angles between reflective surfaces of at least two strip structures and the transparent substrate are decreased successively in a direction away from the light-emitting unit.

11. The light homogenizing structure according to claim 1, wherein a light shading coating is arranged between the transparent substrate and the light homogenizing structure, and an orthographic projection of the light shading coating on the transparent substrate overlaps at least partially with an orthographic projection of the light homogenizing structure on the transparent substrate.

12. The light homogenizing structure according to claim 1, wherein

each of the light homogenizing units is made of a non-transparent material.

13. The light homogenizing structure according to claim 1, wherein the orthographic projection of the one of the light homogenizing units on the display panel is located within a region of the display panel in which a black matrix is disposed.

14. A front light source arranged on a display side of a display panel, comprising:

a light homogenizing structure comprising;

a transparent substrate; and

a plurality of light homogenizing units arranged on a surface of the transparent substrate facing the display panel; and

a light-emitting unit configured to face a light entry surface of the light homogenizing structure, the light entry surface of the light homogenizing structure is a surface of the light homogenizing structure other than a surface facing the display panel and its opposite surface,

wherein a surface of each of the light homogenizing units away from the transparent substrate is a reflective surface tilted relative to the transparent substrate, light rays emitted from the light-emitting unit are incident into the display panel after being reflected on the reflective surface, and an orthographic projection of one of the light homogenizing units on the display panel is located on a border between pixels of the display panel.

15. The front light source according to claim 14, wherein a light-emitting angle of the light-emitting unit is less than a preset angle threshold.

16. The front light source according to claim 14, wherein upper and lower sides of the light-emitting unit are provided with light shading plates which are perpendicular to the light entry surface of the light homogenizing structure.

17. The front light source according to claim 14, wherein the orthographic projection of the one of the light homogenizing units on the display panel is located within a region of the display panel in which a black matrix is disposed.

18. A display device comprising a display panel and a front light source arranged on a display side of the display panel, wherein the front light source comprises:

a light homogenizing structure comprising;

a transparent substrate; and

a plurality of light homogenizing units arranged on a surface of the transparent substrate facing the display panel; and

a light-emitting unit configured to face a light entry surface of the light homogenizing structure, the light entry surface of the light homogenizing structure is a surface of the light homogenizing structure other than a surface facing the display panel and its opposite surface,

wherein a surface of each of the light homogenizing units away from the transparent substrate is a reflective surface tilted relative to the transparent substrate, light rays emitted from the light-emitting unit are incident into the display panel after being reflected on the reflective surface, and an orthographic projection of one of the light homogenizing units on the display panel is located on a border between pixels of the display panel.

19. The display device according to claim 18, wherein the transparent substrate is a protective substrate of the display device.

20. The display device according to claim 18, wherein the orthographic projection of the one of the light homogenizing units on the display panel is located within a region of the display panel in which a black matrix is disposed.