Light guide plate assembly, backlight source and display device

• US 10,690,833 B2
• Filed: 08/29/2018
• Issued: 06/23/2020
• Est. Priority Date: 01/03/2018
• Status: Active Grant

• Current Assignee: BOE Optical Science and Technology Co., Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhang, Qi
• Primary Examiner(s): Bowman, Mary Ellen
• Application Number:
  US16/116,035
• Publication Number:
  US 20190204499A1
• Time in Patent Office: 664 Days
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area

Abstract

The present disclosure provides a light guide plate assembly, a backlight source and a display device. The light guide plate assembly includes at least two light guide plates that are stacked on each other. Refractive indexes of the light guide plates are monotonously changed in a stacking direction of the light guide plates. One side of each light guide plate is provided with a refraction cavity. The refraction cavities of adjacent two light guide plates are disposed in two sides of the light guide plate assembly in a staggered manner. A light scattering layer is disposed at an inner wall that encloses the refraction cavity of each light guide plate.

Claims

1. A light guide plate assembly comprising:

at least two light guide plates that are stacked on each other;

wherein refractive indexes of the light guide plates are gradually reduced in a stacking direction of the light guide plates from a top surface of the light guide plate assembly to a bottom surface of the light guide plate assembly; and

wherein one side of each of the light guide plates is provided with a refraction cavity; and

wherein the refraction cavities of adjacent ones of the light guide plates are disposed in different sides of the light guide plate assembly in a staggered manner; and

wherein a light scattering layer is disposed at an inner wall that encloses the refraction cavity of each of the light guide plates.

2. The light guide plate assembly of claim 1, wherein the refraction cavity of each of the light guide plates is a micro-structured conical cavity.

3. The light guide plate assembly of claim 1, wherein there is a plurality of refraction cavities juxtaposed in one side of each light guide plate.

4. The light guide plate assembly of claim 3, wherein in one side of each light guide plate, the plurality of refraction cavities are juxtaposed in at least two rows.

5. The light guide plate assembly of claim 3, wherein orthographic projections of the cavities of adjacent ones of the light guide plates to the light guide plate assembly do not overlap each other.

6. The light guide plate assembly of claim 1, further comprising a reflective layer filled at a junction of adjacent ones of the light guide plates.

7. The light guide plate assembly of claim 1, wherein the at least two light guide plates comprise a first light guide plate and a second light guide plate, and wherein the first light guide plate is made of a UV curing adhesive layer and the second light guide plate is made of a Silica gel layer, and wherein the second light guide plate is stacked on a bottom surface of the first light guide plate.

8. The light guide plate assembly of claim 7, wherein the at least two light guide plates comprise further comprise a third light guide plate, and wherein the third light guide plate is stacked on a bottom surface of the second light guide plate, and wherein the third light guide plate is made of PC plastic or polymethyl methacrylate.

9. The light guide plate assembly of claim 8, further comprising a microstructural prism layer at a top surface of the first light guide plate.

10. The light guide plate assembly of claim 9, wherein sizes of prisms in the microstructural prism layer are gradually increased from a light incident side of the light guide plate assembly to a light emitting side of the light guide plate assembly.

11. The light guide plate assembly of claim 9, wherein the microstructural prism layer is made of UV curing adhesive.

12. The light guide plate assembly of claim 1, further comprising a microstructural prism layer at a top surface of the light guide plate assembly.

13. The light guide plate assembly of claim 12, wherein sizes of prisms in the microstructural prism layer are gradually increased from a light incident side of the light guide plate assembly to a light emitting side of the light guide plate assembly.

14. The light guide plate assembly of claim 12, wherein the microstructural prism layer is made of UV curing adhesive.

15. A backlight source comprising the light guide plate assembly of claim 1 and a light source disposed at a lateral side of the light guide plate assembly.

16. The backlight source of claim 15, wherein the light source includes at least two light bars, and wherein each of the at least two light bars includes a plurality of LED lights connected in series and matching the light guide plate assembly.

17. A display device comprising:

a backlight source and a display panel;

wherein the backlight source is behind the display panel and the backlight source includes the light guide plate assembly of claim 1.