Backlight assembly and display device

Patent metadata

Field	Value
Publication number	US-11796155-B2
Application number	US-202117765071-A
Country	US
Kind code	B2
Filing date	May 20, 2021
Priority date	Jun 29, 2020
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

There are provided a backlight assembly (1) and a display device, the backlight assembly (1) includes a light source substrate (10), a microstructure film layer (30) and a backlight film material layer (20); the backlight film material layer (20) is located on a light outgoing side of the light source substrate (10), the microstructure film layer (30) is provided between the light source substrate (10) and the backlight film material layer (20), the microstructure film layer (30) includes a light transmission layer (301) and a microstructure region (302); the microstructure region (302) is provided at an edge position of the microstructure film layer (30).

First claim

What is claimed is:

1. A backlight assembly, comprising:
a light source substrate, a microstructure film layer and a backlight film material layer;
wherein the backlight film material layer is located on a light outgoing side of the light source substrate, and contains red quantum dots and green quantum dots;
the microstructure film layer is provided between the light source substrate and the backlight film material layer, and comprises a light transmission layer and a microstructure region; the microstructure region is provided at an edge position of the microstructure film layer; the microstructure film layer is configured to change, at the edge position, an outgoing angle of all or part of backlight passing through the microstructure region, so that all or part of the backlight passing through the microstructure region is deflected from a direction perpendicular to an edge where the microstructure region is located and is refracted away from a center of the microstructure film layer.

2. The backlight assembly of claim 1 , wherein the light source substrate is a direct-type light source substrate.

3. The backlight assembly of claim 2 , wherein the direct-type light source substrate comprises a circuit substrate and blue light chips provided at intervals on the circuit substrate; orthographic projections of the blue light chips on a plane where the circuit substrate is located are all located within an orthographic projection of the microstructure film layer on the plane where the circuit substrate is located.

4. The backlight assembly of claim 3 , wherein a cross section of the microstructure region in a direction perpendicular to an edge of the microstructure film layer comprises at least one right triangle; wherein a first leg of the right triangle is located on the light transmission layer, and a second leg of the right triangle is provided at a position away from the center of the microstructure film layer in the direction perpendicular to the edge where the microstructure region is located.

5. The backlight assembly of claim 4 , wherein the at least one right triangle comprises two or more right triangles, and the right triangles are provided in contact with each other.

6. The backlight assembly of claim 4 , wherein the at least one right triangle comprises two or more right triangles, and the right triangles are provided at equal intervals,
or, intervals between the right triangles are gradually increased in a direction from the edge to the center of the microstructure film layer.

7. The backlight assembly of claim 3 , wherein a cross section of the microstructure region in a direction perpendicular to the edge of the microstructure film layer comprises at least one right trapezoid; wherein a longer base side of the right trapezoid is located on the light transmission layer, and a vertical waist side of the right trapezoid is provided at a position away from the center of the microstructure film layer in the direction perpendicular to the edge where the microstructure region is located.

8. The backlight assembly of claim 7 , wherein the at least one right trapezoid comprises two or more right trapezoids, and the right trapezoids are provided in contact with each other; wherein shorter base sides of the right trapezoids have a same length.

9. The backlight assembly of claim 7 , wherein the at least one right trapezoid comprises two or more right trapezoids, and the right trapezoids are provided in contact with each other; wherein lengths of shorter base sides of the right trapezoids are gradually increased in a direction from the edge to the center of the microstructure film layer.

10. The backlight assembly of claim 1 , wherein the backlight film material layer comprises a red-and-green light reflection film layer and a quantum dot layer provided in sequence in a light outgoing direction; wherein, the quantum dot layer comprises red quantum dots and green quantum dots; the red-and-green light reflection film layer is configured to reflect red light and green light.

11. The backlight assembly of claim 1 , wherein the red-and-green light reflection film layer also serves as the light transmission layer.

12. The backlight assembly of claim 1 , wherein a material of the microstructure region includes ultraviolet photosensitive resin, and/or a material of the light transmission region includes polyethylene terephthalate.

13. A display device, comprising the backlight assembly of claim 1 .

14. The backlight assembly of claim 2 , wherein the backlight film material layer comprises a red-and-green light reflection film layer and a quantum dot layer provided in sequence in a light outgoing direction; wherein, the quantum dot layer comprises red quantum dots and green quantum dots; the red-and-green light reflection film layer is configured to reflect red light and green light.

15. The backlight assembly of claim 3 , wherein the backlight film material layer comprises a red-and-green light reflection film layer and a quantum dot layer provided in sequence in a light outgoing direction; wherein, the quantum dot layer comprises red quantum dots and green quantum dots; the red-and-green light reflection film layer is configured to reflect red light and green light.

16. The backlight assembly of claim 4 , wherein the backlight film material layer comprises a red-and-green light reflection film layer and a quantum dot layer provided in sequence in a light outgoing direction; wherein, the quantum dot layer comprises red quantum dots and green quantum dots; the red-and-green light reflection film layer is configured to reflect red light and green light.

17. The backlight assembly of claim 2 , wherein the red-and-green light reflection film layer also serves as the light transmission layer.

18. The backlight assembly of claim 3 , wherein the red-and-green light reflection film layer also serves as the light transmission layer.

19. The backlight assembly of claim 4 , wherein the red-and-green light reflection film layer also serves as the light transmission layer.

20. The backlight assembly of claim 2 , wherein a material of the microstructure region includes ultraviolet photosensitive resin, and/or a material of the light transmission region includes polyethylene terephthalate.

Assignees

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

Inventors

• Yao Jianfeng
• Wang Qiuli
• Chen Lei
• Wang Zhiqiang
• Ma Xin
• Sun Chuan
• Wang Xinyu
• Tan Dingyang

Classifications

• F21V9/30 Primary

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title

• G02F1/133607

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title

• G02F1/133614 Primary

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title

• F21Y2113/10

  of different colours · CPC title

• G09F9/00 Primary

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title