Light guide plate assembly, backlight module, and display device

Patent metadata

Field	Value
Publication number	US-11953784-B2
Application number	US-202318306448-A
Country	US
Kind code	B2
Filing date	Apr 25, 2023
Priority date	Feb 10, 2023
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A light guide plate assembly, a backlight module, and a display device are provided. The light guide plate assembly is configured to guide exiting light emitted from a light-emitting element. The light guide plate assembly includes a reflective part includes an opening, and a transmissive part. At least a part of the transmissive part is located at a side of the reflective part adjacent to a light-exiting side of the light guide plate assembly. The transmissive part includes a first part. Along a direction from a center of the opening to an edge of the opening, light intensity of the exiting light received by the first part is negatively correlated to light transmittance of the first part.

First claim

What is claimed is:

1. A light guide plate assembly configured to guide exiting light emitted from a light-emitting element, the light guide plate assembly comprising:
a reflective part comprising an opening; and
a transmissive part, wherein at least a part of the transmissive part is located at a side of the reflective part adjacent to a light-exiting side of the light guide plate assembly, and the transmissive part comprises a first part and a second part, wherein, along a direction from a center of the opening to an edge of the opening, light intensity of the exiting light received by the first part is negatively correlated to light transmittance of the first part,
wherein the reflective part is directly beneath the second part.

2. The light guide plate assembly according to claim 1 , wherein, along the direction from the center of the opening to the edge of the opening, the light intensity of the exiting light received by the first part decreases, and the light transmittance of the first part increases.

3. The light guide plate assembly according to claim 2 , wherein the transmissive part comprises a body and diffusion particles dispersed in the body, wherein at least some of the diffusion particles are above the center of the opening along a thickness direction of the light guide plate assembly.

4. The light guide plate assembly according to claim 3 , wherein the diffusion particles are evenly distributed in the body, and the body has a thickness decreasing along the direction from the center of the opening to the edge of the opening.

5. The light guide plate assembly according to claim 4 , wherein the light transmittance Y of the first part and the thickness X of the body satisfy:
Y=− 0.0143 X 3 +0.1157 X 2 −0.377 X+ 0.9157.

6. The light guide plate assembly according to claim 4 , wherein a light diffusion degree D of the first part of the body satisfies: D≥50, and a melting index M of the body satisfies: M≥30 cm 3 /10 min.

7. The light guide plate assembly according to claim 1 , wherein the first part has a thickness decreasing along the direction from the center of the opening to the edge of the opening.

8. The light guide plate assembly according to claim 7 , wherein the transmissive part comprises a first surface located at a side of the transmissive part adjacent to the light-exiting side of the light guide plate assembly, and wherein the first surface is parallel to a plane of the light guide plate assembly.

9. The light guide plate assembly according to claim 8 , wherein the transmissive part further comprises a second surface located at a side of the transmissive part adjacent to a light-entering side of the light guide plate assembly, and wherein the second surface comprises a first sub-surface corresponding to the center of the opening along a thickness direction of the light guide plate assembly and parallel to the plane of the light guide plate assembly.

10. The light guide plate assembly according to claim 9 , wherein the second surface further comprises a second sub-surface and a third sub-surface, wherein the second sub-surface and the center of the opening are staggered from each other along a thickness direction of the light guide plate assembly, and the third sub-surface connects the first sub-surface and the second sub-surface and comprises a curved surface.

11. The light guide plate assembly according to claim 1 , wherein the second part is located at the side of the reflective part adjacent to the light-exiting side of the light-exiting side of the light guide plate assembly at least partially surrounds the first part, wherein the second part and the opening are staggered from each other along a direction perpendicular to a plane of the light guide plate assembly, and wherein a thickness of the second part along the direction perpendicular to the plane of the light guide plate assembly is greater than a minimum thickness of the first part along the direction perpendicular to the plane of the light guide plate assembly.

12. The light guide plate assembly according to claim 1 , wherein the second part comprises a fourth sub-surface adjacent to the opening, and the transmissive part comprises a second surface located at a side of the transmissive part adjacent to a light-entering side of the light guide plate assembly, wherein the second surface comprises a second sub-surface and a fifth sub-surface, wherein a center of the second sub-surface and the center of the opening are staggered along a thickness direction of the light guide plate assembly, and the fifth sub-surface connects the second sub-surface and the fourth sub-surface and comprises a curved surface.

13. The light guide plate assembly according to claim 1 , wherein the reflective part has a same width along a direction from a light-entering side of the light guide plate assembly to the light-exiting side of the light guide plate assembly, or has a width increasing along the direction from the light-entering side of the light guide plate assembly to the light-exiting side of the light guide plate assembly, wherein a width direction of the reflective part is parallel to a plane of the light guide plate assembly.

14. The light guide plate assembly according to claim 1 , wherein a thickness A of the light guide plate assembly and a thickness C of the reflective part satisfy: 0.7 mm≤C≤2A/3.

15. The light guide plate assembly according to claim 1 , wherein the reflective part comprises a plurality of reflective parts comprising: a first reflective part, a second reflective part, and a third reflective part that are arranged in a plane of the light guide plate assembly and along a direction from an edge of the light guide plate assembly to a center of the light guide plate assembly, wherein the first reflective part has a thickness greater than or equal to a thickness of the third reflective part, and the thickness of the third reflective part is greater than or equal to a thickness of the second reflective part.

16. The light guide plate assembly according to claim 1 , wherein the reflective part comprises a first part and a second part that are connected to each other, wherein a distance between the second part and the center of the opening is greater than a distance between the first part and the center of the opening, and
wherein the first part has a width greater than or equal to a width of the second part.

17. The light guide plate assembly according to claim 1 , wherein the reflective part comprises a first part and a second part that are connected to each other, wherein a distance between the second part and the center of the opening is greater than a distance between the first part and the center of the opening, and
wherein the first part has a thickness greater than or equal to a thickness of the second part.

18. A backlight module, comprising:
a light-emitting element; and
a light guide plate assembly located at a light-exiting side of the light-emitting element and configured to guide light emitted from the light-emitting element,
wherein the light guide plate assembly comprises:
a reflective part comprising an opening; and
a transmissive part, wherein at least a part of the transmissive part is located at a side of the reflective part adjacent to a light-exiting side of the light guide plate assembly, and the transmissive part comprises a first part and a second part, wherein along a direction from a center of the opening to an edge of the opening, light intensity of the exiting light received by the first part is negatively correlated to light transmittance o

Assignees

• Shanghai Tianma Micro Elect Co

Inventors

• Guo Zhanxiang
• Xu Yumin
• Bian Jianguo
• Ren Jiantao
• Chang Binbin
• Gao Zhaoxing
• Sun Weiyang
• Wang Wanzhen

Classifications

• G02F1/133611 Primary

  including means for improving the brightness uniformity · CPC title

• G02B6/0021

  for housing at least a part of the light source, e.g. by forming holes or recesses · CPC title

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0041

  provided in the bulk of the light guide · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title