Light guide plate, backlight module and display device

Patent metadata

Field	Value
Publication number	US-11320574-B2
Application number	US-201816332263-A
Country	US
Kind code	B2
Filing date	Sep 14, 2018
Priority date	Sep 19, 2017
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A light guide plate, a backlight module and a display device are provided. A plurality of blind holes is arranged at a surface of the light guide plate; the blind hole is filled with a light-converting unit; the light-converting unit includes an accommodating cavity made of a light-transmitting material, and a light-converting material located in the accommodating cavity; and a gap is between an outer wall of the accommodating cavity and an inner wall of the blind hole.

First claim

What is claimed is:

1. A light guide plate, comprising: a light-entering surface, a light-exiting surface opposite to the light-entering surface, a plurality of blind holes arranged at the light-exiting surface of the light guide plate, and a light-converting unit arranged in each of the plurality of blind holes,
wherein the light-converting unit comprises a container made of a light-transmitting material, and a light-converting material located in the container, and an air gap is between an outer wall of the container and an inner wall of each of the blind holes,
wherein each of the blind holes is cylinder-like, and the outer wall of the container is an inclined surface.

2. The light guide plate according to claim 1 , wherein the light-converting material comprises at least one of a quantum dot material and a fluorescent material.

3. The light guide plate according to claim 1 , wherein a diameter of each blind hole is in a range of 100 μm to 1000 μm, a depth of each blind hole is in a range of 100 μm to 1000 μm, and a diameter of the accommodating container is smaller than 100 μm.

4. The light guide plate according to claim 1 , wherein the light-transmitting material comprises a glass or a transparent resin.

5. The light guide plate according to claim 1 , wherein the accommodating container is truncated cone-like.

6. The light guide plate according to claim 1 , wherein a refractive index of a medium filled into the gap is less than a refractive index of the light-converting material.

7. The light guide plate according to claim 1 , wherein the first surface is a light-exiting surface or a light-entering surface of the light guide plate.

8. A backlight module, comprising:
a light guide plate, wherein the light guide plate comprises: a light-entering surface, a light-exiting surface opposite to the light-entering surface, a plurality of blind holes arranged at the light-exiting surface of the light guide plate, and a light-converting unit arranged in each of the plurality of blind holes, the light-converting unit comprises a container made of a light-transmitting material, and a light-converting material located in the container, and an air gap is between an outer wall of the container and an inner wall of each of the blind holes; and
a light source arranged on a side of the light-entering surface of the light guide plate and configured to excite the light-converting material to emit light;
wherein each of the blind holes is cylinder-like, and the outer wall of the container is an inclined surface.

9. The backlight module according to claim 8 , wherein the light source comprises a LED (Light Emitting Diode) array, and each LED in the LED array corresponds to at least one light-converting unit.

10. The backlight module according to claim 9 , wherein the LED array is arranged on a transparent substrate, and a light reflecting layer is arranged on a side of the transparent substrate facing away from the LED array.

11. The backlight module according to claim 10 , wherein each LED in the LED array is a blue LED.

12. The backlight module according to claim 8 , further comprising:
a light-shielding metal pattern located on the first surface of the light guide plate, wherein an orthographic projection of the light-shielding metal pattern onto the first surface overlaps with an orthographic projection of the light-converting unit onto the first surface.

13. The backlight module according to claim 12 , further comprising at least one of a scattering film and a brightness enhancement film,
wherein the scattering film and the brightness enhancement film are both located on a side of the light-shielding metal pattern facing away from the first surface of the light guide plate.

14. The backlight module according to claim 8 , wherein the light-converting material comprises at least one of a quantum dot material and a fluorescent material.

15. The backlight module according to claim 8 , wherein a diameter of each blind hole is in a range of 100 μm to 1000 μm, a depth of each blind hole is in a range of 100 μm to 1000 μm, and a diameter of the accommodating container is smaller than 100 μm.

16. The backlight module according to claim 8 , wherein the light-transmitting material comprises a glass or a transparent resin;
the accommodating container is truncated cone-like;
a refractive index of a medium filled into the gap is less than a refractive index of the light-converting material.

17. A display device, comprising the backlight module according to claim 8 .

Assignees

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

Inventors

• Qi Yonglian
• Dong Xue
• Wang Huijuan
• Yang Zezhou
• Zhao Hebin
• Qu Lianjie
• Liu Shuai

Classifications

• G02F1/133614

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

• G02B6/0003 Primary

  the light guides being doped with fluorescent agents · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02B6/0068

  Arrangements of plural sources, e.g. multi-colour light sources · CPC title