Backlight module and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9645298-B2
Application number	US-201414317593-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Mar 31, 2014
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

Embodiments of the present invention provide a backlight module and a liquid crystal display device. The backlight module comprises a light bar, a light guide plate and a reflector sheet. The light guide plate and the reflector sheet are adhered to each other. An anti-reflection structure is provided on at least one side of the light guide plate and/or the reflector sheet. The anti-reflection structure is used for reducing light reflected by the reflector sheet which is emitted from the light sources. The anti-reflection structure includes anti-reflection structures. A first anti-reflection structure is located on one side of the light guide plate and/or the reflector sheet close to the light bar, while a second anti-reflection structure is located on other sides of the light guide plate and/or the reflector sheet. The present invention may improve the luminescence uniformity of the backlight module.

First claim

The invention claimed is:

1. A backlight module, comprising a light bar, a light guide plate and a reflector sheet, the light guide plate and the reflector sheet being adhered to each other, the light bar being located on one side of the light guide plate and comprising a plurality of light sources arranged at intervals, wherein,
an anti-reflection structure is provided on at least one side of the light guide plate and/or the reflector sheet and used for reducing light reflected by the reflector sheet which is emitted from the light sources;
the anti-reflection structure comprises a first anti-reflection structure and/or a second anti-reflection structure, the first anti-reflection structure being located on a first side of the light guide plate and/or the reflector sheet close to the light bar, while the second anti-reflection structure being located on at least one side other than the first side of the light guide plate and/or the reflector sheet,
wherein the first anti-reflection structure corresponds in shape to the primary reflective region of the reflector sheet onto which the light sources irradiate.

2. The backlight module according to claim 1 , wherein,
the first anti-reflection structure comprises a plurality of first hollow regions located on one side of the reflector sheet close to the light bar, and the first hollow regions are in one-to-one correspondence with the positions of the light sources.

3. The backlight module according to claim 2 , wherein the first hollow regions are circular, elliptic or rectangular in shape; and
the area of the primary reflective region of the reflector sheet onto which the light sources irradiate is less than or equal to the area of the first hollow region.

4. The backlight module according to claim 1 , wherein,
the second anti-reflection structure comprises second hollow regions located on edges of the reflector sheet corresponding to two sides of the light bar and/or located on an edge on one side of the reflector sheet away from the light bar.

5. The backlight module according to claim 1 , wherein the light guide plate further comprises a dot-pattern layer disposed close to a surface on one side of the reflector sheet; and
a plurality of transmission-prevention regions are provided on the dot-pattern layer.

6. The backlight module according to claim 5 , wherein,
a plurality of first transmission-prevention regions are provided on one side of the dot-pattern layer close to the light bar, and the first transmission-prevention regions are in one-to-one correspondence with the positions of the light sources; and
in the dot-pattern layer, the dot-pattern density of the first transmission-prevention regions is less than that of the dot-pattern layer other than the transmission-prevention regions.

7. The backlight module according to claim 5 , wherein,
a plurality of second transmission-prevention regions are provided on edges of the dot-pattern layer corresponding to two sides of the light bar and/or an edge on one side of the dot-pattern layer away from the light bar; and
in the dot-pattern layer, the dot-pattern density of the second transmission-prevention regions is less than that of the dot-pattern layer other than the transmission-prevention regions.

8. The backlight module according to claim 7 , wherein,
in the second transmission-prevention regions, the dot-pattern density on one side close to the light bar is less than that on the side away from the light bar.

9. The backlight module according to claim 1 , wherein the light sources include LED.

10. A liquid crystal display device, comprising the backlight module according to claim 1 .

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Vision-Electronic Tech Co Ltd

Inventors

• Fu Changjia

Classifications

• G02B6/002

  by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces · CPC title

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title