Backlight assembly and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9223082-B2
Application number	US-201313945100-A
Country	US
Kind code	B2
Filing date	Jul 18, 2013
Priority date	Sep 28, 2012
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

Embodiments of the present invention disclose a backlight assembly and a liquid crystal display device, and the backlight assembly comprises: a light guide plate; a base plate, disposed on an opposite side of a light emitting side of the light guide plate; and a back plate, disposed on a side of the light guide plate along an edge of the base plate, wherein an edge-type light source is disposed on a side facing the light guide plate of the back plate, the back plate is pivotally connected with the base plate via a rotation axis, and the back plate rotates about the rotation axis.

First claim

The invention claimed is:

1. A backlight assembly, comprising:
a light guide plate;
a base plate, disposed on an opposite side of a light emitting side of the light guide plate; and
a back plate, disposed on a side of the light guide plate along an edge of the base plate,
wherein an edge-type light source is disposed on a side facing the light guide plate of the back plate, the back plate is pivotally connected with the base plate via a rotation axis, and the back plate is rotatable about the rotation axis to vary backlight effect of the backlight assembly,
wherein the base plate, the back plate and the rotation axis are separated from each other,
wherein the rotation axis is positioned between one side surface of the back plate which is adjacent to the side where the edge-type light source is disposed and one side surface of the base plate, and the one side surface of the back plate and the one side surface of the base plate is rotatable about the rotation axis.

2. The backlight assembly according to claim 1 , wherein an angle formed between the back plate and a normal direction of the light guide plate is not larger than a divergence angle of emitting light of the edge-type light source.

3. The backlight assembly according to claim 1 , wherein a side surface facing the edge-type light source of the light guide plate is a concave surface.

4. The backlight assembly according to claim 3 , wherein a concave space formed by the concave surface of the light guide plate is larger than a space required by the rotation of the edge-type light source.

5. The backlight assembly according to claim 1 , wherein the edge-type light source is a light emitting diode.

6. The backlight assembly according to claim 1 , further comprising: a control module for controlling the rotation of the rotation axis.

7. The backlight assembly according to claim 1 , further comprising: a reflection film layer, disposed on a side opposite to a light emitting side of the light guide plate, located between the light guide plate and the base plate, and for reflecting light emitting from the edge-type light source.

8. The backlight assembly according to claim 1 , further comprising: an optical film layer, disposed on a light emitting surface of the light guide plate to converge light emitted from the light emitting surface of the light guide plate.

9. The backlight assembly according to claim 1 , further comprising: a frame, disposed outside the base plate and the back plate to fix and protect the internal structure of the backlight assembly.

10. A liquid crystal display device, comprising:
the backlight assembly according to claim 1 ; and
a liquid crystal panel, which is located on a light emitting side of the backlight assembly.

11. The liquid crystal display device according to claim 10 , wherein the liquid crystal panel comprises:
an array substrate;
an opposite substrate, disposed to face the array substrate to form a liquid crystal cell; and
a liquid crystal material, filled in the liquid crystal cell.

Assignees

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

Inventors

• Chi Hai
• Yoon Daekeun

Classifications

• G02B6/0013 Primary

  Means for improving the coupling-in of light from the light source into the light guide (coupling light into light guides in general G02B6/42) · CPC title

• G02B6/0088 Primary

  of the light guide or other optical sheets in the package · CPC title

• G02F1/133615 Primary

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

• G02B6/0035

  provided on the surface of the light guide or in the bulk of it · CPC title

• G02B6/0091

  of the light source relative to the light guide (G02B6/0021 takes precedence) · CPC title