Backlight unit and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9557600-B2
Application number	US-201113643419-A
Country	US
Kind code	B2
Filing date	Mar 31, 2011
Priority date	Apr 28, 2010
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A backlight unit includes excellent heat radiation characteristics. The backlight unit of an embodiment of the present invention includes a chassis and a light source attached to the chassis. As the light source, an LED is preferably used. The chassis includes an aluminum base or aluminum layer, and a porous alumina layer or pore-sealed porous alumina layer provided on the surface of the aluminum base or aluminum layer.

First claim

The invention claimed is:

1. A backlight unit, comprising:
a chassis; and
a light source attached to the chassis,
wherein the chassis includes an aluminum base or aluminum layer, and a porous alumina layer or pore-sealed porous alumina layer provided on the aluminum base or aluminum layer, and
wherein the porous alumina layer or pore-sealed porous alumina layer comprises a first region, extending from the aluminum base or aluminum layer to a top most surface of the porous alumina layer or pore-sealed porous alumina layer having a micropore formed therein, of a first thickness and a second region, extending from the aluminum base or aluminum layer to a top most surface of the porous alumina layer or pore-sealed porous alumina layer having a micropore formed therein, of a second thickness which is different from the first thickness.

2. The backlight unit of claim 1 , further comprising a light source control circuit for controlling the light source.

3. The backlight unit of claim 2 , wherein
the chassis has a front surface and a rear surface,
the light source is provided on the front surface of the chassis, and
the light source control circuit is provided on the rear surface of the chassis.

4. The backlight unit of claim 2 , wherein
the chassis has an opening, and
the backlight unit further comprises a connection portion in the opening for electrically coupling the light source control circuit and the light source.

5. The backlight unit of claim 1 , wherein the light source includes a light-emitting diode.

6. The backlight unit of claim 1 , further comprising at least one of an air supply fan and a heat exhaust fan.

7. The backlight unit of claim 6 , wherein the air supply fan is attached generally parallel to a direction normal to the rear surface of the chassis.

8. The backlight unit of claim 6 , wherein the heat exhaust fan is attached generally perpendicular to a direction normal to the rear surface of the chassis.

9. A liquid crystal display device, comprising:
a liquid crystal panel; and
the backlight unit as set forth in claim 1 for emitting light to the liquid crystal panel.

10. The backlight unit of claim 1 , wherein the porous alumina layer or the pore-sealed porous alumina layer is an anodic porous alumina layer.

11. The backlight unit of claim 1 , wherein the porous alumina layer or the pore-sealed porous alumina layer is formed by anodizing a surface of the aluminum base or aluminum layer.

12. The backlight unit of claim 1 , the first thickness and the second thickness are at least 6 μm.

Assignees

• Imaoku Takao
• Yoshioka Takatomo
• Fujiwara Kohji
• Sharp Kk

Inventors

• Imaoku Takao
• Yoshioka Takatomo
• Fujiwara Kohji

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• H01M4/0442

  Anodisation, Oxidation (electrolytic coating by anodisation C25D9/00) · CPC title

• G02F2001/133628

  Physics · mapped topic

• G02F2001/133314

  Physics · mapped topic

• G02F1/133628

  with cooling means · CPC title