Backlight device

• US 20070121320A1
• Filed: 08/15/2005
• Published: 05/31/2007
• Est. Priority Date: 08/18/2004
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Oku, Takashi, Arai, Takeo
• Granted Patent: US 7,510,314 B2
• Time in Patent Office: Days
• US Class Current: 362/247
• CPC Class Codes: G02F 1/133603 with LEDs

Abstract

The present invention is directed to a backlight device using light emitting units (7) in which a large number of light emitting diodes (12) are mounted, which comprises a reflection plate (16) for reflecting rays of light which have been emitted from a light emitting unit (11), wherein the reflection plate (16) is composed of a bottom surface reflection plate (16a) for reflecting rays of light emitted from the light emitting units (7) from the bottom surface direction, side surface reflection plates (16b) to (16e) for reflecting rays of light emitted from the light emitting units (7) from respective forward and backward, and left and right side surface directions, and corner reflection plates (16f) to (16i) in which the bottom surface reflection plate (16a) and the side surface reflection plates (16b) to (16e) are connected to cover the respective corner portions, and serves to permit rays of light incident onto a display panel (1) to be uniform to realize uniformity of brightness of the entire surface thereof.

Claims

1. A backlight device comprised of a light source unit in which a large number of light emitting diodes are mounted,

the backlight device comprising:

a reflection plate for reflecting rays of light emitted from the light source unit,

wherein the reflection plate is composed of a bottom surface reflection plate for reflecting, from the bottom surface direction, rays of light emitted from the light source unit, side face reflection plates for reflecting rays of light emitted from the light source unit from respective forward and backward, and left and right side surface directions, and corner reflection plates for covering respective corner portions where the bottom surface reflection plate and the side surface reflection plates are connected.

2. The backlight device as set forth in claim 1,

wherein reflection surface of the corner reflection plate takes polygonal shape.

3. The backlight device as set forth in claim 1,

wherein reflection surface of the corner reflection plate take flat plate shape.

4. The backlight device as set forth in claim 1,

wherein reflection surface of the corner reflection plate takes spherical shape.