Direct type backlight device for liquid crystal module

• US 20070047225A1
• Filed: 08/02/2006
• Published: 03/01/2007
• Est. Priority Date: 08/30/2005
• Status: Abandoned Application

• Current Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Original Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Inventors: Sudo, Tatsuji
• Application Number:
  US11/497,287
• Publication Number:
  US 20070047225A1
• Time in Patent Office: Days
• US Class Current: 362/225
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means

Abstract

A direct type backlight device for a liquid crystal module having a liquid crystal panel includes a resin molded frame, a reflective sheet, a light diffuser plate and at least one crosspiece. The resin molded frame attaches linear light sources in parallel at a plurality of sites spaced apart. The reflective sheet is disposed on one side of the frame. The light diffuser plate is disposed on another side of the frame. The crosspiece is fixed to the frame between adjacent linear light sources and has a light reflecting surface. Light transmitted through the light diffuser plate illuminates the liquid crystal panel.

Claims

1. A direct type backlight device for a liquid crystal module having a liquid crystal panel, comprising:

a resin molded frame configured to attach a plurality of linear light sources in parallel at a plurality of sites spaced apart;

a reflective sheet disposed on one side of the frame;

a light diffuser plate disposed on another side of the frame, the light diffuser plate being configured to illuminate the liquid crystal panel when light is transmitted there through; and

at least one crosspiece fixed to the frame between adjacent linear light sources, and having a light reflecting surface.

2. The direct type backlight device for a liquid crystal module according to claim 1, wherein

the crosspiece is integrally molded with the frame.

3. The direct type backlight device for a liquid crystal module according to claim 1, wherein

the crosspiece has a peaked cross sectional shape with a peak, and a surface of the peak of the crosspiece is the light reflecting surface.

4. The direct type backlight device for a liquid crystal module according to claim 1, wherein

the frame is rectangular, and the linear light sources and the crosspiece extend in a longitudinal direction of the rectangular frame.

5. The direct type backlight device for a liquid crystal module according to claim 4, wherein

a plurality of protrusions that protrude toward the light diffuser plate are spaced apart in a row along the crosspiece, and a top of each of the protrusions is proximal to and across from the light diffuser plate.

6. The direct type backlight device for a liquid crystal module according to claim 5, wherein

when the light diffuser plate is bent from its original position so as to bulge toward the inside of the frame, the tops of the protrusions hit a bulging region of the light diffuser plate so that a bending deflection amount of the light diffuser plate is restricted.

7. The direct type backlight device for a liquid crystal module according to claim 1, wherein

the reflective sheet is linked to the crosspiece where the reflective sheet overlaps the crosspiece.

8. The direct type backlight device for a liquid crystal module according to claim 1, wherein

a plurality of the crosspieces are fixed to the frame in the middle of the adjacent linear light sources,

the plurality of the crosspieces each have a peaked cross sectional shape with a peak, and a surface of the peak is the light reflecting surface,

the frame is rectangular,

the linear light sources and the crosspieces extend in a longitudinal direction of the frame,

a plurality of protrusions that protrude toward the light diffuser plate are spaced apart in a row along the crosspieces,

a top of each of the protrusions is proximal to and across from the light diffuser plate, and

when the light diffuser plate is bent from its original position so as to bulge toward the inside of the frame, the tops of the protrusions hit a bulging region of the light diffuser plate so that a bending deflection amount of the light diffuser plate is restricted.

9. The direct type backlight device for a liquid crystal module according to claim 1, wherein

a plurality of the crosspieces are fixed to the frame in the middle of the adjacent linear light sources,

the plurality of the crosspieces each have a peaked cross sectional shape with a peak, and a surface of the peak is the light reflecting surface,

the frame is rectangular,

the linear light sources and the crosspieces extend in a longitudinal direction of the frame,

a top of each of the crosspieces is spaced apart from the light diffuser plate, and

the reflective sheet is linked to the crosspieces where the reflective sheet overlaps the crosspieces.