DIRECT-TYPE BACKLIGHT UNIT FOR FLAT PANEL LIQUID CRYSTAL DISPLAY

• US 20050275766A1
• Filed: 08/13/2003
• Published: 12/15/2005
• Est. Priority Date: 08/16/2002
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yu, Chuan-Pei, Liu, Han-Chou, Hsieh, Chin-Kun
• Granted Patent: US 7,068,332 B2
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A direct-type backlight unit for flat panel liquid crystal display is provided. The direct-type backlight unit includes a plurality of lamps installed within a housing. A reflection plate is installed under the plurality of lamps in the housing. A diffusion film with a plurality of apertures thereon is installed above the plurality of lamps for diffusing light generated by the plurality of lamps. An optic focusing film is located on the diffusion film. The flat panel liquid crystal display is located above the optic focusing film.

Claims

1. A direct-type backlight unit for a flat panel liquid crystal display, comprising:

a plurality of lamps installed within a housing;

a reflection plate installed under the plurality of lamps in the housing; and

a metal diffusion film with a plurality of apertures thereon installed above the plurality of lamps for diffusing light generated by the plurality of lamps.

2. The direct-type backlight unit of claim 1 wherein each of the plurality of lamps is a cold cathode fluorescent lamp (CCFL).

4. The direct-type backlight unit of claim 1 wherein the diffusion film has a thickness of less than 0.5 mm.

5. The direct-type backlight unit of claim 1 further comprises a diffusion sheet located on the metal diffusion film.

6. The direct-type backlight unit of claim 1 wherein at least one heat-dissipating piece is disposed at a periphery of the diffusion film.

7. The direct-type backlight unit of claim 6 wherein the heat-dissipating piece is made of metal.

8. The direct-type backlight unit of claim 6 further comprising a heat exchanging means connected with the heat-dissipating piece.

9. The direct-type backlight unit of claim 8 wherein the heat exchanging means is a heat pipe.

10. The direct-type backlight unit of claim 1 wherein the apertures on the diffusion film have different diameters/dimensions.

11. The direct-type backlight unit of claim 10 wherein the diameter/dimension of the apertures directly above the lamps is smaller than the diameter/dimension of the apertures not directly above the lamps.

12. The direct-type backlight unit of claim 1 wherein the diameters/dimensions of the apertures are the same.

13. The direct-type backlight unit of claim 12 wherein the diffusion film has a highest aperture packing density at an area directly over the lamps.

14. The direct-type backlight unit of claim 1 wherein the apertures are circular or rectangular.

15. The direct-type backlight unit of claim 1 wherein the apertures are columns and rows of through slots arranged on the metal film.

3. (canceled)

16. A direct-type backlight unit for flat panel liquid crystal display, comprising:

a plurality of lamps installed within a housing;

a reflection plate installed under the plurality of lamps in the housing;

a diffusion film with a plurality of apertures thereon installed above the plurality of lamps for diffusing light generated by the plurality of lamps;

a heat-dissipating piece directly connected to the diffusion film; and

a heat exchanging means connected with the heat-dissipating piece.

17. The direct-type backlight unit of claim 16 wherein the diffusion film has a thickness of less than 0.5 mm.

18. The direct-type backlight unit of claim 16 further comprise a diffusion sheet located on the metal diffusion film.

19. The direct-type backlight unit of claim 16 wherein the heat-dissipating piece is made of metal.

20. The direct-type backlight unit of claim 16 wherein the heat exchanging means is a heat pipe.