Direct type backlight module

• US 7,018,059 B2
• Filed: 10/10/2003
• Issued: 03/28/2006
• Est. Priority Date: 07/08/2003
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Liu, Han-Chou, Yu, Chuan-Pei, Kuo, Chien-Hung
• Primary Examiner(s): Cariaso, Alan
• Assistant Examiner(s): Cranson, Jr., James W
• Application Number:
  US10/683,931
• Publication Number:
  US 20050007755A1
• Time in Patent Office: 900 Days
• Field of Search: 362/31, 362/29, 362/629, 362/613, 362/615, 349/112
• US Class Current: 362/29
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

A direct type backlight module. The backlight module includes a reflector, a diffuser plate, lamps, and a light-distributing device. The diffuser plate is disposed on the reflector, and the lamps are disposed between the reflector and the diffuser plate. The light-distributing device is disposed between the lamp and the diffuser plate, and guides light from the lamp to the diffuser plate. A space is defined between the light-distributing device and the diffuser plate.

Claims

1. A direct type backlight module comprising:

a reflector;

a diffuser plate disposed on the reflector;

a lamp disposed between the reflector and the diffuser plate; and

a light-distributing device, comprising a metallic film with a plurality of holes thereon and disposed between the lamp and the diffuser plate, for guiding light from the lamp to the diffuser plate, wherein a space is defined between the light-distributing device and the diffuser plate.

2. The backlight module as claimed in claim 1, wherein the light-distributing device includes a transparent plate and the transparent plate is formed with a plurality of print dots on a surface facing the lamp.

3. The backlight module as claimed in claim 2, wherein each of the print dots is an ink.

4. The backlight module as claimed in claim 1, wherein the light-distributing device includes a transparent plate and the transparent plate is formed with a plurality of print dots on a surface facing the diffuser plate.

5. The backlight module as claimed in claim 4, wherein each of the print dots is an ink.

6. The backlight module as claimed in claim 1, wherein the light-distributing device includes a prism sheet.

7. The backlight module as claimed in claim 6, wherein the prism sheet includes a prism pattern and the prism pattern is formed on a surface facing the lamp, or on a surface facing the diffuser plate, or on both the surface facing the lamp and the surface facing the diffuser plate.

8. The backlight module as claimed in claim 1, wherein the metallic film is composed of aluminum or copper.

9. The backlight module as claimed in claim 1, further comprising a prism sheet disposed on the diffuser plate.

10. A direct type backlight module comprising:

a reflector;

a diffuser plate disposed on the reflector;

a lamp disposed between the reflector and the diffuser plate; and

a light-distributing device, comprising a light guide plate with a plurality of indexes of refraction thereon and disposed between the lamp and the diffuser plate, for guiding light from the lamp to the diffuser plate, wherein a space is defined between the light-distributing device and the diffuser plate;

wherein the indexes of refraction are increased from a center of the light guide plate to a periphery of the light guide plate.

11. The backlight module as claimed in claim 10, wherein the light-distributing device includes a transparent plate and the transparent plate is formed with a plurality of print dots on a surface facing the lamp.

12. The backlight module as claimed in claim 11, wherein each of the print dots is an ink.

13. The backlight module as claimed in claim 10, wherein the light-distributing device includes a transparent plate and the transparent plate is formed with a plurality of print dots on a surface facing the diffuser plate.

14. The backlight module as claimed in claim 13, wherein each of the print dots is an ink.

15. The backlight module as claimed in claim 10, wherein the light-distributing device includes a prism sheet.

16. The backlight module as claimed in claim 15, wherein the prism sheet includes a prism pattern and the prism pattern is formed on a surface facing the lamp, or on a surface facing the diffuser plate, or on both the surface facing the lamp and the surface facing the diffuser plate.