Back light module of liquid crystal display device

• US 20050180171A1
• Filed: 04/28/2004
• Published: 08/18/2005
• Est. Priority Date: 02/18/2004
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chu, Chun-Chich, Huang, Hsin-Tao
• Granted Patent: US 7,207,707 B2
• Time in Patent Office: Days
• US Class Current: 362/633
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/1336 Illuminating devices

Abstract

The back light module of LCD device of the present invention is to use the two ends of reflecting plate to roll up and cover light generating units and reaching the function of lamp reflector. Also, the problem of EMI (electric magnetic interference) can be overcome by covering a shell with an EMI protection function on the roll up ends and/or coating or covering the metal with an EMI protection function on one surface of the reflecting plate.

Claims

1. A back light module of LCD device, comprising:

a support frame having support elements thereon;

at least one light generating unit having two coupling elements to engage with said support elements respectively installed on two ends of at least one said light generating unit;

a light reflecting plate installed on said support frame for reflecting a light generated by at least one said light generating unit upwards, and two ends of said reflecting plate bent upward; and

a light guiding plate installed on said reflecting plate for guiding light;

wherein a metallic material for isolating electromagnetic interference is installed on a surface of said reflecting plate, a surface of said coupling elements, or the combination thereof.

2. The back light module according to claim 1, wherein material of said coupling elements is silica gel.

3. The back light module according to claim 1, wherein said metallic material for isolating electromagnetic interference is Cu, Ni, Al, or the combination thereof.

4. The back light module according to claim 1, wherein said reflecting plate is divided into two portions for covering said light generating unit.

5. The back light module according to claim 4, wherein said reflecting plate is composed of an upper cover and a bottom reflecting plate.

6. The back light module according to claim 5, wherein said upper cover is L-shaped.

7. The back light module according to claim 5, wherein said bottom reflecting plate has two ends bent upward.

8. A back light module of LCD device, comprising:

a support frame;

a light reflecting plate installed on said support frame, and two ends of said reflecting plate bent upward;

a light guiding plate installed on said reflecting plate, two side of said light guiding plate respectively having an indentation, and support elements are formed in said indentations;

at least one light generating unit installed in corresponding indentation, said light reflecting plate reflecting light generated by at least one said light generating unit upwards, said light guiding plate for guiding light, and at least one said light generating unit having two coupling elements to engage with said support elements respectively installed on two ends thereof;

wherein a metallic material for isolating electromagnetic interference is installed on a surface of said reflecting plate, a surface of said coupling elements, or the combination thereof.

9. The back light module of LCD penal according to claim 8, wherein material of said coupling elements are silica gel.

10. The back light module according to claim 8, wherein said metallic material is Cu, Ni, Al, or the combination thereof.

11. The back light module according to claim 8, wherein said reflecting plate is composed of an upper cover and a bottom reflecting plate.

12. The back light module according to claim 11, wherein said bottom reflecting plate has two ends bent upward.

13. The back light module according to claim 11, wherein said upper cover is L-shaped.

14. A back light module of LCD device, comprising:

a support frame;

at least one light generating unit having two coupling elements respectively installed on two ends of at least one said light generating unit;

a light reflecting plate installed between at least one said light generating unit and said support frame for reflecting a light generated by at least one said light generating unit upwards, and two ends of said reflecting plate bent upward; and

a light guiding plate installed on said reflecting plate for guiding light, and said light guiding plate having support elements that engage with said coupling elements to fix at least one said light generating unit on said support frame;

wherein a metallic material for isolating electromagnetic interference is installed on a surface of said reflecting plate, a surface of said coupling elements, or the combination thereof.

15. The back light module according to claim 14, wherein material of said coupling elements are silica gel.

16. The back light module according to claim 14, wherein said reflecting plate is composed of an upper cover and a bottom reflecting plate.

17. The back light module according to claim 16, wherein said bottom reflecting plate has two ends bent upward.

18. The back light module according to claim 16, wherein said upper cover is L-shaped.