Back light module of liquid crystal display device

• US 7,207,707 B2
• Filed: 04/28/2004
• Issued: 04/24/2007
• Est. Priority Date: 02/18/2004
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Huang, Hsin-Tao, Chu, Chun-Chieh
• Primary Examiner(s): Luebke; Renee
• Assistant Examiner(s): Dzierzynski; Evan
• Application Number:
  US10/833,173
• Publication Number:
  US 20050180171A1
• Time in Patent Office: 1,091 Days
• Field of Search: 362/12, 362/606, 362/608, 362/632, 362/633, 362/623, 362/624, 362/609
• US Class Current: 362/614
• 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, the device constructed by:

forming a support frame having support elements thereon;

installing at least two light generating units having two coupling elements disposed thereon so as to engage with each of said support elements respectively;

installing a light reflecting plate installed on said support frame for reflecting light generated by said light generating unit upwards, said reflecting plate having two upward bent ends formed integrally with said light reflecting plate; and

a light guiding plate installed on said reflecting plate for guiding the light, the light guiding plate received by said light reflecting plate;

wherein a metallic material for isolating electro-magnetic interference is coated 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 electro-magnetic 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 wherein two ends of said reflecting plate are bent upward, the upward bent ends formed integrally with said light reflecting plate;

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

at least a pair of light generating units installed in corresponding said indentation, wherein the light generated by said light generating units upwards is reflected upwards by said light reflecting plate and then guided by said light guiding plate towards a LCD panel, and said light generating units have two coupling elements disposed thereon to engage with said support elements respectively installed on two ends thereof;

wherein a metallic material for isolating electro-magnetic interference is coated 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 a pair of light generating units having two coupling elements respectively installed thereon;

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

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

wherein a metallic material for isolating electro-magnetic interference is coated 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.

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

a support frame;

at least one light generating unit disposed over said support frame, having two coupling elements disposed thereon;

a light guiding plate installed over said support frame and adjacent to said light generating units for guiding the light; and

a light reflecting plate disposed between said light guiding plate and said support frame, having at least one extending portion bent upward to cover said light generating unit.

20. The backlight module of claim 19, wherein said coupling elements respectively install at two ends of said light generating unit.

21. The backlight module of claim 19, wherein said light reflecting plate further comprises a plurality of support elements engaging to fix said light generating unit.

22. The backlight module of claim 20, wherein said support frame further comprises a plurality of support elements engaging to fix said light generating unit.

23. The backlight module of claim 19, wherein said reflecting plate is formed of a metallic material for isolating electro-magnetic interference.

24. The backlight module of claim 19, wherein a metallic material for isolating electro-magnetic interference is coated on a surface of said reflecting plate, a surface of said coupling elements, or the combination thereof.

25. The backlight module of claim 19, wherein said light guiding plate further comprises a plurality of support elements engaging to fix said light generating unit.