Liquid crystal display device and backlight module thereof

• US 20050270766A1
• Filed: 10/21/2004
• Published: 12/08/2005
• Est. Priority Date: 06/08/2004
• Status: Abandoned Application

• Current Assignee: Prodisc Technology
• Original Assignee: Prodisc Technology
• Inventors: Lin, Yu-Sheng, Lu, Yi-Chun, Chiu, Chang Mo, Chou, Yen-Chun, Kung, Ta-Kun
• Application Number:
  US10/968,946
• Publication Number:
  US 20050270766A1
• Time in Patent Office: Days
• US Class Current: 362/97.300
• CPC Class Codes: G02F 1/133507 Films for enhancing the luminance
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• 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: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia

Abstract

A backlight module comprises a light transmissive substrate, an optical film, and at least one light source. In this case, the optical film has a first surface and a second surface opposite to the first surface. The first surface of the optical film is connected to the transparent surface, and the second surface of the optical film has at least one fresnel area. The light source is disposed at one side of the light transmissive substrate.

Claims

1. A backlight module, comprising:

a light transmissive substrate;

an optical film having a first surface and a second surface opposite to the first surface, the first surface of the optical film connected to the light transmissive substrate, the second surface of the optical film having at least one fresnel area; and

at least one light source disposed at one side of the light transmissive substrate.

2. The backlight module according to claim 1, further comprising a casing having an opening, the light transmissive substrate connected to the opening of the casing, a storage space formed between the casing and the light transmissive substrate, the light source attached to the casing and disposed in the storage space.

3. The backlight module according to claim 1, wherein the optical film is disposed between the light transmissive substrate and the light source.

4. The backlight module according to claim 1, wherein the light transmissive substrate is disposed between the light source and the optical film.

5. The backlight module according to claim 1, wherein the fresnel area has at least one focal point.

6. The backlight module according to claim 1, wherein the fresnel area is a linear fresnel lens.

7. The backlight module according to claim 1, wherein the light source is a linear light source, a cold cathode fluorescent tube (CCFL) or a light-emitting diode array (LED array).

8. The backlight module according to claim 1, wherein a quantity of the light source is substantially equal to a quantity of the fresnel area, the position of the light source is related to the position of the fresnel area.

9. The backlight module according to claim 1, further comprising a diffuser wherein the light transmissive substrate is disposed between the optical film and the diffuser.

10. The backlight module according to claim 9, wherein the diffuser is disposed near the light transmissive substrate or disposed on the light transmissive substrate.

11. The backlight module according to claim 1, further comprising a diffuser wherein the optical film is disposed between the light transmissive substrate and the diffuser.

12. The backlight module according to claim 11, wherein the diffuser is disposed near the optical film or disposed on the optical film.

13. The backlight module according to claim 1, wherein the light transmissive substrate and/or the optical film is mixed with diffusion powder.

14. The backlight module according to claim 1, wherein at least one pattern is formed on at least one surface of the light transmissive substrate.

15. A liquid crystal display, comprising:

a liquid crystal module;

a light transmissive substrate;

an optical film having a first surface and a second surface opposite to the first surface, the first surface of the optical film connected to the transparent surface, the second surface of the optical film having at least a fresnel area; and

at least one light source disposed at one side of the light transmissive substrate, and the light transmissive substrate disposed between the liquid crystal module and the light source.

16. The liquid crystal display according to claim 15, further comprising a casing having an opening, the light transmissive substrate connected to the opening of the casing, a storage space formed between the casing and the light transmissive substrate, the light source attached to the casing and disposed in the storage space.

17. The liquid crystal display according to claim 15, wherein the optical film is disposed between the light transmissive substrate and the light source.

18. The liquid crystal display according to claim 15, wherein the light transmissive substrate is disposed between the light source and the optical film.

19. The liquid crystal display according to claim 15, wherein the fresnel area has at least one focal point.

20. The liquid crystal display according to claim 15, wherein the fresnel area is a linear fresnel lens.

21. The liquid crystal display according to claim 15, wherein the light source is a linear light source, a cold cathode fluorescent tube (CCFL) or a light-emitting diode array (LED array).

22. The liquid crystal display according to claim 15, wherein a quantity of the light source is substantially equal to a quantity of the fresnel area, the position of the light source is related to the position of the fresnel area.

23. The liquid crystal display according to claim 15, further comprising a diffuser wherein the light transmissive substrate is disposed between the optical film and the diffuser.

24. The liquid crystal display according to claim 23, wherein the diffuser is disposed near the light transmissive substrate or disposed on the light transmissive substrate.

25. The liquid crystal display according to claim 15, further comprising a diffuser wherein the optical film is disposed between the light transmissive substrate and the diffuser.

26. The liquid crystal display according to claim 25, wherein the diffuser is disposed near the optical film or disposed on the optical film.

27. The liquid crystal display according to claim 15, wherein the light transmissive substrate and/or the optical film is mixed with diffusion powder.

28. The liquid crystal display according to claim 15, wherein at least one pattern is formed on at least one surface of the light transmissive substrate.