Liquid crystal display and backlight module thereof

• US 20060139953A1
• Filed: 03/17/2005
• Published: 06/29/2006
• Est. Priority Date: 12/24/2004
• Status: Abandoned Application

• Current Assignee: Prodisc Technology
• Original Assignee: Prodisc Technology
• Inventors: Chiu, Chung-Mo, Chou, Yen-Chun
• Application Number:
  US11/081,562
• Publication Number:
  US 20060139953A1
• Time in Patent Office: Days
• US Class Current: 362/613
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• 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

Abstract

A backlight module includes an optical film substrate and a plurality of light sources. The optical film substrate has a first surface and a second surface opposite to the first surface. The first surface of the optical film substrate has a plurality of Fresnel areas. The Fresnel areas are disposed on the first surface in an array arrangement. The light sources are disposed at one side of the optical film substrate. In addition, a liquid crystal display including the backlight module is provided.

Claims

1. A backlight module, comprising:

an optical film substrate, which has a first surface and a second surface opposite to the first surface, wherein the first surface has a plurality of fresnel areas, and the fresnel areas are located on the first surface in an array arrangement; and

a plurality of light sources, which are disposed at one side of the optical film substrate.

2. The backlight module of claim 1, further comprising:

a case, which has an opening, wherein the optical film substrate is jointed with the opening, the optical film substrate and the case form an accommodating space, and the light sources are disposed in the accommodating space.

3. The backlight module of claim 1, wherein the first surface of the optical film substrate faces to the light sources.

4. The backlight module of claim 1, wherein the second surface of the optical film substrate faces to the light sources.

5. The backlight module of claim 1, wherein each of the Fresnel areas has a focal length.

6. The backlight module of claim 1, wherein each of the light sources is corresponding to one of the Fresnel areas.

7. The backlight module of claim 1, wherein each of the light sources is corresponding to at least one of the Fresnel areas.

9. The backlight module of claim 1, wherein the optical film substrate comprises an optical film and a transparent substrate, and the optical film attaches to the transparent substrate.

10. The backlight module of claim 9, further comprising:

a diffuser, wherein the transparent substrate is located between the optical film and the diffuser.

11. The backlight module of claim 10, wherein the diffuser is disposed adjacent to the transparent substrate.

12. The backlight module of claim 1, further comprising:

a diffuser, wherein the optical film substrate is located between the light sources and the diffuser.

13. The backlight module of claim 12, wherein the diffuser is disposed adjacent to the optical film substrate.

8. The backlight module of claim I, wherein the light sources are a light-emitting diode (LED) array.

14. A liquid crystal display, comprising:

a liquid crystal panel; and

a backlight module, which comprises;

an optical film substrate, which has a first surface and a second surface opposite to the first surface, wherein the first surface has a plurality of fresnel areas, and the fresnel areas are located on the first surface in an array arrangement; and

a plurality of light sources, which are disposed at one side of the optical film substrate, wherein the optical film substrate is located between the liquid crystal panel and the light sources.

15. The liquid crystal display of claim 14, further comprising:

a case, which has an opening, wherein the optical film substrate is jointed with the opening, the optical film substrate and the case form an accommodating space, and the light sources are disposed in the accommodating space.

16. The liquid crystal display of claim 14, wherein the first surface of the optical film substrate faces to the light sources.

17. The liquid crystal display of claim 14, wherein the second surface of the optical film substrate faces to the light sources.

18. The liquid crystal display of claim 14, wherein each of the Fresnel areas has a focal length.

19. The liquid crystal display of claim 14, wherein each of the light sources is corresponding to one of the Fresnel areas.

20. The liquid crystal display of claim 14, wherein each of the light sources is corresponding to at least one of the Fresnel areas.

21. The liquid crystal display of claim 14, wherein the light sources are a light-emitting diode (LED) array.

22. The liquid crystal display of claim 14, wherein the optical film substrate comprises an optical film and a transparent substrate, and the optical film attaches to the transparent substrate.

23. The liquid crystal display of claim 22, further comprising:

a diffuser, wherein the transparent substrate is located between the optical film and the diffuser.

24. The liquid crystal display of claim 23, wherein the diffuser is disposed adjacent to the transparent substrate.

25. The liquid crystal display of claim 14, further comprising:

a diffuser, wherein the optical film substrate is located between the light sources and the diffuser.

26. The liquid crystal display of claim 25, wherein the diffuser is disposed adjacent to the optical film substrate.