Light guide plate and backlight module using same

• US 7,367,704 B1
• Filed: 12/08/2006
• Issued: 05/06/2008
• Est. Priority Date: 10/27/2006
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chang, Jen-Tsorng
• Primary Examiner(s): Husar; Stephen F
• Application Number:
  US11/608,640
• Publication Number:
  US 20080101089A1
• Time in Patent Office: 515 Days
• Field of Search: 349/65, 349/68, 362/27, 362/511, 362/608, 362/610, 362/612, 362/613, 362/621, 362/625, 362/626, 385/33, 385/129, 385/146, 385/901
• US Class Current: 362/621
• CPC Class Codes: F21V 7/05 plane
• CPC Class Codes: G02B 6/0016 Grooves, prisms, gratings, scattering particles or rough surfaces
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A light guide plate includes having a block body includes a bottom surface, a light emitting surface on an opposite side of the light guide plate to the bottom surface, at least three spaced light incident surfaces, and at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body. A backlight module with the light guide plate and at least three light sources is also provided.

Claims

1. A light guide plate having a block body, comprising:

a bottom surface;

a light emitting surface on an opposite side of the light guide plate to the bottom surface;

at least three spaced light incident surfaces adjoining the bottom surface; and

at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body.

2. The light guide plate as claimed in claim 1, wherein the block body has a plurality of dots or v-shaped grooves formed on the bottom surface thereof.

3. The light guide plate as claimed in claim 1, further comprising a plurality of reflective side surfaces adjoining the bottom surface and the light emitting surface.

4. The light guide plate as claimed in claim 3, wherein the light incident surfaces and the bottom surface are located on a same plane.

5. The light guide plate as claimed in claim 3, wherein each of the light incident surfaces obliquely interconnects the bottom surface and the light emitting surface.

6. The light guide plate as claimed in claim 1, wherein each of the fresnel lens portions comprises a plurality of concentric annular grooves formed on the respective light incident surface.

7. A backlight module, comprising:

a light guide plate having a block body, the light guide plate comprising;

a bottom surface;

a light emitting surface on an opposite side of the light guide plate to the bottom surface;

at least three spaced light incident surfaces adjoining the bottom surface; and

at least three fresnel lens portions provided on the respective at least three light incident surfaces of the block body;

and

at least three light sources, each of the light sources facing toward the respective three spaced light incident surfaces.

8. The backlight module as claimed in claim 7, wherein the block body has a plurality of dots or v-shaped grooves formed on the bottom surface thereof.

9. The backlight module as claimed in claim 7, further comprising a plurality of reflective side surfaces adjoining the bottom surface and the light emitting surface.

10. The backlight module as claimed in claim 9, wherein the light incident surfaces and the bottom surface are located on a same plane.

11. The backlight module as claimed in claim 9, wherein the light incident surface obliquely interconnects the bottom surface and the light emitting surface.

12. The backlight module as claimed in claim 7, wherein each of the fresnel lens portions comprises a plurality of concentric annular grooves formed on the respective light incident surface.

13. The backlight module as claimed in claim 7, wherein the at least three light sources comprises a red light emitting diode for emitting red light, a green light emitting diode for emitting light, and a blue light emitting diode for emitting blue light.

14. The backlight module as claimed in claim 7, wherein each of the at least three light sources comprises a light emitting diode having a red light emitting chip for emitting red light, a green light emitting chip for emitting green light, and a blue light emitting chip for emitting blue light therein.