LED backlight module for an LCD device

• US 20080170414A1
• Filed: 12/20/2007
• Published: 07/17/2008
• Est. Priority Date: 01/15/2007
• Status: Abandoned Application

• Current Assignee: Dynascan Technology Corporation (Dynascan Technology)
• Original Assignee: Dynascan Technology Corporation (Dynascan Technology)
• Inventors: Wang, Tsun-I
• Application Number:
  US12/003,177
• Publication Number:
  US 20080170414A1
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper

Abstract

An LED backlight module comprises a light-guide plate having at least one light-emit surface and a light-guide bar extended from one side of the light-guide plate, the thickness of the light-guide plate is smaller than the diameter of the light-guide bar, wherein the light-guide bar has at least one incident inlet, an LED module is disposed at the light-guide bar and corresponds to said incident inlet, light from a single LED enters into the light-guide bar via the incident inlet, then the light is totally reflected, and partial light is introduced into the light-guide plate firstly, other light is guided forward to the light-guide plate by way of curing, therefore the light is guided into the whole light-guide bar along z-axis so as to form the slim backlight module with good uniformity.

Claims

1. An LED backlight module comprising:

a light-guide plate having a light-emit surface, and any surface of the light-guide plate parallel to the light-emit surface having a microstructure; and

a light-guide bar with a smooth surface being extended from one side of the light-guide plate;

wherein the light-guide bar has at least one incident inlet, an LED module is disposed at the light-guide bar and corresponds to said incident inlet.

2. The LED backlight module according to claim 1, wherein the cross-section of said light-guide bar is selected from the group of cylindrical and polygonal.

3. The LED backlight module according to claim 1, wherein said light-guide plate and said light-guide bar are integrated as one member.

4. The LED backlight module according to claim 1, wherein said light-guide plate and said light-guide bar are independent, and transparent glue is disposed between said light-guide plate and said light-guide bar, and said light-guide plate has a refraction index similar to that of said light-guide bar.

5. The LED backlight module according to claim 1, wherein said light-guide bar is gradually tapered from said incident inlet to the other end of the light-guide bar.

6. The LED backlight module according to claim 1, further comprising a reflective plate, which is disposed on the surface of the light-guide plate parallel to said light-emit surface.

7. The LED backlight module according to claim 1, wherein the incident inlet of said light-guide bar is a total transmissivity surface, and the end surface of the other end is a total reflection surface so as to let residue light not guided into the light-guide plate be reflected to the light-guide bar.

8. The LED backlight module according to claim 1, wherein at least one reflective plate is disposed at the side of the light-guide plate.

9. The LED backlight module according to claim 1, wherein said microstructure is selected from the group of a plurality of scatterers, microlens structures and V-shaped grooves.

10. An LED backlight module comprising:

a light-guide plate having a light-emit surface and any surface of the light-guide plate parallel to the light-emit surface having a microstructure; and

a light-guide bar with a smooth surface being extended from one side of the light-guide plate;

wherein the light-guide bar has two incident inlets, two LED modules are disposed at the light-guide bar and corresponds to each of said incident inlet.

11. The LED backlight module according to claim 10, wherein the cross-section of said light-guide bar is selected from the group of cylindrical and polygonal.

12. The LED backlight module according to claim 10, wherein said light-guide plate and said light-guide bar are integrated as one member.

13. The LED backlight module according to claim 10, wherein said light-guide plate and said light-guide bar are independent, and transparent glue is disposed between said light-guide plate and said light-guide bar and has a refraction index similar to that of said light-guide plate and said light-guide bar.

14. The LED backlight module according to claim 10, wherein said light-guide bar is gradually tapered from said two incident inlets to the middle portion of the light-guide bar.

15. The LED backlight module according to claim 10, further comprising a reflective plate, which is disposed on the surface of the light-guide plate parallel to said light-emit surface.

16. The LED backlight module according to claim 10, wherein at least one reflective plate is disposed at the side of the light-guide plate.

17. The LED backlight module according to claim 10, wherein said microstructure is selected from the group of a plurality of scatterers, microlens structures and V-shaped grooves.