LED backlight module

• US 20070001185A1
• Filed: 05/18/2006
• Published: 01/04/2007
• Est. Priority Date: 06/29/2005
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lai, Pong, Lu, Ying, Yang, Cheng, Wu, Ching
• Application Number:
  US11/435,842
• Publication Number:
  US 20070001185A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A LED backlight module including a diffusion plate, at least an optical devices, at least a light-emitting diode and a second reflection surface is provided. The optical device is provided underneath the diffusion plate and has a first reflection surface. The light-emitting diode is provided underneath the optical device, for emitting light to the first reflection surface where first reflection of the light is performed. The second reflection surface is provided underneath the light-emitting diode, for receiving the light of the first reflection and performing second reflection of the received light. By controlling light paths of LED with the optical devices, light emitted from LED may be leaded to a specific direction instead of directly emitting from a front surface of LED, so as to achieve the performance of color-mixing and uniform distribution.

Claims

1. A light-emitting diode (LED) backlight module comprising:

a diffusion plate;

at least an optical device provided underneath the diffusion plate and having a first reflection surface;

at least a light-emitting diode provided underneath the at least an optical device, for emitting light to the first reflection surface where first reflection of the light is performed; and

a second reflection surface provided underneath the at least a light-emitting diode, for receiving the light of the first reflection and performing second reflection of the received light.

2. The LED backlight module according to claim 1, wherein the at least an optical device has a structure made of a material of high transparency.

3. The LED backlight module according to claim 2, wherein the material of high transparency is one of plastic and glass.

4. The LED backlight module according to claim 1, wherein the first reflection surface of the at least an optical device has one of a metal layer and a dielectric layer.

5. The LED backlight module according to claim 4, wherein the metal layer has a structure formed by one of an evaporation treatment and a sputtering treatment.

6. The LED backlight module according to claim 5, wherein the metal layer has a structure formed by sputtering one of silver and -aluminum on the first reflection surface of the optical device made of plastic.

7. The LED backlight module according to claim 4, wherein the dielectric layer has a structure formed by stacking multiple layers of dielectric materials.

8. The LED backlight module according to claim 7, wherein the dielectric layer has a structure formed by stacking TiO₂ on the first reflection surface of the optical device made of glass.

9. The LED backlight module according to claim 1, wherein the first reflection surface has a geometric cross-section.

10. The LED backlight module according to claim 1, wherein the first reflection surface has a cross-section of one of V-shape, curve, circle, ellipse, and sawtooth shape.

11. The LED backlight module according to claim 10, wherein an included angle between the first reflection surface of the V-shape cross-section and the light-emitting diode ranges from 1 degree to 60 degrees.

13. The LED backlight module according to claim 1, wherein the LED backlight module includes a plurality of optical devices and a plurality of light-emitting diodes having a corresponding number to a number of the optical devices.

14. The LED backlight module according to claim 13, wherein the light-emitting diodes have a random permutation of red, green and blue LEDs.

15. The LED backlight module according to claim 1, wherein the at least a light-emitting diode is a white light-emitting diode.

16. The LED backlight module according to claim 1, further comprising a brightness enhancement film provided over the diffusion plate.

17. The LED backlight module according to claim 1, wherein a side surface of the at least an optical device is a slanted surface.

18. The LED backlight module according to claim 1, wherein the second reflection surface is provided underneath the light-emitting diode and positioned on a side surface of the LED backlight module.

19. The LED backlight module according to claim 18, wherein the second reflection surface is made of a reflection sheet.

20. The LED backlight module according to claim 1, wherein the second reflection surface is made of a reflection sheet.

12. (canceled)