BACKLIGHT MODULES

• US 20060209538A1
• Filed: 04/21/2006
• Published: 09/21/2006
• Est. Priority Date: 11/17/2004
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Chang, Chih-Li, Kao, Hung-Chen
• Application Number:
  US11/379,584
• Publication Number:
  US 20060209538A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00

Abstract

Backlight modules are provided. The backlight module includes a printed circuit board, a plurality of red light emitting diodes, a plurality of blue light emitting diodes, a plurality of green light emitting diodes and a plurality of white light emitting diodes. The plurality of red, blue, green and white light emitting diodes are disposed on the printed circuit board, defining a light emitting area. The plurality of white light emitting diodes is disposed at the periphery of the light emitting area. Wherein both the blue light emitting diodes include a blue light chip and the red light emitting diodes include a red light chip respectively, the green light emitting diodes include a larger green light chip or two equal sized green light chips to the blue and red light chips.

Claims

1. A backlight module, comprising:

a printed circuit board;

a plurality of red light emitting diodes, including a red light chip respectively;

a plurality of blue light emitting diodes, including a blue light chip respectively;

a plurality of green light emitting diodes, including a green light chip respectively; and

a plurality of white light emitting diodes,

wherein the plurality of red, blue, green and white light emitting diodes are disposed on the printed circuit board, defining a light emitting area, and the size of the green light chip is larger than the red light chip and the blue light chip.

2. The backlight module as claimed in claim 1, further comprising a reflector adjoined to the printed circuit board, reflecting the light from the plurality of red, blue, green and white light emitting diodes to form a planar light emitting surface.

3. The backlight module as claimed in claim 1, wherein the light emitting area is rectangular.

4. The backlight module as claimed in claim 3, wherein the plurality of white light emitting diodes is disposed at the corners of the light emitting area.

5. The backlight module as claimed in claim 1, wherein the red, blue and green light emitting diodes are alternately arranged.

6. The backlight module as claimed in claim 1, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a zigzag pattern with the white light emitting diodes disposed at the points thereof.

7. The backlight module as claimed in claim 1, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a square-wave pattern with the white light emitting diodes disposed at the outer extremities thereof.

8. The backlight module as claimed in claim 1, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a wave shape with the white light emitting diodes disposed at the crests and the troughs thereof.

9. A backlight module, comprising:

a printed circuit board;

a red light emitting diode, including a red light chip;

a blue light emitting diode, including a blue light chip;

a green light emitting diode, including a green light chip; and

a white light emitting diode,

wherein the red, blue, green and white light emitting diodes are disposed on the printed circuit board, and the size of the green light chip is larger than the red light chip and the blue light chip.

10. The backlight module as claimed in claim 9, further comprising a reflector adjoined to the printed circuit board, reflecting the light from the red, blue, green and white light emitting diodes to form a planar light emitting surface.

11. The backlight module as claimed in claim 9, wherein the red, blue, green and white light emitting diodes are disposed along a line, the white light emitting diode is disposed at an end of the line.

12. The backlight module as claimed in claim 9, wherein the white light emitting diode is disposed at an edge of the printed circuit board.

13. The backlight module as claimed in claim 9, wherein the red, blue and green light emitting diodes are alternately arranged.

14. The backlight module as claimed in claim 9, further comprising a plurality of the red, blue, green and white light emitting diodes.

15. The backlight module as claimed in claim 14, wherein the numbers of the red, blue and green light emitting diodes are equal.

16. The backlight module as claimed in claim 14, wherein the plurality of red, blue, green and white light emitting diodes are disposed along a line and the red, blue and green light emitting diodes are alternately arranged.

17. The backlight module as claimed in claim 14, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a zigzag pattern with the white light emitting diodes disposed at the points thereof.

18. The backlight module as claimed in claim 14, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a square-wave pattern with the white light emitting diodes disposed at the outer extremities thereof.

19. The backlight module as claimed in claim 14, wherein the plurality of red, blue, green and white light emitting diodes are arranged in a wave shape with the white light emitting diodes disposed at the crests and the troughs thereof.

20. The backlight module as claimed in claim 14, wherein the plurality of white light emitting diodes is disposed at the periphery of the printed circuit board.

21. A backlight module, comprising:

a printed circuit board;

a red light emitting diode, including a red light chip;

a blue light emitting diode, including a blue light chip;

a green light emitting diode, including two green light chip; and

a white light emitting diode,

wherein the red, blue, green and white light emitting diodes are disposed on the printed circuit board, and the sizes of the red, green and blue light chips are equal.