Backlight modules

• US 20060056201A1
• Filed: 11/17/2004
• Published: 03/16/2006
• Est. Priority Date: 09/16/2004
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Kao, Hung-Chen, Chang, Chih-Li
• Application Number:
  US10/990,878
• Publication Number:
  US 20060056201A1
• Time in Patent Office: Days
• US Class Current: 362/631
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

Backlight modules are provided. The backlight module includes a printed circuit board, a plurality of red light emitting diode, a plurality of blue light emitting diode, a plurality of green light emitting diode and a plurality of white light emitting diode. 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.

Claims

1. A backlight module, comprising:

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,

wherein 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.

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 alternating arrayed.

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;

a blue light emitting diode;

a green light emitting diode; and

a white light emitting diode,

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

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 alternating 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 alternating 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.