Backlight module with mixed-light light source module and manufacturing method thereof

• US 8,469,543 B2
• Filed: 08/11/2009
• Issued: 06/25/2013
• Est. Priority Date: 09/15/2008
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Tu, Fu-An, Wang, Chih-Lin, Lee, Yueh-Jung
• Primary Examiner(s): RALEIGH, DONALD L
• Application Number:
  US12/539,071
• Publication Number:
  US 20100067219A1
• Time in Patent Office: 1,414 Days
• Field of Search: 257/40, 257/72, 257 98-100, 257642-643, 257/759, 313498-512, 315/169.1, 315/169.3, 427/58, 427/64, 427/66, 427532-535, 427/539, 428690-691, 428/917, 438 26- 29, 438/34, 438/82, 438/455, 445 24- 25, 362543-549, 362/555, 362/800, 36224901-24903, 345589-593
• US Class Current: 362/231
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white

Abstract

A backlight module, a light source module used therein, and a manufacturing method thereof are provided. The light source module outputs a mixed light which has color coordinates falling into a target zone in a color space. The light source module has a plurality of interlaced first light sources and second light sources. The light generated by the first and the second light sources respectively have color coordinates falling into a first zone and a second zone in the color space. The first and the second zones are respectively areas having a maximum width smaller than or equal to 0.02. In addition, the first and the second zones are symmetrical relative to the target zone.

Claims

1. A light source module for outputting a mixed light which has color coordinates falling into a target zone of white gamut in a color space of CIE chromaticity diagram, said light source module comprising:

a plurality of first light sources, outputting light having color coordinates falling into a first zone of white gamut in the CIE color space, wherein said first zone has a maximum width smaller than or equal to 0.02; and

a plurality of second light sources being interlaced with said plurality of first light sources, outputting light having color coordinates falling into a second zone of white gamut in the CIE color space, wherein said second zone has a maximum width smaller than or equal to 0.02, said first zone and said second zone are symmetrical relative to the target zone in the CIE color space and the zone widths of said first zone and said second zone are distances on the CIE chromaticity diagram.

2. The light source module of claim 1, wherein said plurality of first light sources and said plurality of second light sources are aligned in a straight line.

3. The light source module of claim 2, wherein at least one of each of said first light sources between adjacent said second light sources.

4. The light source module of claim 2, wherein each of said first light sources is disposed between adjacent said first light source and said second light source.

5. The light source module of claim 1, wherein said plurality of first light sources and said plurality of second light sources are arranged in an array form.

6. The light source module of claim 5, wherein in the rows or the columns of said array, at least one of each of said first light sources is disposed between adjacent said second light sources.

7. The light source module of claim 5, wherein in the rows or the columns of said array, at least one of each of said first light sources is disposed between adjacent said second light sources.

8. The light source module of claim 1, wherein said first zone and said second zone are respectively a circular region having a radius smaller than or equal to 0.01 in the color space.

9. The light source module of claim 1, wherein said target zone has a target point, a center of said first zone is symmetrical to a center of said second zone relative to the target point.

10. A backlight module, comprising:

a light source module for outputting a mixed light which has color coordinates falling into a target zone of white gamut in a color space of CIE chromaticity diagram, said light source module including;

a plurality of first light sources, outputting light having color coordinates falling into a first zone of white gamut in the CIE color space, wherein said first zone has a maximum width smaller than or equal to 0.02; and

a plurality of second light sources being interlaced with said plurality of second light sources, outputting light having color coordinates falling into a second zone of white gamut in the CIE color space, wherein said second zone has a maximum width smaller than or equal to 0.02, said first zone and said second zone are symmetrical relative to the target zone in the CIE color space and the zone widths of said first zone and said second zone are distances on the CIE chromaticity diagram; and

an optical plate disposed close to said light source module, wherein said light source module outputs light to said optical plate.

11. The backlight module of claim 10, wherein said light source module is disposed close to a side edge of said optical plate, and said plurality of first light sources and said plurality of second light sources are distributed along the side edge of said optical plate.

12. The backlight module of claim 11, wherein said plurality of first light sources and said plurality of second light sources are aligned in a straight line.

13. The backlight module of claim 12, wherein at least one of each of said first light sources between adjacent said second light sources.

14. The backlight module of claim 12, wherein at least one of each of said first light sources between adjacent said second light sources.

15. The backlight module of claim 10, wherein said light source module is disposed close to a bottom surface of said optical plate, and the light outputted by said plurality of first light sources and said second light sources is issued toward the bottom of said optical plate.

16. The backlight module of claim 15, wherein said plurality of first light sources and said plurality of second light sources are arranged in an array form.

17. The backlight module of claim 16, wherein in the rows or the columns of said array, at least one of each of said first light sources is disposed between adjacent said second light sources.

18. The backlight module of claim 16, wherein in the rows or the columns of said array, at least one of each of said first light sources is disposed between adjacent said second light sources.

19. The backlight module of claim 10, wherein said first zone and said second zone are respectively a circular region having a radius smaller than or equal to 0.01 in the color space.

20. The backlight module of claim 10, wherein said target zone has a target point, a center of said first zone is symmetrical to a center of said second zone relative to the target point.

21. A method for manufacturing a light source module, comprising:

defining a target zone of white gamut in a color space of CIE chromaticity diagram of a mixed light generated by said light source module;

picking a plurality of first light sources which outputting light having color coordinates falling into a first zone of white gamut in the CIE color space, wherein said first zone has a maximum width as a diameter smaller than or equal to 0.02;

picking a plurality of second light sources which outputting light having color coordinates falling into a second zone of white gamut in the CIE color space, wherein said second zone has a maximum width as a diameter smaller than or equal to 0.02, said first zone and said second zone are symmetrical relative to the target zone in the CIE color space and the zone widths of said first zone and said second zone are distances on the CIE chromaticity diagram; and

interlacing said plurality of first light sources and said second light sources.

22. The method of claim 21, wherein the interlacing step includes interlacing said plurality of first light sources and said second light sources in a line manner to form a light bar.

23. The method of claim 22, wherein the step of interlacing in the line manner includes disposing at least one of each of said first light sources between adjacent said second light sources.

24. The method of claim 22, wherein the step of interlacing in the line manner comprises disposing each of said first light sources between adjacent said first light source and said second light source.

25. The method of claim 21, wherein the step of defining said target zone in the color space includes:

defining a target point; and

setting said target point as a center having a radius of 0.01 to form a circular area as said target zone.

26. The method of claim 25, wherein the step of picking said first light source comprising:

determining a first central position; and

setting said first central position as a center having a radius of 0.01 to form said first zone.

27. The method of claim 26, wherein the step of picking said second light source comprising:

determining a second central position, wherein said second central position is symmetrical to said first central position relative to the target point; and

setting said second central position as a center having a radius of 0.01 to form said second zone.