Backlight unit and liquid crystal display having the same

• US 20070014098A1
• Filed: 06/13/2006
• Published: 01/18/2007
• Est. Priority Date: 07/14/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang-yu, Nam, Seok-hyun, Park, Se-ki, Kang, Seock-hwan, Kim, Gi-cheri
• Granted Patent: US 7,637,626 B2
• Time in Patent Office: Days
• US Class Current: 362/29
• 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: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A backlight unit is provided. The backlight unit includes a point light source circuit board and a point light source group row comprised of a plurality of point light source groups arranged in the point light source circuit board in a line. In addition, at least a part of the point light source groups have a different rotating angle with respect to each other.

Claims

1. A backlight unit comprising:

a point light source circuit board; and

a point light source group row comprising a plurality of point light source groups arranged in the point light source circuit board in a line, wherein at least a part of the point light source groups having a different rotating angle with respect to each other.

2. The backlight unit according to claim 1, wherein a difference of the rotating angle between adjacent point light source groups is regular.

3. The backlight unit according to claim 1, wherein the rotational direction of the point light source group is regular.

4. The backlight unit according to claim 3, wherein a difference of the rotating angle between the point light source groups on both end sides of the point light source group row is about 180 degrees.

5. The backlight unit according to claim 1, wherein the rotating direction of the point light source groups is opposed with respect to a center of the point light source group row.

6. The backlight unit according to claim 5, wherein the point light source groups on both end sides of the point light source group row have the same rotating angle.

7. The backlight unit according to claim 1, further comprising a plurality of adjacent point light source group rows disposed in parallel to one another.

8. The backlight unit according to claim 7, wherein the point light source groups disposed in the adjacent point light source group rows are disposed across from each other.

9. The backlight unit according to claim 7, wherein a point light source group in one of the adjacent point light source group rows is disposed to be rotated and a point light source group in another of the adjacent point light source group rows is disposed not to be rotated.

10. The backlight unit according to claim 1, wherein the point light source group comprises a three point light source in which each of the three point light sources emits a different color from the other.

11. The backlight unit according to claim 10, wherein the three point light source is disposed in the shape of a triangle.

12. The backlight unit according to claim .1, wherein the point light source group comprises a blue point light source, a red point light source and a pair of green point light sources.

13. The backlight unit according to claim 12, wherein the point light source group is disposed in the shape of a diamond and in which the pair of the green point light sources are disposed opposite each other.

14. The backlight unit according to claim 13, wherein a difference of the rotating angle between adjacent point light source groups is about 180 degrees.

15. The backlight unit according to claim 13, wherein a pair of the green point light sources are disposed along a disposition direction of the point light source group in series.

16. A backlight unit comprising:

a point light source circuit board; and

a plurality of point light source groups arranged in the point light source circuit board, wherein at least a part of the point light source groups have a different rotating angle with respect to each other.

17. A liquid crystal display comprising:

a liquid crystal display panel;

a point light source circuit board disposed in the rear of liquid crystal display panel; and

a point light source group row comprising a plurality of point light source groups arranged in the point light source circuit board in a line, wherein at least a part of the point light source groups have a different rotating angle with respect to each other.

18. A method for a disposition of a point light source comprising:

providing a point light source circuit board; and

forming a plurality of point light source groups having different rotating angles with respect to each other and which are provided to arrange point light sources on the circuit board.