BACKLIGHT ASSEMBLY AND DISPLAY APPARATUS HAVING THE SAME

• US 20080030985A1
• Filed: 08/02/2007
• Published: 02/07/2008
• Est. Priority Date: 08/07/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang-Hoon, Jeon, Eun-Chae, Kang, Eun-Jeong, Chang, Moon-Hwan, Song, Si-Joon
• Granted Patent: US 7,677,750 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: G02F 1/133603 with LEDs
• 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 assembly includes a circuit board and a plurality of point light source groups. The plurality of point light source groups includes N point light sources that generate different respective colors and being arranged on the circuit board. Here, N is a number of point light sources. One light source group of the light source groups is rotated by an angle of predetermined degrees in a clockwise direction or a counter-clockwise direction with respect to another light source group that is adjacent to the one point light source group.

Claims

1. A backlight assembly comprising:

a circuit board; and

a plurality of point light source groups including N point light sources that generate different respective colors and being arranged on the circuit board, one light source group of the light source groups rotated by an angle of predetermined degrees in a clockwise direction or a counter-clockwise direction with respect to another light source group that is adjacent to the one point light source group.

2. The backlight assembly of claim 1, wherein the N is greater than three and the predetermined rotation angle is about 360/(k×

N) degrees, k being a natural number.

3. The backlight assembly of claim 2, wherein the point light sources are arranged in a substantially squared form.

4. The backlight assembly of claim 3, wherein the point light source groups including first, second, third and fourth point light sources, positions of the first, second, third and fourth point light sources of a first point light source group being rotated by an angle of about 90 degrees with respect to positions of the first, second, third and fourth point light sources of a second point light source group that is disposed in a substantially horizontal direction.

5. The backlight assembly of claim 4, wherein the first point light source comprises a red diode generating red light, the second point light source comprises a green diode generating green light, the third point light source comprises a blue diode generating blue light, and the fourth point light source comprises a white diode generating white light.

6. The backlight assembly of claim 5, wherein the point light source groups are arranged in a matrix configuration having rows and columns and the first, second, third and fourth point light sources are arranged in a substantially squared form having substantially parallel sides with the column direction and the row direction of the matrix configuration.

7. The backlight assembly of claim 5, wherein a distance between adjacent point light source groups are substantially same.

8. The backlight assembly of claim 4, wherein the positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 180 degrees with respect to the positions of the first, second, third and fourth point light sources of a third point light source group that is disposed in a substantially perpendicular direction.

9. The backlight assembly of claim 8, further comprising:

a diffusion plate disposed on the point light source groups; and

at least one optical sheet disposed on the diffusion plate.

10. The backlight assembly of claim 2, wherein the point light source groups including first, second, third and fourth point light sources, positions of the first, second, third and fourth point light sources of a first point light source group being rotated by an angle of about 180 degrees with respect to positions of the first, second, third and fourth point light sources of a second point light source group that is disposed in a substantially perpendicular direction.

11. The backlight assembly of claim 10, wherein the first point light source comprises a red diode generating red light, the second point light source comprises a green diode generating green light, the third point light source comprises a blue diode generating blue light and the fourth point light source comprises a white diode generating white light.

12. The backlight assembly of claim 11, wherein positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 90 degrees in a clockwise direction or a counter-clockwise direction with respect to positions of the first, second, third and fourth point light sources of a third point light source group that is disposed in a horizontal direction.

13. A backlight assembly comprising:

a circuit board; and

a plurality of point light source groups arranged on the circuit board in a matrix shape having a plurality of rows and a plurality of columns, each of the point light source groups having first, second, third and fourth point light sources generating different respective colors and being arranged in a substantially squared form, positions of the first, second, third and fourth point light sources of a first point light source group being rotated by an angle of about 180 degrees with respect to positions of the first, second, third and fourth point light sources of a second point light source group that is in a same row as the first point light source group and adjacent to the first point light source group, positions of the first, second, third and fourth point light sources of the first point light source group being rotated by an angle of about 90 degrees with respect to positions of the first, second, third and fourth point light sources of a third point light source group that is in a same column as the first point light source group and adjacent to the first point light source.

14. The backlight assembly of claim 13, wherein the first point light source comprises a red diode generating red light, the second point light source comprises a green diode generating green light, the third point light source comprises a blue diode generating blue light and the fourth point light source comprises a white diode generating white light.

15. The backlight assembly of claim 14, wherein the positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 90 degrees in a clockwise direction or a counter-clockwise direction with respect to the positions of the first, second, third and fourth point light sources of the third point light source group in the same column as the first point light source group.

16. A display apparatus comprising:

a backlight assembly including;

a circuit board; and

a plurality of point light source groups including N point light sources that generate different respective colors and being arranged on the circuit board, one light source group of the light source groups rotated by an angle of predetermined degrees in a clockwise direction or a counter-clockwise direction with respect to other light source group which is adjacent to the one point light source group.

a display panel displaying images by using light from the backlight assembly.

17. The display apparatus of claim 16, wherein N is greater than three and the predetermined rotation angle is about 360/(k×

N) degrees, the k being a natural number.

18. The display apparatus of claim 17, wherein a plurality of point light source groups are arranged on the circuit board in a matrix shape having a plurality of rows and a plurality of columns, each of the point light source groups having first, second, third and fourth point light sources generating different respective colors and being arranged in a substantially squared form, positions of the first, second, third and fourth point light sources of a first point light source group being rotated by an angle of about 90 degrees with respect to positions of the first, second, third and fourth point light sources of a second point light source group that is in a same row as the first point light source group and adjacent to the first point light source group.

19. The display apparatus of claim 18, wherein the first point light source comprises a red diode generating red light, the second point light source comprises a green diode generating green light, the third point light source comprises a blue diode generating blue light and the fourth point light source comprises a white diode generating white light.

20. The display apparatus of claim 19, wherein the positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 180 degrees with respect to the positions of the first, second, third and fourth point light sources of a third point light source group of the same column as the first point light source group.

21. The display apparatus of claim 20, wherein the positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 90 degrees in a clockwise direction with respect to the positions of the first, second, third and fourth point light sources of the second point light source group of the same row as the first point light source group.

22. The display apparatus of claim 20, wherein the positions of the first, second, third and fourth point light sources of the first point light source group are rotated by an angle of about 90 degrees in a counter-clockwise direction with respect to the positions of the first, second, third and fourth point light sources of the second point light source group of the same row as the first point light source group.

23. The display apparatus of claim 20, wherein a distance between adjacent point light source groups of adjacent columns and a distance between adjacent point light source groups of adjacent rows are same.