Surface light source device and backlight unit having the same

• US 20080025019A1
• Filed: 05/22/2007
• Published: 01/31/2008
• Est. Priority Date: 07/25/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Kim, Bum Jin
• Granted Patent: US 7,476,003 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

Abstract

A surface light source device having LED clusters arranged in a matrix of rows and columns on a board. Each of the LED clusters includes red, green and blue LEDs arranged in a triangle. The LED clusters are grouped into A, E, C and D, which have the red LEDs located top, right, bottom and left, respectively, from a center of the triangle. The matrix of the LED clusters includes alternating first and second type rows arranged repeatedly from top to bottom of the matrix, terminating with the second type row. The first type rows each have first type cluster arrays of the LED clusters arranged in a repeating order of E, C, D and C from left to right. The second type rows each have second type cluster arrays of the LED clusters arranged in a repeating order of A, D, A and D from left to right.

Claims

1. A surface light source device comprising:

a board; and

a plurality of light emitting diode clusters arranged in a matrix of rows and columns on the board, each of the light emitting diode clusters including a red light emitting diode, a green light emitting diode and a blue light emitting diode arranged in a triangular configuration,

wherein the light emitting diode clusters are grouped into A, E, C and D clusters according to locations of the red light emitting diodes, the A, E, C and D clusters having the red light emitting diodes located top, right, bottom and left, respectively, from a center of the triangular configuration,

wherein the matrix of the light emitting diode clusters includes alternating first and second type rows arranged repeatedly from top to bottom of the matrix, terminating with a second type row,

wherein each of the first type rows has first type cluster arrays of the light emitting diode clusters arranged in a repeating order of E, C, D and C from left to right, terminating with D and C sequentially, and

wherein each of the second type rows has second type cluster arrays of the light emitting diode clusters arranged in a repeating order of A, D, A and D from left to right, terminating with A and D sequentially.

2. The surface light source device according to claim 1, wherein in the matrix of the first and second type cluster arrays, odd rows have only the first type cluster arrays arranged in a repeating order, and even rows have only the second type cluster arrays arranged in a repeating order.

3. The surface light source device according to claim 1, wherein the matrix of the light emitting diode clusters includes a plurality of third type cluster arrays arranged repeatedly across the board, each of the third type cluster arrays comprising a 2×

4 matrix which has an upper row of the first type cluster arrays and a lower row of the second type cluster arrays.

4. The surface light source device according to claim 1, wherein in the matrix of the first and second type cluster arrays, odd rows have the first type cluster arrays arranged in a repeating order, terminating with D and C sequentially, and even rows have the second type cluster arrays arranged in a repeating order, terminating with A and D sequentially.

5. The surface light source device according to claim 1, wherein each of the light emitting diode clusters comprises a package including a package body mounted on the board and red, green and blue light emitting diode chips mounted on the package body.

6. The surface light source device according to claim 1, wherein each of the red, green and blue light emitting diodes comprises a package including a package body mounted on the board and a light emitting diode chip mounted on the package body.

7. The surface light source device according to claim 1, wherein each of the red, green and blue light emitting diodes comprises a light emitting diode chip directly mounted on the board and a resin encapsulant surrounding the light emitting diode chip.

8. A surface light source device comprising:

a board;

a plurality of light emitting diode clusters arranged in a matrix of rows and columns on the board, each of the light emitting diode clusters including a red light emitting diode, a green light emitting diode and a blue light emitting diode arranged in a triangular configuration; and

a diffusing plate disposed over the light emitting diode clusters at a predetermined interval from the board,

wherein the light emitting diode clusters are grouped into A, E, C and D according to locations of the red light emitting diodes, the A, E, C and D clusters having the red light emitting diodes located top, right, bottom and left, respectively, from a center of the triangular configuration,

wherein the matrix of the light emitting diode clusters includes alternating first and second type rows arranged repeatedly from top to bottom of the matrix, terminating with a second type row,

wherein each of the first type rows has first type cluster arrays of the light emitting diode clusters arranged in a repeating order of E, C, D and C from left to right, terminating with D and C sequentially, and

wherein each of the second type rows has second type cluster arrays of the light emitting diode clusters arranged in a repeating order of A, D, A, and D from left to right, terminating with A and D sequentially.

9. The surface light source device according to claim 8, wherein in the matrix of the first and second type cluster arrays, odd rows have only the first type cluster arrays arranged in a repeating order, and even rows have the second type cluster arrays arranged in a repeating order.

10. The surface light source device according to claim 8, wherein the matrix of the light emitting diode clusters includes a plurality of third type cluster arrays arranged repeatedly across the board, each of the third type cluster arrays comprising a 2×

4 matrix which has an upper row of the first type cluster arrays and a lower row of the second type cluster arrays.

11. The surface light source device according to claim 8, wherein in the matrix of the first and second type cluster arrays, odd rows have the first type cluster arrays arranged in a repeating order, terminating with D and C sequentially, and even rows have the second type cluster arrays arranged in a repeating order, terminating with A and D sequentially.

12. The surface light source device according to claim 8, wherein each of the light emitting diode clusters comprises a package including a package body mounted on the board and the red, green and blue light emitting diode chips mounted on the package body.

13. The surface light source device according to claim 8, wherein each of the red, green and blue light emitting diodes comprises a package including a package body mounted on the board and a light emitting diode chip mounted on the package body.

14. The surface light source device according to claim 8, wherein each of the red, green and blue light emitting diodes comprises a light emitting diode chip directly mounted on the board and a resin encapsulant surrounding the light emitting diode chip.