Surface light source structure of backlight module in a flat panel display

• US 8,308,317 B2
• Filed: 02/28/2008
• Issued: 11/13/2012
• Est. Priority Date: 10/04/2007
• Status: Expired due to Fees

• Current Assignee: Coretronic Corporation
• Original Assignee: Young Lighting Technology Inc. (Coretronic Corporation)
• Inventors: Chou, Wei-Jen, Hsiao, Chien-Chung, Pan, Bor-jyh, Yang, Chiao-Chih
• Primary Examiner(s): Makiya, David J
• Application Number:
  US12/071,958
• Publication Number:
  US 20090091947A1
• Time in Patent Office: 1,720 Days
• Field of Search: 362/97.3, 362/231, 315/191, 315/192
• 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: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

A surface light source structure having a circuit board, a first light emitting diode (LED) array, and a second LED array is provided. The first and second LED arrays are assembled on the circuit board. Each LED rows of the two LED arrays has a plurality of LED units connected in series. The LED rows of the first LED array are connected in parallel. The LED rows of the second LED array are connected in parallel. The LED rows of the second LED array are intersected between the LED rows of the first LED array. Positive-to-negative directions of the LED units of the first and second LED array are arranged in opposite directions.

Claims

1. A surface light source structure, applied in a backlight module, comprising:

a circuit board;

a first light emitting diode (LED) array, assembled on the circuit board and having a plurality of LED rows comprising at least a first row and a second row, each of the LED rows having a plurality of LED units, each LED unit comprises an LED package and includes at least one LED chip connected in series to define at least one serially connected series of same-color LED chips, and the LED rows of the first LED array being connected between a first positive electrode and a first negative electrode, wherein the first row and the second row of the first LED array are connected in parallel; and

a second LED array, assembled on the circuit board and having a plurality of LED rows comprising at least a first row and a second row, each of the LED rows having a plurality of LED units, each LED unit comprises an LED package and includes at least one LED chip connected in series to define at least one serially connected series of same-color LED chips, and the LED rows of the second LED array being connected between a second positive electrode and a second negative electrode, wherein the first row and the second row of the first LED array are connected in parallel, wherein the LED rows of the second LED array are alternately disposed with the LED rows of the first LED array, and positive-to-negative directions of the LED units of the first LED array and positive-to-negative directions of the LED units of the second LED array being arranged in opposite directions;

wherein each row of the first LED array is respectively separated from each row of the second LED array.

2. The surface light source structure of claim 1, wherein the LED unit of the first LED array is an LED package with at least a red, at least a blue, and at least a green LED chips.

3. The surface light source structure of claim 1, wherein the LED unit of the first LED array is an LED package with at least a blue LED chip and a packaging structure mixed with yellow-green fluorescent powders.

4. The surface light source structure of claim 1, wherein the LED unit of the first LED array is an LED package with at least a blue LED chip and a packaging structure mixed with red and greed fluorescent powders.

5. The surface light source structure of claim 1, wherein the LED units of the first LED array and those of the second LED array have the identical structure but are oppositely arranged on the circuit board.

6. The surface light source structure of claim 1, wherein the LED unit of the first LED array has at least a red LED package, at least a blue LED package, and at least a green LED package.

7. The surface light source structure of claim 1, wherein the LED rows of the first LED array and those of the second LED array are parallel to a short edge of the circuit board.

8. The surface light source structure of claim 1, further comprising a reflecting layer covering the circuit board for reflecting light provided by the LED units of the first LED array and that of the second LED array.

9. The surface light source structure of claim 1, wherein the circuit board has a through hole formed thereon, and a detecting unit is assembled in the through hole for detecting light generated by the surface light source structure.

10. The surface light source structure of claim 1, wherein the first positive electrode and the second negative electrode are located on an edge of the circuit board, and the first negative electrode and the second positive electrode are located on another edge of the circuit board.

11. The surface light source structure of claim 10, wherein the first positive electrode is electrically connected to positive terminals on a first unit of both the first LED row and the second LED row of the first LED array and the first negative electrode is electrically connected to negative terminals on a last unit of both the first LED row and the second LED row of the first LED array.

12. A backlight module, comprising:

a surface light source structure, comprising;

a circuit board;

a first light emitting diode (LED) array, assembled on the circuit board and having a plurality of LED rows comprising at least a first row and a second row, each of the LED rows having a plurality of LED units, each LED unit comprises an LED package and includes at least one LED chip connected in series to define at least one serially connected series of same-color LED chips, and the LED rows of the first LED array being connected between a first positive electrode and a first negative electrode, wherein the first row and the second row of the first LED array are connected in parallel; and

a second LED array, assembled on the circuit board and having a plurality of LED rows comprising at least a first row and a second row, each of the LED rows having a plurality of LED units, each LED unit comprises an LED package and includes at least one LED chip connected in series to define at least one serially connected series of same-color LED chips, and the LED rows of the second LED array being connected between a second positive electrode and a second negative electrode, wherein the first row and the second row of the first LED array are connected in parallel, wherein the LED rows of the second LED array are alternately disposed with the LED rows of the first LED array, and positive-to-negative directions of the LED units of the first LED array and positive-to-negative directions of the LED units of the second LED array being arranged in opposite directions;

wherein each row of the first LED array is respectively separated from each row of the second LED array; and

at least an optical film, assembled on the circuit board, for uniforming light provided by the LED units of the first LED array and that of the second LED array.

13. The backlight module of claim 12, wherein the LED unit of the first LED array is an LED package with at least a red, at least a blue, and at least a green LED chips.

14. The backlight module of claim 12, wherein the LED units of the first LED array and those of the second LED array have the identical structure but are oppositely arranged on the circuit board.

15. The backlight module of claim 12, wherein the LED unit of the first LED array has at least a red LED package, at least a blue LED package, and at least a green LED package.

16. The backlight module of claim 12, wherein the LED rows of the first LED array and those of the second LED array are parallel to a short edge of the circuit board.

17. The backlight module of claim 12, further comprising a reflecting layer covering the circuit board for reflecting light provided by the LED units of the first LED array and that of the second LED array.

18. The backlight module of claim 12, further comprising a detecting unit, wherein the circuit board has a through hole formed thereon, and the detecting unit is assembled in the through hole for detecting light generated by the surface light source structure.

19. The backlight module of claim 12, wherein the first positive electrode and the second negative electrode are located on an edge of the circuit board, and the first negative electrode and the second positive electrode are located on another edge of the circuit board.

20. The backlight module of claim 19, wherein the first positive electrode is electrically connected to positive terminals on a first unit of both the first LED row and the second LED row of the first LED array, and the first negative electrode is electrically connected to negative terminals on a last unit of both the first LED row and the second LED row of the first LED array.