BACKLIGHT UNIT

• US 20090021932A1
• Filed: 07/18/2008
• Published: 01/22/2009
• Est. Priority Date: 07/19/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung LED Co., Ltd. (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Dae Yeon, HAHM, Hun Joo, SHIN, Chang Ho, SHIN, Jae Hong, JEONG, Young June
• Granted Patent: US 7,905,618 B2
• Time in Patent Office: Days
• US Class Current: 362/237
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H05K 1/142 Arrangements of planar printed circuit boards in the same plane, e.g. auxiliary printed circuit insert mounted in a main printed circuit

Abstract

Provided is a backlight unit including a plurality of light emitting diodes (LEDs) that emit light; a plurality of LED modules having a printed circuit board (PCB) which supports and drives the plurality of LEDs; a plurality of optical sheets that are attached to the top surfaces of the respective LED modules; and a plurality of heat radiating pads that are attached to the rear surfaces of the respective LED modules.

Claims

1. A backlight unit comprising:

a plurality of light emitting diodes (LEDs) that emit light;

a plurality of LED modules having a printed circuit board (PCB) which supports and drives the plurality of LEDs;

a plurality of optical sheets that are attached to the top surfaces of the respective LED modules; and

a plurality of heat radiating pads that are attached to the rear surfaces of the respective LED modules.

2. The backlight unit according to claim 1, wherein the LED module, the optical sheet, and the heat radiating pad are formed to have the same size.

3. The backlight unit according to claim 1, wherein the optical sheet and the heat radiating pad have a smaller size than the LED module.

4. The backlight unit according to claim 1, wherein the LED modules are arranged in parallel to each other in the longitudinal direction thereof.

5. The backlight unit according to claim 1, wherein the LED modules are arranged so as to surround a predetermined region.

6. The backlight unit according to claim 1, wherein the plurality of LEDs are continuously arranged in a triangle or rectangle shape.

7. The backlight unit according to claim 1, wherein the plurality of LEDs are separated for each block in a circuit manner such that some LEDs among the plurality of LEDs can be partially turned on/off.