BACKLIGHT UNIT

• US 20110292683A1
• Filed: 05/31/2011
• Published: 12/01/2011
• Est. Priority Date: 05/31/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung LED Co., Ltd. (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Jung Hun, CHOI, Sun, PARK, Jong Jin, KIM, Geun Young
• Granted Patent: US 8,672,529 B2
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence

Abstract

There is provided a backlight unit. The backlight unit includes a light guiding plate, a light source module including a substrate provided with a circuit wiring and a plurality of light emitting diode (LED) blocks each including one or more LED mounted on the substrate to be positioned vertically with respect to the substrate, the one or more LED being disposed to face a side surface of the light guiding plate, a bottom chassis including a base and a sidewall upwardly extending from a circumference of the base, and accommodating the light source module and the light guiding plate in such a manner that the one or more LED is disposed to be adjacent to the sidewall, and a driving unit controlling a current signal applied to each of the plurality of LED blocks to thereby control brightness for each LED block.

Claims

1. A backlight unit, comprising:

a light guiding plate;

a light source module including a substrate provided with a circuit wiring and a plurality of light emitting diode (LED) blocks each including one or more LED mounted on the substrate to be positioned vertically with respect to the substrate, the one or more LED being disposed to face a side surface of the light guiding plate;

a bottom chassis including a base and a sidewall upwardly extending from a circumference of the base, and accommodating the light source module and the light guiding plate in such a manner that the one or more LED is disposed to be adjacent to the sidewall; and

a driving unit controlling a current signal applied to each of the plurality of LED blocks to thereby control brightness for each LED block.

2. The backlight unit of claim 1, wherein in the light source module, the substrate is mounted on the base to be positioned horizontally with respect to the base along the sidewall of the bottom chassis in such a manner that a light emitting surface of the one or more LED faces the light guiding plate and the other surface of the one or more LED faces the sidewall of the bottom chassis.

3. The backlight unit of claim 1, wherein the light source module is disposed between at least one side surface of the light guiding plate and the sidewall of the bottom chassis.

4. The backlight unit of claim 1, wherein the light source module includes a plurality of light source modules, and the plurality of light source modules include a first light source module and a second light source module respectively disposed at one side surface of the light guiding plate and the other side surface of the light guiding plate.

5. The backlight unit of claim 4, further comprising a third light source module and a fourth light source module respectively disposed at side surfaces of the light guiding plate, positioned vertically with respect to the first and second light source modules, while having the light guiding plate therebetween, and having a configuration the same as that of the first and second light source modules.

6. The backlight unit of claim 1, wherein the light guiding plate is formed of at least one or more division member.

7. The backlight unit of claim 1, wherein the light guiding plate is provided with one or more groove portion altering a path of light.

8. The backlight unit of claim 7, wherein the groove portion is depressed at a predetermined depth from a lower surface of the light guiding plate towards an upper surface of the light guiding plate.

9. The backlight unit of claim 7, wherein the groove portion is disposed in a horizontal direction or/and a vertical direction of the light guiding plate from a center of the light guiding plate.

10. The backlight unit of claim 1, wherein the one or more LED includes a body having a cavity formed therein and is equipped with lead terminals along a side surface and an end surface of the body, the lead terminals electrically connected to the circuit wiring to thereby be mounted on the substrate via the side surface and the end surface.

11. The backlight unit of claim 10, wherein the lead terminals include a first lead provided to be co-planar with a rear surface of the body and projected outwardly from the end surface of the body, and a second lead bent vertically from an end of the first lead to be extended towards a front surface of the body and having one end bent horizontally towards the side surface of the body.

12. The backlight unit of claim 11, wherein the second lead has an overall ‘

L’

shaped structure so as to be parallel with the end surface and the side surface of the body.

13. The backlight unit of claim 10, wherein the one or more LED includes a heat sink penetrating the body to be outwardly exposed through the rear surface of the body, in a bottom surface of the cavity.

14. The backlight unit of claim 1, further comprising a reflecting plate disposed under the light guiding plate.

15. The backlight unit of claim 1, further comprising an optical sheet disposed on the light guiding plate.