Light emitting diode backlight unit and liquid crystal display device using the same

• US 20060092346A1
• Filed: 10/28/2005
• Published: 05/04/2006
• Est. Priority Date: 10/30/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Moon, Jeong Min, Park, Hee Jeong
• Granted Patent: US 7,633,577 B2
• Time in Patent Office: Days
• US Class Current: 349/61
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: H05K 1/05 Insulated conductive substrates, e.g. insulated metal substrate
• 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
• CPC Class Codes: H05K 1/181 associated with surface mounted components

Abstract

A light emitting diode backlight unit and a liquid crystal display device having the same is provided. The light emitting diode improves efficiency of a backlight and productivity by mounting light emitting diodes and drive components onto the same printed circuit board. The light emitting diode (LED) backlight unit includes a printed circuit board, a plurality of light emitting diodes mounted onto the printed circuit board, a plurality of drive components mounted onto the printed circuit board and driving the light emitting diodes and a control unit electrically connected with the printed circuit board and controlling the drive components.

Claims

1. A light emitting diode (LED) backlight unit comprising:

a printed circuit board;

a plurality of light emitting diodes (LEDs) mounted on the printed circuit board;

a plurality of drive components mounted on the printed circuit board and driving the light emitting diodes; and

a control unit operatively coupled with the printed circuit board and controlling the drive components.

2. The LED backlight unit of claim 1, wherein one of the plurality of LEDs generates at least one color of red, green and blue.

3. The LED backlight unit of claim 1, wherein one of the plurality of LEDs generates white light.

4. The LED backlight unit of claim 1, wherein one of the plurality of LEDs is embedded in one lamp thereby generating at least one color of red, green, blue and white.

5. The LED backlight unit of claim 1, wherein all the LEDs which generate red, green and blue are embedded in one lamp.

6. The LED backlight unit of claim 1, wherein the printed circuit board is constructed as an metal core printed circuit board (MCPCB) in which an aluminum layer is laminated at a lower surface.

7. A light emitting diode backlight (LED) unit comprising:

a first printed circuit board;

a plurality of light emitting diodes mounted on the first printed circuit board;

a second printed circuit board operatively coupled with the first printed circuit board with a connector, the second printed circuit board having a plurality of drive components for driving the LEDs mounted thereon; and

a control unit operatively coupled with the second printed circuit board and controlling the drive components.

8. A liquid crystal display device comprising:

a liquid crystal display (LCD) panel;

a light emitting diode backlight unit installed at the rear or side of the LCD panel and irradiating light onto the LCD panel, the light emitting diode backlight unit comprising;

a printed circuit board;

a plurality of light emitting diodes mounted on the printed circuit board; and

a plurality of drive components for driving the light emitting diodes, the plurality of drive components mounted on the printed circuit board; and

a case for coupling the LCD panel and the backlight unit with each other.

9. The LCD device of claim 8, wherein the drive components are mounted onto the printed circuit board onto which the light emitting diodes are mounted to thereby minimize resistance of a signal line which substantially supplies signals to the light emitting diodes.