# US 7,607,800 B2 · Backlight unit and liquid crystal display with the same

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- Number: US 7,607,800 B2
- Document ID: US7607800B2
- Status: Granted
- Kind: B2
- Application number: 11/258,954
- Filed: 2005-10-27
- Published: 2006-05-04
- Granted: 2009-10-27
- Earliest claimed: 2004-10-30
- Assignees: LG Display Co., Ltd.
- Inventors: Hee Jeong Park
- Web page: https://patentgrep.com/patent/US7607800B2

## CPC

- G02F 1/133603: {with LEDs}
- Y10S 362/80: Light emitting diode
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A backlight unit and a liquid crystal display device including such a backlight unit are provided. According to an embodiment, there is provided a backlight unit comprising a plurality of light emitting diodes (LEDs) for generating light, a printed circuit board (PCB) for controlling the LEDs, a transparent scattering plate provided with a scattering optical pattern for scattering the light from the LEDs, and a diffusing plate for diffusing the light scattered by the scattering plate.

## Claims

### Claim 1

A liquid crystal display device comprising:
a liquid crystal panel having upper and lower substrates between which a liquid crystal layer is formed;
a plurality of light emitting diodes (LEDs) for generating light;
a printed circuit board (PCB) for controlling the LEDs; and
a diffusing plate for diffusing the light generated from the LEDs; and
a plurality of diverters attached on a rear surface of the diffusing plate and having a glass plate on which a scattering material is doted, wherein the diverters respectively correspond to the LEDs.

### Claim 2 (depends on 1)

The liquid crystal display device according to claim 1, further comprising:
a reflecting plate for reflecting light directed toward the PCB.

### Claim 3 (depends on 1)

The liquid crystal display device according to claim 1, wherein the diverters are formed on portions of the rear surface of the diffusing plate, and corresponds to the LEDs.

### Claim 4 (depends on 2)

The liquid crystal display device according to claim 2, wherein the reflecting plate is formed of acryl or polyester.

### Claim 5 (depends on 1)

The liquid crystal display device according to claim 1, wherein the diverters are designed to scatter light emitted in a vertical direction of the LEDs.

### Claim 6 (depends on 1)

The liquid crystal display device according to claim 1, wherein the PCB is a metal core printed circuit board (MCPCB).