# US 9,519,098 B2 · Backlight unit and liquid crystal display including the same

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- Number: US 9,519,098 B2
- Document ID: US9519098B2
- Status: Granted
- Kind: B2
- Application number: 14/540,791
- Filed: 2014-11-13
- Published: 2015-06-18
- Granted: 2016-12-13
- Earliest claimed: 2013-12-16
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: YeounJei Jung; SeHwan Park
- Web page: https://patentgrep.com/patent/US9519098B2

## CPC

- G02B 6/0073: {Light emitting diode [LED]}
- G02B 6/0086: {Positioning aspects}
- G02F 1/133608: {including particular frames or supporting means}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

## Abstract

A backlight unit for a liquid crystal display (LCD) device is capable of allowing a narrower bezel by reducing a size of a support main in the liquid crystal display (LCD) device. The backlight unit includes the support main in which an alignment hole is formed on at least one side.

## Claims

### Claim 1

A backlight unit comprising:
a light source including a flexible printed circuit board (FPCB) and a plurality of light emitting diodes (LEDs) mounted on the FPCB;
a light guide plate adjacent to the LEDs of the light source;
a support main with upper and lower surfaces open and supporting the light source and the light guide plate;
an alignment hole on a side of the support main with a center spaced apart by a first distance from a vertex of the support main; and
an extending portion extending to an inner side of the support main from the center of the alignment hole by the first distance.

### Claim 2 (depends on 1)

The backlight unit of claim 1, wherein the alignment hole has a circular shape.

### Claim 3 (depends on 1)

The backlight unit of claim 1, wherein the support main includes a plurality of mounting portions on a side wall, the FPCB of the light source is mounted on the plurality of mounting portions, and the plurality of LEDs are mounted in spaces between adjacent mounting portions.

### Claim 4 (depends on 3)

The backlight unit of claim 3, further comprising
an adhesive tape attached to an upper portion of a side wall of the support main, over the FPCB, and to an upper surface of the light guide plate.

### Claim 5

A backlight unit comprising:
a light source including a flexible printed circuit board (FPCB) and a plurality of light emitting diodes (LEDs) mounted on the FPCB;
a light guide plate adjacent to the LEDs of the light source;
a support main with upper and lower surfaces open and supporting the light source and the light guide plate and having an angled corner; and
an alignment hole on the angled corner having a semicircular shape having a center at an edge of the angled corner.

### Claim 6 (depends on 5)

The backlight unit of claim 5, wherein the support main has an extending portion extending to an inner side of the support main from a point of the alignment hole by a radius of the alignment hole.

### Claim 7 (depends on 5)

The backlight unit of claim 5, wherein the support main includes a plurality of mounting portions on a side wall, the FPCB of the light source is mounted on the plurality of mounting portions, and the plurality of LEDs are mounted in spaces between adjacent mounting portions.

### Claim 8 (depends on 5)

The backlight unit of claim 5, further comprising an adhesive tape attached to an upper portion of a side wall of the support main, over the FPCB, and to an upper surface of the light guide plate.

### Claim 9

A liquid crystal display (LCD) device comprising:
a liquid crystal panel to display an image and having an alignment key on one side; and
a backlight unit below the liquid crystal panel and to supply light to the liquid crystal panel,
wherein the backlight unit comprises:
a light source including a flexible printed circuit board (FPCB) and a plurality of light emitting diodes (LEDs) mounted on the FPCB;
a light guide plate adjacent to the LEDs; and
a support main with upper and lower surfaces open and supporting the light source and the light guide plate and having an alignment hole on a side,
wherein the support main has an extending portion extending to an inner side of the support main from the alignment hole.

### Claim 10 (depends on 9)

The LCD device of claim 9, wherein the alignment hole has a circular shape with a center spaced apart from one vertex of the support main by a first distance.

### Claim 11 (depends on 10)

The LCD device of claim 10, wherein the extending portion extends to the inner side of the support main from the center of the alignment hole by the first distance.

### Claim 12 (depends on 9)

The LCD device of claim 9, wherein a side of the support main has a sloped surface, and the alignment hole has a semicircular shape having a center at an edge of the sloped surface.

### Claim 13 (depends on 12)

The LCD device of claim 12, wherein the extending portion extends to the inner side of the support main from the edge portion of the alignment hole by a radius of the alignment hole.

### Claim 14 (depends on 9)

The LCD device of claim 9, wherein the support main includes a plurality of mounting portions on a side wall, the FPCB of the light source is mounted on the plurality of mounting portions, and the LEDs are mounted in spaces between adjacent mounting portions.

### Claim 15 (depends on 14)

The LCD device of claim 14, further comprising: an adhesive tape attached to an upper portion of a side wall of the support main, over the FPCB, and to an upper surface of the light guide plate corresponding to the mounting portions.