# US 9,753,315 B2 · Liquid crystal display device having fixing unit for optical sheet

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- Number: US 9,753,315 B2
- Document ID: US9753315B2
- Status: Granted
- Kind: B2
- Application number: 14/581,800
- Filed: 2014-12-23
- Published: 2016-02-11
- Granted: 2017-09-05
- Earliest claimed: 2014-08-08
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Sang-Dae Park; Min-Jin Lee; Sung-Hwan Yoon
- Web page: https://patentgrep.com/patent/US9753315B2

## CPC

- G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02B 6/0088: {of the light guide or other optical sheets in the package}
- G02F 1/133514: {Colour filters}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133314: {Back frames}
- G02F 2201/465: Snap -fit
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A liquid crystal display device includes a liquid crystal display panel; a backlight assembly providing light to the liquid crystal display panel and including an optical sheet; a bottom cover supporting the liquid crystal display panel and the backlight assembly and including a side surface having an indented portion; and a fixing unit combined with the indented portion of the side surface of the bottom cover to fix the optical sheet, wherein the optical sheet includes a projecting portion, which is cut to include a fixing part and bridges and is united with the fixing unit.

## Claims

### Claim 1

A liquid crystal display device comprising:
a liquid crystal display panel;
a backlight assembly providing light to the liquid crystal display panel and including an optical sheet, the optical sheet comprising a planar surface facing the liquid crystal display panel in a first direction and a projecting portion coupled to the planar surface, the projecting portion being bent to face in a second direction, the projecting portion comprising:
an elongated part with a surface facing in the second direction,
bridges each coupled between the planar surface and the elongated part, and
a fixing part coupled to the elongated part between the bridges;
a bottom cover supporting the liquid crystal display panel and the backlight assembly, the bottom cover including a side surface having an indented portion, the side surface facing in the second direction; and
a fixing unit coupled to the indented portion of the side surface of the bottom cover, the fixing part of the projection portion secured to the fixing unit.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the bottom cover includes a bottom surface facing the liquid crystal display panel in the first direction, the bottom surface having a first hole and a protrusion towards the second direction formed in the indented portion of the side surface,
wherein the fixing unit includes (i) a first surface facing the bottom surface in the first direction, (ii) a second surface and (iii) a third surface, the second surface and the third surface facing in the second direction, the third surface offset from the second surface in the second direction,
wherein the second surface is disposed at a first end of the first surface, and a second end of the first surface is bent towards the liquid crystal display panel in the first direction and inserted into the first hole of the bottom surface, and
wherein the second surface has a second hole through which the protrusion of the bottom surface is inserted, and the second surface and the third surface together have a third hole at which the fixing part of the projecting portion is secured.

### Claim 3 (depends on 2)

The display device of claim 2, wherein a hemming treatment is performed between the second surface and the third surface.

### Claim 4 (depends on 1)

The display device of claim 1, wherein each of the bridges has a width of less than 2 mm.

### Claim 5 (depends on 1)

The display device of claim 1, wherein the fixing unit has a line shape and includes an elastic material, and the fixing unit is bent to include a connecting part and a fastening part,
wherein the connecting part is coupled to a bottom surface of the bottom cover, the bottom surface facing the liquid crystal display panel in the first direction, and
wherein the fastening part corresponds to the side surface of the bottom cover and the fixing part is secured to the fastening part.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the fastening part is divided into two pieces spaced apart from each other.

### Claim 7 (depends on 1)

The display device of claim 1, wherein the fixing unit includes more than two connecting parts.

### Claim 8

A liquid crystal display device comprising:
a liquid crystal display panel;
a backlight assembly providing light to the liquid crystal display panel and including an optical sheet comprising a first surface facing the liquid crystal display panel in a first direction and a projecting portion coupled to the first surface, the projecting portion being bent to face in a second direction, the projecting portion comprising:
an elongated part with a second surface facing in the second direction, and
bridges each coupled between the first surface and the elongated part; and
a bottom cover including a side surface facing in the second direction and supporting the liquid crystal display panel and the backlight assembly.

### Claim 9 (depends on 8)

The display device of claim 8, wherein each of the bridges has a width of less than 2 mm.

### Claim 10 (depends on 8)

The display device of claim 8, wherein the projecting portion further includes a fixing part coupled to the elongated part between the bridges.

### Claim 11 (depends on 10)

The display device of claim 10, further comprising a fixing unit coupled to an indented portion of the side surface of the bottom cover, the fixing part secured to the fixing unit.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the bottom cover includes a bottom surface facing the liquid crystal display panel in the first direction, the bottom surface having a first hole and a protrusion towards the second direction formed in the indented portion of the side surface.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the fixing unit includes (i) a first surface facing the bottom surface in the first direction (ii) a second surface and (iii) a third surface, the second surface and the third surface facing in the second direction, the third surface offset from the second surface in the second direction,
wherein the second surface is disposed at a first end of the first surface, and a second end of the first surface is bent towards the first direction and inserted into the first hole of the bottom surface, and
wherein the second surface has a second hole through which the protrusion of the bottom surface is inserted, and the second surface and the third surface together have a third hole at which the fixing part of the projecting portion is secured.

### Claim 14 (depends on 11)

The display device of claim 11, wherein the fixing unit has a line shape and includes an elastic material, and the fixing unit is bent to include a connecting part and a fastening part,
wherein the connecting part is coupled to a bottom surface of the bottom cover, the bottom surface facing the liquid crystal display panel in the first direction, and
wherein the fastening part corresponds to the side surface of the bottom cover and the fixing part is secured to the fastening part.

### Claim 15 (depends on 14)

The display device of claim 14, wherein the fastening part is divided into two pieces spaced apart from each other.

### Claim 16 (depends on 8)

The display device of claim 8, wherein the side surface has a hook, and the projecting portion includes a fixing hole combined with the hook.

### Claim 17 (depends on 16)

The display device of claim 16, wherein the projecting portion further includes a folding line along a direction parallel to a length of the fixing hole.