# US 10,120,208 B2 · Optical film, backlight module and liquid crystal display device

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- Number: US 10,120,208 B2
- Document ID: US10120208B2
- Status: Granted
- Kind: B2
- Application number: 14/769,093
- Filed: 2015-03-13
- Published: 2017-08-10
- Granted: 2018-11-06
- Earliest claimed: 2014-10-29
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Yongda Ma; Yongchun Lu
- Web page: https://patentgrep.com/patent/US10120208B2

## CPC

- G02F 1/009: {Thermal properties}
- G02B 7/008: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation}
- G02F 1/1335: Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F 1/1336: {Illuminating devices}
- G02F 1/133628: {with cooling means}
- 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

The present disclosure discloses an optical film, a backlight module and a liquid crystal display device and relates to the liquid crystal display field. It solves the problem that the edge of an optical film in the prior art can be easily warped. An optical film is provided and comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body.

## Claims

### Claim 1

A liquid crystal display device, wherein the liquid crystal display device comprises a optical film, the optical film comprising an optical film body,
wherein at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body, and
wherein the thermal expansion stretchable structure comprises a plurality of slots with different lengths, and at least one of the plurality of slots extends into a visible area of the liquid crystal display device.

### Claim 2 (depends on 1)

The liquid crystal display device according to claim 1, wherein the heat expansion stretchable structure comprises a through hole arranged in the optical film body.

### Claim 3 (depends on 2)

The liquid crystal display device according to claim 2 wherein the through hole is in a regular or irregular shape.

### Claim 4 (depends on 3)

The liquid crystal display device according to claim 3, wherein the through hole is in an inverted trapezoidal, a rectangular or a circular shape.

### Claim 5 (depends on 2)

The liquid crystal display device according to claim 2, wherein the through hole is in an inverted trapezoidal, a rectangular or a circular shape.

### Claim 6 (depends on 1)

The liquid crystal display device according to claim 1, wherein the heat expansion stretchable structure comprises a notch arranged in the optical film body.

### Claim 7 (depends on 6)

The liquid crystal display device according to claim 6, wherein the notch comprises one or more slots.