# US 8,570,463 B2 · Liquid crystal display device

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- Number: US 8,570,463 B2
- Document ID: US8570463B2
- Status: Granted
- Kind: B2
- Application number: 12/953,030
- Filed: 2010-11-23
- Published: 2011-06-16
- Granted: 2013-10-29
- Earliest claimed: 2009-12-16
- Assignees: LG Display Co., Ltd.
- Applicants: Seung-Ho Park; Chul Nam; Hyong-Jong Choi
- Inventors: Seung-Ho Park; Chul Nam; Hyong-Jong Choi
- Web page: https://patentgrep.com/patent/US8570463B2

## CPC

- G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal}
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- C09K 2323/033: Silicon compound, e.g. glass or organosilicon
- C09K 2323/035: Ester polymer, e.g. polycarbonate, polyacrylate or polyester
- G02F 1/133541: {Circular polarisers}
- G02F 1/133543: {Cholesteric polarisers}
- 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
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A liquid crystal display device includes: a liquid crystal panel; a first polarizing film and a second polarizing film on a bottom surface and a top surface, respectively, of the liquid crystal panel; a backlight unit below the first polarizing film; and a titanium oxide film on the second polarizing film and that transmits one of right-handed circularly polarized light and left-handed circularly polarized light and reflects the other, with a predetermined wavelength, of the right-handed circularly polarized light and the left-handed circularly polarized light.

## Claims

### Claim 1

A liquid crystal display device, comprising:
a liquid crystal panel;
a first polarizing film and a second polarizing film on a bottom surface and a top surface, respectively, of the liquid crystal panel;
a backlight unit below the first polarizing film; and
a titanium oxide film directly formed on the second polarizing film and that transmits one of right-handed circularly polarized light and left-handed circularly polarized light and reflects the other, with a predetermined wavelength, of the right-handed circularly polarized light and the left-handed circularly polarized light.

### Claim 2

A liquid crystal display device, comprising:
a liquid crystal panel;
a first polarizing film and a second polarizing film on a bottom surface and a top surface, respectively, of the liquid crystal panel;
a backlight unit below the first polarizing film;
a titanium oxide film on the second polarizing film and that transmits one of right-handed circularly polarized light and left-handed circularly polarized light and reflects the other, with a predetermined wavelength, of the right-handed circularly polarized light and the left-handed circularly polarized light; and
a phase retardation film between the second polarizing film and the titanium oxide film and that changes linearly polarized light into the one of the right handed circularly polarized light and the left-handed circularly polarized light which the titanium oxide film transmits,
wherein the phase retardation film is directly formed on the second polarizing film.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the titanium oxide film has a helical structure through oblique deposition.

### Claim 4 (depends on 3)

The device according to claim 3, wherein the predetermined wavelength is determined by a helical pitch and a thickness of the titanium oxide film.

### Claim 5 (depends on 2)

The device according to claim 2, wherein the liquid crystal panel includes:
a first substrate and a second substrate facing each other;
a thin film transistor on the first substrate;
a pixel electrode on the first substrate and connected to the thin film transistor;
a common electrode on one of the first and second substrates; and
a liquid crystal layer between the first and second substrates.

### Claim 6 (depends on 2)

The device according to claim 2, further comprising a protection substrate on the titanium oxide film.

### Claim 7 (depends on 2)

The device according to claim 2, wherein the first polarizing film has a first polarizing axis, and the second polarizing film has a second polarizing axis perpendicular to the first polarizing axis.