# US 2010/0165280 A1 · Liquid crystal display device

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- Number: US 2010/0165280 A1
- Document ID: US20100165280A1
- Status: Published application
- Kind: A1
- Application number: 12/640,161
- Filed: 2009-12-17
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Tetsuji ISHITANI; Daisuke KUBOTA; Takeshi NISHI
- Web page: https://patentgrep.com/patent/US20100165280A1

## CPC

- G02F 1/13718: {based on a change of the texture state of a cholesteric liquid crystal}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/045: using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
- G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing}
- G02F 1/13775: {Polymer-stabilized liquid crystal layers}
- 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
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

## Abstract

It is an object to provide a liquid crystal display device using a liquid crystal material exhibiting a blue phase which enables higher contrast. In the liquid crystal display device including a liquid crystal layer exhibiting a blue phase, the liquid crystal layer exhibiting a blue phase is interposed between a pixel electrode layer having an opening pattern and a common electrode layer having an opening pattern (a slit). An electric field is applied between the pixel electrode layer and the common electrode layer which have opening patterns and are provided so that a liquid crystal is interposed therebetween, whereby an oblique (oblique to a substrate) electric field is applied to the liquid crystal. Thus, liquid crystal molecules can be controlled by the electric field.

## Claims

### Claim 1

A liquid crystal display device comprising:
a first substrate and a second substrate between which a liquid crystal layer including a liquid crystal material exhibiting a blue phase is interposed;
a pixel electrode layer having an opening pattern, which is provided between the first substrate and the liquid crystal layer; and
a common electrode layer having an opening pattern, which is provided between the second substrate and the liquid crystal layer.

### Claim 2 (depends on 1)

A liquid crystal display device according to claim 1, wherein the pixel electrode layer is in contact with the liquid crystal layer, and the common electrode layer is in contact with the liquid crystal layer.

### Claim 3 (depends on 1)

A liquid crystal display device according to claim 1, wherein the pixel electrode layer and the common electrode layer each have a comb shape.

### Claim 4 (depends on 1)

A liquid crystal display device according to claim 1, wherein the liquid crystal layer includes a chiral agent.

### Claim 5 (depends on 1)

A liquid crystal display device according to claim 1, wherein the liquid crystal layer includes a photocurable resin and a photopolymerization initiator.

### Claim 6 (depends on 1)

A liquid crystal display device according to claim 1,
wherein a thin film transistor is provided between the first substrate and the pixel electrode layer, and
wherein the pixel electrode layer is electrically connected to the thin film transistor.

### Claim 7 (depends on 6)

A liquid crystal display device according to claim 6, wherein the thin film transistor includes an oxide semiconductor layer.

### Claim 8 (depends on 7)

A liquid crystal display device according to claim 7, wherein the oxide semiconductor layer contains at least one of indium, zinc, and gallium.

### Claim 9 (depends on 6)

A liquid crystal display device according to claim 6, wherein a light-transmitting chromatic color resin layer is provided between the thin film transistor and the pixel electrode layer.

### Claim 10 (depends on 1)

A liquid crystal display device according to claim 1, wherein the liquid crystal display device is incorporated into one selected from the group consisting of a television set, a digital photo frame, a portable amusement machine, a slot machine, and a cellular phone

### Claim 11

A liquid crystal display device comprising:
a first substrate and a second substrate between which a liquid crystal layer including a liquid crystal material exhibiting a blue phase is interposed;
a pixel electrode layer having an opening pattern, which is provided between the first substrate and the liquid crystal layer; and
a common electrode layer having an opening pattern, which partially overlaps with the pixel electrode layer and is provided between the second substrate and the liquid crystal layer.

### Claim 12 (depends on 11)

A liquid crystal display device according to claim 11, wherein the pixel electrode layer is in contact with the liquid crystal layer, and the common electrode layer is in contact with the liquid crystal layer.

### Claim 13 (depends on 11)

A liquid crystal display device according to claim 11, wherein the pixel electrode layer and the common electrode layer each have a comb shape.

### Claim 14 (depends on 11)

A liquid crystal display device according to claim 11, wherein the liquid crystal layer includes a chiral agent.

### Claim 15 (depends on 11)

A liquid crystal display device according to claim 11, wherein the liquid crystal layer includes a photocurable resin and a photopolymerization initiator.

### Claim 16 (depends on 11)

A liquid crystal display device according to claim 11,
wherein a thin film transistor is provided between the first substrate and the pixel electrode layer, and
wherein the pixel electrode layer is electrically connected to the thin film transistor.

### Claim 17 (depends on 16)

A liquid crystal display device according to claim 16, wherein the thin film transistor includes an oxide semiconductor layer.

### Claim 18 (depends on 17)

A liquid crystal display device according to claim 17, wherein the oxide semiconductor layer contains at least one of indium, zinc, and gallium.

### Claim 19 (depends on 16)

A liquid crystal display device according to claim 16, wherein a light-transmitting chromatic color resin layer is provided between the thin film transistor and the pixel electrode layer.

### Claim 20 (depends on 11)

A liquid crystal display device according to claim 11, wherein the liquid crystal display device is incorporated into one selected from the group consisting of a television set, a digital photo frame, a portable amusement machine, a slot machine, and a cellular phone