# US 2019/0171052 A1 · Liquid crystal display panel and liquid crystal display device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0171052 A1
- Document ID: US20190171052A1
- Status: Published application
- Kind: A1
- Application number: 16/321,330
- Filed: 2017-07-28
- Published: 2019-06-06
- Earliest claimed: 2016-07-28
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: MASAHIRO HASEGAWA; KOJI MURATA; YUICHI KAWAHIRA; TAKAKO KOIDE; KOZO NAKAMURA; AKIRA SAKAI; KIYOSHI MINOURA
- Web page: https://patentgrep.com/patent/US20190171052A1

## CPC

- G02F 1/13363: Birefringent elements, e.g. for optical compensation
- G02F 1/133502: {Antiglare, refractive index matching layers}
- G02F 1/133528: {Polarisers}
- G02F 1/133634: {the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis}
- G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F 1/133711: {by organic films, e.g. polymeric films}
- G02F 1/13394: {spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 takes precedence)}
- G02F 1/133337: {Layers preventing ion diffusion, e.g. by ion absorption}
- G02F 1/133541: {Circular polarisers}
- G02F 1/133565: {inside the LC elements, i.e. between the cell substrates}
- G02F 1/133633: {using mesogenic materials}
- G02F 1/133638: {Waveplates, i.e. plates with a retardation value of lambda/n}
- G02F 1/133738: {for homogeneous alignment}
- G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]}
- G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned}
- G02F 2201/50: Protective arrangements
- G02F 2202/22: Antistatic materials or arrangements
- G02F 2202/28: Adhesive materials or arrangements
- G02F 2413/01: Number of plates being 1
- G02F 2413/02: Number of plates being 2
- G02F 2413/05: Single plate on one side of the LC cell
- G02F 2413/06: Two plates on one side of the LC cell
- G02F 2413/08: with a particular optical axis orientation
- G02F 2413/13: Positive birefingence
- G02F 2413/14: Negative birefingence
- 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 liquid crystal display panel of the present invention includes, sequentially from the viewer side: a first linearly polarizing plate; a first λ/4-wavelength layer; a first substrate including a color filter, a black matrix, and a second λ/4-wavelength layer; a liquid crystal layer; a second substrate; and a second linearly polarizing plate, the liquid crystal display panel further including a sealing material disposed so as to surround the liquid crystal layer in a plan view, wherein the second λ/4-wavelength layer is disposed closer to the liquid crystal layer than the color filter and the black matrix are and such that an outer edge of the second λ/4-wavelength layer lies inside an arrangement region of the sealing material, and the first λ/4-wavelength layer and the second λ/4-wavelength layer are disposed such that their slow axes are perpendicular to each other.

## Claims

### Claim 1

A liquid crystal display panel comprising, sequentially from the viewer side:
a first linearly polarizing plate;
a first λ/4-wavelength layer;
a first substrate including a color filter, a black matrix, and a second λ/4-wavelength layer;
a liquid crystal layer;
a second substrate; and
a second linearly polarizing plate,
the liquid crystal display panel further comprising a sealing material disposed so as to surround the liquid crystal layer in a plan view,
wherein the second λ/4-wavelength layer is disposed closer to the liquid crystal layer than the color filter and the black matrix are and such that an outer edge of the second λ/4-wavelength layer lies inside an arrangement region of the sealing material, and
the first λ/4-wavelength layer and the second λ/4-wavelength layer are disposed such that their slow axes are perpendicular to each other.

### Claim 2 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein the second λ/4-wavelength layer is a stack of an alignment layer and a liquid crystalline polymer.

### Claim 3 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein the first λ/4-wavelength layer and the second λ/4-wavelength layer are positive A plates.

### Claim 4 (depends on 3)

The liquid crystal display panel according to claim 3,
further comprising a positive C plate between the first λ/4-wavelength layer and the first substrate.

### Claim 5 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein one of the first λ/4-wavelength layer or the second λ/4-wavelength layer is a positive A plate and the other is a negative A plate.

### Claim 6 (depends on 1)

The liquid crystal display panel according to claim 1,
further comprising an antireflection film on the first linearly polarizing plate, on the side opposite to the first λ/4-wavelength layer.

### Claim 7 (depends on 1)

The liquid crystal display panel according to claim 1,
further comprising a shield electrode on the first substrate, on the side opposite to the liquid crystal layer.

### Claim 8 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein the liquid crystal display panel operates in a transverse electric field mode.

### Claim 9 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein an alignment azimuth of liquid crystal molecules in the liquid crystal layer in a no-voltage applied state is parallel or perpendicular to a transmission axis of the first linearly polarizing plate or a transmission axis of the second linearly polarizing plate.

### Claim 10 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein the transmission axis of the first linearly polarizing plate and a slow axis of the first λ/4-wavelength layer form an angle of 40° to 50° therebetween.

### Claim 11 (depends on 1)

The liquid crystal display panel according to claim 1,
further comprising an alignment film between the second λ/4-wavelength layer and the liquid crystal layer to cover at least the second λ/4-wavelength layer.

### Claim 12 (depends on 1)

The liquid crystal display panel according to claim 1,
further comprising a dielectric layer between the second λ/4-wavelength layer and the liquid crystal layer to cover at least the second λ/4-wavelength layer.

### Claim 13 (depends on 1)

The liquid crystal display panel according to claim 1,
wherein the first substrate comprises an adhesive layer between the second 2A-wavelength layer and the color filter.

### Claim 14 (depends on 1)

A liquid crystal display device comprising:
the liquid crystal display panel according to claim 1; and
a backlight unit adjacent to the second linearly polarizing plate of the liquid crystal display panel.