# US 11,307,463 B2 · Liquid crystal display panel and method for manufacturing the same

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- Number: US 11,307,463 B2
- Document ID: US11307463B2
- Status: Granted
- Kind: B2
- Application number: 16/833,469
- Filed: 2020-03-27
- Published: 2020-10-01
- Granted: 2022-04-19
- Earliest claimed: 2019-03-29
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Koji Murata; Kiyoshi Minoura; Akira Sakai; Yuichi Kawahira; Kohzoh Nakamura
- Web page: https://patentgrep.com/patent/US11307463B2

## CPC

- G02F 1/133788: {by light irradiation, e.g. linearly polarised light photo-polymerisation}
- G02F 1/137: characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]}
- G02F 1/1362: Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)}
- G02F 1/133738: {for homogeneous alignment}
- G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned}
- G02F 1/136222: {Colour filters incorporated in the active matrix substrate}
- 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

## Abstract

The liquid crystal display panel includes a first substrate, a second substrate, and a liquid crystal layer provided between the first substrate and the second substrate. The first substrate includes a first dielectric substrate, a first electrode and a second electrode provided on the first dielectric substrate and capable of generating a horizontal electric field in the liquid crystal layer, and a first alignment film being in contact with the liquid crystal layer. The second substrate includes a second dielectric substrate and a second alignment film provided on the second dielectric substrate and being in contact with the liquid crystal layer. The first alignment film has an azimuthal anchoring strength lower than the second alignment film. The liquid crystal layer includes a nematic liquid crystal material and a polymer network.

## Claims

### Claim 1

A liquid crystal display panel comprising a first substrate, a second substrate, and a liquid crystal layer provided between the first substrate and the second substrate, wherein:
the first substrate includes a first dielectric substrate, a first electrode and a second electrode being provided on the first dielectric substrate, a first alignment film being in contact with the liquid crystal layer, a horizontal electric field being generated in the liquid crystal layer between the first electrode and the second electrode;
the second substrate includes a second dielectric substrate and a second alignment film provided on the second dielectric substrate, the second alignment film being in contact with the liquid crystal layer;
an azimuthal anchoring strength of the first alignment film is lower than an azimuthal anchoring strength of the second alignment film; and
the liquid crystal layer includes a nematic liquid crystal material and a polymer network, wherein
the polymer network anchors liquid crystal molecules in a first liquid crystal region in the liquid crystal layer, which is adjacent to the first alignment film, with an azimuthal anchoring strength that is lower than an azimuthal anchoring strength of liquid crystal molecules in a second liquid crystal region in the liquid crystal layer, the liquid crystal modules in a second liquid crystal region being adjacent to the second alignment film,
the polymer network anchors liquid crystal molecules in a third liquid crystal region provided between the first liquid crystal region and the second liquid crystal region, with an azimuthal anchoring strength, which is lower than the azimuthal anchoring strength of the liquid crystal molecules in the second liquid crystal region and is higher than the azimuthal anchoring strength of the liquid crystal molecules in the first liquid crystal region, and
the polymer network is not in contact with the first alignment film.

### Claim 2 (depends on 1)

The liquid crystal display panel according to claim 1, wherein the azimuthal anchoring strength of the first alignment film is 1×10−7 J/m2 or more and 1×10−5 J/m2 or less.

### Claim 3 (depends on 1)

The liquid crystal display panel according to claim 1, wherein the azimuthal anchoring strength of the second alignment film is 1×10−4 J/m2 or more and 1×10−3 J/m2 or less.

### Claim 4 (depends on 1)

The liquid crystal display panel according to claim 1, wherein the polymer network has a higher density in the second liquid crystal region than in the first liquid crystal region.

### Claim 5 (depends on 1)

The liquid crystal display panel according to claim 1, wherein the polymer network has a mass fraction of 1% or more and 3% or less for the entire liquid crystal layer.

### Claim 6 (depends on 1)

The liquid crystal display panel according to claim 1, wherein the second liquid crystal region has a thickness of 5 nm or more and 500 nm or less.

### Claim 7 (depends on 1)

The liquid crystal display panel according to claim 1, wherein:
the first substrate includes a thin-film transistor being connected to either the first electrode or the second electrode and a color filter layer provided on the thin-film transistor; and
the first electrode and the second electrode are provided on the color filter layer.

### Claim 8 (depends on 1)

The liquid crystal display panel according to claim 1, the liquid crystal display panel comprising an FFS mode.

### Claim 9 (depends on 1)

A method for manufacturing the liquid crystal display panel according to claim 1, the method comprising:
preparing the first substrate and the second substrate;
preparing a liquid crystal composition material containing the nematic liquid crystal material and a photocurable resin;
forming a layer of the liquid crystal composition material between the first substrate and the second substrate; and
forming the polymer network, after forming the layer of liquid crystal composition material, by irradiating the liquid crystal composition material with light through the second substrate to cure the photocurable resin.