# US 10,371,988 B2 · Curved liquid crystal display

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- Number: US 10,371,988 B2
- Document ID: US10371988B2
- Status: Granted
- Kind: B2
- Application number: 15/839,755
- Filed: 2017-12-12
- Published: 2018-04-12
- Granted: 2019-08-06
- Earliest claimed: 2014-12-10
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Dong Han Song; Oh Jeong Kwon; Su Jin Kim; Jin Won Kim; Ki Chul Shin; Dong Chul Shin; Sung Jae Yun; Hyeok Jin Lee
- Web page: https://patentgrep.com/patent/US10371988B2

## CPC

- G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes}
- G02F 1/133723: {Polyimide, polyamide-imide}
- G02F 1/133337: {Layers preventing ion diffusion, e.g. by ion absorption}
- G02F 1/133397: {for suppressing after-image or image-sticking}
- G02F 1/133773: {the alignment material or treatment being different for the two opposite substrates}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- 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 curved liquid crystal display including a first curved substrate; a second curved substrate; a liquid crystal layer including liquid crystal molecules having negative dielectric anisotropy, the liquid crystal layer being interposed between the first and second curved substrates; a first curved liquid crystal alignment layer interposed between the liquid crystal layer and the first curved substrate; and a second curved liquid crystal alignment layer interposed between the liquid crystal layer and the second curved substrate. The second curved liquid crystal alignment layer has an average value of surface roughness values greater than an average value of surface roughness values of the first curved liquid crystal alignment layer.

## Claims

### Claim 1

A curved liquid crystal display comprising:
a first curved substrate;
a second curved substrate;
a liquid crystal layer comprising liquid crystal molecules having negative dielectric anisotropy, the liquid crystal layer being interposed between the first curved substrate and the second curved substrate;
a first curved liquid crystal alignment layer interposed between the liquid crystal layer and the first curved substrate; and
a second curved liquid crystal alignment layer which has an average value of surface roughness values greater than an average value of surface roughness values of the first curved liquid crystal alignment layer, the second curved liquid crystal alignment layer being interposed between the liquid crystal layer and the second curved substrate,
wherein each of the first and second curved liquid crystal alignment layers comprises protrusions resulting from a light polymerization reaction of reactive mesogens in various sizes such that an average number of the protrusions protruded from one side of the second curved liquid crystal alignment layer is greater than an average number of the protrusions protruded from one side of the first curved liquid crystal alignment layer.

### Claim 2 (depends on 1)

The curved liquid crystal display of claim 1, further comprising:
a patternless electrode interposed between the first curved substrate and the first curved liquid crystal alignment layer; and
a patterned electrode interposed between the second curved liquid crystal alignment layer and the second curved substrate, the patterned electrode comprising a slit pattern.

### Claim 3 (depends on 1)

The curved liquid crystal display of claim 1, wherein a number of the polymerized reactive mesogens in the second curved liquid crystal alignment layer is greater than a number of the polymerized reactive mesogens in the first curved liquid crystal alignment layer.

### Claim 4 (depends on 1)

The curved liquid crystal display of claim 1, wherein the liquid crystal molecules having negative dielectric anisotropy comprise a first liquid crystal molecule and a second liquid crystal molecule having a pre-tilt angle smaller than a pre-tilt angle of the first liquid crystal molecule.

### Claim 5 (depends on 1)

The curved liquid crystal display of claim 1, wherein a difference (mθ1-mθ2) between an average value (mθ1,) of the pre-tilt angle (θ1) of the first liquid crystal molecule and an average value (mθ2) of the pre-tilt angle (θ2) of the second liquid crystal molecule ranges from 0.5° to 1.5°.