Liquid crystal display and liquid crystal composition comprised thereof

Patent metadata

Field	Value
Publication number	US-10459292-B2
Application number	US-201715494038-A
Country	US
Kind code	B2
Filing date	Apr 21, 2017
Priority date	Aug 11, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A liquid crystal display includes a first substrate, a second substrate opposing the first substrate, an electrode portion provided on at least one of the first and second substrates, and a liquid crystal layer provided between the first substrate and the second substrate and including a liquid crystal composition. The liquid crystal composition includes a liquid crystal compound including a cyclohexenylene group, and provides the liquid crystal display with low rotary viscosity and high voltage holding ratio.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first substrate;
a second substrate opposing the first substrate;
an electrode portion provided on at least one of the first and second substrates; and
a liquid crystal layer provided between the first substrate and the second substrate and including a liquid crystal composition,
wherein the liquid crystal composition comprises at least one of liquid crystal compounds represented by the following Chemical Formula 1, at least one of liquid crystal compounds represented b the following Chemical Formula 2 and at least one of liquid crystal compounds represented by the following Chemical Formulae 5-4 to 5-8:

where Y is H or alkyl having 1 to 5 C atoms, the alkyl having 1 to 5 C atoms includes being not substituted or wherein one or more —CH 2 — groups each, independently of one another, is substituted by —C≡C—, —CF 2 O—, —O—, —CO—O—, —O—CO— or —O—CO—O so that O atoms are not directly linked to each other, 1 to 3 H atoms are substituted by halogen, or combination thereof,
A is 1,4-cyclohexylene or 1,4-phenylene,
Z 1 to Z 4 each, independently of one another, is H, F, Cl, or alkyl having 1 to 2 C atoms,
B is 1,4-cyclohexylene or 1,4-phenylene, wherein B is 1,4-phenylene when at least one of Z 1 to Z 4 is F or Cl,
n is 0 or 1,
Z is H, F, Cl, or alkyl having 1 to 2 C atoms, wherein Z is H when Y is H, and
X is F, Cl, or alkyl having 1 to 4 C atoms, the alkyl having 1 to 4 C atoms includes being not substituted or wherein one or more —CH 2 — groups each, independently of one another, is substituted by —C≡C—, —CF 2 O—, —O—, —CO—O—, —O—CO— or —O—CO—O— so that O atoms are not directly linked to each other, 1 to 3 H atoms are substituted by halogen, or combination thereof, and
R and R′ each, independently of one another, is alkyl or alkoxy having 1 to 4 C atoms,

where X′ is hydrogen, F, Cl, or alkyl having 1 to 15 C atoms, the alkyl having 1 to 15 C atoms includes being not substituted or wherein one or more —CH 2 — groups each, independently of one another, is substituted by —C≡C—, —CF 2 O—, —CH═CH—, —CO—, —O—, —CO—O—, —O—CO— or —O—CO—O— so that O atoms are not directly linked to each other, 1 to 3 H atoms are substituted by halogen, or combination thereof.

2. The liquid crystal display of claim 1 , wherein the liquid crystal compound of Chemical Formula 1 is present in an amount exceeding 0 wt % but less than 15 wt % based on a total weight of the liquid crystal composition.

3. The liquid crystal display of claim 1 , wherein the liquid crystal compound of Chemical Formula 1 includes at least one of liquid crystal compounds represented by the following Chemical Formula 1-1:

where Y, A, Z 1 to Z 4 , B, n, and Z are as defined in Chemical Formula 1, and R is alkyl or alkoxy having 1 to 4 C atoms.

4. The liquid crystal display of claim 3 , wherein the liquid crystal compound of Chemical Formula 1-1 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-1-1 to 1-1-5:

where Y, Z, and R are as defined in Chemical Formula 1-1.

5. The liquid crystal display of claim 1 , wherein the liquid crystal compound represented by Chemical Formula 1 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-2 and 1-3:

where Y is H, and A, Z 1 to Z 4 , B, n, and X are as defined in Chemical Formula 1, and

where Y, A, Z 1 to Z 4 , B, n, and X are as defined in Chemical Formula 1.

6. The liquid crystal display of claim 5 , wherein the liquid crystal compound of Chemical Formula 1-2 includes at least one of liquid crystal compounds represented by Chemical Formulae 1-2-1 and 1-2-2, and
the liquid crystal compound of Chemical Formula 1-3 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-3-1 and 1-3-2:

where Y is H, and A, Z 2 to Z 4 , B, n, and X are as defined in Chemical Formula 1,

where Y, A, Z 2 to Z 4 , B, n, and X are as defined in Chemical Formula 1.

7. The liquid crystal display of claim 5 , wherein the liquid crystal compound of Chemical Formula 1-2 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-2-4 and 1-2-5, and
the liquid crystal compound of Chemical Formula 1-3 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-3-4 and 1-3-5:

where A is as defined in Chemical Formula 1.

8. The liquid crystal display of claim 5 , wherein the liquid crystal compound of Chemical Formula 1-2 includes at least one of liquid crystal compounds represented by the following Chemical Formulae 1-2-6 to 1-2-11, and
the liquid crystal compound of Chemical Formula 1-3 includes at least one of liquid crystal compounds represented by Chemical Formulae 1-3-6 to 1-3-12:

9. The liquid crystal display of claim 1 , wherein the liquid crystal composition comprises at least one of liquid crystal compounds represented by the following Chemical Formula 3:

where A, n, R, R′ and X of Chemical Formula 3 is as defined in Chemical Formula 1 and Chemical Formula 2.

10. The liquid crystal display of claim 9 , wherein any combination of the liquid crystal compound of Chemical Formula 1 and at least one of the liquid crystal compound of Chemical Formula 2 and the liquid crystal compound of Chemical Formula 3, is present in an amount exceeding 0 wt % but less than 15 wt % based on a total weight of the liquid crystal composition.

11. The liquid crystal display of claim 1 , further comprising an alignment layer provided between the first substrate and the liquid crystal layer and between the second substrate and the liquid crystal layer,
wherein the alignment layer includes a polymer obtained by polymerizing a monomer represented by the following Chemical Formula 4:

where Rp and Rq each, independently of one another, is acrylate having 1 to 12 C atoms, methacrylate, an epoxy group, an oxetane group, a vinyl-ether group, or a styrene group,
L 1 to L 3 each, independently of one another, is a single bond, an alkyl group having 1 to 10 C atoms, ether, carbonyl, or carboxyl, and
o is 1 or 2.

12. The liquid crystal display of claim 11 , wherein the polymer obt

Assignees

• Samsung Display Co Ltd

Inventors

• Park Joon Hyung
• Park Kyung Hae
• Son Jong Ho
• Lee Jin Hyeong
• Jang Hye Lim

Classifications

• C09K19/3001

  Cyclohexane rings · CPC title

• C09K19/065 Primary

  containing one non-condensed unsaturated non-aromatic ring, e.g. cyclohexene ring · CPC title

• C09K2019/3004

  Cy-Cy · CPC title

• G02F1/00

  Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics · CPC title

• C09K2019/3027

  Compounds comprising 1,4-cyclohexylene and 2,3-difluoro-1,4-phenylene · CPC title