Liquid crystal composition, liquid crystal display device using the liquid crystal composition, and method of manufacturing the liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10754199-B2
Application number	US-201815961462-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Oct 25, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A liquid crystal composition, a liquid crystal display (LCD) device using the liquid crystal composition, and a method of manufacturing an LCD device are provided. The liquid crystal display device comprises: a first substrate; a liquid crystal layer disposed on the first substrate, the liquid crystal layer including a liquid crystal compound; and a first liquid crystal alignment layer disposed between the first substrate and the liquid crystal layer, wherein the first compound includes a first compound, which has at least one hydrophilic group bonded to one end of a core structure thereof and a benzoyl derivative moiety bonded to the other end of the core structure thereof.

First claim

What is claimed is:

1. A liquid crystal display (LCD) device comprising:
a first substrate;
a liquid crystal layer disposed on the first substrate, the liquid crystal layer including a liquid crystal compound; and
a first liquid crystal alignment layer disposed between the first substrate and the liquid crystal layer,
wherein the liquid crystal compound includes a first compound, which has at least one hydrophilic group bonded to one end of a core structure thereof and a benzoyl derivative moiety bonded to the other end of the core structure thereof, and
the core structure of the first compound includes a mesogenic skeleton, and
the benzoyl derivative moiety of the first compound is represented by any one of Formulas Ia through Ie:

where
R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 are each independently hydrogen, a hydroxyl group, a C 1-5 alkyl group or a C 1-5 alkoxy group,
R 21 and R 22 are each independently hydrogen, a hydroxyl group, a C 1-5 alkyl group or a C 1-5 alkoxy or phenyl group,
R 31 is a straight or branched C 1-5 alkylene group,
R 32 is hydrogen or a hydroxyl group, and
X is absent, or is oxygen, sulfur, or a carbonyl group, and * is a bonding site.

2. The LCD device of claim 1 , wherein the first liquid crystal alignment layer further includes,
a polymer of a second compound, the second compound has at least one hydrophilic group bonded to one end of a core structure thereof and a polymerizable group bonded to the other end of the core structure thereof, wherein the hydrophilic group of the second compound is the same as or different from the hydrophilic group of the first compound, or
a polymer of a third compound, the third compound has polymerizable groups bonded to both ends of a core structure thereof, wherein the polymerizable groups of the third compound is the same as or different from the polymerizable group of the second compound, and the core structure of the third compound is the same as or different from the core structure of the second compound.

3. The LCD device of claim 2 , wherein the polymerizable group of the second compound and the polymerizable groups of the third compounds are each independently acryloyl groups, methacryloyl groups, acrylate groups, or methacrylate groups.

4. The LCD device of claim 2 , wherein the first liquid crystal alignment layer further includes,
a fourth compound, the fourth compound has at least one hydrophilic group bonded to one end of a core structure thereof, wherein the hydrophilic group and the core structure of the fourth compound are the same as or different from the hydrophilic group and the core structure of the second compound, and an aliphatic or aromatic hydrocarbon moiety is bonded to the other end of the core structure thereof.

5. The LCD device of claim 4 , wherein
the first compound, the second compound, and the fourth compound are aligned such that the hydrophilic groups thereof are oriented toward the first substrate, and
liquid crystals are induced by the first liquid crystal alignment layer to be vertically aligned.

6. The LCD device of claim 1 , further comprising:
electrodes disposed between the first substrate and the first liquid crystal alignment layer,
wherein the first liquid crystal alignment layer is in contact with the electrodes and the liquid crystal layer.

7. The LCD device of claim 1 , wherein the liquid crystal layer further includes at least one of:
a second compound, the second compound having at least one hydrophilic group bonded to one end of a core structure thereof and a polymerizable group bonded to the other end of the core structure thereof,
a third compound, the third compound having polymerizable groups bonded to both ends of a core structure thereof, and
a fourth compound, the fourth compound having at least one hydrophilic group bonded to one end of a core structure thereof and an aliphatic or aromatic hydrocarbon moiety bonded to the other end of the core structure thereof.

8. The LCD device of claim 1 , further comprising:
a second substrate disposed on the liquid crystal layer; and
a second liquid crystal alignment layer disposed between the liquid crystal layer and the second substrate,
wherein the second liquid crystal alignment layer includes:
the first compound;
a polymer of a second compound or a third compound, the second compound having at least one hydrophilic group bonded to one end of a core structure thereof and a polymerizable group bonded to the other end of the core structure thereof, the third compound having polymerizable groups bonded to both ends of a core structure thereof, and
a fourth compound, the fourth compound having at least one hydrophilic group bonded to one end of a core structure thereof and an aliphatic or aromatic hydrocarbon moiety bonded to the other end of the core structure thereof.

9. The LCD device of claim 8 , wherein
a surface of the first substrate that faces the second substrate has a concave curved surface, and
the surface roughness of the first liquid crystal alignment layer is greater than the surface roughness of the second liquid crystal alignment layer.

10. A method of manufacturing an LCD device, the method comprising:
preparing first and second substrates; and
forming a liquid crystal layer between the first and second substrates by providing a liquid crystal composition including liquid crystal and a first compound, the first compound has at least one hydrophilic group bonded to one end of a core structure thereof and a benzoyl derivative moiety bonded to the other end of the core structure thereof, and
the core structure of the first compound includes a mesogenic skeleton, and
the benzoyl derivative moiety of the first compound is represented by any one of Formulas Ia through Ie:

where
R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 are each independently hydrogen, a hydroxyl group, a C 1-5 alkyl group or a C 1-5 alkoxy group,
R 21 and R 22 are each independently hydrogen, a hydroxyl group, a C 1-5 alkyl group or a C 1-5 alkoxy or phenyl group,
R 31 is a straight or branched C 1-5 alkylene group,
R 32 is hydrogen or a hydroxyl group, and
X is absent, or is oxygen, sulfur, or a carbonyl group, and * is a bonding site.

11. The method of claim 10 , wherein the liquid crystal composition further includes,
a second compound, the second compound has at least one hydrophilic group bonded to one end of a core structure thereof and a polymerizable group bonded to the other end of the core structure thereof,
a third compound, the third compound has polymerizable groups bonded to both ends of a core structure thereof, and
a fourth compound, the fourth compound has at least one hydrophilic group bonded to one end of a core structure thereof and an aliphatic or aromatic hydrocarbon moiety bonded to the other end of the core structure thereof.

12. The method of claim 11 , wherein the providing of the liquid crystal composition comprises placing the liquid crystal composition in contact with electrodes exposed on the first or second substrate.

13. The method of claim 11 , wherein the forming the liquid crystal layer, comprises: forming a first alignment layer by aligning at least some of the first, second, and fourth compounds such that the hydrophilic groups thereof are oriented toward the first substrate; and forming a second al

Assignees

• Samsung Display Co Ltd

Inventors

• Park Heung Shik
• Kim Kyeong Jong
• Shin Ki Chul

Classifications

• G02F1/1337 Primary

  Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers · CPC title

• C09K19/56 Primary

  Aligning agents · CPC title

• C09K19/062 Primary

  containing one non-condensed benzene ring · CPC title

• C09K2019/3425

  Six-membered ring with oxygen(s) in fused, bridged or spiro ring systems · CPC title

• G02F1/133514

  Colour filters · CPC title