Liquid crystal display device and production method for liquid crystal display device

Patent metadata

Field	Value
Publication number	US-11168254-B2
Application number	US-201816498285-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Mar 28, 2017
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

The present invention is a liquid crystal display device including a liquid crystal layer containing a liquid crystal material, a sealing member surrounding the liquid crystal layer in a plan view, a pair of substrates sandwiching the liquid crystal layer, and an alignment control layer being in contact with the liquid crystal layer in a region surrounded by the sealing member in a plan view. The alignment control layer aligns a liquid crystal compound in the liquid crystal material in a direction horizontal to faces of the substrates, and contains a polymer formed by polymerization of at least one monomer, and the at least one monomer contains a monomer represented by the following Chemical formula (1):wherein at least one hydrogen atom of the phenylene group may be the same or different and may be substituted with a halogen atom, a methyl group, an ethyl group, or a propyl group.

First claim

The invention claimed is:

1. A liquid crystal display device comprising:
a liquid crystal layer containing a liquid crystal material;
a sealing member surrounding the liquid crystal layer in a plan view;
a pair of substrates sandwiching the liquid crystal layer; and
an alignment control layer being in contact with the liquid crystal layer in a region surrounded by the sealing member in a plan view,
the alignment control layer aligning a liquid crystal compound in the liquid crystal material in a direction horizontal to faces of the substrates, and containing a polymer formed by polymerization of at least one monomer, and
the at least one monomer including a monomer represented by Chemical formula (1):

wherein each of R1 individually represents a hydrogen atom, a halogen atom, a methyl group, an ethyl group, or a propyl group.

2. The liquid crystal display device according to claim 1 ,
wherein the liquid crystal material has positive anisotropy of dielectric constant.

3. The liquid crystal display device according to claim 1 ,
wherein the liquid crystal material contains at least one of a liquid crystal compound including a structure represented by Chemical formula (2) or a liquid crystal compound including a structure represented by Chemical formula (3):

wherein each of R2 individually represents a hydrogen atom or a halogen atom,

wherein each of R3 individually represents a hydrogen atom or a halogen atom.

4. The liquid crystal display device according to claim 3 ,
wherein the liquid crystal compound including the structure represented by Chemical formula (2) is a compound represented by any one of Chemical formulas (2-1) to (2-4), and
the liquid crystal compound including the structure represented by Chemical formula (3) is a compound represented by any one of Chemical formulas (3-1) to (3-4):

wherein R 0 is a saturated alkyl group containing 1 to 12 carbon atoms,

wherein R 0 is a saturated alkyl group containing 1 to 12 carbon atoms.

5. The liquid crystal display device according to claim 1 ,
wherein the liquid crystal material contains a liquid crystal compound containing an alkenyl group.

6. The liquid crystal display device according to claim 5 ,
wherein the liquid crystal compound containing an alkenyl group is a compound represented by any one of Chemical formulas (4-1) to (4-4):

wherein m and n are the same as or different from each other, and each represent an integer of 1 to 6.

7. The liquid crystal display device according to claim 1 , comprising an alignment film that is provided between the alignment control layer and at least one of the pair of substrates and contains polyimide.

8. The liquid crystal display device according to claim 1 , being in a transverse electric field display mode.

9. A production method for a liquid crystal display device, comprising:
sealing a liquid crystal composition containing a liquid crystal material and at least one monomer between a pair of substrates bonded to each other by a sealing member to form a liquid crystal layer; and
irradiating the liquid crystal layer with a polarized ultraviolet ray to form an alignment control layer by polymerization of the at least one monomer between the liquid crystal layer and each of the pair of substrates,
the at least one monomer including a monomer represented by Chemical formula (1), and
the alignment control layer aligning a liquid crystal compound in the liquid crystal material in a direction horizontal to faces of the substrates:

wherein each of R1 individually represents a hydrogen atom, a halogen atom, a methyl group, an ethyl group, or a propyl group.

10. The production method for a liquid crystal display device according to claim 9 ,
wherein the liquid crystal material has positive anisotropy of dielectric constant.

11. The production method for a liquid crystal display device according to claim 9 , further comprising forming an alignment film containing polyimide on at least one of the pair of substrates.

12. The production method for a liquid crystal display device according to claim 9 ,
wherein in the forming of the alignment control layer, the polarized ultraviolet ray is applied while the liquid crystal layer is heated at a temperature of a nematic phase-isotropic phase transition point of the liquid crystal material or higher, and 140° C. or lower.

Assignees

• Sharp Kk

Inventors

• Mizusaki Masanobu
• Itoh Tomonori

Classifications

• C09K2323/02

  Alignment layer characterised by chemical composition · CPC title

• C09K19/3003 Primary

  Compounds containing at least two rings in which the different rings are directly linked (covalent bond) · CPC title

• C09K2019/3422

  the heterocyclic ring being a six-membered ring · CPC title

• C09K2019/3004

  Cy-Cy · CPC title

• G02F1/1339

  Gaskets; Spacers; Sealing of cells · CPC title