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

Patent metadata

Field	Value
Publication number	US-11675233-B2
Application number	US-201816498274-A
Country	US
Kind code	B2
Filing date	Mar 22, 2018
Priority date	Mar 28, 2017
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

The present, invention provides a liquid crystal display device that can exhibit excellent retardation stability against heat and that can prevent reduction in contrast ratio due to scattering even when the liquid crystal display device includes a retardation layer formed by polymerization of a reactive monomer, and a method for producing a liquid crystal display device suitable for production of the liquid crystal display device. The liquid crystal display device of the present invention includes paired substrates and a liquid crystal layer provided between the paired substrates. At least one of the paired substrates includes a retardation layer formed from a polymer of at least one type of monomer. The at least one type of monomer includes a photo-aligning monomer that is to be aligned by polarized light.

First claim

The invention claimed is:

1. A liquid crystal display device comprising:
paired substrates; and
a liquid crystal layer provided between the paired substrates,
at least one of the paired substrates including a retardation layer formed from a polymer of at least one type of monomer,
the at least one type of monomer including a photo-aligning monomer that is to be aligned by polarized light,
wherein the photo-aligning monomer is represented by the following formula (I-1), (I-2), (I-3), (I-4), (I-5), (I-6), (I-7), (I-8), (I-9), (I-10), (I-11), or (I-12):

2. The liquid crystal display device according to claim 1 , further comprising, between at least one of the paired substrates and the liquid crystal layer, a photo-alignment film that controls alignment of liquid crystal molecules in the liquid crystal layer.

3. The liquid crystal display device according to claim 2 ,
wherein the photo-alignment film has a structure derived from a cyclobutane ring.

4. The liquid crystal display device according to claim 2 ,
wherein the photo-alignment film contains a cinnamate group.

5. A method for producing a liquid crystal display device according to claim 1 that includes a liquid crystal layer and a substrate including a retardation layer, the method comprising:
forming a film containing at least one type of monomer, the at least one type of monomer including a photo-aligning monomer represented by the following formula (I-1), (I-2), (I-3), (I-4), or (I-12):

and
irradiating the film with polarized light to polymerize and align the monomer to form the retardation layer.

6. The method for producing a liquid crystal display device according to claim 5 , further comprising
rubbing a surface of the retardation layer to allow the retardation layer to exhibit an alignment regulating force on liquid crystal molecules in the liquid crystal layer.

7. The method for producing a liquid crystal display device according to claim 5 , further comprising:
forming a polymer film containing a cinnamate group on the retardation layer; and
irradiating the polymer film with polarized light to allow the polymer film to exhibit an alignment regulating force on liquid crystal molecules in the liquid crystal layer.

8. The method for producing a liquid crystal display device according to claim 5 , further comprising:
forming a polymer film containing a cyclobutane ring on the retardation layer; and
irradiating the polymer film with polarized light to allow the polymer film to exhibit an alignment regulating force on liquid crystal molecules in the liquid crystal layer.

Assignees

• Sharp Kk

Inventors

• Mizusaki Masanobu
• Kawahira Yuichi

Classifications

• C08F22/38

  Amides · CPC title

• G02F1/133635

  Multifunctional compensators · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• G02F1/133715

  by first depositing a monomer · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title