LCD device

Patent metadata

Field	Value
Publication number	US-10133109-B2
Application number	US-201515118678-A
Country	US
Kind code	B2
Filing date	Feb 12, 2015
Priority date	Feb 14, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

Provided is an LCD device having excellent high speed responsiveness. This LCD device contains a polymer or a copolymer in a liquid crystal composition sandwiched between two transparent substrates, at least one of which has an electrode, and the content of the polymer or the copolymer is 1% by mass or greater and less than 40% by mass of the total mass of the liquid crystal composition and the polymer or the copolymer. This LCD device can be applied to various operation modes such as TN, STN, ECB, VA, VA-TN, IPS, FFS, a π cell, OCB, and cholesteric liquid crystals.

First claim

The invention claimed is:

1. An LCD device, comprising:
a liquid crystal composition sandwiched between two transparent substrates, at least one of which has an electrode attached thereto,
wherein the liquid crystal composition contains a polymer or a copolymer in an amount of 1% by mass or greater and less than 40% by mass with respect to the total mass of the liquid crystal composition and the polymer or the copolymer,
wherein the liquid crystal composition is represented by the following Formula (LC):

wherein R LC represents an alkyl group having 1 to 15 carbon atoms, one or two or more CH 2 groups in the alkyl group may be substituted with —O—, —CH═CH—, —CO—, —OCO—, —COO—, or —C≡C— as long as an oxygen atom is not directly adjacent to another oxygen atom, and one or two or more hydrogen atoms in the alkyl group may be arbitrarily substituted with a halogen atom;
A LC1 and A LC2 each independently represent a group selected from the group consisting of the following groups (a), (b), and (c),
(a) a trans-1,4-cyclohexylene group, provided that one CH 2 group or two or more non-adjacent CH 2 groups present in this group may be substituted with an oxygen atom or a sulfur atom,
(b) a 1,4-phenylene group, provided that one CH group or two or more non-adjacent CH groups present in this group may be substituted with a nitrogen atom,
(c) a 1,4-bicyclo(2.2.2)octylene group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, or a chroman-2,6-diyl group, and
one or two or more hydrogen atoms included in the group (a), (b), or (c) each may be substituted with a fluorine atom, a chlorine atom, —CF 3 , or —OCF 3 ;
Z LC represents a single bond, —CH═CH—, —CF═CF—, —C≡C—, —CH 2 CH 2 —, —(CH 2 ) 4 —, —OCH 2 —, —CH 2 O—, —OCF 2 —, —CF 2 O—, —COO—, or —OCO—;
Y LC represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, or an alkyl group having 1 to 15 carbon atoms, and one or two or more CH 2 groups in the alkyl group may be substituted with —O—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF 2 O—, or —OCF 2 — as long as an oxygen atom is not directly adjacent to another oxygen atom, and one or two or more hydrogen atoms in the alkyl group may be arbitrarily substituted by a halogen atom; and
a represents an integer of 1 to 4, and when a represents 2, 3, or 4 and a plurality of A LC1 's and a plurality of Z LC 's are present in Formula (LC), the plurality of A LC1 's may be the same as or different from each other and the plurality of Z LC 's may be the same as or different from each other,
wherein the liquid crystal composition contains a polymer or a copolymer in an amount of 1% by mass or greater and less than 40% by mass with respect to the total mass of the liquid crystal composition and the polymer or the copolymer, and
wherein the polymer or the copolymer is obtained by polymerizing at least one polymerizable compound which is selected from the group consisting of the following compounds (A)-(C):
(A) a compound represented by each of the following Formulas (V) and (VI):

wherein X 1 and X 2 each independently represent a hydrogen atom or a methyl group, Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 12 carbon atoms, or —O—(CH 2 ) s — where s represents an integer of 1 to 11 and the oxygen atom is bonded to an aromatic ring, U represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms, the alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom as long as an oxygen atom is not adjacent to another oxygen atom, may be substituted with an alkyl group having 5 to 20 carbon atoms and the alkylene group in the alkyl group may be substituted with an oxygen atom as long as an oxygen atom is not adjacent to another oxygen atom, or may be substituted with a cyclic substituent, k represents an integer of 1 to 5, and an arbitrary hydrogen atom in all 1,4-phenylene groups in the formula may be substituted with —CH 3 , —OCH 3 , a fluorine atom, or a cyano group;

wherein X 3 represents a hydrogen atom or a methyl group, Sp 3 represents a single bond, an alkylene group having 1 to 12 carbon atoms, or —O—(CH 2 ) t — where t represents an integer of 2 to 11, and the oxygen atom is bonded to an aromatic ring, V represents a linear or branched polyvalent alkylene group having 2 to 20 carbon atoms or a polyvalent cyclic substituent having 5 to 30 carbon atoms, the alkylene group in the polyvalent alkylene group may be substituted with an oxygen atom as long as an oxygen atom is not adjacent to another oxygen atom, may be substituted with an alkyl group having 5 to 20 carbon atoms and the alkylene group in the alkyl group may be substituted with an oxygen atom as long as an oxygen atom is not adjacent to another oxygen atom, or may be substituted with a cyclic substituent, W represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 15 carbon atoms, and an arbitrary hydrogen atom in all 1,4-phenylene groups in the formula may be substituted with —CH 3 , —OCH 3 , a fluorine atom, or a cyano group;
(B) a compounds represented by the following Formula (X1b):

wherein A 8 represents a hydrogen atom or a methyl group, six-membered rings T 1 , T 2 , and T 3 each independently represent any one of the following formulas in which q represents an integer of 1 to 4,

q represents 0 or 1,
Y 1 and Y 2 each independently represent a single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C≡C—, —CH═CH—, —CF═CF—, —(CH 2 ) 4 —, —CH 2 CH 2 CH 2 O—, —OCH 2 CH 2 CH 2 —, —CH═CHCH 2 CH 2 —, or —CH 2 CH 2 CH═CH—,
Y 3 and Y 4 each independently represent a single bond or an alkylene group having 1 to 12 carbon atoms, provided that one or two or more methylene groups in the alkylene group each may be independently substituted with an oxygen atom, —CO—, —COO—, or —OCO— as long as an oxygen atom is not directly bonded to another oxygen atom and one or two or more hydrogen atoms in the alkylene group each may be independently substituted with a fluorine atom, a methyl group, or an ethyl group, and
B 8 represents a hydrogen atom, a cyano group, a halogen atom, an alkyl group having 1 to 8 carbon atoms, or an alkylene group in which the terminal has an acryloyl group or a methacryloyl group; and
(C) a compound represented by the following Formula (Vb):

wherein X 1 and X 2 each independently represent a hydrogen atom or a methyl group, Sp 1 and Sp 2 each independently represent a single bond, an alkylene group having 1 to 12 carbon atoms, or —O—(CH 2 ) s — where s represents an integer of 1 to 11 and the oxygen atom is bonded to an aromatic ring, Z 1 represents —OCH 2 —, —CH 2 O—, —COO—, —OCO—, —CF 2 O—, —OCF 2 —, —CH 2 CH 2 —, —CF 2 CF 2 —, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH 2 CH 2 —, —OCO—CH 2 CH 2 —, —CH 2 CH 2 —COO—, —CH 2 CH 2 —OCO—, —COO—CH 2 —, —OCO—CH 2 —, —CH 2 —COO—, —CH 2 —OCO—, —CY 1 ═CY 2 — where Y 1 and Y 2 each independently represent a hydrogen ato

Assignees

• Dainippon Ink & Chemicals
• Dic Corp Tokyo

Inventors

• Fujisawa Toru
• Sudo Go
• Yamamoto Shuuhei
• Maruyama Kazunori
• Takatsu Haruyoshi
• GOTO Marina
• Kodera Fumiaki
• JANG Keumhee

Classifications

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title

• G02F1/1334 Primary

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• C09K19/544 Primary

  as dispersing or encapsulating medium around the liquid crystal · CPC title

• C09K19/322

  Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring · CPC title

• C09K19/3066

  in which the rings are linked by a chain containing carbon and oxygen atoms, e.g. esters or ethers · CPC title