Liquid crystal display device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9719017-B2
Application number	US-201414765104-A
Country	US
Kind code	B2
Filing date	Jan 30, 2014
Priority date	Feb 6, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

There is provided a liquid crystal display device which enables reductions in image sticking and droplet stains caused in production thereof without degradation of properties such as dielectric anisotropy, viscosity, the upper limit of the temperature of nematic phase, and rotational viscosity (γ 1 ); and there is also provided a method for manufacturing such a liquid crystal display device. The liquid crystal display device is characterized in that a liquid crystal layer containing a liquid crystal composition is disposed between a substrate provided with a common electrode and a color filter layer and another substrate provided with a plurality of pixels each having a pixel electrode, each of the substrates is not provided with an alignment film but provided with an orientation controlling layer composed of at least two polymerizable compounds, each of the pixels has two or more regions having different directions of pretilt, and the liquid crystal composition contains a compound represented by General Formula (I) and a compound represented by General Formula (II).

First claim

The invention claimed is:

1. A liquid crystal display device in which a liquid crystal layer containing a liquid crystal composition is disposed between a first substrate provided with a common electrode and a color filter layer and a second substrate provided with a plurality of pixels each having a pixel electrode, the liquid crystal display device comprising:
orientation controlling layers formed of at least two polymerizable compounds and disposed between the first substrate and the liquid crystal layer and between the second substrate and the liquid crystal layer without the presence of an alignment film, wherein
each of the pixels has at least two regions having different directions of pretilt, and
the liquid crystal composition contains at least one compound represented by General Formula (I)

(where R 1α and R 2α each independently represent an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms; Q 1 represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group; l 1 represents 1 or 2; and in the case where l 1 is 2, the two Q 1 's may be the same as or different from each other) and a compound represented by General Formula (II)

(where R 3α represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms; R 4α represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 4 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyloxy group having 3 to 8 carbon atoms; Q 2 represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group; l 2 represents 0, 1, or 2; in the case where l 2 is 2, the two Q 2 's may be the same as or different from each other; and G 1 is a single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 —, —CF 2 O—, or —OCF 2 —),
wherein said at least two polymerizable compounds include a first polymerizable compound and a second polymerizable compound, the first polymerizable compound being at least one compound selected from the group consisting of compounds represented by General Formula (X1a), General Formula (X1b) and General Formula (X1c), and the second polymerizable compound being at least one compound selected from the group consisting of compounds represented by General Formula (X2a);

where A 1 represents a hydrogen atom or a methyl group;
A 2 represents a single bond or an alkylene group having 1 to 15 carbon atoms (one or more methylene groups contained in the alkylene group are each independently optionally substituted with an oxygen atom, —CO—, —COO—, or —OCO— such that oxygen atoms are not directly bonded to each other; and one or more hydrogen atoms contained in the alkylene group are each independently optionally substituted with a fluorine atom, a methyl group, or an ethyl group;
A 3 and A 6 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 to 18 carbon atoms (one or more methylene groups contained in the alkyl group are each independently optionally substituted with an oxygen atom, —CO—, —COO—, or —OCO— such that oxygen atoms are not directly bonded to each other; and one or more hydrogen atoms contained in the alkyl group are each independently optionally substituted with a halogen atom or an alkyl group having 1 to 17 carbon atoms);
A 4 and A 7 each independently represent a hydrogen atom, a halogen atom, or an alkyl group having 1 to 10 carbon atoms (one or more methylene groups contained in the alkyl group are each independently optionally substituted with an oxygen atom, —CO—, —COO—, or —OCO— such that oxygen atoms are not directly bonded to each other; and one or more hydrogen atoms contained in the alkyl group are each independently optionally substituted with a halogen atom or an alkyl group having 1 to 9 carbon atoms);
k is from 1 to 40;
B 1 , B 2 , and B 3 each independently represent a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms (one or more methylene groups contained in the alkyl group are each independently optionally substituted with an oxygen atom, —CO—, —COO—, or —OCO— such that oxygen atoms are not directly bonded to each other; and one or more hydrogen atoms contained in the alkyl group are each independently optionally substituted with a halogen atom or a trialkoxysilyl group having 3 to 6 carbon atoms), or a group represented by General Formula (I-b)

(where A 9 represents a hydrogen atom or a methyl group; and
A 8 represents a single bond or an alkylene group having 1 to 15 carbon atoms (one or more methylene groups contained in the alkylene group are each independently optionally substituted with an oxygen atom, —CO—, —COO—, or —OCO— such that oxygen atoms are not directly bonded to each other; and one or more hydrogen atoms contained in the alkylene group are each independently optionally substituted with a fluorine atom, a methyl group, or an ethyl group), where among B 1 , B 2 , and B 3 that are present in the number of 2k+1 in total, the number of the groups represented by General Formula (I-b) is 0 or 1),
compounds represented by General Formula (XIb)

(where R 7 represents a hydrogen atom or a methyl group;
six-membered rings T 1 , T 2 , and T 3 each independently represent any of the following structures

(where m is an integer from 1 to 4);
n 4 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 2 ═CHCH 2 CH 2 —, or —CH 2 CH 2 CH═CH—;
Y 3 represents a single bond, —COO—, or —OCO—; and
R 8 represents a hydrocarbon group having 1 to 18 carbon atoms), and compounds represented by General Formula (X1c)

(where R 70 represents a hydrogen atom or a methyl group, and
R 71 represents a hydrocarbon group having fused rings); and

(where R 3 and R 4 each independently represent a hydrogen atom or a methyl group;
C 4 and C 5 each independently represent a 1,4-phenylene group, a 1,4-cyclohexylene group, a pyridine-2,5-diyl group, a pyrimidine-2,5-diyl group, a pyridazine-3,6-diyl group, a 1,3-dioxane-2,5-diyl group, a cyclohexene-1,4-diyl group, a decahydronaphthalene-2,6-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, a phenanthrene-2,7-diyl group, an anthracene-2,6-diyl group, a 2,6-naphthylene group, or an indane-2,5-diyl group (among these groups, one or more hydrogen atoms of the 1,4-phenylene group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 2,6-naphthylene group, and indane-2,5-diyl group are each independently optionally substituted with a fluorine atom, a chlorine atom, a methyl group, a trifluoromethyl group, or a trifluoromethoxy group);
Z 3 and Z 5 each independently

Assignees

• Dainippon Ink & Chemicals

Inventors

• Kurisawa Kazuki
• Hayashi Masanao
• Ogawa Shinji

Classifications

• C08F230/08

  containing silicon · CPC title

• G02F1/133707

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title

• C09K19/3003

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

• C08F220/10

  Esters · CPC title

• G02F1/133514

  Colour filters · CPC title