A liquid crystal display device has a liquid crystal display panel including pixels each having an active device, a pixel electrode, a common electrode and a liquid crystal layer arranged in a dot matrix array. The liquid crystal display panel has a first substrate, a second substrate, and a liquid crystal layer provided between the first substrate and the second substrate. The first substrate has the active device, the pixel electrode, the common electrode and a first alignment film. The second substrate has a second alignment film. The first alignment film and the second alignment film are respectively a photo alignment film formed by irradiating a photo decomposition type insulating film with light. The second alignment film has a thickness of at least 10 nm and no greater 50 nm and is thinner than the first alignment film.

Liquid crystal display device and manufacturing method thereof

In a liquid crystal display element of the present invention, the aligning capability for imparting pre-tilt angles to a liquid crystal material is imparted only to the surface of the alignment film of one of the substrates, the material layer having dielectric anisotropy includes a chiral material and a liquid crystal material with a nematic liquid crystal phase, 0.25≦d/p≦0.50 is satisfied assuming that the thickness of the material layer having the dielectric anisotropy is d and the chiral pitch length of the liquid crystal material is p, and 1000×d/p≦Δn×d is satisfied assuming that the refractive index anisotropy of the liquid crystal material is Δn.

Liquid crystal display element

Disclosed is a liquid crystal alignment agent which contains a polyamic acid ester having a repeating unit, and having an end modified such that an amino group on the end has a specific structure. The liquid crystal alignment agent is characterised in containing: a polyamic acid ester having a repeating unit represented by general formula (1), and having an end modified such that an amino group on the end has a specific structure represented by general formula (2); and an organic solvent. (In general formula (1), X1 represents a tetravalent organic group, Y1 represents a divalent organic group, R1 represents a C1-5 alkyl group, and A1 and A2 independently represent a C1-10 alkyl group, alkenyl group, or alkynyl group which can have a hydrogen atom or a substituent.) (In general formula (2), A represents a single bond, -O-, -S-, or -NR3-, R1 and R2 independently represent a C1-30 organic group, and R2 and R3 can bond to form a ring structure. A3 represents a hydrogen atom or an optionally substituted C1-10 alkyl group, alkenyl group or alkynyl group.)

Liquid crystal alignment agent containing end-modified polyamic acid ester, and liquid crystal alignment film

Provided is a composition, particularly a liquid crystal aligning agent, that can form a high-quality polyimide film having uniform characteristics, particularly a liquid crystal alignment film, using a low thermal treatment temperature. Said composition is characterized by including: a polyimide precursor obtained by reacting a diamine component including one or more types selected from a group comprising an unsubstituted meta-Phenylenediamine and a substituted meta-Phenylenediamine with a tetracarboxylic acid dianhydride component; and/or a polyimide obtained by imidizing the polyimide precursor; and a cyclic ketone solvent that dissolves the polyimide precursor and/or the polyimide. (In formula [1], X is a substituted group and n is an integer between 0 and 4.)

Composition, liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element

The present disclosure is directed toward solutions, transparent films prepared from aromatic copolyamides, and a display element, an optical element or an illumination element using the solutions and/or the films. The copolyamides, which contain pendant carboxylic groups are solution cast into films using cresol, xylene, N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), dimethylsulfoxide (DMSO), or butyl cellosolve or other solvents or mixed solvent which has more than two solvents. When the films are thermally cured at temperatures near the copolymer glass transition temperature, after curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant.

Solution of aromatic polyamide for producing display element, optical element, or illumination element

Provided is a liquid crystal aligning agent that can increase adhesiveness between a sealing agent and a liquid crystal alignment film, and can suppress display anomalies that may occur under high temperature and high humidity conditions in liquid crystal display elements near the frame The liquid crystal alignment agent contains a component (A), a component (B), and an organic solvent Component (A): at least one polymer selected from the group consisting of a polyimide precursor having a structural unit represented by formula (1), and an imidized polymer of said polyimide precursor Component (B): a compound having a hydroxyalkylamide group (X1 independently represents a tetravalent organic group; Y1 represents a divalent organic group; R1 represents a hydrogen atom or a C1-5 alkyl group; and A1 and A2 independently represent a hydrogen atom, a C1-10 alkyl group, a C2-10 alkenyl group, or a C2-10 alkynyl group, and said groups may have a substituent)

Liquid crystal aligning agent, and liquid crystal display element using same

Disclosed is a liquid crystal alignment agent characterised by containing component (A) and component (B). Component (A): a polyamic acid ester which has a repeating group represented by general formula (1), and which fulfils the condition below. Component (B): a polyamic acid which has a repeating group represented by general formula (4). (Condition): In general formula (1), at least one among X 1 , Y 1 , A 1 , A 2 has a substituent of at least one structure selected from a group comprising general formula (2) and general formula (3). (In general formula (1), X 1 represents a tetravalent organic group, Y 1 represents a divalent organic group, R 1 represents a C1-5 alkyl group, A 1 and A 2 independently represent a hydrogen atom or an optionally substituted C1-20 alkyl group or alkenyl group.) (In general formulae (2, 3), D 1 and D 2 independently represent a protective group which is replaced by hydrogen by heat. B 1 represents a single bond or a divalent organic group. In general formula (3), the ester group is bound to a carbon atom.) (In general formula (4), X 2 represents a tetravalent organic group, Y 2 represents a divalent organic group, and A 1 and A 2 have the same definition as in general formula (1).)

Liquid crystal alignment agent containing polyamic acid ester, and liquid crystal alignment film

Disclosed is a polyimide precursor composition containing a polyamic ester, which provides a polyimide film having a high imidization ratio and excellent adhesion to an inorganic substrate, and has good storage stability. The polyimide precursor composition containing a polyamic ester, a thermal imidization accelerator, and a solvent, wherein the thermal imidization accelerator is a compound which has a carboxyl group and an amino group or an imino group showing basicity by thermal deprotection and does not accelerate imidization of a polyamic ester before removing a protecting group. Further, the polyimide precursor composition containing a silane-coupling agent.

Polyimide precursor composition containing polyamic acid alkyl ester

Disclosed is a liquid crystal alignment agent which can reduce microscopic irregularities on the surface of liquid crystal alignment films, improves liquid crystal alignment properties, and has improved electrical characteristics of every kind. The liquid crystal alignment agent contains component (A), component (B) and component (C), wherein component (A) is a polyamic acid ester obtained from a tetracarboxylic acid dialkyl ester derivative containing a tetracarboxylic acid dialkyl ester derivative represented by general formula (1) as at least 60 mol% of the total tetracarboxylic acid dialkyl ester derivative, and a diamine containing at least one diamine selected from the diamines represented by general formulae (2-5), the component (B) is a polyamic acid obtained from a tetracarboxylic acid dianhydride, and a diamine, and the component (C) is a mixed solvent containing at least one type of organic solvent (C1) selected from a group comprising -butyrolactone and derivatives thereof, and at least one type of organic solvent (C2) selected from a group comprising N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and derivatives thereof, and in which the content of the organic solvent (C2) is 2%-30% by mass relative to the total amount of both organic solvents (C1, C2). In general formula (1), R1 is a C1-5 alkyl group, and R2 is a hydroxyl group or a chlorine atom.) (In general formulae (2-5), A1 is a single bond, an ester bond, an amide bond, thioester bond, or a C2-10 divalent organic group, A2 is a halogen atom, a hydroxyl group, an amino group, a thiol group, a nitro group, a phospate group, or a C1-20 monovalent organic group, a is an integer from 1-4, and when a is 2 or higher, the structure of A2 can be the same or different.

Polyamic acid ester liquid crystal alignment agent, and liquid crystal alignment film using same

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