US 2015/0029451 A1Published application

Liquid crystal display device and method for producing the same

AssigneeDIC Corporation

InventorsShinji Ogawa, Yoshinori Iwashita, Takeshi Kuriyama

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Abstract

Provided are a liquid crystal display device that suppresses occurrence of drop marks during production without degrading various properties, such as dielectric anisotropy, viscosity, nematic phase upper limit temperature, rotational viscosity (γ1), and ghosting property, and a method for producing the liquid crystal display device. A liquid crystal display device 10 of the present invention includes a liquid crystal composition layer 13 sandwiched between a first substrate 11 and a second substrate 12 and vertical alignment films 16 and 17 that contain a polymer of a polymerizable compound having a reactive group. The liquid crystal composition constituting the liquid crystal composition layer 13 contains compounds represented by general formulae (I) and (II).

Claims12

Dependent claims

A liquid crystal display device comprising a first substrate that includes a common electrode, a second substrate that includes a pixel electrode, and a liquid crystal composition layer sandwiched between the first substrate and the second substrate, in which liquid crystal molecules in the liquid crystal composition layer are controlled by applying charges between the common electrode and the pixel electrode substantially vertically to the first substrate and the second substrate,

wherein the liquid crystal display device includes a vertical alignment film on at least one of the first substrate and the second substrate so that an alignment direction of the liquid crystal molecules in the liquid crystal composition layer is controlled to be substantially vertical to the surfaces of the first substrate and the second substrate that are adjacent to the liquid crystal composition layer, the vertical alignment film contains a polymer of a polymerizable compound having a reactive group, and a liquid crystal composition constituting the liquid crystal composition layer contains a compound represented by general formula (I)
(In the formula, R1 and R2 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;
A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group;
l represents 1 or 2;
and when l is 2, the two A may be the same or different from each other) and a compound represented by general formula (II)
(In the formula, R3 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;
R4 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;
B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group;
m represents 0, 1, or 2;
and when m is 2, the two B may be the same or different from each other).

7 more elements

A method for producing a liquid crystal display device, the method comprising applying an alignment material to at least one of a first substrate including a common electrode and a second substrate including a pixel electrode, the alignment material containing a polymerizable compound having a reactive group and a vertical alignment material;

heating the applied alignment material to form an alignment film;
sandwiching a liquid crystal composition between the first substrate and the second substrate;
and irradiating the alignment film with an active energy ray while applying a voltage between the common electrode and the pixel electrode to polymerize the polymerizable compound in the alignment film,
wherein the liquid crystal composition contains a compound represented by general formula (I)
(In the formula, R1 and R2 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;
A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group;
l represents 1 or 2;
and when l is 2, the two A may be the same or different from each other) and a compound represented by general formula (II)
(In the formula, R3 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;
R4 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;
B represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group;
m represents 0, 1, or 2;
and when m is 2, the two B may be the same or different from each other).

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/114,773Filed 5 Sep 2012
Priority: JP 2012-08306930 Mar 2012
Published: 29 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

G02F 1/133711
Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers: by organic films, e.g. polymeric films
C09K 19/44
Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40: containing compounds with benzene rings…
G02F 1/133788
By treatment of the surface, e.g. embossing, rubbing or light irradiation: by light irradiation, e.g. linearly polarised light photo-polymerisation
C09K 2019/0448
Characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group: the…