Liquid crystal display device
First Claim
1. A liquid crystal display device comprising:
- a liquid crystal cell and at least one compensation film or a combination of polarizers and optical compensators comprising at least one compensation film, said compensation film comprising at least one layer of an anisotropic polymer obtained by polymerization of polymerizable mesogenic material comprising a) two or more mesogenic compounds having at least one rod-like or board-like mesogenic group and and at least one polymerizable functional group, in the presence of b) an initiator, c) optionally a non-mesogenic compound having two or more polymerizable functional groups, and d) optionally a stabilizer, wherein said layer of an anistropic polymer has a homeotropic or tilted homeotropic molecular orientation, wherein said mesogenic compounds having at least one rod-like or board-like mesogen and at least one polymerizable functional group are compounds of formula I
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Abstract
The invention relates to a liquid crystal display device comprising a liquid crystal cell and at least one compensation film or a combination of polarizer and optical compensators comprising at least one compensation film, said compensation film comprising at least one layer of an isotropic polymer obtainable by polymerization of a mixture of a polymerizable mesogenic material comprising:
a) compound having one or two more polymerizable functional group, in the presences
b) an initiator,
c) optionally a non-polymerizable compound having two or more polymerizable functional groups and
d) optionally a stabilizer,
characterized in that said layer of an anisotropic polymer has a hometropic or tilted hometropic molecular orientation. The invention also relates to methods of manufacturing said compensation films. The invention further relates to mixtures of chiral polymerizable mesogenic material used for manufacturing of said compensation films.
72 Citations
35 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal cell and at least one compensation film or a combination of polarizers and optical compensators comprising at least one compensation film, said compensation film comprising at least one layer of an anisotropic polymer obtained by polymerization of polymerizable mesogenic material comprising a) two or more mesogenic compounds having at least one rod-like or board-like mesogenic group and and at least one polymerizable functional group, in the presence of b) an initiator, c) optionally a non-mesogenic compound having two or more polymerizable functional groups, and d) optionally a stabilizer, wherein said layer of an anistropic polymer has a homeotropic or tilted homeotropic molecular orientation, wherein said mesogenic compounds having at least one rod-like or board-like mesogen and at least one polymerizable functional group are compounds of formula I - View Dependent Claims (2, 3, 4, 5, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 29, 33)
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6. A compensation film comprising at least one layer of an anisotropic polymer with homeotropic or tilted homeotropic molecular orientation,
wherein said compensation film is obtained by A) coating a mixture of a polymerizable mesogenic material comprising a) two or more mesogenic compounds having at least one rod-like or board-like mesogenic group and at least one polymerizable functional group, b) an initiator, c) optionally a non-mesogenic compound having two or more polymerizable functional groups, and d) optionally a stabilizer - on at least one substrate in the form of a layer,
B) aligning said mixture in a homeotropic or tilted homeotropic orientation, C) polymerizing said mixture by exposing it to heat or actinic radiation, D) optionally repeating the steps A), B) and C) at least one more time, and E) optionally removing said at least one substrate from the polymerized material, wherein said mesogenic compounds having at least one rod-like or board-like mesogen and at least one polymerizable functional group are compounds of formula I - View Dependent Claims (7, 8, 9, 10, 11, 12, 14, 25, 26, 27, 28, 30, 34)
- on at least one substrate in the form of a layer,
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13. A mixture of a polymerizable mesogenic material comprising
a) 75 to 99% by weight of two or more achiral mesogenic compounds having at least one rod-like or board-like mesogen and one polymerizable functional group in the presence of b) 0.01 to 5% by weight of an initiator, c) 0 to 20% by weight of a non-mesogenic compound having two or more polymerizable functional groups, and d) 0 to 1000 ppm of a stabilizer, wherein said two or more achiral mesogenic compound having at least one rod-like or board-like mesogen and one polymerizable functional group are compounds of formula I
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32. A mixture of a polymerizable mesogenic material comprising
a) at least two mesogenic compounds each having at least one rod-like or board-like mesogen, wherein one of said mesogenic compounds has one polymerizable functional group and another of said mesogenic compounds has two or more polymerizable functional groups, b) 0.01 to 5% by weight of an initiator, c) 0 to 20% by weight of a non-mesogenic compound having two or more polymerizable functional groups, and d) 0 to 1000 ppm of a stabilizer, - wherein said at least two mesogenic compound are compounds of formula I
Specification