Patent ID: RE41281

Claim:
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 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 anisotropic 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 P—(Sp—X) n —MG—R I wherein P is a polymerizable group, Sp is a spacer group having 1 to 20 C atoms, X is a group selected from —O—, —S—, —CO—, —COO—, —OCO—, —OCOO— or a single bond, n is 1, MG is a group according to formula II —(A 1 —Z 1 ) m —A 2 —Z 2 —A 3 — II wherein A 1 , A 2 and A 3 are independently from each other: 1,4-phenylene or 1,4-phenylene in which one or more CH groups is replaced by N, 1,4-cyclohexylene or 1,4-cyclohexylene in which one or two non-adjacent CH 2 groups is replaced in each case by O or S, 1,4-cyclohexenylene, or naphthalene-2,6-diyl, wherein in each case the group is unsubstituted, or mono- or polysubstituted with halogen, cyano, nitro, alkyl having 1 to 7 C atoms, alkoxy having 1 to 7 C atoms, alkanoyl having 1 to 7 C atoms, alkyl having 1 to 7 C atoms wherein one or more H atoms is replaced by F or Cl, alkoxy having 1 to 7 C atoms wherein one or more H atoms is replaced by F or Cl, or alkanoyl having 1 to 7 C atoms wherein one or more H atoms is replaced by F or Cl, Z 1 and Z 2 are each independently —COO—, —OCO—, —CH 2 CH 2 —, —OCH 2 —, —CH 2 O—, —CH═CH, —C≡C —CH═CH—, —C≡C— , —CH═CH—COO—, —OCO—CH═CH— or a single bond, m is 0, 1 or 2, and R is alkyl having up to 25 C atoms, alkyl having up to 25 C atoms which is mono- or polysubstituted by halogen or CN, wherein, in each case, one or more non-adjacent CH 2 groups is optionally replaced, in each case independently from one another, by —O—, —S—, —NH—, —N(CH 3 )—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S— or —C≡C— in such a manner that oxygen atoms are not linked directly to one another, or alternatively R is halogen, cyano or has independently one of the meanings given for P—(Sp—X) n —, wherein said polymerizable mesogenic material contains at least 75% by weight of compounds of formula I.