Viewing angle compensator for liquid crystal display

Claim 1

a method for diminishing the viewing angle dependency of a liquid crystal display comprising: (a) providing a viewing angle compensator comprising a light transmitting substrate and a film of a liquid crystalline polyester, said liquid crystalline polyester comprising structural units (A), (B) and, optionally, (C) which are represented by the following general formulae, said liquid crystalline polyester exhibiting a homeotropic orientation in the liquid crystal state, having a structure wherein the refractive index in the thickness direction is larger than the refractive index in at least one of the other directions located in the plane of the polymer and assuming a glassy state at a temperature lower than the liquid crystal transition point of the polymer: ##STR26## where X represents at least one structural unit selected from the group consisting of: ##STR27## where Q represents a mere bond, ##STR28## (B) --O--Y--O-- 1-60 mol % where Y represents a divalent aliphatic group having 3 to 12 carbon atoms, containing at least one asymmetric carbon atom (C) --O--Z--O 0-59 mol % where Z represents a straight-chain or branched, divalent aliphatic group having 2 to 18 carbon atoms; and (B) positioning said compensator and a liquid crystal display cell between upper and lower polarizing plates, the combination of the compensator, the cell, and the upper and lower polarizing plates constituting the liquid crystal display.

Claim 2

a method for diminishing the viewing angle dependency of a liquid crystal display comprising: (a) providing a viewing angle compensator comprising a light transmitting substrate and a film of a liquid crystalline polyester, said liquid crystalline polyester comprising structural units (A), (B) and, optionally, (C) which are represented by the following general formulae, said liquid crystalline polyester exhibiting a homeotropic orientation in the liquid crystal state, having a structure wherein the refractive index in the thickness direction is larger than the refractive index in at least one of the other directions located in the plane of the polymer and assuming a glassy state at a temperature lower than the liquid crystal transition point of the polymer: ##STR26## where X represents at least one structural unit selected from the group consisting of: ##STR27## where Q represents a mere bond, ##STR28## (B) --O--Y--O-- 1-60 mol % where Y represents a divalent aliphatic group having 3 to 12 carbon atoms, containing at least one asymmetric carbon atom (C) --O--Z--O 0-59 mol % where Z represents a straight-chain or branched, divalent aliphatic group having 2 to 18 carbon atoms; and (B) positioning said compensator and a liquid crystal display cell between upper and lower polarizing plates, the combination of the compensator, the cell, and the upper and lower polarizing plates constituting the liquid crystal display.