Optical compensatory sheet comprising transparent support and optically anisotropic layer
AssigneeFuji Photo Film Co., Ltd.
InventorsEiichiro Aminaka, Hideyuki Nishikawa, Ken Kawata
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Abstract
An optical compensatory sheet comprises a transparent support and an optically anisotropic layer. The optically anisotropic layer is formed from liquid crystal molecules. Three principal refractive indices of the optically anisotropic layer are different from each other.
Claims14
An optical compensatory sheet comprising a transparent support and an optically anisotropic layer formed from liquid crystal molecules, wherein three principal refractive indices of the optically anisotropic layer satisfy the following formulas:
- n1>n2>n3,
- n1−n2>0.005, and
- n2−n3>0.005,
- wherein n1, n2 and n3 represent the three principal refractive indices of the optically anisotropic layer, and
- wherein an angle between a direction giving the smallest principal refractive index and a normal of the transparent support is less than ±4°.
A process for the preparation of an optical compensatory sheet, which comprises the steps in order of coating a transparent support with discotic liquid crystal molecules having a monovalent group as a substituent group of a discotic core, said monovalent group containing a benzene ring and a double bond conjugated with the benzene ring;
- aligning the discotic liquid crystal molecules at an average inclined angle of less than 5°;
- and exposing the layer to polarized light to form an optically anisotropic layer, wherein three principal refractive indices of the optically anisotropic layer satisfy the following formulae:
- n1>n2>n3,
- n1−n2>0.005, and
- n2−n3>0.005,
- wherein n1, n2 and n3 represent the three principal refractive indices of the optically anisotropic layer, and
- wherein an angle between a direction giving the smallest principal refractive index and a normal of the transparent support is less than ±4°.
Dependencies are inferred from the claim text.