Liquid crystal device
AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Asaoka, Hideaki Takao, Takeshi Togano, Makoto Kojima
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Abstract
A liquid crystal device is constituted by a pair of substrates and a ferroelectric liquid crystal disposed between the substrates. At least one of the pair of substrates has thereon an alignment film of a polyimide having a recurring unit of the following formula (I): ##STR1## wherein R.sub.1 denotes a tetravalent organic residue; and X.sub.1 -X.sub.8 independently denote an alkyl group having 1-15 carbon atoms, an alkoxy group having 1-15 carbon atoms, CF.sub.3 group, halogen or hydrogen atom with the proviso that at least one of X.sub.1 -X.sub.4 is not hydrogen atom and at least one of X.sub.5 -X.sub.8 is not hydrogen atom.
Claims9
A liquid crystal device, comprising:
- a pair of substrates and a ferroelectric liquid crystal disposed between the substrates;
- at least one of said pair of substrates having thereon an alignment film comprising a polyimide having a recurring unit of the following formula (I):
- ##STR22## wherein R.sub.1 denotes a tetravalent organic residue;
- and X.sub.1 -X.sub.8 independently denote an alkyl group having 1-15 carbon atoms, an alkoxy group having 1-15 carbon atoms, CF.sub.3 group, halogen or hydrogen atom, with the proviso that at least one of X.sub.1 -X.sub.4 is not hydrogen atom, at least one of X.sub.5 -X.sub.8 is not hydrogen atom, and at least one of X.sub.2, X.sub.4, X.sub.5 and X.sub.7 is not hydrogen atom.
Dependencies are inferred from the claim text.