Ferroelectric liquid crystal cell.

摘要

Orientation control films (4) are coated and rubbed on a pair of transparent substrates (2) on the side contiguous to the terroelectric liquid crystal layer (1) for aligning molecules threof. The film (4) is made of a polyimide Polymer prepared by ring closure by heating and dehydrating of a polyamic acid which is synthetized by condensing pyromelli- tie dianhydride with 4,4-diaminoterphenyl. A contrast ratio of the ferroelectric liquid crystal element is improved while keeping a high responsibility charactéristics of the férroelec- tric liquid crystal materials.