Liquid crystal mixtures having widened smectic temperature range
申请人:Polaroid Corporation Patent Department
公开号:US04857227A1
公开(公告)日:1989-08-15
Mixtures of liquid crystal compounds from among different classes of liquid crystal ester compounds are disclosed. The mixtures exhibit freezing points substantially lower than the freezing point of either ester compound alone, so as to provide a substantially improved (widened) smectic C mesomorphic temperature range and protection against freezing or crystallization of liquid crystal material over a range of temperatures at which an electrooptic display device would typically be operated.
Liquid crystal compounds having fluorine-containing core
申请人:POLAROID CORPORATION
公开号:EP0256303A2
公开(公告)日:1988-02-24
Liquid crystal compounds exhibiting ferroelectric behavior and favorable spontaneous polarization values are disclosed and have the formula
wherein Ar is p-phenylene or p,p'-biphenylene; L is a linking group selected from -CH2-, -0-,
n is an integer one or two; each of Z and Z' is alkyl, alkoxy, alkoxyalkyl or an optically active group containing an asymmetric center; at least one of Z and Z' being said optically active group containing an asymmetric center. Compounds exhibiting the chiral smectic C phase are particularly suited to application in a ferroelectric display device.
本发明公开了具有铁电行为和良好自发极化值的液晶化合物,其化学式为
其中 Ar 是对亚苯基或 p,p'-联苯;L 是选自-CH2-、-0-和-CH2-的连接基团、
n是一个或两个整数;Z和Z'中的每一个都是烷基、烷氧基、烷氧基烷基或含有不对称中心的光学活性基团;Z和Z'中至少有一个是上述含有不对称中心的光学活性基团。表现出手性 Smectic C 相的化合物特别适合应用于铁电显示设备。