A liquid crystal device in which the liquid crystal material comprises or contains a compound having ferro- electric spontaneous polarisation properties, the compound being of the formula:
Where L is a liquid crystal residue or liquid crystal compatible material having a terminal cyclic structure directly connected to the asymmetric carbon centre C*, R1 is selected from C1-4-alkyl and halogen and R2 is selected from alkyl, alkoxy, alkylthio, halo-alkyl & -alkoxy, alkoxyalkyl, halogeno, alkyl-carbonyl & -carbonyloxy and alkoxy -carbonyl and -carbonyloxy.
一种液晶装置,其中的液晶材料包含或含有一种具有
铁电自发极化特性的化合物,该化合物的
化学式为
其中,L 是一种液晶残留物或液晶兼容材料,具有与不对称碳中心 C* 直接相连的末端环状结构;R1 选自 C1-4-烷基和卤素;R2 选自烷基、烷氧基、烷
硫基、卤代烷基和-烷氧基、烷氧基烷基、卤代烷基、烷基-羰基和-羰基氧基以及烷氧基-羰基和-羰基氧基。