| abstract |
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:n 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*, R 1 is selected from C 1-4 -alkyl and halogen and R 2 is selected from alkyl, alkoxy, alkylthio, halo-alkyl & -alkoxy, alkoxyalkyl, halogeno, alkyl-carbonyl & -carbonyloxy and alkoxy -carbonyl and -carbonyloxy. |