Liquid crystal compounds and materials and devices containing them.

摘要

A novel liquid crystal compound having the molecular structure <CHEM> where R is an alkyl group, which may contain up to 18 carbon atoms and which may be normal or branched and may contain a chiral centre, @ is a bicyclo (2,2,2) octane ring, @ is a phenyl ring and CN is a cyano group, n being an integer greater than 0, preferably 1 or 2, is used in an electro-optic device comprising a polariser (1) and a liquid-crystal cell (3) with liquid-crystal layer (6).