A ferroelectric liquid crystal electro-optical device comprises a pair of plates having driving electrodes and ferroelectric liquid crystal material having a negative dielectric anisotropy. The ferroelectric liquid crystal material comprises a ferroelectric liquid crystal composition 10 to 80% by weight of a compound of the general formula: <IMAGE> wherein R1 represents a straight-chain alkyl or alkoxy group, or an alkyl, alkoxy, alkoxyalkyl or acyloxy group each having an asymmetric carbon atom, and R2 represents a straight-chain alkyl group having an assymmetric carbon.
Ferro-electric liquid crystal electrol-optical device