Ferroelectric liquid crystal mixtures and displays using same.

摘要

Electro-optical display devices having a cell thickness of 1 to 10 mu m, and containing ferroelectric liquid crystalline mixture, electrodes, alignment layer(s), in which the ferroelectric liquid crystalline mixture has a spontaneous polarization of Ps > 20 nC.cm<-><2> and a natural helical pitch of less than a half of the cell thickness, and contains lipophilizing, lipophilic or amphiphilic compounds for eliminating ionic impurities. Ferroelectric liquid crystal compositions according to the invention show a significantly reduced surface memory effect and an improved display contrast.