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AssigneeHoechst Aktiengesellschaft
InventorsTakamasa Harada, Claus Escher, Gerd Illian, Anke Kaltbeitzel, Norbert Rosch
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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>20nC.cm.sup.-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.
Ferroelectric liquid crystal mixtures having a spontaneous polarization of Ps>20nC.cm.sup.-2 and a natural helical pitch of less than one half of the cell thickness, and comprising at least one lipophilizing, lipophilic and/or amphiphilic compound.
Electro-optical display devices having a FLC layer thickness of 1 to 10 .mu.m pro, comprising ferroelectric liquid crystal mixtures, electrodes and alignment layer(s), in which said ferroelectric liquid crystal mixtures have a spontaneous polarization of Ps>20nC.cm.sup.-2 and a natural helical pitch of less than one half of the cell thickness, and comprise at least one lipophilizing, lipophilic and/or amphiphilic compound.
Dependencies are inferred from the claim text.