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Two types of fast switching mixtures with high positive dielectric anisotropy were described. The first type, with a birefringence below 0.3, was designed for devices operating at room or lower temperatures and the second one, with a birefringence higher than 0.3 for devices operating at elevated temperatures.

Shock-free ferroelectric liquid crystal displays with high optical contrast and low operating voltage are the concern of this contribution. Ferroelectric liquid crystal compositions with a wide temperature range of the chiral smectic C phase are designed. The influence of the chiral fragments of the molecules, especially their length, on the mechanical stability of the SmC∗ phase has been investigated. The relation between the surface anchoring energy of the aligning polymer and the viscoelastic properties of the SmC∗ phase has been described. Our qualitative model reflects the resistance of the SmC∗ layer structure against mechanical and thermal action.

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