Patent ID: 7335405
Filing Date: 2008-02-26
Classification: C09K

Abstract:
1. In a bistable liquid crystal device comprising a liquid crystal composition being situated between two substrates, forming a cell, electrode structures with alignment layers on the inner side of said substrates, whereby at least one alignment layer comprises a weak zenithal anchoring characterised by a breaking voltage U the improvement wherein said liquid crystal composition has: and said liquid crystal composition includes: a) at least 40% by weight of compounds with strong molecular polarisability (Δ∈>10) and strong dipole moment (μ>1D), however with weak zenithal anchoring, chosen from among compounds with the following formulas (AI, AII, AIII and AIV): in which:R R R Z Z b) 0 to 50% by weight of compounds with weak anchoring chosen from among compounds with the following formulas (BI, El and FI): in which: R R Z c) 0 to about 20% by weight of compounds comprising dipoles chosen from among compounds with the following formulas (CI and CII): in which: R R′ R R Z X d) 0 to 5% by weight of compounds with the following formulas (DI and DII): where: R R Z X