FAST SWITCHING LIQUID CRYSTAL COMPOSITIONS FOR USE IN BISTABLE LIQUID CRYSTAL DEVICES

摘要

The invention is directed to the use of a fast switching liquid crystal composition said composition comprising at least 30 weight % of a component (alpha) containing one or more compounds having a dielectric anisotropy Deltaepsilon of at least 25, whereby at least 25 weight % of said compounds have a dielectric anisotropy Deltaepsilon of at least 40; and at least 5 weight % of a component (delta) containing one or more compounds having a ratio of gammaSUB1/SUB/TSUBNI/SUBSUPK /SUPof 0.51 mPa.s/K or less, a clearing point TSUBNI /SUBof at least 100° C. and a rotational viscosity gammaSUB1 /SUBof not more than 190 mPa.s (wherein gammaSUB1 /SUBis the rotational viscosity at 20° C. in mPa.s and TSUBNI/SUBSUPK /SUPis the clearing point in degrees Kelvin); in a bistable liquid crystal device and especially in a zenithal bistable nematic liquid crystal device, a nematic liquid crystal medium, and a bistable liquid crystal device comprising said fast switching liquid crystal composition.