Liquid crystal device providing tilt angle inclination angle and ps satisfying relationships at 55 degrees

摘要

A liquid crystal device including: a pair of substrates and a chiral smectic liquid crystal disposed between the pair of substrates. Each of the pair of substrates has an electrode for applying a voltage to the liquid crystal. The pair of substrates is provided with respective uniaxial alignment axes extending in directions which are parallel to each other or intersect each other at a prescribed angle. The chiral smectic liquid crystal is placed in such an alignment state that the liquid crystal assumes at least two stable states and provides a pretilt angle &agr; (degrees), a tilt angle H (degrees), an inclination angle . delta. (degrees) of the liquid crystal layer, and an apparent tilt angle . theta.a satisfying the following relationships (I) and (II) in a temperature range of 10°-55° C.:PPH . alpha.+ &dgr; and &dgr; &agr; (I), andPPH . theta.a H/2 (II).PPThe liquid crystal provides a tilt angle H (degrees), an inclination angle &dgr; (degrees) of the liquid crystal layer, and a spontaneous polarization Ps (nC/cm.sup.2) satisfying the following relationships (III) and (IV) at 55° C. :PP H×&dgr; 70 (III), andPPH. times.&dgr;/Ps 20 (IV).