OLIGOSILOXANE-MODIFIED LIQUID CRYSTAL FORMULATIONS AND DEVICES USING SAME

摘要

A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modi-fied nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane-modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or non-liquid crystalline materials, wherein the liquid crystal formulation has an I.fwdarw. SmA*.fwdarw. SmC* phase transition, with a SmC* temperature range from about 15°C to about 35°C, a tilt angle of about 22.5° ~ 6° or about 45° ~ 6°, a spon-taneous polarization of less than about 50 nC/cm2., and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 µs when switched between two stable states, and an electric drive field of less than about 30 V/ µm.