Patent Number: 8,821,992

Title: Oligosiloxane modified liquid crystal formulations and devices using same

Abstract: A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified 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.degree. C. to about 35.degree. C., a tilt angle of about 22.5.degree..+-.6.degree. or about 45.degree..+-.6.degree., a spontaneous 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 .mu.s when switched between two stable states, and an electric drive field of less than about 30 V/.mu.m.

Inventors: Hannington; Jonathan Paul (Midland, MI), Clapp; Terry Victor (Bishop's Stortford, GB), Nishida; Fumito (Midland, MI), King; Russel Keith (Midland, MI), Farooq; Omar (Saginaw, MI), Grasmann; Martin (Midland, MI), Crossland; William Alden (Harlow, GB), Coles; Harry James (Sutton Ely, GB), Davey; Anthony Bernard (Cambridge, GB), Xu; Huan (Cambridge, GB), Hadeler; Oliver (Cambridge, GB), Pivnenko; Mykhaylo (Cambridge, GB)

Assignee: Dow Corning Corporation

International Classification: C09K 19/40 (20060101); G02F 1/141 (20060101); C09K 19/12 (20060101); C09K 19/34 (20060101); C09K 19/54 (20060101); C09K 19/20 (20060101)

Expiration Date: 9/02/12018