Ferroelectric liquid crystal optical device with viscosity not m

Details Ferroelectric liquid crystal optical device with viscosity not m Ferroelectric liquid crystal optical device with viscosity not m

1991-05-22

1993-03-23

Sikes, William L.

Optical: systems and elements

Optical computing without diffraction

359 78, G02F 113, G02F 11337

Patent

active

051969556

ABSTRACT:
An improved liquid crystal optical device utilizing a ferroelectric liquid crystal and a driving method for the same are described. A ferroelectric liquid crystal material disposed between a pair of substrates in the optical device has a coefficient of viscosity of 5000 cps to 30000 cps and a negative dielectric anisotropy at operational temperatures, e.g. between 10.degree. C. and 40.degree. C. The liquid crystal consists of a number of layers normal to the substrates. The constituent layer in turn consists of liquid crystal molecules parallel to the substrates. Misalignment of the molecules yields bends in the layered structure which degrades the contrast ratio. When given alternating electric fields, the molecules are subjected to an electric torque which exerts thereon in order to force the molecules parallel to the substrate by virtue of the negative dielectric anisotropy so that the bends can be removed.

REFERENCES:
patent: 4902107 (1990-02-01), Tsuboyama et al.
patent: 4917469 (1990-04-01), Ross
patent: 4923285 (1990-05-01), Ogino et al.
patent: 5033822 (1991-07-01), Ooki et al.
patent: 5071589 (1991-12-01), Dubal et al.

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