Eastman-kodak Company

Hermann K Bucher

Robert M Goodwin

Richard T Klingbiel

Thomas R Criswell

An electro-optic display is provided which uses a liquid crystalline composition (a) having a positive, zero frequency dielectric anisotropy and (b) exhibiting a dielectric anisotropy inversion with increasing frequency of an applied field. Such a composition is subjected to an electric field of a first audio frequency and then subjected to a field of a second audio frequency of a magnitude sufficient to produce a dielectric anisotropy inversion in said composition. The resultant anisotropy changes allow the molecular orientation of the composition to be altered by the applied field thereby changing the optical properties of the composition.

Electro-optic display devices and methods

Dynamic scattering of nematic liquid crystalline compositions is enhanced by the addition of minor amounts of soluble salts having an organic carboxylate or organic sulfonate anion. The addition of these salts results in a lowering of the operating voltages necessary to obtain dynamic scattering.

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Rochester, NY, United States of America

Hermann K Bucher