ELECTRO-OPTIC DISPLAY METHODS

摘要

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 at a crossover audio frequency of an applied field. Illuminating such a composition and simultaneously subjecting it alternately to an electric field of a first audio frequency below the crossover frequency and an electric field of a second audio frequency above the crossover frequency causes alteration of the molecular orientation and optical properties of the composition so as to modulate the incident radiation.