Liquid crystal material mixtures and devices incorporating such mixtures

Abstract

A liquid crystal material mixture for use in liquid crystal displays is arranged to have a small display threshold voltage change with temperature over a desired operating range, e.g. 0.degree. to 40.degree. C. This is obtained by a mixture of at least one liquid crystal material of type A and at least one liquid crystal material of a type B; wherein type A has the following phases with increasing temperature: crystal working phase isotropic; type B has the following phases with increasing temperature; crystal working phase smectic working phase isotropic; and the working phase is nematic or cholesteric. The resulting mixture has only one phase, the working phase, between crystalline and isotropic phases but has a lower threshold voltage change with temperature characteristic than a type A material alone.

Dependencies are inferred from the claim text.