Field effect light shutter employing low temperature nematic liquid crystals

Claim 1

In a field effect liquid cyrstal display of the type in which a layer of liquid crystal material of positive dielectric anisotropy is sandwiched between transparent conductive electrodes; the improvement wherein said liquid crystal material comprises a mixture of at least three different liquid crystal compounds wherein in at least the first two of said compounds have the general formula: ##STR10## wherein the radical Y comprises an ester linkage ##STR11## and the X and Z radicals are selected from the group consisting of a saturated alkyl group having 1 to 18 carbon atoms and an alkoxy group having 1 to 18 carbon atoms, and the third of said compounds ##STR12## has the general formula: ##STR13## wherein the radical Z' is selected from the group consisting of methyl and an alkoxy group having 1 to 18 carbon atoms and wherein the third of said compounds is present in the range of about 3 to 40 weight percent.