Use of equivalent films to reduce effects of nonuniform liquidcrystal thickness in a liquid-crystal image transducer

Output intensity variations produced by nonuniform liquid-crystal thickness in some Hughes liquid-crystal image transducers can be substantially reduced by replacing the readout side electrode and SiO(2) insulating layer by a symmetrical SiO(2)-electrode-SiO(2) film that is made optically equivalent to glass by adjusting the layer thicknesses.