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Screening effect of a-C:H alignment layer in nematic liquid crystal cell
Authors:E A Konshina  E O Gavrish
Affiliation:1.St. Petersburg State University of Information Technologies, Mechanics, and Optics,St. Petersburg,Russia
Abstract:The electrical and optical characteristics of nematic liquid crystal (NLC) cells and their dependence on the thickness of an amorphous hydrogenated carbon (a-C:H) alignment layer have been studied. An increase in the a-C:H layer thickness favors enhancement of the screening of a bias voltage applied to this layer, which is manifested by an increase in the threshold voltage of the electrooptical splay effect. This is accompanied by a decrease in the initial (pretilt) director angle, which is evidence for an increase in the anchoring energy due to the field of space charge localized at the interface.
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