Charge-discharge Characteristics of Thin Polymer Films Used for Liquid Crystal Alignment Materials

Abstract

The charge-discharge characteristics of the thin polymer films used for liquid crystal alignment materials were measured under vacuum with the film thickness of 300nm. The results showed that the internal offset DC voltage of LC cells was related to the charge-discharge characteristics of the alignment films. Also, the internal offset DC voltage of LC cells was discussed based on the equivalent circuit of LC cell, and it was found that the capability of the charges accumulated at the interface of liquid crystal and alignment film could be evaluated by the time constant, i.e. RC of the alignment films.