RESIDUAL DC VOLTAGE EVALUATING METHOD AND EVALUATION DEVICE THEREFOR

摘要

A residual DC voltage evaluating method for evaluating residual DC voltage produced in a liquid crystal cell comprising a liquid crystal held between oriented films, in which a plurality of sets of a combination of voltage applying time t during which a voltage is applied to the liquid crystal cell externally with a residual DC voltage V<SUB>rDC</SUB> produced by applying a voltage during the voltage applying time t are measured, and the measurements plotted at a plurality of points as reference signs (30) are curve-fitted using the expression 1. [Expression 1] V<SUB>rDC</SUB>(t) = {q/C<SUB>LC</SUB>}{k<SUB>a</SUB>n<SUB>f</SUB> /(k<SUB>a</SUB>n<SUB>f </SUB>+ k<SUB>d</SUB>)}N[1-exp{-(k<SUB>a</SUB>n<SUB>f</SUB> + k<SUB>d</SUB>)t}] Accordingly, a residual DC voltage evaluating method is provided which can compare between materials by obtaining parameters specific to liquid crystal materials and oriented film materials.