A method for the determination of rotational viscosity γ1 and pretilt angle θ° in twisted nematic liquid crystal cells is proposed. The method is based on the analysis of transient current of a cell excited by a dc voltage pulse. The accuracy of γ1 and θ° values determined by the method is demonstrated by means of numerical calculation of exact basic equations. Experimental results for a ZLI2293 (Merck) cell are presented, and the γ1 values obtained are found to be in excellent agreement with values in the literature.
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Imai et al. (1995) studied this question.
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