Dynamic Properties of Twisted Nematic Liquid Crystal Cells

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Abstract
The applied voltage dependence of rise and decay responses in TN cells was investigated. It was made clear that the rise response should be divided into two components, delay time (td) and rise time (tr), because both showed different voltage dependences. tr showed good coincidence with a theoretical equation, 1/tr=k(tr)(V2-Vth2), where k(tr)=ε0Δε/4πηd2. On the other hand, the following equation was given for td: 1/td=k(td)(V2-V2th)+C, where k(td) was always smaller than k(tr). Next, it was clarified that a tdecay applied voltage dependence also existed, and that dependence was then formulated. The following experimental equation was proposed :tdecay=\frac{\eta{d}^{2}}{\pi^{2}{K}}(\frac{V}{V_{\text{th}}}-1)a where a\fallingdotseq0.3. The physical meaning of the equation was explained with respect to a decay response pattern and "shear flow" motion.

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