Dynamic Mechanism of Fast Switching in Light Valve Using Liquid Crystal

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Abstract
A light valve using a liquid crystal previously developed by the authors has a fast switching time of less than 1 ms. The fast switching mechanism of the value is studied theoretically in terms of the static characteristics of light transmission and the transient behavior of the cooperative angular variation of molecules submitted to an electric field. The variation in the light transmission is well explained by an analysis using optical anisotropy. The dynamic mechanism of the fast switching time is also interpreted by the principle of energy conservation related to the elastic, dielectric and viscous torque of the liquid crystal. The analytical results of the static and dynamic characteristics agree well with the experimental results.