The investigation of a dc induced transient optical 30-Hz element in twisted nematic liquid-crystal displays

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Abstract
Using a simulation experiment, transient optical 30‐Hz elements which respond to dc signal changes in thin‐film transistor liquid‐crystal display are investigated. After dc voltage is applied, even without dc voltage, the 30‐Hz element appears and decays to the level in the steady state. This is explained by the generation of an electric double layer. The generation mechanism of the layer is described by an equation with a creation time constant τ1 and a disappearance time constant τ2, and these values are estimated to be approximately 1400 and 500 s, respectively. The relaxation process is described by the empirical model in which relaxation time constant is initially 60 s and increases as a function of time.

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