Equivalent Circuit Model for Thresholdless Antiferroelectric Liquid Crystal Displays

概要

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For high quality displays, analog responding liquid crystals with spontaneous polarization need to be coupled with active matrix driving schemes. Our goal is to investigate the possibilities for optimizing liquid crystal materials, thin film transistors, and driving schemes. In this paper, the electrooptical properties of thresholdless antiferroelectric (TLAF) liquid crystal displays (LCDs), which are analog responding, are modeled using an electric circuit which can be applied to conventional simulators. A novel procedure for deducing the circuit parameters on the basis of the experimental results is discussed. It was found that the voltage-dependent capacitance due to the induced spontaneous polarization is important for describing the static and dynamic behavior at different applied voltages. It is shown that our equivalent circuit model reproduces the pixel voltage as well as the transmittance of active-addressed TLAF-LCDs.
社団法人応用物理学会の論文
1999-07-15