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提出了关于V字型铁电液晶(V-shaped Ferroelectric Liquid Crystal,VFLC)的等效电路模型,旨在将EDA技术引入对VFLC光电集成系统进行研究、开发和设计。该模型考虑了由铁电液晶盒多层结构和驱动电路引起的阻抗分配效应,以及极化与非极化锚定能对VFLC光电响应特性的影响。演示了电光迟滞曲线的反常迟滞、V字型及正常迟滞状态,并着重就自发极化强度对电光迟滞曲线的影响给出了模拟结果和分析。结果表明:强制电压随驱动信号频率的提高而增加,但增加速度随自发极化强度的提高而减慢;强制电压和迟滞反转频率随自发极化强度的变化均存在一个拐点,强制电压在自发极化强度为80nC/cm2时取到最小值(-0.084V),迟滞反转频率在自发极化强度为90nC/cm2时达到最大值(6.4Hz);自发极化强度小于80nC/cm2时,迟滞反转频率随自发极化强度准线性增加。模拟结果从量级和趋势上均与实验结果吻合。
An equivalent circuit model of V-shaped ferroelectric liquid crystal (VLCF) is proposed to introduce EDA technology into the research, development and design of a VFLC integrated system. The model considers the impedance assignment effect caused by the multilayer structure of the ferroelectric liquid crystal cell and the driving circuit, and the influence of polarization and non-polarization anchoring on the electro-optical response of VFLC. The abnormal hysteresis, V shape and normal hysteresis of the electro-optical hysteresis curve are demonstrated. The simulation results and analysis are given focusing on the influence of the spontaneous polarization on the electro-optical Hysteresis curve. The results show that the forced voltage increases with the increase of the driving signal frequency, but the increasing speed slows down with the increase of spontaneous polarization. There is an inflection point between the compulsory voltage and the hysteretic reversal frequency with the spontaneous polarization, When the spontaneous polarization intensity is 80nC / cm2, the minimum value (-0.084V) is obtained. The hysteretic reversal frequency reaches the maximum (6.4Hz) when the spontaneous polarization intensity is 90nC / cm2. When the spontaneous polarization intensity is less than 80nC / cm2 The hysteretic reversal frequency increases linearly with the spontaneous polarization. The simulation results are consistent with the experimental results on the order of magnitude and trend.