摘要
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。
In order to introduce EDA technique into the field of study,development and design of VFLC （V-shaped ferroelectric liquid crystal） opto-electric integrated system,an equivalent circuit model for VFLC is proposed. The impedance divider induced by multilayer structure of ferroelectric liquid crystal cell and the drive circuit is considered,and both polar and nonpolar anchoring energy are taken into account in the equivalent model. The anomalous hysteresis form,the genuine V-shaped form and the normal hysteresis form of opto-electric hysteresis curve are reproduced by the equivalent model. The simulative result and analysis of the effects of spontaneous polarization on the opto-electric hysteresis curve are given. Simulation results show that：1） the coercive voltage increases as drive voltage frequency increases,however its varying velocity drops as spontaneous polarization increases; 2） the coercive voltage reaches its minimum of -0.084V when spontaneous polarization is 80nC/cm2,and the hysteresis inversion frequency reaches its maximum of 6.4Hz when spontaneous polarization is 90nC/cm2; 3） the hysteresis inversion frequency increases nearly linearly with spontaneous polarization increases when spontaneous polarization is below 80nC/cm2. Results above agree with the experimental results in both magnitude and trend.
出处
《光学技术》
CAS
CSCD
北大核心
2010年第6期842-847,共6页
Optical Technique
基金
深圳大学博士启动基金(801000035)
关键词
V字型铁电液晶
电路模型
自发极化强度
迟滞反转频率
V-shaped ferroelectric liquid crystal （VFLC）
circuit model
spontaneous polarization
hysteresis inversion frequency
