铁电液晶显示的交流稳态技术与等效电路模型改进

The AC Stabilization Technique and an Improved Equivalent Circuit Model for Displays Incorporating Ferroelectric Liquid Crystals

针对交流稳态技术提出了一种改进的能体现铁电液晶电学、光学各向异性的等效电路模型.通过将介电张量与电场的耦合作用和由表面定向层引起的锚定能量以等效源的形式表达在电路模型中,成功地将模型拓展到介电各向异性情况下.分别就正、负性介电各向异性及应用交流稳态技术时的光响应特性和动力学机制进行了模拟,并给出了对应的介电扭矩、铁电扭矩和极化反转电流.模拟结果吻合于理论分析及文献报道的结果,表明了电路模型的有效性.

An improved equivalent circuit model for ferroelectric liquid crystal （FLC） in which the anisotropic electro-optical properties are presented is proposed to simulate the AC stabilization technology. The coupling effects of electric fields to dielectric tensor as well as the surface anchoring forces due to alignment layers are included in the model by equivalent current sources to make it has the capability in optical response prediction and dynamic analysis when dielectric anisotropy of FLC is of a relatively high value. Optical responses in cases of positive anisotropy and negative anisotropy, and with AC stabilization technology are displayed, and the dielectric torque, ferroelectric torque and polarization reversal current are given. The simulation results indicate a good quantitative agreement with the theoretical analysis and the published results.