挠曲电效应对向列相液晶盒电容的影响  

INFLUENCE OF THE FLEXOELECTRIC EFFECT ON THE CAPACITANCE OF NEMATIC LIQUID CRYSTAL CELL

作　　者：崔文静[1] 邢红玉[1,2,3] 张艳君[1] 叶文江[1] 张志东[1] 

机构地区：[1]河北工业大学理学院,天津300401 [2]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,长春130033 [3]中国科学院研究生院,北京100049

出　　处：《数值计算与计算机应用》2012年第2期129-137,共9页Journal on Numerical Methods and Computer Applications

基　　金：河北省自然科学基金(No.A2010000004);河北省教育厅项目(No.Z2011133);国家自然科学基金(No.11147103和No.10974042);河北省高校重点学科资助项目.

摘　　要：液晶盒本身可以看作是一个电容器.在外加电压作用下,液晶的有效介电常数会发生变化,导致液晶盒电容的改变.基于液晶弹性理论和变分原理,理论推导平行排列向列相液晶盒电容的解析表达式,由Matlab软件数值模拟了此液晶盒的电容—电压曲线,分析了挠曲电效应对强锚泊平行排列向列相液晶盒电容的影响.无论展曲和弯曲挠曲电系数和e为正还是负,电容随电压的增大而增加,低电压条件下挠曲电效应的影响较明显.并且,挠曲电系数的大小和符号不同时,影响程度也会随之改变.Liquid crystal cell itself may be seen as a capacitor. The effective dielectric constant of liquid crystal filled in this cell will change under an external applied voltage, which can result in the variation of the capacitance in liquid crystal cell. Based on liquid crystal elasticity theory and variational principles, the analytical expression of the capacitance in strong anchoring parallel aligned nematic liquid crystal cell is deduced theoretically. The capacitance-voltage curves of this cell are simulated numerically by using the Matlab software for different flexoelectric coefficients of liquid crystal material, from which the influence of flexoelectric effect on the capacitance of nematic liquid crystal cell is analyzed. The capacitance increases with increasing of the applied voltage whether the sum of splay and bend flexoelectric coefficient e is positive or negative and the distinct influence of flexoelectric effect appears at the lower voltage. And, the infuence will vary with both the value and the sign of the flexoelectric coefficients.

关 键 词：挠曲电效应 有效介电常数 电容 向列相液晶 

分 类 号：TN104.3[电子电信—物理电子学]