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挠曲电效应对向列相液晶盒电容的影响

  

  1. 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
  • 收稿日期:2011-11-09 出版日期:2012-06-15 发布日期:2012-06-13
  • 基金资助:
    河北省自然科学基金(No.A2010000004)和河北省教育厅项目(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.

崔文静, 邢红玉, 张艳君, 叶文江, 张志东. 挠曲电效应对向列相液晶盒电容的影响[J]. 数值计算与计算机应用, 2012, 33(2): 129-137.

Cui Wenjing, Xing Hongyu, Zhang Yanjun, Ye Wenjiang, Zhang Zhidong. INFLUENCE OF THE FLEXOELECTRIC EFFECT ON THE CAPACITANCE OF NEMATIC LIQUID CRYSTAL CELL[J]. Journal of Numerical Methods and Computer Applications, 2012, 33(2): 129-137.

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

Cui Wenjing, Xing Hongyu, Zhang Yanjun, Ye Wenjiang, Zhang Zhidong   

  1. 1. School of Sciences, Hebei University of Technology, Tianjin 300401, China;
    2. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
    3. Graduate School of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-11-09 Online:2012-06-15 Published:2012-06-13
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 influence will vary with both the value and the sign of the flexoelectric coefficients.

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