液晶与显示, 2014, 29 (5): 686, 网络出版: 2014-08-18   

基板锚定特性对液晶盒电容的影响

Influence of anchoring property of substrate on capacitance of liquid crystal cell
作者单位
河北工业大学 理学院,天津 300401
摘要
基板的锚定特性,包括锚定能大小和锚定易取方向,影响液晶指向矢的分布,直接导致液晶盒电容的改变,因此可以通过液晶盒电容的测量确定基板表面的锚定特性。基于液晶弹性理论和变分原理,理论推导弱锚定平行排列向列相和混合排列向列相液晶盒系统的平衡态方程和边界条件,采用差分迭代方法数值模拟得到了液晶盒约化电容随电压、锚定能系数及锚定易取方向变化的曲线。结果表明:液晶盒电容随基板锚定能系数的增加而减小;随预倾角的增加,液晶盒电容随锚定能系数的变化缩小;同一电压和基板锚定能系数下,平行排列向列相液晶盒电容不会大于混合排列向列相液晶的电容。
Abstract
The anchoring property of substrate, including the anchoring energy and the anchoring easy directon, can affect the distribution of liquid crystal director, which results in the capacitance change of liquid crystal cell, so the anchoring property may be determined by measuring the capacitance of liquid crystal cell. Based on liquid crystal elasticity theory and variational principles, the equilibrium equation and the boundary condition of weak anchoring parallel aligned nematic (PAN) and hybrid aligned nematic (HAN) liquid crystal cell are deduced theoretically. The variations of reduced capacitance of liquid crystal cell with applied voltage, anchoring energy coefficient and anchoring easy direction are simulated using the finite difference iterative method. The results show that the capacitance of liquid crystal cell will decrease with increase of the anchoring energy coefficient;the variation of capacitance of liquid crystal cell with the anchoring energy coefficient will reduce with the increase of pretilt angle;the capacitance of PAN cell is not greater than that of HAN cell for the same voltage and anchoring energy coefficient of substrate.
参考文献

[1] Yang D K, Wu S T.Fundamentals of Liquid Crystal Devices [M].Chichester: John Wiley & Sons Ltd, 2006: 274.

[2] Stephen W M.Measurements of the elastic constants of a liquid crystal [D].Vancouver: University of British Columbia, 1985.

[3] 崔文静, 邢红玉, 叶文江, 等.液晶可调电容器的研究[J].液晶与显示,2013, 28(2): 173-178.

    Cui W J, Xing H Y, Ye W J,et al.Liquid crystal tunable capacitor [J].Chinese Journal of Liquid Crystals and Displays,2013, 28(2): 173-178. (in Chinese)

[4] Welford K R, Miners F, Sambles J R. A new technique for determining the dielectric constants of a nematic liquid crystal [J].J Phys D: Appl Phys,1988, 21: 1320-1325.

[5] 温庆祥, 黄锡瑕, 何林, 等.CV法液晶弹性常数的测定[J].液晶与显示,1993, 8(1): 73-78.

    Wen Q X, Huang X M, He L, et al.Measurement of liquid crystal elastic constants by CV method [J].Chinese Journal of Liquid Crystals and Displays,1993, 8(1): 73-78. (in Chinese)

[6] 孔祥建, 荆海, 黄霞, 等.一种改进的CV方法对向列相液晶弹性常数k11、k33测量的理论研究[J].液晶与显示,2007, 22(5): 587-590.

    Kong X J, Jing H, Huang X, et al.Theoretical research of improved CV method to measure k11 and k33 of nematic liquid crystals [J].Chinese Journal of Liquid Crystals and Displays,2007, 22(5): 587-590. (in Chinese)

[7] 崔文静, 邢红玉, 张艳君, 等.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): 142-150.

    Cui W J, Xing H Y, Zhang Y J, et al.Influence of the flexoelectric effect on the capacitance of nematic liquid crystal cell [J].Journal on Numerical Methods and Computer Applications,2012, 33(2): 142-150. (in Chinese)

[8] 崔文静, 邢红玉, 张艳君, 等.混合排列向列相液晶盒电容特性研究[J].液晶与显示,2012, 27(5): 608-612.

    Cui W J, Xing H Y, Zhang Y J, et al.Capacitance characteristics of hybrid aligned nematic liquid crystal cell [J].Chinese Journal of Liquid Crystals and Displays,2012, 27(5): 608-612. (in Chinese)

[9] Takahashi T, Hashidate S, Nishijou H, et al.Novel measurement method for flexoelectric coefficients of nematic liquid crystals [J].Jpn.J.Appl.Phys.,1998, 37(4A):1865-1869.

[10] Jewell S A, Sambles J R. Fully leaky guided mode study of the flexoelectric effect and surface polarization in hybrid aligned nematic cells [J].J.Appl.Phys.,2002, 92(1): 19-24.

[11] Yokoyama H, Sprang H A. A novel method for determining the anchoring energy function at a nematic liquid crystal-wall interface from director distortions at high fields [J].J.Appl.Phys.,1985, 57(10): 4520-4526.

[12] Nastishin Y A, Polak R D, Shiyanovskii S V,et al.Nematic polar anchoring strength measured by electric field techniques [J].J.Appl.Phys.,1999, 86(8): 4199-4213.

[13] Blinov L M,Chigrinov V G.Electrooptic Effects in Liquid Crystal Materials [M]. New York: Springer Verlag, 1994: 135-138.

[14] 王谦, 何赛灵.液晶指向矢分布的模拟和比较研究[J].物理学报,2001, 50(5): 926-932.

    Wang Q , He S L. Simulation and comparison study of liquid crystal director distributions [J].Acta Physica Sinica,2001, 50(5): 926-932. (in Chinese)

[15] 张志东, 叶文江, 邢红玉.液晶盒中挠曲电效应的计算 [J].计算物理,2004, 21(2): 156-160.

    Zhang Z Z, Ye W J, Xing H Y. Calculation of the flexoelectric effect in the liquid crystal cell [J].Chinese J Comput Phys,2004, 21(2): 156-160. (in Chinese)

叶文江, 刘小松, 宋晓龙, 郑桂丽. 基板锚定特性对液晶盒电容的影响[J]. 液晶与显示, 2014, 29(5): 686. YE Wenjiang, LIU Xiaosong, SONG Xiaolong, ZHENG Guili. Influence of anchoring property of substrate on capacitance of liquid crystal cell[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(5): 686.

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