Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal

doi:10.1088/1674-1056/24/10/106102

中国物理B ›› 2015, Vol. 24 ›› Issue (10): 106102-106102.doi: 10.1088/1674-1056/24/10/106102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal

关荣华^a, 叶文江^b, 邢红玉^b

a School of Sciences, North China Electric Power University, Baoding 071003, China;
b School of Sciences, Hebei University of Technology, Tianjin 300401, China

收稿日期:2015-03-28 修回日期:2015-05-25 出版日期:2015-10-05 发布日期:2015-10-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11274088, 11374087, and11304074), the Natural Science Foundation of Hebei Province, China (Grant No. A2014202123), the Research Project of Hebei Provincial Education Department, China (Grant No. QN2014130), and the Key Subject Construction Project of Hebei Provincial University, China.

Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal

Guan Rong-Hua (关荣华)^a, Ye Wen-Jiang (叶文江)^b, Xing Hong-Yu (邢红玉)^b

a School of Sciences, North China Electric Power University, Baoding 071003, China;
b School of Sciences, Hebei University of Technology, Tianjin 300401, China

Received:2015-03-28 Revised:2015-05-25 Online:2015-10-05 Published:2015-10-05
Contact: Guan Rong-Hua, Ye Wen-Jiang E-mail:ronghua_guan@163.com;wenjiang_ye@hebut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11274088, 11374087, and11304074), the Natural Science Foundation of Hebei Province, China (Grant No. A2014202123), the Research Project of Hebei Provincial Education Department, China (Grant No. QN2014130), and the Key Subject Construction Project of Hebei Provincial University, China.

摘要/Abstract

摘要： The physical effects on surface and flexoelectric polarization in a weak anchoring nematic liquid crystal cell are investigated systematically. We derive the analytic expressions of two effective anchoring energies for lower and upper substrates respectively as well as their effective anchoring strengths and corresponding tilt angles of effective easy direction. All of these quantities are relevant to the magnitudes of both two polarizations and the applied voltage U. Based on these expressions, the variations of effective anchoring strength and the tilt angle with the applied voltage are calculated for the fixed values of two polarizations. For an original weak anchoring hybrid aligned nematic cell, it may be equivalent to a planar cell for a small value of U and has a threshold voltage. The variation of reduced threshold voltage with reduced surface polarization strength is also calculated. The role of surface polarization is important without the adsorptive ions considered.

关键词: surface and flexoelectric polarization, effective anchoring energy, easy direction, hybrid aligned nematic, threshold voltage

Abstract: The physical effects on surface and flexoelectric polarization in a weak anchoring nematic liquid crystal cell are investigated systematically. We derive the analytic expressions of two effective anchoring energies for lower and upper substrates respectively as well as their effective anchoring strengths and corresponding tilt angles of effective easy direction. All of these quantities are relevant to the magnitudes of both two polarizations and the applied voltage U. Based on these expressions, the variations of effective anchoring strength and the tilt angle with the applied voltage are calculated for the fixed values of two polarizations. For an original weak anchoring hybrid aligned nematic cell, it may be equivalent to a planar cell for a small value of U and has a threshold voltage. The variation of reduced threshold voltage with reduced surface polarization strength is also calculated. The role of surface polarization is important without the adsorptive ions considered.

Key words: surface and flexoelectric polarization, effective anchoring energy, easy direction, hybrid aligned nematic, threshold voltage

中图分类号: (Orientational order of liquid crystals; electric and magnetic field effects on order)

61.30.Gd

42.79.Kr (Display devices, liquid-crystal devices)

关荣华, 叶文江, 邢红玉. Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal[J]. 中国物理B, 2015, 24(10): 106102-106102.

Guan Rong-Hua (关荣华), Ye Wen-Jiang (叶文江), Xing Hong-Yu (邢红玉). Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal[J]. Chin. Phys. B, 2015, 24(10): 106102-106102.

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Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal

Influences of surface and flexoelectric polarization on the effective anchoring energy in nematic liquid crystal

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