標題: Simple and direct measurements of pretilt angles in hybrid-aligned nematic liquid-crystal cells
作者: Wang, Sheng-Ya
Wu, Huang-Ming
Yang, Kei-Hsiung
光電系統研究所
影像與生醫光電研究所
Institute of Photonic System
Institute of Imaging and Biomedical Photonics
公開日期: 20-七月-2013
摘要: We have developed a general approach to perform direct measurements of the pretilt angles from 0 degrees to 75 degrees in hybrid-aligned nematic (HAN) liquid-crystal cells whose cell gaps can also be accurately determined with the help of known pretilt angles. In this paper, we have used a Zeeman laser system to measure the angular-dependence phase retardation of the HAN cells and MATLAB mathematical software to carry out theoretical calculations and fit the measured data to derive the pretilt angles. In general, pretilt angles adjacent to opposite substrates of a HAN cell are different. Our measured pretilt angles of the HAN cell were in good agreement with the measured pretilt angles of two accompanying homogenous cells whose alignment methods were the same as applied to opposite substrates of the HAN cell, respectively. The advantage of direct measurement is easily applicable to measure the pretilt angles of aged HAN cells. (C) 2013 Optical Society of America
URI: http://dx.doi.org/10.1364/AO.52.005106
http://hdl.handle.net/11536/22188
ISSN: 1559-128X
DOI: 10.1364/AO.52.005106
期刊: APPLIED OPTICS
Volume: 52
Issue: 21
起始頁: 5106
結束頁: 5111
顯示於類別:期刊論文


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