DocumentCode :
75602
Title :
Extracting the Physical Optical Parameters of TNLC Cell Using Effective Parameters and Stokes Polarimetry Method
Author :
Yu-Lung Lo ; Tsung-Tse Yang ; Chia-Chi Liao
Author_Institution :
Dept. of Mech. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Volume :
10
Issue :
6
fYear :
2014
fDate :
Jun-14
Firstpage :
478
Lastpage :
483
Abstract :
A method is proposed for determining the cell gap, twist angle and pretilt angle of twisted nematic liquid crystal (TNLC) cells. In the proposed approach, the effective optical parameters of the TNLC cells are measured using a Stokes polarimetry method and the physical optical parameters are then extracted from these effective parameters using a simple analytical technique. The experimental results for the TNLC cell show that the extracted values of the twist angle, pretilt angle and cell gap are Φ = 89.864°±0.028°, ξ = 1.806°±0.050° and d=10.696 μm±0.025 μm, respectively. The experimental results for the twist angle and cell gap deviate from the known values by just ΔΦ = 0.136° and Δd=0.196 μm, respectively. Moreover, the pretilt angle is found to lie in the reliable range. In contrast to existing methods, the technique proposed in this study requires the use of only a single illuminating wavelength. As a result, it provides a cheaper and more straightforward approach for extracting the three physical parameters of TNLC cells than existing optical-parameter measurement schemes.
Keywords :
liquid crystal devices; nematic liquid crystals; polarimetry; Stokes polarimetry method; TNLC cell; cell gap; effective parameters; physical optical parameters; pretilt angle; twist angle; twisted nematic liquid crystal cells; Adaptive optics; Analytical models; Liquid crystal displays; Optical refraction; Optical variables measurement; Stokes parameters; Cell gap; Stokes parameters; effective parameters; pretilt angle; twist angle; twisted nematic liquid crystal (TNLC);
fLanguage :
English
Journal_Title :
Display Technology, Journal of
Publisher :
ieee
ISSN :
1551-319X
Type :
jour
DOI :
10.1109/JDT.2014.2302455
Filename :
6722916
Link To Document :
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