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Proceedings Paper

Twisted nematic liquid crystal cell characterization using rotating polarizers including full-field cell gap thickness measurement
Author(s): Kapil Dev; Andy Prakarsa; Yin Xi Jiang; Hooi Leng Lee; Anand Asundi
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Paper Abstract

Liquid crystal cells have always been an important part of commercially available displays, modulators and projectors. In this paper, Jones matrix representation including four independent parameters for twisted nematic liquid crystal (TN-LC) cell has been demonstrated. The physical parameters of the TN-LC cell such as twist angle, birefringence and director orientation at the input face of cell has been calculated using intensity transmittance of an experimental set-up that includes circularly polarized light and TN-LC cell sandwiched between two polarizers. The physical parameters have been calculated without any ambiguity using three different wavelengths. The knowledge from above measurement gives the general information about the birefringence and hence liquid crystal cell gap thickness. To acquire full-field liquid crystal cell gap thickness measurement phase shift polariscope has been adopted. The four phase shifted images through the rotating analyzer gives the full-field cell gap thickness measurement. The experimental results have been compared with the commercial point wise measurement and are in good agreement.

Paper Details

Date Published: 14 April 2010
PDF: 10 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75224N (14 April 2010); doi: 10.1117/12.851662
Show Author Affiliations
Kapil Dev, Nanyang Technological Univ. (Singapore)
Andy Prakarsa, Nanyang Technological Univ. (Singapore)
Yin Xi Jiang, Singapore Polytechnic (Singapore)
Hooi Leng Lee, Ngee Ann Polytechnic (Singapore)
Anand Asundi, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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