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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 9 — Mar. 21, 2005
  • pp: 1642–1649

Unique measurement of the parameters of a twisted-nematic liquid-crystal display

Hyun Kim and Yeon H. Lee  »View Author Affiliations


Applied Optics, Vol. 44, Issue 9, pp. 1642-1649 (2005)
http://dx.doi.org/10.1364/AO.44.001642


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Abstract

The parameters of a twisted-nematic liquid-crystal display (TN-LCD) are measured with no ambiguity when we measure the intensity transmittance of a system that simply consists of a TN-LCD, two polarizers, a quarter-wave plate, and a monochromatic beam. First we show analytically that the director angle can have a 90° ambiguity and the twist angle of the liquid-crystal molecules a 180° ambiguity. Then we uniquely measure the parameters by fitting the theoretical predictions to the intensity transmittance measured with and without the quarter-wave plate and by using the quasi local-adiabatic condition. The birefringence of the TN-LCD is measured next as a function of the applied voltage. We design a phase spatial light modulator by using the measured parameters and measure the phase delay of the output beam to excellent agreement with the theoretical prediction.

© 2005 Optical Society of America

OCIS Codes
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices
(230.6120) Optical devices : Spatial light modulators
(260.1440) Physical optics : Birefringence

Citation
Hyun Kim and Yeon H. Lee, "Unique measurement of the parameters of a twisted-nematic liquid-crystal display," Appl. Opt. 44, 1642-1649 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-9-1642


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