Dynamical process of switch-off in a supertwisted nematic cell

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Dynamical process of switch-off in a supertwisted nematic cell

Please use this identifier to cite or link to this item: http://hdl.handle.net/10036/29614

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Title: Dynamical process of switch-off in a supertwisted nematic cell
Author: Yang, Fuzi
Dong, Youmei
Ruan, Lizhen
Sambles, J. Roy
Citation: 96 (1), pp. 310-315
Publisher: American Institute of Physics
Journal: Journal of Applied Physics
Date Issued: 2004
URI: http://hdl.handle.net/10036/29614
DOI: 10.1063/1.1757031
Links: http://dx.doi.org/10.1063/1.1757031 http://link.aip.org/link/?JAPIAU/96/310/1
Abstract: The switch-off dynamics of a 180° supertwisted nematic (STN) are explored in detail by using a convergent beam system and the fully leaky guided-mode technique. From the dynamical guided-mode data and using the Ericksen–Leslie theory, the director structure in the cell at different times during switch-off is obtained. We have studied the dynamic switch-off from different applied voltages and have found that the relaxation time is independent of the voltage. From fitting the optical data, the effective viscosities are obtained. It appears that two viscosity coefficients, γ and η1, largely control the dynamics of switch-off. From the analysis of the director tilt profile in the cell, it is found that there is no backflow-induced increased tilt at the cell center in the STN cell during the switch-off. From liquid crystal hydrodynamics, this no-backflow dynamic process in the STN cell is well explained.
Type: Article
Description: Copyright © 2004 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 96 (2004) and may be found at http://link.aip.org/link/?JAPIAU/96/310/1
Keywords: nematic liquid crystalsliquid crystal displaysswitchingviscositynumerical analysis
ISSN: 0021-8979


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