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Proceedings Paper

Simulation of V-shaped stability in AFLC
Author(s): Artur Adamski; Herman Pauwels; Kristiaan Neyts; Chris Desimpel; Stefaan Vermael
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Paper Abstract

The V-shaped transmission-voltage characteristics in FLC have been explained by the existence of a splayed state, caused by strong polar interaction with the alignment layers. Both simulation results and analytical calculations have been used to confirm this statement. The conditions that guarantee V-shaped characteristics have been described. There is no consensus on whether V-shaped characteristics can exist in AFLC. In tri-state switching the AFLC will be in the so-called ferroelectric up- (or down-) state FU (FD) for sufficiently high applied positive (negative) voltage. By means of the uniform-(phi) theory it has been shown that if V decreases to zero, one first follows the symmetrical up- (down-) state SU (SD), and then switches back to the normal alternating state so called antiferroelectric state AF. In this article we investigate switching from a strong positive voltage to zero and check under which conditions one ends up in a special alternating state SA, with both polarizations parallel to the glass surfaces, instead of in the normal alternating state, with both polarizations perpendicular to the glass surfaces. The first case guarantees V-shaped switching in AFLC, the second case leads to tri-stable switching. The simulation program is based on implicit iteration and on the Newton-Raphson linearization method. Several simulation results will be shown and discussed. They confirm that V-shaped switching occurs in AFLC under approximately the same conditions as for FLC, i.e. with strong interactions with the alignment layers.

Paper Details

Date Published: 27 June 2002
PDF: 8 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472135
Show Author Affiliations
Artur Adamski, Ghent Univ. (Belgium)
Herman Pauwels, Ghent Univ. (Belgium)
Kristiaan Neyts, Ghent Univ. (Belgium)
Chris Desimpel, Ghent Univ. (Belgium)
Stefaan Vermael, Ghent Univ. (Belgium)


Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications

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