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Electrooptic Response of Reflective-Mode, ?/4-Twisted-Nematic Liquid Crystal Cell in the Voltage Regions Close to and Distant from the Freedericksz Transition Threshold

Authors :
Lee, Geon Joon
Kim, Sang Hyuck
Jo, Jae Cheol
Lim, Tong Kun
Yoon, Jae Sun
Kwon, Soon Bum
Source :
Japanese Journal of Applied Physics; December 1999, Vol. 38 Issue: 12 p6739-6739, 1p
Publication Year :
1999

Abstract

Two reflective-mode, ?/4-twisted-nematic liquid crystal cells were prepared using E7 and ZLI 4801-000 liquid crystals and their electrooptic responses were measured in the voltage regions close to and distant from the Freedericksz transition threshold. Our reflectivity data distant from the threshold voltage (Vth) could not be described by the model that assumed a linearized distribution of the twist angle across the cell and considered the voltage dependency of the tilt angle to follow the equation suggested by Lu and Saleh [Appl. Opt. 30 (1991) 2354], although the fit is good near Vth. We determined that the reflectivity in the voltage region distant from Vthshould be calculated using the model that considers the distributions of the tilt angle and the twist angle. The director-axis distributions were obtained from the numerical integration of the Ericksen-Leslie equation.

Details

Language :
English
ISSN :
00214922 and 13474065
Volume :
38
Issue :
12
Database :
Supplemental Index
Journal :
Japanese Journal of Applied Physics
Publication Type :
Periodical
Accession number :
ejs56135518
Full Text :
https://doi.org/10.1143/JJAP.38.6739