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http://dx.doi.org/10.4313/JKEM.2006.19.3.260

Simulation of Liquid Crystals Considering Flow Effect  

Kim Hoon (인하대학교 전자공학과)
Park Woo-Sang (인하대학교 전자공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.19, no.3, 2006 , pp. 260-266 More about this Journal
Abstract
In this paper, We coupled fluid balance and director balance equation from Ericksen-Leslie's continuum theory and observed the motion of Liquid Crystal molecular. We simulated flow velocity and director distribution in which flow effect is considered in switching on and switching off state. We interpreted the dynamic response characteristic caused by the flow. As the result of the simulation, We could see the flow effect. In the case of Twisted Nematic(TN) cell, this flow caused abnormal twist temporarily in switching off state. We could prove that this abnormal twist is a direct cause of optical bounce phenomenon known well until now with the result of simulation. In addition, We analyzed the mechanism of the fast response due to flow in the case of Optically Compensated Bend(OCB) cell.
Keywords
Flow effect; Twisted nematic(TN); Optically compensated bend(OCB); Dynamic response;
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  • Reference
1 D. W. Berreman, 'Liquid crystal twist cell dynamics with backflow', J. Appl. Phys., Vol. 46, No.9, p. 3746, 1975
2 J. Kelly, S. Jamal, and M. Cui, 'Simulation of the dynamics of twisted nematic devices including flow', J. Appl. Phys., Vol. 86, No. 8, p. 4091, 1999
3 Y. Yamaguchi, T. Miyashita, and T. Uchida, 'Wide viewing angle display mode for the active-matrix LCD using bend-alignment liquid crystal cell', Proc. SID '93 Digest, Seattle, USA, p. 277, 1993
4 S. Onda, T. Miyashita, and T. Uchida, 'Dynamic behavior of OCB-cell with fast response for a color sequential liquid crystal display', Asia Display Proc. '98 IDRC, Seoul, Korea, 1993
5 S. Dickmann, J. Eschler, O. Cossalter, and D. A. Mlynski, 'Simulation of LCDs including elastic anisotropy and inhomogeneous field', Proc. SID '93 Digest, Seattle, USA, p. 638, 1993
6 P. G. de Gennes, 'The Physics of Liquid Crystal', Clarendon, Oxford, U. K., 1974
7 D. W. Berreman, 'Optics in stratified and anisotropic media: 4x4 matrix formulation', J. Opt. Soc. Am., Vol. 62, No.4, p. 502, 1972
8 D. W. Berreman, 'Dynamics of liquid crystal twist cells', Appl. Phys. Lett., Vol. 25, No.1, p. 12, 1974
9 C. Z. van Doorn, 'Dynamic behavior of twisted nematic liquid crystal layer in switched fields', J. Appl. Phys., Vol. 46, No. 9, p. 3738, 1975
10 M. Schadt and W. Helfrich, 'Voltage dependence optical activity of a twisted nematic liquid crystal', Appl. Phys. Lett., Vol. 18, No.4, p. 127, 1971