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Effects of viscosities on the transient current in homeotropic nematic liquid crystal cells |
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| Authors: | Yosuke Iwata Hiroyoshi Naito Masaru Inoue Melanie Klasen-Memmer |
| Affiliation: | a Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan b The Research Institute for Molecular Electronic Devises, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan c FPD Measurement System Project, TOYO Corporation, 1-1-6 Yaesu, Chuo-ku, Tokyo 103-8284, Japan d Liquid Crystals Division, Merck Ltd., 4084 Nakatsu, Aikawa, Kanagawa 243-0303, Japan e Liquid Crystals Division, Merck KGaA, Frankfurter Strasse 250-64293 Darmstadt, Germany |
| Abstract: | Effects of the Leslie viscosity coefficients αi (i = 1, 2, …, 5) of nematic liquid crystals (NLCs) with negative dielectric anisotropy (Δε < 0) on the electric-field-induced director reorientation in homeotropic NLC cells have been studied from the analysis of the transient current induced by step voltage application. The transient current in a homeotropic NLC cell with Δε < 0 was well reproduced by computer simulation, based on the theory of NLCs in which the flow effects and the free-slip boundary condition are taken into account. It is found that the response time of vertical alignment NLC displays is dominantly governed by α2 and α4 + α5 of NLCs with Δε < 0. |
| Keywords: | Nematic liquid crystal Viscosities Negative dielectric anisotropy Transient current Flow effects |
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