Effect of the Rubbing Fabric for Surface Liquid Crystal Alignment on Various Orientation Films

D.-S. Seo Division of Electronic and Information Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24- 16 Nakamachi, Koganei, Tokyo, 184, Japan; Liquid Crystal Institute, Kent State University, Kent, Ohio, 44242, USA

S. Kobayashi Division of Electronic and Information Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24- 16 Nakamachi, Koganei, Tokyo, 184, Japan

M. Nishikawa Division of Electronic and Information Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24- 16 Nakamachi, Koganei, Tokyo, 184, Japan; Tokyo Research Laboratory, Japan Synthetic Rubber Co. Ltd., 3-5-1 Higashi-Yurigaoka, Asao-ku, Kawasaki, Kanagawa, 215, Japan

E.-J. Hahn Division of Electronic and Information Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24- 16 Nakamachi, Koganei, Tokyo, 184, Japan; Department of Physics, The University of Suwon, Kyungki, 445-743, Korea

Y. Yabe Division of Electronic and Information Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24- 16 Nakamachi, Koganei, Tokyo, 184, Japan; Display Development Engineering Department, Display Systems Engineering Division, Fujitsu Kiden Co. Ltd., 1776 Yanokuchi, Inagi, Tokyo, 206, Japan

Abstract

We have studied the effect of the rubbing fabric for pretilt angle generation, polar anchoring strength (energy), and the surface order parameter in nematic liquid crystals (NLC), 4-cyano-4′-n-penthylbiphenyl (5CB), on rubbed polyimide (PI) surfaces. The pretilt angle of 5CB for nylon and rayon fabric is larger than that of cotton fabric in weak rubbing on rubbed PI surfaces. The polar anchoring energy and surface order parameter of 5CB for nylon fabric are larger than those of cotton fabric on rubbed PI surfaces. We suggest that the polar anchoring energy and surface order parameter of 5CB increase with hard rubbing fabric. Finally, we conclude that the polar anchoring energy of 5CB is strongly related to the surface order parameter on rubbed PI surfaces.

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Effect of the Rubbing Fabric for Surface Liquid Crystal Alignment on Various Orientation Films

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Effect of the Rubbing Fabric for Surface Liquid Crystal Alignment on Various Orientation Films

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