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Photoregulation of Liquid Crystal Alignment by Photochromic Molecules and Polymeric Thin Films

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Polymers as Electrooptical and Photooptical Active Media

Part of the book series: Macromolecular Systems — Materials Approach ((MACROSYSTEMS))

Abstract

Alignment of liquid crystal molecules is a key technology for applying the mesophases to display devices. Liquid crystal molecules are uniformly oriented by the action of substrate surfaces in display cells which are driven by the application of electric field to switch the director of liquid crystals. The alignment is essentially governed by the nature of substrate surfaces [1]. The modes of the alignment are roughly classified into two categories; homeotropic and planar states. In the former case, the long molecular axis of liquid crystals is arranged perpendicular to the substrate surface whereas liquid crystal molecules are oriented parallel to the surface in the latter. Homogeneous alignment refers to the unidirectional orientation of the molecular axis in the planar mode and displays birefringence with excellent optical quality. The conventional liquid crystal display devices work by switching of the alignment between homeotropic and homogeneous modes by the action of an applied electric field.

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Authors
  1. K. Ichimura
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Editors and Affiliations

  1. Chemistry Department, Moscow State University, 119899, Moscow B-234, Russia

    Valery P. Shibaev

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© 1996 Springer-Verlag Berlin Heidelberg

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Ichimura, K. (1996). Photoregulation of Liquid Crystal Alignment by Photochromic Molecules and Polymeric Thin Films. In: Shibaev, V.P. (eds) Polymers as Electrooptical and Photooptical Active Media. Macromolecular Systems — Materials Approach. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-79861-0_4

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  • DOI: https://doi.org/10.1007/978-3-642-79861-0_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-79863-4

  • Online ISBN: 978-3-642-79861-0

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