Alignment of Nematic Liquid Crystal(5CB) on the Treated Substrates: Characterization of Orientation Films, Generation of Pretilt Angles, and Surface Anchoring Strength

Dae-Shik Seo, H. Matsuda, T. Oh-Ide, S. Kobayashi

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51 Citations (Scopus)

Abstract

This article provides a review on the experimental aspects of the alignment of nematic liquid crystal (NLC) in the pretilted homogeneous form in the sandwich cells; most of the contents of this paper are the results of research done by the authors in these few years. For simplicity and convenience, we used nematic liquid crystal (5CB) only; however, we have explored several polymer orientation films such as alkylbranched or alkylbranchless polyimide (PI), PI-Langmuir-Blodgett (LB) films, and those of polypyrrole. All these films were rubbed prior to assemble the cells except for some cases of PI-LB films. These films were characterized in terms of the atomic force microscope (AFM) observation and the optical retardation that are induced by the rubbing or unidirectional pulling up of the substrates in the LB process. Aligning capabilities of these orientation films for 5CB have been evaluated in terms of the texture of the NLC media, generation of pretilt angles, and temperature dependence of the anchoring strength (energies). Some results of this investigation is thought to partially contribute to provide several practical techniques for LCD technologies and to have some understanding the complicated surface anchoring phenomena.

Original languageEnglish
Pages (from-to)13-31
Number of pages19
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume224
Issue number1
DOIs
Publication statusPublished - 1993 Jan 1

Fingerprint

Nematic liquid crystals
liquid crystals
alignment
polyimides
Polyimides
Langmuir Blodgett films
Substrates
Langmuir-Blodgett films
Surface phenomena
pulling
polypyrroles
Polypyrroles
cells
Liquid crystal displays
Polymers
Microscopes
textures
Textures
microscopes
temperature dependence

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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abstract = "This article provides a review on the experimental aspects of the alignment of nematic liquid crystal (NLC) in the pretilted homogeneous form in the sandwich cells; most of the contents of this paper are the results of research done by the authors in these few years. For simplicity and convenience, we used nematic liquid crystal (5CB) only; however, we have explored several polymer orientation films such as alkylbranched or alkylbranchless polyimide (PI), PI-Langmuir-Blodgett (LB) films, and those of polypyrrole. All these films were rubbed prior to assemble the cells except for some cases of PI-LB films. These films were characterized in terms of the atomic force microscope (AFM) observation and the optical retardation that are induced by the rubbing or unidirectional pulling up of the substrates in the LB process. Aligning capabilities of these orientation films for 5CB have been evaluated in terms of the texture of the NLC media, generation of pretilt angles, and temperature dependence of the anchoring strength (energies). Some results of this investigation is thought to partially contribute to provide several practical techniques for LCD technologies and to have some understanding the complicated surface anchoring phenomena.",
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