Homogeneous Photoalignment of Liquid Crystals without Precoated Alignment Layers

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  • Kotera Koichi
    Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo
  • Kondo Mizuho
    Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo
  • Goto Kohei
    Nissan Chemical Inc.
  • Minami Satoshi
    Nissan Chemical Inc.
  • Sasaki Tomoyuki
    Department of Electrical Engineering, Nagaoka University of Technology
  • Noda Kohei
    Department of Electrical Engineering, Nagaoka University of Technology
  • Ono Hiroshi
    Department of Electrical Engineering, Nagaoka University of Technology
  • Kawatsuki Nobuhiro
    Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo

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<p>Homogeneously aligned liquid crystal (LC) cell was fabricated using nematic LCs (NLCs) doped with a polymerizable monomer comprising of photocrosslinkable mesogenic side groups, combined with the linearly polarized UV light exposure at elevated temperature. We have clarified that the photosensitive layer forms on the substrates via the thermal polymerization, followed by generating the NLC photoalignment based on the axis-selective photocrosslinking. The LC characteristics of the photosensitive side groups of the polymerizable material play an important role in the defect-free alignment for the NLCs.</p>

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