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Development of a novel bistable liquid crystal device with a microscale alignment pattern

Research Project

Project/Area Number 16K04934
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Applied materials
Research InstitutionAkita Prefectural University

Principal Investigator

HONMA MICHINORI  秋田県立大学, システム科学技術学部, 准教授 (90325944)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords液晶 / マイクロラビング / 双安定液晶素子 / 双安定 / ディスプレイ
Outline of Final Research Achievements

We discussed the condition for bistability, the realizable LC molecular orientation states, and the possible transition process in the bistable twisted nematic liquid crystal (LC) cells with microscale alignment patterns. First, we investigated the best combination of the two microrubbing patterns of a pair of substrates. We found an optimum LC layer thickness so that the elastic energies in the stable and metastable states were equal. Furthermore, LC molecular orientation models in the stable and metastable states were proposed. The relationship between the elastic energies in the two states and the LC layer thickness was evaluated theoretically. Finally, the hybrid-aligned-nematic LC cells with the two-dimensional orientation patterns were introduced. As a result, we demonstrated a bistable LC molecular orientation state via an appropriate voltage application and thermal processes.

Academic Significance and Societal Importance of the Research Achievements

近年急速に普及しているスマートフォンやタブレットなどの携帯型端末機器は,災害時や緊急時における重要な情報伝達および情報入手ツールとなり得るが,このような用途においては,低消費電力で長時間駆動できる双安定表示デバイスが有用である。本研究では,マイクロパターン配向を導入することによって高い安定性を有する双安定液晶デバイスの実現に向けた基礎特性の考察を行った。本研究によって,双安定性が得られる具体的な素子条件が明らかとなった。この研究成果によって,通常の液晶デバイスにマイクロパターン配向を適用することによる色相スイッチングデバイスの実現の可能性が見いだされた。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (7 results)

All 2020 2019 2018 2017 2016

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Acknowledgement Compliant: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Optical properties of two-dimensional liquid-crystal gratings fabricated by microrubbing and their application to Stokes polarimetry2019

    • Author(s)
      Honma Michinori、Nose Toshiaki
    • Journal Title

      Proceedings of SPIE

      Volume: 10941 Pages: 25-25

    • DOI

      10.1117/12.2515508

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Simple Stokes polarimeter using a liquid crystal grating with ternary orientation domains2018

    • Author(s)
      Michinori Honma, Natsuki Takahashi, and Toshiaki Nose
    • Journal Title

      Applied Optics

      Volume: 57 Issue: 35 Pages: 10183-10190

    • DOI

      10.1364/ao.57.010183

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 広がるマイクロパターン液晶デバイスの魅力2017

    • Author(s)
      本間道則,能勢敏明
    • Journal Title

      液晶

      Volume: 21 Pages: 361-364

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bistable liquid crystal device fabricated via microscale liquid crystal alignment2016

    • Author(s)
      Michinori Honma, Wataru Toyoshima, and Toshiaki Nose
    • Journal Title

      Journal of Applied Physics

      Volume: 120 Issue: 14 Pages: 143105-143105

    • DOI

      10.1063/1.4964746

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] 微細な配向処理パターンを有するハイブリッド配向液晶セルにおける双安定特性2020

    • Author(s)
      本間道則, 能勢敏明
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Bistability in Liquid Crystal Gratings with Three Orientation Domains2019

    • Author(s)
      Michinori Honma and Toshiaki Nose
    • Organizer
      Optics of Liquid Crystals
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Optical properties of two-dimensional liquid-crystal gratings fabricated by microrubbing and their application to Stokes polarimetry2019

    • Author(s)
      Michinori Honma and Toshiaki Nose
    • Organizer
      Photonics West 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2021-02-19  

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