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Control of the Polymer Aggregation Structure in Polymer Dispersed Liquid Crystals by using Anisotropically Diffused UV Light and its Application to the Light Distribution Control Devices

Research Project

Project/Area Number 16K06289
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionTohoku University

Principal Investigator

ISHINABE Takahro  東北大学, 工学研究科, 准教授 (30361132)

Co-Investigator(Kenkyū-buntansha) 藤掛 英夫  東北大学, 工学研究科, 教授 (20643331)
柴田 陽生  東北大学, 工学研究科, 助教 (70771880)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords液晶 / 高分子分散型液晶 / 高分子凝集構造 / 光拡散分布 / 紫外線光源 / 光重合相分離 / 視野角制御ディスプレイ / 液晶ディスプレイ / 光拡散フィルム / 相分離構造 / 高分子層構造 / 視野角制御型ディスプレイ / モノマー / 相分離 / 配光制御
Outline of Final Research Achievements

We have established a method to control the polymer aggregation structure in polymer dispersed liquid crystals (PDLCs) by irradiating them with uni-directionally diffused UV light. We clarified that the layer structured PDLCs with alternating striped LCs/polymer pattern could be obtained by irradiating them with UV light in isotropic phase.
We also proposed a method to control 2 dimensional distribution of the polymer structure by using micro-lens. The micro-lens produced an uneven illuminance distribution of UV light in the LC-monomer mixture, and that the monomer was polymerized along the direction of UV light irradiation and formed high density layered structure.
The proposed PDLCs could electrically control the light diffusion distribution and had a high diffusion efficiency without polarization dependency in the haze value. We successfully achieved viewing angle controllable liquid crystal display with high light utilization efficiency.

Academic Significance and Societal Importance of the Research Achievements

本研究は、液晶/モノマー混合系において光重合により形成される高分子凝集構造を、紫外線光源の配光分布を用いて制御する新たな高分子構造制御技術を確立し、高分子分散型液晶の高分子凝集構造とその二次元分布を制御することで、動的な配光制御を実現した。
本研究成果による紫外線の指向性と相分離メカニズムの解明は、精密な光制御に関する学術分野において重要な知見であり、複雑な光学系を用いず大面積での光制御を可能とすることから、スマートウィンドウ(電子調光窓)や光利用効率が高い低電力ディスプレイ、高い機能性を有する照明技術等、省エネルギーで人と環境に優しいエレクトロニクスの創出に貢献することができる。

Report

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

    (11 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Journal Article] Light distribution control of layer-structured PDLC fabricated by using micro lens structure and anisotropically diffused UV light2019

    • Author(s)
      Takahiro Ishinabe, Yuya Horii, Yosei Shibata, Hideo Fujikake
    • Journal Title

      Optics Express

      Volume: 27 Issue: 9 Pages: 13416-13429

    • DOI

      10.1364/oe.27.013416

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Polymer Distribution Control of Polymer-Dispersed Liquid Crystals by Uni-Directionally Diffused UV Irradiation Process2018

    • Author(s)
      Yuya Horii, Yosei Shibata, Takahiro Ishinabe, Hideo Fujikake
    • Journal Title

      IEICE Transactions on Electronics

      Volume: E101.C Issue: 11 Pages: 857-862

    • DOI

      10.1587/transele.E101.C.857

    • ISSN
      0916-8524, 1745-1353
    • Year and Date
      2018-11-01
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Diffused light control by layer-structured PDLC for future viewing angle controllable display applications2019

    • Author(s)
      Takahiro Ishinabe, Yuya Horii, Yosei Shibata, Hideo Fujikake
    • Organizer
      International Conference on Display Technology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Light Distribution Control by Layer-structured PDLC Fabricated by Using Anisotropically Diffused UV Light2019

    • Author(s)
      Takahiro Ishinabe, Yuya Horii, Yosei Shibata, Hideo Fujikake
    • Organizer
      Photonics & Electromagnetics Research Symposium
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 紫外線の指向性照射で形成されたPDLCの高分子構造分布の評価2018

    • Author(s)
      堀井勇哉、石鍋隆宏、柴田陽生、藤掛英夫
    • Organizer
      2018年日本液晶学会討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Structured PDLCs for Controlling LCD Viewing-Angle2018

    • Author(s)
      Takahiro Ishinabe, Yuya Horii, Yosei Shibata, Hideo Fujikake
    • Organizer
      Society for Information Display International Symposium
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Formation Mechanism of Polymer Layered Structure in Polymer-Dispersed LCs with Anisotropic UV irradiation2018

    • Author(s)
      Yuya Horii, Takahiro Ishinabe, Yosei Shibata, Hideo Fujikake
    • Organizer
      International Display Workshops
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Internal Polymer Structure Control of PDLC by Anisotropically Diffused UV light2018

    • Author(s)
      Yuya Horii, Takahiro Ishinabe, Yosei Shibata, Hideo Fujikake
    • Organizer
      27th International Liquid Crystal Conference (ILCC2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 配光可変型光拡散液晶フィルムの光拡散分布と内部構造の評価2017

    • Author(s)
      堀井勇哉, 西澤真裕, 柴田陽生, 石鍋隆宏, 藤掛英夫
    • Organizer
      第64回応用物理学会春季学術講演会
    • Place of Presentation
      パシフィコ横浜(横浜)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] 指向性UV 光源を用いたPDLC の高分子構造分布の制御2017

    • Author(s)
      堀井勇哉、柴田陽生、石鍋隆宏、藤掛 英夫
    • Organizer
      2017 年電子情報通信学会エレクトロニクスソサイエティ大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Formation of Layered Polymer Structure of PDLC by Anisotropically Diffused UV Irradiation2017

    • Author(s)
      Y. Horii, Y. Shibata, T. Ishinabe, H. Fujikake
    • Organizer
      International Display Workshops
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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