Studies on key technologies for an energy-harvesting display

• Project/Area Number: 17K07032
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Energy engineering
• Research Institution: Ritsumeikan University
• Principal Investigator: Fujieda Ichiro 立命館大学, 理工学部, 教授 (90367996)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 蛍光 / 発電 / ディスプレイ / 自己吸収 / 光学効率 / 導光 / 液晶 / 再発光 / カラー画像表示 / コントラスト / スペクトル / 位置検出器 / 異方性 / 光線追跡 / 吸収確率分布 / 蛍光スペクトル / 配向 / 太陽光発電

Outline of Final Research Achievements

An energy-harvesting display displays images by projecting intensity-modulated excitation light on a luminescent solar concentrator (LSC). Its performance is limited by the self-absorption and re-emission events. We have proposed models to explain these phenomena. They are also applicable for an LSC. In addition, we have demonstrated a color energy-harvesting projector by utilizing three ceramic phosphors developed for LEDs. Its optical efficiency is approximately 1/4000 than that of an equivalent monochrome version. The use of a uniform organic layer suppresses light scattering events and we expect 3000-fold increase.

Academic Significance and Societal Importance of the Research Achievements

「発電するディスプレイ」は，室内の壁，建物の壁，看板，等へ搭載することで，快適でクリーンな社会の促進を目指すものである．本研究の主な成果はその設計論の確立である．従来の蛍光を利用する集光型太陽光発電（LSC）の分野ではモンテカルロ法や数値積分の手法を用いていたが，光学分野の類似の概念や効果的な近似を導入して，計算の負荷を低減すると共に，設計の適用対象を広げることができた．また，表示のカラー化を実証し，明所での視認性を改善できる可能性を示した．更に，例えば放射線治療の線量モニタのような従来にない応用について，基本的な動作原理を実証した．

Research Products

• [Journal Article] Concentric re-emission pattern from a planar waveguide with a thin uniform luminescent layer (2020)
  • Author(s): Matsumura Ryo、Tsutsumi Yasuhiro、Fujieda Ichiro
  • Journal Title: Applied Optics Volume: 59 Issue: 6 Pages: 1703-1710
  • DOI: 10.1364/ao.384323
  • Peer Reviewed / Open Access
• [Journal Article] Position-sensitive detectors based on redshifts in photoluminescence spectra (2019)
  • Author(s): Tsutsumi Yasuhiro、Matsumura Ryo、Ohta Masamichi、Fujieda Ichiro
  • Journal Title: Optical Engineering Volume: 58 Issue: 07 Pages: 077108-077108
  • DOI: 10.1117/1.oe.58.7.077108
  • Peer Reviewed / Open Access
• [Journal Article] Edge collection function: an analytical expression for the optical efficiency of an energy-harvesting device based on photoluminescence (2019)
  • Author(s): Fujieda Ichiro、Tsutsumi Yasuhiro、Yunoki Kohei、Yamada Yoshiki
  • Journal Title: Optical Engineering Volume: 58 Issue: 10 Pages: 104101-104101
  • DOI: 10.1117/1.oe.58.10.104101
  • Peer Reviewed / Open Access
• [Journal Article] Cross talk and optical efficiency of an energy-harvesting color projector utilizing ceramic phosphors (2019)
  • Author(s): Yunoki Kohei、Matsumura Ryo、Kohmoto Takamasa、Ohta Masamichi、Tsutsumi Yasuhiro、Fujieda Ichiro
  • Journal Title: Applied Optics Volume: 58 Issue: 36 Pages: 9896-9903
  • DOI: 10.1364/ao.58.009896
  • Peer Reviewed / Open Access
• [Journal Article] 28‐4: Fabrication and Operation of an Energy‐Harvesting Color Projector (2019)
  • Author(s): Fujieda Ichiro、Kohmoto Takamasa、Yunoki Kohei、Shigeta Mitsuhiro、Tsutsumi Yasuhiro
  • Journal Title: SID Symposium Digest of Technical Papers Volume: 50 Issue: 1 Pages: 394-397
  • DOI: 10.1002/sdtp.12940
• [Journal Article] Simple analytical model for optical efficiency of an energy-harvesting projector (2019)
  • Author(s): Fujieda Ichiro、Tsutsumi Yasuhiro、Yunoki Kohei、Yamada Yoshiki
  • Journal Title: Proc. of SPIE Volume: 11120 Pages: 17-17
  • DOI: 10.1117/12.2529064
• [Journal Article] Measurement of crosstalk in an energy-harvesting projector utilizing a uniform luminescent layer (2019)
  • Author(s): Ryo Matsumura, Yasuhiro Tsutsumi, Ichiro Fujieda
  • Journal Title: Proc. of 26th International Display Workshops Volume: 26 Pages: 742-745
• [Journal Article] A position sensitive detector based on red-shift in photoluminescence spectra (2018)
  • Author(s): Masamichi Ohta, Yasuhiro Tsutsumi, Ryo Matsumura, Ichiro Fujieda
  • Journal Title: Proc. of SPIE Volume: 10768 Pages: 24-24
  • DOI: 10.1117/12.2320057
• [Journal Article] Two-stage photoluminescence conversion for two-dimensional position sensing (2018)
  • Author(s): Yasuhiro Tsutsumi, Masamichi Ohta, Takamasa Kohmoto, Ryo Matsumura, Ichiro Fujieda
  • Journal Title: Proc. of SPIE Volume: 10768 Pages: 25-25
  • DOI: 10.1117/12.2320058
• [Journal Article] Proposal of energy-harvesting liquid crystal displays (2018)
  • Author(s): Mitsuhiro Shigeta, Ichiro Fujieda, Yasuhiro Tsutsumi
  • Journal Title: Proc. of 25th International Display Workshops Volume: 25 Pages: 218-221
• [Journal Article] Measurement of optical power recovered by planar fluorescent waveguides for single-spot excitation (2018)
  • Author(s): Ichiro Fujieda, Masamichi Ohta, Masahiko Okuyama, Yasuhiro Tsutsumi
  • Journal Title: Proc. of 25th International Display Workshops Volume: 25 Pages: 494-497
• [Journal Article] 発電するディスプレイ (2018)
  • Author(s): 藤枝一郎
  • Journal Title: 電波技術協会報FORN Volume: 320 Pages: 36-39
  • Peer Reviewed
• [Journal Article] Energy-harvesting laser phosphor display and its design considerations (2017)
  • Author(s): Ichiro Fujieda, Shunsuke Itaya, Masamichi Ohta, Yuuki Hirai, Takamasa Kohmoto
  • Journal Title: J. Photon. Energy Volume: 7 Issue: 2 Pages: 28001-28001
  • DOI: 10.1117/1.jpe.7.028001
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Angle-resolved photoluminescence spectrum of a uniform phosphor layer (2017)
  • Author(s): Fujieda Ichiro、Ohta Masamichi
  • Journal Title: AIP Advances Volume: 7 Issue: 10 Pages: 105223-105223
  • DOI: 10.1063/1.5000478
  • Peer Reviewed / Open Access
• [Journal Article] Angle-resolved measurement of photoluminescence spectra for illumination and display applications (2017)
  • Author(s): Masamichi Ohta, Ichiro Fujieda
  • Journal Title: Proceedings Frontiers in Optics 2017 Volume: - Pages: JTu2A.1-JTu2A.1
  • DOI: 10.1364/fio.2017.jtu2a.1
• [Journal Article] Phosphor screens for laser projection systems (2017)
  • Author(s): Takamasa Kohmoto, Masamichi Ohta, Ichiro Fujieda, Wataru Watanabe
  • Journal Title: Proceedings Frontiers in Optics 2017 Volume: - Pages: JTu2A.11-JTu2A.11
  • DOI: 10.1364/fio.2017.jtu2a.11
• [Journal Article] See-through phosphor screens for display applications (2017)
  • Author(s): Takamasa Kohmoto, Masamichi Ohta, Yuuki Hirai, Shintaro Ozawa, Ichiro Fujieda, Wataru Watanabe
  • Journal Title: Proc. of 24th International Display Workshops Volume: - Pages: 637-640
• [Journal Article] Light extraction from a laser-pumped phosphor layer with a remote reflector (2017)
  • Author(s): Masamichi Ohta, Ichiro Fujieda
  • Journal Title: Proc. of 24th International Display Workshops Volume: - Pages: 664-667
• [Presentation] 光線追跡による ECFモデルの検証 (2020)
  • Author(s): 杉浦 穂乃伽，堤 康宏，藤枝 一郎
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 有機蛍光色素を周期的に配置した導光体の発光特性 (2020)
  • Author(s): 松村 燎，岡 侑輝，佐藤 穂岳，堤 康宏，藤枝 一郎
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 蛍光色素を含む平面状の導光体の端面での光の収集効率の解析 (2020)
  • Author(s): 藤枝 一郎，堤 康宏
  • Organizer: 第67回応用物理学会春季学術講演会
• [Presentation] 発電機能を有するカラープロジェクタのクロストークの評価 (2019)
  • Author(s): 柚木康平，高本享昌，繁田光浩，堤康宏，藤枝一郎
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] 蛍光色素を用いた液晶ディスプレイの外光の下でのコントラスト比 (2019)
  • Author(s): 福本禄寿，太田正倫，繁田光浩，堤康宏，藤枝一郎
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] 山田啓貴，平井雄貴，太田正倫，堤康宏，藤枝一郎 (2019)
  • Author(s): 一様な蛍光体層を含む導光体の端面での光パワーの回収
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] 蛍光のスペクトル変化に基づく位置検出器の検出範囲の拡大 (2019)
  • Author(s): 松村燎，堤康宏，藤枝一郎
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] Spectral study of a side-emitting laser-pumped phosphor layer (2018)
  • Author(s): Masamichi Ohta, Ichiro Fujieda
  • Organizer: the 7th Laser Display and Lighting Conference
  • Int'l Joint Research
• [Presentation] 円筒状の媒体内を伝搬する蛍光のスペクトル変化に基づく位置検出 (2018)
  • Author(s): 松村燎，堤康宏，太田正倫，藤枝一郎
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] 一様な蛍光体層の配光特性から抽出した元の蛍光スペクトル (2018)
  • Author(s): 太田正倫，堤康宏，藤枝一郎
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] 一様な蛍光体層から放射される光の色度座標の角度依存性 (2018)
  • Author(s): 太田正倫，小澤慎太郎，藤枝一郎
  • Organizer: 第65回応用物理学会春季学術講演会，講演番号17p-B203-5
• [Presentation] 蛍光体層の近傍の反射層による蛍光スペクトルの変化 (2018)
  • Author(s): 小澤慎太郎，太田正倫，藤枝一郎
  • Organizer: 第65回応用物理学会春季学術講演会，講演番号17p-B203-6
• [Presentation] 異方性を有する媒体を伝搬する光の吸収に関する3次元モデル (2018)
  • Author(s): 藤枝一郎
  • Organizer: 第65回応用物理学会春季学術講演会，講演番号17p-B203-7
• [Presentation] Energy-harvesting laser phosphor display (2017)
  • Author(s): Masamichi Ohta, Shunsuke Itaya, Yuuki Hirai, Takamasa Kohmoto, Ichiro Fujieda
  • Organizer: the 6th Laser Display Conference (LDC’17)
  • Int'l Joint Research
• [Remarks] 発電するディスプレイ
  • URL: http://www.ritsumei.ac.jp/se/re/fujiedalab/enery_harvesting.pdf
• [Patent(Industrial Property Rights)] 位置検出器 (2018)
  • Inventor(s): 藤枝一郎，堤康宏
  • Industrial Property Rights Holder: 学校法人立命館
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2018-080259
  • Filing Date: 2018
• [Patent(Industrial Property Rights)] 表示装置 (2018)
  • Inventor(s): 藤枝一郎，繁田光浩
  • Industrial Property Rights Holder: 学校法人立命館
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2018-229069
  • Filing Date: 2018