研究者詳細 - 佐々木　詩月

佐々木　詩月（ササキ　シヅキ）

Sasaki, Shizuki

写真a

所属（所属キャンパス）: 先端研究教育連携スクエア新川崎先端研究教育連携スクエア（三田）

職名: 特任講師（有期）

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経歴【表示／非表示】

2021年04月

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2023年03月

慶應義塾大学グローバルリサーチインスティテュート, 慶應フォトニクス・リサーチ・インスティテュート, 学生所員
2021年10月

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2023年03月

慶應義塾大学大学院理工学研究科, 科学技術振興機構（JST）博士後期課程学生支援プロジェクト, 支援対象学生
2023年04月

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2026年03月

慶應義塾大学, 慶應フォトニクス・リサーチ・インスティテュート, 特任助教
2026年04月

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継続中

慶應義塾大学, 慶應フォトニクス・リサーチ・インスティテュート, 特任講師

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学歴【表示／非表示】

2015年04月

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2019年03月

慶應義塾大学, 理工学部, 物理情報工学科

大学, 卒業
2019年04月

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2020年09月

慶應義塾大学, 理工学研究科, 総合デザイン工学専攻

大学院, 博士前期
2020年09月

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2023年03月

慶應義塾大学, 理工学研究科, 総合デザイン工学専攻

大学院, 修了, 博士後期

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博士（工学）, 慶應義塾大学, 課程, 2023年03月

リアルカラーディスプレイのためのランダム偏光フィルムの設計および特性評価

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論文【表示／非表示】

Improving Image Quality with Surface-Treated Random Depolarization Films

Sasaki S., Koike Y.

Digest of Technical Papers SID International Symposium 56 （ 1 ） 928 - 931 2025年

ISSN 0097966X

　概要を見る

Our random depolarization film (RDF) randomizes polarization by birefringent dopant particles, thereby resolving color degradation of displays. To further improve image quality with RDFs, this paper designs the RDF with surface treatments. The RDF achieved practical contrast ratios with anti-reflection treatment and sharp images by utilizing directional forward light scattering. Therefore, the designed RDF has high practicality for existing displays and effectiveness in realizing real-color displays.
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Randomizing polarization of displays for fundamental improvement of color mura caused by birefringence

Sasaki S., Koike Y.

Optics letters 49 （ 22 ） 6501 - 6504 2024年11月

ISSN 01469592

　概要を見る

Most existing displays utilize polarization technologies to produce images and improve image quality. However, polarized light from displays causes color mura because of the birefringence of the polymer films used. Thus, eliminating color degradation remains a challenge despite the incorporation of complex polarization technologies such as retardation films. Our proposed random depolarization film (RDF) addresses this issue by randomizing the polarization of light from displays. Chromaticity measurements demonstrate that the RDF effectively compensates for color mura due to low-cost polymer films. Notably, the RDF compensation mechanism is independent of the RDF position and light source spectrum. Therefore, the RDF could be an innovative solution for color degradation in existing displays.
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Random depolarization film design based on modulation transfer function measurements of displays with different pixel pitches

Sasaki S., Masaoka K., Koike Y.

Applied Optics 63 （ 11 ） 2900 - 2905 2024年04月

ISSN 1559128X

　概要を見る

Polarized light emitted frommost displays causes blackout and color change problems when viewed through polarized sunglasses. These problems are addressed by random depolarization films (RDFs) doped with birefringent particles. These dopant particles, however, scatter light and degrade the sharpness of the displayed images.To maintain the image sharpness, we designed an RDF based on modulation transfer function measurements of displays with different pixel pitches. RDFs doped with larger particles achieved higher modulations; however, particles larger than a specific size caused undesirable sparkles on the displayed image. A display with a larger pixel pitch achieved higher modulations, suggesting that the RDF is particularly suitable for large-screen displays.
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Proposal of Novel Random Depolarization Film for Real-Color Displays with Sharp Images

Sasaki S., Koike Y.

Digest of Technical Papers - SID International Symposium 55 （ 1 ） 425 - 428 2024年

ISSN 0097966X

　概要を見る

The random depolarization film (RDF), a polymer film doped with birefringent particles, converts linearly polarized light to randomly polarized light. This paper shows that a novel RDF with controlled birefringence resolves polarization problems of the display such as blackout, color change, and color mura problems. Furthermore, the novel RDF achieved a higher contrast ratio and a sharper image than a conventional RDF doped with calcite particles.
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Design of Random Depolarization Films Based on Modulation Transfer Function Measurements

Sasaki S., Masaoka K., Koike Y.

Digest of Technical Papers - SID International Symposium 54 （ 1 ） 547 - 550 2023年

ISSN 0097966X

　概要を見る

The random depolarization film (RDF), a polymer film doped with birefringent microparticles, solves polarization problems of displays. To design the RDF that realizes sharper images, the optimal dopant particle size and suitable display’s pixel size were investigated based on modulation transfer function (MTF) measurements. The MTFs indicated that the dopant particle size of the RDF and the pixel size of the display should be larger to prevent the sharpness degradation.
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