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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Now showing 1 - 8 of 8

The Dynamics of Human Sperm Droplets on a Liquid Crystal and Polymer Composite Film
(2010-01-01)
Lu, Farn
;
Lin, Yi-Hsin
;
Tsai, Wan-Chen
;
Li, Jiong-Juan
;
Chu, Ting-Yu
A switchable surface using a liquid crystal and polymer composite film (LCPCF) based on phase separation between liquid crystals (LC) and polymers after photopolymerization is developed recently. The wettability of LCPCF is electrically tunable because of the orientation of liquid crystal directors anchored among the polymer grains under an in-planed electric field. A water droplet on the top of LCPCF can be manipulated under an inhomogeneous electric field on the LCPCF owning to the wettability gradient. The dynamics of a droplet of human sperms on the LCPCF is demonstrated as well. Three motions of sperm droplets are observed: the droplet collapse and the droplet stretch,. We found that the dynamics, concentrations, and activities of spermatozoa, affect the motions of a sperm droplet. The potential applications of LCPCF are polarizer-free displays, liquid lenses, and the microfluidic device in assisted reproductive technology (ART)
Simulation Study on Polarization-Independent Microlens Arrays Utilizing Blue Phase Liquid Crystals with Spatially-Distributed Kerr Constants
(2014-12-01)
Chen, Hung-Shan
;
Chen, Michael
;
Chang, Chia-Ming
;
Wang, Yu-Jen
;
Lin, Yi-Hsin
Polarization independent liquid crystal (LC) microlens arrays based on controlling the spatial distribution of the Kerr constants of blue phase LC are simulated. Each sub-lens with a parabolic distribution of Kerr constants results in a parabolic phase profile when a homogeneous electric field is applied. We evaluate the phase distribution under different applied voltages, and the focusing properties of the microlens arrays are simulated. We also calculate polarization dependency of the microlenses arrays at oblique incidence of light. The impact of this study is to provide polarizer-free, electrically tunable focusing microlens arrays with simple electrode design based on the Kerr effect.
Electrically Tunable Ophthalmic Lenses for Myopia and Presbyopia Using Liquid Crystals
(2014-06-13)
Chen, Hung-Shan
;
Chen, Ming-Syuan
;
Lin, Yi-Hsin
;
交大名義發表
;
光電工程學系
In this paper, an electrically tunable-focusing and polarizer-free liquid crystal (LC) lens for ophthalmic lenses is demonstrated. The optical operating principles of the LC lens in a human eye system are introduced and the optical principle of the polarization independent of the double-layered LC lens is investigated. The polarization dependency, image quality and the response time of the double-layered LC lens are measured. The continuously tunable-focusing properties of the LC lenses are more practical in applications for different visional conditions of people. The concept in this paper can also be extensively applied to imaging systems, and projection systems, such as cameras in cell phones, pico projectors, and endoscopes.
A concentrating photovoltaic system based on liquid crystal light modulation
(2013)
Tsou, Yu-Shih
;
Lin, Yi-Hsin
;
交大名義發表
;
光電工程學系
;
National Chiao Tung University
A concentrating photovoltaic (CPV) system with a steady electric output adopting an electrically tunable concentration ratio of the LC light modulation is demonstrated. The distribution of the LC directors of the LC light modulation can be controlled by an applied voltage in order to adjust the number of incident photons in an area. Therefore the system can be operated with an static and maximum output under different ambient illuminations because the LC light modulation helps to increase photocurrent at a low illumination and prevent the effect of the series resistance at a high illumination.
Flexible and reflective polarizer-free liquid crystal displays using dye-doped liquid crystal gels
(2008)
Lin, Yi-Hsin
;
Yang, Jhih-Ming
;
Jeng, Shie-Chang
;
Lin, Yan-Rung
;
Liao, Chi-Chang
A flexible and reflective polarizer-free display using dye-doped liquid crystal (LC) gels is demonstrated. The electro-optical performances of both scattering and absorption based dye-doped LC gels depend on curing temperatures. The dye-doped LC gel shows good reflectance similar to 55%, good contrast ratio similar to 450:1 and fast response similar to 6.5ms at curing temperature 10 degrees C when UV curing intensity is 2.6 mW/cm(2). The EO performance depends on the curing temperature. The hysteresis is independent of sampling time duration. The bending curvature is 21 mm. The response of dye-doped LC gels is faster under bending due to the bending-induced sheared force of polymer networks. The dye-doped LC gels open a new window for trimable electronic papers, decorative displays and switchable curtains.
Droplet manipulation on a liquid crystal and polymer composite film
(2010)
Lin, Yi-Hsin
;
Tsou, Yu-Shih
;
Chu, Ting-Yu
;
Chen, Jun-Lin
;
光電工程學系
A droplet manipulation on a switchable surface using a liquid crystal and polymer composite film (LCPCF) based on phase separation is developed recently. The wettability of LCPCF is electrically tunable because of the orientation of liquid crystal directors anchored among the polymer grains. A droplet on LCPCF can be manipulated owning to the wettability gradient induced by spatially orientation of LC directors. We discuss the droplet manipulation on LCPCF and demonstrate several applications of LCPCF, such as polarizer-free displays, and human semen sensing.
A Polarizer-Free Electro-Optical Switch Using Dye-Doped Liquid Crystal Gels
(2009-12-01)
Lin, Yi-Hsin
;
Lin, Hung-Chun
;
Yang, Jhih-Ming
;
光電工程學系
;
Department of Photonics
We demonstrate a polarizer-free electro-optical switch using dye-doped liquid crystal (LC) gels. The mechanism of dye-doped LC gels mainly involves the combination of polymer scattering and dye absorption. However, the domain size of polymer networks, dye concentration, LC concentration, and fabrication process can all affect the phase separation process and thus result in dye-doped LC gels with different electro-optical performance. We have studied experimentally the factors which can affect the dye-doped LC gels. The potential applications for dye-doped LC gels are flexible displays and electrically tunable light shutters.
Polarizer-Free Gradient Dye-Doped Liquid Crystal Gels
(2009)
Lin, Yi-Hsin
;
Yang, Chih-Ming
;
Lo, Chun-Hsiang
;
Lin, Yan-Rung
;
Jeng, Shie-Chang
A multi-switch display using gradient dye-doped LC gels which is still polarizer-free, fast response (similar to 10ms in general), and high contrast (similar to 200:1 in general) has demonstrated. By controlling the spatial distribution of the density of polymer networks through fabrication process, gradient dye-doped LC gels can be a multi-switch. The gradient dye-doped LC gel is bright without applied voltage and is dark at a high voltage. It appears the colored pattern when LCs are partially reoriented due to the gradient density of polymer networks. The optical analysis of dye-doped LC gels is also discussed. The potential applications are flexible display and decorative displays.

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