Browsing by Author "Yang, Chih-Ming"

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A polarizer-free flexible display using dye-doped liquid-crystal gels
(2009-10-01)
Lin, Yi-Hsin
;
Yang, Chih-Ming
;
Lo, Chun-Hsiang
;
Chen, Hung-Shan
;
Wu, Yung-Hsun
A reflective-type polarizer-free flexible display using a dye-doped liquid-crystal (LC) gels is demonstrated. Compared to the conventional guest-host LC mode, it has high contrast ratio and brightness due to the combining of both scattering and absorption. Such a gel-like flexible display is bendable and trimable. In this paper, a three-step switch using distinct dye-doped LC gels is also demonstrated. The potential applications are e-paper and decorative displays.
A polarizer-free three step switch using distinct dye-doped liquid crystal gels
(2009-04-06)
Lin, Yi-Hsin
;
Yang, Chih-Ming
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光電工程學系
;
Department of Photonics
A polarizer-free three step switch using distinct dye-doped liquid crystal (LC) gels is demonstrated in reflective mode. By controlling the spatial distribution of the density of polymer networks, the distinct dye-doped LC gels can produce multiple states: bright, dark, and information states without patterning indium-tin oxide. The multiple states are generated by adapting different polymer network density in different display regions. The dark state is due to the combination of scattering and absorption. It can be further extended for a four step switch. The potential applications are decorative displays, electrically tunable iris, and electrically tunable low pass or high pass filter.
A Polarizes-free Flexible Display Using Dye-doped Liquid Crystal Gels
(2008)
Lin, Yi-Hsin
;
Yang, Chih-Ming
;
Lin, Yan-Rung
;
Jeng, Shie-Chang
;
Liao, Chi-Chang
A reflective type polarizes-free flexible displays using a dye-doped liquid crystal (LC) is demonstrated due to combining both scattering and absorption. A polarizer-free multi-switch using gradient dye-doped LC gels is also demonstrated. Such a gel-like flexible displav is bendable and trimable. The potential applications are e-papers and decorative displays.
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.
Reflective type polarizer-free flexible displays using dye-doped nematic liquid crystal gels
(2008)
Lin, Yi-Hsin
;
Yang, Chih-Ming
;
Lin, Yan-Rung
;
Jeng, Shie-Chang
;
Liao, Chi-Chang
A polarizer-free flexible display using a dye-doped nemalic liquid crystal (LC) gel is demonstrated in reflective mode and transmissive mode. By mimicking the display principle of a paper, combing both scattering and absorption, such a bendable and trim-able LCD exhibits similar to 55% reflectance, similar to 450:1 contrast ratio in reflective mode, similar to 20:1 contrast ratio in transmisive mode, and 15 ms response time. A single pixel flexible reflective display using such dye-doped LC gels is also demonstrated under bending and cutting. The minimal bending radius of curvature is similar to 21 mm.