Browsing by Author "Yang, Jhih-Ming"

Now showing 1 - 5 of 5

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.
A polarizer-free flexible and reflective electrooptical switch using dye-doped liquid crystal gels
(2008-02-04)
Lin, Yi-Hsin
;
Yang, Jhih-Ming
;
Lin, Yan-Rung
;
Jeng, Shie-Chang
;
Liao, Chi-Chang
A polarizer-free flexible and reflective electro-optical switch 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 due to domain sizes of polymer networks. Such flexible electro-optical switch is bendable and trim-able because of the vertical polymer networks and gel-like materials. The dye-doped LC gel shows good reflectance similar to 55%, good contrast ratio similar to 450: 1 and fast response similar to 6.4ms at curing temperature 10 degrees C. The bending curvature is 21 mm. The dye-doped LC gels open a new window for trim-able electronic papers, decorative displays, electrically switchable curtains, and electrically switchable sun control film for the automobiles, homes or commercial buildings.
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.
Flexible and reflective polarizer-free liquid crystal displays using dye-doped liquid crystal gels - art. no. 691108
(2008-01-01)
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.
Polarizer-free Liquid Crystal Displays
(2008)
Lin, Yi-Hsin
;
Yang, Jhih-Ming
;
Wu, Shin-Tson
;
Liao, Chi-Chang
;
光電工程學系
A reflective polarizer-free liquid crystal display (LCD) using dye-doped LC gels is demonstrated. The main mechanism is to combine dye absorption and polydomain scattering. The potential applications are electronic papers and flexible displays.