Browsing by Author "Fan-Chiang, KH"

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High-definition vertically aligned liquid crystal microdisplays using a circularly polarized light
(2005-07-18)
Fan-Chiang, KH
;
Chen, SH
;
Wu, ST
;
光電工程學系
;
Department of Photonics
A high-definition vertically aligned liquid crystal (LC) microdisplay exhibits a excellent contrast ratio, but its fringing field effect splits the bright state unevenly and leads to a very slow response time. By utilizing a circularly polarized light instead of conventional linearly polarized light, we have overcome the long-standing problems of poor sharpness, low brightness, and slow response time. Confirming computer simulations agree with the experimental results well. This approach can be applied to both reflective and transmissive LC microdisplays. (c) 2005 American Institute of Physics.
Tunable-focus cylindrical liquid crystal lenses
(2005-01-01)
Lin, YH
;
Ren, HW
;
Fan-Chiang, KH
;
Choi, WK
;
Gauza, S
Tunable-focus cylindrical liquid crystal lenses of four different electrode configurations are analyzed. Simulation results show that the proposed devices can have different focal lengths even if they have the same aperture size. A good agreement between experiment and simulation results is obtained. The imaging property of one,of the cylindrical liquid crystal lenses is also demonstrated.