Browsing by Author "Chiang, KHF"

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Diffraction effect on high-resolution liquid-crystal-on-silicon devices
(2005-05-01)
Chiang, KHF
;
Chen, SH
;
Wu, ST
;
光電工程學系
;
Department of Photonics
We extend the beam propagation method to calculate light propagation in reflective liquid crystal displays. The effect of diffraction on the optical performance of high-resolution liquid-crystal-on-silicon devices is investigated. The light efficiencies are simulated with respect to the pixel pitch for the vertically aligned and finger-on-plane modes. Computer simulation results indicate that the effect of diffraction on these devices is significant.
Fringing field effect of the liquid-crystal-on-silicon devices
(2002-07-01)
Chiang, KHF
;
Wu, ST
;
Chen, SH
;
光電工程學系
;
Department of Photonics
The fringing field has an important effect on the contrast ratio of liquid-crystal-on-silicon (LCOS) display devices. Computer simulation results of five commonly employed LC operating modes are compared: mixed-mode twisted nematic (MTN) cell, 45degrees twisted nematic cell, vertical alignment (VA) cell, film-compensated homogeneous cell, and fringe-field switching cell. The slope of the pixel electrodes is found to make an important contribution to the brightness and contrast ratio of each mode. Simulation results indicate that the VA mode has the best contrast ratio when all the pixels are on and off. However, the MTN cell shows the smallest fringing field effect when alternating pixels are switched on and off.