Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Optical excitation
Patent
1994-11-02
1997-03-18
Gross, Anita Pellman
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Optical excitation
349 30, 349 95, G02F 1135, G02F 11335
Patent
active
056128002
ABSTRACT:
A liquid crystal light valve is provided with an array of photoconductive pedestals surrounded by a dielectric matrix material. Metal mirror pads are formed on top of each pedestal to form a high resolution metal matrix mirror, with each pedestal/mirror combination servicing one image pixel. The dielectric matrix forms a potential barrier between the individual photoconductive pedestals which prevents lateral charge migration between pedestals. The metal matrix mirror also shields the underlying photoconductive pedestal from photoactivation by the readout beam. The dielectric matrix material has a lower dielectric constant than the photoconductive pedestals, allowing the impedance of the photoconductive pedestals to match the impedance of the liquid crystal layer with a much thinner layer of photoconductive material than in prior LCLVs using a continuous photoconductive layer. The thinner photoconductive layer results in higher electric fields which improve the LCLV's response time, photodegradation rate, spatial resolution and spectral response.
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Braatz Paul O.
Wu Chiung-Sheng
Denson-Low W. K.
Duraiswamy V. D.
Gross Anita Pellman
Hughes Aircraft Company
Ton Toan
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