Liquid crystal light valve showing an improved display contrast
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United States of America Patent
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Sep 24, 1991
Grant Date -
N/A
app pub date -
Jan 19, 1990
filing date -
Jan 20, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optically-addressed liquid crystal light valve comprises a transparent insulating substrate having either one-dimensional or two-dimensional arrays of optical switching elements thereon which can perform switching with an incident light, another opposing transparent substrate having transparent electrodes and a liquid crystal sandwiched therebetween. Each of the light switching elements comprises a photo-detector circuit and a thin-film-transistor (TFT) drive circuit. The photo-detector circuit comprises a serially connected photodiode and a passive element such as capacitor or resistor. The TFT drive circuit receives as input the voltage produced from the photo-detector circuit, while the output voltage from the TFT drive circuit is applied to one pixel electrode for the liquid crystal.
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