Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-04-24
1993-01-05
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359100, G02F 1135
Patent
active
051776286
ABSTRACT:
A self-powered liquid crystal spatial light modulator is disclosed having a pair of spaced transparent glass plates, on each plate of which a transparent electrically conductive film is coated so as to be in confronting relation. A voltage/current generating, photovoltaic/photodiode, light sensitive layer is coated onto one of the conductive films. A liquid crystal layer is confined between the other conductive film and the light sensitive layer. A shorting circuit element connects the two conductive films. This shorting circuit element may be internal or external to the spatial light modulator. A pixel area of the spatial light modulator is addressed by a beam of light that illuminates the pixel area and operates to activate a corresponding area of the light sensitive layer. The voltage/current that is generated in this area of the light sensitive film causes a current to flow through the shorting circuit element, to thereby activate, switch or charge the corresponding area of the liquid crystal layer. Transmission mode and reflection mode spatial light modulators are described.
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"Photoaddressing of High Speed Liquid Crystal Spatial Light Modulators", by Garret Moddel, Kristina Johnson, Mark A. Handschy, Proceedings of SPIE--The International Society for Optical Engineering, vol. 754, 13-15, Jan. 1987, pp. 207-212.
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Hancock Earl C.
Sikes William L.
Sirr Francis A.
The University of Colorado Foundation Inc.
Trice Ron
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