Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2011-08-02
2011-08-02
Thompson, Timothy J (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S244000
Reexamination Certificate
active
07990600
ABSTRACT:
An optically addressed, photoconductive spatial light modulator (SLM) operates in a transmissive mode and is capable of modulating a wide spectrum of visible light. There is no pixel structure or native pixel resolution in the SLM. The SLM has no photodiodes and does not rectify. A light projection system (100) in which one or more SLMs (128, 130, 132) are placed includes a write (image definition) UV light path (102) and a read (illumination) visible light path (104) to form a color image projection display. The write UV light propagates from an image display pattern source (120) and either sequentially or continuously writes image patterns on the photoconductive SLMs. The read visible light propagates through the SLM and is modulated by an electro-optical material, the optical properties of which change in response to the image structure carried by the write light. The result is a high efficiency display system that delivers high resolution color images through a projection lens (190) onto a display screen.
REFERENCES:
patent: 2003/0081304 (2003-05-01), Harada et al.
patent: 2008/0211836 (2008-09-01), Stanley et al.
Brice Stephen E.
Goetz Howard V.
Keith David
Li Lin
Linn Steven H.
Compound Photonics Limited
McKenna Long & Aldridge LLP.
Thompson Timothy J
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