Computer graphics processing and selective visual display system – Plural physical display element control system – Optical means interposed in viewing path
Reexamination Certificate
2005-08-09
2005-08-09
Epps, Georgia (Department: 2873)
Computer graphics processing and selective visual display system
Plural physical display element control system
Optical means interposed in viewing path
C345S087000, C345S204000, C359S244000, C359S259000, C349S025000
Reexamination Certificate
active
06927748
ABSTRACT:
A spatial light modulator imaging system comprises an electrically addressed spatial light modulator (EASLM4, 30) whose optical image output is projected onto different areas of an optically addressed spatial light modulator (OASLM,6, 8, 31) in a sequence. The OASLM carries electrodes which allow separate areas to be selectively addressed by application of a voltage whilst receiving light from the EASLM. The combined output from all areas of the OASLM forms a visible image to an observer (11). When illuminated by coherent light the OASLM may produce a holographic image, otherwise incoherent light is used to provide a two dimensional image. The OASLM in one example contains a layer of nematic liquid crystal material between two cell walls both treated with an alignment layer providing low tilt surface alignment that is parallel in opposite direction; the product of layer thickness d and material birefringence Δn approximately equals one quarter of the wavelength λ of read light (12, 37). Other types of nematic devices may also be used, with cell parameters arranged to give enhanced diffraction efficiency.
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Hughes Jonathan R
Miller Richard J
Dinh Jack
Epps Georgia
Holographic Imaging LLC
Nixon & Vanderhye P.C.
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