Spatial light modulator imaging systems

A spatial light modulator imaging system comprises an electrically addressed spatial light modulator (EASLM 4, 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...

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Bibliographische Detailangaben
Hauptverfasser:	HUGHES JONATHAN R, MILLER RICHARD J
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CINEMATOGRAPHY CRYPTOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DISPLAY EDUCATION ELECTROGRAPHY FREQUENCY-CHANGING HOLOGRAPHIC PROCESSES OR APPARATUS HOLOGRAPHY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHOTOGRAPHY PHYSICS SEALS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A spatial light modulator imaging system comprises an electrically addressed spatial light modulator (EASLM 4, 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 n 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.