Optical device for projection display

An optical device which is suitable for use in a projection display comprises a spatial light modulator 40, such as a liquid crystal device, with a microlens array 42 disposed on its front surface. The microlenses 58 are of convergent type, such as lenticules. The spatial light modulator is of the r...

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Bibliographische Detailangaben
Hauptverfasser:	GRAHAM JOHN WOODGATE, DUNCAN JAMES ANDERSON, JASON SLACK, MARINA VLADIMIROVNA KHAZOVA
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY 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 ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY FREQUENCY-CHANGING HOLOGRAPHY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	An optical device which is suitable for use in a projection display comprises a spatial light modulator 40, such as a liquid crystal device, with a microlens array 42 disposed on its front surface. The microlenses 58 are of convergent type, such as lenticules. The spatial light modulator is of the reflective type and comprises a plurality of rear reflectors 59, each of which has convergent optical power in at least one direction. The reflectors 59 are arranged such that, for a given direction of illumination, each reflector 59 forms an image of the aperture A of a microlens on the aperture B of another microlens or at a different position on the same microlens. When used in, for example, a projection display, light losses caused by vignetting are reduced.