A polarisation separation element, a polarisation conversion system, an optical element, and a projection display system

The present invention provides a polarisation separation element comprising a first array of prisms (20) having a wedge-shaped cross-section, and a second array of prisms (21) also having a wedge-shaped cross section. One of the prism arrays is an array of birefringent prisms. The present invention...

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Bibliographische Detailangaben
Hauptverfasser:	BOURHILL, GRANT, TAKATSUKA, TAMOTSU, HARA, MASAHARU, WALTON, EMMA JANE, WOODGATE, GRAHAM JOHN, SLACK, JASON, MITANI, KEISUKE, INOKO, KAZUHIRO, KHAZOVA, MARINA VLADIMIROVNA
Format:	Patent
Sprache:	eng ; fre ; ger
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:	The present invention provides a polarisation separation element comprising a first array of prisms (20) having a wedge-shaped cross-section, and a second array of prisms (21) also having a wedge-shaped cross section. One of the prism arrays is an array of birefringent prisms. The present invention also provides a polarisation conversion system having a polarisation separation element (16) of the above type for directing light having a first polarisation in a first direction and for directing light having a second polarisation different from the first polarisation in a second direction different from the first direction; and one or more polarisation conversion elements (19a,19b) for converting light having the first and second polarisations to light having a substantially common output polarisation. The polarisation conversion system of the invention is suitable for use in a projection display system.