PROJECTION TYPE DISPLAY DEVICE

PROBLEM TO BE SOLVED: To provide a projection type display device capable of easily reducing speckle noise when a light source having coherency is used.SOLUTION: The projection type display device for displaying an image by use of a light source having coherency includes a liquid crystal element com...

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Bibliographische Detailangaben
Hauptverfasser:	KOYANAGI ATSUSHI, KUMAI YUTAKA, KONISHI TEPPEI
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:	PROBLEM TO BE SOLVED: To provide a projection type display device capable of easily reducing speckle noise when a light source having coherency is used.SOLUTION: The projection type display device for displaying an image by use of a light source having coherency includes a liquid crystal element comprising a liquid crystal layer held between two light-transmitting substrates. The liquid crystal layer comprises a smectic phase liquid crystal having spontaneous polarization. The coherency is eliminated by temporally changing phases and/or polarization states of light transmitting through the liquid crystal layer by applying voltages on the liquid crystal layer, and thereby, speckle noise can be stably reduced.