OPTICAL UNIT, PROJECTION DISPLAY APPARATUS, AND OPTICAL DIFFUSER

Disclosed is a projection display apparatus which is provided with: a light source (110) which emits light having coherency; a light modulation element (500), which modules the light emitted from the light source; and a projection unit (150) which projects, to a projection plane, the light emitted f...

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Bibliographic Details
Main Authors OKUDA MICHIHIRO, TANOHATA YUKI, OZAKI AZUSA
Format Patent
LanguageEnglish
Published 12.04.2012
Subjects
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
ELECTROGRAPHY
HOLOGRAPHY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHOTOGRAPHY
PHYSICS
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Summary:Disclosed is a projection display apparatus which is provided with: a light source (110) which emits light having coherency; a light modulation element (500), which modules the light emitted from the light source; and a projection unit (150) which projects, to a projection plane, the light emitted from the light modulation element. The projection display apparatus is also provided with a speckle noise reducing element (600) provided between the light source and the light modulation element, and a control unit which controls first mode and second mode. The control unit controls the speckle noise reducing element so that speckles are reduced in the first mode compared with those in the second mode.
Bibliography:Application Number: US201013376704