PROJECTION DISPLAY DEVICE

A projection display device of the present invention comprises a light source, a DMD chip for modulating emitted light in response to an input signal, an illumination optical system for emitting light from the light source to the DMD chip, a projection lens for projecting light modulated by the DMD...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	KAWAMOTO NAOKI
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 ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	A projection display device of the present invention comprises a light source, a DMD chip for modulating emitted light in response to an input signal, an illumination optical system for emitting light from the light source to the DMD chip, a projection lens for projecting light modulated by the DMD chip onto a screen, and a photosensor disposed on an optical path of branch light which is branched outside of a main optical path from the light source to the screen, in the vicinity of a position which is optically conjugate to a screen surface of the screen. With this constitution, it is possible to provide a projection display device which is capable of accurately detecting a luminance change and a hue change on a screen surface without interfering with any display video image.