Optics: image projectors – Composite projected image – Multicolor picture
Patent
1997-01-14
2000-09-19
Dowling, William
Optics: image projectors
Composite projected image
Multicolor picture
353 37, G03B 2114
Patent
active
061201529
ABSTRACT:
A projection-type display apparatus includes a light source, a uniform illumination optical system, a color separating system for separating a white light beam emitted from the uniform illumination optical system into three color beams, three liquid crystal panels for respectively modulating each of the separated color beams, a light guide system located on an optical path of the color beam having the longest optical path among the separated color beams, a dichroic prism for synthesizing the beams modulated through the liquid crystal panels, and a projection lens for projecting the synthesized and modulated beam onto a screen. The uniform illumination optical system is provided with a uniform illumination optical device for converting the white light beam emitted from the light source into a uniform beam. Since the dichroic prism, which is an optical element that is rotationally symmetrical about the chief axis of a projection optical system, is employed as a color synthesizing system, and the uniform illumination optical device for restricting unevenness in color and luminous intensity is incorporated in the system, it is possible to realize a display apparatus which causes little unevenness in color and luminous intensity and which has a high illumination efficiency.
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Itoh Yoshitaka
Nakayama Tadaaki
Yajima Akitaka
Dowling William
Seiko Epson Corporation
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