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US 2011/0234982 A1Published application
Projection display
OwnerKoji HIRATA, Masahiko Yatsuinventors
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Abstract
A projection type image display apparatus is provided which includes a housing to hold an optical system including multi-lenses, a polarized-light conversion element and a color separation portion. The housing operates to provide an optical path between a light source, located outside the housing, and penetration-type image display elements and an optical synthesizing portion also located outside of the housing.
Claims7
A projection-type image display apparatus, comprising the following in a housing thereof:
- a light source;
- a lighting optical system;
- penetration-type image display elements configured for use of R-color, G-color and B-color;
- an optical synthesizing portion;
- and
- a projection lens, wherein:
- said projection-type image display elements configured for use of the R-color, G-color and B-color are attached with a cross dichroic prism, which constructs said optical synthesizing portion, in one body, on optical surfaces thereof differing from each other,
- said cross dichroic prism attached with said image display elements can be freely and detachably attached, so that an emission surface differing from the surfaces, on which said image display elements are attached, opposes to an incident surface of said projection lens, and also a reflection-type polarizing plate and an absorption-type polarizing plate are disposed, sequentially, between the emission surface of said cross dichroic prism and the incident surface of said projection lens, from the emission surface of said cross dichroic prism, opposing to said cross dichroic prisms, and
- the degree of polarization of said reflection=type polarizing plate is larger than that of said absorption-type polarizing plate.
6 more elements
A projection-type image display apparatus, comprising the following is a housing thereof:
- a light source;
- a lighting optical system;
- penetration-type image display elements configured for use of R-color, G-color and B-color;
- an optical synthesizing portion;
- and
- a projection lens, wherein:
- said penetration-type image display elements configured for use of the R-color, G-color and B-color are, at least, attached with a cross dichroic prism, which constructs said optical synthesizing portion, in one body together with said cross dichroic prism, on optical paths opposing surfaces of said cross dichroic prism differing from each other,
- said cross dichroic prism attached with said image display elements can be freely and detachably attached, so that an emission surface differing from the surfaces, on which said image display elements are attached, opposes to an incident surface of said projection lens, and also a reflection-type polarizing plate and an absorption-type polarizing plate are disposed, sequentially, between the emission surface of said cross dichroic prism and the incident surface of said projection lens, from the emission surface of said cross dichroic prism, opposing to said cross dichroic prisms, and
- the degree of polarization of said reflection-type polarizing plate is larger than that of said absorption-type polarizing plate.
6 more elements
Dependencies are inferred from the claim text.