Projection-type image display apparatus
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United States of America Patent
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Feb 17, 2015
Grant Date -
Mar 14, 2013
app pub date -
Sep 7, 2012
filing date -
Sep 13, 2011
priority date (Note) -
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Abstract
A projection-type image display apparatus includes a color separation element including a color separation surface, a light modulation element configured to receive the light divided by the color separation element, a polarizing beam splitter disposed between the color separation element and a projection optical system to separate a light path of a light modulated by the light modulation element according to a polarization direction and guide the resulting light to the projection optical system, and a phase difference plate disposed between the color separation element and the light modulation element. An optic axis of the phase difference plate and the normal of the color separation surface are substantially parallel or perpendicular to each other, in a cross section parallel to a normal of the color separation surface and a normal of the light modulation element.
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