Projection type display apparatus having a light source and display element configured to provide increased lifespan of optical constituent components
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United States of America Patent
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Jun 30, 2015
Grant Date -
Jun 5, 2014
app pub date -
Feb 10, 2014
filing date -
Jan 29, 2010
priority date (Note) -
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Abstract
A projection type display apparatus including a light source, a display element, an illumination optical system and a projection lens to project a magnified image of the optical image. The illumination optical system includes a first array lens and a second array lens, each includes a plurality of lens elements arranged in a matrix, each of the lens elements having a rectangular opening, and a polarization conversion element having polarization conversion function by use of a plurality of polarized beam splitters and a plurality of half-wave phase plates, arranged in an array and opposing to the lens elements of the second array lens, to emit predetermined polarized light. The light source includes a light emitting plane of a rectangle or an ellipse shape, a longitudinal direction of the light emitting plane being parallel to a longitudinal direction of each opening of the polarization conversion element.
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