Optical projection apparatus, transmission type screen, and projection type image display apparatus
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United States of America Patent
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Jun 3, 2003
Grant Date -
N/A
app pub date -
Jan 18, 2000
filing date -
Jan 21, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A single-panel liquid crystal rear side projection type image display apparatus, which is compact in size and can satisfy requirements of both brightness and color purity and can focus images very sharply with the contrast property improved significantly and with less screen distortion, and a projection lens unit comprising three lens groups of about F1.5, which is composed so as to cool the video generator with a cooling liquid and is provided with first to third dichroic mirrors DM1, DM2, and DM3 for separating a white light into the three primary colors in order of red, blue, and green.
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