Projection display device
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United States of America Patent
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Sep 2, 2003
Grant Date -
N/A
app pub date -
Feb 9, 1999
filing date -
Feb 16, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention accurately sets a polarization direction of a polarization element, and prevents deterioration of the usage efficiency of the light and a reduction in image contrast. Field lenses are provided on a projection display device. A polarizer is placed on a flat surface of a field lens. The flat surface of the field lens is provided with a reference shape to place the polarizer at the end thereof. The reference shape may be one or more planes provided on the end of the field lens. In addition, the reference shape may be a straight line drawn on the flat surface of the field lens.
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