Projection screen and projection system comprising the same
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United States of America Patent
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Jun 6, 2006
Grant Date -
Mar 17, 2005
app pub date -
Jul 21, 2004
filing date -
Jul 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a projection screen capable of sharply displaying an image even under bright environmental light, of improving brightness distribution and viewing angle, and of providing high image visibility, and a projection system including such a projection screen. The projection screen includes: a polarized-light selective reflection layer that selectively reflects a specific polarized-light component; a substrate that supports the polarized-light selective reflection layer and a circular Fresnel lens provided on the observation side of the polarized-light selective reflection layer. The circular Fresnel lens controls the optical axis of right-handed circularly polarized light projected on the projection screen so that the light enters the polarized-light selective reflection layer nearly vertically to it regardless of the point and angle at which the light is incident on this layer.
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