Head-up display with narrow band reflective polarizer
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United States of America Patent
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Oct 17, 2006
Issued Date -
N/A
app pub date -
Jul 29, 2005
filing date -
Dec 31, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A head-up display includes a projection system and a window having a target area where a reflective polarizer is positioned to reflect light from the projection system to a viewing area. Light from the projection system is p-polarized and strikes exposed window surface(s) at an acute angle to reduce or eliminate multiple or 'ghost' images. The acute angle is closely matched to a Brewster angle of the exposed window surface(s). The reflective polarizer includes a multilayer stack with refractive indices of individual layers chosen to reflect p-polarized light substantially more than s-polarized light over a wide angular range that includes the acute angle. The reflective polarizer also can reflect infrared light to reduce cabin heating from solar radiation.
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Cited Art Landscape
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