Front surface mirror for providing white color uniformity for polarized systems with a large range of incidence angles
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United States of America Patent
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Jan 5, 2010
Grant Date -
May 31, 2007
app pub date -
May 10, 2006
filing date -
Nov 28, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A fold mirror for a projection display system is designed to lessen a perceived variation in white color balance of light reflected across the mirror wherein the white light is comprised of sub-beams of orthogonal polarization states. The mirror comprises a metal reflective layer and a plurality of optically transparent layers, wherein thicknesses and materials of the optically transparent layers are such that wavelength-averaged reflectance for p-polarized incident green light varies by less than 1%, wavelength-averaged reflectance for s-polarized blue light varies by less than 1.5%, and wavelength-averaged reflectance for s-polarized red light varies by about 4% over a range of angles of incidence between 0 and 65 degrees.
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