Optical device having a wide field-of-view for multicolor images
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United States of America Patent
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Jun 29, 2004
Grant Date -
Oct 30, 2003
app pub date -
Apr 25, 2002
filing date -
Apr 25, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, .lambda..sub.B, and shorter than a longest wavelength, .lambda..sub.R, the light striking the diffractive optical element at an angle greater than a first field-of-view angle, .alpha..sup.-.sub.FOV, and smaller than a second field-of-view angle, .alpha..sup.+.sub.FOV. The diffractive optical element comprising a linear grating being formed in a light-transmissive substrate. The linear grating is characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of .lambda..sub.B and a striking angle of .alpha..sup.-.sub.FOV. The light-transmissive substrate is characterized by an index of refraction, n.sub.s, larger than a minimal index of refraction, n.sub.MIN, which is selected so as to allow total internal reflection of a light having wavelength of .lambda..sub.R and a striking angle of .alpha..sup.+.sub.FOV.
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