Diffractive combiner for multicolor and monochrome display, method of manufacture and head-up display device using same
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United States of America Patent
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Jul 2, 2013
Grant Date -
Oct 27, 2011
app pub date -
Dec 9, 2009
filing date -
Dec 9, 2008
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Abstract
A method for producing a single-layer diffractive combiner for a head-up display having a projection unit with n light sources of λi wavelength(s), where i=1 to n sending light towards the combiner at an angle θp. The method includes forming interference fringes for each λi wavelength on a photosensitive layer with an interference of two light beams from a single laser source of wavelength λe, where the forming step is repeated n times, and each time the forming step is repeated an angle θi between the two beams is determined according to θi=arcsin ((λe/λi)*sin(θp)), one of the interfering beams being divergent and having a spherical wave front and the other being a plane wave, the interference of the beams generating a diffractive network with an adjustable pitch and curved contour fringe lines.
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