Method for controlling brightness and increasing uniformity of light generated by lambertian surface sources
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United States of America Patent
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Apr 19, 2011
Grant Date -
Sep 9, 2010
app pub date -
Mar 9, 2009
filing date -
Mar 9, 2009
priority date (Note) -
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Abstract
A method for controlling the brightness and increasing uniformity of light generated by Lambertian surface sources has the steps of providing multiple pairs of Lambertian surface sources to produce light emitting on a target surface, each pair of Lambertian surface sources consisting of two Lambertian surface sources; rotating the two Lambertian surface sources of the same pair by a same rotation angle relative to the target surface but in opposite directions; calculating a maximum illumination and a minimum illumination corresponding to the rotation angle; determining whether a ratio of the maximum illumination to the minimum illumination is lower than a threshold; and fixing the Lambertian surface sources at the rotation angle if the ratio is lower than the threshold.
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