Beam shaping method and apparatus
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United States of America Patent
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N/A
Issued Date -
Jun 12, 2008
app pub date -
Nov 30, 2007
filing date -
Nov 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical device includes a source such as an LED, a microdisplay such as an LCoS panel, and one or more cylindrical lens surfaces that (in combination if more than one) changes the aspect ratio of light emanating from the source to the aspect ratio of the microdisplay without clipping. The cylindrical optical surface defines parallel cross sections, each of which define a center of curvature such that the centers of curvatures together define a line that crosses an optical axis between the microdisplay and the source, or an extension or that axis. Changing the aspect ratio in this manner preserves total luminance since clipping is not used to change the aspect ratio, and provides a substantially uniform illumination across the new aspect ratio. Also detailed is a method and further details of an exemplary pocket sized optical engine for which the output of the microdisplay is directed to a projection lens.
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