Display device and a method for illuminating a light modulator array of a display device
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United States of America Patent
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Dec 11, 2012
Grant Date -
Jan 27, 2011
app pub date -
Feb 13, 2008
filing date -
Feb 13, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Illuminating light (B2, B3) for a liquid crystal on silicon (LCOS) micro-display (210) is provided by an illuminating unit (100). The illuminating unit (100) has a waveguiding substrate (7) and a plurality of light out-coupling features (F30). The substrate (7) has two substantially parallel surfaces (41,42). Light coupled into said substrate (7) is reflected several times on the surfaces (41,42) of the substrate (7) by total internal reflection (TIR) before being coupled out of the substrate (7). Thus a portion (102) of said substrate (7) may act as an optical integrator for smoothing out variations in spatial intensity distribution of light propagating within said substrate (7). The out-coupling efficiencies of the out-coupling features (F30) may be selected to minimize vignetting and/or to minimize stray light effects.
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