Liquid crystal diffractive spatial light modulator and display having two switchable retarders and one passive retarder
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Jun 6, 1997
filing date -
Jun 7, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diffractive spatial light modulator includes first and second substrates between which an optical path is defined including, in order, first, second, and third half wave retarders. The second retarder has a fixed optic axis whereas the first and third retarders have switchable optic axes. The modulator is pixellated and each pixel includes a switchable phase-only diffraction grating. Each pixel is switchable between a first mode in which incident light is output in the zero-th order diffraction lobe and a second mode in which incident light is deflected into higher order diffraction lobes. The spatial light modulator may be used in high brightness projection displays.
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