Color display device with chirped diffraction gratings
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United States of America Patent
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Mar 25, 1997
Grant Date -
N/A
app pub date -
Aug 10, 1993
filing date -
Aug 11, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A display device comprises a liquid crystal spatial light modulator (1) associated with diffractive means, such as a diffraction grating comprising grating elements (5). The diffraction grating is illuminated by a light source (6, 7) and each element is chirped and blazed so as to separate the primary colors of the illuminating light and direct them to individual light-modulating elements (R, G, B) of the modulator (1). By dispensing with conventional color filters, the efficiency of the display device is improved. Further, the focusing action of the grating elements (5) directs light to the elements of the modulator (1) so as to prevent light wastage caused by blocking of light by opaque regions of the display.
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