Illumination device and application thereof to the illumination of a transmissive screen
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Jul 16, 1997
filing date -
Jul 16, 1996
priority date (Note) -
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Abstract
An illumination device comprises a light source coupled to a waveguide. the waveguide comprises a diffracting element capable of diffracting emergent light rays coming from the source, in a direction substantially perpendicular to the surface of the waveguide. A device of this kind is particularly well-suited to transmissive display screens of the liquid crystal display screen type. It can generate a highly collimated, polarized light.
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