Stepped surface diffuser
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United States of America Patent
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-
Apr 20, 2004
Grant Date -
N/A
app pub date -
Oct 14, 2001
filing date -
Dec 31, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical device such as an overlay panel for a LCD display, comprises an element of light-transmitting material having a surface configured to form a stepped Fresnel prismatic structure. The light-transmitting material itself or ribbed light refracting element, said element incorporates an array of graded refractive index features adapted to impart light dispersing of diffusing characteristics to the light-transmitting material. In an alternative arrangement, the element of light-transmitting material has a layer configured to form a stepped Fresnel-type surface and an additional layer incorporating such an array of graded refractive index features.
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