Optical film
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United States of America Patent
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-
Sep 12, 2000
Issued Date -
N/A
app pub date -
Sep 2, 1998
filing date -
Dec 21, 1993
priority date (Note) -
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Abstract
An optical film comprising a plurality of layers wherein the refractive index difference between the layers along at least one in-plane axis is greater than the refractive index difference between the layers along an out-of-plane axis. The film has an average reflectivity of at least 60% for a predetermined bandwidth of light incident at 60.degree. from normal to the plane of the film, said light being polarized in a plane defined by the at least one in-plane axis and the out-of-plane axis.
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