Polarizing, photochromic devices and methods of making the same
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United States of America Patent
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Mar 25, 2008
Grant Date -
Mar 8, 2007
app pub date -
Oct 31, 2006
filing date -
Jul 1, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
An optical element including: a substrate; and an at least partial coating having a first state and a second state on at least a portion of the substrate, the at least partial coating being adapted to be circularly polarizing or elliptically polarizing in at least one state and containing: a chiral nematic or cholesteric liquid crystal material having molecules that are helically arranged through a thickness of the at least partial coating; and at least one photochromic-dichroic compound that is at least partially aligned with the liquid crystal material such that a long axis of a molecule of the photochromic-dichroic compound is generally parallel to the molecules of the liquid crystal material.
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