Photochromic gyricon display
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United States of America Patent
Stats
-
Apr 15, 2003
Grant Date -
Dec 12, 2002
app pub date -
May 24, 2001
filing date -
May 24, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a display comprising an arrangement of a plurality of optically anisotropic rotatable elements, each of the rotatable elements having a surface in contact with an enabling fluid, the rotatable elements being electrically dipolar in the presence of the enabling fluid and thus being subject to rotation upon application of an electric field, the rotatable elements being free to rotate in place but not free to translate substantially so as to disrupt the arrangement of rotatable elements, wherein a first portion of the surface contains a mixture of a chelating agent and a spiropyran material of the formula ##STR1## wherein n is an integer representing the number of repeat --CH.sub.2 --units and R is --H or --CH.dbd.CH.sub.2, and wherein a second portion of the surface contains substantially no spiropyran.
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