Electrowetting retroreflector devices, systems, and methods
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United States of America Patent
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Sep 1, 2015
Grant Date -
Sep 17, 2009
app pub date -
Mar 17, 2009
filing date -
Mar 17, 2008
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Abstract
Switchable retroreflector devices that are modulated via electrowetting. The devices include an electrically-conductive polar fluid and a non-polar fluid that is immiscible with the polar fluid. The polar and the non-polar fluids differ in at least one optical property. The fluids are contained in a fluid vessel, or an array of fluid vessels. The fluids are at least partially viewable. A voltage source is configured to selectively apply an electromechanical force to the polar fluid causing repositioning and/or geometrical change of the fluids such that retroreflection in created, or suppressed, by optical refraction or by optical attenuation.
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