POWER SUPPLY OF AN ELECTRICALLY CONTROLLABLE LIQUID CRYSTAL GLAZING, AND METHOD FOR POWERING SUCH A GLAZING
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United States of America Patent
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Feb 19, 2015
app pub date -
Mar 29, 2013
filing date -
Mar 30, 2012
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Abstract
An electrically-controlled liquid crystal glazing unit can include a substrate carrying a liquid crystal element disposed between a first electrode and a second electrode connected to an electrical power supply. The liquid crystal element can transform from a diffusing state at zero voltage to a transparent and/or colored state at a sinusoidal AC voltage having an operating amplitude (V0). In some examples, the electrical power supply is configured to apply a start-up voltage whose amplitude progressively increases from zero up to the operating amplitude (V0) and/or a shut-down voltage (Vs(t)) whose amplitude decreases progressively from the operating amplitude (V0) down to zero.
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