Electrochromic device and method
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United States of America Patent
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Oct 10, 2000
Grant Date -
N/A
app pub date -
Jun 1, 1998
filing date -
Jun 6, 1997
priority date (Note) -
Expired
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Abstract
Electrochromic device and method. In one disclosed embodiment, an electrochromic coating is applied to a light transmissive substrate, and a first control voltage is generated in accordance with the amount of light impinging upon the substrate. That control voltage is applied to the electrochromic coating to decrease the transmittance of the substrate as the light increases. Ambient light conditions are monitored to provide a second control voltage which is applied to the electrochromic coating to decrease the transmittance of the substrate when the ambient light falls below a predetermined level, e.g. at night. In other disclosed embodiments, the electrochromic coating is applied to the lenses of a pair of glasses and to a lamp shade, with photovoltaic cells for controlling the transmittance of the coating in accordance with the amount of impinging light.
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