Automatic dimming mirror using semiconductor glare sensor
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United States of America Patent
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-
Mar 8, 2005
Issued Date -
N/A
app pub date -
May 28, 2004
filing date -
Jan 25, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An automatically dimming mirror includes a dimming element having variable reflectivity, the degree of reflectivity based on a control signal. An ambient light sensor is positioned to receive light from a region generally in front of the vehicle. The ambient light sensor outputs a discrete ambient light signal based on the amount of light incident on the ambient light sensor over an integration period. A glare sensor is positioned to view the scene generally behind the vehicle operator. The glare sensor outputs a discrete glare signal based on the amount of light incident on the glare sensor over an integration period. A dimming logic determines an ambient light level based on the ambient light signal. The glare integration period is determined based on the ambient light level. The glare signal resulting from the glare integration period determines a mirror glare level used to set the dimming element control signal.
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Cited Art Landscape
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