Automatic Day/Night Mirror: Operation

A thin layer of electrochromatic material between two pieces of conductive glass make up the face of the mirror. The system will automatically change the reflectance of the inside rear view mirror to protect the driver from the unwanted headlight glare of trailing vehicles while driving at night. The self-dimming feature is defeated if the interior lights are switched on, or the system senses the backup light circuit is energized whenever the transmission is shifted into reverse.