An interior rearview mirror system for a vehicle includes a mirror assembly having a variable reflectance element. The variable reflectance element includes a metallic mirror reflector on one side of a substrate, with the metallic mirror reflector being partially transmissive to visible light. The interior...http://www.google.com.tw/patents/US7926960?utm_source=gb-gplus-share專利 US7926960 - Interior rearview mirror system for vehicle
