Patent ID: 7843404

Claim:
A smart mirror apparatus to prevent light transmitted from behind a vehicle from dazzling a driver of the vehicle, comprising: a reflective mirror provided in the vehicle; an LCD panel placed in a light path between the reflective mirror and eyes of the driver, and comprising one or two polarizing sheets, each having a polarization rate ranging from 50% to 95% in a visible light band, the LCD panel varying a light transmissivity thereof depending on a magnitude of voltage applied to the LCD panel, thus adjusting a quantity of light that reaches the driver after being reflected by the reflective mirror; an incident light detecting unit detecting both brightness of the incident light transmitted from behind the vehicle to the LCD panel and brightness around the LCD panel, and calculating a difference value therebetween; a voltage determination unit receiving the difference value calculated by the incident light detecting unit and determining the drive voltage depending on the difference value; and a voltage apply and supply unit to apply the drive voltage determined by the voltage determination unit to the LCD panel.