I believe it works by small electrical currents that transmit electricity through the glass and the glass has some kind of electric lamination that changes in color when the circuit is closed.
Dammit! Someone beat me to it. This would be highly befitting on a luxury car. I can see the looks of passersby as an Audi or Acura with the LCD privacy glass bypasses traffic through Beverly Hills, up PCH in Malibu or even traveling down Sunset in West Hollywood.
Can we sync thousand of film and control in one click on and off and can we control through mobile app and WiFi and can we set secdule and timer and can we control in group
If they can make this cheap enough, remove your house roof. replace with the glass. Night-time you have the choice of privacy OR a transparent dome to watch the stars.