I'm sure these will be popping up at stores soon. An article in CIO Magazine details Hitachi's new AirSho system that "projects dynamic pictures onto nearly invisible glass surfaces, such as a storefront windows." (Image from Hitachi)
The system displays full-motion images -- generated by a PC or DVD player -- that give the illusion of appearing out of nowhere. It uses a floor- or ceiling-mounted projector that shines video onto a photopolymer-resinous Plexiglas display. The 40- or 60-inch diagonal screen sticks to the window's surface with water -- like a decal. "It's similar to a screen, but you can actually see right through it while an image is appearing," says Ray Soltys, a spokesman for Hitachi America's Digital Media Division.
The system is a slick combination of cutting-edge materials and optical engineering. The screen consists of a 60-nanometer film of photopolymer resin glued to a piece of Plexiglas. The film itself is laser etched to create tiny prisms. Each prism must be angled precisely, and the Plexiglas must contain no air bubbles so that the projected light can follow a path directly into the viewers' eyes.
With touch control (not yet available), and connections to our computers we'll be doing the "Minority Report" thing, as Roland Piquepaille makes reference to.
Source: CIO Magazine
Found at: Roland Piquepaille's Technology Trends, "Magic Window"