What about the future ?

Volumetric 3-D Display

http://www.actuality-systems.com/volumetric3d.php3

Heliodisplay

Heliodisplay projects full color streaming video into thin air using a revolutionary technology that produces a 27-inch image and is Plug-and-Play compatible with most video sources (TV, DVD, Computer, Video Consoles). These non-holographic images are fully interactive allowing a hand or finger to select, navigate and manipulate them -- as if they were on a virtual touch screen.

http://www.io2technology.com/specs.htm