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As the manufacturer describes it "Heliodisplay images are not holographic although they are free-space, employing a rear projection system in which images are captured onto a nearly invisible plane of transformed air."
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Inition presents Heliodisplay is a breakthrough in visual communication technology, developed and brought to market with IO2 Technology. The Heliodisplay allows images and video to be projected into mid-air.
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Apparently the latest models use "an improved tri-flow system for increased image stability and uniformity..." Other improvements include: enhanced brightness and clarity, a 1,024 x 768 resolution, 16:9 or 4:3 aspect ratios, 2000:1 contrast ratio, USB, NTSC/PAL compatibile, VGA/S-Video inputs, and is "significantly quieter."
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The Heliodisplay plugs into your computer's VGA and USB ports, and the computer sees your finger on the image in the air as a mouse. This video is of an older Heliodisplay (M2i). The new ones look better. From http://www.heliodisp lay.com