The Helio Display projects video in thin air using a modified projector. It can use any device like Laptop, Camcorder, TV as the media source the images are not holographic but free-space. What the viewer sees is floating mid-air image or video. These projected images and video are two-dimensional, (i.e. planar) but appear 3D since there is no physical depth reference. The Heliodisplay projects 30" diagonal images in 4:3 and 16:9 aspect ratio. Brightness is still an issue and a dark background is recommended. On the drawing board is adding interactivity so you can control the images by moving your hand through them.
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Helio Display is developed by IO2 Technologies in San Francisco and the display costs a cool $ 20,000.