Virtual Touch Screen
Encyclopedia
A virtual
Virtual
The term virtual is a concept applied in many fields with somewhat differing connotations, and also, differing denotations.The term has been defined in philosophy as "that which is not real" but may display the salient qualities of the real....

touch screen is a user interface system that displays images in thin air. The screen uses a rear projector
Image projector
An image projector is an optical device that projects an image onto a surface, commonly a projection screen.Most projectors creates an image by shining a light through a small transparent image, but some newer types of projectors can project the image directly, by using lasers...

 system to create images that look three dimensional and appear to float in midair. The images are interacted with your hands and no specialized equipment is needed.
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