Free-space display

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A free-space display is a device that projects images into a volume of free space, i.e. into an aerosol mixture such as fog or a gas.

Commonly a set of lasers with rotating mirrors are used (a laser light show). Such displays have limited imaging capability but are 3D.

Alternately a powerful projector may be focused on a narrow wall of suspended aerosol. This is much like a transparent projection screen, and is marketed for interactive displays.

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[edit] Examples

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Display Technology
Non-video Split-flap display | Flip-dot display | Electronic paper
Video Vacuum fluorescent display | Cathode ray tube | Plasma display

(Organic) Light-emitting diode | Laser TV | Liquid crystal display
Digital light processing | Liquid crystal on silicon
Surface-conduction electron-emitter display | Field emission display

Incandescent light bulb
3D Stereoscopic | Volumetric | Laser beam
Static media Movie projector | Slide projector | Hologram | Neon sign
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