A volume display (English volumetric display) is a graphics display device ( 3D display).
It allows a visual representation of an object in three dimensions. In contrast to conventional two -dimensional displays that can simulate spatial depth only by various visual effects, volume Displays therefore are able to reproduce three -dimensional images that can be viewed from all sides. The pixels were previously used for the description of images in two -dimensional space in such displays are replaced by voxels, which cover a well-defined three -dimensional space. Each voxel can generally take a private, visible state. Typically, this is achieved by the emission of different, depending voxel selectable frequencies in the visible light spectrum.
With a volume display while physical mechanisms are used to represent points of light floating in space, eg via glowing voxels in gas, mist, or on a rapidly rotating ground glass plate or helix. Other solutions use several LCD.
One of the principles of a volumetric display is the screen to move, so that these sweeps an entire volume. When this happens fast enough and depending on the position of the surface other contents are projected summarizes the human eye due to its inertia it all together in an overall closed 3D image.
One approach is the use of a spirally wound surface, shaped like a coil of an Archimedes screw. This surface is mounted and rotates about a vertical axis vertically. A 2-D projector projects a sector of the surface of the image, that is an inclined surface which is higher or lower depending on the actual total angle of rotation. The projector must be in sync with the rotation to that section projecting to the information that match the respective high points on the inclined surface. The Scottish television pioneer J. L. Baird announced in 1941 its volumetric 3D - and color TV system for a patent. Current laboratory systems (Japan, UK) et al use laser light sources.