Requirements to the volumetric displays and their features in comparison with 2-D screen based 3-D displays are considered. The main difference of a volumetric display is a possibility to look around displayed 3-D object by many observers from other sides simultaneously, and no points of view are calculated for this. Optical, optical-mechanical and optical-electrical methods of addressing the voxels in a volumetric media are discussed. Basic features, advantages and disadvantages of concrete volumetric display developments on the base of the two-photon absorption, rotating helix or disc, light scattering in liquid crystal shutters are presented. Problems and prospects of volumetric displays are discussed.
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