Helio display is a Hi-tech projector or display system that displays picture in air already present in the room.The system was developed by io2 technology in 2001 which is focused onto a layer of mist in mid-air,resulting in a two-dimensional display that seems to float but appears three-dimensional when using appropriate content but the image is not volumetric.Dark areas of image produced by heliodisplay appears invisible does making it look more realistic.