The displays which project images that appear to be 3-dimensional are called 3D displays. Early models were not truly 3D and required stereoscopic goggles. However, scientists believe that full-fledged 3D displays will be available by 2015. One primary limitation is that holograms are designed in such a way that they can be viewed from one angle only. But research is going on to make 3D displays that focus on head-tracking optics and are designed in such a way that they follow the viewer's gaze from around the room. Holographic projections are also researched upon which can be viewed from more than one angle. Although this technology have been around for decades but it will take time before it hit the shelves.
A display called M2i has been created by a company names IO2 technology and this display can project 3D images in the air. But the cost of each unit is around $20,000 US Dollars. A rear projection system is used by the display in order to create the images in air and they call it 'transformed air'. But there is some ethereal look to these images but this technology works in all types of lightning conditions. This M2i display can pave a way for more superior 3D technology.
However, the National Institute of Advanced Industrial Science and Technology in Japan have created a more sophisticated 3D display. They call it the first 'true 3D display'. Overlapping of laser beams is employed by this technology in order to create tiny plasma flashpoints in the air. And the human eye picks the afterglow. As many as 100 airborne dots are generated by the system. It also generates plasma 'pops' at a rate of 100 times per second. But the display creates constant crackling noise because tiny portions of air are superheated by the laser in order to produce plasma. And the display can produce only white dots which also act as a barrier for commercial deployment. But still it is considered an interesting approach.
Production of high quality content to be ported to displays is one of the difficult things in creation of 3D displays. Multiple camera viewings are required in order to film a 3D image. To convert a 2D image into 3D spatial map, special software is required. Due to these reasons it may take a while before 3D displays become completely feasible. Another reason is the slow adoption of high-definition televisions which causes the companies to consider choosing where to place their research dollars. But no matter how much time it will take, 3D technology is the future.
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