John Logie Baird proposed a three dimensional television system that is completely different than the conventional left/right image stereoscopic type. It is a "volumetric" system wherein the camera generates an intensity or "density" signal and a distance or "displacement signal". The volumetric display processes these two signals to generate a three dimensional image without the use of special glasses. See British Patent 373,196, filed 18 February 1931, in the "Patents and Articles" section of the forum.
Although Mr. Baird gives a specific example of a flying spot type camera for generating the two signals, it would be possible to use a standard reflective light camera. In this case, the camera would send out a flying spot IR beam synchronised with the visual scanning system and a couple of flanking IR distance or displacement detection systems instead of visible light ones as shown in Figure 1. This would be sort of a video version of the IR rangefinder systems on ordinary cameras.
The volumetric display could be an LED version of the neon light display shown in Figures 2 and 3. A better solution might be to use a stack of my edge lit transparent scanning discs as described in
http://www.taswegian.com/NBTV/images/TOSE.pdf .