The only glasses-free 3D tech I know of works by restricting the viewing angle of each of the two sets of pixels to such a small area that each eye gets a diffe

The only glasses-free 3D tech I know of works by restricting the viewing angle of each of the two sets of pixels to such a small area that each eye gets a different set. That would make the viable "invisible" view positions even more constrained than with the technique shown in the video.