Toshiba Shows 55-Inch Naked-Eye 3D TV With 3,8402,160 Resolution | TechCrunch
I think they are creating an illusion of depth using those extra pixels.
Toshiba has unveiled the worlds first 4k2k 3D TV that requires no glasses to view 3D and provides a massive 4 x Full HD resolution of 3,840 2,160 pixels. But unfortunately if you are viewing 3D movies or media the resolution can only reach 1280 x 720.
I think they are creating an illusion of depth using those extra pixels.