it does exist but you have to sit in the exact right spot for it to work. and its not as good at looking 3D. barely pops out.
there is a new tv about to be premiered, not released, forgot who makes it but it tracks your eyes so that it can adjust the tv to stay 3D even if you move. im not sure how it would cope with multiple people. would be good for a computer monitor though.
i think current 3D tech is dumb and ill wait till actual 3D images. not 2D pretending to be 3D.