They used existing tech from other companies well and leveraged the obvious advantage of a handheld over a TV in the process.
Right now this tech doesn't work that well on TVs in terms of replicating a wide viewing angle allowing lot's of people to be sitting around a room a different angles and distances.
But on a handheld the view is one viewer at a fairly known distance. Hence it's a marriage of device and tech that works pretty well in this case.
Try to be reasonable... its easier than you think...