i believe that it works via differrent frequencies... the screen displays overlapped images and your glasses are polarized and turn on and off at the frequency that your "image" is shown.... it would probably require at least 120hz screen so as not to stutter... but im no genius and am unsure.
thanks fren for posting it, i think that eventhough it is older (as it was speculated) sony does hold a patent on the idea... cant wait to see this in action..
Imagine this on regular TV, watching a sports game and with the push of a button on your 3d glasses you get a different camera angle...