first my understanding: this technology (if you wish to call it that), is that the TV will display 2 different images, 1 for each eye. You will have to ware some glasses that can *block* one eye while allowing the other eye to receive the image that is meant for it. This will work because the TV will have a transmitter that will tell the nearby glasses, to which eye the current image is being displayed for. So if the image currently on display is for the left eye, the TV will tell the glasses to block the right eye, then the reveries for the next image, this happens about 120 time per second (120Hz).
now, the reason we need to get the *NEW* 3D TVs, is because they have this *transmitter* built in (or as an optional add-on), but the *OLD* (current) TVs do NOT have this *transmitter* and there is no way of adding it to the TV as an add-on. But both the new and the current TVs are able to refresh the image 120 time per second (120Hz and even 240Hz). Which mean that the current TVs are *able* to display the 3D image, the problem is with the *glasses*, who will tell the glasses which eye should see the current image?
now for my question (if the above is true), why can't the game console (PS3, Xbox360) or even the PC, be the ones to handle the transmitting of the signal to the glasses? Ultimately, the image being displayed on the TV is under the control of the console or the PC (the TV only need to worry about displaying the image it receives). So why can't we have a USB add-on to the console or TV that will handle the glasses part, while allowing us to keep the current TV / screens?
P.S. the fact that they won't make enough money on a USB add-on is not the answer I am looking for.