I remember reading about a technology that used the 3D functionality of TVs, along with 3D glasses, to display two separate video feeds to two separate users -

I remember reading about a technology that used the 3D functionality of TVs, along with 3D glasses, to display two separate video feeds to two separate users - split screen, but without splitting the screen. Instead of the video feed alternating between left and right images, it alternates between first player and second player feeds. The glasses, instead of alternating between left-open/right-closed and vice-versa, alternates between both-open/both-closed. I'm not sure how audio would be handled in this case, and I don't know if anyone actually really supported it in practice, but it was a pretty neat idea.