I just realized im not really sure how this works. If I take a DVD that is 720x480p and watch it on a 1280x720p screen, whats really happening? Am I watching 720x480 pixels or am I watching 1280x720 pixels that were stretched or created/duplicated by a 720x480 source? Would watching 720x480 on a 720x480 display loko better then watching on it on a 1280x720 display? LCDs and DLPs and Plasmas have a fixed pixel number right, so what determines the pixel limit a Tube TV or rear projection TV with the same technology. What makes one a Tube TV without a high definition tuner not capable of HD while another Tube TV without a tuner is capable of HD if you get one?