TV's run at 720x480. Anything higher has to be converted and there's a good bit of quality loss. Plus, as I mentioned, TV's work differently than standard CRT/LCD computer monitors, there for there's more quality loss... Yes, overscan will fix the black box problem a bit, but it still normally leavs some. See, TV's actually are made to have about 25% of the screen out of the viewing area. Ever notice how the picture moves when say some game causes the screen to flash? A TV has a "safe zone" Computer monitors, on the other hand, don't have that much of a problem, however, if you didn't correct this, much of the screen would not show...
Eh, ok, I'm finished ^^;;;