From what I know it shouldn't damage the screen unless it is a plasma tv , the LCD / LED type would not be effected.
now because the pillars are black they wont burn into that part of the screen but where the image just ends can burn into a plasma on the left and right of the screen leaving a small line on both sides that the 4.3 image would fit into.
not actually seeing one burned I don't know what it looks like but there should be pictures on the internet of such a thing.
again that's based on what I know , if someone else knows more feel free to add away
