I have had my ipad mini for 2 days. I have noticed that there are permanent lines "burnt" into the screen. In landscape mode the lines are vertical; in portrait, the lines are horizontal. It is really noticeable when viewing dark images or films. It also shows up when viewing web sites on safari.
I don't remember seeing this at first but I've only just got around to putting any pics or films onto the mini. I would post an image but if I do a screen grab, the lines aren't there.
