I would like to know if the touchscreen is damaged or the lcd display or something else?
That could be caused by two things.
1. Water damage
2. Over heating of device(maybe the battery)
A friend of mines android phone got too hot that he had the same result. His was worse than this. when you look at his device carefully, you could see the shape of the battery underneath the screen.
It might be you left the device in a hot place or under you pillow or something like that, without any air flow with 3g or wifi connected.
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