Something is wrong with my Iphone 5

As soon as I unlock the screen it slowly gets lines through it where apps and text are. As soon as it darkens enough i cannot use the touch screen and i have to hit the top button and unlock it again. I don't know what to do because i have a year left for this phone. SOmeone said water damage but that coulnt be the case since i havent got it wet. someone help! i can barely use my phone.

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