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why is the display on Iphone 5S becoming degraded after heat exposure?

My phone was outside, partly in sun, on 97 degree day recently and the "too hot for use" warning came on. Phone was taken inside and allowed to cool off to room temp over a couple of hours. Now the display will vary from normal to fading to stripes of green and purple, but the message/app or whatever is open will still be somewhat visible. I do not know how long it was exposed to the sun/heat, but probably more than an hour before i noticed it.