I'm also facing the same issue after updating. I was using my phone and suddenly the phone started glitching and turned out complete green. I tried methods of restart etc but none of this worked. My phone is Japanese variant and 40 days out of warranty only. In apple service centre they are telling us that it's not the problem of Display but the Hardware as Rear system of the phone. It's so frustrating that even after paying so much of money, Apple are doing this to us. Most of the people are facing same kind of issue and apple is not doing anything to fix it. Pathetic service