IPhone 13 pro max got black screened. Won’t work.

I was operating the app called “C’ Anatomy 22”. Suddenly my screen got pixelated and then got black screen.first tried restarting, won’t work. I Tried charging for 20+ minutes and then force restarting, didn’t work. . Then I plugged in to my laptop, didn’t even respond by laptop. Now my IPhone 13 pro max is dead.