It appears to be a broken LCD layer. That comes complete with the LED layer and the digitizer. Replacing the digitizer from the original screen requires removing it from the original screen intact. The labor for that would probably be more than the retail price of the phone. (The digitizer is usually removed in small pieces. The glue has to be heated just enough to lt it come off without tearing the screen underneath, and not enough to melt the screen underneath - which is only a few degrees difference. It's almost impossible to get the whole digitizer to that temperature evenly, even with some experience.)
Having a repair shop replace the screen will probably end up costing a lot less than opening the phone yourself, breaking something, having to fix that, breaking something else, etc., etc. (New techs normally break 5 or 6 screens before replacing a digitizer without breaking anything - on dead phones, of course. Even replacing the whole screen is something they practice a few times before working on a customer's phone.)