guys i really need help how can i fix this problem its just suddenly appear to my iphone screen and i dont know why please help see here: https://ibb.co/h4UK9c
It looks like your iPhone has several vertical lines down the display. I know this can be concerning, so I'd like to take a few steps and see if can isolate this. Has there been any accidental damage to the iPhone? The answer to that will help isolate if the cause could be hardware or software related.
If after reinstalling the iOS, you're still seeing the issue with the vertical lines then the next step will be to look into hardware service: iPhone Repair