Thanks for stopping by the Apple Support Communities. From your post, I see you have been experiencing some trouble with your display since updating your iPhone SE to iOS 11.1.1. I'm happy to help!
Based on what you've described, I would recommend using Get help with the display on your iPhone, iPad, or iPod touch - Apple Support . Locate the relevant issue(s) in the article, and follow the steps provided.
If you are unable to resolve your issue using that article, the next step would be to reach out to Apple Support for additional assistance. You can do that here: Contact Apple Support .