Phone home screens appear blurry due to the default blur effect in iOS, and some other reasons. Fix it by customizing ...

In case you've changed a wallpaper, only to notice that the top-half of your iPhone's lock screen has gotten blurry, you're not alone — and there's nothing wrong with your iPhone's screen.

How to create a custom lock screen To start personalizing, you’ll first need to create a new lock screen or modify an existing one.