Lines on screen after update

Very strange, but it is very unlikely that the lines came because of a software update. It could be a hardware problem. Did you drop your device. No, as far as i know future update is not going to fix lines on the lcd, it is best to get it checked by a certified apple technician.

Wow! Lucky you…

by the way do a force restart once:

Force restart an iPhone with Face ID

Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the side button. When the Apple logo appears, release the button.