Horizontal lines on display after driver update

Hello everyone!

My notebook: ASUS f751LJ-t6303d

There are multi colored (1purple, 1 green) horizontal "vibrating" lines on the lower part of my display. It also kinda duplicates the upper part, so the lower part is barely visible.

I haven't touched my laptop for over 2 months because of personal reasons. Then I turned it on, everything worked fine, but there was a lot of updating to be done, so I did just that and everything was fine, meaning updating correctly. The next day I was in the middle of a Youtube session (watched like 2-3 vids) when suddenly the display started acting that way. These vibrating horizontal lines appeared out of nowhere.

I plugged in an external monitor and it's working perfectly.... Only the notebook display has a problem, which is why I suspect that it has to do something with the graphic card update or something like that. Problem is that I don't know how to check or fix that.

Could someone please help me?