Screen getting vertical and horizontal lines over time

Hey y'all! So the problem is with my 5S is the screen. If i unlock the phone, then leave the screen on for too long (depends on brightness) the screen gets glitchy, and the multitouch glitches out, then stops completely.

This is the how it look when its almost completely glitched

if i leave the screen on the dimmest brightness setting, it takes about 10 mins to get some lines (still working, just a bit odd looking), but on max brightness, it takes about 3 seconds for the screen to glitch out completely.

The screen itself is not damaged, i may have dropped it, but not the day before the problem occured.

Anyone can help what can cause the problem?

Thanks in advance!