Mmm… it would be smart making sure the issue is the display (most likely) if you have an external display which you can connect to your system as well as a keyboard and mouse so you can test the system in Clamshell mode as you need the screens lid down for the external to become the Primary.
If that’s not possible, you could try accessing your system from a second machine system via Target Disk Mode, that wont test the graphics but should at least validate the rest of the system is OK.
As to your issue this does look like a damaged screen often caused by a good bang, something heavy sitting on the lid. Make sure you don’t have anything sitting between the keyboard and lid a paperclip or a camera cover as that can ALSO stress the display causing the LCD panel to encounter micro fractures which sever the metal oxide traces that move the signals across the LCD panel. And lastly a liquid spill in just the wrong place.
Here’s the guide to replace it [guide|142554] and her’s the needed part [product|IF188-159]