MacBook screen a glitchy grey, computer works fine

The display on my laptop is suddenly not working. Computer itself is fine, I’ve hooked it up to an external display for now. Check out the picture I’ve included to see how weird it looks: there’s a vignette around the edges of the screen, then in the center of the screen it’s gray with a bunch of horizontal bars and inbetween the vignette and the center part it’s a light grey colour. it started off as just plain grey and quickly progressed to what you see now.

I’d like to figure out what components i probably have to reconnect or replace (is it probably just something i have to reglue or do i need to replace the entire display, for instance?) I haven’t dropped my Mac however I do carry with me in a bag, so maybe it got bumped?

thanks so much in advance! :)

in case the image doesn’t attach here’s a link to it: https://www.dropbox.com/s/bed4n20dksmfir...