So the screen assembly for the current paperwhite looks to be glued together and probably isn't coming apart without a fight (there are a few disassembly videos on youtube) - there's a screen assembly on Aliexpress if you want to roll the dice and take your chances with that
https://www.aliexpress.com/i/4000327299567.html
However - looking at the system, there are three cables that go from the screen assembly to the main board - they all appear to be the standard snap-in-place connectors (and are sealed with an adhesive of some sort) but perhaps one of them came loose? you could pull the back off and push down on them to see if one or more of them has come partially unseated... otherwise, it's looking like new kindle time, unfortunately.