This is my old cabled/wired VP2 console. It has been sitting on a shelf, unplugged and unpowered, for almost five years exactly. It was horizontal, as in flat, with the screen side up and was stored indoors.
Decided that I'd like to use it for a project today and pulled it out to find this screen damage. Frankly, I'm not sure how to refer to it other than ants in the screen. Maybe a liquid crystal "leak"?
Anyway, has anyone seen this before? If so, is there a fix? (I think I know the answer...) It's obviously under the glass, which appears bonded to the LCD and is not removable. The screen otherwise powers up and looks fine apart from the blotch.


Close up with light reflecting so it looks white:

Screen on, and sorry for the five years of dust. This was before cleaning it.

Thanks!