Flat panel display rot - "tunnel vision" in electroluminescent and other displays- bad seals.

I have a few GRiD compass systems and some are suffering from massively decreased contrast on the edges of the displays: [See the system on the left] https://www.instagram.com/p/BIGGzUzgat-/?taken-by=tr1nitr0n [Or this one:] http://www.ripstick.com/USCM/images/Grid_Compass_1101_Laptop_in_Box_002.jpg Meanwhile, other EL systems I have- like my HP integral PC- haven't succumbed to this. I have seen similar issues on amLCD displays in my Tadpole, Toshiba and other machines, so this is something we all may have to confront. ------- I was wondering if the folks here had theories? I'm thinking moisture (or air) might be leaking in from the edges of the glass panes, perhaps from a compromised seal- sorry for the silly picture but you can see the composition of the display here: https://www.instagram.com/p/6BXaLBtSzd/?taken-by=tr1nitr0n Does anyone know how one might prevent this from progressing- storage tips? Could it be reversed? Better yet, does anyone have ideas on how to rapidly dehydrate the display? Perhaps there is even a way to re-seal them. I think all two-glass-pane displays that don't have a vacuum may eventually succumb to this. Perhaps it is just oxidation and not moisture, but I'd love to hear any theories.