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Why OLED monitor burn-in isn’t a huge problem anymore
(arstechnica.com)
This is a most excellent place for technology news and articles.
Could try to adapt your gaming sessions to include short breaks to help prevent injury, and grab a snack maybe. 10 minute breaks every hour (or few hours :) ) where you turn the monitor off may help?
That’s just far more thought than anybody should be putting into monitor usage.