** Ten-month burn-in testing reveals all OLED monitors and TVs suffer some amount of burn-in, but LCD monitors also have uniformity issues **
RTINGS' ongoing OLED display testing reveals favorable results for monitors, the seemingly inevitable burn-in of OLED TVs, and breaks down how different manufacturers are dealing with this issue. Plus, it turns out LCDs have their own severe uniformity issues.
https://www.tomshardware.com/news/oled-burn-in-testing-10-months