You need to distinguish between burn-in and image retention. Are you seeing burn-in or just image retention?
Burn-in: When you have an image that stays even long after you've switched (e.g., the news channel logo is permanently stuck in the corner).
Image retention: When a static image is briefly retained when you switch the image to a mostly-even color (e.g., a logo stays after you switch to a mostly-gray background, but fades over a period of minutes/hours).
I've seen image retention on my 55EG9100 (even older than another post's 'burned in' C6), but I've never seen burn-in. And I played lots and lots of video games that has static HUDs.
Ostensibly the newer OLED panels have even less image retention problems than the older ones. I've never noticed even image retention on my newer C8 OLED.
Wasn't the problem with OLEDs simply breakdown? They lose some percentage of their brightness and color depth every year until they look old and washed out? And the worst part is each color degrades at a different rate so the color balance gets wonky as the panel ages.
OLED aging is one of the primary reasons that burn-in is a thing. There's a ton of algorithms to try to normalize this so as the panel ages that it just uniformly dims, and you don't get hot spots (or cold spots). I don't think it's complex enough to handle stuff like the news logos though. Generally speaking it's assumed that the pixels are all exercised somewhat uniformly I think.
Burn-in: When you have an image that stays even long after you've switched (e.g., the news channel logo is permanently stuck in the corner).
Image retention: When a static image is briefly retained when you switch the image to a mostly-even color (e.g., a logo stays after you switch to a mostly-gray background, but fades over a period of minutes/hours).
I've seen image retention on my 55EG9100 (even older than another post's 'burned in' C6), but I've never seen burn-in. And I played lots and lots of video games that has static HUDs.
Ostensibly the newer OLED panels have even less image retention problems than the older ones. I've never noticed even image retention on my newer C8 OLED.