CNN?
LOL - that's exactly my reaction to "CNN" too -- it just happens to be that the logo is REALLY good at testing the burn-in resiliency of OLED monitors

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My son has an LG OLED that's several years old, and no burn in or dimming that's noticeable. Its excellent picture quality annoys me every time I see it, as compared to our circa-2015 70" LCD Vizio that just refuses to die.
Again, no lack of brightness noticed on my son's LG, and the room isn't darkened while he watches sports, which seems like every hour I'm in his home.
Very nice subjective metrics ;-)
OLEDs *look* extra bright because you have superior contrast, so you can easily see the difference between 0% bright pixels and 100% bright pixels. However, the actual brightness is a different story - and measurements show this is a weakness for OLEDs.
If it's a darker room (basement, or generally dark room), OLEDs are bright enough for 99.9% of users. I'm only pointing out that solutions are coming that are "fixing" this weak spot this year and next year - which may or may not be important to the buyer.
If you have nits (brightness) measurements from the TVs - I'd be happy to discuss that

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Do you own an OLED TV which has substantially darkened?
No, for "TV" and my main PC, I use a LG 3840x1600 38" IPS display. It's in a room that has a lot of window glass right behind the monitor, so brightness is important to me. I've looked at a number of OLED replacements (I would like a 5K2K display some day), and none of them match the peak brightness of the IPS display, especially when you have a lot of white on the screen. (The OLEDs tend to hang with 5-10% whiteness, but any higher and the brightness drops off). Also my eyes are getting older and higher brightness is more important than it used to be to me.
LG has also been making updates to subpixel arrangements to improve and resolve "text fringing" which occurs on a number of OLED monitors.
Some info on the tech addressing the subpixel layout and brightness:
https://news.lgdisplay.com/en/2025/...ialization-ofblue-phosphorescent-oled-panels/
(Notice the diagram shows a traditional RGB layout instead of RGBW / RWGB and other layouts that cause the text issues and reduce color accuracy).
(+ Feel free to Google "Text Fringing OLED" for endless examples).