I had a few beers when I wrote that
OLEDs see noticeably more wear when they have been in brighter use than the surrounding pixels for long periods.
This results in darkened areas/lines when viewing other material.
Other displays suffer the same but it takes magnitudes of time longer for it to happen so the risk is close to zero during the life of a consumer display. A warranty is provided against burn in.
OLED has no warranty for this, owners must use safe practices to minimise it.
The brighter the image the worse it gets.
My understanding was that OLED can't do HDR? Has that changed?
Newer versions sort of do HDR.
SDR on OLED maxes out around 400nits brightness, they dont push colour OLEDs harder than this.
To get HDR brightness up, another white OLED is used to reach 800nits.
This is unfortunately too low. To get the best from HDR you need at least 1000nits and many movies are mastered much higher.
The lack of boosted colour brightness also dilutes/washes out colour, reducing colour volume.
This is why I opted for the Samsung Q9FN at 2000nits, HDR is glorious!
This year they released a 4000nit display but the price is a bit rich, I can wait.
Unless the life of OLED is improved substantially at much higher brightness, they wont be the best way to watch HDR.
Micro LED is already as capable as OLED but they havent been shrunk enough yet for TVs smaller than around 100" and being new tech arent cheap.
In a few years this should be solved.
It would be great to have the 2 technologies competing head to head but it looks like OLED has an insurmountable limit.
Fingers crossed I am wrong.