There is the problem of "OLED smearing"[0] with pure black that makes using it somewhat unviable. It seems that some OLEDs are more susceptible than others, though. Also fairly certain that this only happens with #000.
All LCD technologies have pixel transition times that vary based on the old and new colors and are often larger than the refresh rate, this is nothing new with OLED. Typically these do get improved over time. I've compared the video on my OLED phone and non-OLED monitor and the smearing is not significantly different.
account42|4 years ago
wizzwizz4|4 years ago
frosted-flakes|4 years ago
officeplant|4 years ago