Are you sure this is the case? The monotone OLED displays on my University's 3D printers show signs of burn-in (however, it should be noted that these are running 24/7). They are bigger display and maybe the smaller ones are less prone to burn-in, but i can't seem to find any info regarding this.
EDIT: Found an image illustrating signs of burn-in on an Ultimaker:
Ahh I see, you are correct, I didn’t know the display actually revered contrast of background, that would reveal the burn in. Sorry I was under the impression there were simply areas of the screen the text was fixed, and wouldn’t do this sort of inverse. Though, interestingly I think this is another SKU. But you’re right, burn in is inevitable in that case.
One thing about OLED people seem to misconstrue is that, it’s not actual burn in as we understand it from the CRT/Plasma days. This is simply the issue of the organic material being depleted per pixel. This is why you don’t see any serious attempts at making OLED monitors (far too manny static elements in the PC sphere). The trick is to have all pixels evenly deplete their diode matter. With these sorts of displays where no anti-retention techniques exists (like pixel shifting and such) burn in is inevitable regardless if you turn the screen on and off in attempt to mitigate the issue. All you’re doing is whatwhat delaying the ordeal.
Screen savers have sadly fallen out of favor in the last two decades. I have a feeling, if OLED is to ever become a thing again, they will make a reappearance.
Sorry for my misinformation prior, I never actually seen a 1-bit matrix fall off a cliff in terms of brightness specs this quick for these devices. They must be old formulas or whatnot seeing as how they’re small enough displays for anyone to feel they would require much updating. I’ve seen color gamut fade fast, but brightness I wouldn’t think would yield examples of “burn out” already.