Following the launch of LG's pOLED displays, we had many recent discussions and reports of OLED burn-in and Image-Retention. Apple now released a support document for the iPhone X, its first OLED phones, in which it warns users that “image persistence” or “burn-in” is an "expected behavior".
Apple says it engineered the display to be the best in the industry in reducing the effect of OLED burn-in, though. Apple also says that its OLED could have noticeable but slight shifts in color and hue when seen off-angle. The iPhone X has a 5.8" 1125x2436 Samsung-made Super AMOLED display.