
"If you look at an OLED display off-angle, you might notice slight shifts in color and hue. This is a characteristic of OLED and is normal behavior. With extended long-term use, OLED displays can also show slight visual changes. This is also expected behavior and can include “image persistence” or “burn-in,” where the display shows a faint remnant of an image even after a new image appears on the screen. This can occur in more extreme cases such as when the same high contrast image is continuously displayed for prolonged periods of time. We’ve engineered the Super Retina display to be the best in the industry in reducing the effects of OLED "burn-in."-Apple
The support page lists several suggestions on how to enhance the positives of using an OLED display with the iPhone X. These include making sure that the phone is always updated to the latest version of iOS, using Auto-Brightness, and having the screen shut off in the fastest time that you can live with. To lessen the chances of burn-in, iPhone X users should not allow static images to stay on the screen in maximum brightness for long periods of time.
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