Apple has shared a new support document explaining how OLED displays work, stating that it is normal to see some screen burn-in over time and shifts in color when looking at the iPhone display off-angle. From the comments section: it’s funny that they waited until after launch day sales were racked up before they tell told anyone this. According to Apple, when you look at an OLED display from a side angle, you may see shifts in color and hue, something that's a "characteristic of OLED" and "normal behavior." They also say that with extended long-term use, OLED displays can show "slight visual changes," which is also considered normal. The iPhone X has been engineered to be the "best in industry" at reducing burn-in effects, but Apple's support document suggests burn-in is still a problem that some users could potentially see over time.