DisplayMate looked at the iPhone X display to evaluate it in every aspect of the new OLED screen, from the superior resolution to automatic color management, to the viewing angles. In the end, it is defined as “the most innovative display and the highest performance ever seen on a smartphone“. DisplayMate also praises Samsung, which produced “exceptional display hardware“.
Specifically, the iPhone X has exceeded every rating in the categories: absolute maximum color precision, maximum full-screen brightness, maximum contrast in ambient light, improved contrast ratio. In addition, DisplayMate has recorded recordings for low variability and excellent brightness in viewing angles:
While Smartphones are primarily single viewer devices, the variation in display performance with viewing angle is still very important because single viewers frequently hold the display at a variety of viewing angles. The angle is often up to 30 degrees, more if it is resting on a table or desk. While LCDs typically experience a 55 percent or greater decrease in Brightness at a 30 degree Viewing Angle, the OLED iPhone X display shows a much smaller 22 percent decrease in Brightness at 30 degrees. This also applies to multiple side-by-side viewers as well, and is a significant advantage of OLED displays. The Color Shifts with Viewing Angle are also relatively small. See the Viewing Angles section for the measurements and details.
DisplayMate also explains that the iPhone X supports two color ranges: the sRGB / Rec.709 for the most commonly used content and the DCI-P3 range for higher quality content. These two color ranges allow “… to have correct and natural colors, without over saturation or under-saturation“.