After reports from users and reviewers alike that the Pixel 2 XL's P-OLED display is coming with irregularly lit pixels resulting in scattered brightness spots and dull colors in comparison to, say, Samsung flagships' default mode, even in the "vivid" regime, now comes another serious issue - screen burn-in. We thought that burn-in is a thing of the past with OLED displays, as only the first generations struggled with the challenge to prolong the lifespan of the blue LEDs that were made of ingredients that degraded quicker than the other colors.
Now, however, some Pixel 2 XL users are reporting that they can see ghosting of the navigational strip at the bottom of the display when you show a gray background there. It's only been a few days since the official release date of the Pixels, and, if the problem persists, this might turn into a classical case of burn-in that will only become more visible with time. That is why when asked for comment, a Google spokesperson said that they will be looking deeper into the matter:
The Pixel 2 XL reportedly uses a panel very similar to the LG V30, and there were reports about uneven brightness with the V30's preview units, but on the retail version which we got recently, everything was fine in that respect, so hopefully these are teething problems with the first batches, and Google will come out with the reason for these mishaps soon.
source: The Verge