Hello joysterr,
Thank you for using Apple Support Communities! I understand that you're experiencing an issue with the display on your new iPhone XS. While not common, it is possible to see unexpected changes in the OLED display on your iPhone as mentioned here:
About the Super Retina display on your iPhone X, iPhone XS, and iPhone XS Max - Apple Support
"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.""
If you have concerns that this is what you're encountering with your iPhone, or suspect there may be a different hardware issue with the display, I suggest visiting an Apple Store or Apple Authorized Service Provider for further diagnosis:
Apple - Find Locations
If you plan to visit an Apple Retail Store, make a Genius Bar reservation here:
Genius Bar Reservation and Apple Support Options - Apple
Take care!
