One of the potential downsides to the OLED screens that are making their way into high-end smartphones is screen burn-in. This is something that happens when you have the same items on the screen for extended periods of time, like navigation buttons. Essentially, you end up with ghost images left behind on the screen. Normally this is something

Source: Hot Hardware – Reports Of Pixel 2 XL OLED Screen Burn Stream In As Google Opens Formal Investigation