The elevator pitch for the Pixel 4 duo is "90Hz screens and dual cameras". The two flagships come at the tail end of 2019 and represent Google's views of the current perfect Android phone. The screens are just about the only thing that sets the two models apart. The Google Pixel 4 features a 5.7" OLED panel with 1080p+ resolution. The XL model gets a larger, sharper 6.3" display with QHD+ resolution. In both cases, the aspect ratio is a clean 19:9 - there are no notches to complicate UI layout. There is a bit of a forehead that houses a lot of hardware, but more on that...
Source: https://www.gsmarena.com/pixel_4_and_4_xl_go_official_with_90hz_oled_screens_and_new_telephoto_cameras-news-39637.php