The panel in Google’s just announced Android smartphone, The [Pixel 4 XL] features a 90Hz 6.3" 1440x3040 (537 PPI) P-OLED display produced by LGD (P-OLED).
Display measurement experts DisplayMate reviewed the display and found that it is a state-of-the-art flexible OLED display that sets or matches several records, including the highest absolute color accuracy, the lowest screen reflectance and the smallest brightness variation with viewing angle.
Source: OLED Info.