Apple's next-generation iPhone 12 range will include OLED panels across all four Pro and non-Pro models, but there will be key differences. According to @EveryApplePro and @mweinbach, the 120 Hz ProMotion high refresh rate technology will be a key differentiator on the Pro models.
https://www.notebookcheck.net/New-iPhone-12-details-leak-120-Hz-ProMotion-display-confirmed-for-Pro-models-only-larger-battery-improved-Night-Mode.464728.0.html
Both the article and former rumors mention all the models will have OLED screens. But on the picture, it is written "Standard LCD display" at the models on the left.