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Apple to switch to OLED displays for iPads and MacBooks - Nikkei Asia
(asia.nikkei.com)
This is a most excellent place for technology news and articles.
Even the non-pros have OLED. I think it’s any iPhone with FaceID.
The XR and 11 (non Pro) had LCD. The 12 and 12 Pro have the same exact OLED screen, so that's when they stopped using LCD on the lower models with Face ID.
I think they used Samsung's AMOLED and not LG's OLED. Which are two different techs
Amoled is just a fancy name and filter for oled.