Samsung was first to unveil patents for in-display selfie cams, but Oppo one-upped the Korean giant by presenting working phone prototypes integrating in-display cameras. While Samsung is now strongly considering to add in-display cams to the upcoming Galaxy S21 launching next year, Oppo could still be first-to-market, if its prototypes showcased last December are any indication.
https://www.notebookcheck.net/Upcoming-Galaxy-S21-could-be-Samsung-s-first-handheld-sporting-an-under-display-selfie-cam.460716.0.html