Apple frenemy Samsung has secured the supply of 80 percent of Apple's iPhone 12 OLED display orders according to Digitimes. The remainder of the OLED panel supplies are said be supplied by both LG and BOE.
https://www.notebookcheck.net/80-of-iPhone-12-displays-to-be-supplied-by-Samsung-LG-and-BOE-to-pick-up-the-rest.466870.0.html