Counterpoint Research estimates that OLED smartphone sales will reach 600 million units next year, as phone makers adopt OLED displays in more mid-range and low-end devices.

OLED smartphone penetration by company (2020, Counterpoint)

Counterpoint says that OLED penetration in Samsung devices will surge from 45% in 2019 to 71% in 2020. Both Apple and Oppo will use OLED displays in 50% of their phones next year.