What happened to the Samsung AMOLED?
They are still the biggest OLED supplier for handhelds. The iPhone 8 is rumored to feature Samsung's AMOLED screen. Samsung stopped making OLED TV panels since they supposedly had difficulty ramping-up production yields on large panels.
Maybe they feel that they can stretch the current tech long enough (SUHD, QLED, etc.) until they can roll out QD-LED.