Flexible AMOLED has become the mainstream technology for smartphones and smartwatch panels. In particular, Apple's smartphones have accelerated their investment in soft AMOLED panels after their display panels shifted to soft AMOLED technology . On the other hand, the operating profit margin of the AMOLED panel of Samsung Display (SDC) has generally remained at 15-20% in recent years, outperforming the vast majority of TFT LCD manufacturers and increasing the incentive for other companies to invest in soft AMOLEDs.