Thanks.. good info. From that table, it seems even LCD screens notebooks are using PWM, so does it mean PWM not limited to OLED? Previously, it was reported that LCD use analog dimming which actually dims LED backlight to reduce brightness but OLEDs use PWM.
Also, what's the relation between brightness level and PWM? And if LCDs can dim its backlight OLED without PWM then why not use the same technique in OLED screens?