Does anyone know if the iPhone X is using low frequency pulse width modulation like Samsung OLED phones? Do all OLED displays require pulse width modulation? I am one of the few people who are bothered by screens using low-frequency pulse which modulation (PWM). I can see the flicker of the screen refresh from a few of the Samsung OLED displays when moving my eyes across a display, which is associated with headaches and eye strain. My understanding is that Apple devices have used either very high kHz PWM, or DC dimming techniques for several years now and I have no problems with any Apple display for extended use > 10 hours. From what I've read, it seems that the OLED technology requires steps, including PWM, to avoid burning out the OLED emissive elements. This site suggests that the majority of OLED screens use PWM at 200 Hz: https://www.notebookcheck.net/PWM-Ranking-Notebooks-Smartphones-and-Tablets-with-PWM.163979.0.html The Apple Watch OLED refresh rate seems high enough that it doesn’t bother me, but I can see the refresh rate when using the iPhone slow motion camera. However, I only look at the watch for brief periods of time. Similarly, the MacBook Pro OLED touch bar also seems to be flickering at < 1000 Hz, but I don't look at it that long. I haven't seen any gross flickering of the display on any of the videos showing the iPhone X display, but it's hard to tell as I can't slow down the video speed.