KM
You are right, I can't be sure without a similar good device to compare with, but I did devise a test regardless. When you say "Android" I presume you mean the dithering that many of us suspect android uses.
I covered the screen of an amoled phone (nexus 6) with paper, with the screen set to maximum brightness. The paper allowed enough light through to make out colours and shapes displayed on the screen but no more. It induced the same eye pain/migraine symptoms as without the paper covering the screen. I haven't explored this as much as I could have, but I think the paper obscured/blurred enough of whatever image the phone was displaying that any fine dithering would have been lost. Therefore, I concluded the strain was due to the 60hz pwm-like flicker, as the paper would not obscure whole screen flickering/pwm.
I wonder if the test equipment used to make pwm graphs isn't sensitive enough to capture just how sharply LEDs/OLEDs can illuminate, given than an LEDs could illuminate about ten times faster than these graphs show.
https://electronics.stackexchange.com/questions/86717/what-is-the-latency-of-an-led
