If it’s as low as 240hz, anyone will see a stop motion effect by waving an open hand in front of the screen at 50% brightness.

I’m curious if this is a harmonic mode for a high speed PWM where pulses are either not even widths or the driver loses some power at the 240hz cycle. May perceive similarly.

I have a couple windows laptop workstations with high dpi OLEDs (one with 240hz refresh rate) that I love and don’t perceive this so I’ll have to check.

I have one of these laptops, I tried waving my hand in front of the screen at 50% brightness and I don't observe anything unusual.

I think I am pretty insensitive to this effect, though. Other than occasional seeing a bit of 60 Hz flicker out of the corner of my eye from Christmas lights, automotive LED tail lights, etc. I don't tend to notice flicker.