Yeah, the 180 vs 360 confusion, I'm wondering about that.
I'm talking about the XL2411T (my unit appeared to have 360Hz PWM during 120Hz refresh), not the XL2411Z (PWM-free).
Also, the 18KHz PWM is actually made essentially PWM-free via the smoothing electronics:
so the fast PWM signal is converted to some analog maximal LED current by the LED driver and the fast PWM frequency cannot be found in the luminance traces anymore – the backlight is truly flicker-free.
- From the same page you linked.
Also, I think some monitors did 180Hz PWM during 60Hz, but went up to 360Hz PWM during 120Hz. That may be where the confusion of the 180/360 comes from for the XL2411T, or the different revisions (e.g. XL2411T firmwares). That might be it? I'll ask StrobeMaster.