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Most modern OLED panels on TVs and monitors don't actually use classic PWM for dimming, they never turn off completely and instead fluctuate between like 100% and 95% brightness based on the refresh rate.
Did you ever test if you can see that as well at different refresh rates?
rtings always tests this under "Image Flicker". https://www.rtings.com/monitor/tests/motion/image-flicker
It's not considered flicker-free but the OLED panels listed with 0 Hz PWM frequency (most of them) should look fine.
However, there are two other elements that might cause issues:
Both can cause an unpleasant experience if you are sensitive to it.
Phones still commonly use PWM because it uses less energy. There are some that have a DC dimming option but it's rare.