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BloodyHell619 You can find flicker-free monitors on RTINGS (here's a list: https://www.rtings.com/monitor/tests/motion/image-flicker), and then verify that it doesn't use FRC on https://www.displayspecifications.com
Problem is that RTINGS uses a photodiode tool that is not powerful enough to detect very high frequency PWM, so they may say that a monitor is flicker-free when it actually has PWM at very high frequency (reason why they couldn't show the 118Khz PWM on this review of the MacBook Air 13 2020: https://www.rtings.com/laptop/reviews/apple/macbook-air-13-m1-2020) but I think that it doesn't happen often
Only real solution is to buy a monitor that has already been tested by someone for PWM and dithering or buy an oscilloscope to test PWM and a tool like this: https://ledstrain.org/d/1903-gear-used-by-notebookcheckcom to test dithering
You can also ask the support of a brand the list of their monitors that doesn't use PWM nor dithering (like he did for BenQ: https://ledstrain.org/d/1341-monitors-that-dont-use-temporal-dithering)