It's not about whether you can "see 240Hz". CRT phosphors have sustain, while OLED does not. The fully-on, fully-off cycle, if infrequent enough, causes some sort of visual stimulation that some brains absolutely do not like. You don't have to see it to feel it.

Sometimes I can tell flickery fixtures because they just "feel more staticky". I don't get visual eyestrain or nausea though.

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mrob an hour ago | parent | next [-]

>CRT phosphors have sustain

Other than some old monochrome CRTs, all CRT phosphors decay too fast to prevent flicker. You get some softening of the trailing edges of the phantom array images, but they're not actually blurred together like on a sample-and-hold display. And even the fastest CRTs have fairly low refresh rates, making it more obvious.

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ZyanWu an hour ago | parent | prev [-]

> You don't have to see it to feel it.

It's not magic. :) You DO see it. 500 Hz for the median observer; above 800 Hz for some individuals. https://doi.org/10.1038/srep07861

	▲	LoganDark an hour ago \| parent [-]
		This paper appears to be about the DLP effect that happens when a strobing light moves across your vision. Similar, but not the same thing! There is still some ability to percieve strobing at a steady state though, even if the amplitude is reduced by visual persistence.