[tom_]

The Atari ST's late 80s monochrome CRT looked a bit like an eink display, with no discernible flicker even at 72 Hz. It certainly looked very different from a 72 Hz colour CRT displaying a monochrome image. I think it used a different type of phosphor.

[icedchai]

You’d need much lower than 72 hz for you to notice flicker. Regular VGA was 60 hz. Amiga interlace had noticeable flicker with an effective rate of 25 to 30 hz.

[steffan]

This is biology-dependent. With CRTs, I could detect flicker all the way up to 85Hz* (where it vanished for me). Made it a real pain to find a good monitor.

* Hitachi 21" CRT which seemed enormous at the time

[icedchai]

You are right. Perhaps I should've phrased it as "most people need..."

The Amiga interlace flicker was bothersome to me. When I got an Amiga 3000 with the built in deinterlacer / flicker fixer, it was like night and day...