I had to scroll a bit to make sure this answer was here before I wrote the same. 👍
Comment on How are 144hz screen possible?
JustEnoughDucks@feddit.nl 1 year ago
72 Hz was used as a refresh rate for CRT monitors back in the day. 72 * 2.
It is likely a holdover from that era. I think from there is was a multiple of 24 HZ so movie content scaled smoothly without tearing before vsync? Last part is a guess.
s38b35M5@lemmy.world 1 year ago
zephr_c@lemm.ee 1 year ago
Old reel projectors actually flashed their light at 72Hz. They had to turn off the light to move the reel to the next slide so you couln’t see the pictures moving up off the screen, and human eyes are better at spotting quickly flashing lights than they are at spotting microstuttery motion, so flashing the bulb once per frame at 24Hz in a dark room was headache inducing. The solution they came up with was just to flash the bulb 3 times per frame, which is 72Hz.