Hacker News Reader

Not entirely sure but I think OLED pixels modulate brightness with PWM, which causes high frequency (though invisible) flickering.

LCDs have PWM-dimmed backlights, so if your laptop isn't set to maximum brightness, you're probably staring at a flickering surface too.

Perhaps a simpler explanation is just contrast? Both OLEDs and CRTs can produce much higher contrast than LCDs.

The PWM frequency is typically much higher for LCDs than OLEDs, if it is used, and much less likely to be a problem.