It's not necessarily epileptics. Some people are sensitive to fairly high flicker rates. People have been known to react badly to florescent lights, for example. So there are two factors. One is any actual flicker rate. PWM can easily be far to high for anyone to notice. The second is if there is a beat frequency with some other environmental variation, such as 60 Hz or 120Hz from light fixtures.I don't think making bad taste jokes about those with epilepsy is appropriate on this website.aluminium hats will help!
There are a bunch of variables to juggle, not all of which are under RPT control. The main ones that can be worked with are keeping any PWM frequency high enough to be far beyond any neural activity frequency. Second is the length of image persistence in the panel. And a more distant third would be to make sure that the PWM frequency stays away from multiples of common environmental frequencies--60Hz in the US and 50Hz in many other countries.
This issue is, by the way, as a medical issue hardly limited to monitors. People with implanted pacemakers are generally advised to stay away from induction stoves, which typically operate around 25KHz and can interfere, or even cause a shut down, with pacemakers.
Statistics: Posted by W. H. Heydt — Tue Jan 21, 2025 12:53 am