how can it be that i can clearly see both pwm dimming and ripple in most led light bulbs, but have none of the symptoms oled pwm schizos report?here are some of the things they report experiencing:>eye strain>headaches>dizziness and vertigo>concentration problems>blurred vision>insomnia
>>107067728modern OLEDs don't flicker at the refresh rate dummy
>>107067728The led semiconductor can't respond as fast as the PWM circuit
>>107067728>can clearly seeGet better(worse) bulbs>>107068875It doesn't need to. The primary thing that PWM does is to reduce the power output. So, even if the LED can't respond fast enough, it'll be operating around a voltage between the maximum and minimum.
>>107067728probably because you don't use it for very long and go outside
OLED?Idk about those but I've using samsung for years (IPS/TN?, TN and VA) and only the newer with VA panel does something weird if I dim it below 30% of brightness (I usually use my screen between 10-20%, don't ask why).If I had to describe it it seems like the refresh rate of the red channel is halved and/or it's working with a phase difference than the rest of colors, it's easy to notice if you wave your hand using the monitor as only source of light, the red "separated" by time.
>>107068875neither can oled
>>107067728because you have more simple vision than the people complainingyou're only noticing pwm flicker in bulbs because of peripheral vision, as the bulb is lighting up the roomthe oled screen is small, and can not put out much light in the first place because it is oled
>>107068875>>107068926normal leds turn on in the order of nanosecondsit would take a GHz driver to outpace an ledmost led drivers run in the kHz, not even into MHzmost led drivers also include some kind of output smoothing and are only 'pwm' internally, the output current is relatively smooth. it should be for emi.most led lightbulbs aren't driven like that though, they are driven from a dropped line voltage at line frequency, smoothed with some inadequate low pass to keep costs minimal.incandescent bulbs were black body, they heat up to produce light, this is slow and acts as low pass. fluro tubes have phosphor which helps a little bit in the same way. white leds are also phosphor, but again for cost sake cheap led bulbs wont have full wave rectification so the led is only on half the cycle unlike incandescents or tubes. the led also has a switch on threshold so isn't emitting for some amount of time in the forward current half of the cycle.
>>107070995full wave rectification is very cheap no reason to not use some cheap semiconductor bridge rectifier
