I very easily can. I had to get rid of an otherwise good monitor a few years ago before I knew it used PWM to control the backlight (and before I even knew PWM was used at all for this functionality — I only had experience with CCFL backlight before that).
It was really annoying to look at, like looking directly at cheap fluorescent lighting. Miraculously, setting brightness to 100% fixed the issue.
By googling around, I found that it used PWM with a modulation frequency of 240 Hz, with a duty cycle of 100% at full brightness, which explained everything.
I can also easily perceive flickering of one of my flashlights, the only one that uses PWM at a frequency of a few hundred hertz. Other flashlights either run at multiple KHz, or don't use PWM at all, and either one is much easier on the eyes.
Some of us really do perceive this stuff, which can be hard to believe for some reason.
Like back when CRTs were mainstream you'd have those computer labs with monitors set to 60-85Hz and most people wouldn't notice, but some would. I definitely did, I couldn't stand looking at a CRT set to less than 100 Hz for more than an hour.
Absolutely, I also had massive issues with them, ending with red eyes and headaches within an hour of use. Getting my first LED monitor (with a CCFL backlight) was out of this world.
> You can't perceive that
I very easily can. I had to get rid of an otherwise good monitor a few years ago before I knew it used PWM to control the backlight (and before I even knew PWM was used at all for this functionality — I only had experience with CCFL backlight before that).
It was really annoying to look at, like looking directly at cheap fluorescent lighting. Miraculously, setting brightness to 100% fixed the issue.
By googling around, I found that it used PWM with a modulation frequency of 240 Hz, with a duty cycle of 100% at full brightness, which explained everything.
I can also easily perceive flickering of one of my flashlights, the only one that uses PWM at a frequency of a few hundred hertz. Other flashlights either run at multiple KHz, or don't use PWM at all, and either one is much easier on the eyes.
Some of us really do perceive this stuff, which can be hard to believe for some reason.