Usable Smartphones?
We should be a wiki or table with a sucess rate for each phone. Some kind of poll for each phone.
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It atonishes me as I have the xperia xz2 with really low bright and lowered contrast and still give me eyes pain. It's almost dark, but is able to inflict pain. It's really crazy. It's seems impossible to cause pain with such low bright. Like kripotnite. I wonder if there is not pwm at very very high frequencies. Right now I have my phone at 29% safe pwm and use software to decrease bright and other to lower contrast.
tfouto Did you test the screen to make sure you are outside the PWM range? Sometimes Notebookcheck's % values are not that accurate.
Also I couldn't use such dimming apps. Whenever I did, burning eyes. They must trigger temporal dithering. But whether or not they do might depend on the device, GPU/driver.
When I think about how the Dasung shows dither when using f.lux, and various people online said changing colors or brightness (via software) might activate temporal dithering on PCs, that idea, apart from my own experiences, has some backup and might apply for Android, too.
tfouto No, nothing cheaper when you have that camera already. If you see the stripes instantly disappear, Notebookcheck is probably right.
The cheapest equipment would be just a photodiode (like $1?) that you hold against the metal cable end of a headphone and then listen to the humming and see at which brightness setting the sound disappears. Only works below 20 kHz.
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But how much frequency does a 960fps can detect? Isn't suposely just 960hz?
I actually don't use slowmo to detect PWM, but Pro mode of photos in my phone's camera. It allows me to change shutter speed which acts like a filter for PWM. If you set it to low value (below 1/100) it usually shows stripes when frequency of PWM isn't very high and is a multiplication of this shutter speed (ie. if PWM is 4000Hz then 1/2000 should reveal it). It might be wrong, but that's how I understand it 
I know that for example some screens have a little bit off PWM frequency, like 201Hz and with them I couldn't observe stripes as my shutter speed wasn't a fraction of this frequency.
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I made a video with a cheap microscope.
There seem to be background noise on HTC one, with max brightness, seems on backlight.
On Sony XZ 2 not on max brightness there is lots of ficker. Dont know how reliable is the camera.
HTC One: https://1drv.ms/v/s!Ai2kKt-CrSGog4la7Kj7wzV3pRnu9Q
Be careful watching the following video, too much flickering:
Sony Xz 2: https://1drv.ms/v/s!Ai2kKt-CrSGog4lbfMO-b1Gfo0iNqA
Original file: https://1drv.ms/u/s!Ai2kKt-CrSGog4lcKNFY32S7Z0H0lw
For some reason when converting to mp4 didn't convert it to the end.
It's crazy, watching the Sony Video on Computer seems to trigger the symptoms. Have to rewatch it later. Seemed that i had strong symptoms just watching the Sony Video on computer.
Does anyone feel anything by watching the second video?
I don't know.
If the camera is reliable. If is the backlight. If leds itself are unstable. Some kind of dithering. Don't know.
I have often wondered how visible lcd flickering due to inversion is, may be a factor.
That's great - I actually started doing the same thing here: https://ledstrain.org/d/409-screens-under-microscope-in-slowmo-dithering-frc-tests/36 - please post your results / videos there, so they're easier to find. Based on what I found out there - many devices tend to flicker on lower shades of R G B, they may flicker on brighter shades too, but my HTC 10 could only see the flicker when it's darker.