3 ms·

Are you sure it's your backlight and not your eyes? (Something like this: https://en.wikipedia.org/wiki/Motion_aftereffect https://en.wikipedia.org/wiki/Motion_

by lysium 5y ago

Are you sure it's your backlight and not your eyes? (Something like this: https://en.wikipedia.org/wiki/Motion_aftereffect https://en.wikipedia.org/wiki/Motion_aftereffect)

danuker 5y ago
One way to be sure is to film it and analyze the pixels before and after a strobe test.
- Retr0id 5y ago
  I did this (well, I don't have any "before" footage, but I can assure you there was no flicker). Video here: https://twitter.com/David3141593/status/1456399950976278532 https://twitter.com/David3141593/status/1456399950976278532
Retr0id 5y ago
I caught the flickering on camera (see my other reply). Furthermore setting the display to 60fps (as opposed to 120Hz "ProMotion" VRR) made the flickering go away, and it would come back when I switched back to 120Hz.
- lewispollard 5y ago
  I've seen this on my phone's 120hz display too (S21 Ultra) and haven't yet determined the cause, but maybe it is related to strobing content. Will have to remember that the next time I notice it.
- gruez 5y ago
  That still might be to your eyes. The relevant effects are: 1. effects from your eyes (from looking at the strobing image) 2. PWM brightness controls causing your recordings to look like they strobe The site in the OP wasn't working, so I tried a demo site instead: https://www.da.vidbuchanan.co.uk/strobegate.html https://www.da.vidbuchanan.co.uk/strobegate.html. I looked at the strobing image, closed the tab, and sure enough my monitor (IPS, 60hz) was showing some signs of flickering. It disappeared after a few minutes. However, I performed a second test where I opened the site and didn't look at it with my eyes. The strobe after effect did not show up. Even though I didn't look at the monitor, I verified afterwards that a strobe was shown by a phone video recording. I also did a slo-mo video recording of my monitor without any visible strobe effect, and there was visible strobing in the recording, probably from the shitty PWM. You should follow a similar procedure to rule out whether it's something with your eyes or not.

by lysium 5y ago

Are you sure it's your backlight and not your eyes? (Something like this: https://en.wikipedia.org/wiki/Motion_aftereffect https://en.wikipedia.org/wiki/Motion_aftereffect)

danuker 5y ago

One way to be sure is to film it and analyze the pixels before and after a strobe test.

Retr0id 5y ago
I did this (well, I don't have any "before" footage, but I can assure you there was no flicker). Video here: https://twitter.com/David3141593/status/1456399950976278532 https://twitter.com/David3141593/status/1456399950976278532

Retr0id 5y ago

I caught the flickering on camera (see my other reply). Furthermore setting the display to 60fps (as opposed to 120Hz "ProMotion" VRR) made the flickering go away, and it would come back when I switched back to 120Hz.

lewispollard 5y ago
I've seen this on my phone's 120hz display too (S21 Ultra) and haven't yet determined the cause, but maybe it is related to strobing content. Will have to remember that the next time I notice it.
gruez 5y ago
That still might be to your eyes. The relevant effects are: 1. effects from your eyes (from looking at the strobing image) 2. PWM brightness controls causing your recordings to look like they strobe The site in the OP wasn't working, so I tried a demo site instead: https://www.da.vidbuchanan.co.uk/strobegate.html https://www.da.vidbuchanan.co.uk/strobegate.html. I looked at the strobing image, closed the tab, and sure enough my monitor (IPS, 60hz) was showing some signs of flickering. It disappeared after a few minutes. However, I performed a second test where I opened the site and didn't look at it with my eyes. The strobe after effect did not show up. Even though I didn't look at the monitor, I verified afterwards that a strobe was shown by a phone video recording. I also did a slo-mo video recording of my monitor without any visible strobe effect, and there was visible strobing in the recording, probably from the shitty PWM. You should follow a similar procedure to rule out whether it's something with your eyes or not.