4 ms·

Your eyes being analog and the 60Hz display being offset from your own cycle frequency would play large roles in that.

by Kudos 2y ago

DoctorOetker 2y ago
the phenomenon I describe is much simpler, and is remediated by having the backlight of a 60 Hz display have a very short single on strobe. If they backlight remains on or flashes multiple times during a single frame then the pixel will draw a long streak on the retina (because the eye was rotating to track a depicted moving object)
- thfuran 2y ago
  Sample and hold motion blur during smooth pursuit is far from the only visual artifact resulting from low frame rates.
  - wizzwizz4 2y ago
    What are others?
    - thfuran 2y ago
      I'm not sure if you've seen them, but there are LED glow sticks that look normal when stationary but leave sort of a trail of distinct after images rather than a smooth blur when waved. I've seen LED Christmas lights that have a similar effect when you scan your eyes past them quickly. It's called the phantom array effect, and it's caused by a flickering light (LEDs lit with less than 100% duty cycle) moving rapidly across the visual field. Mitigating sample and hold motion blur by blacking out the display for some of the frame time turns your display into a flickering light source, so it can potentially produce the same effect for small bright objects on dark backgrounds when either the object moves rapidly on screen or you scan your eyes across the screen. It's fairly niche in that it'd only affect some rather specific scenes and even then can depend on how the scene is viewed (it won't occur if you track the only fast-moving bright object with your eyes, and it's much reduced in higher ambient light), but the flicker fusion rate is generally several kilohertz, so you'd need to boost the hell out of the frame rate to guarantee the effect is eliminated altogether. More generally, an object that is moving rapidly enough for its screen position to change by many pixels per frame can have its motion look jerky even without motion blur. And, in fact, motion blur can help disguise that.
nico 2y ago
This is a very interesting concept Is there a way to sync the monitor’s refresh rate to a different phase/offset? It would be cool to play with that setting and see the effects on our perception of the screen
- coffeebeqn 2y ago
  Not much of an electrician but wouldn’t the phase kind of randomly reset every time you turn the monitor on and off? Our eyes are good at adapting to all kinds of things - like really small red, green and blue lights in an array can look like anything to us
  - nico 2y ago
    That makes a lot of sense About turning the screen on and off, it’s very slow if I want to change it in real time. It would be nice to have a little nob on the side and just change the phase one way or the other in correspondingly :)
thfuran 2y ago
Eyes don't have a synchronous cycle. Every individual receptor has a relaxation time starting from the last excitation.

Your eyes being analog and the 60Hz display being offset from your own cycle frequency would play large roles in that.

by Kudos 2y ago

Your eyes being analog and the 60Hz display being offset from your own cycle frequency would play large roles in that.

the phenomenon I describe is much simpler, and is remediated by having the backlight of a 60 Hz display have a very short single on strobe. If they backlight remains on or flashes multiple times during a single frame then the pixel will draw a long streak on the retina (because the eye was rotating to track a depicted moving object)

thfuran 2y ago
Sample and hold motion blur during smooth pursuit is far from the only visual artifact resulting from low frame rates.
- wizzwizz4 2y ago
  What are others?
  - thfuran 2y ago
    I'm not sure if you've seen them, but there are LED glow sticks that look normal when stationary but leave sort of a trail of distinct after images rather than a smooth blur when waved. I've seen LED Christmas lights that have a similar effect when you scan your eyes past them quickly. It's called the phantom array effect, and it's caused by a flickering light (LEDs lit with less than 100% duty cycle) moving rapidly across the visual field. Mitigating sample and hold motion blur by blacking out the display for some of the frame time turns your display into a flickering light source, so it can potentially produce the same effect for small bright objects on dark backgrounds when either the object moves rapidly on screen or you scan your eyes across the screen. It's fairly niche in that it'd only affect some rather specific scenes and even then can depend on how the scene is viewed (it won't occur if you track the only fast-moving bright object with your eyes, and it's much reduced in higher ambient light), but the flicker fusion rate is generally several kilohertz, so you'd need to boost the hell out of the frame rate to guarantee the effect is eliminated altogether. More generally, an object that is moving rapidly enough for its screen position to change by many pixels per frame can have its motion look jerky even without motion blur. And, in fact, motion blur can help disguise that.

nico 2y ago

This is a very interesting concept Is there a way to sync the monitor’s refresh rate to a different phase/offset? It would be cool to play with that setting and see the effects on our perception of the screen

coffeebeqn 2y ago
Not much of an electrician but wouldn’t the phase kind of randomly reset every time you turn the monitor on and off? Our eyes are good at adapting to all kinds of things - like really small red, green and blue lights in an array can look like anything to us
- nico 2y ago
  That makes a lot of sense About turning the screen on and off, it’s very slow if I want to change it in real time. It would be nice to have a little nob on the side and just change the phase one way or the other in correspondingly :)

thfuran 2y ago

Eyes don't have a synchronous cycle. Every individual receptor has a relaxation time starting from the last excitation.