Elementary Explanation: Trying To Understand Pixel Refresh Rate (Was: "New Futuristic Temporal Resolution Hypothesis")
Posted: 29 Feb 2024, 06:57
Disclaimer: This hypothesis is just a little fun thought experiment
An interesting concept came to my mind recently: What if the refresh rate matched the framerate? Would that eliminate all motion blur including Sample and Hold, blur from frame repetition etc. ?
Now I know what you’re thinking: ’’But bro that is Blur Busters 101 ’’
No, this is a bit of a different concept
To explain it a bit more thoroughly let me explain it in a bit more detail:
NO!
Inner Motion Rate in this concept is divided into 2 categories:
Inner Motion Rate:
A demonstration:
Line-level rate calculation: 3840(lines) * 24(fps) = Outer Motion Rate is 92160Hz
Pixel-level rate calculation: 3840x2160(pixels) * 24(fps) = Outer Motion Rate is 199065600hz or about 199.0656Mhz
Why would such an absurdly high refresh rate be neccessary?
You see, in each frame of a 4K video you have you have about 3840 lines horizontally an 2160 vertically, which means that in a 4K video in each frame you have over 8 million pixels.
So ultimately my hypothesis is that if the Refresh Rate matches (Pixel/Line-rate * Video Framerate) then motion blur could be completely eliminated.
Could a display ever be fast enough to achieve an absurd refresh rate like 199.09656Mhz?
I actually did some calculations and it turns out that you it’s about 5 nanoseconds so technically a MicroLED display has a response time that is fast enough to do it.
Will we ever have the neccessary bandwidth to ever try it?
Now this is a toughie, and I can’t say for sure. Even with compression techniques like Display Stream Compression it will take a long time before we can ever do it.
This hypothesis could of course be tested out with much lower resolutons and frame rates( for example 320x240 * 10fps= Pixel Rate of 768000hz or 160x120 * 10fps = Half of that).
Line level rates could be tested in the lab with low resolutions/framerates right now( e.g 320 lines x 10fps video = Only requires 3200hz), that is assuming they are using Emissive LED screens with 0 GtG. This is based on Chief saying in reddit that they already have 20Khz refresh rate displays on the lab.
But Pixel level refresh rates lke 768000hz seem to be beyond the scope of what we can do right now.
And that is all !
I may be wrong, I may be right. But it’s fun to hypothesise.
An interesting concept came to my mind recently: What if the refresh rate matched the framerate? Would that eliminate all motion blur including Sample and Hold, blur from frame repetition etc. ?
Now I know what you’re thinking: ’’But bro that is Blur Busters 101 ’’
No, this is a bit of a different concept
To explain it a bit more thoroughly let me explain it in a bit more detail:
- Outer Motion Rate: This is self-explanatory as in the refresh rate denoting how many times the display refreshes per second
NO!
Inner Motion Rate in this concept is divided into 2 categories:
Inner Motion Rate:
- Line-level rate: In this concept it denotes the horizontal lines of the resolution of the video multiplied by the framerate of the video(e.g 3840 times 24fps)
- Pixel-level rate: In this concept it denotes every pixel of the video multiplied by the framerate of the video(e.g 3840x2160 times 24fps)
A demonstration:
Line-level rate calculation: 3840(lines) * 24(fps) = Outer Motion Rate is 92160Hz
Pixel-level rate calculation: 3840x2160(pixels) * 24(fps) = Outer Motion Rate is 199065600hz or about 199.0656Mhz
Why would such an absurdly high refresh rate be neccessary?
You see, in each frame of a 4K video you have you have about 3840 lines horizontally an 2160 vertically, which means that in a 4K video in each frame you have over 8 million pixels.
So ultimately my hypothesis is that if the Refresh Rate matches (Pixel/Line-rate * Video Framerate) then motion blur could be completely eliminated.
Could a display ever be fast enough to achieve an absurd refresh rate like 199.09656Mhz?
I actually did some calculations and it turns out that you it’s about 5 nanoseconds so technically a MicroLED display has a response time that is fast enough to do it.
Will we ever have the neccessary bandwidth to ever try it?
Now this is a toughie, and I can’t say for sure. Even with compression techniques like Display Stream Compression it will take a long time before we can ever do it.
This hypothesis could of course be tested out with much lower resolutons and frame rates( for example 320x240 * 10fps= Pixel Rate of 768000hz or 160x120 * 10fps = Half of that).
Line level rates could be tested in the lab with low resolutions/framerates right now( e.g 320 lines x 10fps video = Only requires 3200hz), that is assuming they are using Emissive LED screens with 0 GtG. This is based on Chief saying in reddit that they already have 20Khz refresh rate displays on the lab.
But Pixel level refresh rates lke 768000hz seem to be beyond the scope of what we can do right now.
And that is all !
I may be wrong, I may be right. But it’s fun to hypothesise.