OLED questions from a visual neuroscientist

[moregabor]

Thanks, that's what I was trying to post.

I should say that the lower plot (photodiode) underestimates the extent of dimming (~10 nits), due to diode saturation issues. But it gives an idea about the time course.

The absence of phospor persitence in OLEDs compared to CRTs is indeed very helpful for some research in my field.

[moregabor]

Since there were no further responses, to close the thread, I am concluding that the dynamic luminance dimming for small objects (but not large ones) on the Asus 240 Hz OLED may be an as-yet unreported or unknown issue.

Thanks everybody for the helpful responses regarding flicker!

[thatoneguy]

Hmmm, well not sure what you mean with the small object comment... maybe Chief can address that.
I’m hypothesizing here but there may be some sort of built-in burn-in mitigation going on.

Some links that may be useful:
https://rog-forum.asus.com/t5/gaming-mo ... d-p/962201
https://old.reddit.com/r/OLED_Gaming/co ... automatic/
https://old.reddit.com/r/OLED_Gaming/co ... ng_screen/
https://old.reddit.com/r/OLED_Gaming/co ... he_screen/

[moregabor]

Apologies for the late response: Some of these links I was not yet aware of, thanks for sharing them!

[Chief Blur Buster]

Apologies for the late response: Some of these links I was not yet aware of, thanks for sharing them!

You're welcome! We're good for discovering a bunch of error margins not considered by other researchers...

Also, for latency of OLEDs, more refresh rate is better.

OLEDs often have to buffer 1 refresh cycle of latency (for things like HDR processing). So more refresh rate reduces the lag penalty.

If lag is critical and you want to use OLED, please purchase 480Hz OLED, even for 60fps material. (Make sure you play back 60fps on a computer outputting 480Hz). This allows these individual 60fps frames to be blasted over the cable in 1/480sec and scanned-out to the screen in 1/480sec.

Unlike CRTs which stream the signal onto the tube in realtime, many digital displays have to buffer the input for full frame processing before displaying.

Disabling HDR can also help reduce latency too, but OLEDs also need to execute "find brightest pixel" algorithms for ABL (average brightness level) algorithms. Turning off HDR and turning off ABL, will probably reduce latency, but will also create a fairly dim (200nit) picture. But a workaround is simply to throw more refresh rate at it instead, to avoid the disadvantages.

[moregabor]

Thanks! We have already invested in a couple of 240 Hz OLEDs, but the newest 480 Hz models do look promising and we might repeat our tests with one of those. We'll acknowledge the helpful input from blurbusters in our work.