Blur Busters Forums

Hi, I've recently found a ZZanya video on youtube about OLED displays (video is in Russlan). It was said in the video and proven with tests, that amoled displays on smartphones have programmed ghosting for a few frames. Author said, that he submitted that problem to this forum, and for that time had no clue why is ghosting a thing on smartphones. I'm not sure, if problem was already solved here, video is year old.

I have my own assumption. Amoled displays have burn out problem, where pixels used more often are getting darker on the end of their lives. In many ads about such displays, companies write, that they have some "technology", which helps displays live longer, but I've never seen an explanation about how they do it.

In tests of ZZanya only pixels that changing from dark to light are getting ghosted, and not from light to dark, so overall image is getting darker, and display probably lives longer. So that may be a supersecret technology for saving amoled from burning out.

OLED can still use overdrive algorithms, just as LCD can do.

AMOLED requires some minor overdrive algorithms, but mobile AMOLED screens often avoid overdrive algorithms completely.

So mobile OLEDs do sometimes ghost slightly more than desktop OLED even if they ghost much less than LCD.

Chief Blur Buster wrote: ↑

13 Mar 2023, 01:56

OLED can still use overdrive algorithms, just as LCD can do.

AMOLED requires some minor overdrive algorithms, but mobile AMOLED screens often avoid overdrive algorithms completely.

So mobile OLEDs do sometimes ghost slightly more than desktop OLED even if they ghost much less than LCD.

The specific video OP seems to be talking about is this: https://youtu.be/VrZf-6FBFCE?t=1228
Very fascinating, I never knew AMOLED's do this.
I wonder, do P-OLED smartphones exhibit this behaviour too? I doubt PWM dimming does them any favour in regards to motion handling either.
Wish response times tests of smartphones were more prevalent today, along with some 240hz offerings.

kyube wrote: ↑

13 Mar 2023, 10:47

I doubt PWM dimming does them any favour in regards to motion handling either.

Until the PWM controller is configured to the same frequency as the refresh cycles, aka PWM=framerate=Hz.

Then CRT motion clarity beauty. But not everyone likes CRT flicker.



The PSVR2 headset uses the PWM=framerate=Hz technique of OLED motion blur reduction.

I own a Poco F3 and my perception of blur is minimal when testing side-scroller games or 3D shooters.

It's not the ideal CRT-style crisp motion that i wish so much, but it's not a blurry mess for all that, like your typical sample-and-hold display.

Maybe the smaller size of the screen gives this impression.