Flickering/Fuzzing/Dithering on Blacks/Greys via HDMI. PC Monitor

I have a 24” Full HD Samsung S24A350 PC Monitor. I use it for my Xbox 360 via HDMI.

I notice on blacks and greys, when looking closely to them, I see a dithering effect over the black/grey areas. The best way I can describe it is that it seems like the pixels are flickering and moving about and aren’t staying perfectly still.

I know this isn’t an issue with my monitor as I’ve also tried it on my 24” Full HD TV and I get the same effect. However, on my 32” HD Ready TV I don’t get this issue at all, so I’m wondering if it could possibly be an up scaling issue with my monitor being full HD?

Has anyone else noticed this before when using a monitor with Xbox 360?



Discussion Info

Last updated July 4, 2018 Views 8 Applies to:

If it's a pixel-sized checkerboard pattern, then it's the frame-rate control (FRC) in the display panel at work dithering the picture to simulate more intermediate shades than the panel natively supports. It's a brute force method of improving gradation where greater precision (more bits in the DAC for smaller voltage changes) would no longer help align the liquid crystal as desired.

It's particularly noticeable on TN panels common in PC monitors. Other panel types use dithering as well, though the way they align the liquid crystal may allow for higher native precision and make dithering less noticeable.

Really common artifact when playing games that render at 720 or below that then have to be upscaled by the 360. When you are playing is the 360 set to output 1080? It's possible that you could set the image output to 720 and let your monitor handle the scaling instead of the 360. For whatever reason the 360 has been known for black gradient artifacts. On the old forums there was a thread about what could be causing it. Seems like a hardware issue as it shows up in multiple games with different engines.

Thanks for your replys guys. So this is an issue with FRC? Makes sense, it just seems to happen much worse on gradients.

But it also happens in Windows, not just an Xbox issue it seems, it may just be a MONITOR issue.

Has anyone else noticed this?

Have you tried using different HDMI cables? I just bought a cable and when I connected it to my TV and some black parts started flickering as well.

I've tried a different HDMI cable...

No one else notices this when using a PC Monitor? :/

I know you said your monitor is full HD; which I'm assuming it has the capability of doing 1080p.  Now have you tried using different resolutions?