A moving pixel grid shimmers on some LCDs. Why? [inversion]

[Falkentyne]

I've noticed an annoying phenomenon on some LCDs where moving a grid pattern causes the grid to shimmer.

For example, take this image: http://protie.sweb.cz/checkerboard_1920_1080.gif
View it at 100% and move it around (or zoomed out, depending on the resize algorithm and zoom level).

Does it shimmer on your LCD?

I wonder what causes it. Pixel response? LCD dithering?

That's a bizarre picture.
I think I just found my new game to play when I'm bored.
Reize the picture and watch the shimmering and diamonds! Thank you +rep

Chief can you add that picture to your page ? That's a WONDERFUL image!

[srsbsns]

I've got this really bad on my XL2420z. I thought it was a grounding issue or something. In the UFO test posted above mine is fine for a few loops and then it shimmers then back to being fine. It's more noticeable when gaming where dark blue scenes are.

Why would the flicker/shimmer in this test would come and go about every 20 seconds?

[dclon]

Reize the picture and watch the shimmering and diamonds! Thank you +rep

Just to clarify, I didn't mean that resizing causes the problem. That would just be aliasing from the resize algorithm.

It's more noticeable when gaming where dark blue scenes are.

In what games did you see such patterns?

[srsbsns]

It's more noticeable when gaming where dark blue scenes are.

In what games did you see such patterns?

I believe I misspoke and this issue appears to not be an inversion from the monitor although my monitor shows inversion artifacts in the test. Darker colors just cause this issue to be more noticeable but its not exclusive to them. This happens BF4 but especially WOW.

My problem is a flicker that is a variation of brightness levels. I've found that disabling crossfire causes this problem to go away. I've also found the only thing that fixes it in crossfire mode is enabling V-Sync. This was surprising because the only artifact I expected to see with V-Sync off was tearing.

I've posted a youtube video showing the issue. Please be aware this is very hard to notice over a video. Stare at the center of the video and notice the faint brightness flickering in your periphery. The first 1-2 seconds of the video and the end show it the most.

https://www.youtube.com/watch?v=zRzU-oXPXk0

It's much worse in real life as I'm very sensitive to flicker which is why I went with a flicker free monitor.

Sorry to hijack this thread of any idea on why this happens in a mult-GPU config with V-Sync off?

[dclon]

Thanks. Difficult to see in the video, but I don't know anyway. Better start a new thread, as a relevant thread title is more likely to draw the attention of people who know what it is.

[srsbsns]

I just noticed that upgrading to version 4 firmware on the BenQ XL2420Z fixed the inversion artifacts that were present every few loops. Can anyone else that upgraded confirm ? Using the test below I would get crazy flickering in the moving box every couple of loops on version 3.

http://www.testufo.com/#test=inversion

[Falkentyne]

That box doesn't flicker on V2.
It's different colors (muted) when the rectangles are in motion but there's no flicker.
Sounds like an HTML issue to me or a "strobing" issue sync timing with a VT 1502 tweak, and rebooting fixed it, not firmware.
were you using 120hz and VT 1502? Try VT 1500 if that happens again.