Acer xb271hu - pixel brightness "shimmer" defect or normal?

[sfbb2]

When I turn on the monitor after it has been off for a while (1hr+) it has alternating levels of bright/dim in vertical bands. They disappear after the monitor has been on for some minutes (~5-10). The effect is more apparent at lower framerates (such as HotS being capped at 60 fps on title screen), but is still there at 144hz as well.

Example - initial "cold" turn on of monitor:
https://i.imgur.com/Avc4rnI.jpg
https://i.imgur.com/eulPOSm.jpg

After ~30 minutes:
https://i.imgur.com/VIqU3is.jpg
https://i.imgur.com/sETRICj.jpg

On the pixel inversion test (https://www.testufo.com/inversion) it shows as alternating light and dark horizontal lines on the moving pattern.

Cold start of monitor (not pc) with G-SYNC off, 144hz (easy to see the bands):
https://i.imgur.com/PZGaJwc.jpg

Looks like it takes ~20 minutes for the inversion test to look normal:
https://i.imgur.com/TX2V2hb.jpg

If this is normal for the xb271hu (and/or pg279q, xg2703-gs) it is otherwise an excellent monitor. I am worried it may be a hint that a component failure is imminent though.

Any advice appreciated,
-sf

[jorimt]

As far as I can tell from your screenshots, it's normal.

I own the identical monitor, and I get very minor inversion artifacts, especially in 60 FPS content. This panel is an IPS "type," not a traditional IPS (the latter does not have fast enough native GtG transitions for such high refresh rates currently), so, yes, while inversion isn't nearly as bad as on a TN panel, it's there.

[RealNC]

LCDs are also affected by temperature. A cold LCD performs worse than a warm one. Which is why after 20 minutes it gets better.

[sfbb2]

Thanks for the advice, it is greatly appreciate. So long as it isn't anything indicating a failure I feel much better about keeping it now.

[Chief Blur Buster]

For the earlier images, looks like probable interactions with motion and inversion, but a video would help more for that one.

For the latter images, these are normal.

Inversion is a tricky to get perfect. Inversion artifacts vary a lot but these are common for high-Hz TN panels, and to a lesser extent, IPS.

Warmed up LCDs will generally produce fewer artifacts. Pixel response is faster when warm. This temperature sensitivity manifests itself rather more visibly on VA LCDs than TN LCDs, but can also affect IPS too. Winter time amplifies the cold-vs-warm artifact differences on many television sets and computer monitors -- no LCD is immune to temperature effects.