I'm looking at this page:

https://www.testufo.com/inversion#pattern=distortion&ppf=5

The instructions there are very brief:

This is a test for LCD monitors for inversion artifacts. (e.g. fine checkerboard pixel patterns, color distortions)

Can anyone elaborate on that? I see a "fine checkerboard pixel pattern" both in the "Moving" area and the "Stationary" area, but I think that's normal. Also what kind of color distortions should I look for? (and in which of the 2 areas?)

… and that's just on the first test on that page. So the same questions apply to the other 4 inversion tests.

Each inversion test image is designed to create a visual effect for only 1 type of pixel inversion. There are multiple ways of implementing pixel inversion (every pixel per frame, alternating pixels, alternating sub-pixels etc). You should only see movement in the test image if your monitor uses that type of inversion.

    Seagull Thanks. Should I be looking at the "moving" part of the test, or the "stationary" part?

      Seagull Thanks. I tried those lagom.nl tests. Saw no flicker (with the naked eye).

      Also tried those:

      http://www.techmind.org/lcd/index.html

      But saw no flicker either. I wonder why.

      The techmind page says:

      one of them should cause your screen to flicker. This is not a fault with the screen, but enables you to find out which inversion scheme your screen uses.

        Every LCD has some degree of inversion on a pattern that it matches.

        Looking for inversion isn't all that helpful because it's not avoidable.

          10 days later

          Seagull

          Screen: Dell 2408WFP (connected over HDMI)

          GPU: Intel HD Graphics 620.

          I also have a nVidia GPU on this machine but have disabled it in Device Manager.

          Sunspark I think it's avoidable (well, "reducible") by picking a monitor that has the least amount of inversion.

          dev