I don't know why, but my original post disapeared... Fortunately I had it saved locally.
Moderator note: it was snagged by the spam filter - which gets overly cranky at times. Since you've recovered nicely, I'll leave that earlier version archived.
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Hi all,
I did a little experiment to confirm my thoughts: that the issue comes from the interference between the pixel arrangement and the touch layer grid.
Below is the picture of the pixels of the OLED panel provided by Andy_Lenovo where I highlighted the diagonal arrangement of the pixels.
If we zoom out we end up with a more a less orthogonal grid like this (this is about 100 pixels wide):
The touch layer grid doesn't have the exact same shape, if you look closely, you'll see that it is flattened (i.e. the diamonds are more wide than tall), like this:
Now, guess what happens if we stack both grids upon each other?
You can see the interference pattern appearing:
I don't have the exact size and shape of neither the pixels nor the touch grid but you get the idea: if you stack two grids with different intersection angles, interference artefacts appear. This looks exactly like the "fabric" or mesh pattern that repeats all over my screen. You can see that it is at a much higher scale than subpixels. And we can decrease brightness, it won't go away.
So we have a high end laptop with a wonderful OLED panel, but for some obscure reason someone decided to slap a touch layer on top (that BTW hardly no one really needs, this is a laptop not a tablet) with an incompatible grid orientation that creates ugly artefacts and makes the above mentioned wonderful OLED panel worthless.
So this is a either a design defect or a poor choice of OLED/touch screen combination together with a severe lack of QA (at least on one production series of this screen). I guess some people just got the chance to get a touch layer from another series that doesn't create this issue.