While trying to sleep, I begun wondering, if - indeed - the Astro screen, in landscape mode, has a 2340 sets of RGB triplets horizontally, but "only" 720 of them vertically, wouldn't it then be possible to nicely depict a simple pattern consisting of every second pixel horizontally and every third pixel vertically? In theory, depending on the mapping algorithm, every second physical RGB triplet vertically should line up with every third logical pixel.
So, I drew this and took pictures.
That looks like a clean match to me. We're looking at the screen lighting up every second RGB triplet, both horizontally and vertically. If in any doubt, we could try to take exactly the same image with an off-black background, to see the in-between triplets. As that's beyond what I can reproduce, here I have digitally superimposed an approximation of how it would look like.
It should be evident that the black gaps are one triplet, both ways.
There should only be a 1/3 chance for things to line up this neatly vertically. In the other two cases, the logical pixels would be 2/3 of a physical RGB triplet off vertically, in which case this, too, should be blurry, depending on how, in particular, the mapping algorithm works.
One slightly weird thing I noticed, was that I could only get a "clean" match,
while dragging the image around (which made getting a good photo of it even harder, with one hand of the camera and one on the phone) inside the image editor (Photo Editor by dev.macgyver) I was using to show the image at 100% (since it turned out that the regular Android photo album didn't show my test picture at
exactly 100% on my Astro).
As soon as I let go of the image, it would settle in a slightly blurred state every time. I can't know for sure whether this is a behaviour in that app or not, but the app shouldn't (need to) know what type of display the device has, so my best guess is that the display driver tries to even things out by always making the image a tad blurry "at rest". Perhaps this is a tad too CPU intense to do while something is being dragged around, but well, now I'm just guessing, so I think it's time to declare this little foray into the physical screen layout done.
We seem to have 2340 x 720 x 3 = 5054400 individual OLED segments on our Astro displays. I wish they were 2340 x 1080 x 3 = 7581600, but perhaps it isn't yet feasible to do at 400+ DPI at a reasonable cost? My laptop, that has a triplet per pixel "only" needs to do that at around 320 DPI, and even it has some funky offset business going on with its blue segments, so maybe "clean" OLED screens, at these densities, just aren't quite here yet?
Oh, before I leave, here's the "raw" test image I've been using, in case anyone would want to peep at their own pixels.
Edit: Added the "raw" test image.