I'm not sure how to properly interpret "4.5um pixel size" within the context of a non-square module. The pixel dimensions (square? slightly rectangular?) aren't in the PDF. I'm also not sure how to compute how many 4.5um pixels there are within 1 sq mm, which I would very much like to do.
Wow, I was really distracted when I wrote the above. Specifically
> ...which I think means a single row or column has approximately 222 pixels in it.
No no. This was supposed to say that, at 4.5um, 1 millimeter of space has 222 pixels in it per row/column! (So given any 4.5um column, a 1mm width/height span will have 222 pixels in it.)
Taking a look at Step 9 (https://www.ifixit.com/Teardown/Magic+Leap+One+Teardown/1122...) where the LCOS display is revealed, I took a look at the linked PDF.
That PDF says the pixel size is 4.5um. 1000/4.5 is 222, which I think means a single row or column has approximately 222 pixels in it.
I ran the display through https://www.sven.de/dpi/ (specifying a display size of 0.4 inches), and it decided the display has 5507.27 PPI.
The PDF says that the active area is 8.64mm x 4.86mm, so that PPI rating isn't perfectly accurate - but _wow_, 1080p in less than 1cm x 0.5cm. Ha.
The LCOS module is shown 2nd from right in Step 15. https://www.ifixit.com/Teardown/Magic+Leap+One+Teardown/1122...
I'm not sure how to properly interpret "4.5um pixel size" within the context of a non-square module. The pixel dimensions (square? slightly rectangular?) aren't in the PDF. I'm also not sure how to compute how many 4.5um pixels there are within 1 sq mm, which I would very much like to do.