There are some screen types with variations on the geometry, like some sub-pixels shared between logical pixels. E.g. Samsung's diamond pixel https://global.sa

There are some screen types with variations on the geometry, like some sub-pixels shared between logical pixels. E.g. Samsung's diamond pixel https://global.samsungdisplay.com/29043/ https://global.samsungdisplay.com/29043/, Apple watch https://imgur.com/GkKjjwy https://imgur.com/GkKjjwy. They are still programmed as squares, but the light isn't emitted exactly like that (still coming from discrete areas, not points). See also https://www.reddit.com/r/apple/comments/9fp1ty/did_you_ever_looked_at_apple_screens_under_a/ https://www.reddit.com/r/apple/comments/9fp1ty/did_you_ever_....