This confuses me, many phones have 4k screens, the Apple Watch has a 330ppi which is much higher than the 5k 27” display Mac display. So basically you can almost certainly source a high enough pixel density to support 2k on AR lenses.
These displays in the glasses are significantly smaller than even your Apple Watch though (0.58" or so I believe). Essentially the displays they're using are the same ones found in DSLR viewfinders. There should be higher resolution options, but I suspect the resolution limiter is the optics not the pixel size (just a suspicion).
