Our next teardown is the Rokid Max AR Glasses, despite chronologically being one of the earlier display glasses on the market. It’s likely fair to say a few of the brands we’ve already looked at (aka Viture…) took heavy inspiration from this initial design. This is most apparent with the diopter adjustment mechanism, as well as the removal of 1x QWP from each optical module (see diagram below).
A downside of being first to market is that you can’t get everything right all the time – this was definitely the case with these glasses, especially when it comes to the thermal management solution for the display. There is no heatsink directly in contact with the display, and the minimal amount of thermal tape on the back of the Sony panel won’t effectively do much to remove the heat away from the panel…
Display-wise, Rokid is using the same Sony panels (specifically the 0.68″ ECX343E panels) that Xreal and Viture use, which leads to a much smaller color space possible than with the Rayneo panels. You can see the spectrum in blue below and how much more overlap there is between blue (~460nm) and green (~540nm) peaks in these Sony panels.
When we break this down into individual blue, green and red spectra measurements, it’s even more apparent that the Sony panels are performing worse than the SeeYA panels from a color purity perspective – the full-width, half-maxes of each of the primary colors in the Rokid Max (left) are all much higher than their equivalents in the SeeYA panel in the RayNeo unit (right), but the worst is green. In this wavelength range, the Sony panel had an 80nm (!) FWHM compared to just 31nm for SeeYa…
From an optics perspective, it’s more fair to say that Rokid was the one to originally reduce the manufacturing cost by only using one QWP on the half mirror lens, not Viture. I’ve updated the polarization diagram below with the changes in film location marked in bold, but this also doesn’t show that the QWP that was removed between locations (2) and (3), as well as (4) and (5).
Display Training Center 
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