AR optical combiners are the flat, transparent optics that route a microdisplay’s light into the eye while passing through the real world; the supplied source set contains no work on them, so no assessment of their maturity can be earned here.
Summary
In a head-worn augmented reality display, the combiner is the element that sits in front of the eye and performs one job: superimpose an image generated by a light engine onto the user’s view of the real world. A waveguide combiner does this by coupling light from the projector into a thin, flat slab of glass or plastic, trapping it by total internal reflection, transporting it laterally to a position in front of the pupil, and then coupling it out towards the eye. The in-coupling and out-coupling structures are typically diffraction gratings (surface-relief or volume-holographic), reflective facet arrays, or metasurfaces. The out-coupler is usually designed to leak light gradually across an extended area so that the exit pupil is larger than the projector aperture, which is what allows the eye to move without the image vanishing.
The honest conclusion is that this page cannot be scored from the evidence supplied. What follows states that explicitly rather than manufacturing a defensible-looking number.
Evidence base
Open questions
Assessment drafted 2026-08-31 from up to 18 KB sources using the technology-scorecard framework; scores are a draft read pending review.