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The “hype” has been replaced with a gradual iterative evolution. On one side, we see virtual reality (VR) headsets migrating into the VR/VPT (video pass-through) headsets. VPT is more in the realm of VR, but enables limited interaction with reality (a tenet of the AR promise). Set for release in 2023, these VR/VPT headsets are primarily for indoor use. So, when you do not have to battle the largest light bulb in the universe (the sun), most of these VR/VPT headsets tend to use microOLED displays.

Migrating into full AR glasses with all-day wear means the display will require a high dynamic range to work equally well in dimly lit indoor spaces, as well as mid-day sun outdoor spaces.

MicroOLEDs simply do not have the power (measured in nits) to compete against the sun in outdoor applications. So, AR glasses require a different light source with contenders including conventional LEDs, microLEDs, and edge-emitting lasers with vertical cavity surface-emitting lasers (VCSELs) being potential future sources.

All of these light sources come with their different attributes:

Conventional LEDs are a mature technology and relatively cheap. However, they are also a Lambertian emitter (multidirectional light beams) and have an etendue topic that must be addressed if the AR glasses are to be small and stylish.