The competition is better than portrayed here:
Nomad's see-through capability and hands-free nature gives it greater functionality for mobile applications than competing wearable displays.
The Nomad display is adjustable to very bright light levels and, unlike other wearable displays, is fully daylight readable.
For example, on his Home Page is an old photo of Thad Starner wearing an Eyeglass Display from Microptical Corp., for augmented reality: "An advocate of continuous-access, everyday-use systems, Thad has worn his custom wearable computer in such a manner since 1993, arguably the longest such experience." No hat necessary, and it's truly see-through and non-occluding, with no apparatus dangling in your field of view. By using a beam-splitter / spherical mirror combination embedded within the eyeglass lens, the projected image is superimposed on the ambient scene, without blocking that portion of the field behind the optical element.
cc.gatech.edu
On the other hand, MicroOptical may not have the resources to get much beyond DARPA contracts and beta test units. Maybe they don't want to.
It certainly makes sense to use high brightness LEDs for wearable displays in general, if there's a need for higher brightness. The cost of the LEDs is a small part of the overall cost. The Eyeglass Display uses red, green and blue LEDs as the light source. I don't know who the supplier is; it's whoever Kopin uses for their CyberDisplay.
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