“After making the video, I met with Lumus and discussed their efficiency with MicroLEDs. At 07:05 in the video on WaveGuide Efficiency Problems, I was broadly discussing waveguides but primarily considered diffractive waveguides. Lumus pointed out to me that their light entrance area with a Lumus-type reflective waveguide is much larger and thus would have fundamental efficiency (etendue) advantage of several times and perhaps 10x. Lumus did not say whether or not they are working on a MicroLED-based engine to go with their waveguides. Lumus is currently making waveguides that output thousands of nits to the eye using LCOS microdisplays.”
Click here for the entire Guttag Blog Post. (Scroll down just after sectio on Porotech).