Ari Grobman (Lumus) at approx 19.36 minutes discusses pros and con, LCOS vs OLED. Lumus told Scoble in Scoble's Facebook Interview that "We could be using OLED now".SPOILER ALERT...SWAP rules the roost and High Brightness and Contrast are an absolute necessity.

If you've the time it's pretty darn interesting. Lumus' founder patented Reflective Waveguide for High Off-Boresight Targeting that's in the today advanced Helmets. The same LOE design is in Flex's Reference Design.

https://www.thearshow.com/podcast/011-ari-grobman