This might be slightly out of place to post this here but I just watched a lecture on this. It's an improvement on current binary interferometric display (mirasol) with single-pixel generation of every color in the RGB space:
http://www.freepatentsonline.com/y2010/0315696.html
Requires more control circuitry and likely more power, but it's still orders of magnitude lower than active displays.
http://www.freepatentsonline.com/y2010/0315696.html
Requires more control circuitry and likely more power, but it's still orders of magnitude lower than active displays.