They claim their method results in 99.4% absorption (even though theoretical number is higher). This does not look too hard for visible range. (But maybe for other frequencies, I don't know.)
A typical HDTV with a contrast ratio better than 167:1 is already doing this using liquid crystal (uses polarization rather than a black object).
A typical HDTV with a contrast ratio better than 167:1 is already doing this using liquid crystal (uses polarization rather than a black object).