I'm in Seattle, WA for the SID 2010 conference this week. I've been pushing a human interface architecture at work (now it's "our" architecture) and a lot of features of it seem to work well using transparent and/or flexible displays.
OLED displays can be flexible, transparent, or both - seemingly perfect. Electrophoretic ink technology can be flexible; I haven't seen any transparent e-ink displays but don't see why that's not possible (in fact I expect that it is). There are quantum dot displays which are cool, but I don't think they're going to be transparent or flexible.
Anyway. So there's this display technology that's perpetually 5 years out and sure enough, at SID 2010, OLED is only really present on the 6th floor (where they're talking about what will overtake LCDs in 5 years). Meanwhile on the 4th floor at the trade show booths, it's all 3D (yawn), touch (yawn), and LCD. LCD doesn't get a yawn mainly because there are some VERY impressive LCD displays out there (NEC in particular had LCD displays that could easily be mistaken for OLED, or real life). (Aside: lots of noise about in-plane switching LCDs, which is what's on the iPad. Seen a few iPads here, not in use by people but at booths. I'm still 0% impressed with the iPad; hardware, software, concept. Sorry ...)
As in most trade shows, the people on the 4th floor frequently don't know much about what they're showing off. In this particular case, new display technologies tend to come from Japan, South Korea, or Western Europe so there are a lot of people with very thick accents around. Actually I was a bit disappointed at the lack of US representation; apparently very few US institutions are pushing display technology. By contrast, the European Union has invested heavily in display technology (among other things) the last several years, and it shows - a huge Western European contingent was there. Germany, in particular, filled a large section of floor space with a coordinated set of booths.
I have another day here, but I expect that I'll leave somewhat disappointed in the prospects. Transparent, flexible OLED displays exist in the lab, but nobody is willing to move them to commercial products for some reason. The best example I've seen so far is a Samsung laptop with a 14.1" transparent OLED display, which works a lot better than you would think. How many of them exist? Apparently just the one. Are they planning to start commercial sales of them? Maybe later. Which is what they said last year.
Playing the NASA card got at least a few of the people interested, so I may yet have work to do after this fiscal year (if NASA will support this work - they should, but that's a rant for another day).