The screen doesn't actually work.
I spent a few minutes this morning in the Qualcomm booth, eager to play with their new prototype, but unfortunately it is more of a prop than a prototype. The display is completely non functional, and it would perhaps be better to describe it as a custom print job than a display. Qualcomm used manufacturing tech similar to what is used to make a Mirasol screen and printed the prototype that everyone is talking about.
If the stats are to be believed then this could one day be a super high resolution smartphone screen with a resolution of 2560x1440, or about 564 ppi. But at the moment it is simply a printed screen that has a lower resolution than my $150 inkjet printer.
The Qualcomm reps tried to sell me the same "it's under development" line that they convinced everyone else to believe, but I don't buy it. The thing is, if nonfunctional props count as demos then Star Trek had the first tablets, cell phones, and so on. Show me a demo that works and I will call it a demo. Until then it's a movie prop, no more and no less.
And given the difficulty that Qualcomm has faced with this screen tech, I don't expect this screen to ever hit the market. I expect it to suffer the same fate as the 4.3" smartphone demo units that Qualcomm showed off last year.