Would a reliable sharply-folding screen be easier to make than perhaps a "roll-up", scroll-type display? I remember a science fiction TV show from a few years back where the screen apparently rolled out of a control unit; you pulled the screen out to view it, otherwise it was rolled up and protected within its control-box. This required that the entire screen be flexible, but did not require it to fold up like pages in a magazine. With the curved TV screens that are now becoming available, perhaps this sort of "roller blind" display is not that far off.