Many people have wished for an A4 display rolling out from a pocket device. As electronics shrink, the screen will be the limiting factor. Can anyone envision a screen that folds in two directions without wrinkling? Then once we unfold it (e.g. 2"x3" unfolds to 8"x10") does it have fold marks? There are probably materials that will accommodate folding in two directions, but can we make screens out of them? Then we have the problem of how to hold the flexscreen flat while it is unfurled. It is enough to give a mechanical engineer bad dreams.
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PicoP projector is a small laser projector that can fit in a pocket device like a cell phone or, uh, a reader. It would project a perfectly focused screen image onto many different surfaces at a range of distances. But we have a similar problem. How do we keep the screen image from joggling about as we hold the reader?
I can envision a projector mounted on the headboard of the bed and projecting onto the ceiling. But the projector must be fixed. Maybe the reader is a device that looks like a pocket-sized game console and has a wireless connection to the projector. Maybe it has a small screen for reading when the projector is not available or when it is not practical to use a projection surface from which to read.
My masculine intuition tells me that when somebody markets a reader with a larger screen it will not be a flexscreen. It will either be fixed in size or contain a projector. The flexscreen will be limited to unfurling in one dimension and so will be limited in height or width to pocket size.
A really good solution to the big screen problem would capture some of my money.