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@yvan, good observations on the issues with rolling materials. This got me thinking about how to address at least the squaring and curvature issues. What if there were "rails" that rolled out at the same time as the screen, but the rails were coiled perpendicular to the curve of the screen?
Imagine you have the unit in your left hand, as shown in the illustration. At the top and bottom of the screen are "rails" which are more rigid than the screen itself. But the rails also roll up -- they are less rigid in one direction.
Now imagine that the screen is rolled up. The screen curvature is defined as "down." But the rails roll up "sideways". Their curvature is different from that of the screen, so the curvatures balance out when the screen is unrolled.
Can you picture what I mean?
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