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Originally Posted by Sil_liS
So they could use this for posters or brochures but not for readers?
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To switch between white and black requires an applied electric field. That's what the backplane does.
The electric fields are applied by having electrodes controlled by the display controller electronics. These electrodes can be large fixed areas (like in the video you linked to), or they can be small square dots in a grid (like the 600x800 grid in most 6" eInk screens).
It's possible to use either with either plastic, foil or glass substrate, but glass substrates are easier for the pixel grids, because they're not so liable to deformation.
Several companies are working on making eInk displays without glass substrates Hopefully they'll find a economical way to make them in volume, and ereader screens will become more robust.