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All the current Visplex devices are using the old 4-level controller. E Ink has announced a new controller that will support 8 grey levels (and bigger screens, i.e. more pixels). So the delay in larger Visplex screens may be partially controller related.
As I understand it, the iLiad screen is E Ink but the controller is from iRex and that is why it has been the only one supporting a larger screen and 16 grey levels. However, I have not seen a clear explanation of where the iLiad screen comes from (perhaps there was one before I started monitoring the iLiad threads).
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