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Just a question like that.
Eink is composed of tiny particles floating in a liquid. Is it possible that this liquid can leak or that it could slowly permeate through the retaining membrane? If so, logically the missing fluid would create a resistance for the grids that would prevent the particles from turning completely vertical ie. giving a grey tone instead of black.
An other idea is that the capacitor or whatever component giving the charge to the grids, is deteriorating and preventing a proper discharge.
Note that I have only basic knowledge of electronics. Is there someone here that could explain the working properties of eink displays? Also I would like to know how greytones are achieved .
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