from
http://www.freshpatents.com/Electrop...0050000813.php
Quote:
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However, the electro-optical properties of encapsulated electrophoretic displays could still be improved. Among the remaining problems of encapsulated electrophoretic displays are so-called "rapid white state degradation", a relatively rapid decline in the reflectivity of the white optical state of the display during the first few days of operation. Another problem, which is discussed in detail in the aforementioned 2003/0137521 and WO 03/107315, is so-called "dwell state dependency", which causes the change in optical state of an electrophoretic medium produced by a specific waveform to vary depending upon the time for which the electrophoretic medium has been in a particular optical state before the waveform is applied. Finally, it is advisable to make the white optical state of the display whiter and the black optical state darker.
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So maybe we just went through the "rapid white state degradation"? Hmmm....