Methods for driving electrophoretic display so as to avoid...

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

Reexamination Certificate

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C345S055000

Reexamination Certificate

active

07952558

ABSTRACT:
Certain types of displays such as electrophoretic displays tend to deteriorate if their pixel units are persistently driven by currents flowing in only one direction for the purpose of maintaining (i.e. refreshing) a relatively constant optical state. A first method pulses the pixel unit with a drive pulse of opposed polarity but duration too short (i.e. less than 1/25 second) for a viewer to notice. A second method pulses the pixel unit with a drive pulse of opposed polarity but magnitude to small to effect change in optical state.

REFERENCES:
patent: 2005/0122284 (2005-06-01), Gates et al.
patent: 2005/0179642 (2005-08-01), Wilcox et al.
patent: 2006/0139308 (2006-06-01), Jacobson et al.
patent: 2007/0200795 (2007-08-01), Whitesides et al.
patent: 2010/0149169 (2010-06-01), Miyasaka

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