Method and apparatus for operating an electrophoretic indicating element
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United States of America Patent
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Feb 5, 1980
Grant Date -
N/A
app pub date -
Jul 18, 1978
filing date -
Nov 11, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for operating an electrophoretic indicating element driven by a drive signal, wherein the drive signal is modulated by an alternating voltage signal superimposed on the drive signal and having a frequency sufficiently high to prevent observation thereof. The modulating signal can have either a sinusoidal, triangular, or rectangular wave shape, or can be a succession of individual wave trains wherein the duration of each wave train is selected in accordance with the composition of the electrophoretic switching element.
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