Method and apparatus for operating an electrophoretic indicating

Details Method and apparatus for operating an electrophoretic indicating Method and apparatus for operating an electrophoretic indicating

1978-07-18

1980-02-05

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204299R, 204299EC, 340787, 355 5, 350355, 430 35, C25D 1318, G02F 140

Patent

active

041871600

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.

REFERENCES:
patent: 3674475 (1972-07-01), Silverberg
patent: 3756693 (1973-09-01), Ota
patent: 4045327 (1977-08-01), Noma et al.
patent: 4062009 (1977-12-01), Raverdy et al.
patent: 4071430 (1978-01-01), Liebert

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