Method and apparatus for operating an electrophoretic display be

Details Method and apparatus for operating an electrophoretic display be Method and apparatus for operating an electrophoretic display be

1986-07-14

1988-05-24

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 350362, G09G 300

Patent

active

047469170

ABSTRACT:
There is shown a method and apparatus for operating an electrophoretic display. The display is operated in a first mode where essentially it operates as a display having normal DC voltages applied to its electrodes. During a non-display mode, a suitable alternating voltage of a given frequency and magnitude is AC coupled to the anode electrode of the display for a predetermined time interval to cause pigment particles to settle between the anode and cathode whereby the effective life of said display is increased. The transfer of the display mode to the second mode is afforded by suitable switching circuitry.

REFERENCES:
patent: 3655267 (1972-04-01), Forlini
patent: 4041481 (1977-08-01), Sato
patent: 4187160 (1980-02-01), Zimmermann
patent: 4525710 (1985-06-01), Hoshi et al.

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