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US 4,522,472 AGranted
Electrophoretic image display with reduced drives and leads
AssigneeNorth American Philips Corporation
InventorsRichard B. Liebert, Roger P. White
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Abstract
An electrophoretic display device is described where a set of anode electrodes in an electrophoretic cell are disposed opposite row and column electrodes at a second side of the electrophoretic cell. The anode electrodes encompass equal pluralities of at least the row electrodes, and such equal pluralities of electrodes are connected in parallel. This significantly reduces the number of leads to the display.
Claims14
An electrophoretic display device comprising first and second oppositely disposed substrates with at least one of said substrates being transparent,
- a plurality of first electrodes disposed at a facing surface of said first substrate,
- a plurality of second electrodes disposed on a dielectric structure adjacent to said first electrodes,
- means for connecting equal numbers of at least said first electrodes in parallel,
- an electrophoretic fluid containing a plurality of charged pigment particles disposed between said first and second substrates,
- a plurality of third electrodes disposed on a facing surface of said second substrate, each of said plurality of third electrodes being opposite to a number of said plurality of first and second electrodes, and
- means for alternatively applying an enabling voltage bias value on one of said third electrodes and means for maintaining a lower voltage bias value on remaining ones of said third electrodes.
3 more elements
Dependencies are inferred from the claim text.