Electrophoretic display with holding electrodes
AssigneeSiPix Imaging, Inc.
InventorsJerry Chung, David Chen
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Abstract
An electrophoretic display having at least one holding electrode is disclosed. The display comprises a plurality of electrophoretic cells filled with charged particles dispersed in a dielectric solvent. Each said cell is positioned between a top electrode layer and a bottom electrode layer. The top electrode layer comprises at least one driving electrode positioned over more than one cell. The bottom electrode layer comprises at least one driving electrode positioned under more than one cell. The display further comprises a holding electrode located in the bottom electrode layer. The display may further comprise a colored background located under and visible through the bottom electrode layer.
Claims30
An electrophoretic display comprising:
- (a) a plurality of electrophoretic cells filled with charged particles dispersed in a dielectric solvent;
- each said cell being positioned between a top electrode layer and a bottom electrode layer, said top electrode layer comprising at least one driving electrode positioned over at least one cell and said bottom electrode layer comprising at least one driving electrode positioned under said at least one cell;
- and
- (b) a holding electrode located in the bottom electrode layer and positioned under said at least one cell;
- wherein the holding electrode is configured and biased such that when said at least one cell has been switched to a state in which the charged particles of said at least one cell are in a position at or near said holding electrode a holding electric field is generated to hold the charged particles in said position at or near said holding electrode during scanning of a row that does not comprise said at least one cell notwithstanding that the respective bias voltages applied to said driving electrodes would otherwise establish in said cell a driving electric field that would tend to drive the charged particles in the direction of said top electrode layer if said holding electrode were not present.
An electrophoretic display comprising:
- (a) a plurality of electrophoretic cells filled with charged particles dispersed in a dielectric solvent;
- each said cell being positioned between a top electrode layer and a bottom electrode layer, said top electrode layer comprising at least one driving electrode positioned over at least one cell and said bottom electrode layer comprising at least one driving electrode positioned under said at least one cell;
- (b) a holding electrode located in the bottom electrode layer and positioned under said at least one cell;
- and
- (c) a colored background layer located under and visible through the bottom electrode layer;
- wherein the holding electrode is configured and biased such that when said at least one cell has been switched to a state in which the charged particles of said at least one cell are in a position at or near said holding electrode a holding electric field is generated to hold the charged particles in said position at or near said holding electrode during scanning of a row that does not comprise said at least one cell notwithstanding that the respective bias voltages applied to said driving electrodes would otherwise establish in said cell a driving electric field that would tend to drive the charged particles in the direction of said top electrode layer if said holding electrode were not present.
Dependencies are inferred from the claim text.