Electrode structure for an electrophoretic display apparatus
AssigneeCopytele, Inc.
InventorsFrank J. DiSanto, Denis A. Krusos
Life of this patent
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Abstract
Anode electrode structure (12) for a display such as an electrophoretic display panel. An anode electrode structure (12) which is fabricated in accordance with the present invention includes a multiplicity of anode line segments (2), (7), (13) and (18) wherein each anode line segment comprises at least a first and a second conductor. An embodiment of the inventive anode electrode structure (12) enables a selective erase operation of a line (8) in a display without partial erasure of adjacent lines (3), (14), (19).
Claims20
In an electrophoretic display having a fluid-tight envelope having a portion thereof which is at least partially transparent, an electrophoretic fluid contained within said envelope, said fluid having pigment particles suspended therein, and a cathode and grid electrode structure having a plurality of cathode and grid conductors passing through said envelope and said fluid, the improvement in combination therewith comprising:
- an anode electric having a plurality of elongated parallel anode conductors passing through said envelope and said fluid and arranged in a multiplicity of groups of at least two conductors, one of the at least two conductors of each group of conductors being larger than another of each group of conductors.
An electrophoretic display, comprising:
- a fluid tight housing having a portion thereof which is at least partially transparent, an electrophoretic fluid contained within said housing, said fluid having pigment particles suspended therein, and a cathode and grid electrode structure having a plurality of cathode and grid conductors passing through said housing and said fluid, an anode electrode located within said housing and having a first plurality of parallel character lines each separated one from the other by a predetermined distance and forming a grid of anode lines each line of a given length and width;
- and
- a second plurality of conductive control lines each also positioned between an associated first and second character line and each of relatively the same length as said associated character lines but of a lesser width, with at least one of said first plurality of character lines adapted to receive a different operating potential than said second plurality of control lines during at least one operating mode of said display.
A method of selectively erasing an electrophoretic display, comprising the steps of:
- positioning a conductive control line beneath an anode character line in a display;
- applying a voltage of a given polarity to said control line when an erase voltage of the opposite polarity is applied to said character line;
- and
- applying said given voltage to all other character lines not being erased.
Dependencies are inferred from the claim text.