Electrophoretic display panel and associated methods providing single pixel erase capability
First Claim
1. In a tetrode-type electrophoretic display of the type having a plurality of parallel cathode lines arranged in a given direction, a plurality of parallel grid lines insulated by first insulator strips from said cathode lines and perpendicular thereto to form an X-Y addressing matrix, a plurality of local anode lines deposited upon said grid lines and insulated therefrom by second insulator strips, a remote anode separated from said local anode lines with space therebetween accommodating an electrophoretic dispersion including pigment particles suspended in a fluid and an electrically conductive screen allowing said pigment particles to pass therethrough, the improvement comprising:
- each of said local anode lines being disposed perpendicular to said grid lines, said local anode lines having at least two tines with spaces therebetween for at least a portion of the length of said local anode lines.
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Accused Products
Abstract
A tetrode type electrophoretic display includes local anode lines disposed perpendicular to the grid lines and having a tined configuration. In operation, the local anode may be used to write and erase selected independent pixels by applying appropriate voltages to the various electrodes of the display in the proper sequence. The tetrode employed preferably includes an intermediate mesh to permit maintaining displayed images after power removal.
238 Citations
13 Claims
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1. In a tetrode-type electrophoretic display of the type having a plurality of parallel cathode lines arranged in a given direction, a plurality of parallel grid lines insulated by first insulator strips from said cathode lines and perpendicular thereto to form an X-Y addressing matrix, a plurality of local anode lines deposited upon said grid lines and insulated therefrom by second insulator strips, a remote anode separated from said local anode lines with space therebetween accommodating an electrophoretic dispersion including pigment particles suspended in a fluid and an electrically conductive screen allowing said pigment particles to pass therethrough, the improvement comprising:
each of said local anode lines being disposed perpendicular to said grid lines, said local anode lines having at least two tines with spaces therebetween for at least a portion of the length of said local anode lines. - View Dependent Claims (2, 3, 4)
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5. A method for operating a tetrode-type electrophoretic display of the type having a plurality of parallel cathode lines arranged in a given direction, a plurality of parallel grid lines insulated from said cathode lines and perpendicular thereto to form an X-Y addressing matrix, a plurality of local anode lines deposited upon said grid lines perpendicular thereto and insulated therefrom by insulator strips, a remote anode separated from said local anode lines with space therebetween accommodating an electrophoretic dispersion including pigment particles suspended in a fluid and an electrically conductive screen allowing said pigment particles to pass therethrough, includes the steps of:
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electrically connecting said cathode lines, said grid lines, said screen, said local anode lines and said remote anode to a source of electrical potential energy, said source simultaneously providing a selected set of independent voltages to each of said cathode lines, said grid lines, said screen, said local anode lines and said remote anode under the control of control means for controlling said independent voltages supplied by said source; and selectively erasing single pixels previously written on said display by controlling said source of electrical potential energy with said control means such that voltage levels are applied to said cathode lines, said grid lines, said screen, said local anode lines and said remote anode. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification