Electrophoretic display device and method for driving the same
AssigneeCanon Kabushiki Kaisha
InventorNobutaka Ukigaya
Life of this patent
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Abstract
An electrophoretic display device includes a pair of substrates arranged with a predetermined gap maintained therebetween, a dispersing fluid disposed between the pair of substrates, a plurality of charged particles mixed in the dispersing fluid, at least a pair of display electrodes arranged on one of the substrates and defining a pixel, and a guard electrode arranged in a border between adjacent pixels. The guard electrode limits the movement of the charged particles to within a single pixel when the guard electrode is biased at a potential higher than (lower than) each of the display electrodes of the two adjacent pixels with the border arranged therebetween if the particles are positively (negatively) charged.
Claims18
An electrophoretic display device for presenting an image by moving charged particles between a pair of display electrodes across which a voltage is applied, said electrophoretic display device comprising:
- a pair of substrates arranged with a predetermined gap maintained therebetween;
- a dispersing fluid disposed between said pair of substrates;
- a plurality of charged particles mixed in the dispersing fluid;
- at least a pair of display electrodes arranged on one of the substrates and defining a pixel;
- and
- a guard electrode arranged at a border between two adjacent pixels,
- wherein said guard electrode limits the movement of said charged particles to within a single pixel and,
- (1) wherein said guard electrode is set at a potential higher than each of said display electrodes of two adjacent pixels with the border therebetween if said particles are positively charged, or
- (2) wherein said guard electrode is set at a potential lower than each of said display electrodes of two adjacent pixels with the border if said particles are negatively charged.
A method of driving an electrophoretic display device for presenting an image by moving charged particles between a pair of display electrodes across which a voltage is applied, the electrophoretic display device comprising a pair of substrates arranged with a predetermined gap maintained therebetween, a dispersing fluid disposed between said pair of substrates, a plurality of charged particles mixed in the dispersing fluid, at least a pair of display electrodes arranged on one of the substrates and defining a pixel, and a guard electrode arranged in a border between two adjacent pixels, said method comprising the steps of:
- limiting the movement of the charged particles to within a single pixel by (1) biasing the guard electrode at a potential higher than each of the display electrodes of the two adjacent pixels with the border therebetween if the particles are positively charged, or (2) biasing the guard electrode at a potential lower than each of the display electrodes of the two adjacent pixels with the border therebetween if the particles are negatively charged.
An electrophoretic display device for presenting an image by moving charged particles between a pair of display electrodes across which a voltage is applied, said electrophoretic display device comprising:
- a pair of substrates arranged with a predetermined gap maintained therebetween;
- a dispersing fluid disposed between said pair of substrates;
- a plurality of charged particles mixed in the dispersing fluid;
- at least a pair of display electrodes arranged on one of the substrates and defining a pixel;
- and
- guard electrodes means, arranged at a border between two adjacent pixels, for limiting movement of the charged particles to within a single pixel, wherein said guard electrodes means is set at a potential higher than each of said display electrodes of two adjacent pixels with the border therebetween when said particles are positively charged.
An electrophoretic display device for presenting an image by moving charged particles between a pair of display electrodes across which a voltage is applied, said electrophoretic display device comprising:
- a pair of substrates arranged with a predetermined gap maintained therebetween;
- a dispersing fluid disposed between said pair of substrates;
- a plurality of charged particles mixed in the dispersing fluid;
- at least a pair of display electrodes arranged on one of the substrates and defining a pixel;
- and
- guard electrodes means, arranged at a border between two adjacent pixels, for limiting movement of the charged particles to within a single pixel, wherein said guard electrode means is set at a potential lower than each of said display electrodes of two adjacent pixels with the border when said particles are negatively charged.
Dependencies are inferred from the claim text.