Electrophoretic media and processes for the production thereof
First Claim
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1. An active matrix electro-optic display comprising:
- a layer of electro-optic medium, the electro-optic medium comprising a plurality of charged particles disposed in a liquid and capable of moving therethrough on application of an electric field to the electro-optic medium; and
a plurality of pixel electrodes disposed adjacent the layer of electro-optic medium and arranged to apply an electric field thereto,the electro-optic medium exhibiting a voltage threshold and the charged particles having polymeric shells having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid.
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Abstract
A first electrophoretic medium comprises an electrically charged particle suspended in a suspending fluid, the particle having a polymeric shell having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid. A second, similar electrophoretic medium comprises a suspending fluid, and first and second types of electrically charged particle suspended in the suspending fluid, the two types of particle having differing optical characteristics but both having polymeric shells. The polymeric shells are arranged such that homoaggregation of the two types of particles is thermodynamically favored over heteroaggregation.
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Citations
20 Claims
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1. An active matrix electro-optic display comprising:
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a layer of electro-optic medium, the electro-optic medium comprising a plurality of charged particles disposed in a liquid and capable of moving therethrough on application of an electric field to the electro-optic medium; and a plurality of pixel electrodes disposed adjacent the layer of electro-optic medium and arranged to apply an electric field thereto, the electro-optic medium exhibiting a voltage threshold and the charged particles having polymeric shells having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active matrix electro-optic display comprising:
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a layer of electro-optic medium, the electro-optic medium comprising a plurality of charged particles disposed in a liquid and capable of moving therethrough on application of an electric field to the electro-optic medium; and a plurality of pixel electrodes disposed adjacent the layer of electro-optic medium and arranged to apply an electric field thereto, the electro-optic medium exhibiting a voltage threshold and the charged particles having polymeric shells having repeating units derived from at least one monomer the homopolymer of which is incompatible with the suspending fluid, the electro-optic medium further comprising a second type of electrically charged particle having at least one optical characteristic differing from that of the other electrically charged particle, the second type of electrically charged particle having a polymeric shell. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An active matrix electro-optic display comprising:
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a layer of electro-optic medium, the electro-optic medium comprising a plurality of charged particles disposed in a fluid and capable of moving therethrough on application of an electric field to the electro-optic medium; and a plurality of pixel electrodes disposed adjacent the layer of electro-optic medium and arranged to apply an electric field thereto, wherein the electro-optic medium exhibits a voltage threshold and comprises; a first type of electrically charged particle disposed in the fluid, the first type of particle having a first optical characteristic and a polymeric shell; and a second type of electrically charged particle disposed in the fluid, the second type of particle having a second optical characteristic differing from the first optical characteristic, and a polymeric shell; wherein the polymeric shells are arranged such that homoaggregation of the first and second types of particles is thermodynamically favored over heteroaggregation. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification