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US 2006/0222976 A1Published application
Particles for electrophoretic media
AssigneeXerox Corporation
InventorsSan-Ming Yang, Naveen Chopra, Man-Chung Tam, Peter Kazmaier, Gabriel Iftime
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Abstract
Compositions of encapsulated triboelectrically charged particles and methods for making them using a spinning disc process are disclosed. The methods can be used to make charged pigment particles embedded in a neutral polymer matrix. The polymer matrix keeps oppositely charged pigment particle from agglomerating. The particles can be used for electrophoretic displays.
Claims20
A composition comprising:
- one or more triboelectrically charged pigment particles dispersed in a polymer matrix.
A method comprising:
- charging pigment particles in a melted polymer matrix by movement of the pigment particles and polymer matrix across a substrate;
- and
- cooling droplets released from the substrate to form electrophoretic particles with charged pigment particles dispersed in the polymer matrix.
An electrophoretic display comprising:
- a cell having two opposed conductive plates separated from each other by an insulator to form a sealed cavity between the plates;
- each plate having one or more electrodes and where at least one of the plates and the one or more electrodes are transparent;
- wherein the cavity includes a suspension of an inert dielectric fluid mixed with electrophoretic particles;
- wherein the electrophoretic particles are nearly neutrally buoyant in the dielectric fluid and include triboelectrically charged pigment particles dispersed in a polymeric matrix;
- and;
- wherein the electrophoretic particles move in response to an electric field applied to the electrodes.
3 more elements
Dependencies are inferred from the claim text.