Electrophoretic display
First Claim
1. An electrophoretic display comprising:
- a cell having two opposed plates spaced relative to each other and at least regionally provided with electrodes of which at least the plate facing an observer and its electrode are transparent,said cell containing a suspension consisting of an inert continuous dielectric liquid phase and a dispersed solid phase constituted at least in part by optically discriminable electrophoretic particles, said individual electrophoretic particles all having practically the same density as the liquid phase, and at least part of the electrophoretic particles constituted by pigment particles coated with a sheath of organic material solidified at the cell operating temperature but melting at higher temperatures,wherein the sheath matrial contains at least one charge control agent so as to impart a well-defined and practically uniform surface charge as well as a well-defined and practically uniform surface potential to the electrophoretic particles.
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Accused Products
Abstract
An electrophoretic display including a cell having two plates spaced apart and provided at least regionally with electrodes, where at least one plate and an associated electrode facing the observer are transparent. The cell contains a suspension consisting of an inert dielectric liquid phase and a dispersed solid phase which at least in part are optically discriminable electrophoretic particles. The individual electrophoretic particles each are of practically the same density as the liquid phase, and at least part of the electrophoretic particles are pigment particles provided with a coating of organic material which is solid at the cell operating temperature but which melts at higher temperatures. The coating material contains at least one charge control agent. The charge control agent, preferably a salt of a divalent metal or metal of higher valency and of an organic acid, imparts a well-defined, uniform surface charge and a well defined, uniform surface potential to the particles.
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Citations
18 Claims
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1. An electrophoretic display comprising:
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a cell having two opposed plates spaced relative to each other and at least regionally provided with electrodes of which at least the plate facing an observer and its electrode are transparent, said cell containing a suspension consisting of an inert continuous dielectric liquid phase and a dispersed solid phase constituted at least in part by optically discriminable electrophoretic particles, said individual electrophoretic particles all having practically the same density as the liquid phase, and at least part of the electrophoretic particles constituted by pigment particles coated with a sheath of organic material solidified at the cell operating temperature but melting at higher temperatures, wherein the sheath matrial contains at least one charge control agent so as to impart a well-defined and practically uniform surface charge as well as a well-defined and practically uniform surface potential to the electrophoretic particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification