Electrophoretic medium and display with improved image stability
First Claim
1. An electrophoretic medium comprising a fluid and a plurality of electrically charged particles disposed in the fluid and capable of moving therethrough on application of an electrical field to the medium, each of the charged particles having a polymer coating comprising at least one first group, the medium further comprising a polymer dispersed in the fluid, the polymer in the fluid having a plurality of second groups capable of attracting the first groups on the particles so that the polymer in the fluid forms a complex with the electrophoretic particles, wherein one of the polymer coating and the polymer in the fluid comprises a hydrogen bond donor and the other comprises a hydrogen bond acceptor.
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Accused Products
Abstract
An electrophoretic medium comprises a fluid and a plurality of electrically charged particles disposed in the fluid and capable of moving therethrough on application of an electrical field to the medium. Each of the charged particles has a polymer coating comprising a first group. A polymer is dispersed in the fluid, this polymer having a plurality of second groups capable of attracting the first groups on the particles so that the polymer in the fluid forms a complex with the electrophoretic particles.
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Citations
13 Claims
- 1. An electrophoretic medium comprising a fluid and a plurality of electrically charged particles disposed in the fluid and capable of moving therethrough on application of an electrical field to the medium, each of the charged particles having a polymer coating comprising at least one first group, the medium further comprising a polymer dispersed in the fluid, the polymer in the fluid having a plurality of second groups capable of attracting the first groups on the particles so that the polymer in the fluid forms a complex with the electrophoretic particles, wherein one of the polymer coating and the polymer in the fluid comprises a hydrogen bond donor and the other comprises a hydrogen bond acceptor.
Specification