Electrophoretic display device
AssigneeThomson-CSF
InventorsYvan Raverdy, Jean Luc Ploix
Life of this patent
Estimating the term…
Abstract
An information display device utilizing the phenomenon of electrophoresis. It comprises two transparent electrodes parallel to one another and assembled in order to constitute a sealed cell filled with a colored fluid, and a thin porous diaphragm scattering the light in a color differing from that of the fluid, the diaphragm being arranged in the vessel parallel to the electrodes. The diaphragm displaces by electrophoresis, from one electrode to the other, under the action of potential differences applied to the electrodes.
Claims14
A display device using electrophoresis, comprising two substrates, a front substrate disposed towards incident light and a back substrate, said substrates carrying electrodes, at least said front substrate and its electrodes being transparent, said substrates being substantially parallel and attached together in order to form a closed vessel filled with a resistive fluid;
- said display device further comprising a thin electrophoretically displaceable diaphragm arranged in said vessel and permeable to said fluid, said diaphragm being capable of scattering the incident light in a colour differing from that of said fluid;
- means for applying a potential difference between at least one electrode on said front substrate and at least one electrode on said back substrate, thus developing an electric field between said substrates thereby making at least part of the diaphragm to apply on one of the two substrates in accordance with the direction of said electric field, said incident light being scattered when said diaphragm is applied on said front substrate, and being substantially absorbed by said fluid when said diaphragm is applied on said back substrate.
Dependencies are inferred from the claim text.