Methods for driving electrophoretic displays using dielectrophoretic forces
AssigneeE Ink Corporation
InventorsKarl Amundson, Alexi Arango, Joseph Jacobson, Thomas Whitesides, Michael McCreary, Richard Paolini
Life of this patent
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Abstract
A dielectrophoretic display has a substrate having walls defining a cavity, the cavity having a viewing surface and a side wall inclined to the viewing surface. A fluid is contained within the cavity; and a plurality of particles are present in the fluid. There is applied to the substrate an electric field effective to cause dielectrophoretic movement of the particles so that the particles occupy only a minor proportion of the viewing surface.
Claims29
A method for operating a dielectrophoretic display, the method comprising:
- providing a substrate having walls defining at least one cavity, the cavity having a viewing surface;
- a fluid contained within the cavity;
- and a plurality of at least one type of particle within the fluid;
- and
- applying to the substrate an electric field effective to cause dielectrophoretic movement of the particles so that the particles occupy only a minor proportion of the viewing surface.
A method for operating a dielectrophoretic display, the method comprising:
- providing a dielectrophoretic medium comprising a fluid and a plurality of at least one type of particle within the fluid;
- applying to the medium an electric field having a first frequency, thereby causing the particles to undergo electrophoretic motion and producing a first optical state;
- and
- applying to the medium an electric field having a second frequency higher than the first frequency, thereby causing the particles to undergo dielectrophoretic motion and producing a second optical state different from the first optical state.
A method for operating a dielectrophoretic display, the method comprising:
- providing a dielectrophoretic medium comprising a fluid and a plurality of at least one type of particle within the fluid;
- applying to the medium an electric field having a high amplitude, low frequency component and a low amplitude high frequency component, thereby causing the particles to undergo electrophoretic motion and producing a first optical state;
- and
- applying to the medium an electric field having a low amplitude low frequency component and a high amplitude high frequency component, thereby causing the particles to undergo dielectrophoretic motion and producing a second optical state different from the first optical state.
Dependencies are inferred from the claim text.