METHODS FOR DRIVING ELECTROPHORETIC DISPLAYS USING DIELECTROPHORETIC FORCES
First Claim
Patent Images
1. 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;
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 applying to the medium an electric field having a third frequency higher than the second frequency, thereby causing the particles to undergo dielectrophoretic motion and producing a second optical state different from the first optical state.
1 Assignment
0 Petitions
Accused Products
Abstract
A dielectrophoretic display is shifted from a low frequency closed state to a high frequency open state via at least one, and preferably several, intermediate frequency states; the use of such multiple frequency steps reduces flicker during the transition. A second type of dielectrophoretic display has a light-transmissive electrode through which the dielectrophoretic medium can be viewed and a conductor connected to the light-transmissive electrode at several points to reduce voltage variations within the light-transmissive electrode.
167 Citations
17 Claims
-
1. 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; 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 applying to the medium an electric field having a third frequency higher than the second frequency, thereby causing the particles to undergo dielectrophoretic motion and producing a second optical state different from the first optical state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A dielectrophoretic display comprising:
-
a dielectrophoretic medium comprising a fluid and a plurality of at least one type of particle within the fluid; at least one electrode arranged to apply an electric field to the dielectrophoretic medium; and field control means for controlling the electric field applied by the at least one electrode, the field control means being arranged to apply an electric field having a first frequency, which causes the particles to undergo electrophoretic motion and producing a first optical state;
an electric field having a second frequency higher than the first frequency, which causes the particles to undergo dielectrophoretic motion and an electric field having a third frequency higher than the second frequency, which causes the particles to undergo dielectrophoretic motion and producing a second optical state different from the first optical state. - View Dependent Claims (9)
-
-
10. A dielectrophoretic display comprising:
-
a dielectrophoretic medium comprising a fluid and a plurality of at least one type of particle within the fluid, the particles being movable through the fluid on application of an electric field to the dielectrophoretic medium; at least one light-transmissive electrode disposed adjacent the dielectrophoretic medium so that the dielectrophoretic medium can be viewed through the light-transmissive electrode; and a conductor extending from the light-transmissive electrode to a voltage source, the conductor having a higher electrical conductivity than the light-transmissive electrode, the conductor contacting the light-transmissive electrode at least two spaced points. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
Specification