Electrophoretic display having dielectric coating on electrode

An electrophoretic display comprising:

• an electrophoretic medium comprising a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid on application of an electric field to the electrophoretic medium;
• a plurality of first electrodes disposed adjacent the electrophoretic medium and arranged to apply an electric field thereto, wherein each of the plurality of first electrodes has a central region and a peripheral region;
• a voltage control means to vary the potential of the plurality of first electrodes independently of one another;
• a dielectric layer disposed between the electrophoretic medium and the plurality of first electrodes;
• and
• a second electrode disposed on the opposite side of the electrophoretic medium from the plurality of first electrodes adjacent the dielectric layer,
• wherein the dielectric layer is provided with a plurality of apertures extending through the dielectric layer to the central region and peripheral region for each of the plurality of first electrodes, the apertures extending to the central region having a size and/or number of apertures per unit area greater than a size and/or number of apertures per unit area for the plurality of apertures extending to the peripheral region.