An electrowetting display device comprising a first support plate including: a surface; and a first electrode, a second support plate; and a protrusion having a protrusion surface. The protrusion is formed as part of at least one of the first or second support plates. The protrusion has an elongate shape extending from one to the other of the first or second support plates. The device further comprises a first fluid adjoining at least one of the protrusion surface or the surface of the first support plate; a second fluid immiscible with the first fluid; a second electrode in electrical contact with the second fluid; and a third electrode.