An electrowetting display device comprising a picture element, the picture element comprising: a first support plate and a second support plate; a space between the first support plate and the second support plate, the space comprising a first fluid and a second fluid immiscible with the first fluid, wherein the first support plate comprises: a first surface comprising a display area (20, 20A, 20B, 20E) adjoining the space, within which the first fluid is confined; a wall, protruding from the first support plate, formed outside the display area (20, 20A, 20B, 20E) along at least a part of a perimeter of the display area (20, 20A, 20B, 20E), the wall having a second surface (19, 19A, 19E) facing the display area (20, 20A, 20B, 20E) and adjoining the space, wherein the first surface and at least a section of the second surface (19, 19A, 19E) are more wettable to the first fluid than to the second fluid; and an electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) comprising at least a first portion (24", 30", 30A", 30E", 36A", 36B") and a second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D'), the first portion (24", 30", 30A", 30E", 36A", 36B") adjacent to the first surface and the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') adjacent to at least a part of the section of the second surface (19, 19A, 19E), wherein the section of the second surface (19, 19A, 19E) extends up the wall a sufficient distance for the section of the second surface to be adjacent to an interface line with a zero applied voltage between the electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) and the second fluid, the interface line being a line at which an interface between the first fluid and the second fluid contacts the second surface (19, 19A, 19E), and wherein the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') extends up the wall a sufficient distance for the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') to be adjacent to the interface line with the zero applied voltage between the electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) and the second fluid, the electrowetting display device further comprising at least one further electrode in electrical contact with the second fluid. a first support plate and a second support plate; a space between the first support plate and the second support plate, the space comprising a first fluid and a second fluid immiscible with the first fluid, wherein the first support plate comprises: a first surface comprising a display area (20, 20A, 20B, 20E) adjoining the space, within which the first fluid is confined; a wall, protruding from the first support plate, formed outside the display area (20, 20A, 20B, 20E) along at least a part of a perimeter of the display area (20, 20A, 20B, 20E), the wall having a second surface (19, 19A, 19E) facing the display area (20, 20A, 20B, 20E) and adjoining the space, wherein the first surface and at least a section of the second surface (19, 19A, 19E) are more wettable to the first fluid than to the second fluid; and an electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) comprising at least a first portion (24", 30", 30A", 30E", 36A", 36B") and a second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D'), the first portion (24", 30", 30A", 30E", 36A", 36B") adjacent to the first surface and the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') adjacent to at least a part of the section of the second surface (19, 19A, 19E), a first surface comprising a display area (20, 20A, 20B, 20E) adjoining the space, within which the first fluid is confined; a wall, protruding from the first support plate, formed outside the display area (20, 20A, 20B, 20E) along at least a part of a perimeter of the display area (20, 20A, 20B, 20E), the wall having a second surface (19, 19A, 19E) facing the display area (20, 20A, 20B, 20E) and adjoining the space, wherein the first surface and at least a section of the second surface (19, 19A, 19E) are more wettable to the first fluid than to the second fluid; and an electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) comprising at least a first portion (24", 30", 30A", 30E", 36A", 36B") and a second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D'), the first portion (24", 30", 30A", 30E", 36A", 36B") adjacent to the first surface and the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') adjacent to at least a part of the section of the second surface (19, 19A, 19E), wherein the section of the second surface (19, 19A, 19E) extends up the wall a sufficient distance for the section of the second surface to be adjacent to an interface line with a zero applied voltage between the electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) and the second fluid, the interface line being a line at which an interface between the first fluid and the second fluid contacts the second surface (19, 19A, 19E), and wherein the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') extends up the wall a sufficient distance for the second portion (24', 30', 30A', 30E', 36A', 36B', 36C', 36D') to be adjacent to the interface line with the zero applied voltage between the electrode (24, 30, 30A, 30E, 36A, 36B, 36C, 36D) and the second fluid, the electrowetting display device further comprising at least one further electrode in electrical contact with the second fluid.