A display device, comprising: a substrate including first and second pixel regions (P1, P2) and two third pixel regions, wherein one of the first and second pixel regions (P1, P2) is a red pixel region, the other one of the first and second pixel regions (P1, P2) is a green pixel region, and each of the two third pixel regions is a blue pixel region; a first electrode in each of the first and second pixel regions (P1, P2) and the two third pixel regions; and a bank at a boundary of the first and second pixel regions (P1, P2) and the two third pixel regions on the first electrode to define a first opening exposing a portion of the first electrode and a second opening defining a formation area of an emitting layer, the second opening greater than the first opening, the bank surrounding the first pixel region and the second pixel region and the two third pixel regions, wherein an area of the first opening in the first pixel region is smaller than an area of the first opening in the second pixel region, and an area of the second opening in the first pixel region is substantially same as an area of the second opening in the second pixel region, wherein the area of the first opening in the first pixel region is greater than an area of the first opening in each of the two third pixel regions, and the area of the second opening in the first pixel region is substantially same as an area of the second opening in each of the two third pixel regions, wherein the bank has a first bank pattern ( (272, 372) defining the first opening and a second bank pattern defining the second opening on the first bank pattern, wherein the first bank pattern in the first pixel region protrudes from the second bank pattern in the first pixel region by a same first length on opposite sides of the first opening along a first direction, and the first bank pattern in the second pixel region protrudes from the second bank pattern in the second pixel region by a same second length, which is smaller than the first length, on opposite sides of the first opening along the first direction, wherein the first bank pattern is formed of a hydrophilic material and the second bank pattern is formed of a hydrophobic material, wherein one of the two third pixel regions is positioned between the first and second pixel regions (P 1, P2), and one of the first and second pixel regions (P 1, P2) is positioned between the two third pixel regions, and wherein the first pixel region, the second pixel region and the two third pixel regions constitute a unit pixel region. a substrate including first and second pixel regions (P1, P2) and two third pixel regions, wherein one of the first and second pixel regions (P1, P2) is a red pixel region, the other one of the first and second pixel regions (P1, P2) is a green pixel region, and each of the two third pixel regions is a blue pixel region; a first electrode in each of the first and second pixel regions (P1, P2) and the two third pixel regions; and a bank at a boundary of the first and second pixel regions (P1, P2) and the two third pixel regions on the first electrode to define a first opening exposing a portion of the first electrode and a second opening defining a formation area of an emitting layer, the second opening greater than the first opening, the bank surrounding the first pixel region and the second pixel region and the two third pixel regions, wherein an area of the first opening in the first pixel region is smaller than an area of the first opening in the second pixel region, and an area of the second opening in the first pixel region is substantially same as an area of the second opening in the second pixel region, wherein the area of the first opening in the first pixel region is greater than an area of the first opening in each of the two third pixel regions, and the area of the second opening in the first pixel region is substantially same as an area of the second opening in each of the two third pixel regions, wherein the bank has a first bank pattern ( (272, 372) defining the first opening and a second bank pattern defining the second opening on the first bank pattern, wherein the first bank pattern in the first pixel region protrudes from the second bank pattern in the first pixel region by a same first length on opposite sides of the first opening along a first direction, and the first bank pattern in the second pixel region protrudes from the second bank pattern in the second pixel region by a same second length, which is smaller than the first length, on opposite sides of the first opening along the first direction, wherein the first bank pattern is formed of a hydrophilic material and the second bank pattern is formed of a hydrophobic material, wherein one of the two third pixel regions is positioned between the first and second pixel regions (P 1, P2), and one of the first and second pixel regions (P 1, P2) is positioned between the two third pixel regions, and wherein the first pixel region, the second pixel region and the two third pixel regions constitute a unit pixel region.