When the plane shape of a bank edge, that is, the direction of a line segment connecting the centers of pixels adjacent to each other (the direction of the pixels) is orthogonal to the direction of a line segment formed by the bank edge, light leaks from the adjacent pixels. The shape of the luminous region of the pixel of a display device, that is, the edge shape of a bank opening is formed as follows. The direction of an approximately linear portion (a line segment) formed by a bank edge is not orthogonal to the direction of the most closely adjacent pixel (an acute angle or an obtuse angle is formed by the directions).