An OLED display panel according to the present invention comprises: a substrate; a plurality of banks, each having a tapered shape of cross section in a traverse direction comprises by a pair of side surfaces, an upper surface and a bottom surface respectively connected to the side surfaces, the banks being arranged on a top surface of the substrate in side by side at an interval; and an electrode layer covering the top surface of the substrate between banks and the side surfaces of the banks adjacent to such top surface.