An anode cell array unit for an organic light emitting diode display. The anode cell array unit is disposed on a substrate structure unit including an active element for each pixel, and has an organic light emitting unit is disposed thereon. The anode cell array unit may include an insulating interlayer disposed on the substrate structure unit, and configured to be isolated from the active element, an anode structure disposed on the insulating interlayer, and electrically connected to the active element, an anode cell isolator being arranged to penetrate through the anode structure and to protrude upward from the anode structure, and being configured to define a plurality of cells by isolating the pixels from each other, and a leakage current suppressing layer pattern disposed on the anode structure to surround a sidewall of the anode cell isolator to be configured to suppress a leakage current that occurs in an area adjacent to an interface between the anode cell isolator and the anode structure