Disclosed is a method of manufacturing a display device having a display area and a non-display area, the method including aligning a mask over a substrate, the mask including a central shield portion, a peripheral shield portion outside the central shield portion, with an opening between the central shield portion and the peripheral shield portion, a holding portion in the opening that connects the central shield portion with the peripheral shield portion, and a diffusion area under the holding portion defined by a thickness difference of the mask between the holding portion and one of the central and peripheral shield portions; depositing a conductive material on the substrate through the mask to form a single pieced, loop-shaped conductive path surrounding the display area in the non-display area; and forming a transparent conductive layer on the substrate, the transparent conductive layer being continuously formed in the display and non-display areas and formed to be in direct contact with the single pieced, loop-shaped conductive path.