A method of manufacturing a display device, includes: providing an adhesive tape including: an adhesive conductive layer on a base film, a cutting width corresponding to a width of an adhesive tape attaching area of a substrate and provided in plurality including cutting widths adjacent to each other along the base film, and an interval between the cutting widths adjacent to each other; within the interval, providing a plurality of half-cuts in the adhesive tape, to provide a multi-cut adhesive tape; and pressing the multi-cut adhesive tape to the substrate, at a first portion of the multi-cut adhesive tape which corresponds to the cutting width, to separate the first portion of the multi-cut adhesive tape from the base film and attach the first portion of the multi-cut adhesive tape to the substrate at the adhesive tape attaching area thereof.