A display device, comprising: a substrate ; a display region (DP) disposed over the substrate and comprising a plurality of subpixels (SP); and a data pad part disposed in regions other than the display region (DP), wherein the data pad part comprises: a data signal line (DSL) extended from the display region (DP); an insulating film (ILD2) disposed on the data signal line (DSL) and insulating the data signal line (DSL), wherein the insulating film (ILD2) includes a via hole (VIA) which partially exposes the data signal line (DSL); a data pad electrode (DPE) disposed on the insulating film (ILD2) and connected to the data signal line (DSL) through the via hole (VIA); and an insulating pattern (OIL) configured to cover the via hole (VIA), characterized in that the data pad electrode (DPE) includes at least one electrode hole (SH), the at least one electrode hole (SH) exposes the insulating film (ILD2) which is disposed under the data pad electrode (DPE), at least part of the at least one electrode hole (SH) overlaps the insulating pattern (OIL), and the insulating pattern (OIL) comes into contact with the insulating film (ILD2) through the at least one electrode hole (SH). a substrate ; a display region (DP) disposed over the substrate and comprising a plurality of subpixels (SP); and a data pad part disposed in regions other than the display region (DP), wherein the data pad part comprises: a data signal line (DSL) extended from the display region (DP); an insulating film (ILD2) disposed on the data signal line (DSL) and insulating the data signal line (DSL), wherein the insulating film (ILD2) includes a via hole (VIA) which partially exposes the data signal line (DSL); a data pad electrode (DPE) disposed on the insulating film (ILD2) and connected to the data signal line (DSL) through the via hole (VIA); and an insulating pattern (OIL) configured to cover the via hole (VIA), characterized in that the data pad electrode (DPE) includes at least one electrode hole (SH), the at least one electrode hole (SH) exposes the insulating film (ILD2) which is disposed under the data pad electrode (DPE), at least part of the at least one electrode hole (SH) overlaps the insulating pattern (OIL), and the insulating pattern (OIL) comes into contact with the insulating film (ILD2) through the at least one electrode hole (SH). a data signal line (DSL) extended from the display region (DP); an insulating film (ILD2) disposed on the data signal line (DSL) and insulating the data signal line (DSL), wherein the insulating film (ILD2) includes a via hole (VIA) which partially exposes the data signal line (DSL); a data pad electrode (DPE) disposed on the insulating film (ILD2) and connected to the data signal line (DSL) through the via hole (VIA); and an insulating pattern (OIL) configured to cover the via hole (VIA), characterized in that the data pad electrode (DPE) includes at least one electrode hole (SH), the at least one electrode hole (SH) exposes the insulating film (ILD2) which is disposed under the data pad electrode (DPE), at least part of the at least one electrode hole (SH) overlaps the insulating pattern (OIL), and the insulating pattern (OIL) comes into contact with the insulating film (ILD2) through the at least one electrode hole (SH). <EOS>