A display device (DD) comprising: a display panel (DP); and an input sensing unit (ISU) comprising a sensing electrode and disposed directly on the display panel (DP), the display panel (DP) comprises: a light emitting element (EML) comprising a first electrode (AE) disposed on a base insulation layer, a second electrode (CE), and a light emitting layer (EML) disposed between the first electrode (AE) and the second electrode (CE); a pixel defining layer (PDL) disposed between the second electrode (CE) and the base insulation layer, and comprising a first portion (PDL-10), in which an opening to expose the first electrode (AE) is defined; and a plurality of interlayers (CPL, IS-IL) disposed on a plurality of thin-films (TFE) disposed on the second electrode (CE); and one of the plurality of interlayers (CPL, IS-IL) comprises a first area, which overlaps the first portion (PDL-10) of the pixel defining layer (PDL) characterized in that the pixel defining layer (PDL) further comprises a second portion (PDL-20), which is disposed adjacent to the first portion (PDL-10) and has a thickness (TH2) greater than that of the first portion (PDL-10); and the one of the plurality of interlayers (CPL, IS-IL) further comprises a second area, which overlaps the second portion (PDL-20) of the pixel defining layer (PDL) and has a thickness (TH5) greater than that of the first area, wherein a difference in thickness between the second area and the first area is substantially the same as difference in thickness between the second portion (PDL-20) and the first portion (PDL-10), such that a distance between the second electrode and the sensing electrode is uniform. a display panel (DP); and an input sensing unit (ISU) comprising a sensing electrode and disposed directly on the display panel (DP), the display panel (DP) comprises: a light emitting element (EML) comprising a first electrode (AE) disposed on a base insulation layer, a second electrode (CE), and a light emitting layer (EML) disposed between the first electrode (AE) and the second electrode (CE); a pixel defining layer (PDL) disposed between the second electrode (CE) and the base insulation layer, and comprising a first portion (PDL-10), in which an opening to expose the first electrode (AE) is defined; and a light emitting element (EML) comprising a first electrode (AE) disposed on a base insulation layer, a second electrode (CE), and a light emitting layer (EML) disposed between the first electrode (AE) and the second electrode (CE); a pixel defining layer (PDL) disposed between the second electrode (CE) and the base insulation layer, and comprising a first portion (PDL-10), in which an opening to expose the first electrode (AE) is defined; and a plurality of interlayers (CPL, IS-IL) disposed on a plurality of thin-films (TFE) disposed on the second electrode (CE); and one of the plurality of interlayers (CPL, IS-IL) comprises a first area, which overlaps the first portion (PDL-10) of the pixel defining layer (PDL) characterized in that the pixel defining layer (PDL) further comprises a second portion (PDL-20), which is disposed adjacent to the first portion (PDL-10) and has a thickness (TH2) greater than that of the first portion (PDL-10); and the one of the plurality of interlayers (CPL, IS-IL) further comprises a second area, which overlaps the second portion (PDL-20) of the pixel defining layer (PDL) and has a thickness (TH5) greater than that of the first area, wherein a difference in thickness between the second area and the first area is substantially the same as difference in thickness between the second portion (PDL-20) and the first portion (PDL-10), such that a distance between the second electrode and the sensing electrode is uniform. <EOS>