Display devices are disclosed. The display device comprises a substrate including an electrostatic discharge area where an electrostatic discharge element is disposed and a normal area surrounding the electrostatic discharge area, a lower planarization layer disposed on the substrate, a first trench positioned between the electrostatic discharge area and the normal area, and disposed in the lower planarization layer, a first upper planarization layer positioned in the normal area, and disposed on the lower planarization layer, and an insulation layer disposed on the first upper planarization layer, the first trench, and the lower planarization layer, and formed of an inorganic material, thereby preventing electrolytic corrosion in the electrostatic discharge area.