Display device

A display device, comprising:

• a substrate;
• a first active pattern and a second active pattern on the substrate, each of the first active pattern and the second active pattern including an oxide semiconductor;
• a first high permittivity insulation layer on the first active pattern, the first high permittivity insulation layer being patterned to overlap the first active pattern;
• a first inorganic insulation layer on the first high permittivity insulation layer;
• a second high permittivity insulation layer on the first inorganic insulation layer, the second high permittivity insulation layer being patterned to overlap the second active pattern;
• a first gate electrode and a second gate electrode on the first inorganic insulation layer and the second high permittivity insulation layer, respectively, the first gate electrode and the second gate electrode overlapping the first active pattern and the second active pattern, respectively;
• a second inorganic insulation layer on the first gate electrode and the second gate electrode;
• and
• a third high permittivity insulation layer on the second inorganic insulation layer, the third high permittivity insulation layer being patterned to overlap the first gate electrode.