Display device having first transistor, second transistor, and third transistor disposed on different layers

A display device comprising:

• a first transistor, a second transistor, and a third transistor that are disposed on different layers, respectively;
• a capacitor;
• a first semiconductor layer disposed over a substrate and including a semiconductor pattern of the first transistor;
• a first gate insulating film disposed over the first semiconductor layer;
• a first conductive layer disposed over the first gate insulating film and including a gate electrode of the first transistor;
• a first interlayer insulating film disposed over the first conductive layer;
• a second semiconductor layer disposed over the first interlayer insulating film and including a semiconductor pattern of the second transistor;
• a second gate insulating film disposed over the second semiconductor layer;
• a second conductive layer disposed over the second gate insulating film and including:
• a gate electrode of the second transistor;
• and
• a first electrode of the capacitor electrically connected to the gate electrode of the second transistor;
• a second interlayer insulating film disposed over the second conductive layer;
• a third conductive layer including a second electrode of the capacitor disposed over the second interlayer insulating film;
• a third interlayer insulating film disposed over the third conductive layer;
• a third semiconductor layer disposed over the third interlayer insulating film and including a semiconductor pattern of the third transistor;
• a third gate insulating film disposed over the third semiconductor layer;
• and
• a fourth conductive layer disposed over the third gate insulating film and including a gate electrode of the third transistor.