Display device having a plurality of conductive layers

A display device comprising:

• a substrate including a display area and a pad area on one side of the display area;
• a plurality of conductive layers on the substrate, and in the display area and the pad area;
• a passivation layer on the conductive layers;
• and
• a plurality of light-emitting elements on the passivation layer and in the display area, the plurality of light-emitting elements being spaced apart from one another
• wherein
• at least one of the conductive layers comprises a first metal layer, a second metal layer on the first metal layer, and a third metal layer on the second metal layer,
• the first metal layer comprises vanadium (V),
• the second metal layer comprises aluminum (Al) or an Al alloy,
• the third metal layer comprises V or titanium (Ti),
• a thickness of the second metal layer is greater than a thickness of the first metal layer and a thickness of the third metal layer, and
• the thickness of the first metal layer is greater than the thickness of the third metal layer.

A display device comprising:

• a substrate including a display area and a pad area on one side of the display area;
• a first conductive layer on the substrate and comprising a lower metal layer in the display area and a first pad wire in the pad area;
• a buffer layer on the first conductive layer;
• a semiconductor layer on the buffer layer and overlapping with the lower metal layer in the display area;
• a gate insulating layer on the semiconductor layer and the buffer layer;
• a second conductive layer on the gate insulating layer and comprising a gate electrode overlapping with the semiconductor layer and in the display area, and a second pad wire overlapping with the first pad wire and in the pad area;
• a first interlayer insulating layer on the second conductive layer;
• a third conductive layer on the first interlayer insulating layer and comprising a capacitor electrode overlapping with the gate electrode and in the display area;
• a second interlayer insulating layer on the third conductive layer;
• a fourth conductive layer on the second interlayer insulating layer and comprising a first connection electrode connected to the semiconductor layer and the lower metal layer, and in the display area;
• a passivation layer on the fourth conductive layer;
• and
• a plurality of light-emitting elements on the passivation layer and spaced apart from one another,
• wherein both the lower metal layer and the first pad wire of the first conductive layer comprise a first metal layer comprising vanadium (V), a second metal layer on the first metal layer and comprising aluminum (Al) or an Al alloy, and a third metal layer on the second metal layer and comprising V or titanium (Ti).