Patent ID: 8895989

Claim:
A thin-film semiconductor device for a display apparatus, the thin-film semiconductor device comprising: a substrate; a gate electrode above the substrate; a gate insulating film above the substrate to cover the gate electrode; a semiconductor layer on the gate insulating film; a first electrode above the semiconductor layer; a second electrode in a same layer as the first electrode; an interlayer insulating film above the gate insulating film to cover the first electrode and the second electrode; a gate line above the interlayer insulating film in a layer different from a layer including the gate electrode; and a power supply line in a same layer as the gate line and adjacent to the gate line, wherein the gate electrode and the gate line are electrically connected via a first conductive portion passing through the gate insulating film and the interlayer insulating film, a longest side of the power supply line extends in parallel with a longest side of the gate line, the power supply line and one of the first electrode and the second electrode are electrically connected via a second conductive portion passing through the interlayer insulating film, the power supply line supplies power to the first electrode or the second electrode, a width of the power supply line corresponds to a width of a gap between two adjacent gate lines, and the power supply line is arranged near the two adjacent gate lines to fill the gap between the two adjacent gate lines.