A thin film transistor substrate includes a substrate including a display area including: pixels and a periphery area where a driver for driving the pixels is disposed; first signal lines connected with the pixels and extended to the periphery area, and including first short-circuit portions provided in the periphery area; second signal lines connected with the pixels and extended to the periphery area by crossing the first signal lines in an insulated manner; first connection members overlapping lateral ends of the first signal lines, disposed in lateral sides with respect to the first short-circuited portions, and formed of a doped semiconductor; and first repairing conductors overlapping the lateral ends of the first signal lines, and disposed in the lateral sides with respect to the first short-circuited portions. Lateral ends of the first connection members are connected with the lateral ends of the first signal lines through contact holes.