A thin film transistor substrate is provided. The thin film transistor substrate includes a display area including a plurality of pixels, wherein the pixels are connected to gate lines and data lines, a gate driver connected to the gate lines, a plurality of data pads connected to the data lines, a plurality of dummy pattern parts formed of a same layer as the gate lines, and a non-display area in which the gate driver, data pads, and dummy pattern parts are disposed, and the dummy pattern parts are disposed in an area within the non-display area where the gate driver is not disposed, and one of the dummy pattern parts is disposed overlapping with the data pads.