A thin film transistor array panel is provided according to one or more embodiments. In an embodiment, the thin film transistor array panel includes: a base substrate that has a display area and a peripheral area; a plurality of thin film transistors that are formed in the display area; a plurality of signal input pads that are formed in the peripheral area and that are formed long in a first direction; and a plurality of signal lines that are connected to the thin film transistors and the signal input pads, wherein at least a part of each of the plurality of signal input pads is arranged in a line along the first direction.