An organic light-emitting diode (OLED) display panel is disclosed. In one aspect, the panel includes a first transistor which receives a data signal transferred through a data line in response to a scan signal transferred through a gate line and a second transistor which receives a first power signal in response to a bias signal and outputs a source-driving signal. The panel also includes a third transistor which receives the source-driving signal in response to an output signal of the first transistor and outputs a driving signal, an organic light-emitting element which comprises a first electrode being connected to the third transistor and which receives the driving signal and a second electrode which receives a second power signal. The panel further includes a fourth transistor which is electrically connected to the third transistor and which receives the driving signal.