Pixel circuit and driving method thereof

A pixel circuit and a driving method thereof are provided. In the pixel circuit, a pulse amplitude control circuit is coupled between a cathode terminal of a light-emitting diode and a system low voltage, generates a driving current of the light-emitting diode according to first and second control signals, a light-emitting control signal and a pulse width control signal, and controls the magnitude of the driving current according to first and second reference voltages. A pulse width control circuit is coupled between the pulse amplitude control circuit and a first reference voltage, adjusts the voltage level of a first control terminal according to the first and second control signals and a scan voltage, adjusts the voltage level of a second control terminal according to a third reference voltage, and generates the pulse width control signal according to the voltage level of the first control terminal, the voltage level of the second control terminal and the light-emitting control signal to control a transien