Display panel and pixel circuit thereof

The invention provides a pixel circuit and a display panel. The pixel circuit comprises a driving unit, a light-emitting element and a light-emitting control circuit which are connected in series between a power supply voltage and a reference power supply; the first driving block is coupled to a control end of the driving unit and a vertical signal line, and is used for outputting a control signal to the driving unit according to a pulse width modulation signal and an amplitude modulation signal, and receiving a reference voltage from the vertical signal line at a light emitting time, receiving the pulse width modulation signal from the vertical signal line at a data writing time; and the second driving block is connected to the vertical signal line and is used for outputting the reference voltage to the first driving block through the vertical signal line at the light emitting time. The data writing time and the light emitting time form a frame. 本发明提供一种像素电路及显示面板。像素电路包括：一驱动单元、一发光元件及一发光控制电路串联连接于一电源电压及一参考电源之间；一