Pixel driving circuit and operation method

A pixel driving circuit comprises a driving unit. A first control signal is received through a first control terminal, and bias voltage is conducted on the driving unit based on the first control terminal, so as to provide driving current to a light-emitting assembly. One end of the capacitance is connected to a second control terminal of the driving unit, and the other end is connected to a firstend or a second end of the driving unit. A compensation unit receives a second control signal through the first control terminal, and bias voltage is conducted on the compensation unit based on the second control terminal. A first switch unit receives a third control signal through the control terminal, so as to conduct the first switch unit. A second switch unit receives a fourth control signalthrough the control terminal, so as to conduct the second switch unit. A third control unit receives the third control signal or the fourth control signal through the control terminal, so as to conduct the third switch unit. 像