A pixel driving circuit and method, an array substrate and a display device

A pixel driving circuit for driving an organic light emitting diode to emit light, comprising:

• a charge storage unit, a first terminal of the charge storage unit receiving a power supply voltage signal;
• a driving unit, a control terminal of the driving unit being connected with a second terminal of the charge storage unit, for generating a driving current that drives the organic light emitting diode to emit light when a voltage of the second terminal of the charge storage unit is greater than a threshold voltage of the driving unit;
• a reset unit, connected with the second terminal of the charge storage unit, for writing a voltage of an initial voltage signal into the second terminal of the charge storage unit in a reset phase;
• a data write unit, connected with the second terminal of the charge storage unit, for writing a voltage of a data voltage signal and the threshold voltage of the driving unit into the second terminal of the charge storage unit in a data write phase;
• and
• a light emitting control unit, connected with the driving unit, for controlling the power supply voltage signal to be written into the driving unit so as to generate the driving signal in a light emitting phase.