Pixel driving circuit, driving method thereof, array substrate and display device

The invention provides a pixel driving circuit, a driving method thereof, an array substrate and a display device, and relates to the technical field of displaying. The pixel driving circuit, the driving method, the array substrate and the display device are used for reducing the power consumption of the pixel driving circuit and simplifying the driving method of the pixel driving circuit. The pixel driving circuit comprises a reset unit, a data writing unit, a compensation unit and a light emitting unit. The reset unit is used for outputting a reference signal. The data writing unit is used for outputting a data signal. The compensation unit is connected with the reset unit, connected with the data writing unit and further connected with an output node. A voltage signal of a power source is received by the compensation unit, and the compensation unit is used for resetting the potential of the output node to the reset potential, upwards pulling the potential of the output node to the first potential from the reset potential, upwards pulling the potential of the output node to the second potential from the first potential, generating a light emitting driving signal and outputting the light emitting driving signal to the output node. The light emitting unit is connected with the output node, further connected with the negative electrode of the power source and used for being driven by the light emitting driving signal to emit light in the light emitting period. The pixel driving circuit is used for driving the light emitting unit to emit light.