Pixel driving circuit and driving method

A driving method for a pixel driving circuit, the pixel driving circuit comprising a driving circuit, a first data writing circuit, a second data writing circuit, and a storage circuit, the driving method for the pixel driving circuit comprising:

• in a first phase, inputting a control signal to a control terminal of the first data writing circuit to control the first data writing circuit to be turned on to write an initial voltage to a control terminal of the driving circuit;
• and inputting a control signal to a control terminal of the second data writing circuit to control the second data writing circuit to be turned on to store a voltage difference between an initial grayscale voltage and the initial voltage;
• in a second phase, inputting a control signal to the control terminal of the second data writing circuit to control the second data writing circuit to be turned on to couple a display grayscale voltage with the voltage difference, so that a voltage of the control terminal of the driving circuit is coupled to a superposition of the display grayscale voltage and the voltage difference;
• and
• in a third phase, turning on the driving circuit under control of a control terminal of the driving circuit, so as to drive a light-emitting device to emit light.