Pixel driving circuit, driving method thereof, and display panel

A driving method of a pixel driving circuit, configured to drive the pixel driving circuit, wherein the pixel driving circuit comprises:

• a light emitting device electrically connected between a first node and a first voltage terminal;
• a driving transistor electrically connected to the first node, a second node, and a second voltage terminal, wherein the driving transistor is configured to generate a driving current to drive the light emitting device to emit light;
• a pulse amplitude modulation module electrically connected to the driving transistor and configured to output a pulse amplitude modulation voltage to the driving transistor to control an amplitude of the driving current;
• and
• a pulse width modulation module electrically connected to the second node, the second voltage terminal, and the pulse amplitude modulation module and configured to control a duration of the driving transistor outputting the driving current according to a sweep voltage;
• wherein the driving method of the pixel driving circuit comprises:
• transmitting the pulse amplitude modulation voltage to the driving transistor through the pulse amplitude modulation module, such that the driving transistor controls the amplitude of the driving current according to the pulse amplitude modulation voltage;
• and
• receiving the sweep voltage through the pulse width modulation module to control a moment when the driving transistor stops outputting the driving current and control the duration of the driving transistor outputting the driving current.

A display panel, comprising:

• a pixel driving circuit comprising:
• a light emitting device electrically connected between a first node and a first voltage terminal;
• a driving transistor electrically connected to the first node, a second node, and a second voltage terminal, wherein the driving transistor is configured to generate a driving current to drive the light emitting device to emit light;
• a pulse amplitude modulation module electrically connected to the driving transistor and configured to output a pulse amplitude modulation voltage to the driving transistor to control an amplitude of the driving current;
• and
• a pulse width modulation module electrically connected to the second node, the second voltage terminal, and the pulse amplitude modulation module and configured to control a duration of the driving transistor outputting the driving current according to a sweep voltage.