Pixel driving circuit, driving method for the pixel driving circuit, and display panel

A display panel, comprising:

• a base substrate;
• and
• a pixel driving circuit;
• and
• a light-emitting unit;
• wherein the pixel driving circuit is electrically connected to a first electrode of the light-emitting unit, and the pixel driving circuit is used to drive the light-emitting unit;
• wherein the display panel further comprises an active layer, and the active layer comprises a first initialization signal line and a second initialization signal line;
• wherein the active layer further comprises a tenth active portion, a second active portion and a fourth active portion, the tenth active portion is used to form a channel region of a driving transistor in the pixel driving circuit, the second active portion is used to form a channel region of a second transistor in the pixel driving circuit, and the fourth active portion is used to form a channel region of a fourth transistor in the pixel driving circuit.