Pixel driving circuit, driving method thereof and display panel

A pixel driving circuit, comprising a driving transistor, a capacitor and a light emitting device, wherein both terminals of the capacitor are connected to a first power terminal and a gate electrode of the driving transistor, respectively, wherein the pixel driving circuit further comprises:

• a reset module configured to transmit a signal at an initialization voltage terminal to the gate electrode of the driving transistor and a first terminal of the light emitting device in a reset phase, to initialize potentials at the gate electrode of the driving transistor and the first terminal of the light emitting device;
• a data writing module configured to write a data signal at a data writing terminal into a first electrode of the driving transistor in a data writing phase;
• a threshold compensation module comprising a compensation transistor, which is configured to electrically connect a second electrode and the gate electrode of the driving transistor together in the data writing phase;
• and
• a light emitting control module comprising a first gating transistor and configured to disconnect the first power terminal from the first electrode of the driving transistor in the reset phase and the data writing phase;
• wherein the first gating transistor is configured to electrically connect the second electrode of the driving transistor and the light emitting device in the reset phase and disconnect the second electrode of the driving transistor from the light emitting device in the data writing phase;
• the light emitting control module is configured to electrically connect the first power terminal and the first electrode of the driving transistor and electrically connect the second electrode of the driving transistor and the light emitting device in a light emitting phase;
• and
• wherein the compensation transistor is an oxide transistor, the driving transistor is a low-temperature polysilicon transistor, and the first gating transistor is an oxide transistor;
• the pixel driving circuit further comprises a substrate, and the first gating transistor, the compensation transistor and the driving transistor are on the substrate;
• and
• the pixel driving circuit further comprises a first insulating layer, a second insulating layer, a third insulating layer, an interlayer dielectric layer, a planarization layer, and a pixel defining layer sequentially on the substrate,
• wherein an active layer of the driving transistor is between the substrate and the first insulating layer;
• the gate electrode of the driving transistor is on the active layer of the driving transistor and between the first insulating layer and the second insulating layer;
• the first electrode and the second electrode of the driving transistor are in a same layer and between the interlayer dielectric layer and the planarization layer;
• and
• the gate electrode of the compensation transistor, the gate electrode of the first gating transistor and the gate electrode of the driving transistor are in a same layer and between the first insulating layer and the second insulating layer;
• an active layer of the compensation transistor and an active layer of the first gating transistor are in a same layer and between the second insulating layer and the third insulating layer;
• and the first electrode and the second electrode of the compensation transistor, the first electrode and the second electrode of the first gating transistor and the first electrode and the second electrode of the driving transistor are in a same layer and between the interlayer dielectric layer and the planarization layer.