Pixel driving circuit, and display panel and driving method thereof

A display panel, comprising:

• a pixel driving circuit, wherein the pixel driving circuit includes:
• a first power signal terminal and a second power signal terminal, wherein the first power signal terminal receives a first voltage signal, and the second power signal terminal receives a second voltage signal;
• a driving transistor, configured to provide a driving current in a light-emitting stage, wherein a gate of the driving transistor is connected to a first node, a first end of the driving transistor is connected to a second node, and a second end of the driving transistor is connected to a third node;
• a light-emitting component, connected in series between the driving transistor and the second power signal terminal and configured to emit light in response to the driving current;
• a light-emitting controller, connected in series between the first power signal terminal and the light-emitting component, wherein a control terminal of the light-emitting controller is connected to a first output terminal of a light-emitting control circuit;
• and
• a bias unit, with a first electrode electrically connected to the third node and a second electrode electrically connected to a second output terminal of the light-emitting control circuit multiplexed as a signal input terminal of the bias unit, and in response to a first control signal, the bias unit configured to transmit a first signal outputted by the light-emitting control circuit to the third node to adjust a bias state of the driving transistor,
• wherein the light-emitting control circuit includes a plurality of cascaded light-emitting control circuit units, and the first output terminal of the light-emitting control circuit and the second output terminal of the light-emitting control circuit correspond to a same output terminal of a light-emitting control circuit unit at a same level or different output terminals of light-emitting control circuit units at different levels.

A driving method of a display panel, comprising:

• providing a display panel including a driving transistor, a data writing unit, a compensation unit, a light-emitting controller, a bias unit, and a light-emitting component, wherein:
• the driving transistor is configured to provide a driving current in a light-emitting stage, wherein a gate of the driving transistor is connected to a first node, a first end of the driving transistor is connected to a second node, and a second end of the driving transistor is connected to a third node,
• the light-emitting controller is connected in series between the driving transistor and the light-emitting component, wherein a control terminal of the light-emitting controller is connected to a first output terminal of a light-emitting control circuit, and
• a first electrode of the bias unit is electrically connected to the third node and a second electrode of the bias unit is electrically connected to a second output terminal, of the light-emitting control circuit, multiplexed as a signal input terminal of the bias unit, wherein the light-emitting control circuit includes a plurality of cascaded light-emitting control circuit units, and the first output terminal of the light-emitting control circuit and the second output terminal of the light-emitting control circuit correspond to a same output terminal of a light-emitting control circuit unit at a same level or different output terminals of light-emitting control circuit units at different levels;
• in a first bias stage of a driving cycle of the display panel, in response to a first control signal, transmitting, by the bias unit, a first signal outputted by the light-emitting control circuit to the third node to adjust a bias state of the driving transistor;
• in a data writing stage of the driving cycle of the display panel, providing, by the data writing unit, a data signal for the driving transistor, and detecting and self-compensating, by the compensation unit, a deviation of a threshold voltage of the driving transistor;
• and
• in the light-emitting stage of the driving cycle of the display panel, in response to the driving current, emitting light by the light-emitting component.