Pixel circuit, method for driving pixel circuit, display substrate, and display device

A pixel circuit, comprising:

• a driving unit comprising a first terminal, a second terminal and a third terminal, wherein the second terminal of the driving unit is coupled to a first electrode of a light-emitting element, and the driving unit is configured to provide a driving current to the light-emitting element in a light-emitting phase;
• a first light-emitting control unit coupled between a first power line and the first terminal of the driving unit, and configured to couple the first power line to the first terminal of the driving unit or decouple the first power line from the first terminal of the driving unit;
• a second light-emitting control unit coupled between the second terminal of the driving unit and the first electrode of the light-emitting element, and configured to couple the second terminal of the driving unit to the first electrode of the light-emitting element or decouple the second terminal of the driving unit from the first electrode of the light-emitting element;
• a threshold compensation unit coupled between the first terminal of the driving unit and the first electrode of the light-emitting element, and configured to couple the first terminal of the driving unit to the first electrode of the light-emitting element or decouple the first terminal of the driving unit from the first electrode of the light-emitting element;
• a first storage unit and a second storage unit, wherein the first storage unit and the second storage unit are coupled in series between the third terminal of the driving unit and the first electrode of the light-emitting element, and the first storage unit is coupled to the second storage unit at a first node;
• and
• a gating unit coupled between a first reference signal line and the first node, and configured to couple the first reference signal line to the first node or decouple the first reference signal line from the first node.