Pixel circuit, display substrate, display panel and pixel driving method

A pixel circuit, comprising:

• a reference writing circuit, a threshold compensation circuit, a data writing circuit, a reset circuit, and a driving transistor;
• wherein,
• the reference writing circuit is electrically coupled to a reference voltage terminal, a first control signal line, and a control electrode of the driving transistor, and configured to write a reference voltage provided by the reference voltage terminal to the control electrode of the driving transistor in response to a control of the first control signal line;
• the data writing circuit is electrically coupled to a data line, the first control signal line and the threshold compensation circuit, and is configured to write a data voltage provided by the data line into the threshold compensation circuit in response to the control of the first control signal line;
• the threshold compensation circuit is electrically coupled to a second control signal line, the control electrode of the driving transistor and a second electrode of the driving transistor, and is configured to acquire a threshold voltage of the driving transistor, and provide a first control voltage to the control electrode of the driving transistor and a second control voltage to the second electrode of the driving transistor in response to a control of the second control signal line, so as to perform threshold compensation on the driving transistor;
• the reset circuit is electrically coupled to a reset voltage terminal and a third control signal line, and is configured to write a reset voltage provided by the reset voltage terminal into the pixel circuit in response to a control of the third control signal line;
• a first electrode of the driving transistor is electrically coupled to a first operating voltage terminal, the second electrode of the driving transistor is electrically coupled to a first electrode of a light emitting element, and the driving transistor is configured to output a corresponding driving current in response to a control of the first control voltage and the second control voltage so as to drive the light emitting element to emit light.