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

A pixel circuit, comprising:

• a reference writing circuit, a threshold compensation circuit, a data writing circuit, a light emission control circuit, a driving transistor, and a light emitting device;
• wherein
• the reference writing circuit is coupled to a reference voltage terminal, a first control signal line and a control electrode of the driving transistor and is configured to write a reference voltage supplied by the reference voltage terminal to the control electrode of the driving transistor in response to the control of the first control signal line;
• the data writing circuit is coupled to a data line, a second control signal line and the control electrode of the driving transistor and is configured to write a data voltage supplied by the data line to the control electrode of the driving transistor in response to the control of the second control signal line;
• the threshold compensation circuit is coupled to a third control signal line, the control electrode of the driving transistor, a first electrode of the driving transistor, a second electrode of the driving transistor, a first power terminal and a fixed voltage terminal, and is configured to acquire a threshold voltage of the driving transistor, and apply, in response to the control of the second control signal line and the control of the third control signal line, 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, respectively, and a difference between the first control voltage and the second control voltage is related to the threshold voltage of the driving transistor;
• the light emission control circuit is coupled to a fifth control signal line and is configured to control connection/disconnection between the second electrode of the driving transistor and a first electrode of the light emitting device in response to the control of the fifth control signal line;
• and
• the driving transistor is configured to output a corresponding driving current in response to the control of the first control voltage and the second control voltage, so as to drive the light emitting device.