Pixel circuit and driving method thereof, display substrate and display apparatus

A pixel circuit, comprising:

• a light emitting module configured to emit light;
• a driving module configured to drive the light emitting module to emit light based on a driving voltage in a luminescence stage;
• a storage module configured to maintain and provide the driving voltage to the driving module in the luminescence stage;
• a first transistor having a first electrode coupled to a position from which the driving module acquires the driving voltage;
• a second transistor having a first electrode coupled to the first electrode of the first transistor, and a second electrode being not directly coupled to a signal source;
• and
• a voltage stabilizing capacitor having a first electrode coupled to the second electrode of the second transistor, and a second electrode coupled to a constant voltage signal source;
• the pixel circuit further comprises:
• a third transistor having a first electrode coupled to a second electrode of the first transistor, and a gate coupled to a gate of the first transistor;
• and
• a fourth transistor having a first electrode coupled to the second electrode of the second transistor, and a gate coupled to a gate of the second transistor;
• wherein the light emitting module comprises a light emitting device;
• the driving module comprises a driving transistor configured to drive the light emitting device to emit light based on a voltage at a gate of the driving transistor;
• and
• the storage module comprises a storage capacitor having a first electrode coupled to the gate of the driving transistor and configured to maintain the driving voltage at the first electrode of the storage capacitor and provide it to the driving module in the luminescence stage;
• wherein the pixel circuit comprises a first reset module and a writing module;
• the first reset module is configured to reset a voltage at the gate of the driving transistor based on signals from an initialization signal terminal and a first reset signal terminal;
• and the first reset module comprises:
• the first transistor;
• the third transistor having the first electrode coupled to the second electrode of the first transistor, a second electrode coupled to the initialization signal terminal, and the gate coupled to the gate of the first transistor and the first reset signal terminal;
• the writing module is configured to write the driving voltage to the first electrode of the storage capacitor based on signals from a gate signal terminal and a data signal terminal;
• and the writing module comprises:
• the second transistor;
• the fourth transistor having the first electrode coupled to the second electrode of the second transistor, a second electrode coupled to a second electrode of the driving transistor, and the gate coupled to the gate of the second transistor and the gate signal terminal;
• a fifth transistor having a first electrode coupled to a first electrode of the driving transistor, a second electrode coupled to the data signal terminal, and a gate coupled to the gate signal terminal;
• a sixth transistor having a first electrode coupled to a first power supply signal terminal, a second electrode coupled to the first electrode of the driving transistor, and a gate coupled to a control signal terminal;
• wherein the driving transistor and the light emitting device are connected in series between the first power supply signal terminal and a second power supply signal terminal;
• a second electrode of the storage capacitor is coupled to the first power supply signal terminal;
• and
• a second electrode of the light emitting device is coupled to the second power supply signal terminal;
• and
• the pixel circuit further comprises:
• a control module configured to control whether the light emitting device emits light based on a signal from the control signal terminal, and comprising a seventh transistor having a first electrode coupled to the second electrode of the driving transistor, a second electrode coupled to a first electrode of the light emitting device, and a gate coupled to the control signal terminal;
• and
• a second reset module configured to reset a voltage at the first electrode of the light emitting device based on a signal from a second reset signal terminal and the signal from the initialization signal terminal, and comprising an eighth transistor having a first electrode coupled to the first electrode of the light emitting device, a second electrode coupled to the initialization signal terminal, and a gate coupled to the second reset signal terminal.