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

A display substrate, comprising a plurality of pixel circuits, each of which comprises:

• a light emitting module configured to emit light;
• a driving module configured to drive the light emitting module to emit light according to a driving voltage during a light emitting stage;
• a storage module configured to maintain the driving voltage and to provide the driving voltage to the driving module during the light emitting stage;
• a first transistor, a first electrode of the first transistor being connected to the driving module, and a second electrode of the first transistor being not directly connected to a signal source;
• and
• a third transistor, a first electrode of the third transistor being connected to the second electrode of the first transistor, and a gate of the third transistor being connected to a gate of the first transistor;
• wherein the display substrate further comprises a plurality of first initialization signal lines arranged along a first direction and a plurality of second initialization signal lines arranged along the first direction, and are configured to receive voltages with different potentials;
• and
• the display substrate comprises a base plate, and orthographic projections of the second electrodes of the first transistors in the pixel circuits in any two adjacent rows on a base plate of the display panel overlap with orthographic projections of the corresponding first initialization signal line and the corresponding second initialization signal line on the base plate, respectively.