Pixel Circuit, Driving Method Therefor, Display Substrate, and Display Apparatus

A pixel circuit configured to drive a light emitting device to emit light, comprising:

• a node control sub-circuit, a storage sub-circuit, a driving sub-circuit, and a light emitting control sub-circuit;
• the node control sub-circuit is electrically connected to a first node, a second node, a third node, a fourth node, a first scanning signal line, a second scanning signal line, a first initial signal line, a second initial signal line, a reset signal line, a data signal line and a first power supply line respectively, and is configured to provide a signal of the first initial signal line or the third node to the first node, provide a signal of the second initial signal line to the fourth node and provide a signal of the data signal line to the second node under control of the reset signal line, the first scanning signal line and the second scanning signal line;
• the storage sub-circuit is electrically connected to the second node and the first power supply line respectively, and is configured to charge the second node when a signal of the first scanning signal line is an effective level signal;
• the driving sub-circuit is connected to the first node, the second node, and the third node respectively, and is configured to provide a drive current to the third node under control of the first node and the second node;
• the light emitting control sub-circuit is electrically connected to a light emitting signal line, the first power supply line, the second node, the third node, and the fourth node respectively, and is configured to provide a signal of the first power supply line to the second node and provide the signal of the third node to the fourth node under control of the light emitting signal line;
• and
• a first electrode of the light emitting device is connected to the fourth node, and a second electrode of the light emitting device is connected to a second power supply line.