Display substrate comprising a pixel driving circuit having a compensation sub-circuit and operating method therefor, and display apparatus

A display substrate comprising a plurality of pixel driving circuits and a plurality of light emitting elements respectively connected with the plurality of pixel driving circuits, the plurality of pixel driving circuits being configured to drive the plurality of light emitting elements to emit light, and at least one pixel driving circuit comprising a first reset sub-circuit, a compensation sub-circuit, a writing sub-circuit, a second reset sub-circuit, a driving sub-circuit, and a light emitting sub-circuit, and the driving sub-circuit comprising a driving transistor, wherein:

• the first reset sub-circuit is connected with an initial signal line, a second node and a first scan signal line respectively, and is configured to write an initial signal of the initial signal line to the second node under control of the first scan signal line;
• the compensation sub-circuit is connected with a first power supply line, the first scan signal line, a first node, the second node, and a third node respectively, and is configured to supply a signal of the third node to the first node in a reset stage under control of the first scan signal line, wherein a time for which the signal of the third node is supplied to the first node in a threshold compensation stage is adjustable until a signal of the first node is capable of meeting a threshold condition;
• the writing sub-circuit is connected with a fourth scan signal line, a data signal line, and the first node respectively, and is configured to, under control of the fourth scan signal line, write a data signal of the data signal line to the first node;
• and couple a signal of the first node to the second node in a data writing stage to enable a signal of the second node to meet the threshold condition;
• the second reset sub-circuit is connected with the initial signal line, a second scan signal line, and a first electrode of a light emitting element respectively, and is configured to, under control of the second scan signal line, write the initial signal of the initial signal line to the first electrode of the light emitting element, and write the initial signal of the initial signal line to the third node via the light emitting sub-circuit and the driving sub-circuit in the threshold compensation stage, supply a potential of the third node to the first node via the compensation sub-circuit, and charge a difference between an initial voltage output by the initial signal line and a threshold voltage of the driving transistor into the first node;
• the driving sub-circuit is connected with the second node, the third node and a fourth node respectively, and is configured to supply a driving current to the fourth node according to signals of the second node and the third node;
• and
• the light emitting sub-circuit is connected with the first power supply line, the third node, the fourth node, a first light emitting signal line, a second light emitting signal line, and the first electrode of the light emitting element respectively, and is configured to write a signal of the first power supply line to the third node under control of the first light emitting signal line, and write a signal of the fourth node to the first electrode of the light emitting element under control of the second light emitting signal line.