Display substrate and display device

A display substrate, comprising:

• a display region and a non-display region, wherein the display substrate comprises:
• a substrate, and a first power supply line, a scanning signal line, a first initial signal line and a plurality of display units disposed on a substrate;
• the display units are located in the display region, and the first power supply line is located in the non-display region;
• a display unit comprises:
• a drive structure layer and a light-emitting structure layer;
• the light-emitting structure layer comprises:
• a light-emitting element, and the drive structure layer comprises:
• a pixel drive circuit configured to drive the light-emitting element to emit light;
• the pixel drive circuit comprises:
• a reset sub-circuit, connected with the scanning signal line, the first initial signal line and a first electrode of the light-emitting element respectively, and configured to provide a signal of the first initial signal line to the first electrode of the light-emitting element under control of a signal of the scanning signal line to initialize the first electrode of the light-emitting element;
• and a second electrode of the light-emitting element is connected with the first power supply line;
• and
• the first initial signal line is electrically connected with the first power supply line;
• wherein the scanning signal line comprises:
• a first scanning signal line and a second scanning signal line disposed in parallel;
• the display substrate also comprises:
• a second power supply line, a light-emitting signal line, a data signal line and a second initial signal line;
• the pixel drive circuit further comprises:
• a drive control sub-circuit, a drive sub-circuit and a light-emitting control sub-circuit;
• the reset sub-circuit comprises:
• a first transistor;
• the drive control sub-circuit comprises:
• a storage capacitor, second to fourth transistors;
• the drive sub-circuit comprises:
• a drive transistor;
• and the light-emitting control sub-circuit comprises a fifth transistor and a sixth transistor;
• the drive structure layer comprises:
• a first insulating layer, a semiconductor layer, a second insulating layer, a first metal layer, a third insulating layer, a second metal layer, a fourth insulating layer, and a third metal layer which are sequentially stacked on the substrate;
• and
• the semiconductor layer comprises:
• an active layer of all transistors in the pixel drive circuit the first metal layer comprises:
• the first scanning signal line, the second scanning signal line, the light-emitting signal line and control electrodes of all transistors in the pixel drive circuit the second metal layer comprises:
• the first initial signal line and the second initial signal line;
• the third metal layer comprises:
• the first power supply line, the second power supply line, the data signal line and the first and second electrodes of all transistors in the pixel drive circuit.