Display substrate and display device

A display substrate, comprising:

• a base substrate, and at least one low temperature poly-silicon thin film transistor and at least one metal oxide thin film transistor on the base substrate;
• the low temperature poly-silicon thin film transistor comprises:
• a low temperature poly-silicon semiconductor layer, a first gate insulating layer, a first gate electrode, a first interlayer insulating layer, a first source electrode, and a first drain electrode;
• the metal oxide thin film transistor comprises:
• a metal oxide semiconductor layer, a second gate insulating layer, a second gate electrode, a second interlayer insulating layer, a passivation layer, a second source electrode, and a second drain electrode;
• and
• the metal oxide semiconductor layer and the low temperature poly-silicon semiconductor layer are in different layers;
• the second source electrode is on a side of the metal oxide semiconductor layer close to the base substrate;
• and the second drain electrode is on a side of the metal oxide semiconductor layer away from the base substrate.