Display substrate and manufacturing method thereof, display device

A display substrate, comprising:

• a base substrate, and
• a plurality of sub-pixels on the base substrate,
• wherein the plurality of sub-pixels are arranged in a plurality of sub-pixel columns in a first direction and a plurality of sub-pixel rows in a second direction, the first direction intersecting with the second direction,
• at least one of the plurality of sub-pixels comprises a first transistor, a second transistor, a third transistor, and a storage capacitor on the base substrate,
• a first electrode of the second transistor is electrically connected to the first capacitor electrode of the storage capacitor and a gate electrode of the first transistor, a second electrode of the second transistor is configured to receive a data signal, a gate electrode of the second transistor is configured to receive a first control signal, the second transistor is configured to write the data signal to the gate electrode of the first transistor and the storage capacitor in response to the first control signal,
• a first electrode of the first transistor is electrically connected to a second capacitor electrode of the storage capacitor and configured to be electrically connected to a light emitting element, a second electrode of the first transistor is configured to receive a first power voltage, the first transistor is configured to control a current for driving the light emitting element under control of a voltage of the gate electrode of the first transistor,
• a first electrode of the third transistor is electrically connected with the first electrode of the first transistor and a second capacitor electrode of the storage capacitor, a second electrode of the third transistor is configured to be connected with a detection circuit, a gate electrode of the third transistor is configured to receive a second control signal, and the third transistor is configured to detect an electrical characteristic of the sub-pixel to which the third transistor belongs by the detection circuit in response to the second control signal;
• the second capacitor electrode and the first electrode of the second transistor are in a same layer and made of a same material, and are insulated from each other;
• the display substrate further comprises an extension portion protruding from the gate electrode of the first transistor, and the extension portion is extended from the gate electrode of the first transistor in the second direction;
• the extension portion is at least partially overlapped with the first electrode of the second transistor in a direction perpendicular to the base substrate and is electrically connected with the first electrode of the second transistor;
• in the first direction, the gate electrode of the first transistor has a first side closest to the second capacitor electrode, the extension portion has a second side closest to the second capacitor electrode, and the second side is recessed in a direction away from the second capacitor electrode with respect to the first side.