Display substrate, manufacturing method thereof, and display device

A method of manufacturing a display substrate, comprising forming a scan driving circuit on a base substrate;

• wherein the scan driving circuit includes a plurality of shift register units, and at least one shift register unit of the plurality of shift register units includes an output circuit;
• the output circuit includes an first switch and an second switch;
• the method of manufacturing the display substrate further includes:
• forming a semiconductor layer on the base substrate, and performing a patterning process on the semiconductor layer to form an active layer of the first switch and an active layer of the second switch;
• the active layer of the first switch and the active layer of the second switch are arranged along a first direction, a length of the active layer of the first switch in the first direction is a first length, and a length of the active layer of the second switch in the first direction is a second length, and a sum of the first length and the second length is an output active length;
• a smaller one of a minimum width of the active layer of the first switch in a second direction and a minimum width of the active layer of the second switch in the second direction is a first output active width;
• the first direction intersects the second direction;
• a ratio of the output active length to the first output active width is within a first predetermined ratio range;
• the first predetermined ratio range is greater than or equal to 3 and less than or equal to 11.