Display substrate and preparation method thereof, and display apparatus

A display substrate, comprising:

• a plurality of display units,
• wherein a display unit of the plurality of display units comprises a display area and a transparent area, the display area comprises a plurality of sub-pixels;
• in a direction perpendicular to the display substrate, a sub-pixel comprises a first metal layer, a semiconductor layer, a second metal layer and a third metal layer which are arranged on the substrate, the first metal layer comprises a first plate, the semiconductor layer comprises a second plate, the second metal layer comprises a first scanning line and a second scanning line which define a sub-pixel row, and the third metal layer comprises a third plate, and a first power supply line, a second power supply line, a compensation line and data lines which define the plurality of sub-pixels;
• there is an overlapping area between an orthographic projection of the second plate on the substrate and an orthographic projection of the first plate on the substrate to form a first storage capacitor, there is an overlapping area between an orthographic projection of the third plate on the substrate and the orthographic projection of the second plate on the substrate to form a second storage capacitor, the third plate is connected with the first plate through a via hole;
• and the third metal layer further comprises at least one auxiliary cathode which is arranged in the transparent area and connected with the second power supply line.