Array substrate, manufacturing method thereof, and display apparatus

An array substrate, comprising:

• a substrate, comprising a main via hole, the main via hole filled with a first conductive material;
• a pixel circuit layer on a first surface of the substrate, the pixel circuit layer comprising a first via hole corresponding to the main via hole, an orthographic projection of the first via hole on the substrate at least partially overlapping the corresponding main via hole, and the first via hole filled with a second conductive material;
• wherein the pixel circuit layer comprises a pixel circuit electrically connected to the first conductive material through the second conductive material in the first via hole.
• wherein the array substrate further comprises a connecting circuit layer and a protective layer covering the connecting circuit layer on a second surface opposite from the first surface of the substrate;
• the connecting circuit layer and the protective layer comprising a second via hole corresponding to the main via hole, the second via hole penetrating through the connecting circuit layer and the protective layer, and an orthographic projection of the second via hole on the substrate at least partially overlapping the corresponding main via hole;
• wherein the second via hole exposes a terminal on a side of the connecting circuit layer, and the second via hole is filled with a third conductive material, and the terminal on the side of the connecting circuit layer is electrically connected to the first conductive material through the third conductive material.