a substrate;

a driving circuit layer disposed on the substrate, wherein the driving circuit layer comprises an auxiliary electrode, the auxiliary electrode comprises a first conductive layer, a second conductive layer, and a third conductive layer that are stacked, the second conductive layer is disposed between the first conductive layer and the third conductive layer, the first conductive layer comprises a protrusion portion protruding from the second conductive layer, and the third conductive layer comprises an overhang portion protruding from the second conductive layer, wherein the overhang portion, a side surface of the second conductive layer, and the protrusion portion define an undercut space;

a first electrode disposed on the driving circuit layer;

a pixel definition layer disposed on the first electrode, and

a light-emitting layer and a second electrode, wherein the light-emitting layer is disposed on the first electrode, the second electrode is disposed on the light-emitting layer, the light-emitting layer is disconnected from the second electrode at the undercut space, and the second electrode extends into the undercut space and is connected to the protrusion portion;

wherein the driving circuit layer further comprises a protective layer and a planarization layer, the protective layer is disposed on the auxiliary electrode, and the planarization layer is disposed on the protective layer;

the driving circuit layer is provided with a connection via hole, and the connection via hole penetrates the planarization layer and the protective layer; and

the connection via hole exposes the auxiliary electrode, and a buffer space is defined between the first conductive layer and the connection via hole.