Display panel, manufacturing method thereof, and electronic device

A method of manufacturing a display panel, comprising:

• providing a substrate, the substrate comprises a base substrate and a thin film transistor array layer positioned on the substrate, wherein the thin film transistor array layer comprises an auxiliary cathode, a signal trace, and a passivation protection layer, wherein the auxiliary cathode is disposed between the signal trace and the base substrate, and electrically connected to the signal trace, wherein the passivation protection layer is disposed on a side of the signal trace away from the base substrate;
• etching the passivation protection layer to form an opening penetrating through the passivation protection layer, wherein the opening exposes part of the signal trace, and wherein a width of the opening gradually decreases from a side away from the base substrate to a side close to the base substrate;
• forming a metal spacer on the signal trace at the opening;
• forming a planarization layer on the passivation protection layer, and etching the planarization layer to expose an upper surface of the metal spacer;
• etching the passivation protection layer around the metal spacer to expose a side edge of the metal spacer;
• forming an anode and a pixel definition layer in sequence on the passivation protection layer, and etching the pixel definition layer to expose the upper surface and the side edge of the metal spacer;
• depositing an organic functional layer on the pixel definition layer, wherein a portion of the organic functional layer deposited and formed on the metal spacer is disconnected from other portions, and wherein the side edge of the metal spacer is exposed;
• depositing a cathode on the organic functional layer, wherein the cathode is connected to the side edge of the metal spacer.

An electronic device, comprising a casing, a circuit board, and a display panel, wherein the circuit board is disposed in the casing, the display panel is covered on the casing, and the display panel is electrically connected to the circuit board, wherein the display panel comprises

• a base substrate;
• an auxiliary cathode on the base substrate;
• an anode on the base substrate;
• a metal spacer on the base substrate;
• and
• an organic functional layer and a cathode sequentially stacked on the anode and the metal spacer;
• wherein the metal spacer is electrically connected to the auxiliary cathode, wherein a part of the organic functional layer on the metal spacer is disconnected from other parts of the organic functional layer, wherein a side edge of the metal spacer is exposed, and wherein the cathode is connected to the side edge of the metal spacer.