Array substrate of easily-placed light-emitting elements, method of fabricating same, and display panel using same

A method of fabricating a light-emitting array substrate, comprising:

• providing a substrate;
• forming an insulating layer on the substrate, wherein the insulating layer comprises a first surface and a second surface opposed to the first surface, and the first surface is closer to the substrate than the second surface;
• forming a plurality of positioning holes on the insulating layer, wherein each of the plurality of positioning holes penetrates the first surface and the second surface, and each of the plurality of positioning holes comprises a first opening formed in the first surface and a second opening formed in the second surface, and for each of the plurality of positioning holes, a size of the first opening is less than a size of the second opening, and along a thickness direction of the substrate, a projection of the second opening on the substrate completely covers a projection of the first opening on the substrate;
• and
• transferring a plurality of light-emitting diodes on the substrate by a Fluid self-assembly process, wherein each of the plurality of light-emitting diodes is in one of the plurality of positioning holes and comprises an electrode electrically connected to the substrate and a navigation post opposite to the electrode and on a side of the electrode away from the substrate.

A display panel, comprising:

• a light-emitting array substrate, and
• an optical function layer on the light-emitting array substrate;
• wherein the light-emitting array substrate comprises:
• a substrate;
• an insulating layer on the substrate, the insulating layer comprising a first surface and a second surface opposed to the first surface, the first surface being closer to the substrate than the second surface, the insulating layer comprising a plurality of positioning holes penetrating the first surface and the second surface, and each of the plurality of positioning holes comprising a first opening formed in the first surface and a second opening formed in the second surface;
• and
• a plurality of light-emitting diodes, each of the plurality of light-emitting diodes being in one of the plurality of positioning holes and comprising an electrode electrically connected to the substrate and a navigation post opposite to the electrode and on a side of the electrode away from the substrate;
• wherein, for each of the plurality of positioning holes, a size of the first opening is less than a size of the second opening, and along a thickness direction of the substrate, a projection of the second opening on the substrate completely covers a projection of the first opening on the substrate.