Array substrate, display panel, display device, and wearable device

An array substrate, wherein a near field communication antenna is arranged in conductive layers of the array substrate, and the near field communication antenna comprises:

• a main coil and a secondary coil, wherein:
• the main coil and the secondary coil are located in different conductive layers of the array substrate, and
• a first terminal of the main coil is electrically connected to a first terminal of the secondary coil through a first via hole of the array substrate, and a second terminal of the main coil is electrically connected to a second terminal of the secondary coil through another first via hole of the array substrate;
• and
• wherein the array substrate comprises a glass substrate, a buffer layer, a gate insulating layer, a gate layer, an interlayer insulating layer, a source-drain layer, and a passivation layer, which are sequentially stacked, wherein:
• the conductive layers of the array substrate comprise the gate layer and the source-drain layer;
• the main coil of the near field communication antenna in the array substrate is located in the gate layer;
• and/or
• the secondary coil of the near field communication antenna is located in the source-drain layer.