Array substrate, method for controlling the same, and display device

An array substrate, comprising:

• a base substrate;
• and
• an array of first thin film transistors, a signal line array, a photosensor array and a receiving line array, each provided on the base substrate,
• wherein
• each first thin film transistor in the array of first thin film transistors is connected to one signal line in the signal line array,
• each photosensor in the photosensor array is connected to one signal line in the signal line array and one receiving line in the receiving line array, and
• lenses are provided on at least one photosensor in the photosensor array on a side thereof away from the base substrate, so as to form a lens array,
• each photosensor in the photosensor array comprises a second thin film transistor and a photoelectric converter, wherein the second thin film transistor has a gate connected to the signal line and a negative electrode of the photoelectric converter, a first electrode connected to a positive electrode of the photoelectric converter, and a second electrode connected to the receiving line,
• the second thin film transistor comprises an active layer,
• the base substrate has a base layer, the active layer, a first insulating layer, a second insulating layer and a third insulating layer provided thereon in an order from bottom to top, wherein the first insulating layer and the second insulating layer have a first via hole provided therein, the second insulating layer has a second via hole provided therein, the first insulating layer, the second insulating layer, and the third insulating layer have a third via hole provided therein, and orthogonal ections of the first via hole, the second via hole and the third via hole on the base substrate are ail within a range of an orthogonal projection of the active layer on the base substrate,
• the gate is provided in the second via hole, and the photoelectric converter is provided on the gate,
• the first electrode is provided on the second insulating layer and is electrically connected to the active layer through the first via hole,
• the second electrode is provided in the third via hole and is electrically connected to the active layer, and
• the receiving line is provided on the third insulating layer and is electrically connected to the second electrode through the third via hole, wherein the receiving line and the second electrode are formed by the same patterning process.