Display panel and manufacturing method thereof, and display device

A display panel, comprising a display area and a non-display area, wherein the display area comprises a first display area and a second display area both bendable in relation to each other to enable a folded state or an expanded state of the display panel, wherein in the folded state, the first display area and the second display area are bent toward each other, and wherein in the expanded state, the first display area and the second display area are bent away from each other, and the display panel comprising:

• a base substrate;
• a thin-film transistor layer disposed on a surface of the base substrate, wherein the thin-film transistor layer in the first display area is provided with a through hole extending through the thin-film transistor layer, or a side of the thin-film transistor layer away from the base substrate in the first display area is provided with a groove;
• and
• a distance sensor disposed inside the base substrate in the first display area and located away from the through hole or the groove, and comprising an emitting surface and a receiving surface both disposed facing the through hole or the groove, wherein the emitting surface is configured to emit infrared light passing through the through hole or the groove for formation of a first light signal and a second light signal, and the receiving surface is configured to receive the first light signal or the second light signal through the through hole or the groove, wherein the distance sensor detects a change of distance between the distance sensor and the second display area, wherein in the expanded state, the first light signal is not blocked by the display panel causing the change of distance to increase, and wherein in the folded state, the first light signal is blocked by the display panel causing the change of distance to decrease.