Display panel and preparation method therefor and display device

A display device, comprising a display panel, wherein the display panel comprises:

• a base substrate;
• a first planarization layer located on one side of the base substrate;
• a first metal layer located on one side of the first planarization layer facing away from the base substrate;
• a photosensitive element located in a display region of the display panel;
• an etching stop layer located on one side of the first metal layer facing away from the base substrate;
• and
• a light-emitting element located on one side of the photosensitive element facing away from the base substrate;
• wherein the photosensitive element comprises a first electrode and a semiconductor layer, the first electrode is located in the first metal layer, and the semiconductor layer is located on one side of the etching stop layer facing away from the first metal layer;
• in the display region, the etching stop layer comprises at least one first opening and at least one second opening;
• along a direction perpendicular to a plane where the base substrate is located, a first opening of the at least one first opening does not overlap with the first metal layer, an overlapping region exists among a second opening of the at least one second opening, the first electrode, and the semiconductor layer;
• and the first electrode and the semiconductor layer are connected to each other through the second opening.