Flat panel detector and display device

A flat panel detector, comprising a base substrate and a plurality of detection regions arranged in an array on the base substrate, wherein each of the detection regions is successively provided with a photosensitive sensor and an optical structure along a direction away from the base substrate;

• the optical structure comprises a condensing unit and a light filtering unit, wherein the condensing unit is used for receiving near-infrared light emitted by a laser light source and ambient light and performing light condensing and the light filtering unit is configured to shield the ambient light and transmit the near-infrared light;
• the photosensitive sensor comprises an amorphous silicon photodiode and a thin film transistor, wherein the amorphous silicon photodiode is configured to convert the near-infrared light transmitted by the light filtering unit into an electrical signal, and the thin film transistor is configured to output the electrical signal to a reading signal line;
• and
• an orthographic projection of the optical structure on the base substrate completely covers the orthographic projection of the photosensitive sensor on the base substrate;
• an area of an orthographic projection of the light filtering unit onto the base substrate is smaller than an area of an orthographic projection of condensing unit onto the base substrate, and an area of an orthographic projection of the photosensitive sensor onto the base substrate is smaller than the area of the orthographic projection of the light filtering unit onto the base substrate.