Display device and application method thereof

The invention provides a display device and an application method thereof, relates to the technical field of sensing, and aims to solve the problem that pulse monitoring equipment is inconvenient to carry. The display device comprises an array substrate, the array substrate comprises a substrate body and a plurality of sub-pixel areas distributed on the substrate body in an array mode, and in at least part of the sub-pixel areas, interval areas are arranged between the adjacent sub-pixel areas; a plurality of photosensitive modules arranged on the substrate, wherein the orthographic projection of each photosensitive module on the substrate is at least partially overlapped with the orthographic projection of the spacer region on the substrate; the processing module is arranged in the peripheral area of the substrate, and the processing module is coupled with the light sensing modules and used for receiving electric signals fed back by the light sensing modules and converting the electric signals into pulse sig