The invention provides a sensing method which is applicable to a display module, wherein the display module comprises a display panel and a light source; the display panel is arranged on the light source, and the display panel has a plurality of pixels and a plurality of optical sensing components; and the optical sensing components are arranged inside one pixel. The sensing method of the displaymodule is to start at least one optical sensing component and the corresponding pixel at one time, and to close part of the pixels adjacent to the optical sensing components so that the optical sensing component can gradually sense a reflected light of the light source.