The invention provides a method for eliminating black edges, a display device and a detection device. The display device comprises a cover plate and a display panel which are staggeredly arranged, thecover plate comprises a visible area and a non-visible area located on the periphery of the visible area, the display panel comprises a display area corresponding to the visible area, and the displayarea includes a first display area body located in the middle of the display panel and a second display area body located on the periphery of the first display area body; the size of the display areaof the display panel is greater than that the visible area of the cover plate, and pixels of at least one side of the second display area body display the same color as the non-visible area, so thatthe size of the first display area body is smaller than that of the visible area. By utilizing pixels at the boundary of the display area to block black matrices between a peripheral area and the first display area body, the black edges are eliminated, and the display effect is improved.