Frame-free display device and joint-free large-screen splicing display system

The invention discloses a frame-free display device and a joint-free large-screen splicing display system, and relates to the technical field of large-screen splicing display. The frame-free display device comprises a display screen with a frame, and the display area of the display screen includes a central area and fringe areas between the central area and the frame. An optical transparent panel covers in front of a central-area watching surface, and eccentric linear Fresnel lenses cover in the front of fringe-area watching surfaces. The Fresnel center line of each eccentric linear Fresnel lens is near to one side of the central area. The eccentric linear Fresnel lenses used for amplifying the fringe areas are arranged in front of the fringe areas of the display screen with the frame, and the amplified fringe areas are larger than or equal to the frame and completely cover the frame, so that the frame of the display device is eliminated visually.