A display panel features a backlight unit including a back plate, a light-guide with a first surface facing a display device and a second surface facing the back play, and a light-source mounted on a side of light-guide. An orthographic projection of the first surface coincides with the display device, an orthographic projection of second surface coincides with back plate, the first surface has an area larger than that of second surface such that first surface covers the light source. A plurality of the display panels might be placed adjacent to one another to form a display structure.