A backplate for a rear surface of a display comprises a backplate main body and a stiffener assembly disposed on the surface of the backplate main body, the stiffener assembly comprises a first inclined rib extending from each corner of the backplate main body toward the center and a second inclined rib surrounding triangle areas with every corners; wherein, the first inclined rib sets up a cross relative to the nearest second inclined rib. The surface of the backplate main body comprises a stiffener assembly with a plurality of stiffener ribs, a first inclined rib extending from each corner toward the center, and a second inclined rib disposed at every corners.