A display device comprising a middle frame and a back cover , a plurality of limiting screws and a fixing screw, the back cover comprising a plurality of limiting screw through holes and a fixing screw through hole , the plurality of limiting screw through holes are arranged at intervals along an edge of the back cover of the display device, and the fixing screw through hole is located closer to the middle of the back cover of display device relative to the limiting screw through hole ; wherein the back cover is connected with the middle frame by the fixing screw which is installed in the fixing screw through hole to fix the back cover together with the middle frame , wherein the diameter of the fixing through hole equals the diameter of the screw rod of the fixing screw, wherein the diameter (d 2 ) of each limiting screw through hole is larger than the diameter (d 3 ) of the screw rod of each limiting screw , wherein the middle frame of the display device has a plurality of screw holes corresponding to the limiting screw through holes in the back cover of the display device, wherein each limiting screw is installed in and passes through a respective limiting screw through hole to be fixed in a corresponding screw hole in the middle frame thereby limiting a potential deformation to the edge of the back cover ; wherein the diameter (d 10 ) of each screw hole in the middle frame is equal to the diameter (d 3 ) of the screw rod of each limiting screw ; the sum of the depth (L 1 ) of each limiting screw through hole in the back cover and the depth (L 2 ) of the corresponding screw hole in the middle frame is smaller than the length (L 3 ) of the respective screw rod of the limiting screw . the back cover comprising a plurality of limiting screw through holes and a fixing screw through hole , the plurality of limiting screw through holes are arranged at intervals along an edge of the back cover of the display device, and the fixing screw through hole is located closer to the middle of the back cover of display device relative to the limiting screw through hole ; wherein the back cover is connected with the middle frame by the fixing screw which is installed in the fixing screw through hole to fix the back cover together with the middle frame , wherein the diameter of the fixing through hole equals the diameter of the screw rod of the fixing screw, wherein the diameter (d 2 ) of each limiting screw through hole is larger than the diameter (d 3 ) of the screw rod of each limiting screw , wherein the middle frame of the display device has a plurality of screw holes corresponding to the limiting screw through holes in the back cover of the display device, wherein each limiting screw is installed in and passes through a respective limiting screw through hole to be fixed in a corresponding screw hole in the middle frame thereby limiting a potential deformation to the edge of the back cover ; wherein the diameter (d 10 ) of each screw hole in the middle frame is equal to the diameter (d 3 ) of the screw rod of each limiting screw ; the sum of the depth (L 1 ) of each limiting screw through hole in the back cover and the depth (L 2 ) of the corresponding screw hole in the middle frame is smaller than the length (L 3 ) of the respective screw rod of the limiting screw . <EOS>