Back plate assembly with variable curvatures and backlight unit thereof

A backlight unit, comprising a backlight module and a back plate component with variable curvatures, the back plate comprising a flexible back plate, a connecting component, and an adjustment mechanism, wherein the adjustment mechanism comprises a connecting shaft disposed on the flexible back plate, and the connecting component is coupled to the connecting shaft and abuts the flexible back plate, and the adjustment mechanism adjusts the connecting component on the connecting shaft to modulate a clamping force of the flexible back plate received from the connecting component;

• wherein a middle portion of the connecting component is coupled to the connecting shaft and two ends of the connecting component abut a back side of the flexible back plate, and the adjustment mechanism adjusts a position where the middle portion of the connecting component is located on the connecting shaft;
• wherein the connecting component comprises two connecting arms and a moving block, wherein the moving block is set on the connecting shaft and is movable along an axis of the connecting shaft;
• and each of the two connecting arms has a first end that is coupled to the moving block such that the two connecting arms define an included angle;
• and
• wherein the connecting shaft has a proximal end that is rotatably and directly mounted to the back side of the flexible back plate and an opposite, distal end that is in threading engagement with the moving block, and the adjustment mechanism comprises a driven module connecting to the connecting shaft and powering the connecting shaft to rotate so as to cause a movement of the moving block along the axis of the connecting shaft through the threading engagement between the distal end of the connecting shaft and the moving block, wherein the driven module is arranged between the back side of the flexible back plate and the moving block, such that the flexible back plate, the driven module, and the moving block are arranged in such an order in a direction defined by the axis of the connecting shaft and the driven module and the moving block are both arranged backward of the back side of the flexible back plate.