Direct backlight modules using diffraction optical elements are provided. On the basis of the detection result, sensor identification unit determining device determines an identifying unit that matches the environmental state. The plate has a modified x shape including a central trunk portion including one or more screw holes along a longitudinal axis and a set of divergent upper and an oppositely extending set of divergent lower arms, each arm including screw holes which are placed at a radially equal distance but which diverging asymmetrically from the longitudinal axis relative to its paired upper or lower mate.