The invention concerns a procedure and a machinery for molding and assembling of at least two part objects and of plastics, e. The backlight arranged on a back surface of a liquid crystal panel includes a light guide plate, a light source, a first asymmetrical prism sheet, and a second asymmetrical prism sheet. The second device mimics the power state of the first device. The sensor target is coupled to the linkage structure and is movable therewith.