Provided are a backlight assembly with improved heat dissipation, and a liquid crystal display having such a backlight assembly. The device makes use of an array of retaining whiskers at the open end of the device to capture and retain hockey pucks. The semiconductor die includes an active surface with a plurality of die contact pads electrically connected by conducting means to contact pads on the substrate and a layer of first adhesive means on the upper surface of the die. The system further includes a control device controlling the lighting device of the case. In an aspect, the battery pack validates the cordless device or charger to which it is mated in an aspect of the invention, the cordless system uses any of a wired interface, radio frequency interface, an optical interface or a magnetic interface to communicate information between the battery pack and the cordless device or charger to which the battery pack is mated. These compounds are useful in a variety of applications including the PEGylation of biologically active molecules.