A non-destructive in-situ elemental profiling of a layer in a set of layers method and system are disclosed. The incident face of the light guide element is disposed so as to overlap a portion 32 of a peripheral display region adjoining the frame region of the display panel along the first axis, and be parallel to the surface of the display panel. The random propylene copolymer is produced through metallocene-catalyzed and Z-N polymerization and includes from 80 wt. A spring is positioned on the wedge unit for constantly biasing the wedge unit against the wedge-receiving space. The updated number of rewritings is transferred to a corresponding number of EW times storage section, in parallel to data rewriting to a memory cell. The powering unit has another secondary winding, another bridge-type rectifier circuit and another discharge circuit operable to trigger the output circuit with part of the output direct current voltage via the output choke coil and the output capacitor.