Guidewires and related methods for percutaneous crossing of an occlusion in a blood vessel are disclosed. The method of fabricating an LCD includes providing assembled mother substrates, wherein at least one of the mother substrates includes a polarizer, a buffer layer, and a transparent film sequentially stacked on an out-side thereof, and fabricating the assembled mother substrates as individual units by cutting the assembled mother substrates into unit cells. In one aspect, the method also includes providing and placing a headband over the oximetry sensor, or alternately, the sensor is a headband-integrated sensor. This allows a semiconductor device having at least one type of conductor film selected from among a ruthenium film, a ruthenium oxide film, an osmium film, and an osmium oxide film to be manufactured inexpensively and at a high level of quality.