The present invention relates to a plasma display panel driving method and apparatus for reducing subfield position variation between display frames by arranging an idle period among the subfields. Also disclosed is the method for coloring a substrate, a colored surface of a porous substrate and a process for producing such a composition. In addition, embodiments may include a tracheal tube with sensors configured to sense a buildup of secretions. The continuous tone image of the pattern to be measured is binarized on the basis of the set threshold. Once secured, the snap lid presses against a peripheral region of an exterior surface of the window. The capacitor and inductor provide a resonant time period and are connected in series with the switch and the diode.