A swing arm support structure is provided in a motorcycle, in which first and second support arm portions are provided on a front portion of a swing arm. A fan dissipates heat generated from the plasma display panel and components inside of the apparatus. Also included are a light source driver which receives the controlled current from the converting unit and converts the current into a pulse current to drive a light source and a pulse signal generator which generates a pulse signal to be applied to the light source driver. The same technique is also valuable in monochrome systems as an aid to overcoming edge displacement and slow toner problems when the selective edge softening is selectively applied to edges which are in particular perpendicular to the fast scan direction. The deflection ridge encompasses a partial circumference of the nozzle.