A Plasma Display Panel enabling optimization of a process to apply phosphor paste in order to achieve mass production using a jet nozzle method includes dummy areas structured to determine whether application conditions such as an ejecting pressure or the like are stable by measuring a depth of the applied layer after applying phosphor paste at a portion thereof in advance. The casing is configured to conduct a mixture of a liquid and a contaminant through the cavity from the front end to the rear end. Several different types of light emitting diodes are provided, each emitting light in a different wave length portion. A plurality of hydraulic pistons are carried by the second structure and engage the first structure, so that alignment of the second structure relative to the first structure is adjustable by extending and retracting the hydraulic pistons.