Patent ID: 7535178

Claim:
A plasma display panel, having a pair of substrates placed opposite each other on either side of a discharge space, discharge electrodes formed on one of the opposing substrates, and a dielectric layer covering the discharge electrodes, comprising: a protective layer that covers the dielectric layer and has a magnesium oxide layer including magnesium oxide single crystals having a particle diameter of 2000 or more angstroms that have a crystalline structure causing a cathode-luminescence emission having a peak within a wavelength range of 200 nm to 300 nm upon excitation by an electron beam; and a ternary discharge gas including neon, xenon and helium and filling the discharge space; wherein a concentration ratio of helium to neon in the ternary discharge gas ranges from 0.5 to 1.5, and wherein said magnesium oxide single crystals comprise randomly-oriented magnesium oxide single crystals.