Patent ID: 7649315

Claim:
A plasma display panel comprising: a first substrate and a second substrate that are disposed substantially in parallel with each other with a predetermined distance therebetween; a plurality of address electrodes disposed on the first substrate; a first dielectric layer disposed on a surface of the first substrate while covering the address electrodes; a plurality of barrier ribs having a predetermined height from the first dielectric layer and disposed in a space between the first substrate and the second substrate; a phosphor layer disposed in the discharge spaces; a plurality of display electrodes disposed on one side of the second substrate facing the first substrate in a direction crossing the address electrodes; a second dielectric layer disposed on a surface of the second substrate to cover the display electrodes; and a protective layer disposed to cover the second dielectric layer, wherein the protective layer comprises MgO having a crystalline grain diameter from about 100 to about 500 nm and a membrane density of less than or equal to about 3.3 g/cm 3 wherein the MgO protective layer has a single crystal structure.