US Patent 7166962 Plasma display panel with improved brightness and contrast

Disclosed is a plasma display panel comprises a lower substrate and an upper substrate, spaced apart by a predetermined distance to define a discharge space therebetween; a plurality of barrier ribs between the lower substrate and the upper substrate, partitioning the discharge space to form a plurality of discharge cells; a plurality of address electrodes formed in parallel on the upper surface of the lower substrate; a plurality of discharge electrodes formed at an angle to the address electrodes on the lower surface of the upper substrate; a fluorescent layer formed on the inner walls of the discharge cells; and an external light shielding member formed on the upper substrate, preventing external light from entering the discharge cells, wherein the lower surface of the upper substrate has a plurality of cylindrical lenses, corresponding to each of the discharge cells.