Patent ID: 7122963

Claim:
A plasma display device comprising: a front substrate; a back substrate opposed to said front substrate so as to form a discharge space between said front substrate and said back substrate; a plurality of barrier ribs provided in said discharge space so as to partition said discharge space; a plurality of display electrodes disposed on said front substrate so as to form a plurality of discharge cells between said barrier ribs; a dielectric layer disposed above said front substrate so as to cover said display electrodes; and a phosphor layer which emits light by discharge between said display electrodes, wherein said dielectric layer is constructed of at least two layers of different permittivities, said at least two layers comprising an upper layer and a lower layer, wherein said upper layer of said dielectric layer is disposed so as to be closer to said discharge space than said lower layer, wherein said lower layer of said dielectric layer is disposed so as to cover said display electrodes, wherein a permittivity of said upper layer of said dielectric layer is smaller than a permittivity of said lower layer of said dielectric layer, wherein, in each of said discharge cells, said upper layer of said dielectric layer is formed with a substantially square shaped recessed part, and wherein said substantially square shaped recessed part is formed with corner portions thereof that are rounded.