Realization of High Luminous Efficacy at Low Voltages in the Plasma Display Panel With SrO–MgO Double Layer

We have applied a double protecting layer consisting of SrO and MgO to a plasma display panel. The top MgO layer protects the underlying SrO from contamination by H₂O or CO₂ when exposed to air and enables it to function as the main cathode material after the aging process, which partially removes the MgO layer. We have confirmed that the adoption of a double SrO-MgO layer results in a considerable reduction in driving voltage and improvement in luminous efficacy simultaneously.