Abstract: A method for manufacturing a display panel substrate has the steps of flowing a working gas along and out of a slit defined between two sputtering targets of Mg and toward the substrate thereby selecting the purity of the Mg material of the targets to be at least 99% and thereby blowing sputtered-off material out of the slit and toward the substrate. Introduction, in an area between the slit and the substrate, of a reactive gas containing oxygen, follows, and reacting the sputtered-off material with the reactive gas results in depositing on the substrate, an MgO layer. The method also includes setting the temperature of the substrate during the coating process.

Abstract: A method and apparatus for producing a substrate which is coated with a Mgo-layer, includes a pair of Mg targets which define a slit and which have a target purity of at least 99 percent. A working gas flows along the slit. Oxygen is provided in an area between the slit and the substrate to be coated. The temperature of the substrate is set by heating or cooling the substrate during the coating process.