A single substrate AC andor DC gas discharge display device with hollow shells containing ionizable gas at a predetermined pressure, each shell being positioned on the surface of the substrate or within a substrate cavity, well, or hollow. A wire comb is mounted adjacent one or more ends of the circuit board to permit a way to space apart individual wires, to hold them in place; and to permit welding or soldering of the wires to the appropriate connections or the circuit board during an overmolding process. Injection of a diluent during the cell concentrate removal process permits more complete removal of viscous cell concentrates.