Patent ID: 6817917
Filing Date: 2004-11-16
Classification: H01J

Abstract:
In a plasma display panel manufacturing method for providing an improved plasma display pane with cells of phosphor layers including a blue phosphor layer with an improved chromaticity coordinate, the improvement comprising the steps of:forming a sealant layer, about a peripheral region of main surfaces of a front panel and a back panel facing each other to provide cells of phosphor layers, the sealant layer is arranged in contact with both the periphery of the front panel and back panel to provide a plurality of spaced open gaps about the periphery to provide egress to an open space containing the cells between the facing front panel and back panel; circulating a dry gas, wherein a partial pressure of steam included in the dry gas atmosphere is 130 Pa or lower, through the spaced open gaps to remove any absorbed gases from the manufacturing of the front panel and back panel; initially heating the entire facing front panel and back panel to release the absorbed gases while circulating the dry gas through the spaced open gaps; continuing the heating of the entire facing front panel and back panel at a temperature to soften the sealant layer sufficiently to gradually close the spaced open gaps while maintaining the circulation of the dry gas until the peripheral region is sealed wherein the chromaticity coordinate, y, in the CIE color specification of luminescent color of light emitted from only cells including the blue phosphor layer is 0.08 or lower; and moving the facing front and back panels with the sealant open gaps through an oven while directing dry gas through nozzles toward side peripheral regions including the spaced gaps as the spaced gaps are gradually closed by an application of pressure.