Flat display panel and method of manufacturing same

A method of manufacturing flat display panels, comprising the steps of:

• horizontally supporting the panel, including two substrates facing each other at a required interval, with one of the substrates, having a ventilation hole formed therein to provide communication between the exterior and a space defined between the two substrates, facing downward;
• preparing a ventilation duct having a flange formed at one end, and a sealing member having a central hole;
• placing the sealing member in a position connecting the central hole with the ventilation hole opening on the underside of the substrate to sandwich the sealing member between the flange and the underside of the substrate and to align the ventilation duct approximately coaxially with the ventilation hole;
• and
• heating the sealing member sandwiched between the flange of the ventilation duct and the underside of the substrate to fuse the sealing member to the flange of the ventilation duct and the underside of the substrate for securing the ventilation duct to the underside of the substrate.