Investigation of the outgassing characteristics of the materials comprising a plasma display panel

Abstract

Long gas evacuation time before the introduction of the discharge gases into the panel is one of the major problems in the production of a plasma display panel ͑PDP͒. In this study, the outgassing characteristics during the panel evacuation stage were investigated using a quadrupole mass spectrometer. The origin of the impurity gas was studied by measuring the outgassed species from each layer comprising the PDP. Dominant species observed during the evacuation of the panel were H 2 , H 2 O, N 2 , O 2 , and CO 2 and water vapor was the most abundant species. When the outgassing characteristics of the panel were compared with the outgassing characteristics from each layer comprising the panel, the material most responsible for the water vapor turned out to be a MgO layer. The outgassing experiments of single panels have also shown that the long outgassing time of PDP is mostly related to the MgO layer and possibly also to red, green, and blue layers and white dielectric material coated on the each single panel. Therefore to reduce the gas evacuation time, controlled atmosphere appears to be required during the deposition of these materials and the storage of those deposited panels.

23.3: Surface Fluorination of MgO Protective Film to Reduce Chemical Reactivity with H2O and CO2

“…Previous studies have revealed that impurity gases, such as H 2 O and CO 2 , degrade the discharge characteristics of a panel [1], and the dominant origin of these gas species is MgO among the several materials comprising the PDPs at the panel evacuation stage [2]. Here, MgO has an extremely strong chemical reactivity itself, so that a deactivation reaction with H 2 O and CO 2 molecules occurs readily in air.…”