Abstract
The effects of the base vacuum level on the electrical and optical characteristics of a plasma display panel (PDP) were investigated. We found that the main impurity gases remaining inside a PDP panel during a pumping cycle consisted of $H_2O,\;CO_2,\;CO,\;N_2$, and $O_2$ that the amounts of these impurity gases rapidly decreased as the vacuum level was increased, especially near $10^{-5}$ Torr. After the pumping process, a discharge gas of Ne-Xe(4 %) was introduced inside the panel. The relationship between the luminous efficiency and the base vacuum level was analyzed. For a base vacuum level of $1{\times}10^{-4}$ Torr, the firing voltage of a 2-inch diagonal PDP panel was 232 V at a discharge gas pressure of 400 Torr, and the luminous efficiency was 1.5 lm/W for a 180 V sustaining pulse. However, for $1{\times}10^{-6}$ Torr, the firing voltage was reduced to 215 V, and the luminous efficiency was improved considerably to 2.5 lm/W. We successfully demonstrated the operation of a tipless PDP fabricated using a vacuum in-line sealing method.