The effective secondary electron emission coefficient (SEEC) in a plasma di
splay panel (PDP) is estimated by comparing the Paschen breakdown curves fr
om simulations with the experiment. It is found that the effective SEEC in
PDP is dependent on the ratio of electric field to pressure. The estimated
values are 0.59 similar to0.79 for the pure Ne and 0.1 similar to0.13 for t
he Ne-Xe (96/4) mixture, respectively.