Patent ID: 6945838

Claim:
A knocking treatment method in a flat-type display device in which a first substrate provided with a first electrode and a second substrate provided with a second electrode are disposed with a vacuum space interposed between the first and second substrates and the first substrate and the second substrate are bonded to each other in their circumferential portions, said method comprising stepwise applying, a voltage V 1 to the first electrode higher than a voltage applied to the second electrode to remove a projection present in the first electrode by field evaporation; wherein after the first voltage-application step of applying the voltage V 1 to the first electrode higher than the voltage applied to the second electrode, a second voltage-application step of applying a voltage V 2 to the second electrode higher than the voltage applied to the first electrode is carried out to field-evaporate the projections present in the second electrode, and then, a voltage higher than the voltage V 1 is set as a new voltage V 1 , a voltage higher than the voltage V 2 is set as a new voltage V 2 and the first voltage-application step and the second voltage-application step are repeated.