Leydig, Voit & Mayer
Plasma display device
 A plasma display device and a driving method thereof are disclosed in which cathodes are provided in the form of steps or in the form of depressions and projections to form multistep discharge gaps between the cathodes and anodes, while amplitude modulated pulses, width modulated pulses, or composite width/amplitude modulated pulses are supplied to the cathode or anodes, the pulse amplitudes for the different steps being set in such a manner that the discharges should occur selectively or wholly at the different discharge regions of the different gaps formed by the cathodes. The device of the present invention improves the gray scale to a great extent. 
Samsung Electronic Devices, Ltd.
G H
G09G H01J
inventional inventional
Seung-Woo Kyoung-min
Lee Kim