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Abstract

Driving circuit for plasma display device and a gray scale implementing method therefor are provided. The method includes the steps of (1) dividing total horizontal lines of one frame into X.times.Y subframes according to a relative luminance ratio, (2) dividing each frame into X subfields and allotting Y different subframes to each subfield, and (3) supplying corresponding gray scale data while sequentially erasing each X.times.Y horizontal lines during one horizontal period from the first horizontal electrode lines to the last Nth horizontal electrode lines, included in Y different subframes allotted to each subfield by repeatedly driving X subfields and scanning the same, thereby implementing a display picture of 2.sup.X.multidot.Y gray scales. At least two scanning and sustaining drivers are provided, and one frame is divided into one or more subfields by the drivers, different subframes are allotted to each subfield and then X subfields are repeatedly driven. In other words, since a plurality of horizontal lines to be scanned at a time in a sub-frame method are separately scanned, the overall scanning frequency is decreased. Thus, gray scales exceeding 256 levels can be easily implemented under a stabilized system. Also, flickers caused by the sub-field method can be eliminated. Further, luminance and contrast of a display picture can be improved.

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