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An improved adaptive subfield coding driving method was proposed to reduce the static false contours when the simple-accumulation lighting mode is applied to alternating current plasma display panels (ac PDPs). In the proposed method, when the weighted ratio of the subgrayscale interval to the main grayscale interval is smaller, the gray cumulative probability densities in the subgrayscale interval are sampled in order to locate the sampling gray levels at which the gray probability densities are larger. When the weighted ratio of the subgrayscale interval to the main grayscale interval is larger, the gray levels in the subgrayscale interval are sampled directly so as not to generate larger quantization error brought by the excessive convergence of the sampling gray levels. The simulation results show that the proposed method can eliminate the dynamic false contours in the AC PDPs and has better grayscale expression capability than the existing similar method appearing in the literature. The method proposed in this paper can reproduce the original image information more faithfully.