Patent ID: 7425936
Filing Date: 2008-09-16
Classification: G09G

Abstract:
1. A driving apparatus for a plasma display panel that divides each field of an image displayed on the plasma display panel according to an input image signal into a plurality of subfields and displays the image corresponding to the image signal by expressing gray levels using a combination of the subfields, the driving apparatus comprising: a pseudo-contour detector for detecting pseudo-contour by comparing illuminating patterns of the subfields and the gray levels of a present frame and a precedent frame, the illuminating patterns being patterns in which the subfields are illuminated in respective said present and precedent frames; a gray level group portion for changing the gray levels of the input image signal differently with respect to a plurality of gray level groups previously prepared, according to information of degree of the pseudo-contour of the input image signal detected by the pseudo-contour detector; and an error diffuser for performing error diffusion differently at every gray level group with respect to differences of the gray levels of the input image signal and the gray levels of an image signal output from the gray level group portion.