Patent ID: 7339555
Filing Date: 2008-03-04
Classification: G09G

Abstract:
1. An apparatus for displaying an image on a plasma display panel that divides an image of each frame displayed thereon in accordance with an image signal to a plurality of subfields and expresses gray level by a combination of luminance weights of the subfields, the apparatus, comprising: an image signal processor to generate digital image data from the image signal; a vertical frequency detector for analyzing the digital image data output from the image signal processor to detect a type of the image signal, and outputting a detected result as a data switch value together with the digital image data; a memory controller for receiving the digital image data and the data switch value generated by the vertical frequency detector, and generating subfield data corresponding to the type of the image signal; wherein the subfield data is comprised of a first subfield group, a second subfield group, and a third subfield group arranged consecutively in time order when the image signal is of a first type; an automatic power control (APC) portion for detecting a load ratio of the digital image data output from the vertical frequency detector, calculating an APC level according to the detected load ratio, and calculating and outputting a sustain pulse number corresponding to the calculated APC level; a subfield changing range determiner for determining a changing range of the second subfield group and the third subfield group according to the load ratio output from the APC portion, and determining starting positions of the second subfield group and the third subfield group within the determined changing range; and a sustain/scan pulse driving controller for receiving the sustain pulse number, the starting positions of the second subfield group and the third subfield group, and the data switch value and for generating subfield arrangement construction according to the type of the image signal, and generating a control signal based on the subfield arrangement construction to apply to the plasma display panel.