METHOD OF COMPENSATING FOR THE DIFFERENCES IN PERSISTENCE OF THE PHOSPHORS IN AN IMAGE DISPLAY SCREEN AND DEVICE FOR CONTROLLING SAID SCREEN

摘要

The present invention relates to a method of compensating for the differences in persistence of the phosphors in an image display screen consisting of cells arranged in lines and in columns, several adjacent cells being covered with different phosphors in order to form a pixel, the cells of one pixel being put either into an "off" state or into an "on" state for a time within one frame period depending on the grey level to be displayed. According to the method, at the pixel, the transitions between a first grey level and an adjacent second grey level are detected and if the transition is greater than a threshold the state of the cell covered with a persistent phosphor is forced to the second grey level before the end of the frame period. The invention applies especially to plasma panels. IMAGE