Patent ID: 6765548
Filing Date: 2004-07-20
Classification: G09G

Abstract:
Method of displaying a video image on a plasma display panel for a duration of display, the said panel comprising a plurality of cells arranged in rows and columns, each cell being lit for a duration lying between zero and a maximum display time corresponding to the maximum brightness of a cell for a given brightness setting, the total time of illumination of a cell being divided into several illumination periods corresponding to various subscans among which are distinguished first subscans specific to an addressing of each cell and second subscans common to two cells arranged on neighbouring rows, such that, for a pair of cells sharing the same second subscans, the grey levels GL1 and GL2 of the said cells are decomposed into a common value CV and into a specific value SV1 and SV2 with the aid of the following equation: GL1=CV+SV1 and GL2=CV+SV2, with GL1 greater than or equal to GL2, the common value CV corresponding to the sum of the weights of the second subscans, the specific values SV1 and SV2 corresponding to the sum of the weights of the first subscans associated respectively with the grey levels GL1 and GL2,wherein the following steps are carried out: E1: coding of the highest grey level GL1 over the entirety of the subscans while favouring the subscans whose illumination time is the smallest; E2: extraction of a specific coding value corresponding to the sum of the first subscans used during the coding of step E1; E3: if the specific coding value extracted in step E2 is less than the difference GL1âˆ’GL2, then the values SV1 and CV correspond to the coding carried out in step E1, and the resulting value SV2 equal to GL2âˆ’CV is coded on the second subscans while favouring the subscans of low weight.