Control method for a matrix display screen

Method for controlling a matrix display screen with lines (li) and columns (cj) that intersect to form an image point (Pi,j), including application of a line selection voltage (VLS) to a line during a line selection time (Tls), and simultaneously a voltage corresponding to a grey level (G) to be displayed at the associated image point to a column, characterised in that the said grey level is chosen from among 2q levels and is numerically coded according to a non-linear law in accordance with the brightness perception of a human eye, the different voltages (Vci, Vci+1) to be applied to the columns are chosen in a strictly increasing series of (2n+1) voltages where n is an integer ≧1, these voltages being distributed in N=2n pairs of consecutive voltages, each pair being used to display a range of grey levels and in that the line selection time (Tls) is subdivided into one or several groups of 2(q-n) time intervals where (q-n) is an integer >1, each group having the same duration, the distribution of these 2(q-n) time intervals into a group for a pair of voltages, being done according to a non-linear law with a transfer function close to the inverse of the transfer function previously used to code the grey levels for the corresponding grey levels range, the voltage applied to a column for a pair of voltages and a group of time intervals being determined either using one of the values of the pair of voltages throughout the duration of the group, or switching from one value of the pair of voltages to the other, at least once during the duration of the group at the end of a time interval.