Patent ID: 7710363

Claim:
A method for controlling a matrix display screen with lines (li) and columns (cj), an intersection between a line and a column forming an image point (Pi,j), said image point being able to display a grey level chosen from among 2 q grey levels, said 2 q grey levels being numerically coded according to a non-linear relationship in accordance with a brightness perception of a human eye, the method comprising: applying a line selection voltage (VLS) to a line corresponding to said image point during a line selection time (Tls). and simultaneously applying a voltage signal corresponding to a given grey level (G) to a column corresponding to said image point, said line selection voltage and voltage signal enabling said image point to display said given grey level, wherein said applying includes, selecting from among different pairs of voltages (Vci, Vci+1) corresponding to said voltage signal applied to the column, said different pairs of voltages being a strictly increasing series of (2 n +1) voltages where n is an integer ≧1, these voltages being distributed in N=2 n pairs of consecutive voltages, each pair usable to display a range of grey levels, subdividing the line selection time (Tls) into one or several groups of 2 (q-n) time intervals where (q-n) is an integer >1, each group having a same duration, distributing these 2 (q-n) time intervals into a group for a pair of voltages, corresponding to the voltage signal selected in the selecting, according to the non-linear relationship, and applying the voltage signal to said column includes applying one of the pair of voltages selected in the selecting throughout a duration of the group, or switching from one value of the pair of voltages selected in the selecting to the other, at least once during the duration of the group at an end of a time interval.