G - Physics – 09 – G
Patent
G - Physics
09
G
375/39
G09G 3/00 (2006.01) H04N 3/12 (2006.01)
Patent
CA 1198534
ABSTRACT OF THE DISCLOSURE The present invention relates to a control process of an optical characteristic of a material for obtaining a display of a plurality of grey levels. The material has a plurality of zones distributed in matrix-like manner and interposed between a first group of p lines of parallel electrodes and a second group of q columns of parallel electrodes. The lines and the columns are crossed, a zone xiyj being defined by the region of the material covered by line xi, in which i is an integer such that 1 ? i ? p, and by column yj, in which j is an integer such that 1 ? j ?q. For controlling the zone xiyj of the material, a first series of signals with a zero mean value is applied to a line xi, the first series being divided into n different time fractions. A second series of signals with a zero mean value is applied to column yj, the second series is also being divided into n different time fractions of different durations such that the kth time fraction of the second series of signals is of the same duration as the kth fraction of the first series of signals, k being an integer such that 1 ? k ? n. The second series of signals being such that, for each time fraction, the signal of the second series is either in phase opposition or in phase with the corresponding signal of the first series.
388149
Clerc Jean F.
Robert Jacques
Commissariat A. L'energie Atomique
Goudreau Gage Dubuc
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