Patent ID: 7180494

Claim:
A control method for a multiplexed display comprising a plurality of pixels arranged in lines and in columns and coupled to line electrodes and column electrodes, each of said pixels being selectively activated or deactivated by a determined combination of a line signal and of a column signal respectively applied to the corresponding line and column electrodes, these line and column signals varying between a ground voltage, an activation voltage and a plurality of non-activation voltages, so-called active lines of the display being sequentially activated once during a period of a half-cycle, method according to which said display is operated in a first so-called normal operating mode wherein all the lines of the display are activated, said line and column signals having a first so-called normal multiplex rate in said first operating mode, wherein: said display is switched into at least a second so-called standby operating mode, where so-called non-active lines of the display are deactivated by applying, to the corresponding line electrodes, so-called non-activation line signals, these non-activation line signals being determined such that, when they are combined with the column signals, each pixel of said non-active lines receives at its terminals a signal whose amplitude is too low to activate it, so that the multiplexing rate of the display is 1:n, where n is an integer representing the number of active line electrodes, in said at least one second operating mode, one acts on the line signals applied to the active lines and on said column signals such that they have a second multiplex rate corresponding to the number of active lines in said at least second operating mode and whose value is reduced, with respect to said first multiplex rate, in proportion to the number of non-active lines, each line signal being sequentially brought once, during a half-cycle, for a determined duration, to activation voltage, such that the lines of the display are sequentially activated once during a half cycle period, and during the passage from the first to said at least second operating mode, the value of said activation voltage is reduced so as to compensate for the increase in the effective value of the signal present at the terminals of a non-active pixel, allowing a reduction of the refreshing frequency and a reduction of the activation voltage.