Patent ID: 8063854

Claim:
A video display device comprising a matrix having rows and columns, each of said columns comprising: a plurality of light emitting elements; a plurality of first current modulators, each one of which being associated to one of said light emitting elements, the first current modulators being arranged to draw a feed current of programmable magnitude for the associated light emitting element, from a circuit node that is common to all of the plurality of first current modulators of said column, the luminosity of the light emitting element corresponding to the feed current; a current generator, controlled by video data representative of desired luminosities of said light emitting elements, the current generator being arranged to controllably supply a first current to said common circuit node, the magnitude of which being representative of a desired luminosity of at least one of said light emitting elements connected to said common circuit node; the common circuit node, in steady state, having a specific voltage level when the current supplied to the common circuit node equals the current drawn from the common circuit node by one or more of the plurality of first current modulators; further comprising: a second current modulator, the second current modulator being arranged to controllably supply a second current to said common circuit node; a first comparator having inputs connected to said common circuit node and to a reference terminal, respectively, the reference terminal being constantly held at said specific voltage level, an output of said comparator being selectively connected to a control input of said second current modulator, for controlling the second current supplied to the common circuit node from said second current modulator so as to yield said specific voltage level at the common circuit node, wherein said specific voltage level is attained when the current provided by the second current modulator corresponds to the sum of the currents drawn by those first current modulators that already have been programmed to draw respective feed currents.