Patent ID: 8610651

Claim:
An active-matrix image display device comprising: several light emitters forming an array of emitters distributed in rows and columns; means for controlling the emission of the emitters comprising: for each emitter of the array, a current modulator comprising a source electrode, a drain electrode and a gate electrode, a drain current being able to pass through said modulator in order to supply said emitter, for a voltage between the drain or the source and the gate equal to or greater than a trip-threshold voltage, for each modulator, storage means capable of storing electric charges at the gate electrode of the modulator, for each row of emitters, row select means capable of selecting in succession the emitters of each row of emitters, for programming these emitters, and for each column of emitters, column address means capable of addressing in succession each selected emitter of said column of emitters by applying, during the programming step of this selected emitter, a value representative of a data setpoint to the gate electrode of the modulator associated with this selected emitter, in order to actuate it, a DC voltage generator for supplying current simultaneously to each of the emitters of each column through a same and single supply line during both emission steps and programming steps of the emitters of said column, as soon as the modulator of each column is turned on; and trip-threshold voltage compensation means comprising comparators, the comparators being capable of comparing, during the step of programming a selected emitter, a value representative of the drain current supplying the selected emitter with the value representative of the data setpoint for controlling the quantity of charge stored in the storage means, wherein the compensation means comprise, for each column of emitters, one single separate unit for determining a representative value of the drain current supplying the selected emitter of this column by measuring the total current supplying all of the emitters of this column, and for turning on the emitters already during the programming step.