Image display device and method of controlling same

1. An image display device with active matrix comprising:

a) a number of light emitters forming a network,

divided into rows and columns;

b) means for supplying power to the emitters;

c) means of controlling the emitters comprising:

a current modulator for each emitter, the modulator comprising a source electrode, a drain electrode, a gate electrode, the modulator being able to be passed through by a drain current, to supply said emitter for a voltage between the source electrode and the gate electrode, greater than or equal to a trigger threshold voltage of this modulator;

a storage capacitor for each emitter, said capacitor comprising a first and a second terminals and being able to store electrical charges at the gate electrode of each modulator;

addressing means able to address display data to the emitters of each column;

selection means able to select the emitters of each row, the selection means comprising a selection switch for each emitter, the selection switch being specifically for enabling addressing data supplied by the addressing means to be applied between the gate electrode and the source electrode of each modulator; and

d) at least one inverse bias voltage generator specifically for applying an inverse bias voltage of the bias of said addressing data between the gate electrode and the source electrode of each modulator;

wherein the image display device also comprises:

an inverse bias switch for each modulator to compensate for the variation in the trigger threshold voltage of each modulator, said inverse bias switch being connected between, on the one hand, the gate electrode of each modulator and the first terminal of the storage capacitor of this emitter, and, on the other hand, the or each inverse bias voltage generator and the second terminal of the storage capacitor of this emitter; and

control electrodes, each control electrode being able to drive all of the inverse bias switches of a row of emitters.

2. The device as claimed in claim 1 , wherein the selection means comprise selection electrodes specifically for driving the selection switches, said selection electrodes being separate and independent of the control electrodes.

3. The device as claimed in claim 1 , wherein the network formed by the emitters comprises a first group of rows of emitters and a second group of rows of emitters, the rows of the two groups being interposed, and in that each control electrode is connected to the gate of the inverse bias switches of a row of emitters of the first group and to the gate of the selection switches of a row of emitters of the second group to control the simultaneous closure of the selection switches and of the control switches belonging to these rows of emitters.

4. The device as claimed in claim 1 , wherein it comprises a single inverse bias voltage generator connected to all the inverse bias switches of the device.

5. The device as claimed in claim 1 , wherein it comprises a number of inverse bias voltage generators specifically for each to produce an inverse bias voltage that is specific and different from the inverse bias voltages produced by the other generators, each generator being connected only to all the inverse bias switches of a row of emitters.

6. A method of driving an image display device as claimed in claim 3 , said device comprising, in turn, a first and a second row of emitters, wherein the method comprises the following steps:

application of a first selection voltage to the control electrode connected to the selection switches of the first row of emitters, at a predefined frequency,

application of a second selection voltage to the control electrode connected to the selection switches of the second row of emitters, at the same predefined frequency,

wherein the applications of the first and second selection voltages are offset by a half-period, the duration of this half-period being equal to the duration of an interlaced frame, wherein an image comprises two interlaced frames.

7. A method of driving an image display device as claimed in claim 2 , said device comprising, in turn, a first and a second row of emitters, wherein the method comprises the following steps:

illuminating the emitters of the screen during a first phase,

switching off said emitters during a second phase, the first phase being offset in time by a fraction of a period relative to the second phase, wherein the first and the second phase constitute an image frame.

8. The method as claimed in claim 7 , wherein the fraction of a period is equal to a half of the image frame.

9. The drive method as claimed in claim 7 , wherein the duration of the period is equal to the duration of the image frame.