Cathodoluminescent screen including a matrix source of electrons

A cathodoluminescent screen including an electron matrix source and an opposing cathodoluminescent anode, the electron matrix source including:

• first parallel electrodes defining columns which form cathodic conductors associated with microtips for emitting electrons,
• second parallel electrodes defining rows which form grids that are electrically insulated from the columns and that are at an angle with the latter, wherein areas in which the rows and the columns cross form a first set of crossing zones, and
• row control means for making the potential of the rows evolve up to a positive value Vl, wherein the screen further includes:
• at least one additional electrode defining a zeroizing column parallel to the other columns and crossing all of the rows, the areas in which the rows and the zeroizing column Cross forming a second set of crossing zones, the zeroizing column also forming a cathodic conductor associated with microtips for emitting electrons,
• means for controlling the zeroizing column and for bringing said zeroizing column to a negative potential so that, regardless of the potential of the rows crossed by this zeroizing column, electrons may be emitted in the second set of crossing zones of the zeroizing column and rows,
• at least one additional anode defining a control anode located opposite the zeroizing column, and
• means for polarizing the control anode and for raising the latter to a potential Vac that is lower than Vl, and
• wherein the row control means includes a single corresponding output transistor for each row which is provided to raise each row to the potential Vl when its corresponding transistor is activated and to disconnect each row from the potential source Vl when its corresponding transistor is deactivated.