Cold Cathode Electron Tube, Its Manufacturing Process and Use Thereof for a Display Screen

A process for manufacturing a cathodoluminescent capsule including at least an envelope, a cold cathode emitting electrons by field effect, an anode and a control grid, the envelope being at least formed of a first internal wall for receiving the electrons and being disposed fading the cathode, said process including at least the steps of:

• depositing a luminophore layer and a reflective layer at least over the first internal wall, the luminophore layer being located between the first wall and the reflective layer;
• providing a cap carrying at least the anode, to the cathode and the control grid, the cap being further provided with an open tube;
• assembling the cap with the envelope so as to close and form the capsule, the luminophore layer being disposed in opposition to the cathode;
• vacuuming the capsule via the cap tube;
• and
• sealing the capsule by closing the cap tube, characterized in that it further comprises the step of depositing a conductive layer over at least a portion of a second internal wall adjacent to the first internal wall, the conductive layer contacting at least the luminophore layer, and in that the anode is brought into contact with the conductive layer.