Method for regenerating microtips of a flat display screen
AssigneePixtech S.A.
InventorBernard Bancal
Life of this patent
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Abstract
The present invention relates to a method for regenerating microtips of a flat display screen including a cathode with electronic emission microtips associated with a grid for extracting electrons emitted by the microtips, wherein the microtips are made to emit under a current density which is substantially higher than a nominal operating current density and for a duration which is substantially higher than a nominal operating addressing duration.
Claims9
A method for regenerating microtips of a flat display screen including a cathode with microtips associated with a grid for extracting electrons, comprising the step of:
- applying between the grid and the cathode, and for a duration substantially higher than a nominal addressing duration in operation, a substantially higher voltage differential than nominal operating voltage differentials, for causing the microtips to emit under a substantially higher current density than a nominal operating current density.
A method for controlling a flat display screen including a cathode with electronic emission microtips, associated with a grid for extracting electrons emitted by the microtips and with a cathodoluminescent anode comprising the step of:
- applying between the grid and the cathode, for a duration substantially higher than a nominal addressing duration in operation, a substantially higher voltage differential than nominal operating voltage differentials, for causing the microtips to emit under a substantially higher current density than a nominal operating current density.
A flat display screen including a cathode with microtips associated with a grid for extracting electrons and with a cathodoluminescent anode comprising:
- a first voltage source for biasing the grid;
- a second voltage source for biasing the grid;
- and
- means for selecting the first source during normal screen operation and for selecting the second source during a regeneration cycle of the microtips the second source issuing a higher voltage than that issued by the first source.
Dependencies are inferred from the claim text.