Flat display screen with an addressing memory
AssigneePixtech S.A.
InventorBernard Bancal
Life of this patent
Estimating the term…
Abstract
A cathode-grid plate of a field-effect flat display screen of the type including a first set of row conductors, a second set of column conductors and, for each screen pixel, defined by the intersection of a column and of a line, an element for temporarily storing the luminance control signal of the considered pixel.
Claims8
A cathode-grid plate of a flat display screen, a cathode of which is formed of regions of electron emission microtips (2) having bases biased by cathode column conductors, a row-connected extraction grid (3) being formed of emissive areas (28′) individualized per pixel and provided with holes (4) at microtip locations, an intersection of a column and a row defining a location of a screen pixel, and including, for each screen pixel, a transistor for isolating an element (26) which temporarily stores a luminance control signal of a selected pixel, a control gate oxide (64) of each transistor being formed in an insulating layer separating the cathode conductors from the row-connected extraction grid formed of the emissive areas wherein the conductors being formed of meshing for biasing the bases of the microtips.
A flat display screen of the type including a cathode-grid plate, a cathode of which is formed of regions of electron emission microtips (2) for bombarding a cathodoluminescent anode, the microtips (2) having bases biased by cathode column conductors, a row-connected extraction grid (3) being formed of emissive areas (28′) individualized per pixel and provided with holes (4) at microtip locations, an intersection of a column and a row defining a location of a screen pixel, and including, for each screen pixel, a transistor for isolating an element (26) which temporarily stores a luminance control signal of a selected pixel, a control gate oxide (64) of each transistor being formed in an insulating layer separating the cathode conductors from the row-connected extraction grid formed of the emissive areas, wherein the conductors being formed of meshing for biasing the bases of the microtips.
A method for controlling a flat display screen comprising the steps of:
- providing a flat display screen including a cathode-grid plate, a cathode of which is formed of regions of electron emission microtips (2) for bombarding a cathodoluminescent anode, the microtips (2) having bases biased by cathode column conductors, a row-connected extraction grid (3) being formed of emissive areas (28′) individualized per pixel and provided with holes (4) at microtip locations, an intersection of a column and a row defining a location of a screen pixel, and including, for each screen pixel, a transistor for isolating an element (26) which temporarily stores a luminance control signal of a selected pixel, a control gate oxide (64) of each transistor being formed in an insulating layer separating the cathode conductors from the row-connected extraction grid formed of the emissive areas;
- and
- performing a line scanning for successively biasing row conductors and, for each row, applying a luminance control signal on each column conductor, wherein the conductors being formed of meshing for biasing the bases of the microtips.
Dependencies are inferred from the claim text.