Field emission device with circular microtip array
AssigneeTexas Instruments Incorporated
InventorKenneth G. Vickers
Life of this patent
Estimating the term…
Abstract
An electron emitter plate (110) for an FED image display has an extraction (gate) electrode (122) spaced by an insulating layer (25) from a cathode electrode including a conductive mesh (118). Circular arrays (112) of microtips (14) are located concentrically within circular mesh spacings (116) on a resistive layer (15), within apertures (26) formed in extraction electrode (122). Microtips (14) are laterally spaced from mesh structure (118) by substantially identical paths of a ballast-providing resistive layer (15), placing all microtips (14) at generally the same potential.
Claims19
An electron emitter plate comprising:
- a substrate;
- a first layer of conductive material deposited on said substrate;
- said first layer of conductive material being patterned in a mesh structure defining a mesh spacing with a center;
- a layer of insulating material deposited on said substrate over said first layer of conductive material;
- a second layer of conductive material deposited on said substrate over said layer of insulating material;
- said second layer of conductive material having a plurality of apertures;
- said apertures being arranged on a circle located concentrically within said mesh spacing and being uniformly spaced from said mesh structure;
- a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material;
- and
- a layer of resistive material laterally spacing said microtips by like resistive paths from said mesh structure.
An electron emitter plate comprising:
- a substrate;
- a first layer of conductive material deposited on said substrate;
- said first layer of conductive material being patterned in a mesh structure defining a plurality of mesh spacings;
- a layer of insulating material deposited on said substrate over said first layer of conductive material;
- a second layer of conductive material deposited on said substrate over said layer of insulating material;
- said second layer of conductive material having a cluster of apertures located within each mesh spacing;
- said apertures of each cluster being arranged in a circle located concentrically within said associated mesh spacing and being uniformly spaced from said mesh structure;
- a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material;
- and
- a layer of resistive material laterally spacing said microtips by like resistive paths from said mesh structure.
An electron emitter plate comprising:
- a substrate;
- a conductive mesh structure on said substrate defining a plurality of circular mesh spacings;
- insulating material on said substrate over said mesh structure;
- conductive circular paths on said substrate over said insulating material;
- said paths being respectively concentrically located within said mesh spacings and each pad having an array of apertures located on a circle concentric with said pad;
- a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material;
- and
- resistive material laterally spacing said microtips by like resistive paths from said mesh structure.
An electron emitter plate comprising:
- a substrate;
- a first layer of conductive material deposited on said substrate;
- said first layer of conductive material being patterned in a mesh structure defining a circular mesh spacing with a center;
- a layer of insulating material deposited on said substrate over said first layer of conductive material;
- a second layer of conductive material deposited on said substrate over said layer of insulating material;
- said second layer of conductive material having a plurality of at least six apertures;
- said apertures being arranged on a circle located concentrically within said mesh spacing;
- and
- a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material.
Dependencies are inferred from the claim text.