Field emission device with lattice vacancy post-supported gate
First Claim
1. An electron emitter plate comprising:
- a substrate;
a first layer of conductive material deposited on said substrate;
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 in a regular, periodic array defining a lattice having at least one internal vacancy;
a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material;
said insulating layer being formed with a cavity connecting said apertures and commonly containing said microtips;
said insulating layer supporting said second layer of conductive material above said first layer of conductive material peripherally of said cavity; and
said insulating layer forming a post under each lattice vacancy, said post supporting said second layer of conductive material above said first layer of conductive material centrally of said cavity.
1 Assignment
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Accused Products
Abstract
An electron emitter plate (110) for an FED image display has an extraction (gate) electrode (22) spaced by a dielectric insulating spacer (125) from a cathode electrode including a conductive mesh (18). Arrays (12) of microtips (14) are located in mesh spacings (16), within apertures (26) formed in clusters (23) in extraction electrode (22). Microtips (14) are deposited through the apertures (26). Apertures (26) are arranged in regular, periodic arrays (23, 23'"'"', 123, 123'"'"') defining lattices having occupied apertured positions and internal unapertured vacancy positions (150, 150'"'"'). The insulating spacer (125) is etched to undercut electrode (22) to connect apertured lattice positions, forming a common cavity (141) for microtips (14) within each mesh spacing (16), and leaving central posts (143) at the unapertured vacancies (150, 150'"'"'). The etch-out reduces the dielectric constant factor of gate-to-cathode capacitance in the finished structure. Placing posts at vacancy positions enables gate support over the cavity without sacrificing high microtip density.
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Citations
12 Claims
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1. An electron emitter plate comprising:
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a substrate; a first layer of conductive material deposited on said substrate; 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 in a regular, periodic array defining a lattice having at least one internal vacancy;a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material; said insulating layer being formed with a cavity connecting said apertures and commonly containing said microtips;
said insulating layer supporting said second layer of conductive material above said first layer of conductive material peripherally of said cavity; and
said insulating layer forming a post under each lattice vacancy, said post supporting said second layer of conductive material above said first layer of conductive material centrally of said cavity. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. An electron emitter plate comprising:
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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 and said mesh spacings; 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;
the apertures of each cluster being arranged in a regular, periodic array defining a lattice having at least one internal vacancy;a conductive microtip formed in each aperture in electrical communication with said first layer of conductive material; said insulating layer being formed with a cavity located within each mesh spacing, each cavity connecting the apertures of one of said clusters and commonly containing the microtips associated with that cluster;
said insulating layer supporting said second layer of conductive material above said first layer of conductive material peripherally of each cavity; and
said insulating layer forming a post under each lattice vacancy, said post supporting said second layer of conductive material above said first layer of conductive material centrally of each cavity. - View Dependent Claims (7, 8, 9, 10)
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Specification