Abstract:
A field emitter cell includes a thin-film-edge emitter normal to the gate layer. The field emitter cell may include a conductive substrate layer, an insulator layer having a perforation, a gate layer having a perforation, an emitter layer, and other optional layers. The perforation in the gate layer is larger and concentrically offset with respect to the perforation in the insulating layer and may be of a tapered construction. Alternatively, the perforation in the gate layer may be coincident with, or larger or smaller than, the perforation in the insulating layer, provided that the gate layer is shielded from the emitter from a direct line-of-sight by a nonconducting standoff layer. Optionally, the thin-film-edge emitter may include incorporated nanofilaments. The field emitter cell has low gate current, making it useful for various applications such as field emitter displays, high voltage power switching, microwave, RF amplification and other applications that require high emission currents.
Abstract:
A non-power generating current limiting device such as a field effect transistor is provided to output a regulated current in dependence upon a control voltage. An electron field emitter is connected to a drain or output of the non-power generating current limiting device to receive the regulated current. A tip of the electron field emitter emits electrons towards a collector anode. An extractor gate can be provided between the electron field emitter and the collector anode to control the rate of electron emission from the electron field emitter. Because the non-power generating current limiting device regulates the current to the electron field emitter, a maximum current output of the electron field emitter is limited to the regulated current from the voltage controlled current source. The electron field emitter is thus protected from destruction due to excess current. The non-power generating current limiting device can also be used to modulate electron emission from the field emitter.
Abstract:
The present invention is directed to fabricating a MOSFET-controlled FEA, in which the emitter array and the cathode electrode are separated and connected to each other by a MOSFET, the cathode electrode and the n-well beneath the emitter array thereby being used as a source and a drain of the MOSFET.
Abstract:
A field emission cold cathode has a plurality of emitters in a group for each gate electrode and a serial resistance layer divided into a plurality resistance layer sections each corresponding to one of the emitters. The resistance layer is divided by a deep trench filled with an insulator layer or conductive layer forming a P-N junction between the same and the resistance layer section. A linear voltage-current characteristic is obtained by a stable resistance of the resistance layer section to prevent a short-circuit failure between the emitter and the gate electrode.
Abstract:
An electron-emitting device employs a multi-layer resistor (46). A lower layer (48) of the resistor overlies an emitter electrode (42). A set of electron-emissive elements (54) overlie an upper layer (50) of the resistor. Each resistive layer extends continuously from a location below each electron-emissive element to a location below each other electron-emissive element. The two resistive layers are of different chemical composition. The upper resistive layer is typically formed with cermet. The lower resistive layer is typically formed with a silicon-carbon compound.
Abstract:
For use in cathodoluminescent field emission display devices, a cathode emitter can comprise an inverted field effect transistor having a diamond film or other low effective work function material deposited onto the channel layer of the transistor, such that the diamond film provides a source of primary electron emissions. A variable voltage source is applied to the gate of the transistor creating an electric field that controls the conductivity of the channel layer, thereby activating or deactivating electron emissions from this cathode emitter structure. In addition, electron blocking junctions can be incorporated into the emitter structure to inhibit current flow through the device during a deactivated state. In a variation, the transistor of the cathode emitter has the diamond film being deposited onto an electrically conductive pad that is electrically connected to, and extending outwardly from, the transistor. Alternatively, a sideways laterally gated transistor structure can be used with the emitter surface being applied to the transistor's drain. A near mono-molecular oxide film of high secondary electron emission material can also be included on the emitter surface for enhanced electron emissions.
Abstract:
A video display with integrated control circuitry formed on a single dielectric substrate, includes a dielectric substrate; emitter cathodes formed on the dielectric substrate for emitting electrons; a window plate mounted a fixed distance from the substrate to define a vacuum chamber therebetween; phosphors mounted to the window plate which generate light when irradiated with the electrons; and field effect transistors mounted to the substrate which are electrically interconnected to the emitter cathodes for selectively controlling light emissions from the phosphors.
Abstract:
Electron field emission devices (cold cathodes), vacuum microelectronic devices and field emission displays which incorporate cold cathodes and methods of making and using same. More specifically, cold cathode devices comprising electron emitting structures grown directly onto a substrate material. The invention also relates to patterned precursor substrates for use in fabricating field emission devices and methods of making same and also to catalytically growing other electronic structures, such as films, cones, cylinders, pyramids or the like, directly onto substrates.
Abstract:
A field emission display includes a substrate with a plurality of cathode layers provided thereon. A plurality of micro tips are provided on each of the cathode layers. A plurality of gate insulating layers are also provided on the cathode layers, each of the gate insulating layers having a plurality of holes for accommodating each unit of the micro tips. A plurality of gate electrodes are provided on the gate insulating layers, each of the gate electrodes having a plurality of holes corresponding to each hole of the plurality of gate insulating layers, each of the plurality of gate insulating layers and each of the plurality of gate electrodes being alternately provided on each other.
Abstract:
A field-emission structure suitable for large-area flat-panel televisions centers around an insulating porous layer that overlies a lower conductive region situated over insulating material of a supporting substrate. Electron-emissive filaments occupy pores extending through the porous layer. A conductive gate layer through which openings extend at locations centered on the filaments typically overlies the porous layer. Cavities are usually provided in the porous layer along its upper surface at locations likewise centered on the filaments.