Abstract:
A field emission cathode for use in flat panel displays is disclosed comprising a layer of conductive material and a layer of amorphic diamond film, functioning as a low effective work-function material, deposited over the conductive material to form emission sites. The emission sites each contain at least two sub-regions having differing electron affinities. Use of the cathode to form a computer screen is also disclosed along with the use of the cathode to form a fluorescent light source.
Abstract:
A matrix-addressed diode flat panel display of field emission type is described, utilizing a diode (two terminal) pixel structure. The flat panel display comprises a cathode assembly having a plurality of cathodes, each cathode including a layer of cathode conductive material and a layer of a low effective work-function material deposited over the cathode conductive material and an anode assembly having a plurality of anodes, each anode including a layer of anode conductive material and a layer of cathodoluminescent material deposited over the anode conductive material, the anode assembly located proximate the cathode assembly to thereby receive charged particle emissions from the cathode assembly, the cathodoluminescent material emitting light in response to the charged particle emissions. The flat panel display further comprises means for selectively varying field emission between the plurality of corresponding light-emitting anodes and field-emission cathodes to thereby effect an addressable grey-scale operation of the flat panel display.
Abstract:
A matrix-addressed diode flat panel display of field emission type is described, utilizing a diode (two terminal) pixel structure. The flat panel display includes a cathode assembly having a plurality of cathodes, each cathode including a layer of cathode conductive material and a layer of a low effective work-function material deposited over the cathode conductive material and an anode assembly having a plurality of anodes, each anode including a layer of anode conductive material and a layer of cathodoluminescent material deposited over the anode conductive material, the anode assembly located proximate the cathode assembly to thereby receive charged particle emissions from the cathode assembly, the cathodoluminescent material emitting light in response to the charged particle emissions. The flat panel display further includes the capability for selectively varying field emission between the plurality of corresponding light-emitting anodes and field-emission cathodes to thereby effect an addressable grey-scale operation of the flat panel display.
Abstract:
One embodiment of the present invention is a linear amplifier based on a field emission device that is driven at its input in current-mode. The ratio (gamma) of the separation distance between the anode and cathode (d.sub.ak) to the separation distance between the cathode and gate (d.sub.gk) is in the range of 20 to 200. The amplifier betas that result from these gammas range from a low of 30 to a high of 1000. The linear amplifier is combined with an active matrix to form a vacuum flat-panel display with good gray-scale performance.
Abstract:
A method of forming a self-aligned gated field emitter with substantial manufacturing advantages is described. There is provided a substrate having at its surface a conductive layer. A first dielectric layer is deposited over the substrate. A conducting layer is deposited over the dielectric layer. Lithography and etching are used to form an opening through the conducting layer and the dielectric layer down to the surface of the substrate wherein there is formed an overhang of the conducting layer over the etched dielectric layer in the opening. Material is vertically deposited through the opening and over the conducting layer until the field emitter is formed and the opening is closed by build up of the depositing material over the conducting layer. At least a portion of the build up of the depositing material over the conducting layer is oxidized down to the desired opening size to form an oxide layer of the material. The oxide layer is removed by etching to expose the desired opening, thereby completing formation of the self-aligned gated field emitter.
Abstract:
A field emitter structure is formed, having trench accessible cold cathode tips is fabricated by forming trenches in a substrate. The trenches are subsequently filled with a conformal insulating layer, a highly conductive layer, and a polysilicon layer. The layers are etched to form emitter tips which are disposed contiguous with the trenches. Electrical signals are propagated through the trenches permitting increased performance of the emitter structure.
Abstract:
For manufacturing an electrically conductive tip composed of a doped semiconductor material, a mask layer is produced on a substrate composed of the semiconductor material. This mask layer contains a material at least at its surface and directly on the substrate whereon the semiconductor material does not grow in a selective epitaxy. An opening wherein the surface of the substrate lies exposed is produced in the mask layer. The electrically conductive tip is produced by a selective epitaxy on the exposed surface of the substrate such that the layer growth in the direction parallel to the surface of the substrate is lower than in the direction perpendicular to the surface of the substrate.
Abstract:
A field-emission type electron source includes (i) a single-crystal tungsten rod having a sharpened terminus and (ii) a mass of ZrO formed only on a portion of the surface, or the entire surface, of the sharpened terminus. In preferred design, the single-crystal tungsten rod is placed in a gaseous medium that consists of oxygen and a non-oxygen gas. The molar ratio between oxygen and the non-oxygen gas is greater than 1:1.
Abstract:
A stable cold field electron emitter is produced by forming a coating on an emitter base material. The coating protects the emitter from the adsorption of residual gases and from the impact of ions, so that the cold field emitter exhibits short term and long term stability at relatively high pressures and reasonable angular electron emission.
Abstract:
An electron emission device includes a polycrystalline film of lanthanum boride, and a size of a crystallite which composes the polycrystalline film is equal to or more than 2.5 nm and equal to or less than 100 nm, preferably the film thickness of the polycrystalline film is equal to or less than 100 nm.