Abstract:
A field emission display includes electrostatic discharge protection circuits coupled to an emitter substrate and an extraction grid. In the preferred embodiment, the electrostatic discharge circuit includes diodes reverse biased between grid sections and a first reference potential or between row lines and a second reference potential. The diodes provide a current path to discharge static voltage and thereby prevent a high voltage differential from being maintained between the emitter sets and the extraction grids. The diodes thereby prevent the emitter sets from emitting electrons at a high rate that may damage or destroy the emitter sets. In one embodiment, the diodes are coupled directly between the grid sections and the row lines. In one embodiment, the diodes are formed in an insulative layer carrying the grid sections. In another embodiment, the diodes are integrated into the emitter substrate.
Abstract:
A thin-film edge field emitter device includes a substrate having a first portion and having a protuberance extending from the first portion, the protuberance defining at least one side-wall, the side-wall constituting a second portion. An emitter layer is disposed on the substrate including the second portion, the emitter layer being selected from the group consisting of semiconductors and conductors and is a thin-film including a portion extending beyond the second portion and defining an exposed emitter edge. A pair of supportive layers is disposed on opposite sides of the emitter layer, the pair of supportive layers each being selected from the group consisting of semiconductors and conductors and each having a higher work function than the emitter layer.
Abstract:
This invention relates to an electron source and an image forming apparatus each of which particularly comprises a surface conduction type electron emitting element as an electron emitting element, a method of manufacturing an electron source and an image forming apparatus, in which the energization forming treatment step of the surface conduction type electron emitting element is performed by applying a voltage to an electron emitting portion formation thin film via a nonlinear element connected in series with the thin film and having nonlinear voltage/current characteristics, an electron source and an image forming apparatus in each of which the nonlinear element is connected in series with the surface conduction type electron emitting element, and a method of driving the same.
Abstract:
In a field emission cold cathode device including one emitter, a supporting region formed of a conductor or a semiconductor for supporting the emitter, and a gate electrode provided in the proximity of the emitter, electrons are supplied to the emitter from a capacitance formed by a pair of electrodes separated from each other, one of the pair of electrodes being DC connected to the emitter. The emitted electron amount can be controlled by controlling a voltage applied to the other of the pair of electrodes. Thus, it is possible to minimize the variation in the emission current caused by variation in the emitter devices, which was unavoidable in the prior art.
Abstract:
A design for a field emission device comprising a cold cathode emitter, a control gate and a focus gate, is discussed. The focus gate is connected to the emitter voltage source and a ballast resistor is inserted between this connection point and the emitter. This ensures that the focus gate will always be more negative than the emitter, this difference in potential increasing with increasing emitter current. This leads to a linear current-voltage characteristic for the device and also makes for a tighter electron beam than that provided by designs of the prior art, A physical realization of the design is described along with a cost effective method for manufacturing said physical realization.
Abstract:
The present invention enables a reduction in the number of electrical conductors which must be connected to each pixel in a field emission display. A first feature of the invention is that the functions of a conventional power supply ground conductor and a conventional "row enable" logic signal conductor are combined in a single "inverted row enable" logic signal conductor for each display row. A second feature is that the functions of a conventional "column enable" logic signal conductor and a conventional luminance signal conductor are combined in a "column luminance" signal conductor for each display column. The first feature is implemented by connecting the "inverted row enable" logic signal conductor as the source of emitter tip current for all the pixels in a display row. The second feature is implemented by gating (logically ANDing) a luminance signal by a "column enable" logic function to create a column luminance signal for each display column. The current flow through the emitter tips of each pixel, and hence the luminance of each pixel, is controlled by a transistor connected in series between the emitter tips of that pixel and the "row enable" signal conductor for the display row containing that pixel. The gate of the transistor connects to a conductor carrying the "column luminance" signal for the display column containing that pixel.
Abstract:
A cathode (1) includes a substrate (10), a resistive layer (11) disposed on the substrate (10); at least one cathode conductor (13), and microtips (2) disposed on the resistive layer (11), wherein the cathode conductor (13) has circular wells (17) in the middle of each of which a microtip (2) is disposed, whereby the microtips (2) are electrically isolated from the cathode (13) by a constant access resistance.
Abstract:
A field electron emission material comprises an electrically conductive substrate and, disposed thereon, electrically conductive particles embedded in, formed in, or coated by a layer of inorganic electrically insulating material. A first thickness material is defined between the particle and the environment in which the material is disposed. The dimension of each particle between the first and second thicknesses is significantly greater than each thickness. Upon application of a sufficient electric field, each thickness provides a conducting channel, to afford electron emission from the particles By use of an inorganic insulating material, surprisingly good stability and performance have been obtained. The particles can be relatively small, such that the electron emitting material can be applied to the substrate quite cheaply by a variety of methods, including printing. The material can be used in a variety of devices, including display and illuminating devices.
Abstract:
A process for forming a microtip cathode structure on a field emission display panel which avoids the need of vacuum depositing a lift-off layer for the microtip deposition overstructure in specially equipped reactors to accomplish a deposition at a grazing angle, by co-patterening the lift-off layer together with an underlying metal grid layer using a succession of different etching steps through the openings of a grid definition mask. According to an embodiment, nickel is used as lift-off material and is either wet-etched or sputter-etched before performing a plasma etch of the underlying grid metal layer. According to an alternative embodiment, the masking resist layer is used as lift-off material.
Abstract:
A micropoint assembly is disclosed that includes a micropoint and a switch coupled to the micropoint. The switch is operable to activate and deactivate the micropoint and includes a nitride oxidation layer. The switch may be a MOSFET with a gate oxide that contains the nitride oxidation layer. In such configuration, the nitride oxidation layer contains the greatest concentration of SiN within the gate oxide. A method for constructing the micropoint assembly and field emission displays incorporating the micropoint assembly is also disclosed. Such method includes simultaneous annealing of the nitride oxidation layer during conventional FED fabrication steps.