Abstract:
An electron-emitting device contains an electron focusing system (37 or 37A) formed with a base focusing structure (38 or 38A) and a focus coating (39 or 39A) that penetrates partway into a focus opening (40) extending through the base focusing structure above an electron-emissive element (24). The focus coating is normally of lower resistivity than the base focusing structure and thereby provides most of the focus control over electrons emitted by the electron-emissive element. The focus coating is typically formed by an angled deposition technique.
Abstract:
A field emission device is described that comprises, in addition to the main, conventional array of field emission devices and its associated driving circuits, an additional, separate, pixel-sized group of field emission devices close to, but separated from, said main array. Electrons emitted by the additional pixel are collected on a separate, non fluorescent, anode and additional circuitry is provided, including a feedback loop from a detector of the additional pixel's cathode current to the gate voltage supply of the main array. Consequently the voltage of the gate lines varies in inverse proportion to the cathode current of the additional pixel. This results in a display whose brightness is constant even when turned on for the first time or after a period of idleness. A method for manufacturing the device is also described.
Abstract:
In a field emission electron gun including emitters (104) on predetermined parts of a substrate (109), an insulator film (105) on a remaining part of the substrate, a first gate electrode (101) on the insulator film so as to surround the emitters with a space left between each emitter and the first gate electrode and to have an outer peripheral surface defining an emission region (E), a gate edge portion (106) of a conductor is formed on the insulator film to surround the outer peripheral surface of the first gate electrode in contact with the outer peripheral surface of the first gate electrode. A second gate electrode (102) is formed on the insulator film to surround the gate edge portion with a distance left between the gate edge portion and the second gate electrode applied with a second voltage less than a first voltage applied to the first gate electrode.
Abstract:
An apparatus and a method for stabilizing the threshold voltage in an active matrix field emission device. The method includes the formation of radiation blocking elements between a cathodoluminescent display screen of the FED and semiconductor junctions formed on a baseplate of the FED.
Abstract:
A high aspect ratio gated emitter structure and a method of making the structure are disclosed. Emitters may be provided in a densely packed array on a support. Two distinct layers of insulator material may surround the emitters. The lower layer of insulator material may be a non-conformally applied spray-on or spin-on insulator. The non-conformal insulator material may pool at the base regions of the emitters so that the tip regions of the emitters extend out of the lower layer of insulator material. The upper layer of insulator material is applied to the lower layer using a conformal process so that the tip regions of the emitters are covered by the upper layer of insulator material. Gate material is applied to the upper layer of insulator material. Holes are provided in the gate material over the tip regions and wells are provided in the upper layer of insulator material surrounding the tip regions. An etch resistant layer may optionally be provided between the upper layer of insulator material and the gate material.
Abstract:
A lateral field emission display in which a cathode and anode are laterally arrayed, and a fabricating method thereof, since the micro tip is formed to be sharp through the reactive ion etching method, efficiency of electron emission is better than a conventional wedge-type tip. Also, since focusing of an electron beam is accurately controlled, a relatively low-voltage driving is possible. Further, since the first gate is further provided above the cathode and the anode is formed to be higher than the second gate, a trace control of an electron-beam emitted from the micro tip is easy and focusing efficiency of the emitted electron beam to the anode is also improved.
Abstract:
A virtual remote cathode has the position of a space charge cloud associated with it fixed by the geometry of a fixed insulating plate. The plate can be made to accurate dimensions and hence the cathode to control grid dimension can be accurately controlled and will not change as a result of any mechanical, electrical or physical changes in the construction. The fixed insulating plate is located on a surface of the control grid facing the cathode.
Abstract:
An electron source includes a negative electron affinity photocathode on a light-transmissive substrate and a light beam generator for directing a light beam through the substrate at the photocathode for exciting electrons into the conduction band. The photocathode has at least one active area for emission of electrons with dimensions of less than about two micrometers. The electron source further includes electron optics for forming the electrons into an electron beam and a vacuum enclosure for maintaining the photocathode at high vacuum. The photocathode is patterned to define emission areas. A patterned mask may be located on the emission surface of the active layer, may be buried within the active layer or may be located between the active layer and the substrate.
Abstract:
A display system comprises a display screen including a matrix of display elements and a permanent magnet having an array of channels formed therein. Each channel corresponds to a different display element. Each display element comprises a phosphor target, an electron source and a device for controlling flow of electrons from the source through the corresponding channel in the magnet onto the target. Addressing device comprises first and second orthogonal conductors defining a grid. Each display element is located at the intersection of a different pair of first and second conductors. Each first conductor is connected to a first control electrode of the control device of each display element in a corresponding line of display elements and each second conductor is connected to a second control electrode of the control device of each display element in a corresponding line of display elements.
Abstract:
An electron source having a cathode and a permanent magnet having perforated channels extending between opposite poles of the magnet. Each channel forms electrons received from the cathode into an electron beam for guidance towards a target. The electron source has applications in a wide range of technologies, including display technology and printer technology.