Abstract:
A cathode unit, comprising one or more cathodes deflection means and a row of electron multipliers, is arranged on an end wall of a flat display device. If necessary, the cathode unit may be manufactured as a separate unit.
Abstract:
A plate-type cathode ray tube device is disclosed in which a plurality of electron beams are emitted in directions parallel to a fluorescent screen, each of the electron beams is so deflected as to be perpendicular to the fluorescent screen, and performs a scanning operation in a direction parallel to the initial direction of the electron beam, a deflection voltage for deflecting each electron beam and for causing each electron beam to perform the above scanning operation is applied to one of a plurality of deflection plates which is juxtaposed in a direction parallel to the initial direction of the electron beam and each of which extends in a direction perpendicular to the initial direction of the electron beam, in such a manner that the deflection plates are successively applied with the deflection voltage, and a focusing correction voltage for keeping the size of electron beam spot formed on the fluorescent screen constant all over the fluorescent screen is applied to one of the deflection plates at the same time the deflection voltage is applied to a different one of the deflection plates.
Abstract:
In order to reduce contrast degradation in an electrostatically scanned flat cathode ray tube having a channel plate electron multiplier due to back-scattered electrons entering channels remote from their origin, steps are taken to restrict the acceptance angle of the channel plate electron multiplier. In one arrangement means are provided on the input surface to restrict the angle of entry to a range normally associated with the addressing electron beam. In another arrangement the ready emission of secondary electrons is restricted to a predetermined arcuate portion of the input of each channel of the electron multiplier. In either arrangement stray electrons are unable to impinge upon the secondary emitting material in the channels and in consequence produce many fewer back-scattered electrons. Optionally a material having a low back-scatter coefficient and a microscopically rough surface texture may be applied to the exposed surfaces, apart from the apertures, of the input side of the electron multiplier to reduce the number of back-scattered electrons.
Abstract:
A monotube CRT includes an envelope which comprises a first section that houses the electron gun and a second section that houses a fiber optics faceplate along a sidewall. An array of electromagnets is disposed along the second section for deflecting the electron beam from its longitudinal path through the envelope transversely to trace a linear scan on the faceplate. The first section of the envelope is a circular cylinder whose axis is coaxial with the longitudinal path of the electron flow. The second section of the envelope is essentially rectangular or elliptical in cross section and the undeflected beam flows adjacent one narrow sidewall opposite the sidewall housing the faceplate. Each electromagnet of the array includes a core portion adjacent said one narrow sidewall and pole pieces that flank the wide sidewalls of the section.
Abstract:
A structure for converging electrons at the screen of a flat panel display and for transversely scanning electrons across the channels of the display includes a plurality of conductive strips arranged between the acceleration mesh and the phosphor screen. The strips extend longitudinally along and are substantially parallel to the acceleration mesh and are also substantially parallel to one another. A first portion of the strips is voltage biased to converge electrons in the proximity of the screen and scan said electrons transversely across the channels and the other portion is voltage biased to scan the electrons transversely across the channels.
Abstract:
A beam guide assembly for a flat panel display device includes a plurality of meshes arranged in a spaced parallel relationship. Insulative supports permanently retain the meshes in a desired spaced relationship. Shields are arranged between the various meshes to shield the beam guide assembly from external electric fields and to prevent the insulative supports from being charged by stray electrons and deleteriously effecting the paths of the electron beams.
Abstract:
An electron beam injection structure for flat panel display device includes electron injection electrodes which span a beam guide assembly for propagating electron beams. One end of the electron injection electrodes is in closer proximity to the cathode than the corresponding end of the beam guide structure. The injection of electrons from the cathode to the beam guide structure therefore can be maximized by increasing the voltage on the electron injection electrodes while permitting changes in the operating voltages applied to the beam guide structure and other elements of the display device.
Abstract:
A thin kinescope has the electron gun positioned to emit electrons so that the initial direction of travel is substantially parallel to the plane of the screen. A bowl-shaped reflector is positioned to bend the electron beams toward the screen and to improve the focusing of the electron beams. A unique combination of deflection enhancement and a shunted quadrupole result in maximum deflection so that the entire screen is scanned by the electron beams.
Abstract:
A cathode ray tube is disclosed which is relatively flat in the viewing direction, including a transparent envelope having at least one generally flat section, a screen arranged within the envelope, an electron gun for projecting an electron beam along a path substantially parallel to the plane of the screen, and first and second deflecting means for causing the beam to scan a line and a frame, respectively, characterized by the provision of a single conductive member of a given potential forming a beam directing electrode spaced from the screen and arranged such that the path of the electron beam lies between the electrode and the screen.
Abstract:
An envelope of a display device includes a rear wall and a front wall having a cathodoluminescent screen thereon. Within the envelope are a plurality of electron beam guides and means for extracting electron beams out of the guide at various points. The electron beam guide comprises a first guide grid parallel to and spaced from the rear wall and a guide grid structure between the first grid and the front wall. Although there are unequal electric fields on the front and rear sides of the beam guide, the first guide grid and the guide grid structure maintain symmetry of the electric fields within the guide.