Abstract:
A gas discharge display device has a hermetically sealed gas filled envelope having an anode plate on one interior side and a profiled cathode on an opposite interior side. A control plate having a conductor matrix thereon formed of row conductor runs on one side and column conductor runs on an opposite side with perforations in the plate disposed at row-column intersections is disposed inside the envelope parallel to the anode and cathode and divides the interior of the envelope into a post-acceleration area near the anode and a discharge area near the cathode. The cathode profile is a plurality of spaced ribs disposed parallel to at least one set of conductor runs on the control plate. Upon cathode energization, gas electrons are ionized on that part of the cathode confined by neighboring ribs and opposite to air charged conductor on the control plate and subsequently drawn to the anode plate through the matric holes to display a point-form image. By confining the gas discharge to the vicinity of a small number of conductor rows, unwanted background luminosity is substantially minimized on the display screen.
Abstract:
A plasma display device is provided with a gas discharge device which is filled with hydrogen as an ionizable gas and contains an aluminum cathode which is maintained continuously coated during the gas discharge with a film of an aluminum oxide which is either resistant to the hydrogen gas discharge, or the non-resistant portions of which are re-formed into the oxide by means of an additive. This plasma display device can be provided for flat picture screens, particularly of television sets, because during the required life of the gas discharge device, a premature rise of the operating voltage is prevented and, at the same time, there is little sputtering effect.
Abstract:
An improved display device of the Type using a self-sustained discharge as a source of electrons for cathodoluminescence is operable at relatively greater pressures so as to lower the necessary striking potential to the Paschen minimum and includes an improved grid structure for selectively controlling the transport of electrons from the sustained discharge to a high voltage screen, and constructed so as to limit positive ion space charge formation therebetween.
Abstract:
A display panel has a gas-tight envelope, two planar main electrodes which are arranged in the envelope parallel with each other, one of which is a cold cathode in the form of a metal plate and the other is an anode in the form of a metal screen, and a cathodeluminescent panel consisting of a transparent electrode coated with a phosphor layer, which is positioned behind the anode.
Abstract:
This disclosure depicts cathodo-luminescent devices utilizing a gas discharge as the source of electrons, and television display apparatus employing an X-Y matrix of such devices as the picture elements. In each embodiment illustrated, the cathodo-luminescent display devices are depicted as each comprising a two-section gas cell. A gas discharge, serving as the electron source, is established in a first section between cathode means and anode means. Free electrons generated in the first section are drawn through openings in the anode means by a high gradient field in a second section and accelerated into impingement with a phosphor disposed on a viewing screen. Establishment of a gas discharge in the second section is precluded by appropriate selection of certain dimensions, gas pressure and accelerating voltage according to Paschen''s law. Moderating means is provided in certain embodiments for causing the energy range of free electrons entering the second section to be narrow relative to the range of energies of free electrons generated in the gas discharge. A number of control grid arrangements and other features and details are disclosed.
Abstract:
A display device comprising means for forming a discharge space including a plurality of discharge electrodes constituting an electron source, a plurality of first control grids arranged in parallel for controlling the electron beam generated from the discharge space, a plurality of second control grids arranged in parallel with each other and at right angles to said first control grids, means for accelerating the electron beam controlled by said first and second control grids, a phosphor illuminated by the impingement thereupon of the accelerated electron beam, means for applying to said second control grids pulse voltages in sequence, means for applying a pulse voltage to said discharge electrodes to effect a discharge only in the space corresponding to the control grid to which the pulse voltage is applied, and means for applying a pulse-width-modulated voltage to said first control grids.
Abstract:
A display device having an inert gas-filled, transparent envelope, containing a set of parallel cathode elements an anode grid structure forming a venetian blind type structure and a glass support plate carrying a set of parallel conducting strips perpendicular to the plane of the parallel cathode strips and coated with a layer of ZnO phosphor. Light is emitted by the phosphor when one of the cathode elements is connected to a negative potential, the anode grid structure connected to a ground potential and one of the phosphor bearing conducting strips is connected to a low positive signal voltage. Color displays may be generated by applying a series of phosphors which generate different colors in an alternating fashion on the glass support plate.
Abstract:
A flat gas discharge display includes a gas-filled envelope having mutually parallel front and rear wall plates disposed one behind the other as seen in a given viewing direction, at least one relatively large area cathode disposed on the front side of the rear wall plate, a cathodoluminescent layer and an anode disposed on the rear side of the front wall plate, a control unit disposed between the wall plates including front, central and rear grid electrodes each formed of a group of mutually parallel strip conductors, the strip conductors of the central grid electrode being column conductors, the strip conductors of the rear grid electrode being row conductors forming an orthogonal matrix together with the column conductors, and the strip conductors of the front grid electrode being tetrode conductors extended parallel to the row conductors and crossing the column conductors at given locations, the control unit being perforated with canals at the given locations where the tetrode conductors and column conductors cross each other, the row conductors each including n adjacent rows of channels, where n is an integer greater than one, and pairs of directly adjacent tetrode conductors disposed in front of different row conductors being combined to form a single strip conductor.
Abstract:
Gas discharge display device having a vacuum-tight envelope with a front and back plate. A control unit divides the interior of the envelope filled with gas into a back and front space. The back space has at least one plasma cathode and at least one plasma anode. The front plate carries a cathodoluminescent layer and a layer electrode. The control unit contains at least one electrode plane extending parallel to the wall plates, with at least one conductor. In operation a gas discharge burns between the plasma electrodes. The distance between the post-acceleration anode and cathode is small such that no gas discharge is ignited in the post-acceleration space. The post-acceleration cathode is coated with an implantation protection layer of a high-melting metal to maintain the operating voltage constant under continuous load.
Abstract:
A flat electron beam tube includes a gas-filled enclosure containing two mutually parallel front and rear plates, a control plate subdividing the enclosure and extending, parallel to the front and the rear plates, into a front chamber, a post-acceleration space, and a rear gas discharge space; the rear plate carrying a gas discharge cathode on an inner side thereof; the front plate carrying a luminescent layer excitable by electrons and a post-acceleration anode; the control plate carrying mutually parallel strip-shaped row conductors, and being formed with a number of regularly arranged electron inlet openings and mutually parallel, strip-shaped column conductors, and being formed with a number of regularly arranged electron outlet openings, the column conductors being disposed crosswise to the row conductors, and the electron outlet openings being associated, respectively, by means of cutouts formed in the control plate, with given electron inlet openings; the row conductors being connected successively to a potential more positive than the potential of the gas discharge cathode so that an electron-supplying gas discharge burns between the opposite gas discharge cathode and the connected row conductor; mutually associated electron inlet openings and electron outlet openings being disposed in non-overlapping relationship in a direction perpendicular to the plane of the front and the rear plates; and the column conductors being always at a potential more negative than that of the row conductor being then connected.