Abstract:
Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. Electrons are withdrawn from the ducts by means of an addressing system, whereafter these electrons are directed towards desired locations on the luminescent screen. An apertured spacer plate of electrically insulating material for passing electrons is arranged between the addressing system and the screen. To enable large voltage differences to be applied across the dimension of thickness of the spacer plate, the spacer plate is provided with a high-ohmic layer, or with a pattern of a low-ohmic material, or with an equalization layer at one side and with a low-ohmic layer at the other side, and at least the walls of the apertures are preferably coated with a material having a low secondary emission.
Abstract:
Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. Electrons are withdrawn from the ducts by means of an addressing system, whereafter these electrons are directed towards desired locations on the luminescent screen. An apertured spacer plate of electrically insulating material for passing electrons is arranged between the addressing system and the screen. To enable large voltage differences to be applied across the dimension of thickness of the spacer plate, the spacer plate is provided with a high-ohmic layer, or with a pattern of a low-ohmic material, or with an equalization layer at one side and with a low-ohmic layer at the other side, and at least the walls of the apertures are preferably coated with a material having a low secondary emission.
Abstract:
An image display apparatus in which luminance contrast is produced by the act of scanning of electron beams is disclosed. The apparatus of this invention includes: a screen including a plurality of picture elements each having a plurality of miniature luminescent units which respectively exhibit luminescence in response to the application of a plurality of electron beams, the picture elements being arranged in lines and columns; electron-beam generating means for generating the plurality of electron beams which respectively define the plurality of miniature luminescent units in each of the picture elements; control means for controlling emission of the plurality of electron beams so that the number of the miniature luminescent units which exhibit luminance in each of the picture elements may be controlled in accordance with a video signal; and/or means for controlling emission the period of time available for the emission of at least one of the plurality of electron beams.
Abstract:
Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. At a given resolution, hexagonal phosphor dot patterns in which dots are horizontally staggered generally produce fewer artefacts than in a 90.degree. tilted orientation. An addressing system for withdrawing electrons from the propagation ducts and for directing them towards the luminescent screen is preferably formed as a multistepped structure with a preselection structure of rows of preselection electrodes and a fine-selection structure of rows of fine-selection electrodes. To interconnect the fine-selection electrodes in parallel in a minimal number of groups, it is advantageous when the fine-selection electrodes are arranged parallel to the preselection electrodes.
Abstract:
A new scanning method and device for matrix panel display for using electron beam to scan comprising the steps: connecting each anode of dc matrix display panel to the display supply's anode via a switch cell whose status is controlled by electron beam, using one electron beam to irradiate to some anode; using another electron beam to irradiate to some cathode of the display panel; thereby selecting the unique display cell at the intersection of anode and cathode to light up; deflecting both beams accordingly to implement two-dimensional addressing; and adjusting beam current of the irradiating cathode to achieve image gray scale adjustment. The device using electron beam to scan for plasma matrix panel display, comprising a direct-current plasma display panel a plurality of display discharging cells formed at the intersections of the anodes and cathodes and switch cells formed at the intersections of the anodes and collection electrodes; two electron beam scanning, each comprising an electrode-any target screen where target electrodes are connected to display panel's anodes and cathodes, display supply whose output voltage is greater or equal to than the sum of the breakdown voltage of display discharging cell and the ionizing voltage of switch cell; and delay-circuit for longer pixel duty cycle. One electron beam seems anodes and closes the related switch cells to link display supply; another electron beam scans cathodes to make a unique moving display cell to emit light so as to realize two dimensional scanning and display.
Abstract:
Picture display device having a vacuum envelope with a front wall supporting a luminescent screen at its inner side and a rear wall at a short distance therefrom, connected by side walls. The envelope accommodates a plurality of adjacent electron sources and juxtaposed, local electron ducts cooperating with these sources and having walls of substantially electrically insulating material having a secondary emission coefficient which is suitable for transporting, through vacuum, produced electrons in the form of electron currents. Means are provided to make each electron current substantially travel along a particular wall of its electron duct, as well as means for withdrawing each electron current at predetermined locations from its duct and directing it towards the luminescent screen for producing a picture composed of pixels.
Abstract:
Electric discharge element comprising a cathode which cooperates with an electron duct cavity which is defined by walls of electrically insulating material having a secondary emission coefficient .delta., which cavity has an output aperture, while electrode means which can be connected to a voltage source are provided for applying, in operation, an electric field across a path in the cavity from the cathode to the output aperture so as to enable electron transport through the cavity.
Abstract:
In a cathode ray display tube including a screen carried on a flat faceplate of an envelope and a channel plate electron multiplier arranged parallel to, and spaced from, the screen having an input side across which an electron beam is scanned and an output side from which a current multiplied beam is directed onto the screen, the multiplier is supported away from the screen by a spacing frame engaging with the periphery of its output side and is clamped against the frame by a pressure member having a plurality of resilient fingers spaced at intervals around the edges of the multiplier and engaging with the input side thereof. In this way, minor local surface profile variations of the multiplier are accomodated. The fingers serve also as contacts for the input side electrode of the multiplier.
Abstract:
Apparatus and method for substantially equalizing the potential drop along a line cathode used in an electron beam source adapted for use in a flat display device. The apparatus and method ensure that electrons from a power source are fed through both ends of the line cathode, substantially simultaneously. Thereby, the potential drop along the axial length of the line cathode is decreased, improving the uniformity of brightness of the display.
Abstract:
A flat-type cathode ray tube is disclosed which comprises a flat tube envelope (1) in which first and second electrodes (2) and (3) are provided to face each other in the thickness direction of the envelope for presenting a first deflection system to perform an electrostatic deflection, a phosphor screen (4) is formed on the side of the first electrode (2), and a second deflection system (6) is formed between the first deflection system and an electron gun (5) to perform an electromagnetic deflection. A third electrode (10) sufficiently surrounding the region of the second deflection system (6) is formed integral with the second electrode (3) and the second and third electrodes (3) and (10) are supplied with a voltage lower than that of the first electrode (2). This flat-type cathode ray tube can reduce a power consumption and suppress a circular-arc distortion.