RU2207657C2 - Vacuum fluorescent matrix screen - Google Patents

Abstract

FIELD: electronics; displays for television sets, matrix panels, and screens to display data in various individual and shared devices. SUBSTANCE: proposed screen with its vacuum-tight envelope accommodating cathode, anode, and linearly elongated X and Y signal electrodes has its envelope provided with glass plates, cathode filaments oriented along X axis, and anode provided with phosphor-covered film ribbons oriented along Y axis; one plate carries filaments and opposing plate, ribbons; X-signal source is connected to filaments so that the latter function as X signal electrodes; Y-signal source is connected to ribbons so that the latter function as Y signal electrodes; plate carrying filaments has boxes open to opposing plate; filaments are located in boxes; plates are abutting against each other within boxes. In addition depth of boxes provided in plate mounting Y electrodes is not greater than thickness of Y electrode and phosphor layers; filaments are activated and carry reduced filament yield films; filaments carry point structures based, for instance, on carbon; screen is provided with filament heating source. EFFECT: enhanced reliability, simplified design, long life of screen due to optimal geometry and fixation method of cathode relative to anode. 4 cl, 2 dwg

Description

 The invention relates to electronics, in particular to indicator displays, and can be used in the development of television receivers, matrix panels and screens for displaying visual information in various devices for individual and collective use.

 The constructive basis of a vacuum luminescent indicator device is an anode plate, which is a glass or ceramic substrate, on which conductive wiring is formed to supply voltage to the segments, the base of the segments with a luminescent layer, forming an indication pattern, contact pads for the installation of cathode grid fittings, getters, etc. . Important elements of the anode board that significantly affect the ergonomic characteristics of the device and the complexity of its manufacture are the conductive wiring and the base of the segments, which are faced with such requirements as low electrical resistance, the absence of wiring gloss, which makes it difficult to read information, ensuring the adhesion of the cathode phosphor layer, and the absence of diffusion poisonous impurities in phosphors, etc. (see Lisitsyn B.L. Display elements. - M.: Energy, 1978, p. 60).

 The disadvantage of this design is the complex manufacturing technology, as well as the high complexity of manufacturing both the anode plate and the cathode-grid reinforcement.

The closest analogue in technical essence to the proposed solution - the prototype is an indicator device containing a vacuum-tight shell, in which the cathode, anode and linearly extended signal X-, Y-electrodes are located, the shell is made with glass plates, the cathode is made with threads, oriented along X, the anode is made with film tapes coated with a phosphor, oriented along Y, one plate carries threads, and the opposite plate carries tapes, the X-signal source is connected to the threads, so that the threads are I signal X electrodes, Y-signal source is connected to the tape so that the tapes are signal Y-electrodes (see Japanese Patent Application 37935, IPC ^4:. H 01 J 31/12, publ 07.27.88 g.).

In the manufacture of the screen, the cathodes should be in the same plane and at the same distance from the anodes. Unfortunately, in real devices it is very difficult to achieve the same cathode distance relative to the anodes and deviations from the ideal case take place in the manufactured devices. In certain electrical modes, the design of the cathode assembly is prone to the occurrence of adverse events:
- the occurrence of electromechanical resonance of individual cathodes or a group of cathodes,
- elongation of the cathodes as a result of heating, which leads to short circuits.

 Thus, the disadvantage of this matrix vacuum luminescent screen is the unreliability and complexity of the design.

 The problem to which the claimed invention is directed is to increase the reliability and simplicity of a matrix vacuum luminescent screen, increase its durability (service life) by performing optimal cathode geometry relative to the anode and methods of its fastening.

 The specified technical result is achieved by the fact that in the known matrix vacuum luminescent screen containing a vacuum-tight shell, in which there is a cathode, anode and linearly extended signal X-, Y-electrodes, under the intersection of which luminous points are formed, the vacuum-dense shell is made with glass plates, the cathode is made with filaments oriented along X, the anode is made with film tapes coated with a phosphor oriented along Y, one plate carries threads, and the opposite plate does not there are tapes, the X-signal source is connected to the filaments, the filaments being the X-signal electrodes (so that the filaments are the X-signal electrodes), the Y-signal source is connected to the tapes, and the tapes are the Y-signal electrodes (so the tapes are signal U-electrodes), the plate carrying the threads is made with cameras open towards the opposite plate, the threads are located in the chambers, the plates are adjacent to each other in the place of the cameras.

 In addition, the threads are activated, they carry films of reduced work function of the threads; the threads carry point structures based on, for example, carbon; The matrix vacuum luminescent screen is equipped with a filament source.

 The invention is illustrated graphic materials.

 In FIG. 1 shows a cross-sectional matrix vacuum luminescent screen: view along the direction of the U-electrodes (or across the direction of the X-electrodes).

 In FIG. 2 shows a cross-sectional matrix vacuum luminescent screen: view along the direction of the X-electrodes (or across the direction of the U-electrodes).

In figures 1 and 2, the following notation is introduced:
1 - vacuum-tight shell
2 - cathode,
3 - anode
4 - linearly extended signal X-electrodes,
5 - linearly extended signal U-electrodes,
6 - source of X-signals,
7 - the source of the U-signals,
8 - phosphor,
9 - plate supporting the threads,
10 - the second plate of a vacuum-tight shell,
11 - cameras
12 - source of filament filaments.

 Matrix vacuum luminescent screen contains a vacuum-tight shell 1, in which are located the cathode 2, anode 3, linearly extended signal X-electrodes 4, linearly extended signal U-electrodes 5, the shell 1 is made with glass plates 9 and 10.

 The cathode 2 is made with threads oriented along X, the anode 3 is made with film tapes coated with phosphor 8 oriented along Y. One plate 9 carries threads, and the opposite second plate 10 carries tapes. The source of X-signals 6 is connected to the filaments, so that the filaments are signal X-electrodes. The source of U-signals 7 is connected to the tapes, so that the tapes are signal U-electrodes 5. The plate 9 carrying the threads is made with cameras 11 open to the side of the opposite plate 10. The threads are located in the chambers 11. The plates are adjacent to each other in place of the chambers eleven.

 The chamber spacing l - the row pitch is determined by the conditions of application of the matrix vacuum luminescent screen. The depth of the chambers h is calculated on the basis of the required parameters of the screen, taking into account the known laws adopted in the design of electronic devices.

 The operation of the matrix vacuum luminescent screen is as follows.

 Obtaining a luminescent image on the screen is achieved by the method of matrix formation from separate luminous points, each of which is obtained at the intersection of linearly extended signal X-electrodes 4 and linearly extended signal U-electrodes 5, which are currently simultaneously supplied with a positive potential. To stop the glow on the linearly extended signal X-electrode 4 serves a negative potential. Non-working electrodes are supplied with a blocking voltage. The electrons emitted from the cathode 2 are scattered evenly over the area of the information zone using linearly extended X-signal electrodes 4, to which a positive potential is applied and bombard anode 3 coated with phosphor 8. Phosphor 8 begins to glow under the influence of electron bombardment. Anodes 3, on which there is no accelerating potential, are not exposed to the electron beam, and the phosphors remain in an unexcited state.

 This invention has been successfully tested in the laboratory. The proposed design of a matrix vacuum luminescent screen is applicable both in a single-color vacuum luminescent screen and in a multi-color vacuum luminescent screen of a matrix type. Chambers 11 were made in the design of a prototype matrix vacuum luminescent screen. The cathodes are located in these chambers. In this case, marriage due to the occurrence of electromechanical resonance of the cathodes: sagging, bending or deformation of the cathodes was not observed, since the cathodes are stretched and rigidly fixed in the chambers.

 The inventive design of the matrix vacuum luminescent screen is intended to display any information in household and electrical equipment. The use of this invention will improve the reliability and durability of the screens.

Claims (4)

 1. A matrix vacuum luminescent screen containing a vacuum-tight shell, in which there is a cathode, anode and linearly extended signal X-, Y-electrodes, under the intersection of which luminous points are formed, the vacuum-tight shell is made with glass plates, the cathode is made with X oriented filaments, the anode is made with phosphor coated films, oriented along Y, one plate carries filaments, and the opposite plate carries tapes, the X-signal source is connected to the filaments, and the filaments are white X-electrodes, the source of Y-signals is connected to the tapes, and the tapes are signal Y-electrodes, characterized in that the plate carrying the threads is made with cameras open towards the opposite plate, the threads are located in the chambers, the plates are adjacent to each other place cameras.  2. The matrix vacuum luminescent screen according to claim 1, characterized in that the filaments are activated, carry films of reduced work function of the filaments.  3. The matrix vacuum luminescent screen according to any one of claims 1 and 2, characterized in that the filaments carry pointed structures based on, for example, carbon.  4. Matrix vacuum luminescent screen according to any one of claims 1 to 3, characterized in that it is equipped with a filament source.

Images