RU2258974C1 - Low-voltage cathode-ray fluorescent matrix screen - Google Patents

Abstract

FIELD: low-voltage vacuum cathode-ray data display means.

SUBSTANCE: proposed low-voltage cathode-ray fluorescent matrix screen that can be used in developing and manufacturing digital, alphanumeric, and mnemonic devices, matrix panels and screens for displaying information in various individual and shared devices, including television sets and radio systems has vacuum envelope incorporating two glass plates; cathode-emitters; lines of anode electrodes deposited on one of glass plates and made in the form of parallel phosphor-covered strips of at least one color which are connected by means of current-carrying tracks to external leads through contact pads; set of control electrodes which are orthogonal to anode electrodes and form light-emitting segments; and jointing component disposed over perimeter of two glass plates; control electrodes and cathodes are integrated to form single set of control electrodes and cathodes disposed on inner surface of second glass plate; carbon nanotubes are applied to set of control electrodes and cathodes for field-effect emission of electron flux when voltage is applied between chosen anode electrodes and at least one set of control electrode and cathode-emitter.

EFFECT: enhanced reliability of screen and relevant device, improved quality of data display, facilitated manufacture, and reduced cost.

2 cl, 3 dwg

Description

The invention relates to low-voltage cathodoluminescent vacuum means for displaying information and can be used in the development and production of digital, alphanumeric and mnemonic display devices, matrix panels and screens for displaying visual information in various devices for individual and collective use, including television devices and radio systems.

The structural basis of the vacuum luminescent indicator device is an anode plate, which is a glass or ceramic substrate, on which conductive wiring is formed to apply voltage to the segments, the base of the segments with a luminescent layer, forming an indication pattern, contact pads for mounting cathode-grid fittings, getters, etc. .P. Important elements of low-voltage cathodoluminescent matrix screens are cathode-grid fittings, getters that significantly affect the ergonomic parameters of the device and the complexity of its manufacture (see B.I. Gorfinkel, B.V. Abalduev, R. S. Medvedev, A.P. Loginov Low-voltage cathodoluminescent devices. M.: "Radio and communications", 1983, S. 33-36).

The disadvantage of this design is the presence of a system of cathodes and control electrodes made in the form of wire cloths, which complicates their fastening and requires a large number of mounting connections.

Vacuum luminescent indicators are known, containing a vacuum cylinder and a circuit board with anode segments located on it, which are coated with a phosphor, as well as cathodes, grids and external leads connected to the corresponding indicator electrodes (V. Lisitsyn. Display elements. M.: “Energy” , 1978, p. 60; Rusina EV, Matrix indicators and panels based on low-voltage cathodoluminescence No. 5-6, 1982, p. 88-89; RF patent No. 2179766, MKI 7: H 01 J 31 / 12, 1/15, 1/88, 29/02, publ. 02.20.2002).

The disadvantage of these devices is the presence of a complex system of control electrodes made in the form of a stretched large number of grid strips, while they are located at the same level of distance from the anode segments and at intervals between them, which narrows the ergonomic parameters of the indicator (overall brightness, viewing angle).

The closest analogue - the prototype of the invention is the design of the cathodoluminescent screen of the matrix type described in the patent of the Russian Federation No. 2173908, MKI 7: H 01 J 31/12, publ. 09/20/2001, including a vacuum shell consisting of a front plate and an insulating base, a system of direct-heating cathodes, rows of anode electrodes deposited on an insulating base, made in the form of parallel strips coated with a phosphor of at least one color, connected by current-carrying tracks with external leads through pads, a system of control electrodes orthogonal to the anode electrodes and forming light-emitting segments, a dielectric frame hermetically connecting the front plate and the insulating basis, between the anode electrodes are made of dielectric paste protrusions-barriers, on which the system of control electrodes is located according to the number of lines of the screen.

The disadvantage of such cathodoluminescent screens is the presence of a complex system of control electrodes, made in the form of a stretched large number of grid strips, which leads to unreliability of the structure due to the complex manufacturing technology.

The invention is as follows. The problem to which the invention is directed, is to increase the reliability of the screen and, accordingly, to increase the reliability of the device and the quality of the displayed information while significantly reducing the complexity of manufacturing the screen and its cost.

The specified technical result during the implementation of the invention is achieved by the fact that in the low-voltage cathodoluminescent matrix screen, including a vacuum shell, consisting of two glass plates, cathodes, rows of anode electrodes deposited on one of the glass plates, made in the form of parallel strips coated with a phosphor, at least , of the same color, and connected by current-carrying tracks with external leads through contact pads, a system of control electrodes orthogonal to the anode electrodes and forming emitting segments, a sealant located along the perimeter of two glass plates, control electrodes and cathodes are combined into a single system: control electrodes - cathodes, while control electrodes - cathodes are placed on the inner surface of the second glass plate, and carbon nanotubes are deposited on the control electrodes - cathodes the possibility of field emission of the electron stream when a voltage is applied between the selected anode electrodes and at least one control electrode — the emitter cathode.

In addition, spacers were additionally introduced, and the spacers are located between two glass plates with a certain step, and the spacers height determines the distance between the control electrodes - emitter cathodes and anode electrodes, and the field strength between the control electrodes - emitter cathodes and anode electrodes is within from 0.3 to 20 V / μm.

The invention is illustrated by graphic materials, an example of a specific implementation and description.

Figure 1 shows schematically a low-voltage cathodoluminescent matrix screen.

Figure 2 schematically shows a glass plate of a low-voltage cathodoluminescent matrix screen with anode electrodes coated with a phosphor coated on it, top view.

Figure 3 schematically shows another glass plate with control electrodes located on it - cathodes-emitters with carbon nanotubes deposited on them.

In the drawings, the following notation:

1 - low voltage cathodoluminescent matrix screen;

2 - a glass plate of a vacuum shell, for example front;

3 - a glass plate (other) of a vacuum shell;

4 - anode electrodes;

5 - phosphor;

6 - contact pads;

7 - external findings;

8 - spacers;

9 - control electrodes - cathodes-emitters;

10 - carbon nanotubes;

11 - sealant.

The work of the low-voltage cathodoluminescent matrix screen is as follows.

The screen is controlled by sequentially supplying in a pulsed mode a positive voltage to the corresponding anode electrodes 4 relative to the control electrode - the emitter cathode 9 with a duty cycle Q equal to the number of rows of the low-voltage matrix screen (line: control electrode - cathode-emitter). In the new low-voltage cathodoluminescent matrix screen 1, the control electrodes and cathodes are combined into a single system, forming control electrodes - emitter cathodes 9, made in the form of filaments with the application of carbon nanotubes 10. The electrons are pulled out of the control electrode - the cathode-emitter 9 and are scattered evenly according to the area of the included column (or row, respectively) of the information field, these are rows of anode electrodes 4 deposited on a glass plate 3 coated with phosphor 5 (see figures 1 and 2). The control of the light-emitting segment is performed due to the formation of the control electrode - the cathode-emitter 9 with carbon nanotubes deposited on them 10. The phosphor 5 begins to glow under the influence of electronic bombardment. Anode electrodes 4, on which there is no accelerating potential, are not exposed to the electron beam, and the phosphors 5 remain in an unexcited state, i.e. all other screen elements do not light up. So, the light-emitting segments located on the unselected anode electrodes 4 are at zero potential relative to the control electrode - the emitter cathode 9, and the electron beam to the light-emitting segments located at the intersection of the selected anode electrode 4 and the unselected control electrode - the cathode-emitter 9 is locked negative voltage applied to unselected control electrodes - cathodes-emitters 9.

The required image is obtained on the screen by applying voltage to the selected anode electrodes 4 and control electrodes — cathode-emitters 9 with carbon nanotubes 10 deposited on them.

The present invention has been successfully tested in the laboratory. Combined control electrodes and cathodes are located on the glass plate 2, forming control electrodes — cathodes-emitters 9, while carbon nanotubes 10 are applied to the control electrodes — cathodes-emitters 9.

Tests have shown that the present invention eliminates the undesirable disadvantages that occur in the screen:

- sagging, bending or deformation of both cathodes and control electrodes;

- simplification of screen manufacturing technology.

This invention allows to reduce the technological process in the manufacture of one device, as it excludes:

1) the process of manufacturing direct filament cathodes and, accordingly, the monetary costs of purchasing materials for direct filament cathodes;

2) a cathode holder and, accordingly, cash costs for the purchase of materials for holders;

3) installation work on the assembly of a fairly complex system of straight filament cathodes and control electrodes.

Thus, installation work on the assembly, manufacture and fastening of direct-heating cathodes, as well as mounted control electrodes in the claimed technical solution are excluded.

The introduction of spacers located inside the vacuum shell between two glass plates 2 and 3, can significantly reduce the thickness of the glass plates, respectively, reduce the weight of the screen, its material consumption, regardless of the size of the information capacity of the screen, increases its reliability and mechanical strength. The height of the spacers determines the distance between the two glass plates 2 and 3 and, accordingly, the distance between the control electrodes - cathodes-emitters 9 and anode electrodes 4.

When the device is in operation, the electric field between the control electrodes - the cathodes-emitters 9 and the anode electrodes 4 should be in the range from 0.3 to 20 V / μm. The indicated limits of the electric field between the control electrodes - the cathodes-emitters 9 and the anode electrodes 4 from 0.3 to 20 V / μm and the height of the spacers 8 are determined experimentally taking into account the well-known laws adopted in the design of electronic devices with field emission.

The use of control electrodes - cathodes-emitters with carbon nanotubes deposited on them and located on a glass plate of a vacuum shell, will solve the problem of creating a highly effective low-voltage cathodoluminescent matrix screen in terms of brightness, reliability and economy.

Claims (2)

1. Low-voltage cathodoluminescent matrix screen, including a vacuum shell, consisting of two glass plates, cathode emitters, rows deposited on one of the glass plates of the anode electrodes, made in the form of parallel strips coated with a phosphor of at least one color and connected by current-carrying tracks with external leads through contact pads, a system of control electrodes orthogonal to the anode electrodes and forming light-emitting segments, a sealant located around the perimeter of two glass x plates, characterized in that the control electrodes and cathodes are combined into a single system: control electrodes-cathodes, while the control electrodes-cathodes are placed on the inner surface of the second glass plate, and carbon nanotubes with the possibility of field emission of electron flow are deposited on the control electrodes-cathodes when applying voltage between the selected anode electrodes and at least one control electrode-cathode-emitter. 2. The low-voltage cathodoluminescent matrix screen according to claim 1, characterized in that the spacers are additionally introduced, wherein the spacers are located between two glass plates with a certain step, and the spacers height determines the distance between the control electrodes-cathodes-emitters and anode electrodes, and the field strength between the control electrodes-cathodes-emitters and the anode electrodes in the range from 0.3 to 20 V / μm.

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