RU2173908C1 - Cathodic luminescent matrix screen - Google Patents

Abstract

FIELD: display engineering;. SUBSTANCE: proposed screen is designed for use in planar vacuum displays provided with electronic transistor system, filamentary cathodes, and flexible external leads and used to display information in the form of characters, signs, letters, and digits, namely alphanumeric, character-and-graphics, and television information for coding information color and synthesizing color in producing color screen. Screen has vacuum envelope incorporating face plate and insulating base; set of filamentary cathodes; row of anode electrodes deposited onto insulating base and made in the form of parallel phosphor- covered strips of at least one color which are connected by means of current-conducting tracks to external leads through contact pads; gate electrodes which are orthogonal to anode electrodes and form light- emitting segments; insulating frame that interconnects face plate and insulating base through sealed joint; projecting barriers made of insulating compound and arranged between anode electrodes to carry set of gate electrodes whose number depends on that of screen lines. EFFECT: enhanced reliability of screen and of gate electrode fixation in the latter. 1 dwg

Description

 The invention relates to indicator technology, and more particularly to a low-voltage vacuum (NKV) indicators with an electronic triode system with a direct channel cathode in a flat design with flexible external terminals, designed to display information in the form of symbols, signs, letters and numbers, namely, how alphanumeric, signographic, and television information with the ability to encode color information and synthesize color to create a full-color screen.

 Vacuum luminescent indicators are known, containing a vacuum cylinder, in which a circuit board is placed with anode electrodes located on it, which are coated with a phosphor, as well as a cathode, grids and external leads connected to the corresponding indicator electrodes (see BL Lisitsyn, Indication elements. M .: Energy, 1978, p. 60, 67; work by B.I. Gorfinkel. Sign-synthesizing electronics: low-voltage cathodoluminescence. Saratov University Press, 1993, p. 23, Fig. 2.6).

 The disadvantages of these devices is the presence of a complex system of control electrodes, made in the form of a large number of grid strips, which complicates their manufacture when using a volumetric vacuum cylinder and requires a large number of mounting connections.

A device for displaying information is described in RF patent N 1166628, MKI ⁶ : H 01 J 31/12 of 03/19/93, containing a vacuum cylinder consisting of a flat glass plate and a convex shell, anode segments with a coated phosphor layer and connecting conductors which are deposited on the board with a dielectric layer, as well as direct-channel cathodes and control electrodes, which are mounted on holders inside the container and connected to external terminals through contact pads by connecting conductors.

 The disadvantages of this device is the unreliability of the design due to the complex manufacturing technology.

The closest analogue in technical essence to the proposed solution - the prototype is the design of a multi-color screen matrix type, described in RF patent N 2137246, MKI ⁶ : H 01 J 31/12, 31/20, publ. September 10, 1999, containing a vacuum shell, a system of direct-channel cathodes, rows of anode strips deposited on an insulating base, coated with a phosphor and connected to current-carrying paths with external leads through contact pads, control electrodes forming light emitting segments at the crosshairs, and the anode strips are alternated by colors: red - green - blue (RGB), and the location zones of the set of external contact pads of the same color of the anode strips are made separate for each of the colors, and the number of of the zones at least matches the number of display colors, the length of the zone (l) determined by the number of contact pads (n), corresponding to the number of rows of a given color, and the pitch (t) of their location and satisfies l≥n • t.

 In the manufacture of a screen using existing technology, all control electrodes should ideally be in the same plane and at the same distance from the anode plate.

 Unfortunately, in real devices it is quite difficult to achieve the perfect geometry of the strips of the control electrodes relative to the anode board, and deviations from the ideal case take place in the manufactured devices.

 In addition, the design of the control electrodes in certain electrical modes is prone to the occurrence of undesirable phenomena, such as electromechanical resonance of individual control electrodes or a group of control electrodes; or a change in the pitch of the arrangement of the grid strips of the control electrodes due to elongation as a result of heating by the "own" current and heat radiation from the cathode system.

 The invention is as follows. The task to be solved by the claimed invention is directed is to increase the reliability of the screen, namely, to increase the strength of fastening of the control electrodes and, accordingly, to increase the reliability of the device and the quality of information display.

 The specified technical result during the implementation of the invention is achieved by the fact that in the cathodoluminescent screen of the matrix type, including a vacuum shell consisting of a front plate and an insulating base, a system of direct channel cathodes, rows deposited on the insulating base of the anode electrodes made in the form of parallel strips coated with a phosphor, according to at least one color, and connected by current-carrying tracks with external terminals through contact pads, a system of control electrodes orthogonal to the anode elec to the rods and forming light emitting segments, a dielectric frame hermetically connecting the front plate and the insulating base, 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 invention is illustrated by graphic material, an example of a specific implementation and description.

 The drawing shows a cathodoluminescent screen matrix type in section with protrusions-barriers according to the proposed technical solution.

In the drawing, the following notation:
1 - insulating base;
2 - front plate;
3 - dielectric frame;
4 - direct filament cathode system;
5 - anode electrodes made in the form of parallel strips;
6 - phosphor;
7 - a system of control electrodes;
8 - protrusions-barriers;
9 - contact pads;
10 - external findings.

 The drawing shows a cathodoluminescent screen of a matrix type in section with an insulating base 1 containing light-emitting anode electrodes strips 5 coated with a phosphor 6, a system of control electrodes 7 made in the form of strips (or rods) orthogonal to the anode electrodes 5 and forming in a crosshair light emitting segments. An insulating base 1 with deposited anode electrodes 5, a system of direct channel cathodes 4, a system of control electrodes 7 are placed in a vacuum shell consisting of a face plate 2, an insulating base 1 and a dielectric frame 3 located between them along the perimeter.

 The protrusions-barriers 8 are made of dielectric paste between the anode electrodes 5. On the protrusions-barriers 8 there is a system of control electrodes 7 according to the number of lines of the screen.

 The cathodoluminescent screen of the matrix type is as follows.

 The screen is controlled by supplying positive voltages to the corresponding control electrode system and anode electrodes. Non-working electrodes are supplied with a blocking voltage. The electrons emitted from the direct-heating cathode system 4 are scattered evenly over the area of the information zone (rows of anode electrodes 5 deposited on the insulating base made in the form of strips coated with a phosphor 6) using a system of control electrodes 7, to which a positive potential is applied, and coated phosphor 6 anode electrodes 5 in the information zone. Phosphor 6 begins to glow under the influence of electronic bombardment. Anode electrodes 5, on which there is no accelerating potential, are not affected by the electron beam, and the phosphors remain in an unexcited state.

 The present invention according to the proposed technical solution has been successfully tested in laboratory conditions. The protrusions-barriers 8 (see drawing) were made in the design of a prototype of a multi-color cathodoluminescent screen matrix type. However, the protrusion barriers with the same success were tested in a single-color screen. In this case, marriage due to the occurrence of electromechanical resonance of the control electrodes: sagging, bending, step change or deformation of the control electrode system was not observed. Using the proposed protrusions-barriers will solve the problem of creating highly efficient in brightness, reliability and efficiency cathodoluminescent matrix-type screens.

Claims (1)

 A cathodoluminescent screen of a matrix type, including a vacuum shell consisting of a front plate and an insulating base, a system of straight filament 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 and connected by current-carrying paths with external leads through pads, a system of control electrodes orthogonal to the anode electrodes and forming light-emitting segments, a dielectric frame, hermetically connected a front plate and an insulating base, characterized in that 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.