RU2172999C2 - Matrix-type multiple-color luminescent cathodic screen - Google Patents

Abstract

FIELD: display engineering; low-voltage data displays. SUBSTANCE: screen designed to display alphanumeric, character-andgraphical, and television information incorporating provision for color coding of information and color synthetization has vacuum envelope, set of filamentary cathodes, rows of anode electrodes applied to insulating base in the form of phosphor-covered strips alternating in colors (red R. green G, and blue B) within information region, current-conducting tracks, contact pads, modulating electrodes which are orthogonal to anode electrodes and form light-emitting segments at point of intersection; newly introduced in screen is region for chip assembly and soldering on glass (chip on glass) to control R, G, and B regions of screen; anode electrodes of one color are connected through current-conducting tracks and own contact pads to respective contact pads of chips on glass separated for each color (RR through R), (GG through G), (BB through B). EFFECT: improved ergonomic characteristics (chromaticity, color saturation, brightness of different colors, brightness and color contrast, angle of vision). 3 dwg

Description

 The invention relates to indicator technology, and more particularly to low-voltage means of displaying information based on cathodoluminescence, designed to display universal alphanumeric, signographic, and television information with the ability to encode color information and synthesize color to create a full-color screen.

 Multi-color vacuum-luminescent indicators (VLI) in the country and abroad are widely used in car dashboards, household radio equipment, multi-familiar displays for collective use, etc. (see B. Gorfinkel and others. Low-voltage cathodoluminescent indicators.- M .: Radio and communications, 1983, chapter II).

One of the significant drawbacks of VLI (including multi-color ones) is the presence of a “parasitic” contrast to the background (see Kolker V.E. et al. Electronic Industry, 1982, issue 506, pp. 138-142). This is due to the fact that the anode electrodes of the VLI are coated with a white phosphor with high reflectivity (reflection coefficient ρ _zn = 0.82), which significantly exceeds the reflection coefficient of the background surrounding the anode electrodes (ρ _zn = 0.08), and, therefore, the anode electrodes clearly visible in normal ambient light without giving them an electric mode.

 The well-known indicator IVLM2-5 / 7, described in the work of B. Gorfinkel. and other Low-voltage cathodoluminescent indicators.- M .: Radio and communications, 1983, p. 33, 88, 91, which contains a glass insulating board on which segments are applied - anodes coated with a phosphor. Anodes located on the same line are electrically connected and have one common output. Above the anodes located in one column, there is a common control electrode-grid and a direct-heating cathode. Thus, a matrix system with multiplex control along two orthogonal coordinates is formed. The whole structure is covered and sealed with a flat cylinder.

 Known low-voltage cathodoluminescent indicators, for example, IVLM2-5 / 7, are used to display alphanumeric and other information of two (or three) colors and is designed in such a way that each segment of the indicator information field is divided into two equal parts.

 When highlighting the information of each of the two colors in such indicators, only half of the segment area is operational, the second half of the segment does not work.

 When switching the displayed symbol from one color to another (for example, from green to red), the negative effect of "jumping" of the read symbol is observed. With a significant frequency of information change, the "jumping" effect contributes to the operator's fatigue and a decrease in his attention.

 In addition, such indicators do not allow the use of the entire working field of segments when working in the same color.

 To display universal, including graphic and television information, a continuous field of a multitude of light-emitting elements (SEE) is required, i.e. screen creation. The amount of SIE in the screen characterizes the amount of information displayed in the same way as radiation tubes (CRTs).

Недостатком данного технического решения является отсутствие многоцветности свечения.A known design of a multi-segment cathodoluminescent indicator described in the patent of the Russian Federation N 1166628, MKI: H 01 J 31/12, publ. 03/19/93, which contains a vacuum shell, a system of directly heated cathodes, rows of anode electrodes deposited on an insulating base, electrically connected to each other, grid modulating electrodes in the number of row anode electrodes located orthogonally to the anode electrodes and forming light emitting segments in the crosshair. The area of the “window” of the unit cell of the grid modulator electrode does not exceed the area of the anode electrode when the fill factor of the grid web is not more than 0.35, and the ratio of the distance from the grid modulator electrode to the anode electrode X _ca to the cell size d _{max is} selected from the expression

The disadvantage of this technical solution is the lack of multi-color glow.

 The essence of the technical solution is as follows. The objective of the present invention is to improve the ergonomic parameters of the cathodoluminescent screen of the matrix type: luminosity, color saturation, visible brightness of various colors, increasing luminance and color contrasts, viewing angle, reducing “spurious" contrast, and all this while reducing the material consumption of the dimensions of the indicator device, also simplifying design and increase the reliability and durability of the screen.

 The specified technical result during the implementation of the invention is achieved by the fact that a well-known matrix-type cathodoluminescent screen containing a vacuum shell, a system of straight filament cathodes, rows of anode electrodes deposited on an insulating base, modulator electrodes orthogonal to anode electrodes and forming light emitting segments in the crosshair, an additional zone for assembling and splitting crystals on glass to control a multi-color cathodoluminescent screen, and the anode electrodes are coated with phosphor A speaker with their alternating colors in the information zone: red - green - blue, while the anode electrodes of the same color are connected by current-carrying tracks through their own contact pads with the corresponding contact pads of the crystals on the glass, separated for each of the colors.

 The essence of the technical solution is illustrated by graphic materials, a description and an example of a specific implementation.

 In FIG. 1 shows a multi-color cathodoluminescent screen matrix type, General view.

 In FIG. 2 shows a general view of a matrix of a multicolor cathodoluminescent screen with crystals on glass (chip on glass).

 In FIG. 3 shows a diagram of the connection of the anode electrodes with current-carrying paths through their own contact pads with the corresponding contact pads of the crystals on the glass from only one bottom side of the anode plate - an insulating base with anode electrodes separate for each of the colors.

In the drawings, the following notation:
1 - a vacuum shell;
2 - insulating base;
3 - anode electrodes in the information zone;
4 - phosphor red (R) deposited on the anode electrodes 3;
5 - green phosphor (G) deposited on the anode electrodes 3;
6 - blue phosphor (B) deposited on the anode electrodes 3;
7 - straight cathodes;
8 - modulator electrodes;
9 - contact pads of the anode electrodes 3;
10 - crystals on glass (chip on glass);
11 - contact pads of crystals on glass for red anode electrodes [RR ... R];
12 - contact pads of crystals on glass for green anode electrodes [GG ... G];
13 - contact pads of crystals on glass for blue anode electrodes [BB ... B];
14 - current-carrying tracks;
15 - external leads of the anode electrodes of red color;
16 - external terminals of the green anode electrodes;
17 - external terminals of the anode electrodes in blue.

 A multi-color cathodoluminescent screen matrix type operates as follows.

 The electrons emitted from the cathode 7 are scattered evenly over the area of the information zone (rows of anode electrodes coated on the insulating base coated with a phosphor with alternating colors in the information zone: red - green - blue (RGB) using modulator electrodes 8, to which positive potential, and anode electrodes 3 covered with phosphors 4, 5, 6 with different colors of light are bombarded in the information zone, phosphors begin to glow under the influence of electronic bombardment. There is no accelerating potential, they are not affected by the electron beam, and the phosphors remain in an unexcited state.

 In this technical solution, the task is achieved by introducing crystals on the glass and changing the topology of the current paths connected through the own contact pads of the anode electrodes with the corresponding contact pads of the crystals on the glass, with the introduction of a protective layer of a dielectric, i.e., to introduce crystals with the corresponding contact pads on the glass separate for each of the colors [RR ... R], [GG ... G], [BB ... B], it is necessary to change the topology of current-carrying tracks (see Fig. 3).

 According to this technical solution, a multi-color cathodoluminescent matrix-type screen with crystals on glass (chip on glass) under the name 7``VFD (640x480) RGB was manufactured. When testing a prototype D-12 (640 RGB 480), the results exceeded all expectations.

 Using the proposed design provides, in comparison with the known designs of multi-color cathodoluminescent matrix-type screens, the following advantages: simplifies the external contact design of a multi-color cathodoluminescent matrix-type screen by reducing the number of external leads and, as a result, the number of voltage shapers in the switching circuit is reduced, which in turn leads to to reduce the overall dimensions of information display devices based on multicolor cathodoluminescent screens of matrix type.

Claims (1)

 A multi-color cathodoluminescent screen of a matrix type containing a vacuum shell, a system of direct filament cathodes, rows of anode electrodes deposited on an insulating base, modulator electrodes orthogonal to anode electrodes and forming light emitting segments in the crosshair, characterized in that an additional area for assembling and unwrapping crystals is inserted into it glass to control a multi-color cathodoluminescent screen, and the anode electrodes are coated with a phosphor with alternating colors in the information area: red - green - blue, while the anode electrodes of the same color are connected by current-carrying paths through their own contact pads with the corresponding contact pads of the crystals on the glass, separated for each of the colors.

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