JPH0451436A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To change the emitted color of light easily using the same one display pattern by dividing one electrode constituting one display pattern into multiple fractions in the form of a loop or ring, forming two or more electrode groups from them, fitting each group with feeder wirings, and coating these electrode groups with fluorescent substance layer emitting different colors. CONSTITUTION:An Al film is formed on an insulative base board 1 and subjected to photolithographic process to yield the base of a fluorescent substance layer, and an electrode to constitute one display pattern is divided into multiple fractions in the form of a ring, and feeder wirings 21, 22 are connected alternately with multi-divided electrodes, and thus electrode groups 45, 46 are formed divided in two in electrical terms. An insulative layer 3 is applied to areas except the surfaces of these electrode groups 45, 46, and a green fluorescent substance layer 51, for ex., is formed on the surface of one of the groups while a red fluorescent substance layer 52 is formed on the surface of the other group. A grid 6 and filament 7 are arranged on this anode base board, and upon sealing fast with a cover glass 8, vacuum sealing is performed. The display color of this fluorescent character display tube can be varied by performing current feed to the feeder wirings selectively.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fluorescent display tube, especially numbers and symbols.

The present invention relates to a fluorescent display tube that displays patterns and the like by emitting light from a phosphor.

[Conventional technology]

Conventionally, a fluorescent display tube has an insulating substrate 1 as shown in FIG.
A power supply wiring 2 is formed on the top by Aρ or A, g, and an insulating layer 3 made of low melting point glass and colored pigments having through holes is provided thereon, and graphite powder and water are placed at positions corresponding to the through holes. Graphite layers mainly composed of glass are formed as graphite I to electrode layer 4,
Furthermore, ZnO: Zn
Phosphor layer (1) made of a (Zn, Cd) S:Ag, C4 type phosphor 51. (2) 52 was formed to serve as an anode substrate. Next, this phosphor layer (1) 51 (2>5
2, a grid 6 is arranged at an appropriate distance from the grid 6, a filament 7 is arranged at an appropriate distance from the grid 6, and the inner surface is coated with a translucent conductive film. A structure is provided in which the glass 8 is sealed with the anode substrate to form a vacuum-tight container.

In addition, in recent years, due to the need for high-density power supply wiring due to the complexity of displays and cost demands, as shown in Figure 4,
A which is the base of the power supply wiring 2 and the phosphor layer! 2 electrode layers 4] are formed on the insulating substrate 1 with sputtered films of A and Q, and then the insulating layer 3 is provided except for the surface of the Aρ electrode layer 41 at least in the portion where the phosphor layer is to be formed. ,Furthermore, this A,2
ZnO: Zn-based phosphor or (Zn,
Cd) SA, g, CI:! A phosphor layer consisting of a system phosphor (
1) 51, (2) 52 formed and used as an anode substrate,
As shown in Figure 5, in order to improve the visibility of the display,
A shown in Figure 4! The Ai electrode layer 4 made of the sputtered film of No. 2] is provided with striped light-transmitting windows, and this is used as the electrode layer 42 having the striped light-transmitting windows. 42'' Second phosphor layer (1) 51
．． (2>52 and has a structure in which the display consisting of luminescence of the phosphor is observed from the back side of the anode substrate, and in history,
As shown in FIG. 6, by using an IT○ film, which is a transparent conductive film, in place of the Aρ sputtered film for the power supply wiring 2 and electrodes shown in FIG. 4, a transparent conductive film electrode layer 43 is formed. Phosphor layer (1)51. (Some devices have a structure in which the display consisting of light emission of 2>52 is observed from the back surface of the anode substrate.

[Problem to be solved by the invention]

In each of these conventional fluorescent display tubes described above, one power supply wiring 2 is disposed on an electrode layer 14 forming one display pattern, as shown in FIG. 7, and one emission color is emitted on the electrode layer 14. Because it has a structure in which a phosphor layer made of phosphor is formed, when driven, it was possible to display only the two emitted colors possessed by the phosphor.

For example, if a conventional fluorescent display tube is used in a car's speedometer, the display is required to display green light up to 100 km/h and red light above 1100 km/h. It was physically impossible to arbitrarily produce two luminescent colors, green and red, with the same display pattern.

In addition, in order to eliminate these problems, the display pattern should be changed to
The dots are composed of so-called graphic dots, in which two different electrodes are coated with three types of phosphors that emit light in different colors (generally, those that emit light in red and green blue), or those that form a display pattern. Attempts have also been made to divide one electrode into multiple stripes and coat each of the multiple striped electrodes with phosphors that emit light in different colors, but the former method requires high-density power supply wiring and high altitude. phosphor coating accuracy is required, and it is used for car instruments and VT.
It is not at the practical stage of being used in general fluorescent display tubes such as R, and although the latter can change the color of the emitted light, it has an extremely complicated striped electrode and phosphor layer structure. Furthermore, it has been impossible to form a display pattern made of a phosphor layer without destroying the external shape of the display pattern.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display tube that can easily change the color of emitted light in the same display pattern.

[Means to solve the problem]

In the present invention, a power supply wiring and an electrode serving as a base for a phosphor layer are formed on an insulating substrate, and the phosphor layer coated on the electrode in a predetermined display pattern is caused to emit light by electron bombardment from a filament I. In a fluorescent display tube that obtains a display, one electrode constituting one display pattern is formed by dividing it into multiple sections, either a loop or a ring, and the divided electrode is divided into at least two electrode groups, and each electrode is divided into two groups. It has a structure in which independent power supply wiring is provided for each group, and a phosphor layer having a different luminescent color is coated on each of the electrode groups provided with the independent power supply wiring.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial plan view of a display pattern of a fluorescent display tube according to a first embodiment of the present invention, and FIG. 2 is a partial sectional view of the fluorescent display tube according to a first embodiment of the present invention.

As shown in FIGS. 1 and 2, first, sputtered films A and Q are formed on an insulating substrate 1 made of sortalime glass, and then a power supply wiring (a) is formed by a photolinkage method.
2 ], , (b) 22 and the electrode group <a> 45. which is the base of the phosphor layer. (b) 46 were formed all at once.

This electrode group (a) 4.5. (b) 46 and power supply wiring (a)
21. (b) As shown in Fig. 1, the electrodes 22 constituting one display pattern (in this case, each of the I3 characters) are divided into ring shapes with a line width of 0.1 mm and a line spacing of 0.1 m1n. power supply wiring (a) 21 and (b) 22.
is electrically divided into two electrode groups (a) 45. by connecting them alternately to the multi-divided link-shaped electrodes. (b)46
is formed.

Next, the electrode group (a) forming the phosphor layer (45° (1))
4.6 An insulating layer 3 made of low melting point glass and a colored pigment is coated on the entire surface of the electrode group (a), which is electrically divided into two.4.5. (b) Z n on one surface of 46
A phosphor layer ( ], ) 51 which is composed of an O.Zn-based phosphor and exhibits a green luminescent color.
d) A phosphor layer (2) 52 made of S:Ag, C4-based phosphor and exhibiting a red luminescent color was formed by photolithography.

A crit 6 and a filament 7 were disposed on the anode substrate thus obtained, and after sealing with a cover glass 8, vacuum sealing was performed to produce a fluorescent display tube.

In this fluorescent display tube, one display pattern consists of two ring-shaped electrical electrode groups formed with phosphor layers that emit light of different colors, and each electrode group is connected to an independent power supply wiring. By doing this selectively, it has become possible to easily change the display to three types: green only, red only, and a mixture of green and red.

Next, as a second example, A of the above-mentioned first example
Power supply wiring made of sputtered film of ρ (a>21, (b) 2
2. Electrode group (a) 4.5. (1)) Instead of 46, IT
Power supply wiring (a) 21. (b) 22 and electrode group (a) 45 (b) 46 were formed. Thereafter, an anode substrate was manufactured using the same method as in the first example.

The fluorescent display tube manufactured using this anode substrate is of the type in which the display is observed from the back side of the substrate, and as in the first embodiment, it is easy to display only clean, only red 1~, and a mixture of clean and red. It was possible to perform three types of display.

In the embodiment described above, the electrodes constituting one display pattern are divided into multiple link shapes, the link electrodes are electrically divided into two parts by two independent power supply wirings, and the emitted light of different colors is emitted on the electrode groups. The case where two phosphors are applied respectively has been described, but according to this embodiment, the electrode is divided into at least two electrode groups by dividing into a ring shape, and an independent power supply wiring is connected to each electrode group. It is also possible to electrically divide it into three parts, for example. Since this is a ring-shaped electrode, it is possible to divide one electrode into three parts more easily than in the conventional method in which one electrode is divided into stripes.

Further, the method of dividing one electrode forming one display pattern into multiple parts was not limited to a ring shape, but also a loop shape, and similar effects were obtained.

〔Effect of the invention〕

As explained above, the present invention forms one electrode, which is the base of a phosphor layer constituting one display pattern of a fluorescent display tube, into multiple segments into a loop or ring shape, and divides the multiple segmented electrodes into at least two or more electrodes. By dividing the electrode group into two groups, providing independent power supply wiring for each electrode group, and coating each electrode group with the independent power supply wiring, a phosphor layer having a different luminescent color is formed. This has the advantage that the display light color can be easily changed by a simple operation of selecting the power supply wiring to be energized.

In addition, the method of dividing one display pattern into loops or rings makes it easier to connect the power supply wiring to the electrodes than with other shapes of dividing methods (for example, stripes), and the electrodes are electrically divided into two or three. This also has the advantage that it can be easily manufactured by changing only the power supply wiring.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view of a display pattern of a fluorescent display tube according to a first embodiment of the present invention, FIG. 2 is a partial cross-sectional view of a fluorescent display tube according to a first embodiment of the present invention, and FIG. Figure 4,
Figures 5 and 6 are partial cross-sectional views of conventional fluorescent display tubes;
The figure is a partial plan view of a display pattern of a conventional fluorescent display tube. ]... Insulating substrate, 2... Power supply wiring, 3... Insulating layer,
4...graphite electrode layer, 51-...phosphor layer (
1), 52...phosphor layer (2), 6... grid, 7
...Filamen 1~. 8...Cover glass, 14...
- Electrode layer, 41... A (electrode layer, 42... electrode layer having a live transparent window, 43... transparent conductive film electrode layer, 21... power supply wiring a, 22... Power supply wiring b, 45
...Electrode group a, 46...One electrode group.

Claims (1)

[Claims] In a fluorescent display tube, a power supply wiring and an electrode as a base for a phosphor layer are formed on an insulating substrate, and the phosphor layer coated on the electrode in a predetermined display pattern is emitted by electron impact from a filament to obtain a display. , one electrode constituting one display pattern is multi-divided into either a loop or a ring, the multi-divided electrode is divided into at least two electrode groups, and each electrode group is provided with independent power supply wiring. A fluorescent display tube characterized in that the fluorescent display tube has a structure in which a phosphor layer having a different emission color is coated on each of the electrode groups provided with the independent power supply wiring.