JPH0311535A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To vary the character width of a display pattern and one part of luminescent colors by multi-dividing an electrode serving as a base for fluorescent material layers that form the display pattern into an electrode consisting of a reduction pattern of the display pattern and an electrode consisting of double loop-shaped patterns surrounding the former electrode, and providing each electrode with independent feeder wiring. CONSTITUTION:A fluorescent character display tube comprises one display pattern formed in such a manner as being divided into a reduction pattern 45 located at its center portion that gives green-colored emission, double loop- shaped patterns 46, 47 surrounding the pattern 45, and a loop-shaped pattern 48 located at the outermost portion that gives red-colored emission, and each pattern is provided with independent feeder wiring 21-24. When the tube is driven the feeder wiring to which electricity is to be transmitted is selected to vary the character width of each segment of characters at four steps. Besides, electricity is transmitted to the loop-shaped pattern 48 located at the outermost portion so that a danger signal can be displayed by red-colored emission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluorescent display tube that displays numbers, symbols, designs, etc. by emitting light from a fluorescent substance.

[Conventional technology]

Conventionally, a fluorescent display tube has an insulating substrate 1 as shown in FIG.
A power supply wiring 2 is formed using A, i) or Ag on top, and an insulating layer 3 made of low melting point glass having through balls and a colored pigment is provided thereon, and graphite powder and hydraulic power are provided at positions corresponding to the through holes. A graphite layer mainly composed of lath is formed as a graphite electrode layer 4, and a phosphor composed of a ZnO:Zn-based phosphor or a (Zn, Cd)S:Ag, CI-based phosphor is further formed on the graphite electrode layer 4. Body layer (1)51. (2>52 is formed and used as an anode substrate, and then this phosphor!(1) 5 ], , (
2) Dispose a crit 6 at an appropriate distance at a position corresponding to 52, further dispose 7 on the filament 1 at an appropriate distance from the crit 6, and further coat a transparent conductive film on the inner surface. There has been provided a structure in which a cover glass 8 coated with is sealed to an 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,
The Aρ electrode layer 41, which is the base of the power supply wiring 2 and the phosphor layer, is
The Aρ electrode layer 41 is formed at once on the insulating substrate 1, and then the Aρ electrode layer 41 is formed at least in the portion where the phosphor layer is to be formed.
An insulating layer 3 is provided except for the surface, and the A and Q electrode layers 41 are further covered with ZnO: Zn-based phosphor or (Zn,C).
d) Phosphor layer <1>5 made of SAg, C, Q-based phosphor
1 (2>52) to serve as an anode substrate, or as shown in FIG. 5, a striped electrode layer made of a sputtered film of Aρ shown in FIG. A light-transmitting window of
A phosphor layer (1) 5], , (2>52) is provided on the phosphor layer (1) 5) to observe the display consisting of the luminescence of the phosphor from the back side of the anode substrate.
Also, as shown in Figure 6,
Connect the power supply wiring 2 shown in the figure to A! By using an IT'○ film, which is a transparent conductive film, in place of the Aρ sputtered film for the second electrode layer 41 and forming the transparent conductive source layer 43, the display consisting of the light emission of the phosphor can be realized from the back side of the anode substrate. Those with structures to be observed are also provided.

[Problem to be solved by the invention]

In all of these conventional fluorescent display tubes described above, as shown in FIG. ”−
Since it has a structure in which a phosphor layer is applied and formed on the phosphor layer, when it is driven, one display pattern can be lit or not.
In other words, only digital display of 0 or 1 was possible.

For example, when a conventional fluorescent display tube is used for the display section of temperature J1, 2 to 4 Japanese characters indicate 85°C. 150
It is only possible to display ℃, 5000C, etc., and only the magnitude of the numerical value expressed digitally. As with the display on a stick thermometer, it is difficult to make an analog judgment as to what the state is compared to Full 5 calls. In other words, 100°C, 200°C, 30
In addition to the digital display of the numerical value 0°C, an analog element is added to the display pattern size (character size) by 10 degrees.
The conventional structure has the disadvantage that it is not possible to change the temperature from 0°C to 200°C<3C).

Furthermore, there is a drawback that color display (particularly red color) indicating danger areas cannot be provided.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display tube capable of analog judgment and color display indicating danger areas in conjunction with digital display.

[Means to solve the problem]

The present invention forms power supply wiring and electrodes on an insulating substrate,
In a fluorescent display tube that obtains a display by emitting light from a phosphor layer coated on the electrode in a predetermined display pattern by electron bombardment from the filament 1-, one electrode constituting the display pattern has an external shape similar to the one display pattern. A reduced pattern electrode reduced in shape and a loop pattern electrode surrounding the reduced Bakun electrode at least once are formed by dividing into multiple parts, and an independent power supply wiring is provided for each electrode of the multi-divided @pole, and further , Z n having a clean emission color on at least the reduced pattern electrode among the multi-divided electrodes;
A phosphor layer made of O.Zn-based phosphor was formed by coating, and a phosphor layer made of <Zn, Cr1)S:Ag-based phosphor having a red luminescent color was formed by coating on the other loop-shaped pattern electrodes. It has a structure.

〔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.

In the first embodiment, as shown in FIGS. 1 and 2, a sputtered film of Aρ is formed on an insulating substrate 1 made of soda lime glass, and power supply wirings a, b, c, d2] 22.23.24 and electrodes a, b e d45 46.47 that serve as the base of the phosphor layer
．． 4.8 was formed all at once. These electrodes a, b, c, d
454.6 47 4.8 and supply wiring a, b, c, d2
], 22.23.24 are electrodes a, 45, which are made by reducing the electrodes constituting one display pattern (here, each sefmen l-" of the Japanese character) by Q, 3rn on one side from the original display pattern, and the pattern width. The electrode 1 has a triple loop pattern of 0.07 mm and an interval of 003 mm, and is divided into four parts: ) 46, electrode c47, and electrode d48, each of which is provided with an independent power supply wiring.

Next, electrodes a, b, c, d45.4 to which a phosphor layer is applied
6, 47. 48 An insulating layer 3 made of low melting point glass and colored pigment is coated on the entire surface of the electrode, and a reduced pattern electrode a45 and a loop pattern electrode b46 are formed in the four-divided electrode.
c47 each exhibits clean luminescence. ZnO:
Phosphor layers a, b, c51. made of Zn-based phosphor. −
1. ．． 51 2.51-3 was formed by photolithography. Further, on the loop pattern electrode d48, a phosphor layer d52 made of a (Zn, Cd)S:Ag-based phosphor that emits red light was formed by photolithography.

A lid 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 is divided into a reduced central pattern that emits green light, a double loop pattern surrounding it, and an outermost loop pattern that emits red light. By selecting the power supply wiring that is energized during operation, it is possible to change the character width of each segment of the Japanese character in four steps. By energizing the pattern, red-emitting danger signs are now possible. In other words, there is a digital display of the Japanese character pattern, an analog display based on changes in character width, and
A completely new display device has been obtained that combines three methods of transmitting information: danger display through partial changes in luminescent color.

Next, as a second example, A of the above-mentioned first example
Power supply wiring a, 1] c, d21, 2 made of ρ sputtered film
2, 23, 24 and electrodes a, bc, d45, 46, 4
In place of 7.48, the power supply wiring a, I), C, d2122.23.24 and the electrodes a, b are
, c, d45464.7.48 was formed.

Thereafter, the insulating layer 3. Phosphor layers a, bc exhibiting green light emission 51-1.
52-2.51-3,171~A phosphor layer d52 that emits light was formed and used as an anode substrate.

A fluorescent display tube of the type in which the display is observed from the back side of the insulating substrate manufactured using this anode substrate has a display based on the numerical value of the Japanese character pattern itself, as in the first embodiment.
By combining an analog display in which the character width of each segment of the Japanese character can be changed in four steps, and further changing the emitting color of a part of the display, for example, 0 ~ 99, 100 ~ 199
200-299 300-39 each character width is 4 columns 1
O ~ 99 < 1.00 ~ 199 < 200 ~ 2
99<300 to 39, and in the case of 300 to 39, it became possible to make the outer periphery of the pattern emit light.

In addition, 1st. In the second embodiment, a case has been described in which one display pattern is divided into four and phosphor layers of two types of emitted light colors are formed, but the number of divisions is not limited to two, and the number of emitted light colors is not limited.

〔Effect of the invention〕

As explained above, the present invention provides an electrode that serves as the base of a phosphor layer constituting one display pattern of a fluorescent display tube, in which an electrode is formed of a reduced pattern of the display pattern and an electrode that is formed of one or more loop patterns surrounding the electrode. By forming a multi-divided electrode, providing an independent power supply wiring for each electrode, and forming a phosphor layer having a different luminescent color on each of the multi-divided electrodes or on a predetermined electrode, This is a completely new display function that not only displays numerical values by combining lighting and non-lighting, but also changes the character width of the display pattern depending on the size of the numerical value, and also changes the emitting color of a part of the display. This has the effect of providing a fluorescent display tube with

[Brief explanation of 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, 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, Figure 5, Figure 6
Each figure is a partial sectional view of a conventional fluorescent display tube, and FIG. 7 is a partial plan view of an example of a display pattern of a conventional fluorescent display tube. 1... Insulating substrate, 2... Power supply wiring, 3... Insulating layer,
4. Graphite electrode layer, 6. Clid, 7. Filament, 8. Cover glass, 2], 2223.
24...Power supply wiring, 4]...Aρ electrode layer, 42...
- Electrode having a live light-transmitting window to S1, 43... Transparent conductive film electrode layer, 45, 46, 47, 4.8... Electrode, 51
．． 52...phosphor layer.

Claims (1)

[Claims] A display pattern is formed in a fluorescent display tube in which power supply wiring and electrodes are formed on an insulating substrate, and a phosphor layer coated on the electrodes in a predetermined display pattern is emitted by electron impact from a filament to obtain a display. One electrode is multi-divided into a reduced pattern electrode that is reduced to a shape similar to the external shape of the one display pattern, and a loop pattern electrode that surrounds the reduced pattern electrode at least once, and each of the multi-segmented electrodes is formed. Provide independent power supply wiring to the electrodes, and
A phosphor layer made of a ZnO:Zn-based phosphor having a green luminescent color is coated on at least the reduced pattern electrode among the multi-divided electrodes, and the other loop-shaped pattern electrodes have a red luminescent color. (Zn, Cd)
S: A fluorescent display tube characterized by having a structure in which a phosphor layer made of an Ag-based phosphor is coated and formed.