JPS5920956A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To secure a fluorescent character display tube excellent in a standard of quality, by forming a conductive layer film unified with the inner part of a positive pole base plate, while impressing such voltage as being more positive than filament potential on this conductive layer film. CONSTITUTION:A conductor electrode part 26 is conducted outward by means of a feeding lead 27. The method of having a fluorescent character display tube composed of a suchlike costruction lighted and displayed is as follows that such voltage as being more positive than filament potential is fed to a conductive layer film 23 via the external feeding lead 27 and the conductor electrode part 26. With this method, since the display tube is lighted and displayed, even if a wiring conductor of the other segment anode impressed with negative cutoff voltage via an insulator layer passes through the lower part of segment anodes 7e and 7f lighting and displaying, the negative voltage charged to the insulator layer is discharged through the conductor electrode part 26 and the external feeding leed by the positive voltage of the conductive layer film 23 developed by this invention so that a ''display phantom'' never happens.

Description

[Detailed Description of the Invention] The present invention relates to the improvement of fluorescent display tubes that display information such as numbers, characters, symbols, and pictures using digital signals, and in particular to forming a conductive film inside the insulating layer of the anode substrate. This invention relates to a fluorescent display tube with improved display quality.

The general structure of a conventional fluorescent display tube is shown in FIG. 1(a).

As shown in (b), (C), and (d), wiring conductor groups 2a, zb, 2c...
2g, a power supply conductor terminal portion 5' is laminated simultaneously with the segment anode conductor 5 electrically connected to a predetermined wiring conductor group through the through hole 4 formed in the insulating layer 3. A phosphor layer 6 is laminated on the upper surface of the segment anode conductor 5, and a segment-electrode group 7at 7b, 7c...7
Then, a low melting point glass 8 is applied around the glass substrate 10 to complete an anode substrate 9 as shown in FIG. 1(b). A metal spacer 10 with a thickness of approximately 0.2 to 0.3 mm is disposed on the anode substrate 9, and a mesh-like spacer with a thickness of approximately 0.05 mm that does not disturb the normal display is placed on the metal spacer 10. Grid electrode group for accelerating and controlling metal, first grid 11. The second grid 12% and the third grid work 3 are resistance welded and fixed. Furthermore, the filament is located above the grid electrode group.
14 is commonly stretched across a plurality of segment anode groups and grid electrode groups.

An electrode assembly including an anode substrate, a spacer, a grid electrode group, and a filament is sealed with a glass substrate l by a cover glass 16 to which a spacer 15 is sealed and a low-melting glass 8 coated on the glass substrate, and then the electrode assembly is evacuated. be done. Here, the segment anodes 1 are each led out to the outside through the through holes 4 by the power supply conductor terminal portions 5' leads 17.

Further, the grid electrode group and the filament are also guided to the outside through leads 18 and 19, respectively, thereby obtaining a so-called dynamically driven fluorescent display tube 2o.

The segment anode group of a dynamically driven fluorescent display tube is connected in parallel with multiple wiring conductors at the relative positions of each digit, and in the case of a 9-day shape, generally one digit is connected to each digit as shown in Figure 1 (C) K.
The same segment anodes of 1, 12 and 13 are wiring conductor group 2a.
, 2b, 2c,... River and 2g are commonly connected,
Each segment anode is led out to the outside.

In such a fluorescent display tube, information is displayed by heating the filament and selectively applying voltage to the grid electrode and segment anode.

This will be explained in detail below with reference to the drawings.

FIG. 2 is a diagram showing the potential relationship between the anode and the grid electrode during lighting (display). As shown in the figure, filament potential E
. On the other hand, only the time t1 when the grid and the segment anode are at the positive potential E is lit (displayed), and the time t2 is not lit (erased). Therefore, the lighting time during one period T time (11+12) is only t1 time. The filament potential E is used to turn off the fluorescent display tube. A negative voltage must be applied to the grid (to erase the entire spar) or to the anode (to erase a particular segment anode within the field). This voltage is called cut-off voltage EK.

The potential E at this time is called the cut ψ off level. Therefore, if the grid or segment anode voltage is at the cut-off potential, the segment anode will not light up. FIG. 3 is a timing chart for lighting up the numbers in the example of the three-digit fluorescent display tube shown in FIG.

Here, the segments of the first grid 11 in FIG. 1(C) are timing e-charts showing a state in which the numbers "'-I J" are lit.

As is clear from FIGS. 1(C) and 3, the numbers [
"Segment 1" at the first grid position where "+" is lit Negative cut-off is applied to the wiring conductors 2f and 2g of the other segment anodes passing through an insulating layer below the anodes 7b and 7c. Voltage EK is applied. Negative cut-off voltages are applied to 2f at the bottom of the same anode 7b, 20 at the bottom of 7e, and 2e at the bottom of 70 of the third grid where the double digit is lit.

As a result, a negative cut-on voltage is charged to the insulating layer, and the "population" of this voltage causes light to emit light (display).
is inhibited, resulting in a negative force (as shown in the enlarged view of the fourth fixed part)
- If the light emission (display) of the segment anode part corresponding to the part on the wiring conductor to which the off-voltage is applied is weak, so-called [display shadowing] occurs, which significantly deteriorates the display quality. was present in conventional fluorescent display tubes.

As a measure for Ml to avoid this drawback, a structure has been proposed in which the width of the wiring conductor in the surrounding portion including the segment anode portion is narrowed, as shown in the enlarged view of the fifth fixed portion. However, this structure has the disadvantage that it cannot be made too thin due to current capacity limitations, and that making it too thin may cause wire breakage (due to dirt, etc.), requiring the installation of a special air-conditioned work room. was there. Therefore, as shown in the figure, 1
Although the display shadow 22 has been improved, the display quality is still low. Therefore, as a second measure, the segment anode conductor 5 is A structure has been proposed in which the segment anode 7b is protruded. According to the prototype experiments conducted by the present inventors, by setting the protrusion dimension L to 0.3 to 0.4 mm, the "display shadow" was improved and the display quality was significantly improved. However, it has been found that this structure also has the following drawbacks. In the 1st K, electrons were also incident on the segment anode conductor in the protruding portion, resulting in an increase in the segment anode current.

By the way, fluorescent display tubes can be driven at low voltages, have low power consumption, and are extremely bright and easy to see, emitting blue-green light. With the development of , LSI, and microcomputers, the scope of its application has expanded. In other words, the original use of fluorescent display tubes was to display relatively small numbers such as set numbers and calculation results on trains, but more recently, they have been used to display time on digital clocks, frequency and level displays on audio equipment, and tolls and numbers on electronic postcards. weight display,
ECR's amount display and K are pictorial displays in electronic games and toys, and the display contents (patterns) are becoming complex, large-sized, and complex displays.

On the other hand, the recent trend in electronic devices is toward lighter, thinner, shorter, smaller, and lower power consumption. In response to this trend, the increase in segment current not only goes against the trend toward lower power consumption in electronic devices, but also causes the display contents (patterns) of fluorescent display tubes to become larger (as mentioned above). The area of the segment anode is also large, so the current increases and ICφLS
I. Microcomputer direct drive is not possible, IC
・When installing a fluorescent display tube in a simulator device that requires a driver transistor/IC as an interface between the LSI/microcontroller and the fluorescent display tube, it goes against the trend of making it lighter and thinner and increases the cost.

Furthermore, the structure shown in FIG. 6 is complicated because the display contents (patterns) of the fluorescent display tube are complex and complicated.
The interval between the segment anodes is narrow, and the segment anode conductor tends not to be able to play a prominent role in the segment anode. As an example, FIG. 7 shows a part of the level display pattern, where the segment anode interval t is narrow (general K O, 5t
rvn (in many cases), it is impossible to make the segment anode conductor protrude from the segment anode.

The purpose of the present invention is to solve these drawbacks. In a fluorescent display tube which is connected to a conductive electrode part through a conductive electrode and provided with a power supply lead, a voltage higher than the filament potential is applied to the conductive layer film, thereby providing a fluorescent display tube with high display quality. It is in.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 8(a) is a perspective view of an embodiment according to the present invention, and FIG. 8(b) is an enlarged sectional view taken along line cc' in (3). In the figure, wiring conductor groups 2a, 2b, 2C,
...2g is formed. Next, a first insulating layer 3 with through holes 4 provided at predetermined positions is laminated on the wiring conductor group and the glass substrate, and then on this first insulating layer 3,
Avoiding the through holes 4, an integral conductive layer film 23 is formed in a range not exceeding the first insulating layer 3 using exactly the same method as for the wiring conductor group. Next, the first insulating layer 3 and the through hole 4 and a second insulating layer 25 having at least one through hole 24 at a different position from the through hole 4 are connected to the gt insulating layer 3.
on the first insulating layer 3 and the conductive layer film 23 in exactly the same manner as
The wiring conductor groups 2a, 2b are layered and coated on the second insulating layer 25 through the through holes 4 and 24.
, 2c, . . . 2g and the segment anode conductor 5 and conductor electrode portion 2 electrically connected to the conductive layer film 23
6 will be loaded at the same time. Incidentally, the segment anode conductor 5 has a phosphor layer 6 laminated on its upper surface, and a segment anode group 7a.
+7b+7c,...7g are formed. The subsequent manufacturing process is entirely the same as that of conventional fluorescent display tubes, but in the present invention, the conductor electrode portion 26 is connected to the power supply lead 27.
Externally derived. A method for lighting and displaying a fluorescent display tube having such a structure is to set the filament potential E shown in FIG. Supply positive voltage.

For example, the operation is exactly the same as that of a conventional fluorescent display tube, except that the external power supply lead 27 is connected to the DC power source of the electronic device (generally, the DC voltage is several volts higher than the anode supply voltage). According to the present invention, a fluorescent display tube having the above-described structure is lit up and displayed by the method described above, so that a negative cut-off voltage is applied to the lower part of the segment anode that is lit up through an insulating layer. Even if the wiring conductor of the other applied segment anode passes through, the negative voltage charged in the insulating layer is removed by the positive voltage of the conductive layer film according to the present invention, and the conductor electrode part and the external power supply lead. Since the discharge is carried out through the discharge, the display is not affected in any way and "display shadow" does not occur, making it possible to obtain a fluorescent display tube with high display quality.

In the above embodiments of the present invention, a dynamic drive type fluorescent display tube has been described, but it is clear that the present invention is not limited to only a dynamic drive type, but can also be applied to a static drive type fluorescent display tube.

As explained above, the present invention forms an integral conductive layer inside the insulating layer of the anode substrate, and connects the filament from the conductive electrode part and the power supply lead to the conductive layer through the through hole formed in the insulating layer. Since this is a fluorescent display tube that lights up and displays by applying a positive voltage to the potential, a negative cut-off voltage is applied to the anode of the segment that lights up through an insulating layer. Even if the wiring conductor of the segment anode passes through the lower part of the segment anode, the negative cut-off voltage charged in the insulating layer is transferred to the conductor in the conductive layer film integrally formed inside the insulating layer according to the present invention. Since a positive voltage is applied through the electrode section and the power supply lead, the die Φ is charged (discharged), so the segment anode that is lit is not affected by any negative voltage, and the display is very clear. A high-quality display can be obtained.

According to the present invention, there is no need to narrow the width of the υ wiring conductor, which is different from the conventional structure, and there is no restriction on current capacity, which is particularly effective for fluorescent display tubes with large-area segment anodes. There is no problem of wire breakage, and therefore there is no need to install a special air-conditioning work room.

Furthermore, since this structure is different from the conventional structure in which the segment anode conductor is provided protruding from the segment anode, the segment current does not increase, and therefore, driver transistors, ICs, etc. are not required even for large-area segment anodes. In addition to this, it is especially suitable for display contents (patterns) with narrow segment anode spacing.

The effect is great.

According to the above-described system, the present invention can be applied to fluorescent display tubes with complex, large-sized, and complicated display contents (patterns), which is a recent trend in fluorescent display tubes. Even if it is applied in a similar manner, it is possible to obtain a display with high display quality.

Moreover, when implementing the present invention, conventional equipment, materials,
Production technology can be used as is.

[Brief explanation of the drawing]

Figure 1(a) is a perspective view of a conventional fluorescent display tube, and Figure 1(b) is a perspective view of a conventional fluorescent display tube.
is an enlarged sectional view of the anode substrate taken along the A-A' cutting line;
C) is an enlarged cross-sectional view taken along the line A-A', excluding the cover glass portion, and FIG. 3D is a partially omitted plan view of FIG. FIGS. 2 and 3 are timing charts explaining the operation of the fluorescent display tube. FIGS. 4 and 5 are enlarged plan views of main parts of a conventional fluorescent display tube. FIG. 6(a) is an enlarged plan view of the main part of a conventional fluorescent display tube. 1(b) is an enlarged sectional view taken along the line BB' in FIG. 1(d). FIG. 7 is a pattern plan view of a fluorescent display tube. FIG. 8(a) is a perspective view of a fluorescent display tube according to the present invention. Figure (b) is an enlarged sectional view taken along line c-c' in figure (a). 1...Glass substrate, 2...Wiring conductor group, 3...Insulating layer, 4.24...Through hole, 5... Segment anode conductor, 6...
... Fluorescent material, 7... Segment anode group, 8.
...Low melting point glass, 9...Anode substrate, l
O...Metal spacer, 11.12.13...
... Grid electrode, 14 ... Filament, 15
...... Spacer, 16... Cover glass, 17.18.19.27... External lead for power supply % 20... Fluorescent display tube, 21. 22...
...Dark light emitting part, 23... Conductive layer film, 25
. . . second insulating layer, 26 . . . conductor electrode portion. Figure 1 ((1) (b) Roll 1 (C) Figure 1 (d) Figure 2 House Figure 3 11 1 Festival 4 Circle 4 (θ) A L 5th Figure A Circle (b) Tachibana 7th eye

Claims (1)

[Claims] A wiring conductor is placed on a glass substrate, and this wiring conductor and f! J
A fluorescent display tube comprising an insulating layer formed on the glass substrate, a segment anode conductor formed on the insulating layer and connected to the wiring conductor via a through hole, and a phosphor provided on the segment anode conductor. , an integral conductive layer film is formed inside the insulating layer avoiding the through-hole portion, and the conductive layer film is connected to a conductor electrode portion via the through-hole at at least one location to supply power to the conductor electrode portion. A fluorescent display tube characterized by being provided with a lead.