JPS587013B2 - flat display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat display tube, in which two substrates, for example, are faced to each other, the peripheral portions of which are sealed with a glass frit, etc., to form a flat tube, and parallel anode electrodes are provided on the inner surfaces of both substrates. and parallel cathode electrodes are arranged so as to extend in a direction that intersects with each other,
The present invention relates to a flat display tube that performs display by emitting light due to a discharge generated at the intersection of both electrodes or by emitting light excited by ultraviolet rays generated by the discharge.

In order to facilitate understanding of the benefits and features of the present invention, first,
An example of this type of flat display tube, particularly a conventional color fluorescent discharge display tube, will be explained with reference to FIGS. 1 and 2.

In this case, the two substrates 2 and 3 constitute the flat tube 1.

These substrates 2 and 3 are composed of insulating substrates, such as glass plates, and at least one of the substrates, for example substrate 3, is transparent or semi-transparent, that is, light transmissive.

Both substrates 2 and 3 are placed facing each other, and their peripheral portions are sealed with, for example, a glass frit 4.
A flat space 5 is formed between and 3.

On the inner surface of one substrate 2, a plurality of parallel cathode electrodes Y1+Y2, Ys, .

Further, on the same inner surface of this substrate 2, there are insulating electrodes made of, for example, glass extending across the electrodes Y1, Y2, Y3, etc. arranged in the same direction. Projection g. , g2, g3, . . . are formed with predetermined intervals maintained.

The height of these protrusions g1sg2+g3 . . . is selected in accordance with the distance between both substrates 2 and 3.

Further, on the inner surface of the other substrate 3, each protrusion g. l
Each protrusion g1+ is placed at a position opposite to g21g3...
Parallel barrier electrodes s1, s2, s3..., extending along the extending direction of g21g3..., are arranged and formed, and each barrier electrode s1, s2, s3...
- Parallel anode electrodes X1yX2yX3 extending along the extending direction of these barrier electrodes are arranged in between.

One end of each of the barrier electrodes S1+52+S3 .

Further, one end of each of the parallel anode electrodes X1, X2, X3, . . . is extended to the other side edge of the substrate 3, and a terminal portion 8 is formed respectively.

Then, a phosphor is coated on both sides of each parallel anode electrode X1rX2pX3....

For example, a red phosphor PR is applied on both sides of every second anode electrode XIyX4yX7 along the direction of its extension,
Green phosphor PG is coated on both sides of every other two electrodes X2yX5, A blue phosphor PB is coated.

The substrates 2 and 3 have insulating strips g1, g2, g3... as electrodes.
1j S2+S3..., facing or opposite to, an insulating strip g
The distance between the substrates 2 and 3 is determined by the thicknesses of the substrates 1, g2, g3, .

In this way, the space 5 is divided by the insulating strips g1+g2ygs, . . . with respect to the electrodes X1, X2, X3, . . . to form strip-shaped spaces a1ra2, a3, .

These spaces al+a2+a3 . . . separated by the insulating strips g1+g2, gs .

The space 5 is evacuated and a rare gas is filled in at a required low pressure.

In this way, at the intersection of each parallel anode electrode X1yX2sX3... and parallel cathode electrode y1, y2, y3...,
A discharge portion is formed respectively.

That is, the drive circuit 10 causes each parallel cathode electrode y1yy
For example, from an off potential of 100 V, an on potential of 0.times.2 pys is sequentially applied in a time-division manner.

On the other hand, each anode electrode XltX2,
200 to 2 depending on the display signal sequentially or simultaneously to 3...
Applying a voltage of 50cm, this electrode X1+X2+X3...
...and the electrodes y,, y2, y3... to which an on-voltage is applied, a discharge is generated at the discharge section, and the ultraviolet rays generated by this discharge section are attached to the vicinity of this discharge section. Excite and emit fluorescent substances PR, Po, and PB,
Light is emitted with a brightness depending on the magnitude of the potential difference according to the display signal between both electrodes X1sX2, An image is obtained and observed from the outside of the substrate 3.

Note that the barrier electrodes s11S21s3... are connected to the DC power supply 12.
A constant DC voltage of 100 V is applied from approximately the middle potential of the discharge voltage to the cathode electrodes y1, y2, y3 to which the on-voltage is applied.
The insulating protrusions g1,g prevent the glow from spreading along...
2, g3..., and the ions and electrons are repelled or attracted by this electrode S1+S2yS3..., and the charge is lost here or on the inner surface of the nearby substrate, preventing their diffusion and preventing crosstalk. I'm trying to prevent it.

According to the display tube configured as described above, the two substrates 2 and 3
Since the display tubes are combined in a state where they face each other, a flat display tube is constructed as a whole. Therefore, it is necessary to match the protrusions such as the insulating strips gt+g2+g3... and the barrier electrodes s1, S2, S3... in a state where they abut each other, and in this case, the space 5 between both substrates 2 and 3 must be Therefore, when performing exhaust, both boards 2
and 3 are attracted to each other by the negative pressure in the space 5, so that the protrusions or insulating strips gt, g that are to abut against each other
2, g3... and barrier electrodes S1+S2+S3... are each relatively narrow and have rounded tops, so barrier electrodes s,, s2 are formed between the insulating strips g1, g2, g3...
, s3 . . . may slip down, causing misalignment between the substrates 2 and 3.

Incidentally, the barrier x-poles s, lS21s3... are actually formed by the printing method using conductive paint like other electrodes, and since they need to be formed as narrow patterns, they are also It is formed as a protrusion with a rounded top.

In addition, in such a display tube, in order to prevent the frit 4 from entering the space 5 and flowing into the display section when the frit 4 is attached, the frit 4 is attached to the substrate 3 as shown in FIG. 2, for example. An annular groove 14 is formed inside the outer periphery to be fritted to prevent the frit 4 from flowing in.

Furthermore, the examples shown in FIGS. 3 to 6 show other examples of conventional flat display tubes. In this case, a plurality of parallel cathode electrodes y1, Y2jY3... are arranged in one direction on the substrate 2 as in the above-mentioned example, and these electrodes are arranged, for example, in a direction orthogonal to these electrodes yt1y21Y3... Across, insulating strips g1, g
2+g3... are arranged in a deposited arrangement.

On the inner surface of the other substrate 3, anode electrodes X1 and X2 are provided.
, and a power supply section 22 that supplies power thereto.

That is, the electrode ylIy has a plurality of discharge parts 21 scattered in an island shape.
21Y3... are disposed in the extension direction (hereinafter referred to as the row direction) and in a direction substantially perpendicular thereto (hereinafter referred to as the column direction), and the discharge parts 21 arranged on a common column are connected to a common power supply part. 22, and configure electrodes x, lX2, x3, . . . for each power feeding section 22.

Each power feeding section 22 is arranged and formed with a required spacing in the column direction.

Further, the power feeding section 22 on the substrate 3 is arranged so as to face each insulating strip gtIg21g3 . . . on the substrate 2.

Each discharge section 21 is connected to each electrode y1 from each corresponding power supply section 22.
, y2, y3, . . . may be formed into a band shape, for example.

Further, these discharge portions 21 are connected to each electrode y. IV21ya..., that is, when viewed from the outer surface of the substrate 3, each electrode yt
They can be formed so as to coincide with lY2+Y3..., but they can also be formed so as to be close to each electrode ytlY21ys... as in the illustrated example, but not coincident with these.

Then, the discharge portion 21 of these electrodes X1+X2rX3...
At least a part of the power supply section 22 is left exposed, and other parts, particularly the power supply section 22, are covered with an insulating material 23 such as glass.

In this case, the heights of the insulating material 23 deposited on each power feeding section 22 and the aforementioned insulating strips g1+g2, g3, etc. are selected so that they abut each other.

In addition, the power supply section 22 of these electrodes X11X21X3... is made of silver Ag having good electrical conductivity, for example, and as the discharge section 21, unlike the power supply section 22, the electrical conductivity does not need to be as high as on the left, but it is particularly stable. That is, it is made of a conductive material, such as chromium Cr, which is not attacked by mercury and Hg.

In the illustrated example, the discharge section 21 and the electrodes y1, y2, y3...
Since these discharge parts 21 are arranged so that they do not coincide with each other, it is not necessary to make them light-transmissive. However, if they are arranged in positions where they coincide with each other, these discharge parts 21 may be formed of a transparent conductive layer. It is desirable to do so.

In this way, even in the display tube described with reference to FIGS. 3 to 6, the insulating material 23 deposited on the power supply part 22 of each electrode X1+X2+X3... and the insulating strips g1+g2pg3... collide with each other. Even when the protrusions forming the substrates 2 and 3 are brought into contact with each other to form a flat display tube, the distance between the substrates is similar to that described above. When exhausting the air from the space, as both substrates 2 and 3 are attracted by the negative pressure, the protrusions attached to their inner surfaces that should abut each other slide down to a predetermined positional relationship. The disadvantage is that it is difficult to hold.

In the present invention, in the above-mentioned various flat display tubes, it is possible to provide grooves or the like to allow the frit to flow into the tube without causing misalignment between the two substrates constituting the flat tube. Therefore, it is an object of the present invention to provide a flat display tube which can be prevented from occurring.

With reference to FIGS. 7 and 8, the present invention will be explained in detail in FIGS. 1 and 2.
An example of application to the fluorescent discharge display tube described with reference to the figures will be explained in detail.

In FIGS. 7 and 8, parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals and redundant explanations are omitted, but in particular in the present invention, the substrates 2 and 3 are combined. Before sealing, a wide protrusion having a flat top surface is formed on the inner surface of one or both of the substrates 2 and 3.

These protrusions are formed on the inner surfaces of the substrates 2 and 3 to abut each other, that is, in this example, the insulating strips gtlg29g.
3... and barrier electrodes s, ts2, s3..., each having a width sufficiently larger than that of the barrier electrodes s, ts2, s3..., for example, a width of about 3 mm, which is more than twice the width, and which should abut each other, that is, insulating projections. The height is selected to be slightly smaller than the sum of the heights of the striations and barrier electrodes.

In the illustrated example, protrusions 30 and 31 whose top surfaces are flat are formed on both inner surfaces of both substrates 2 and 3. In this case, both protrusions 30 and 31 support insulating substrates 2 and 3. In the state where they are placed opposite each other at a predetermined position, their flat top surfaces 3
Make sure that 0a and 31a match.

The protrusions 30 and 31 are the protrusions of the substrates 2 and 3 that should abut against each other, that is, the insulating strips g1+g2+g3...
and the barrier electrodes s1, S2, S3, .

Then, the substrates 2 and 3 are sealed together by a frit 4 on the outside of these protrusions.

In this case, the gas in the space 5 between the substrates 2 and 3 is exhausted, but as the gas is exhausted, a negative pressure is created in the space 5, which causes the substrates 2 and 3 to be attracted to each other. Since the double-end pedestals 30 and 31 have mutually flat top surfaces 30a and 31a, they will not slide down from each other and cause a problem.

Then, by creating negative pressure in the space 5, both substrates 2
and 3 bend inwardly, so that the protrusions facing each other, i.e.,
Insulating strips g1pg2, g3... and barrier electrode S
It effectively collides with 1+S2+S3...

As described above, according to the present invention, before the two substrates 2 and 3 are combined, the protrusions 30 and 31 having relatively wide and flat top surfaces are arranged on the outer side of the inner surfaces of the two substrates. west,
A ridge g that matches the sum of the heights of the ridges 30 and 31
lyg2+g3... and barrier electrode S1+S2+
Since it was chosen as a dog based on the sum of the heights of S3..., when the two boards 2 and 3 are combined, the flat surfaces of the two abutment stands 30 and 31 are brought into contact with each other. As in the case where the protrusions having curved surfaces, that is, the insulating strips g1+g21g3... and the barrier electrodes S1+S2+S3... directly abut each other, the curved parts slide against each other, causing positional deviation. There's no fear at all.

Further, the frit 4 can be prevented from flowing into the space 5 on the outside of the protrusions 30, 31, and there is a concave groove for blocking the flow as explained with reference to FIG. There is no fear that the mechanical strength of the substrate 3 will be impaired, unlike when the substrate 14 is provided.

In the example described above, the insulating strips g are provided on the inner surfaces of the substrates 2 and 3.
tIg2jg3...and barrier electrodes s1, S2
This is a case in which the present invention is applied to a fluorescent display tube having a protrusion consisting of +S3..., but it can also be applied to a display tube having other protrusions, such as a discharge display tube as explained with reference to FIGS. 3 to 6. It will be obvious that the present invention can be applied to, etc. to achieve similar effects.

Further, in the above-mentioned example, the protruding base 3 has flat surfaces 30a and 31a that abut each other on both inner surfaces of both substrates 2 and 3, respectively.
In some cases, it is also possible to form a protrusion on one of the substrates 2 or 3 having a flat surface that abuts the inner surface of the other substrate 3 or 2.

Further, in the above-mentioned example, the protrusions 30 and 31 are formed in an annular shape, but the protrusions 30 and 31 have protrusions, that is, insulating strips g1+g2yg3..., barrier electrode S
It is also possible to arrange them only on both the left and right sides of the substrates 2 and 3 in FIGS. 7 and 8 along the extension direction of 1+S2+S3...

[Brief explanation of the drawing]

1 and 2 are front views and cross-sectional views of essential parts of an example of a conventional display tube, and FIGS. 3 to 6 are other examples of conventional display tubes, and FIG. 4 is a front view of the display tube, FIG. 4 is a sectional view of the main part thereof, FIGS. 5 and 6 are a top view and a sectional view of the main part, respectively, and FIGS. They are a front view and a sectional view of important parts. 1 is a flat tube, 2 and 3 are substrates, 4 is a frit, 5 is a space, Y11y21y3... is a parallel cathode electrode, X1
, X2, X3... are parallel anode electrodes, g1+g2
+g3... is an insulating strip, s1, s2, s3...
is a barrier electrode, and PR, PG, and PB are fluorescent materials.

Claims (1)

[Claims] 1. Each of the pair of substrates is provided with a protrusion having a narrow width and a rounded top on each inner surface, and the protrusions provided on the inner surface of each of the pair of substrates abut each other. In flat display tubes that are sealed facing each other in a state in which A protruding base having a higher height and a flat top surface is provided, and the gas in the space formed between the substrates is exhausted so that the protrusions that should collide with each other collide with each other. A flat display tube characterized in that it is formed by matching.