JP3067657B2 - Method of manufacturing gas discharge display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a gas discharge display panel which excites a phosphor with ultraviolet rays generated by the generation of electric discharge in a discharge cell, thereby realizing a desired display color. It is characterized by the method of attaching the body.

[0002]

2. Description of the Related Art As shown in FIG. 12, a conventional gas discharge display panel 60 includes a rear substrate 12 made of an insulating material such as a flat glass and a front substrate 14 also made of a transparent insulating material such as a flat glass. Are disposed opposite each other with a predetermined gap therebetween, and the peripheral edges of both substrates are hermetically sealed with a sealing material (not shown) such as low-melting glass to form an envelope 16, and ultraviolet radiation is emitted to the internal space of the envelope 16. The basic configuration is to fill a discharge gas mainly composed of gas.

[0003] Ag · Pd
A plurality of strip-shaped cathode extraction patterns 18 made of a system paste or the like are arranged side by side at predetermined intervals. On the upper surface of each cathode extraction pattern 18, a plurality of columnar cathodes 62 made of an emitter material in which GdB ₆ and BaAl ₂ O ₄ are mixed at a ratio of about 2: 1 are erected at regular intervals. . The columnar cathode 62 has a cylindrical base end portion 62a buried in a cathode holding layer 64 covering the opposing surface of the back substrate 12, and
The substantially hemispherical tip portion 62b projects outside the cathode holding layer 64. The cathode holding layer 64 is made of an insulating material such as glass.

On the surface of the cathode holding layer 64, barrier ribs are provided.
66 are formed. The barrier rib 66 is made of an insulating material such as glass, and has a plurality of holes 66a surrounding each of the columnar cathodes 62. The hole 66a has a so-called funnel shape in which the hole diameter is gradually increased from below (the side of the cathode holding layer 64) to above (the side of the front substrate 14). At the approximate center of the tip of the columnar cathode 62
b is accommodated. The barrier rib 66 includes a first layer 68 in close contact with the surface of the cathode holding layer 64 and a second layer
It has a three-layer structure consisting of a third layer 72 and a third layer 72, and through-holes having different hole diameters are formed in each layer. Then, the through hole 68a of the first layer having the smallest hole diameter, the through hole 70a of the second layer having the next smallest hole diameter, and the through hole 72a of the third layer having the largest hole diameter are concentrically continuous. The hole portion 66a of the barrier rib is formed, and the hole diameter of the barrier rib is gradually increased from below to above. On the inner surface of the hole 66a of the barrier rib and on the surface of the cathode holding layer 64 (around the base of the columnar cathode 62), a phosphor 24 corresponding to a desired emission color is applied with a predetermined thickness.

A plurality of strip-shaped transparent anodes 28 made of a NESA film (SnO ₂ ), an ITO film (In ₂ O ₃ .SnO ₂ ) or the like are arranged on the opposite surface of the front substrate 14 at predetermined intervals. Has been established. The tip 62b of each of the above-mentioned columnar cathodes faces the transparent anode 28 with a predetermined gap therebetween, and a hole of a barrier rib is provided for each facing portion of the columnar cathode 62 and the transparent anode 28.
A discharge cell 74 defined by 66a is formed.
A plurality of spacers 26 made of an insulating material such as glass are arranged on the upper surface of the barrier rib 66. Since the end face of each spacer 26 is in contact with the facing surface of the front substrate 14, a gap 32 corresponding to the height of the spacer 26 is formed between the front substrate 14 and the barrier rib 66.

However, a transparent anode 28 is supplied from a power source (not shown).
When a DC voltage is applied between the columnar cathode 62 and the
A discharge is generated in the inside, and ultraviolet rays are generated. The ultraviolet light excites the phosphor 24 in the discharge cell 74, and light having a predetermined emission color is emitted to the outside through the transparent anode 28 and the front substrate 14. By selectively executing this voltage application via a control / drive circuit (not shown), discharge light emission is generated in a desired discharge cell 74, and an arbitrary character or figure can be displayed on the front substrate 14. .

At this time, not only the apex but also the side peripheral surface of the tip portion 62b of the columnar cathode participates in the discharge. Therefore, the ultraviolet light generated by the discharge is uniformly irradiated not only on the inner surface of the barrier rib but also on the phosphor 24 attached to the surface of the cathode holding layer 64, and when a flat non-projecting cathode is used. The display with higher luminance can be performed as compared with. In addition, the hole of the barrier rib 66 that partitions each discharge cell 74 is formed.
66a has a shape in which the hole diameter gradually increases from below to above, and the light generated by the discharge
Since the light is reflected by the inner surface of the substrate and condensed on the front substrate 14 side, an extremely high-luminance display is possible. Further, since the tip portion 62b of the columnar cathode is curved in a hemispherical shape, there is an advantage that the electric field intensity on the surface is uniform and the discharge characteristics are stabilized.

[0008]

As described above, the fluorescent substance is generated by the ultraviolet rays generated by the discharge in the discharge cell 74.
In the gas discharge display panel 60 of the type in which the required display colors are obtained by exciting the 24, the phosphor 24 is applied over as wide a range as possible within the discharge cell 74, in order to increase the display brightness. Is an indispensable condition. In particular, the columnar cathode as described above
In the case of employing the cathode 62, unless the phosphor 24 is sufficiently adhered to the lowermost layer portion of the barrier rib 66 or the root portion of the columnar cathode 62, the advantage of employing the protruding cathode is diminished. On the other hand, if the inside of the discharge cell 74 is filled with the phosphor 24 so that the surface of the tip end portion 62b of the columnar cathode is hidden, the generation of discharge will be hindered. Therefore, the phosphor 24
Are discharge cells 74 excluding the surface of the tip portion 62b of the columnar cathode.
It is important that the inner surface be adhered to the inner surface as wide and as appropriate as possible.

As a method of attaching the phosphor 24 to the inside of the discharge cell 74, a thick film printing method and a photo method are conventionally known. The thick film printing method is to cover a surface of the rear substrate 12 on which the barrier rib 66 is formed with a mask having an opening corresponding to a hole 66a of the barrier rib, and knead the binder with a binder over the mask. Is applied many times via a squeegee or a roller to fill the phosphor 24 into the hole 66a of the barrier rib (not shown). The photo method is a method in which a photosensitive resin and a phosphor 24 are formed into a paste through a binder, and the paste is applied to the entire upper surface of the barrier rib 66. Then, only the portion corresponding to the hole 66a of the barrier rib is transparent. While taking on the light, the other part is covered with a mask film on which a light-shielding pattern is printed, and ultraviolet light is applied from above to cure only the phosphor 24 applied in the hole 66a of the barrier rib, Next, a method of dissolving and removing the uncured phosphor 24 by immersing it in a special developing solution and consequently disposing the phosphor 24 only in the hole 66a of the barrier rib (not shown).

However, the above-mentioned conventional methods are basically based on the fact that the paste-like phosphor 24 having a certain degree of viscosity can be applied from the upper surface of the barrier rib 66 into the hole 66a. It was extremely difficult to apply the phosphor 24 with a constant thickness to the inner surface at the back of the provided hole 66a. That is, the phosphor 24 is easily attached to the vicinity of the upper layer of the hole 66a, but is difficult to reach the lowermost layer. For this reason, conventionally, as shown in FIG. 13, the phosphor 24 was once filled in the hole 66a of the barrier rib considerably more than the required amount, and then fired to remove unnecessary binder components. Later, a method was used in which an unnecessary abrasive 24 was scraped off by spraying an abrasive. In this case, if the phosphor 24 clogged between the side peripheral surface of the columnar cathode tip portion 62b and the inner surface of the barrier rib 66 is not reliably removed, the side peripheral surface will be buried in the phosphor 24. Since the effectiveness as a protruding cathode cannot be secured, it is necessary to control the operation of removing the surplus phosphor 24 with high accuracy. However, it is not an easy task to scrape the phosphor 24 that is deeply deposited as shown in the drawing until the phosphor 24 has an appropriate thickness over the entire inner surface of the barrier rib 66, and uncut or excessively cut off occurs. It was likely. In particular, when the inner surface of the barrier rib 66 has a funnel shape narrowing from top to bottom as described above, and the cathode also has a protruding columnar shape, a complicated shape appears by both. Requires more precise work, and if you make any mistakes, the tip of the columnar cathode 62
There was a risk of damaging b.

Further, in the conventional deposition method, since the paste-like phosphor 24 is only applied and baked, the adhesion strength of the phosphor 24 to the surface to be adhered is relatively weak, and the impact of sputtering or the like accompanying the generation of electric discharge. There is a disadvantage that it is easily peeled off.

The present invention has been made to solve the above-mentioned problem which has occurred in the conventional manufacturing method. Even if the shapes of the barrier ribs and the discharge electrodes are complicated, the fluorescent light can be spread over a wide area of the inner surface of the discharge cell. It is an object of the present invention to provide a method of manufacturing a gas discharge display panel which can relatively easily and firmly attach a body to a required thickness and has a low risk of damaging a discharge electrode by post-processing.

[0013]

In order to achieve the above object, a method of manufacturing a gas discharge display panel according to the present invention comprises:
On one surface, a front substrate made of a transparent insulating material formed with a plurality of transparent anodes, and on one surface, a plurality of cathode extraction patterns arranged side by side, and the cathode extraction pattern is erected on the surface of the cathode extraction pattern. A plurality of ridge-shaped cathodes extending along
A base portion in contact with the one surface, a plurality of first partitions partitioning each ridge-shaped cathode in the length direction at a predetermined interval, a plurality of second partitions partitioning each ridge-shaped cathode, and the first partition And a rear substrate made of an insulating material provided with a barrier rib having a large number of concave spaces surrounded by the second partition wall, and opposed to each other with a predetermined gap therebetween to form a discharge cell between both electrodes. The outer periphery of the substrate is hermetically sealed to form an envelope, and a phosphor and an ultraviolet radiation gas are sealed in the envelope. While projecting into the space, the base end of the ridge-shaped cathode is
It is embedded in the base of the barrier rib, and the tip of the ridge-shaped cathode forms a curved surface having a substantially semicircular cross section.The recessed space of the barrier rib extends from the rear substrate side to the front substrate side. A method of manufacturing a gas discharge display panel having a substantially funnel-shaped cross-section gradually spreading toward, wherein a step of applying and forming a plurality of cathode extraction patterns on one surface of a back substrate, Disposing the first base of the barrier rib at a predetermined thickness so as to avoid a place where the cathode extraction pattern is attached, thereby forming a groove on which the first base is not formed along the cathode extraction pattern. The process of
Arranging the base of the ridge-shaped cathode in the groove, arranging the second base of the barrier rib with a predetermined thickness on the surface of the first base of the barrier rib, A step of bringing a mask having a large number of through holes into close contact with the surface of the substrate, and spraying an abrasive from above the mask,
At a position corresponding to each of the through holes, the second of the barrier ribs
By digging a predetermined amount of the base and the first base,
At the same time that the tip of the base of the ridge-shaped cathode is projected by a necessary amount, the tip is shaped into a curved surface having a substantially semicircular cross section,
A step of forming the concave space having a substantially funnel-shaped cross section; removing the mask; and firing the first base, the second base, and the ridge-shaped cathode of the barrier rib to form the barrier rib and the ridge-shaped cathode. The step of completing and plasma-spraying the phosphor toward the recessed space of the barrier rib, and applying the phosphor with a predetermined thickness on the inner surface of the recessed space and the surface of the ridge-shaped cathode tip, and then the ridged cathode Removing the fluorescent material covering the surface of the tip portion and the upper surface of the barrier rib. As the phosphor, BaMgAl
₁₄ O ₂₃ : Eu ²⁺ or BaAl ₁₂ O ₁₉ : Mn, or (YE
u) It is desirable to use ₂ O ₃ .

In the plasma spraying, an inert gas such as argon or helium is turned into plasma by an arc, and the powder is sprayed into an ultra-high-temperature, high-speed jet formed by ejecting the gas from a fine nozzle. This is a technique for forming a film on the surface of the base material by accelerating it while melting it, and it is possible to form a film with high density and high strength. And
In order to blow off the sprayed material in countless fine particles,
By adjusting the pressure at the time of injection or by adjusting the injection time, there is an advantage that the thickness of the coating can be controlled relatively freely. Further, since only the phosphor can be applied, compared to the conventional method of applying a paste-like phosphor having a certain degree of viscosity due to the addition of the binder, a substrate having a complicated surface shape is required. It has the advantage that it can be applied evenly to the surface. Therefore, as described above, if the phosphor is plasma-sprayed toward the concave space of the barrier rib, the thickness of the barrier rib having a substantially funnel-shaped cross section and the surface of the tip of the ridge-shaped cathode are substantially as intended. The phosphor can be adhered. As a result, only a small amount of work is required to remove the phosphor that covers the surface of the ridge-shaped cathode, and the risk of accidentally damaging the tip of the ridge-shaped cathode is lower than with the conventional method of digging a discharge electrode buried deep in the phosphor. It can be completed easily and in a short time with little property. Moreover, the molten phosphor is allowed to reach the inner surface of the barrier rib with considerable force, and a part of the phosphor is fixed by being sunk into the inner surface of the barrier rib, so that compared to a case where the surface is simply covered. It has the feature of increasing the bonding strength.

Further, according to the above-described manufacturing method, the protrusion amount of the ridge-shaped cathode tip portion can be freely controlled by adjusting the depth of the barrier rib first base material. Furthermore, in the step of spraying the abrasive, the tip of the base of the ridge-shaped cathode is protruded by a necessary amount, the tip of the ridge-shaped cathode is shaped into a curved surface having a substantially semicircular cross section, and the cross section is substantially funnel-shaped. Is simultaneously realized.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas discharge display panel according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view showing a gas discharge display panel 10. The gas discharge display panel 10 has a rear substrate 12 made of an insulating material such as a flat glass and a front substrate 12 made of a transparent insulating material such as a flat glass. 14 are arranged facing each other with a predetermined gap therebetween, and the peripheral edges of both substrates are hermetically sealed with a sealing material (not shown) such as low-melting glass to form an envelope 16. The basic configuration is that a discharge gas in which He and Ar are mixed at a predetermined ratio is sealed in Xe gas for ultraviolet radiation.

On the opposite surface of the rear substrate 12, Ag.Pd
A plurality of strip-shaped cathode extraction patterns 18 made of a system paste or the like are arranged in parallel. On the upper surface of each cathode extraction pattern 18,
A ridge-shaped cathode 20 having a predetermined height is provided upright. The ridge-shaped cathode 20 is made of an emitter material in which GdB ₆ and BaAl ₂ O ₄ are mixed at a ratio of about 2: 1. Also, the ridge cathode 20
Has a substantially inverted U-shaped cross-section, and as shown in FIG.
Are formed so as to be long and continuous along the longitudinal direction.

A barrier rib 22 made of an insulating material such as glass is formed on the surface of the back substrate 12 (FIG. 1).
The barrier ribs 22 partition a base portion 22a in contact with the surface of the rear substrate 12, a plurality of first partition walls 22b separating the ridge-shaped cathodes 20 at predetermined intervals in the length direction, and partition between the ridge-shaped cathodes 20. It has a plurality of second partition walls 22c and a concave space 22d surrounded by the first partition walls 22b and the second partition walls 22c. As shown in the enlarged partial sectional view of FIG.
The base end portion 20a of the barrier rib 22 is embedded in the base portion 22a of the barrier rib 22, and the tip end portion 20b projects into the recess space 22d. The first ribs 22b and the second ribs 22c of the barrier ribs are not formed upright from the opposite surface of the rear substrate 12, but are formed so as to increase in thickness as approaching the rear substrate 12. As a result, the concave space 22
d has a substantially funnel-shaped cross section that gradually expands from the rear substrate 12 side to the front substrate 14 side, and the inner surface of the concave space 22d forms a reflection surface. On the inner surface of the concave space 22d, a phosphor 24 corresponding to a desired emission color is attached over substantially the entire area. As shown in FIG. 2, a spacer 26 made of glass or the like having a predetermined height is disposed at a portion where the first partition 22b and the second partition 22c intersect on the upper surface of the barrier rib 22. ing.

A band-shaped transparent anode 28 made of a NESA film (SnO ₂ ), an ITO film (In ₂ O ₃ .SnO ₂ ) or the like is formed on the facing surface of the front substrate 14. Although only one cross section of one transparent anode 28 is shown in FIG. 1, a plurality of transparent anodes 28 are actually arranged side by side at predetermined intervals. The plurality of transparent anodes 28 and each of the ridge-shaped cathodes described above
20 are positioned so as to intersect with a predetermined gap therebetween, and a discharge cell 30 surrounded by a barrier rib 22 is formed at each intersection. Since the end surface of the spacer 26 is in contact with the facing surface of the front substrate 14, a gap 32 corresponding to the height of the spacer 26 is formed between the front substrate 14 and the upper surface of the barrier rib 22. .

Thus, a transparent anode is supplied from a power source (not shown).
When a DC voltage is applied between 28 and the ridge-shaped cathode 20, the discharge cell
Electric discharge is generated within 30 and ultraviolet rays are generated. The ultraviolet light excites the phosphor 24 in the discharge cell 30, and light having a predetermined emission color is transmitted to the outside through the transparent anode 28 and the front substrate 14. By selectively executing this voltage application via a control / drive circuit (not shown), a desired discharge cell 30 is obtained.
, Discharge light emission is generated, and an arbitrary character or figure can be displayed on the front panel 14.

At this time, not only the top surface but also the side surface of the tip 20b of the ridge-shaped cathode 20 participates in the discharge.
As a result, a discharge is generated in a relatively wide range in the discharge cell 30, and the ultraviolet light generated by the discharge is sufficiently applied to substantially the entire phosphor 24 attached to the inner surface of the concave space 22d of the barrier rib. Therefore, extremely high-luminance display can be performed.

The concave space 22d of the barrier rib has a substantially funnel-shaped cross section which gradually expands from the lower side to the upper side as described above, and the inner surface thereof constitutes a reflecting surface. Is reflected by the inner surface and is condensed on the front substrate 14 side, so that a higher-luminance display is possible.

As shown in FIG. 3, the lower end 20a of the row-shaped cathode
Is buried in the base portion 22a of the barrier rib, and the base portion 22a
Is securely held by Therefore, compared to the case where the lower end face of the row-shaped cathode 20 is simply connected to the surface of the cathode extraction pattern 18, the connection strength to the cathode extraction pattern 18 is significantly higher, and it is difficult to remove easily. For this reason, sufficient connection strength can be ensured even if the ridge-shaped cathode 20 is formed thinner in accordance with the miniaturization of the discharge cells 30. Further, as described above, since the ridge-shaped cathode 20 is formed so as to extend long along the cathode extraction pattern 18, the strength of itself is increased as compared with the conventional columnar cathode.

Furthermore, since the tip portion 20b of the ridge-shaped cathode is formed in a substantially semicircular cross section, the electric field intensity on the cathode surface becomes substantially uniform, and the discharge characteristics can be stabilized. Of course, it is possible to perform the function as a cathode simply by using the ridge-shaped cathode tip portion 20b with a rectangular cross-section without shaping it into a substantially semicircular cross-section. However, if an edge portion is left at the tip of the cathode, electric field concentration occurs at the edge portion, so that the electric field intensity between the edge portion and the anode is higher than in other portions, and the discharge characteristics may be unstable. Therefore, it is desirable to form the surface of the ridge-shaped cathode tip portion 20b into a curved surface with a reduced edge to make the electric field intensity uniform. When a discharge is generated in the discharge cell 30, the flow of ions between the discharge cells 30 is ensured through the gap 32.

Next, a method of manufacturing the gas discharge display panel 10, particularly on the rear substrate 12, will be described. First, as shown in FIG. 4, an Ag / Pd-based paste is printed on one surface of a back substrate 12 to form a strip-shaped cathode extraction pattern 18 and to form an insulating material such as a glass paste or a ceramic paste. By thick film printing etc.
The first base material 40 of the barrier rib is arranged at a predetermined thickness. At this time, since the first base material 40 of the barrier rib is arranged so as to avoid the place where the cathode extraction pattern 18 is attached, the groove 42 where the first base material 40 of the barrier rib is not arranged along the cathode extraction pattern 18. The surface of the cathode extraction pattern 18 is exposed at the bottom of the groove 42. Next, GdB ₆ and BaAl ₂ O are formed on the surface of the first base material 40 of the barrier rib.
₄ is sprayed by plasma spraying (FIG. 5). As a result, the base material 46 of the ridge-shaped cathode is filled in the groove 42.

Thereafter, the emitter material 44 deposited on the surface of the first base material 40 of the barrier rib is polished and removed (FIG. 6). As a result, only the emitter material (the base material 46 of the ridge-shaped cathode) filled in the groove 42 is left.

Next, as shown in FIG. 7, a thick film of an insulating material such as glass is printed on the surface of the first base material 40 of the barrier rib, so that the second base material 48 of the barrier rib is formed with a predetermined thickness. Let it be placed. In addition, the second base material 48 of this barrier rib is used.
On one surface, a photoresist film 50 made of a photosensitive resin is applied on one surface. Next, a mask on which a lattice pattern is printed is brought into close contact with the surface of the photoresist film 50, and an exposure process using ultraviolet light is performed (not shown) to form a cured portion corresponding to the pattern.
This is immersed in a predetermined developing solution to remove the uncured portion, thereby forming a lattice-shaped mask 54 in which a large number of substantially square through holes 52 are arranged in a dot matrix as shown in FIG. Form.

Next, as shown in FIG.
Abrasive is sprayed from a nozzle 56 arranged above the
A so-called sandblasting process is performed. The second base 48 and the first base 40 of the barrier ribs are in a state where the glass paste is simply dried, and have not yet been cured by firing. Exposed portions (portions corresponding to the through holes 52 of the mask) which are not covered with the metal are dug down. On the other hand, the base material 46 of the ridge-shaped cathode is deposited through plasma spraying and has a higher hardness than the base material of the barrier ribs. The above-mentioned sandblasting may be carried out for each individual through-hole 52 using a nozzle having a fine diameter, but as shown in the drawing, a nozzle 56 having a relatively large diameter is used.
(For example, 20 to 30φ), it is more efficient to spray the abrasive simultaneously on the plurality of through holes 52. In this case, the nozzle 56 reciprocates many times above each through-hole 52, thereby forming the second barrier rib corresponding to each through-hole 52.
The base body 48 and the first base body 40 are gradually dug down.

The amount of digging of the first base material 40 of the barrier rib can be adjusted by adjusting the number of reciprocations of the nozzle 56, adjusting the moving speed of the nozzle 56 and the injection speed of the abrasive, or the particle size and material of the abrasive. Can be freely controlled by selecting, as a result, the protrusion amount of the base 46 of the ridge-shaped cathode can be flexibly set. For example, the first base 40 and the second base 48 of the barrier ribs are each
After stacking at a height of 0 μm, the first base 40 is dug down by about 60 μm from the surface to obtain the base of the ridge-shaped cathode.
The tip of 46 is projected at a height of about 60 μm. Of course, if necessary, the first substrate 40 can be dug deeper to increase the degree of protrusion of the ridge-shaped cathode substrate 46. In this case, the first body 40 is dug deeper,
Although the connection strength between the base end portion of the ridge-shaped cathode base material 46 and the cathode extraction pattern 18 is reduced, the first base material 40 is initially provided.
There is no problem if is deposited thicker.

In the above sandblasting process, if the nozzle 56 is moved at a constant speed, the abrasive is sprayed more near the center of the through-hole 52, and the mask 54 near the periphery.
Because the probability of being disturbed by the cathode increases,
The 46 perimeters will be dug deepest. As a result, at the same time as exposing the tip of the base 46 of the ridge-shaped cathode, a concave space 22d having a substantially funnel-shaped cross section can be naturally formed. In addition, through the above sandblasting process,
The tip portion of the base 46 of the ridge-shaped cathode is also slightly polished, and its corners are dropped to naturally form a curved surface having a substantially semicircular cross section.

Next, after the mask 54 is peeled off, the entire back substrate 12 is subjected to a heat treatment, so that the first base material of the barrier ribs is formed.
After sintering the base material 40, the second base material 48, and the base member 46 of the ridge-shaped cathode to complete the barrier rib 22 and the ridge-shaped cathode 20, respectively, the predetermined phosphor 24 Is adhered. When attaching the phosphor 24, first, as shown in FIG.
The phosphor 24 is plasma-sprayed from the nozzle 58 toward d. As a result, as shown in FIG. 11, the phosphor 24 is applied in the form of a film on the inner surface of the concave space 22d and the surface of the ridge-shaped cathode tip 20b. Finally, the phosphor 24 covering the surface of the tip portion 20b of the ridge-shaped cathode and the upper surface of the barrier rib 22 is removed by means such as sandblasting, so that the barrier rib 22 is removed.
The phosphor 24 can be applied to substantially the entire inner surface of the substrate.

In the plasma spraying, as described above, the thickness of the coating can be controlled relatively freely by adjusting the pressure at the time of spraying or adjusting the spraying time, and the object having a complicated surface shape can be controlled. It has the advantage that it can be evenly applied to the surface of an object. Therefore, the phosphor 24 can be applied to the inner surface of the barrier rib 22 having a substantially funnel-shaped cross section and the surface of the tip portion 20b of the ridge-shaped cathode with a thickness substantially as intended. As a result, only a small amount of work is required to remove the phosphor 24 covering the surface of the tip portion 20b, and there is little risk of damaging the tip portion 20b of the ridge-shaped cathode by that much. Can be.

The molten high-temperature phosphor particles collide with the inner surface of the barrier rib 22 with considerable force, and a part of the particles is fixed in the inner surface of the barrier rib 22. It has the feature that the adhesive strength is much higher than when it is applied to the surface. Furthermore, since the phosphor 24 itself can be thermally sprayed and there is no need to knead a binder to be a binder, a step of firing and removing the binder can be omitted.

When the plasma spraying method is used, it is necessary to use a phosphor 24 which does not change even in a reducing atmosphere, for example, BaMgAl ₁₄ O for emitting blue light.
₂₃ : Eu ²⁺ is used for emitting green light, and BaAl ₁₂ O ₁₉ : Mn is used.
And (YEu) ₂ O ₃ for red emission.

The present invention is not limited to the production of a gas discharge display panel having a complicated structure in which the tip of the discharge electrode protrudes or the inner surface of the barrier rib forms a reflective surface as described above. It goes without saying that the present invention can be applied to the manufacture of a gas discharge display panel having a simpler structure.

[0036]

In the method of manufacturing a gas discharge display panel according to the present invention, since the phosphor is applied to the inner surface of the barrier rib by plasma spraying, the phosphor is applied to the target surface having a complicated surface shape. It is possible to apply the required thickness. As a result, the work of removing the phosphor covering the surface of the ridge-shaped cathode in order to expose the surface of the ridge-shaped cathode is minimized, and there is almost no danger of accidentally damaging the ridge-shaped cathode. Further, since the adhesive strength to the inner surface of the barrier rib is increased, it contributes to the improvement of the life characteristics of the gas discharge display panel.

Further, according to the above manufacturing method, by adjusting the depth of the first base material of the barrier rib,
The protrusion amount of the ridge-shaped cathode tip can be freely controlled. Also, in the step of spraying the abrasive, the tip of the base of the ridge-shaped cathode is protruded by a necessary amount, the tip of the ridge-shaped cathode is shaped into a curved surface having a substantially semicircular cross section, and the cross-section is substantially funnel-shaped. Can be simultaneously realized.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a gas discharge display panel according to the present invention.

FIG. 2 is a partial perspective view showing the back substrate side of the gas discharge display panel.

FIG. 3 is a schematic enlarged sectional view showing the vicinity of a row-shaped cathode of the gas discharge display panel.

FIG. 4 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 5 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 6 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 7 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 8 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 9 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 10 is a schematic cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 11 is a schematic enlarged cross-sectional view showing a manufacturing process on the back substrate side of the gas discharge display panel.

FIG. 12 is a schematic sectional view showing a conventional gas discharge display panel.

FIG. 13 is a schematic enlarged sectional view showing the periphery of a columnar cathode of a conventional gas discharge display panel.

[Explanation of symbols]

 10 Gas discharge display panel 12 Rear substrate 14 Front substrate 16 Envelope 20 Row cathode 22 Barrier rib 24 Phosphor 28 Transparent anode 30 Discharge cell

──────────────────────────────────────────────────続 き Continued on the front page (58) Surveyed fields (Int.Cl. ⁷ , DB name) H01J 9/227 H01J 9/02 H01J 17/06 H01J 17/16

Claims (4)

(57) [Claims] 1. A front substrate made of a transparent insulating material having a plurality of transparent anodes formed on one surface, and a plurality of juxtaposed and arranged in parallel on one surface.
Several cathode extraction patterns and the surface of the cathode extraction pattern
And a plurality of tubes standing along the cathode extraction pattern
Ridge-shaped cathode, base part in contact with the above-mentioned one surface, each ridge-shaped cathode
Are divided into a plurality of first spaces at predetermined intervals in the longitudinal direction.
A wall, a plurality of second bulkheads partitioning between the ridge-shaped cathodes, and
A number of recesses surrounded by a first partition and a second partition
A rear substrate made of an insulating material having a barrier rib having a partial space is disposed opposite to a predetermined gap to form a discharge cell between both electrodes, and the outer edges of both substrates are hermetically sealed to surround the substrate. together constituting the vessel, Ri Na encapsulated phosphor and ultraviolet radiation gas into the outer envelope, also, one tip of the ridge-shaped cathode
Part protrudes into the recessed space, and
The base end of the pole is embedded in the base of the barrier rib.
In addition, the tip of the ridge-shaped cathode is a semi-circular bay.
A curved surface, and a concave space of the barrier rib.
Is gradually expanding from the rear substrate side to the front substrate side.
A method for manufacturing a gas discharge display panel having a substantially funnel shape , comprising a plurality of cathode extraction patterns on one surface of a back substrate.
And forming an upper surface on one surface of the back substrate.
Avoid the area where the cathode extraction pattern is attached
1 is placed at a predetermined thickness, and the cathode
A groove along which the first base is not formed is formed along the turn.
Forming step, and placing the base of the ridge-shaped cathode in the groove.
And forming a barrier on the surface of the first substrate of the barrier rib.
Arranging the second base of the rear rib with a predetermined thickness
And a large number of through holes in the surface of the second substrate of the barrier rib.
Adhering a mask provided with
Spray the abrasive and move it up at the locations corresponding to the above through holes.
Excavating a predetermined amount of the second base and the first base of the barrier rib
By lowering, the tip of the base of the above ridge-shaped cathode is required
At the same time as the tip is approximately semicircular in cross section
Shaped into a curved surface, and furthermore, the above-mentioned concave portion with a substantially funnel-shaped cross section
Forming a gap, and removing the mask and removing the mask.
First body, second body and ridge-shaped cathode body of rear rib
Of firing ribs to complete barrier ribs and ridge-shaped cathodes
Then, the phosphor was plasma-sprayed toward the concave space of the barrier rib, and was applied with a predetermined thickness to the inner surface of the concave space and the surface of the tip of the ridge-shaped cathode . After, the ridge-shaped cathode tip
Surface and the step of removing the phosphor covering the upper surface of the barrier ribs, capital manufacturing method for a gas discharge display panel, which comprises a. 2. The method according to claim 1, wherein the phosphor is BaMgAl ₁₄ O ₂₃ : E.
The method according to claim 1, wherein the gas discharge display panel is u2 ⁺ . 3. The method according to claim 1, wherein the phosphor is BaAl ₁₂ O ₁₉ : Mn. 4. The method according to claim 1, wherein the phosphor is (YEu) ₂ O ₃ .