JP2957282B2 - 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 gas discharge display panel, and more particularly to a method of manufacturing a gas discharge display panel for color display.

[0002]

2. Description of the Related Art Hitherto, a gas discharge display panel for performing color display has been proposed in which a color filter is provided for the purpose of improving display characteristics such as increasing a contrast ratio. FIG. 4 schematically shows a main configuration of a gas discharge display panel having a color filter.

In the gas discharge display panel shown in FIG. 4, a front panel 12 and a rear panel 14 are sealed with a sealing material (not shown) such as lead glass, and a color display element is provided between the front panel 12 and the rear panel 14. 10 has a structure in which a color filter 18 is provided on an optical path for enclosing the light 10 from the color display element 10 as display light outside the panel, together with the discharge gas 16. The color display element 10 includes an anode portion 20a and a cathode portion 22a facing each other, and a phosphor 24. The color display elements 10 generate red, green or blue light, and the color filters 18 transmit light from the corresponding color display elements 10. Phosphor 24 generates red, green, and blue light, and color filter 18 transmits red, green, and blue light, shown as R, G, and B in the figure.

In the formation of color filters, a red color filter 18 is formed by coloring the front plate 12 by an ion exchange coloring technique, and green and blue color filters 18 made of inorganic materials are formed by a thick film printing technique. I do. As for the ion exchange coloring technique and the inorganic material, for example, those disclosed in Reference 1: JP-A-59-36280 are used.

[0005] Two kinds of materials, organic and inorganic, have been developed as a thick film material for forming a color filter. Usually, after forming the color filter 18, a post-process performed on the front plate 12 at about 400 to 500 ° C. Because high temperature heat treatment is performed,
If an organic material is used, the organic material is burned by high-temperature heat treatment and deteriorates, and the color filter 18 having desired filter characteristics cannot be formed. Therefore, an inorganic material is used as a material for forming the filter. However, inorganic materials that have been developed to date to form the red color filter 18 include:
It is not possible to form a red filter 18 capable of practically sufficiently cutting light other than red light, and the red light transmission characteristic is extremely deteriorated as compared with the blue and green light transmission characteristics, and the chromaticity of the color display element 10 is reduced. Variations occur. Therefore, in order to eliminate the variation in characteristics, a red color filter 1 capable of practically sufficiently cutting light other than red by ion exchange coloring technology.
8 is formed.

A filter protection layer 28 is provided on the color filter 18, and a plurality of anodes are provided in parallel on the protection layer 28. Then, a conductive phosphor 24 is provided on the anode.

On the other hand, a plurality of cathodes 22 are provided in parallel on the back plate 14, and the anodes and the cathodes 22 are arranged so as to be orthogonal to each other in a plan view. A barrier rib 26 is provided between the front plate 12 and the back plate 14, and the barrier rib 26 is arranged between adjacent anodes. The discharge gas 16 is filled in a gas filling region between the sealed front plate 12 and back plate 14.

[0008]

However, in order to eliminate the variation in chromaticity of the color display element, the red color filter is formed by the ion exchange coloring technique and the green and blue color filters are formed by the thick film printing technique as described above. , The thickness of the red color filter is as thin as about 1 μm or less, while the thickness of the green and blue color filters is as thick as about 3 to 15 μm, causing a large step between these color filters. as a result,
At the step, the distance between the cathode and the anode is widened, causing some variation in discharge characteristics. Further, when the anode and the phosphor are formed, the anode is cut off, or the printing of the phosphor occurs, and the yield is reduced.

The inventor of the present application has proposed a method of forming a red color filter by a thick film printing technique using an organic material capable of obtaining good filter characteristics, and performing a post-process on the front panel after forming the red color filter. An attempt was made to manufacture a gas discharge display panel by performing the process at a low temperature, for example, 200 ° C. or less so as not to deteriorate the material. In this trial, an epoxy-based adhesive was used as a sealing material in order to seal the front plate and the back plate at a temperature of 200 ° C. or less.

[0010] However, since the epoxy adhesive before curing is in a liquid state, the operation of accurately applying the epoxy adhesive to a required portion is difficult and the working efficiency is poor. Since the epoxy adhesive before curing is liquid and fluid and has tackiness, care must be taken in handling the epoxy adhesive so that it does not adhere to places where it is not necessary to apply the epoxy adhesive.

[0011] As the epoxy-based adhesive, generally,
A type in which two liquids of a main material and a hardening material are mixed and used is used. However, after mixing these two liquids, an epoxy-based adhesive is applied within a relatively short time to complete the bonding. Effective workability is not obtained and workability is poor.

The epoxy adhesive before curing usually contains a solvent for lowering its viscosity, and this solvent remains in the epoxy adhesive after curing in a small amount. For this reason, in a gas discharge display panel using an epoxy adhesive as a sealing material, the solvent remaining in the epoxy resin gradually gasifies during display driving of the panel and diffuses into the discharge space of the panel. As a result, the display quality of the panel deteriorates.

A glass substrate is usually used for the front plate and the back plate, but there is a difference in the coefficient of thermal expansion between the glass substrate and the cured epoxy adhesive. Therefore, when a thermal cycle caused by the display drive of the panel is applied to the glass substrate and the epoxy-based adhesive, thermal stress caused by a difference in thermal expansion coefficient is applied to the substrate and the adhesive, and the substrate or the cured epoxy-based adhesive is cracked. Occurs and the panel is damaged. Therefore, instead of a normal epoxy adhesive, an elastic epoxy adhesive (an epoxy adhesive containing a silicone resin) was used. The elastic epoxy adhesive after curing has elasticity,
Therefore, damage to the panel can be prevented by absorbing thermal stress. However, the low molecular weight component of the silicone resin contained in the elastic epoxy adhesive gradually gasifies and diffuses into the discharge space during the display driving of the panel, and as a result, the display quality of the panel deteriorates. An object of the present invention is to provide a method for manufacturing a gas discharge display panel using an epoxy-nylon-based adhesive as a sealing material in order to solve the above-mentioned conventional problems.

[0014]

In order to achieve this object, a method for manufacturing a gas discharge display panel includes a method in which one and the other substrates are sealed with a sealing material, and a color display is provided between the substrates. In a method for manufacturing a gas discharge display panel in which an element is sealed together with a discharge gas, a sealing material is a sheet-like or film-like sealing material made of an epoxy-nylon-based adhesive, and this sealing material is used for one and the other. When curing by heating while pressing and holding between the substrates, the sealing material is pressed and held by evacuating the space between one and the other substrates.

[0015]

[0016]

According to the present invention, the sealing material is an epoxy-nylon adhesive. The epoxy-nylon-based adhesive after curing contains a nylon resin and thus has elasticity. Therefore, even if thermal stress caused by a thermal cycle accompanying display driving of the panel is applied between the sealing material and one of the other substrates, the sealing material absorbs the thermal stress. Damage due to thermal stress can be prevented. In addition, the components contained in the cured epoxy-nylon adhesive do not gasify during display driving of the panel and do not diffuse into the discharge space of the panel.

[0017]

The epoxy-nylon adhesive before curing is non-flowable, has low adhesive strength, and hardly cures without heating. Accordingly, the epoxy-nylon-based adhesive before curing is formed into a sheet or film, and by using this as a sealing material, the workability of the substrate sealing operation can be improved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. The drawings are only schematically shown to the extent that these inventions can be understood, and therefore these inventions are not limited to the illustrated examples.

FIGS. 1 and 2 are a partially cutaway plan view and an exploded perspective view schematically showing the entire structure of a gas discharge display panel according to an embodiment of the present invention.

As shown in these figures, the gas discharge display panel of this embodiment comprises one substrate 30 and the other substrate 3.
2 are sealed via a sealing material 34, and these substrates 30, 32
And a color display element enclosed with a discharge gas. The sealing material 34 is made of an epoxy-nylon-based adhesive (resin), for example, an epoxy-nylon adhesive or an epoxy-nylon-phenol adhesive.

FIG. 3 is an enlarged cross-sectional view showing a main part of the gas discharge display panel of this embodiment in more detail.

Referring to FIG. 3, the structure of this embodiment will be described in more detail. The color display element 36 of the gas discharge display panel of this embodiment comprises an anode portion 38a and a cathode portion 40a opposed to each other, and a phosphor. 42. Anode part 3
When a gas discharge is generated between 8a and the cathode portion 40a, ultraviolet rays based on the gas discharge are generated. Phosphor 42
Emits this ultraviolet light and emits light for display.

The color display elements 36 are arranged in a matrix, and three kinds of color display elements 36 for generating light of different colors, for example, red, green and blue are provided. Then, color filters 44 are provided at positions corresponding to the respective color display elements 36. In the figure, phosphors 42 labeled R, G and B emit red, green and blue light and color filters 44 transmit red, green and blue light.

In this embodiment, the red, green and blue color filters 44 are thick film filters formed by a thick film printing technique using an organic material. Since the red, green and blue color filters 44 are made of organic materials, there is no variation in the filter characteristics of each color. In addition, the color filter 44 of each color
Is formed of a thick film, the step between the color filters of these colors can be eliminated.

A transparent filter protective layer 46 is provided on the color filter 44, and a plurality of striped anodes 38 are provided on the protective layer 46 in parallel. Then, a conductive phosphor 42 is provided on the anode portion 38 a of the anode 38.

A plurality of striped cathodes 40 are provided in parallel on the other substrate 32, and the striped anodes 38 and the striped cathodes 40 are arranged so as to be orthogonal to each other when viewed in plan. These anode 38 and cathode 40
Are the anode portion 38a and the cathode portion 40a, and the color display element 36 is formed at the intersection.

A stripe-shaped barrier rib 48 is provided between the substrates 30 and 32, and the barrier rib 48 is arranged between the adjacent anodes 38. The discharge gas 50 is sealed in a gas sealing region between the sealed substrates 30 and 30.

Next, an embodiment of the present invention will be described by taking the above-described configuration as an example.

In this example, the other substrate 32 is a back plate. As shown in FIG. 3, a plurality of striped cathodes 40 are formed on the other substrate 32 in parallel.

For forming the cathode, a thick film printing technique is used, and a Ni thick film paste for forming the cathode (# 95 manufactured by DuPont) is used.
35) is printed in a predetermined pattern, and the thick film paste is dried at 150 ° C. for 1 hour, and then dried at 580 ° C. for 1 hour.
By baking for 0 minutes, a cathode 40 made of a Ni thick film is formed.

Next, a plurality of stripe-shaped barrier ribs 48 are formed on the cathode 40 in parallel.

A thick film printing technique is used for forming the barrier ribs, and a glass thick film paste (DuPo) for forming the barrier ribs is used.
# 9741) is printed in a predetermined pattern, and the thick film paste is dried at 150 ° C. for 1 hour. When the thick film paste is laminated to a predetermined height by repeating these printing and drying, the paste is heated to 530 ° C.
Baked for 10 minutes and barrier ribs 4 made of a thick glass film
8 is formed.

One of the substrates 30 is a front plate. As shown in FIG. 3, first, a red, green and blue color filter 44 is provided on one substrate 30 at the intersection of the anode 38 and the cathode 40, respectively. It is formed by arranging it at the corresponding position.

This color filter is formed using a thick film printing technique, a thick film paste for color filter formation (manufactured by Dai Nippon Printing Co., Ltd.) is printed in a predetermined pattern, and the paste is dried and fired to form an organic material. Are formed, respectively.

Next, a filter protection layer 46 is formed on the color filter 44.

In the formation of the protective layer, an acrylic resin for forming a filter protective layer is laminated on the entire surface of the area where the color filter 44 is formed in a thickness of about 10 μm and cured. The color filter 44 and the filter protection layer 46 are formed by using a known technique conventionally used in the manufacture of a color liquid crystal display panel.

Next, a plurality of striped anodes 38 are formed on the filter protection layer 46 in parallel.

In this anode formation, a thin film forming technique is used, and a transparent conductive film such as ITO (In) is formed by vapor deposition or sputtering.
(Din Tin Oxide) film to filter protection layer 4
Then, the transparent conductive film is patterned into a predetermined shape by photolithography and an etching technique to form an anode 38 made of the transparent conductive film. In addition, ITO for anode formation
The sheet resistance of the film was about 10 to 20 Ω / □.

Next, the phosphors 42 for generating red light, green light and blue light are respectively connected to the anode 38 and the cathode 4.
It is formed on the anode portion 38a at the intersection of 0.

In the formation of the phosphor, a heat treatment is performed by using a thick-film printing technique at a temperature that does not cause deterioration of the organic material forming the color filter 44. Although a method for performing such a heat treatment is not limited to this, here, a paste containing a phosphor powder and a low-temperature evaporable vehicle is used as a thick film paste for forming a phosphor. The low-temperature evaporable vehicle evaporates at a low temperature that does not cause deterioration of the organic material, for example, a temperature of approximately 150 ° C. to 250 ° C.

When the non-conductive phosphor 42 is formed, the phosphor-forming thick film paste is a paste composed of a phosphor powder and a low-temperature evaporable vehicle, and the entire anode portion 38a at the intersection between the anode and the cathode is used. The phosphor 42 is formed so as to expose a part thereof without being covered, so that the phosphor 42 does not prevent generation of gas discharge. When the conductive phosphor 42 is formed, the phosphor-forming thick film paste is a paste composed of a phosphor powder, a low-temperature evaporable vehicle, and a conductive powder. The phosphor 42 is formed so as to cover the whole,
Alternatively, the phosphor 4 may be exposed so that a part of the anode portion 38a is exposed.
Form 2

The viscosity of the low-temperature evaporable vehicle is 100 to 10
It is preferable that the vaporization temperature is about 150 ° C. to 250 ° C. or the boiling point is about 300 ° C. or less. Examples of such a vehicle include a mixture of Newpol PE-74 (manufactured by Sanyo Chemical) and dipropylene glycol, Mixtures of glycerin and dipropylene glycol can be used.

The red, blue, and green phosphor powders are mixed with, for example, # KX504A and # KX501 manufactured by Kasei Optonix.
A and # P1G1, a non-conductive phosphor-forming paste composed of the phosphor powder and the low-temperature evaporating vehicle is prepared, and after printing this thick film paste, it is dried by heating at 200 ° C. for 1 hour. Phosphor 4 when vehicle evaporates
Since the formation of 2 is completed, the organic material forming the color filter 44 is not deteriorated by the formation of the phosphor 42.
When forming a conductive phosphor-forming paste, 2 g of Newpol PE-7 is used for 10 g of the phosphor powder.
3-5 with 4 and 3.5 g of dipropylene glycol
g of conductive powder such as ITO powder may be mixed to form a phosphor-forming paste.

Next, as shown in FIG.
A sheet-like or film-like sealing material 34 made of an epoxy-nylon-based adhesive (resin) is arranged between the first substrate 30 and the other substrate 32. The substrates 30 and 32 are cured by heating while being pressed and held between the substrates 32, and the substrates 30 and 32 are sealed via a sealing material 34.

In this sealing, a sheet-like epoxy-nylon resin, for example, an AF-manufactured by Sumitomo 3M, is used as the sealing material 34.
The central portion corresponding to the panel display area of the sheet-shaped sealing material 34 is hollowed out to form a square shape.
Then, the sealing material 34 is placed on the other substrate 32, and the one substrate 30 and the other substrate 32 are arranged such that the stripe-shaped anode 38 and the stripe-shaped cathode 40 are orthogonal to each other in a plan view. The alignment is performed, and the sealing material 34 is sandwiched between the substrates 30 and 32. Then, the space between the substrates 30 and 32 is evacuated to thereby seal the sealing material 34 between the substrates 3 and 32.
Press and hold between 0 and 32. In order to ensure the sealing with the sealing material 34, the pressing force at this time is, for example, 3.5K.
g / cm @ 2 is required, but if the space between the substrates 30 and 32 is evacuated to about 3.0.times.10@-6 Torr, the sealing can be performed reliably. Next, the substrates 30 and 32 are heated at a rate of 6 ° C./mi.
Heat at about n, then 180 ° C after heating to about 180 ° C
Is held for 0.5 to 1 hour to cure the sealing material 34.

Next, a discharge gas is sealed between the substrates 30 and 32 to complete the gas discharge display panel of this embodiment.

In the above-described embodiment of the present invention, the red, green and blue color filters 44 provided in the gas discharge display panel for color display are each formed by a thick film printing method using an organic material. As a result, a step between the red, green, and blue color filters can be eliminated, so that disconnection of the anode 38 formed on the color filter 44 can be prevented, and dripping of the phosphor 42 can be prevented. In addition, by forming the red, green and blue color filters 44 from organic materials, it is possible to eliminate variations in filter characteristics among the color filters 44 of these colors. Even if the green and blue color filters 44 are formed from an inorganic material and the red color filter is formed from an organic material, the steps between the color filters of the respective colors can be eliminated, and variations in the filter characteristics of the color filters can be eliminated.

Further, in the above-described embodiment of the present invention, after the color filter 44 made of an organic material is formed, a heat treatment is performed at a low temperature so as not to cause deterioration of the organic material. 44 can be manufactured.

The present invention is not limited only to the above-described embodiments, and accordingly, the shapes, dimensions,
The arrangement position, the forming material, the forming method and other conditions can be arbitrarily and suitably changed.

[0051]

As is apparent from the above description, according to the gas discharge display panel manufactured according to the present invention, the sealing material is an epoxy-nylon adhesive. The epoxy-nylon-based adhesive after curing contains a nylon resin and thus has elasticity. Therefore, even if a thermal stress due to a thermal cycle is applied between the sealing material and one of the other substrates as the display of the panel is driven, the sealing material absorbs the thermal stress. Damage due to thermal stress can be prevented.
Moreover, the components contained in the cured epoxy-nylon adhesive do not gasify during the display driving of the panel and do not diffuse into the discharge space of the panel, so that the display characteristics of the panel can be prevented from deteriorating.

According to the present invention, a sheet-like or film-like sealing material made of an epoxy-nylon adhesive is disposed between one and the other substrates, and this sealing material is attached to the one and the other substrates. Heating and curing while pressing and holding between.

The epoxy-nylon-based adhesive before curing is non-flowable, has low adhesive strength, and hardly cures without heating. Therefore, the epoxy before curing
By making the nylon-based adhesive into a sheet shape or a film shape and using this as a sealing material, the workability of the sealing operation of the substrate can be improved.

The present invention is particularly effective when applied to sealing a substrate when a color filter is formed from an organic material. In this case, the curing temperature of the epoxy-nylon adhesive is set at a low temperature that does not cause deterioration of the organic material forming the color filter. Therefore, the substrate can be formed without deteriorating the filter characteristics of the color filter made of the organic material. Can be sealed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view schematically showing an entire configuration of an embodiment of the present invention.

FIG. 2 is an exploded perspective view schematically showing the entire configuration of the embodiment of the present invention.

FIG. 3 is a sectional view schematically showing a configuration of a main part of the embodiment of the present invention.

FIG. 4 is a cross-sectional view schematically showing a configuration of a main part of a conventional gas discharge display panel.

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Ichiro Koiwa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-63-250037 (JP, A) JP-A-63-250037 1974-17748 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 17/18 H01J 9/26 H01J 11/02

Claims (1)

(57) [Claims] 1. A method for manufacturing a gas discharge display panel comprising sealing one of a substrate and the other substrate via a sealing material, and sealing a color display element between the substrates together with a discharge gas. When a sheet-like or film-like sealing material made of an epoxy-nylon-based adhesive is used, and the sealing material is cured by heating while being pressed and held between the one and the other substrates, A method for manufacturing a gas discharge display panel, wherein the sealing material is pressed and clamped by evacuating the other substrate to vacuum.