JPH04215230A - Gas discharge display panel and manufacture thereof - Google Patents

Abstract

PURPOSE:To seal a front plate and a back plate so as to prevent the deterioration of the organic material forming color filters. CONSTITUTION:Color filters for red, green and blue comprised in a color displaying gas discharge display panel are made of the organic material by thick film printing method. Stage differences between the color filters for red, green and blue is thereby eliminated, and dispersion of the filter characteristic of these color filters is eliminated. A sheet-type sealing material 34, which is made of epoxy-nylon adhesive or epoxy-nylon-phenol adhesive, is used to seal a front plate 30 and a back plate 32. Since the sealing material 34 is hardened at a temperature less than 200 deg.C, the organic material forming the color filter is not deteriorated.

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, particularly a gas discharge display panel for color display, and a method for manufacturing the same.

0002

2. Description of the Related Art Conventionally, gas discharge display panels for color display have been proposed in which color filters are provided for the purpose of improving display characteristics such as increasing contrast ratio. FIG. 4 schematically shows the main part of a gas discharge display panel including a color filter.

In the gas discharge display panel shown in FIG. 4, a front plate 12 and a rear plate 14 are sealed together via a sealing material (not shown), such as lead glass, and a color display element is placed between the front plate 12 and the rear plate 14. 10 is sealed together with a discharge gas 16, and a color filter 18 is provided on the optical path for extracting the light from the color display element 10 to the outside of the panel as display light. 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 the light from the corresponding color display elements 10. The phosphors 24, labeled R, G and B in the figure, generate red, green and blue light and the color filter 1
8 transmits red, green and blue light.

In forming the color filters, a red color filter 18 is formed by coloring the front plate 12 using ion exchange coloring technology, and green and blue color filters 18 made of inorganic materials are formed using thick film printing technology. do. Regarding these ion exchange coloring techniques and inorganic materials, see Reference 1, for example.
: The one disclosed in Japanese Unexamined Patent Publication No. 59-36280 is used.

Two types of materials, organic and inorganic, have been developed as thick film materials for forming color filters, but usually, after forming the color filters 18, the front plate 12 is heated to about 400 to 500°C. Because high-temperature heat treatment is performed,
If an organic material is used, the organic material will be burnt and altered by high-temperature heat treatment, making it impossible to form a color filter 18 having desired filter characteristics. Therefore, an inorganic material is used as the material for forming the filter. However, inorganic materials developed to date for forming the red color filter 18,
It is not possible to form a red filter 18 that can effectively cut out light other than red, and the red light transmission characteristics become extremely poor compared to the blue and green light transmission characteristics, resulting in a change in the chromaticity of the color display element 10. Causes variation. Therefore, in order to eliminate variations in characteristics, we developed a red color filter 1 that can effectively cut out light other than red using ion exchange coloring technology.
form 8.

A filter protective layer 28 is provided on the color filter 18, and a plurality of anodes are provided on this protective layer 28 in parallel. 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 cathodes 22 are arranged so as to be perpendicular to each other when viewed from above. 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. A discharge gas 16 is filled in a gas filled region between the sealed front plate 12 and back plate 14.

[0008]

However, in order to eliminate variations in chromaticity of color display elements, the red color filter is formed using ion exchange coloring technology as described above, and the green and blue color filters are formed using thick film printing technology. When formed, the red color filter has a thin thickness of about 1 μm or less, while the green and blue color filters have thick thicknesses of about 3 to 15 μm, resulting in a large step difference between these color filters. the result,
At this stepped portion, the distance between the cathode and anode increases, causing some variation in discharge characteristics. Further, when forming the anode and the phosphor, the anode may be broken or the phosphor may be printed sagging, resulting in a decrease in yield.

[0009] Therefore, the inventor of this application formed a red color filter by thick film printing technology using an organic material capable of obtaining good filter characteristics, and after forming the red color filter, the post-process performed on the front plate was performed using an organic material. An attempt was made to manufacture a gas discharge display panel at a low temperature, such as 200° C. or lower, that does not cause deterioration of the material. In this attempt, an epoxy adhesive was used as the sealing material in order to seal the front plate and the back plate at a temperature of 200° C. or lower.

However, since the epoxy adhesive is in a liquid state before being cured, it is difficult to apply it accurately to the desired location, and the work efficiency is low. Furthermore, since the epoxy adhesive before curing is liquid, fluid, and sticky, care must be taken when handling the epoxy adhesive so that it does not adhere to areas where it does not need to be applied.

[0011] In general, epoxy adhesives include:
A type that uses a mixture of two liquids, a main material and a hardening material, is used, but after mixing these two liquids, the epoxy adhesive must be applied within a relatively short period of time to complete the bonding. Effective adhesive force cannot be obtained and workability is poor.

[0012] Furthermore, the epoxy adhesive before curing usually contains a solvent to lower its viscosity, and this solvent remains in the epoxy adhesive after curing, albeit in a small amount. For this reason, in gas discharge display panels that use epoxy-based adhesives as sealants, the solvent remaining in the epoxy resin gradually gasifies while the panel is driving the display and diffuses into the discharge space of the panel. , As a result, the display quality of the panel deteriorates.

[0013]Although glass substrates are normally used for the front plate and the back plate, there is a difference in thermal expansion coefficient between the glass substrate and the epoxy adhesive after curing. Therefore, when the glass substrate and epoxy adhesive are subjected to thermal cycles associated with display drive of the panel, thermal stress due to the difference in thermal expansion coefficient is applied to these substrates and adhesive, causing cracks in the substrate or the epoxy adhesive after curing. This will cause damage to the panel. Therefore, I tried using an elastic epoxy adhesive (an epoxy adhesive containing silicone resin) instead of the regular epoxy adhesive. After curing, the elastic epoxy adhesive has elasticity,
Therefore, thermal stress can be absorbed and damage to the panel can be prevented. However, the low molecular weight components of the silicone resin contained in the elastic epoxy adhesive gradually gasify and diffuse into the discharge space while the panel is driving the display.
The display quality of the panel deteriorates. The purpose of this invention is to solve the above-mentioned conventional problems by adding epoxy to the sealing material.
An object of the present invention is to provide a gas discharge display panel using a nylon adhesive and a method for manufacturing the same.

[0014]

[Means for Solving the Problems] In order to achieve this object, the gas discharge display panel of the first invention has one substrate and the other substrate sealed via a sealing material, and a color display is displayed between these substrates. A gas discharge display panel in which an element is sealed together with a discharge gas is characterized in that the sealing material is an epoxy-nylon adhesive.

[0015] Also, in the method for manufacturing a gas discharge display panel of the second invention, in manufacturing the gas discharge display panel of the first invention, a sheet-like or The present invention is characterized in that a film-like sealing material is disposed, and the sealing material is hardened by heating while being pressed and sandwiched between one and the other substrates.

[0016]

[Operation] According to the first invention, the sealing material is an epoxy-nylon adhesive. The cured epoxy-nylon adhesive contains nylon resin and therefore has elasticity. Therefore, even if thermal stress due to thermal cycles associated with display driving of the panel is applied between the encapsulant and one and the other substrate, the encapsulant absorbs the thermal stress, so that the encapsulant and the substrate It can prevent damage due to thermal stress. Moreover, the components contained in the epoxy-nylon adhesive after curing do not gasify and diffuse into the discharge space of the panel during display driving of the panel.

According to the second invention, a sheet-like or film-like sealing material made of an epoxy-nylon adhesive is arranged between one and the other substrates, and this sealing material is placed between one and the other substrates. It is heated and cured while being pressed and sandwiched between two substrates.

[0018] Before curing, the epoxy-nylon adhesive is non-fluid and has weak adhesive strength, and does not harden easily without heating. Therefore, by forming the epoxy-nylon adhesive before curing into a sheet or film form and using this as a sealing material, it is possible to improve the workability of the work of sealing the substrates.

[0019]

[Embodiments] Hereinafter, embodiments of the first and second inventions will be described with reference to the drawings. Note that the drawings are merely shown schematically 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 overall structure of an embodiment of the gas discharge display panel of the first invention.

As shown in these figures, the gas discharge display panel of this embodiment has one substrate 30 and the other substrate 30.
2 are sealed via a sealing material 34, and these substrates 30, 32
The color display element is sealed together with the discharge gas between the two. The sealing material 34 is an epoxy-nylon adhesive (resin),
For example, it consists of an epoxy-nylon adhesive or an epoxy-nylon-phenolic adhesive.

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

To explain the structure of this embodiment in more detail with reference to FIG. 3, the color display element 36 of the gas discharge display panel of this embodiment includes an anode portion 38a and a cathode portion 40a facing each other, and a phosphor. It consists of 42. Anode part 3
When a gas discharge is generated between the cathode portion 8a and the cathode portion 40a, ultraviolet rays are generated based on this gas discharge. The phosphor 42 receives this ultraviolet light and emits light for display.

The color display elements 36 are arranged in a matrix, and three types of color display elements 36 are provided, each generating light of a different color, for example, red, green, and blue. A color filter 44 is provided at a position corresponding to each color display element 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 using a thick film printing technique using an organic material. Since the red, green, and blue color filters 44 are each made of an organic material, there is no variation in the filter characteristics of each color. Also, each color filter 44
Since it is made of a thick film, it is possible to eliminate the difference in level between the color filters of these respective colors.

A transparent filter protective layer 46 is provided on the color filter 44, and a plurality of striped anodes 38 are provided in parallel on this protective layer 46. Then, a conductive phosphor 42 is provided on the anode portion 38a 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 to be perpendicular to each other when viewed from above. These anode 38 and cathode 40
The intersection of these is the anode portion 38a and the cathode portion 40a, and the color display element 36 is constructed at the intersection of these.

A striped barrier rib 48 is provided between the substrates 30 and 32, and the barrier rib 48 is arranged between adjacent anodes 38. A discharge gas 50 is filled in a gas filled region between the sealed substrates 30 and 30 .

Next, an embodiment of the second invention will be explained by taking as an example the manufacture of the gas discharge display panel according to the embodiment of the first invention described above.

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

Thick film printing technology was used to form this cathode, and Ni thick film paste (manufactured by DuPon Co., Ltd. #9) was used for forming the cathode.
535) in a predetermined pattern, the thick film paste was dried at 150°C for 1 hour, and then dried at 580°C for 1 hour.
Firing is performed for 0 minutes to form a cathode 40 made of a thick Ni film.

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

Thick film printing technology is used to form this barrier rib, and glass thick film paste (DuPo
#9741 manufactured by n company) is printed in a predetermined pattern, and this thick film paste is dried at 150° C. for 1 hour. By repeating these printing and drying steps, the thick film paste is laminated to a predetermined height.
C. for 10 minutes to form barrier ribs 48 made of a thick glass film.

Further, one of the substrates 30 is a front plate, and as shown in FIG. Place and form the corresponding position.

Thick film printing technology is used to form this color filter, and a thick film paste for color filter formation (manufactured by Dai Nippon Printing Co., Ltd.) is printed in a predetermined pattern, and this paste is dried and fired to form an organic material. Red, green, and blue color filters 44 are formed, respectively.

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

In forming this protective layer, an acrylic resin for forming the filter protective layer is laminated to a thickness of about 10 μm over the entire area where the color filter 44 is to be formed, and then hardened. The color filter 44 and filter protection layer 46 are formed using known techniques conventionally used in the manufacture of color liquid crystal display panels.

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

In this anode formation, a thin film formation technique is used, and a transparent conductive film such as ITO (In
A dium tin oxide) film is laminated on the filter protective layer 46, and then the transparent conductive film is patterned into a predetermined shape by photolithography and etching techniques to form the anode 38 made of the transparent conductive film. In addition, I for anode formation
The sheet resistance of the TO film was approximately 10 to 20 Ω/□.

Next, the phosphors 42 for red light generation, green light generation, and blue light generation are attached to the anode 38 and the cathode 4, respectively.
0 on the anode portion 38a at the intersection.

In forming this phosphor, heat treatment is performed using thick film printing technology at a temperature that does not cause deterioration of the organic material forming the color filter 44. Although the method for performing such heat treatment is not limited to this, here, a paste containing a phosphor powder and a low-temperature evaporative vehicle is used as a thick film paste for forming the phosphor. Low-temperature evaporative vehicles evaporate at low temperatures that do not cause deterioration of the organic material, such as approximately 150°C to 250°C.

When forming the non-conductive phosphor 42, the thick film paste for forming the phosphor is a paste consisting of phosphor powder and a low-temperature evaporable vehicle, and the entire anode portion 38a at the intersection of the anode and cathode is covered. The phosphor 42 is formed so as to be partially exposed without being covered, so that the phosphor 42 does not interfere with the generation of gas discharge. In addition, when forming the conductive phosphor 42, the thick film paste for forming the phosphor is a paste consisting of the phosphor powder, the low-temperature evaporative vehicle, and the conductive powder, and the anode portion 38a at the intersection of the anode and the cathode is The phosphor 42 is formed so as to cover the entire anode portion 38a, or the phosphor 42 is formed so as to expose a part of the anode portion 38a.
form.

The viscosity of the low-temperature evaporative vehicle is 100-10
00 cps, and the evaporation temperature is preferably about 150°C to 250°C, or the boiling point is 300°C or less. Examples of such vehicles include a mixture of Newport PE-74 (manufactured by Sanyo Chemical Co., Ltd.) and dipropylene glycol, A mixture of glycerin and dipropylene glycol can be used.

[0044] Red, blue, and green phosphor powders are used, for example, #KX504A and #KX501 manufactured by Kasei Optonics Co., Ltd.
A and #P1G1 are used to prepare a non-conductive phosphor-forming paste consisting of these phosphor powders and a low-temperature evaporable vehicle, and after printing, this thick film paste is dried by heating at 200° C. for 1 hour. When the vehicle evaporates, the phosphor 4
2 has been completed, the organic material forming the color filter 44 will not change in quality due to the formation of the phosphor 42. When forming a conductive phosphor forming paste, 2 g of Newpol PE-7 is added to 10 g of phosphor powder.
3 to 5 with 4 and 3.5 g of dipropylene glycol
A paste for forming a phosphor may be formed by mixing conductive powder, for example, ITO powder.

Next, as shown in FIG.
A sheet-like or film-like sealing material 34 made of epoxy-nylon adhesive (resin) is placed between one substrate 30 and the other substrate 32, and this sealing material 34 is placed between one substrate 30 and the other substrate 32. The substrates 30 and 32 are cured by heating while being pressed and sandwiched between the substrates 32, and the substrates 30 and 32 are sealed together with the sealant 34 interposed therebetween.

In this sealing, the sealing material 34 is a sheet of epoxy-nylon resin, such as AF made by Sumitomo 3M.
-42, the center portion of the sheet-like sealing material 34 corresponding to the panel display area 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 so that the striped anode 38 and the striped cathode 40 are perpendicular to each other when viewed from above. After alignment, a sealing material 34 is sandwiched between these substrates 30 and 32. Next, by evacuating between the substrates 30 and 32, the sealing material 34 is removed from the substrates 30 and 32.
Press and hold between 0 and 32. In order to ensure sealing with the sealing material 34, the pressing force at this time is, for example, 3.5K.
Although approximately g/cm2 is required, sealing can be ensured by exhausting the space between the substrates 30 and 32 to approximately 3.0 x 10-6 Torr. Next, the substrates 30 and 32 are heated at a rate of 6°C/m.
Heat it to about 180℃ and heat it to about 180℃.
C. for 0.5 to 1 hour to harden 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 second invention, the red, green, and blue color filters 44 included in the gas discharge display panel for color display are each formed using an organic material by a thick film printing method. As a result, the difference in level between the red, green, and blue color filters can be eliminated, so that the anode 38 formed on the color filter 44 can be prevented from breaking, and the phosphor 42 can be prevented from sagging in printing. Furthermore, 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 each color. Note that 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 difference in level between the color filters of each color can be eliminated, and the variation in filter characteristics of the color filters can also be eliminated.

Moreover, in the embodiment of the second invention described above, after forming the color filter 44 made of an organic material, heat treatment is performed at a low temperature that does not cause deterioration of the organic material.
A gas discharge display panel can be manufactured with a color filter 44 having initial filter characteristics.

[0050] These inventions are not limited to the above-mentioned embodiments, and therefore the shapes, dimensions, and
The arrangement position, forming material, forming method, and other conditions can be changed as desired.

[0051]

As is clear from the above description, according to the gas discharge display panel of the first invention, the sealing material is an epoxy-nylon adhesive. The cured epoxy-nylon adhesive contains nylon resin and therefore has elasticity. Therefore, even if thermal stress due to thermal cycles is applied between the encapsulant and one and the other substrates as the panel is driven to display, the encapsulant absorbs the thermal stress. It can prevent damage due to thermal stress. Furthermore, the components contained in the epoxy-nylon adhesive after curing do not gasify and diffuse into the discharge space of the panel during display driving of the panel, so deterioration of the display characteristics of the panel can be prevented.

According to the second invention, a sheet-like or film-like sealing material made of an epoxy-nylon adhesive is arranged between one and the other substrates, and this sealing material is placed between one and the other substrates. It is heated and cured while being pressed and sandwiched between two substrates.

[0053] Before curing, the epoxy-nylon adhesive is non-fluid and has weak adhesive strength, and does not harden easily without heating. Therefore, the epoxy before curing
By forming the nylon adhesive into a sheet or film form and using this as a sealing material, the workability of sealing the substrates can be improved.

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

[Brief explanation of the drawing]

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

FIG. 2 is an exploded perspective view schematically showing the overall configuration of the embodiment of the first invention.

FIG. 3 is a cross-sectional view schematically showing the configuration of main parts of the embodiment of the first invention.

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

[Explanation of symbols]

30: One board, for example, the front board 32: The other board, for example, the back board 34: Sealing material 36: Color display element 38a: Anode part 40a: Cathode part 42: Phosphor 44: Color filter 50: Discharge gas

Claims (3)

[Claims] 1. A gas discharge display panel in which one and the other substrate are sealed via a sealing material, and a color display element is sealed between these substrates together with a discharge gas, wherein the sealing material is an epoxy resin. A gas discharge display panel characterized by using a nylon adhesive. 2. In manufacturing the gas discharge display panel according to claim 1, a sheet-like or film-like sealing material made of an epoxy-nylon adhesive is disposed between the one and the other substrates. A method for manufacturing a gas discharge display panel, characterized in that the sealing material is cured by heating while being pressed and sandwiched between the one and the other substrates. 3. The method of manufacturing a gas discharge display panel according to claim 2, wherein the sealing material is pressed and held by evacuating the space between the one and the other substrates.