JP2000057951A - Image display device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the emission failure and radiation failure while preventing the adhesion of the volatile organic gas of the adhesive agent to a board at the time of heating for airtight sealing by arranging an airtight sealing adhesive agent in a peripheral edge support frame of a front plate and a back plate, and bonding both the plates after burning the adhesive agent. SOLUTION: A back plate 2 loaded with an electron emitting element group 4 and a front plate 1 loaded with an image forming member 5 are supported by a support frame 3 at a peripheral edge thereof. The support frame 3 is formed by cutting a blue plate glass board into a hollow shape, and the acrylic binder is added to the frit glass powder so as to adjust the frit glass powder at an appropriate viscosity, and in this condition, the frit glass powder is mixed with the organic solvent so as to form the paste-like frit glass mixture, and this airtight sealing adhesive material 6 is arranged in the support frame 3 at parts for abutting with the front plate 1 and the back plate 1. This adhesive agent is temporarily burned so as to burn the binder and the organic solvent of the adhesive material 6 for elimination, and thereafter, the front plate 1, the back plate 2 and the support frame 3 are positioned, and the predetermined heating is performed for adhesion, and thereafter, vacuum treatment is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat and thin image display device having an airtight structure and a method of manufacturing the same, and more particularly, to a front plate on which a fluorescent member and an electron accelerating electrode are formed and a front plate facing the front plate. Image display device in which a back plate having a plurality of electron-emitting devices arranged in a manner, and a support frame between the front plate and the back plate and supporting their peripheral edges are hermetically bonded to their opposing surfaces. And its manufacturing method.

[0002]

2. Description of the Related Art An image display apparatus of this type excites a phosphor to emit light, such as a fluorescent display tube for forming an image, a plasma display panel, or a display device using a field emission type or a surface conduction type electron emission element. It has the advantages of being flat, bright, and easy to see, and is actively applied in industry, and is expected to develop in the future. Note that two types of electron emitting devices, a thermionic electron source and a cold cathode electron source, are known.

[0003] Cold cathode electron sources include a field emission type (hereinafter abbreviated as FE), a metal / insulating layer / metal type (hereinafter abbreviated as MIM), and a surface conduction electron-emitting device (hereinafter abbreviated as SCE). As an example of the FE type, W. P. Dyke & W. W.
Dolan, "Fielddemion", Ad
vance in Electron Physic
s, 8, 89 (1956) and C.I. A. Spindt,
“Physical properties of
hin-film field emissionca
those with mollybdenum co
nes ", J. Appl. Phys., 47, 5248.
(1976).

As an example of the MIM type, C.I. A. Mead
“The tunnel-emission ampl
ifier ", J. Appl. Phys., 32, 64.
6 (1961).

[0005] The surface conduction electron-emitting device utilizes the phenomenon that electrons are emitted by passing a current through a thin film having a small area formed on a substrate in parallel with the thin film. Examples of the surface conduction electron-emitting device include a device using an SnO ₂ thin film by Elinson or the like, a device using an Au thin film {G. Dittmer: “Thin Sold Fil
ms ", 9,317, (1972) }, In 2 O 3 / S
nO ₂ thin film {M. Haltwell and
C. G. FIG. Fonstad: "IEEE Trans.
ED conf. , 519, (1975)}, using carbon thin film, {Hisashi Araki et al .: “Vacuum”, Vol. 26,
No. 1, p. 22 (1983)} and others have already been reported.

FIG. 3 is an exploded perspective view for explaining the structure of a conventional general image forming apparatus, and FIG. 4 is a sectional view of the image forming apparatus shown in FIG. As shown in FIGS. 3 and 4, the general image forming apparatus shown in FIG. 1 includes a back plate 102 on which a plurality of electron-emitting devices are mounted, A front plate 101 on which a plurality of image forming members such as a phosphor on which an image is formed by irradiation with an electron beam is mounted, and the front plate 101 and the back plate 1 are provided between the front plate 101 and the back plate 102.
And a supporting frame 103 for supporting the peripheral edge of the supporting frame 103.
To form an airtight structure.

At this time, the adhesive for hermetic sealing is, for example,
As described in Japanese Patent Application Laid-Open No. 7-302540, frit glass is used, and is disposed on the front plate and the back plate in a portion that comes into contact with the support frame. Since this frit glass is powder as a simple substance,
In the case of arranging, it is adjusted to an appropriate viscosity with a binder such as nitrocellulose or acrylic, and mixed with an organic solvent in this state to be used as a paste-like frit glass mixture. In this case, a heating step called pre-baking for burning and removing the binder and the organic solvent described above is required before the hermetic sealing heating step.

[0008] In addition, in the inventor who has already invented the present invention, the frit glass is arranged on the opposing surface on the support frame with respect to the front plate or the back plate.

[0009]

However, in the above conventional example, the hermetic sealing adhesive is disposed on one of the front plate and the back plate, so that the hermetic sealing adhesive is required during the heating step. When the organic gas volatilizes, organic substances adhere to the substrate.For example, in the case of the front plate, since the upper side is a member such as a phosphor on which an image is formed, light emission failure of the phosphor occurs. In the case of a back plate, there is a possibility that electron beam irradiation failure may occur because the back plate is on the electron-emitting device. In particular, when frit glass was used as the hermetic sealing adhesive, an organic solvent for forming a paste and a binder for adjusting the viscosity volatilized, and this defect became remarkable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a volatile organic gas emitted from an adhesive for hermetic sealing from adhering to a substrate, and to provide a fluorescent material. It is an object of the present invention to provide a controlled image display device in which light emission failure of a body and electron beam irradiation failure are substantially zero or extremely small, and a method of manufacturing the same.

[0011]

According to the present invention, there is provided a front plate on which a fluorescent member and an electron accelerating electrode are formed, and a plurality of electron-emitting devices arranged opposite to the front plate. A backing plate having a support frame that is located between the front plate and the back plate and supports the periphery thereof.
In the image display device air-tightly bonded to the opposing surfaces, the support frame is in a state in which an air-tight sealing adhesive is previously disposed on both surfaces on which the front plate and the rear plate abut, and baked. Thus, it is characterized by being joined to the entire surface plate and the back plate.

Further, in the present invention, a front plate on which a fluorescent member and an electron accelerating electrode are formed, and a back plate having a plurality of electron-emitting devices arranged opposite to the front plate are provided. A method for manufacturing an image display device, wherein the supporting frame is hermetically bonded to the opposing surfaces so as to be hermetically bonded through a supporting frame that supports the peripheral edge between the supporting frame and the back plate. An adhesive for hermetic sealing is applied to both surfaces in advance, volatile components are removed by baking, and both sides are joined to the opposing surfaces of the front and back plates to form an airtight space. And

As described above, the adhesive for airtight sealing is not directly disposed on the front plate and the back plate, but the adhesive is previously applied to the surface of the support frame where the front plate and the back plate abut. By arranging, the volatile organic gas emitted from the hermetic sealing adhesive can be prevented from adhering to the substrate,
The emission failure of the phosphor and the irradiation failure of the electron beam can be made substantially zero or extremely small.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be specifically described with reference to FIGS. FIG. 1 is a sectional view showing a configuration of an image display device according to a first embodiment of the present invention. In the present embodiment, the image display device is, as described above, a back plate 2 on which the electron-emitting device group 4 is mounted.
A front plate 1 on which an image forming member 5 on which an image is formed by irradiating an electron beam emitted from the emitting element is arranged, facing the back plate 2; A supporting frame 3 is provided between the front plate 1 and the supporting frame 3 to support the peripheral edge thereof.

Each component is described as follows. The front plate 1 is formed by cutting a blue sheet glass substrate and then coated with a phosphor as an image forming member. The rear plate 2 is formed by cutting a blue sheet glass. In addition, as an electron emitting element,
A plurality of surface conduction electron-emitting devices are prepared and used as an electron-emitting device group. Further, the support frame 3 was obtained by cutting a blue glass substrate into a hollow square shape as shown in FIG. Note that frit glass was used for the hermetic sealing adhesive 6.

Since this frit glass is a powder alone, it is mixed with an organic solvent in a state adjusted to an appropriate viscosity with an acrylic binder to form a paste-like frit glass mixture, and this is mixed with a support frame 3 using a dispenser.
Are supplied and arranged on the surface where the front plate and the rear plate abut. Thereafter, the support frame is subjected to heating called pre-baking for burning and removing the binder and the organic solvent, and the hermetic sealing adhesive 6 is previously arranged on both surfaces of the support frame with which the front plate and the back plate abut. . This support frame is brought to the next step.

That is, the support frame, the front plate, and the back plate are positioned with respect to each other, and a predetermined heat bonding is performed. At this time, a load is applied between the front plate and the back plate, as shown in FIG. like,
An airtight envelope was constructed. Finally, in order to evacuate the inside of the hermetic envelope created in the steps up to now, vacuum is applied from an exhaust pipe (not shown) provided on the front plate 1, the back plate 2, and the support frame 3. Then, the exhaust pipe was sealed to produce an image display device.

In the image forming apparatus thus prepared, an adhesive for hermetic sealing is previously arranged on a surface of the support frame where the front plate and the back plate abut. For this reason, it is possible to prevent the volatile organic gas coming out of the hermetic sealing adhesive from adhering to the substrate, and the emission failure of the phosphor and the irradiation failure of the electron beam are substantially zero or extremely small. became.

[0019]

As described above, according to the present invention,
A front plate on which a fluorescent member and an electron accelerating electrode are formed, a back plate having a plurality of electron-emitting devices disposed opposite to the front plate, and a peripheral edge provided between the front plate and the back plate; In an image display device having at least a supporting frame to be sealed and having an airtight structure, an airtight sealing adhesive is disposed in advance on a surface of the supporting frame where the front plate and the back plate abut. By this, it is possible to prevent the volatile organic gas emitted from the hermetic sealing adhesive from adhering to the substrate, and the emission failure of the phosphor and the irradiation failure of the electron beam are substantially zero or extremely small. , An image display device can be provided.

[Brief description of the drawings]

FIG. 1 is a view for explaining a first embodiment of the present invention;
It is sectional drawing of an image display apparatus.

FIG. 2 is a perspective view showing a part of the image display device shown in FIG.

FIG. 3 is an exploded perspective view for explaining a conventional image display device.

4 is a cross-sectional view of the image display device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Front plate 2, 102 Back plate 3, 103 Support frame 4 Electron emission element group 5 Image forming member 6 Adhesive for airtight sealing

Claims (3)

[Claims] 1. A front plate on which a fluorescent member and an electron accelerating electrode are formed, a back plate having a plurality of electron-emitting devices disposed opposite to the front plate, and a gap between the front plate and the back plate. Therefore, in an image display device in which a supporting frame that supports those peripheral edges is hermetically bonded to their opposing surfaces,
The support frame, on both sides of the front plate and the back plate abut, in advance, an airtight sealing adhesive is arranged,
An image display device characterized by being bonded to an entire surface plate and a back plate in a state where the baking process is performed. 2. A front plate on which a fluorescent member and an electron accelerating electrode are formed, and a back plate having a plurality of electron-emitting devices arranged opposite to the front plate, wherein the front plate and the back plate are In between, via a support frame that supports their periphery, in a method of manufacturing an image display device that hermetically adheres the support frame to their opposing surfaces so as to be hermetically bonded, An image display characterized by applying an adhesive for hermetic sealing, removing volatile components by baking treatment, and joining both sides of the adhesive to opposing surfaces of a front plate and a back plate to form an airtight space. Device manufacturing method. 3. The hermetic sealing adhesive is frit glass, which is mixed in a paste with an organic solvent, applied to both sides of the support frame, and subjected to a heat treatment as pre-baking to obtain volatile components. 3. The method for manufacturing an image processing apparatus according to claim 2, wherein: