JPH10208637A - Sealing structure of flat form image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture element forming structure to suppress a crosstalk between picture elements, as well as to provide a picture element forming structure to prevent the concentration of the thermal distortion and the like in the manufacture process of a flat form image display device to a specific part, and furthermore, to improve the contrast of the picture image by suppressing the reflection of an outer light from a partition wall part. SOLUTION: A picture element forming structure to prevent the concentration of a thermal distortion and the like in the manufacturing process to a specific part can be provided by bonding a front plate 1 to be the component element of a flat form image display device such as a PDP, and the upper ends of partition walls 7 formed to a rear plate 2. At the same time, the picture elements are to be partitioned, no influence of the plusma is given between the neighboring picture elements, and a crosstalk can be suppressed. Furthermore, a structure to contact closely the partition walls 7 between the picture elements optically is provided, and the reflectance of the external light at the display screen is made possible to suppress, together with the blackening of a sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device such as a plasma display panel (hereinafter simply referred to as "PDP") used for a color TV, a personal computer, a word processor, and the like. The structure of a flat image display device.

[0002]

2. Description of the Related Art Conventionally, sealing and bonding of a PDP has been described with reference to FIG.
The following are known. In the figure, a discharge electrode is formed on a front plate (1) of a glass substrate (display electrode:
4) is coated thereon with an insulating dielectric (9),
An addressing electrode (5) is formed on the back plate (2), and a partition (7) for forming a discharge space (cell) (6) is formed. These members are integrally formed with the joining member (8) to form a PDP. The discharge space (6) is filled with a Penning mixed gas of Ne + Xe (0.1%) at a gas pressure of about 300 Torr, and phosphors of three colors (red: R, green: G) coated and formed on the partition (7). , Blue: B) (not shown) are excited by ultraviolet light generated by plasma generated when a voltage is applied between the display electrodes, and emit light. After the panel is joined, the inside of the cell is evacuated and Ne + Xe (0.1
%) Of Penning mixed gas is provided, and a glass tube and a getter (not shown) for removing impurity gas are provided.

In FIG. 3, the connection material used for sealing adhesion bonding is close to the thermal expansion coefficient of glass used as the substrate material of the panel, has little outgassing in a high-temperature atmosphere, has electrical insulation properties, and has sealing properties against various gases. A so-called low melting point solder glass such as lead glass having a high melting point is used. These are made into a paste form by a binder containing a thermally decomposable resin, and are applied to a desired portion by a printing method or a dispenser to a predetermined thickness, and pre-dried at 150 ° C. for 20 minutes. After that, the front plate (1) and the rear plate (2) are aligned, then fixed with clips or the like, heated to a high temperature of 430 to 450 ° C., and thermally decomposed to remove the solvent / binder in the paste. Fusion bonding.

Thereafter, the atmosphere between the front and rear panels is exhausted from a glass exhaust pipe connected to an exhaust hole (3) provided in the back plate (2), and unnecessary gas adsorbed by the material in the pipe is also removed from the panel. After heating the whole to 350 ° C and degassing,
The panel was sealed by filling a decompressed gas, for example, a Penning mixed gas of Ne + Xe (0.1%).

[0005]

When the front and rear panels are joined only at the outer periphery in this manner, thermal distortion is applied to the glass substrate of the panel substrate material, and dimensional changes occur. (A gap is formed between the partition and the front panel, so that individual cells cannot be controlled.) In an extreme case, there is a problem that a crack occurs. From another viewpoint, there is a problem that the entire screen is whitened due to reflection at the interface of the glass.

The present invention has been made in view of the above problems, and has a simple joining method, can be applied to a large-screen flat-panel image display device, and does not concentrate distortion at a specific joining portion. It is another object of the present invention to provide a structure that can easily ensure independence between pixels.

It is a further object of the present invention to provide a structure capable of reducing the substantial reflectance of the phosphor screen by preventing total reflection at the glass interface.

[0008]

In the method of bonding a flat panel display according to the present invention, a front plate and a back plate are sealed for each cell by providing an adhesive layer on an upper end of a partition wall of each cell. With such a configuration, thermal distortion of the entire panel is dispersed without being concentrated on a specific portion, so that cracks and the like can be prevented. At the same time, since each pixel can be partitioned to form an independent cell, plasma does not affect adjacent pixels, and crosstalk can be suppressed.

Although the upper part of the partition wall has been conventionally black in order to improve the contrast, the upper part of the partition wall is not in contact with the partition wall and total reflection of the glass surface is effective. By making the surface black, the optical reflection surface can be made black.

[0010]

1 and 2 show an embodiment of the present invention, in which a plan view of a back plate, a partial plan view,
FIG. In these figures, as in the conventional example, (2) is a back plate on which an address electrode (5) is formed and a partition (7) forming a discharge space (6) is formed. Is formed.

(Example 1) On a back plate (2), a side wall (10) having the same height as a partition wall (width 0.10 mm, height 0.2 mm) forming a cell to be a light emitting surface and having a width of 1 mm Was provided on the outer peripheral portion as shown in FIG. 3, and a predetermined amount of a bonding material was applied around the peripheral portion. Solvent dispersion type bonding material such as ASF1304 (made by Asahi Glass)
In the case where is used, after coating, drying was performed at about 110 to 120 ° C. for 30 to 60 minutes, and after the solvent was sufficiently vaporized, it was aligned with the front plate. Coating of the joining material was carried out by a printing method or the like after the joining material was slurried with an appropriate amount of a binder such as nitrocellulose and a solvent such as isoamyl acetate to adjust the viscosity.

FIG. 2 shows that after the front plate (1) and the rear plate (2) are aligned, a load of about 5 kg is applied from above to 430-450 ° C.
It is a fragmentary sectional view showing the place where it melt-joined in 40 to 60 minutes. The bonding material (8) used in this embodiment is applied to the upper surface of the partition wall and also to the outer peripheral portion of the side wall (10). Also, the bonding area can be increased by spreading the bonding material (8) on the contact surface between the side wall (10) and the front plate (1). Then, after cooling to 150 ° C., the joining was completed by releasing the load. At this time, the front plate (1) and the back plate (2) may be fixed with a clip or the like in order to prevent a positional shift until welding is performed.

(Example 2) If black ASF1307B (manufactured by Asahi Glass) is used as the sealing adhesion bonding material, the bonding surface can be blackened, so that the non-light-emitting portion of the screen sinks black, so that the contrast with the light-emitting portion can be easily obtained. A sharp image can be obtained.

[0014]

As described above, since the PDP according to the present invention can be bonded independently for each light emitting unit, the thermal strain on the glass substrate material can be dispersed, so that the deformation of the glass substrate can be reduced and the extreme. In such a case, cracks can be prevented.

[0015] Further, by using a black fusion bonding member having a low visible light reflectance, the reflectance of the entire screen can be reduced, so that it is possible to obtain a tight image in which the non-light emitting portion is blackened from a white screen. became.

In the foregoing, an example has been described in which an adhesive member is formed on the outer peripheral portion of a side wall particularly with a PDP having a side wall on the outer peripheral portion. However, the present invention is not limited to this, but applies to all other flat panel image display devices formed by joining general flat plates. Also, only crystalline frit glass is taken as an example of an adhesive, but it is not limited to this, and it is obvious that amorphous frit glass or inorganic and organic adhesives may be selected.

[Brief description of the drawings]

FIG. 1 is a plan view of a back plate showing one embodiment of the present invention.

FIG. 2 is a sectional view showing one embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional example of a PDP.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front plate, 2 ... Back plate, 3 ... Exhaust hole, 4 ... Display electrode, 5 ... Address electrode, 6 ... Discharge space, 7 ... Partition wall, 8
... Junction, 9 ... dielectric, 10 ... side wall.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shigeaki Suzuki 4-6, Kanda Surugadai, Chiyoda-ku, Tokyo Stock Company Hitachi, Ltd. Home Appliances and Information Media Business Unit

Claims (4)

[Claims] 1. A plasma display panel or the like in which a front plate on which electrodes for selecting each display pixel are formed and a rear plate having a partition wall formed so as to partition each display pixel are joined. A sealing structure for a flat-panel image display device, wherein the periphery of the front plate and the back plate are sealed and bonded together, and the partition wall forming body and the front plate are also bonded and bonded together. 2. The sealing structure for a flat panel display according to claim 1, wherein the material to be bonded and joined is made of low melting point solder glass. 3. The sealing structure for a flat panel display according to claim 1, wherein the partition wall forming body and the front plate are optically tightly joined to each other. 4. The sealing structure for a flat panel display according to claim 1, wherein the material to be closely bonded is made of a material having a low reflectance with respect to visible light.