JP2002366050A - Method for manufacturing image display device, manufacturing device and image display device manufactured by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-quality image display device. SOLUTION: After a sealing material is applied on a panel, the sealing material is treated with laser light so as to reduce a high temperature thermal process added to the phosphor. This decreases deterioration in the luminance by the process of manufacturing panels, and a panel with high luminance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and apparatus for manufacturing an image display device such as a plasma display panel (PDP) or FED.

[0002]

2. Description of the Related Art Plasma display panels (PDPs)
A gas discharge type image display device represented by a flat display panel (F
DP), and 50-inch class products have already been commercialized. In this PDP, two thin glass plates (front panel glass and back panel glass) are separated by ribs (ribs).
, A phosphor layer is formed between the partition walls, and a discharge gas is sealed between the two glass plates and hermetically sealed. A display electrode for generating ultraviolet rays by discharging in a discharge gas is formed on the surface of the front panel glass.

FIG. 5 shows a schematic configuration diagram of a general PDP. The upper panel substrate 1 includes a pair of display electrodes 2 arranged on the upper panel substrate 1 while maintaining a predetermined distance from each other, and a dielectric layer 3 and a protective layer 4 are formed thereon.

The lower panel substrate 5 has an address electrode 6, a dielectric layer 7, a partition 8 and a phosphor layer 9 formed on the lower panel substrate 5. In particular, the phosphor layer 9 is formed by a printing method, a coating method, or the like, and has a smooth shape along the partition walls 8 and the dielectric layer 7 as shown in FIG.

[0005] A sealing member 10 is formed around the upper panel substrate 1 and the lower panel substrate 5 and bonded together. The discharge gas is sealed in the internal discharge space, the ventilation tube 11 is sealed, and the envelope 12 is completed.

[0006] In each cell, ultraviolet light generated by the display electrode 2 is converted into visible light by the phosphor layer 9 and used for light emission display. In the PDP, such cells are arranged in a matrix by a plurality of pairs of display electrodes 2 and partition walls 8.

[0007]

However, in such an image display device, further improvement in panel characteristics (higher luminance, higher efficiency, lower discharge voltage, etc.) has been desired.

One of the factors that degrade the panel characteristics is a thermal process applied to the phosphor in the panel forming process. After the phosphor baking step, the phosphor is pre-baked with a frit, which is an adhesive material for sealing, a sealing step, an
A baking step and three thermal processes are added. These thermal processes are high-temperature processes of about 300 to 500 ° C., and each time this treatment is applied to the phosphor, the intensity of the blue phosphor in particular decreases. 8 in one thermal process
%, And the three processes resulted in a luminance deterioration of about 20%. This heat treatment process has been one factor that hinders the increase in luminance of the panel.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a high-luminance image display device, and to provide a manufacturing method and a manufacturing device thereof.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a pair of panel substrates are arranged to face each other via a partition formed on one of the panel substrates, and the outer peripheral edges are sealed. A method for manufacturing an image display device having an envelope sealed by a member, wherein after applying a sealing material to at least one panel substrate, laser annealing the sealing material is performed. I do.

Further, the method is characterized in that a sealing material is applied to at least one side of the panel substrate, dried, and then the sealing material is laser-annealed.

Further, after the sealing material is laser-annealed, the sealing material is placed opposite to the opposing substrate and sealed.

The laser annealing of the sealing material is performed in an atmosphere containing oxygen.

According to the present invention, the number of heat treatment processes applied to the phosphor in the panel forming process can be reduced, so that a high-luminance image display device with less phosphor degradation can be realized, and it is possible to realize an image display device which is about 8 times smaller than the conventional one. % Improvement in luminance was confirmed.

[0015]

FIG. 1 shows an embodiment of the present invention. The above sealing step will be described in more detail.

As shown in FIG. 2, a sealing material (at least low melting point glass, An appropriate amount of a paste (a mixture of a binder and a solvent) 14 is applied. As shown in FIG. 3, after the coating is applied to the entire periphery, the substrate is put into a drying oven at about 100 ° C. for 10 minutes to evaporate the solvent in the sealing material 14. Thereafter, as shown in FIG. 1, the sealing material 14 from which the solvent component has been removed is irradiated with an argon laser or an excimer laser using a laser irradiation system 15.
The sealing material 14 is annealed by the energy of the laser, and the binder component in the sealing material melts, evaporates, and burns, so that organic substances can be removed from the sealing material. Further, since only the sealing material 14 is heated, the phosphor layer 9 is not subjected to a high-temperature heat process during frit calcination, so that the phosphor does not deteriorate.

Next, as shown in FIG. 4, the upper panel substrate 1 opposed to the lower panel substrate 5 which has been subjected to laser annealing of the sealing material is opposed to each other, fixed with a clip or the like, and sealed. After that, an exhaust / baking step, a gas introducing step, and a sealing step are performed to complete the panel. Although omitted here, a ventilation tube is also created at the same time in the sealing step.

Conventionally, after the phosphor is baked, there are three thermal processes in the frit pre-firing process, the sealing process, and the exhaust / baking process.
Since the pre-baking process of the frit among the two high-temperature heat treatment processes is eliminated, a high-performance panel with little deterioration of the phosphor, high brightness, and high luminance can be produced.

Further, in this embodiment, by performing the treatment with the laser in an atmosphere containing oxygen, the combustion can be promoted and the treatment can be performed in a short time.

In this embodiment, the sealing material is applied, dried, and then treated with a laser. However, the drying step may be performed by laser treatment, and is not limited to this embodiment.

In addition, during the application of the sealing material, the treatment may be continuously performed with a laser, and the present invention is not limited to this embodiment.

[0022]

As described above, according to the present invention, since the heat treatment process applied to the phosphor layer can be reduced, it is possible to produce a panel having high brightness and improved display quality.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an apparatus for processing a sealing material with a laser according to an embodiment of the present invention.

FIG. 2 is a partial perspective view illustrating the application of a sealing material according to a conventional embodiment.

FIG. 3 is a perspective view illustrating a dry state after application of a sealing material according to a conventional embodiment.

FIG. 4 is a schematic diagram illustrating a sealing step according to a conventional embodiment.

FIG. 5 is a cutaway perspective view showing a simplified PDP according to a conventional embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper panel substrate 2 Display electrode 3 Dielectric layer 4 Protective layer 5 Lower panel substrate 6 Address electrode 7 Dielectric layer 8 Partition wall 9 Phosphor layer 10 Sealing member 11 Vent pipe 12 Envelope 13 Dispenser 14 Sealing material 15 Laser Irradiation system 16 Laser light

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Shiratori 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Katsuyoshi Yamashita 1006 Kadoma Kadoma, Kadoma City Osaka Pref. Term (reference) 5C012 AA09 BC03 BC04 5G435 AA03 AA14 BB06 EE33 FF00 HH14 KK05

Claims (6)

[Claims] An image provided with an envelope formed by arranging a pair of panel substrates so as to face each other via a partition wall formed on one of the panel substrates and sealing the outer peripheral edges to each other with a sealing member. A method for manufacturing a display device, comprising applying a sealing material to at least one side of a panel substrate, and then subjecting the sealing material to laser annealing. 2. The method according to claim 1, wherein the sealing material is applied to at least one side of the panel substrate, dried, and then laser-annealed to the sealing material. Method. 3. The method for manufacturing an image display device according to claim 1, wherein after the sealing material is laser-annealed, the sealing material is disposed so as to face the opposing substrate and sealed. 4. The method according to claim 1, wherein the laser annealing of the sealing material is performed in an atmosphere containing oxygen. 5. A manufacturing apparatus for an image display device, wherein the manufacturing method according to claim 1 is used. 6. The image display device according to claim 1, wherein the image display device is a plasma display panel.