JP4078910B2 - Method for manufacturing plasma display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a plasma display device known as a thin, lightweight display device having a large screen.
[0002]
[Prior art]
In recent years, plasma display devices have attracted attention as display panels (thin display devices) with excellent visibility, and higher definition and larger screens are being promoted.
[0003]
This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types: a surface discharge type and a counter discharge type, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, AC-type and surface-discharge-type plasma display devices are mainly used.
[0004]
FIG. 4 shows an example of a panel structure in the plasma display device, FIG. 5 shows a cross section taken along line AA in FIG. 4, and FIG. 6 shows a cross section taken along line BB in FIG. As shown in the figure, a plurality of pairs of stripe-like display electrodes 4 that are paired with a scanning electrode 2 and a sustaining electrode 3 are formed on a transparent front substrate 1 such as a glass substrate. A light shielding layer 5 is disposed between adjacent display electrodes 4. The scan electrode 2 and the sustain electrode 3 are respectively composed of transparent electrodes 2a and 3a and buses 2b and 3b made of silver or the like electrically connected to the transparent electrodes 2a and 3a. A dielectric layer 6 is formed on the substrate 1 on the front side so as to cover the plurality of pairs of electrodes, and a protective film 7 is formed on the dielectric layer 6, thereby forming a front panel. Has been.
[0005]
A plurality of stripes covered with an insulating layer 9 are arranged on the back substrate 8 facing the front substrate 1 in a direction perpendicular to the display electrodes 4 of the scan electrodes 2 and the sustain electrodes 3. A data electrode 10 is formed. On the insulator layer 9 between the data electrodes 10, a plurality of stripe-shaped partition walls 11 are arranged in parallel with the data electrode 10, and the phosphor layer 12 is formed on the side surface 11 a between the partition walls 11 and the surface of the insulator layer 9. Thus, a back panel is configured.
[0006]
The substrate 1 and the substrate 8 are arranged to face each other with a minute discharge space so that the scan electrode 2 and the sustain electrode 3 and the data electrode 10 are orthogonal to each other, and the periphery is sealed, and the discharge One or a mixed gas of helium, neon, argon, and xenon is sealed in the space as a discharge gas. In addition, the discharge space is divided into a plurality of sections by partition walls 11 to provide a plurality of discharge cells 13 at which the intersections of the display electrodes 4 and the data electrodes 10 are located. The phosphor layers 12 are sequentially arranged one by one so as to be blue.
[0007]
As shown in FIG. 7, the electrode arrangement of the panel body has a matrix configuration composed of M rows × N columns of discharge cells, and M rows of scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged in the row direction. N columns of data electrodes D1 to DN are arranged in the column direction.
[0008]
[Problems to be solved by the invention]
By the way, the dielectric layer in this type of plasma display device is applied with a dielectric paste made by kneading glass frit, binder resin, organic solvent, etc. on a substrate, dried, and then heated. By baking, the dielectric layer is formed by debinding and melting the glass frit. In firing the dielectric paste, it is desirable to burn the binder resin to completely remove the binder and reduce the generation of residual carbon and bubbles.
[0009]
However, conventionally, in the formation of the dielectric layer of the plasma display device, oxygen necessary for burning the binder resin is supplied only to the surface of the coating film, and the binder resin in the film is thermally decomposed in an oxygen-deficient state. Therefore, residual carbon tends to remain in the film, and most of the air contained in the film is nitrogen that does not contribute to combustion, and therefore remains in the film even after the debinding is completed, resulting in microbubbles. These residual carbon and fine bubbles have a problem of deteriorating the pressure resistance characteristics and transmittance of the panel.
[0010]
The present invention has been made in view of such problems, and it is an object of the present invention to improve the transmittance of a dielectric layer and obtain a panel having excellent withstand voltage characteristics.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention applies a dielectric paste having a binder resin and glass frit and bakes it to form a dielectric layer by first oxidizing the air present in the dielectric paste with oxygen. Then, the dielectric layer is formed by firing the dielectric paste while supplying oxygen .
[0012]
As a result, the air contained in the dielectric paste used to form the dielectric layer is replaced with oxygen, which promotes the combustion of the binder resin by the oxygen present in the coating film during firing, and occurs due to insufficient oxygen. Therefore, it is possible to reduce the number of microbubbles derived from nitrogen and to form a dielectric with few film defects. As a result, it becomes possible to manufacture a panel having excellent pressure resistance and transmittance.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
That is, according to the first aspect of the present invention, a pair of front-side and back-side substrates disposed opposite to each other so as to form a discharge space partitioned between the substrates by the partition walls, and the discharge partitioned by the partition walls. A plurality of electrodes disposed on the substrate so as to generate a discharge in space; a dielectric layer formed on the substrate so as to cover the electrodes; and a phosphor layer formed on the substrate on the back side and emitting light by discharge. When a dielectric layer is formed by applying and baking a dielectric paste having a binder resin and glass frit, the air present in the dielectric paste is first oxygenated. A dielectric layer is formed by firing and then firing the dielectric paste while supplying oxygen .
[0014]
According to a second aspect of the present invention, in the first aspect, the dielectric paste is applied by disposing the dielectric paste previously processed into a sheet shape on the substrate.
[0015]
Hereinafter, a method for manufacturing a plasma display apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3, the same parts as those shown in FIGS. 4 to 6 are denoted by the same reference numerals.
[0016]
In the front panel of the plasma display device according to the present invention, the display electrode 4 is first formed on the substrate 1 and then covered with the dielectric layer 6. Further, the protective layer 7 made of MgO is formed on the surface of the dielectric layer 6. It is produced by forming.
[0017]
The dielectric layer 6 is formed by applying a dielectric paste containing a lead-based glass frit and a binder resin by screen printing and then baking at a predetermined temperature for a predetermined time, for example, 560 ° C. for 20 minutes. (About 20 μm). Examples of the dielectric paste containing the lead glass frit include PbO (70 wt%), B ₂ O ₃ (15 wt%), SiO ₂ (10 wt%), and Al ₂ O ₃ (5 wt%) and a binder resin. A mixture of (alpha-terpineol with 10% ethyl cellulose dissolved) is used. Here, the binder resin is obtained by dissolving a resin in an organic solvent. In addition to ethyl cellulose, an acrylic resin can be used as the resin, and butyl carbitol can be used as the organic solvent. Furthermore, you may mix a dispersing agent (for example, glyceryl trioleate) in such binder resin.
[0018]
First, in the present invention, a dielectric paste is applied to form a dielectric paste film 20 as shown in FIG. The dielectric paste used here is made by kneading glass frit, binder resin, organic solvent, etc., and since it contains air in the manufacturing stage of this dielectric paste, the applied dielectric paste film 20 also includes air 21.
[0019]
Thereafter, an oxygen-enriched gas is supplied to the dielectric paste film 20 to replace the air 21 in the dielectric paste film 20 with oxygen 22 as shown in FIG. As shown, firing is performed while supplying oxygen 23. As a result, combustion of the binder resin in the film is promoted by the substituted oxygen 22 in the dielectric paste film 20, the residual carbon remaining by the combustion is reduced, and the oxygen 22 is consumed 100% for the combustion. It is possible to reduce the generation of bubbles. Therefore, by reducing the residual carbon and micro bubbles, it is possible to improve the dielectric transmittance and withstand voltage characteristics.
[0020]
That is, in the present invention, the air 21 dissolved in the dielectric paste film 20 used for forming the dielectric layer is replaced with oxygen 22 and then baked, so that the transmittance of the dielectric layer is improved and the withstand voltage is increased. A panel having excellent characteristics can be manufactured.
[0021]
Note that, when the air 21 dissolved in the dielectric paste film 20 is replaced with oxygen 22, it is not possible to replace all of the air 21, but the combustion of the binder resin in the dielectric paste film 20 can also be achieved by replacing a part of the air. As a result, it is possible to reduce the residual carbon remaining compared to the conventional case and to reduce the generation of microbubbles. Alternatively, the dielectric paste film 20 may be formed by placing a dielectric paste that has been processed into a sheet shape on a substrate.
[0022]
【The invention's effect】
As is apparent from the above description, according to the method for manufacturing a plasma display device according to the present invention, the combustion efficiency of the binder resin can be increased by oxygen introduced into the film and replaced with the air in the film. Since carbon can be reduced and microbubbles derived from nitrogen can be reduced, the transmittance of the dielectric can be improved, and a panel having excellent withstand voltage characteristics can be easily manufactured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a dielectric paste film is formed in a method for manufacturing a plasma display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state of a dielectric paste film after oxygen replacement. FIG. 3 is a cross-sectional view showing a state of firing a dielectric paste film. FIG. 4 is a perspective view showing a part of the panel structure of the plasma display device. FIG. 5 is cut along line AA in FIG. FIG. 6 is a sectional view taken along line BB in FIG. 4. FIG. 7 is a wiring diagram showing an electrode arrangement of the apparatus.
DESCRIPTION OF SYMBOLS 1, 8 Substrate 2 Scan electrode 3 Sustain electrode 2a, 3a Transparent electrode 4 Display electrode 5 Black stripe 6 Dielectric layer 7 Protective film 9 Insulator layer 10 Data electrode 11 Partition 12 Phosphor layer 20 Dielectric paste film 21 Air 22 Oxygen

Claims (2)

A pair of front-side and back-side substrates arranged so as to form a discharge space partitioned by a partition wall between the substrates, and a plurality of substrates disposed on the substrate so that discharge occurs in the discharge space partitioned by the partition wall In a method of manufacturing a plasma display device, comprising: a binder resin and glass; and a dielectric layer formed on the substrate so as to cover the electrode, and a phosphor layer formed on the substrate on the back side and emitting light by discharge. When forming a dielectric layer by applying and firing a dielectric paste having frit, the air present in the dielectric paste is first replaced with oxygen, and then the dielectric paste is fired while supplying oxygen. A method of manufacturing a plasma display device, characterized in that a dielectric layer is formed.   The manufacturing method of the plasma display apparatus of Claim 1 which apply | coated the dielectric paste by arrange | positioning the dielectric paste previously processed into the sheet form on a board | substrate.

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