JP3628129B2 - Method for manufacturing plasma display panel member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing process of a plasma display panel (PDP), and more particularly to a method of manufacturing a PDP member as a back plate or a front plate constituting the PDP.
[0002]
[Prior art]
In general, a PDP has a structure in which a pair of electrodes regularly arranged on two opposing glass substrates are provided, and a gas mainly composed of Ne, Xe, or the like is enclosed therebetween. Then, a voltage is applied between these electrodes, and discharge is generated in minute cells around the electrodes, thereby causing each cell to emit light for display. In order to display information, cells arranged regularly are selectively discharged. There are two types of PDPs: a DC type (DC type) with electrodes exposed in the discharge space and an AC type (AC type) covered with an insulating layer, both of which vary depending on the display function and driving method. Further, it is classified into a refresh driving method and a memory driving method.
[0003]
FIG. 1 shows an example of the configuration of an AC type PDP. This figure shows a state in which the front plate and the back plate are separated from each other. As shown in the figure, two glass substrates 1 and 2 are arranged in parallel and facing each other, and both serve as a back plate. The glass substrate 2 is held at a constant interval by barriers 3 provided in parallel to each other. A composite electrode composed of a transparent electrode 4 and a bus electrode 5 which is a metal electrode is formed in parallel on the back side of the glass substrate 1 which is a front plate, and a dielectric layer 6 is formed covering the composite electrode. Further, a protective layer 7 (MgO layer) is formed thereon. Further, on the front side of the glass substrate 2 serving as a back plate, address electrodes 8 are formed in parallel with each other so as to be perpendicular to the composite electrode, and a dielectric layer 9 is formed thereon. The phosphor 10 is formed so as to cover the wall surface of the barrier 3 and the cell bottom surface. This AC type PDP is a surface discharge type, and has a structure in which an AC voltage is applied between the composite electrodes on the front plate and an electric field leaks into the space. In this case, since alternating current is applied, the direction of the electric field changes corresponding to the frequency. And the fluorescent substance 10 is light-emitted by the ultraviolet-ray which arises by this discharge, and an observer visually recognizes the light which permeate | transmits a front plate.
[0004]
In the PDP as described above, the address electrode 8 is formed on the glass substrate 2, the dielectric layer 9 is formed so as to cover it, the barrier 3 is formed, and the phosphor is interposed between the barriers 3. It is manufactured by filling 10. As an electrode forming method, a film of an electrode material was formed on a substrate by a vacuum deposition method, a sputtering method, a plating method, a thick film method, etc., and this was patterned by a photolithography method, and a thick film paste was used. A patterning method using a screen printing method is known. The dielectric layer 9 is applied by screen printing. The barrier is formed by overprinting by screen printing, sandblasting, or the like, and the phosphor is selectively filled between the barriers by screen printing.
[0005]
[Problems to be solved by the invention]
By the way, in order to spread the PDP, it is necessary to reduce the product price by increasing the productivity and manufacturing the PDP at a low cost. However, as described above, for example, even if one back plate is taken, the manufacturing process is complicated, and it is difficult to reduce the cost unless such a process is changed.
[0006]
The present invention has been made in response to the above-described demands, and has an object to provide a method of manufacturing a PDP member in which the process is simplified and the cost is reduced in order to reduce the product price of the PDP. Specifically, a method for forming a barrier and a phosphor positioned therebetween on a substrate is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a method of manufacturing a PDP member according to the present invention includes a nozzle that discharges a barrier material paste and three types of phosphor material pastes that respectively correspond to red, green, and blue emission colors. By aligning the nozzles in a regular row and running all the nozzles simultaneously while discharging the paste from each nozzle, the phosphor material pastes of the three colors are regularly arranged with the barrier material paste in between. It includes a step of applying four types of paste on a substrate and then firing the entire paste.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 is an explanatory view showing a state where a barrier material paste and a phosphor material paste are discharged onto a substrate from a large number of nozzles arranged in a line, and FIG. 3 is a cross-sectional view showing the substrate on which each paste is applied.
[0009]
In FIG. 2, 11 is a nozzle that discharges the barrier material paste 21, and 12, 13, and 14 are nozzles that discharge phosphor material pastes 22, 23, and 24 corresponding to red, green, and blue emission colors, respectively. The nozzles are configured to run on the substrate 15 simultaneously in the direction of the arrow. And the discharge port of each nozzle is set so that it may become the space | interval of 1/2 of the pitch of a barrier. The relative discharge amount of the barrier material paste 11 and the phosphor material pastes 22 to 24 is determined by the width of the barrier. Also, since the two are in contact with each other and are not mixed with each other, they are applied in a band shape, so that the traveling speed of the nozzle group is determined by the height of the barrier.
[0010]
The barrier material paste is mainly composed of glass frit and resin. As the glass frit, a glass frit having a softening point of 350 to 650 ° C. and a thermal expansion coefficient α ₈₀₀ of 60 to 100 × 10 ⁻⁷ / ° C. is used. If the softening point of the glass frit exceeds 650 ° C., it is necessary to increase the firing temperature, and it is not preferable because it may be thermally deformed depending on the object to be laminated. The glass frit is fused, and voids are generated in the layer. Further, if the thermal expansion coefficient is outside the range of 60 to 100 × 10 ⁻⁷ / ° C., in the case of PDP, the difference from the thermal expansion coefficient of the glass substrate is large, and distortion is caused. In addition to the glass frit, two or more inorganic powders and inorganic pigments may be mixed and used as the inorganic component.
[0011]
The inorganic powder is a bone agent and is added as necessary. This inorganic powder is intended to prevent casting during casting and to improve denseness, and has a softening point higher than that of glass frit. For example, aluminum oxide, boron oxide, silica, titanium oxide, magnesium oxide, oxidation Various inorganic powders such as calcium, strontium oxide, barium oxide, and calcium carbonate can be used, and those having an average particle diameter of 0.1 to 20 μm are used. The use ratio of the inorganic powder is preferably 0 to 30 parts by weight of the inorganic powder with respect to 100 parts by weight of the glass frit.
[0012]
The inorganic pigment is added as necessary to reduce external light reflection of the PDP and improve the practical contrast. For example, in the case of a dark color, a Co— Cr-Fe, Co-Mn-Fe, Co-Fe-Mn-Al, Co-Ni-Cr-Fe, Co-Ni-Mn-Cr-Fe, Co-Ni-Al-Cr-Fe, Co-Mn- Al-Cr-Fe-Si etc. are mentioned. Examples of the fire resistant white pigment include titanium oxide, aluminum oxide, silica, calcium carbonate and the like.
[0013]
Next, the resin is incorporated as a binder for inorganic components and for the purpose of improving transferability. For example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl Acrylate, isopropyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, n-pentyl acrylate, n-pentyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, n-octyl acrylate, n-o It consists of one or more of til methacrylate, n-decyl acrylate, n-decyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, etc. Examples thereof include polymers or copolymers, and cellulose derivatives such as ethyl cellulose. Moreover, water-soluble resin is also mentioned. Examples of the water-soluble resin include polyvinyl alcohol, poly N-vinyl pyrrolidone, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, and casein.
[0014]
The barrier material is dissolved or dispersed in a solvent, applied as a paste, and dried. Solvents include methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, toluene, xylene, cyclohexanone and other anones, methylene chloride, 3-methoxybutyl acetate, ethylene glycol monoalkyl ethers, ethylene glycol alkyl ether acetates, diethylene glycol monoalkyl. Ethers, diethylene glycol monoalkyl ether acetates, propylene glycol monoalkyl ethers, propylene glycol monoalkyl ether acetates, dipropylene glycol monoalkyl ethers, dipropylene glycol monoalkyl ether acetates, α- or β-terpioneel, etc. Terpenes. Moreover, you may add a plasticizer, a dispersing agent, an anti-settling agent, an antifoamer, a leveling agent, a thickener etc. to a barrier material paste as needed.
[0015]
The phosphor material paste contains phosphor and resin as main components. The resin and the solvent for pasting are the same as in the case of the barrier material paste. Alternatively, it is dissolved or dispersed in the same solvent as in the case of the barrier material paste, applied as a paste, and dried.
[0016]
As the phosphor, an inorganic phosphor that is excited by ultraviolet light and emits light is used. For example, when the emission color is red, Y ₂ O ₃ : Eu, Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : Mn, YBO ₃ : Eu, (Y , Gd) BO ₃ : Eu, ScBO ₃ : Eu, LuBO ₃ : Eu, and the like.
[0017]
The light emission color is as follows: Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O ₁₉ : Mn, SrAl ₁₃ O ₁₉ : Mn, CaAl ₁₂ O ₁₉ : Mn, YBO ₃ : Tb, BaMgAl ₁₄ O ₂₃ : Mn, LuBO ₃ : Tb, GdBO ₃ : Tb, ScBO ₃ : Tb, Sr ₆ Si ₃ O ₃ Cl ₄ : Eu, etc.
[0018]
Examples of the blue emission color include Y ₂ SiO ₅ : Ce, CaWO ₄ : Pb, BaMgAl ₁₄ O ₂₃ : Eu, and the like.
[0019]
Specifically, a paste having the following composition A may be used as the barrier material paste, and a paste having the following composition B may be used as the phosphor material paste.
[0020]
<Composition A>
Lead borosilicate glass 60 parts by weight Zirconia (ZrO ₂ ) 10 parts by weight Inorganic black pigment (Fe, Mn, Cr) 10 parts by weight Ethyl cellulose 5 parts by weight Dimethyl phthalate 1 part by weight Propylene glycol monoethyl ether 20 parts by weight
<Composition B>
Phosphor 30 parts by weight Blue BaMg ₂ Al ₁₄ O ₂₃ : Eu
Green Zn ₂ SiO ₄ : Mn
Red Y ₂ O ₂ : Eu
Ethyl cellulose 40 parts by weight Dimethyl phthalate 5 parts by weight Propylene glycol monoethyl ether 25 parts by weight
As shown in FIG. 3, the barrier material paste 21 and the phosphor material pastes 22 to 24 are patterned in a line shape on the substrate 15 and then dried, and then the entire paste is baked. Through this baking process, as shown in FIG. 4, the resin component is blown from the barrier material paste, the barrier 31 is bound to the substrate 15, and the organic component in the phosphor material layer is burned out, and red, green, respectively. The phosphors 32, 33, and 34 having a blue emission color are bound to the wall surface of the barrier 31 and the cell bottom surface.
[0023]
Although not shown in the drawings, a base layer may be formed on the substrate 15 with a glass paste or the like if necessary, and electrodes are formed by a screen printing method or a photolithography method using a photosensitive material. A dielectric layer may be provided if necessary. For such a substrate, the barrier material paste and the phosphor material paste are patterned thereon, and then dried, and then the entire paste is baked.
[0024]
【The invention's effect】
As described above, according to the present invention, the barrier material paste and the phosphor material paste are regularly discharged onto the substrate from the nozzles arranged in a line, thereby patterning both, and the discharged paste is baked easily. Since the barrier and the phosphor can be formed in a simple process, the manufacturing process of the PDP member provided with these can be simplified and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a structural diagram showing a configuration example of an AC type plasma display panel in a state in which a front plate and a back plate are separated from each other.
FIG. 2 is an explanatory diagram showing a state in which a barrier material paste and a phosphor material paste are discharged onto a substrate from a large number of nozzles arranged in a row.
FIG. 3 is a cross-sectional view showing a substrate coated with a paste.
FIG. 4 is a cross-sectional view showing a substrate after firing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front plate 2 Back plate 3 Barrier rib 4 Sustain electrode 5 Bus electrode 6 Dielectric layer 7 Protective layer (MgO layer)
8 Address electrode 9 Dielectric layer 10 Phosphor 11 Nozzle (for barrier material paste)
12, 13, 14 nozzle (for phosphor material paste)
15 Substrate 21 Barrier material paste 22, 23, 24 Phosphor material paste 31 Barrier 32, 33, 34 Phosphor

Claims (1)

The nozzles that discharge the barrier material paste and the three types of nozzles that discharge the phosphor material pastes corresponding to the red, green, and blue emission colors are regularly arranged in a line, and all nozzles are discharged while discharging the paste from each nozzle. The four types of pastes are applied on the substrate so that the phosphor material pastes of the three colors are regularly arranged with the barrier material paste interposed therebetween, and then the whole paste is fired. A method for producing a plasma display panel member, comprising:

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