JPH10208645A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the luminance and the white balance simply. SOLUTION: In this plasma display panel, a front plate 1 and a rear plate 2 are provided parallel and opposing each other, plural cells as a display element are formed by barriers 3 provided between both members, and phosphor layers 9 are provided at the specific positions in the cells. In this case, the barriers 3 are formed by a barrier material including at least one of pigments presenting the R, G, and B. Since an element to regulate the luminance and the white balance of each color is included, the process using an excessive member is not increased, so as to realize a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color plasma display panel (hereinafter referred to as PDP) which is a self-luminous flat panel display utilizing gas discharge.

[0002]

2. Description of the Related Art In general, a PDP has a structure in which a pair of electrodes arranged regularly on two opposing glass substrates are provided, and a gas mainly composed of Ne, Xe or the like is sealed between the electrodes. Then, a voltage is applied between these electrodes,
By generating a discharge in a minute cell around the electrode, each cell emits light to perform display. In order to display information, regularly arranged cells are selectively caused to emit light. There are two types of PDPs, a direct current type (DC type) in which the electrodes are exposed to the discharge space, and an alternating current type (AC type) in which the electrodes are covered with an insulating layer. And a refresh driving method and a memory driving method.

FIG. 1 shows a configuration example of an AC type PDP. This figure shows the front plate and the rear plate separated from each other. As shown, two glass substrates 1 and 2 are arranged in parallel with each other and face each other, and both become the rear plate. The barriers 3 provided on the glass substrate 2 in parallel to each other are held at a constant interval. On the back side of the glass substrate 1 serving as the front plate, a composite electrode composed of a transparent electrode 4 and a bus electrode 5 serving as a metal electrode is formed parallel to each other, and a dielectric layer 6 is formed to cover the composite electrode. Further, a protective layer 7 (MgO layer) is formed thereon. On the front side of the glass substrate 2 serving as a back plate, address electrodes 8 are formed between the barriers 3 so as to be orthogonal to the composite electrode and parallel to each other. Phosphor layer 9 is provided so as to cover. The AC type PDP is of a surface discharge type, and has a structure in which an AC voltage is applied between composite electrodes on a front panel to discharge by an electric field leaking into a space. In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the phosphor layer 9 is caused to emit light by ultraviolet rays generated by this discharge,
An observer visually recognizes light transmitted through the front plate.

In the back plate of the PDP as described above, an address electrode 8 is formed on a glass substrate 2, a dielectric layer is formed so as to cover the electrode 8 if necessary, and then a barrier 3 is formed. It is manufactured by providing a phosphor layer 9 between the three. As a method for forming the electrode 8, a method of forming a film of an electrode material on the substrate 2 by a vacuum evaporation method, a sputtering method, a plating method, a thick film method, and the like, and patterning the film by a photolithography method, and a method of forming a thick film paste A patterning method using a screen printing method used is known. The dielectric layer is formed by screen printing or the like. The barrier 3 is formed by overprinting by screen printing or a sand blast method, and the phosphor layer 9 is formed between the barriers 3 by screen printing or the like in three colors of red (R), green (G), and blue (B). Is selectively filled, or formed by a photolithography method using a photosensitive phosphor paste.

[0005]

Since the three color phosphors used for color display have different luminances, the phosphors are usually adjusted so as not to vary by changing the amount of the phosphors used. I have. Alternatively, the white balance of the three colors is adjusted by using a color filter on the front surface. However, in the former method, there is a problem that a discharge margin cannot be obtained because the width of the discharge space changes. In the latter method, there is a problem that the number of members and processes increases and the cost increases.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, it is not necessary to change the filling amount of the phosphor for each color by coloring the barrier itself. A PDP that does not use another member is obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a front panel and a rear panel are disposed so as to be parallel to and opposed to each other, and a plurality of cells as display elements are formed by a barrier provided between the two. In a PDP in which a phosphor layer is provided at a predetermined position in each cell, the barrier is formed of a barrier material containing at least one of R, G, and B pigments.

When a black layer is provided on the top of the barrier,
This is effective in preventing external light reflection and improving contrast.

According to the present invention, as described above, for example, if a pigment exhibiting R is added to a barrier material,
The amount of the phosphor of the emission color of R can be reduced. Similarly, if the pigment exhibiting G is added, the amount of the phosphor emitting the G color may be reduced, and if the pigment exhibiting B is added, the amount of the phosphor emitting the B color may be decreased. Further, if these mixtures are added, the amount of the phosphor of each emission color can be reduced according to the ratio of the pigment exhibiting R, G, and B.

A commonly used barrier material paste contains glass frit and a binder resin as main components. Further, as an inorganic component, a filler and an inorganic pigment are mixed in addition to the glass frit. In the present invention, a barrier material paste obtained by mixing a white inorganic pigment and further adding at least one of R, G, and B pigments is used.
Examples of the white pigment include titanium oxide, aluminum oxide, silica, calcium carbonate and the like. The usage ratio of the white pigment is 5 to 2 parts per 100 parts by weight of the glass frit.
It is about 0 parts by weight.

The pigments used for coloring the barriers are of a very large variety, but are typically iron (red), manganese aluminate (pink), gold (pink),
Antimony-titanium-chromium (orange), iron-chromium-
Zinc (brown), iron (brown), titanium-chromium (yellow), iron-chromium-zinc (yellow), iron-antimony (yellow), antimony-titanium-chromium (yellow) , Zinc-vanadium (yellow), zirconium-vanadium (yellow), chromium (green), vanadium-
Chromium (green), cobalt (blue), cobalt aluminate (blue), vanadium-zirconium (blue), cobalt-chromium-iron (black) and the like are generally known. These can be mixed to adjust the color tone.

As the paste for forming the black layer on the top of the barrier, a mixture of a black inorganic pigment is used. As the black inorganic pigment, Co-Cr-Fe, Co-Mn-F
e, Co-Fe-Mn-Al, Co-Ni-Cr-F
e, Co-Ni-Mn-Cr-Fe, Co-Ni-Al
-Cr-Fe, Co-Mn-Al-Cr-Fe-Si,
Cu-Cr-Fe and the like can be mentioned. The usage ratio of the black pigment is about 5 to 20 parts by weight based on 100 parts by weight of the glass frit.

[0013] The filler is an aggregate, and is added as needed. This filler prevents casting during firing,
It is intended to improve the density, is an inorganic powder having a higher softening point than glass frit, for example, aluminum oxide,
Various inorganic powders such as boron oxide, silica, titanium oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide, calcium carbonate, zirconia, and zircon can be used, and those having an average particle size of 0.1 to 20 μm are used. . The inorganic powder may be used in an amount of 0 to 30 parts by weight based on 100 parts by weight of the glass frit.

Next, the binder resin is contained as a binder of an inorganic component. 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, ter
t-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-octyl methacrylate, n-decyl acrylate, n-decyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, styrene, α-methylstyrene, N-vinyl-
Examples thereof include polymers or copolymers of one or more kinds such as 2-pyrrolidone, and cellulose derivatives such as ethyl cellulose. Moreover, a water-soluble resin is also included. Examples of the water-soluble resin include polyvinyl alcohol, poly N-vinylpyrrolidone, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, casein and the like.

The barrier material is dissolved or dispersed in a solvent, applied as a paste, and dried. As the solvent, methanol,
Anones such as ethanol, isopropanol, acetone, methyl ethyl ketone, toluene, xylene and cyclohexanone, 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, and terpenes such as α- or β-terpionaire. .
Further, a plasticizer, a dispersant, an antisettling agent, an antifoaming agent, a leveling agent, a thickener, and the like may be added to the barrier material paste as needed.

The phosphor paste for forming the phosphor layer contains a phosphor and a resin as main components. The resin and the solvent for pasting are the same as for the barrier material paste. Alternatively, it is dissolved or dispersed in the same solvent as that of the barrier material paste, applied as a paste, and dried.

As a phosphor emitting red light, 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, GdBO ₃ : Eu, ScB
O ₃ : Eu, LuBO ₃ : Eu, etc. are exemplified, and as a phosphor emitting green light, Zn ₂ SiO ₄ : Mn, BaA
l ₁₂ O ₁₉ : Mn, SrAl ₁₃ O ₁₉ : Mn, CaAl ₁₂ O
₁₉ : Mn, YBO ₃ : Tb, BaMgAl ₁₄ O ₂₃ : M
n, LuBO ₃ : Tb, GdBO ₃ : Tb, ScB
O ₃ : Tb, Sr ₆ Si ₃ O ₃ Cl ₄ : Eu, etc. are exemplified. As a phosphor having a blue emission color, Y ₂ SiO ₅ : C
e, CaWO ₄ : Pb, BaMgAl ₁₀ O ₁₇ : Eu, B
aMgAl ₁₄ O ₂₃ : Eu and the like are exemplified.

The barrier may be formed by a conventional method. Specifically, the barrier material paste is overprinted in a pattern by screen printing and then fired, and the barrier material paste has sand blast resistance on the barrier forming layer formed by application or transfer from the barrier material sheet. A method in which a mask is formed, sandblasting is performed through the mask to remove unnecessary portions of the barrier forming layer, followed by baking, filling a female material space formed by a resist or the like with a barrier material paste. And a method of baking after removing the female mold, and the like.

The phosphor layer may be formed by a conventional method. Specifically, a screen printing method using a phosphor that has been pasted, a photo process method using a phosphor dispersed in a photosensitive slurry, and a method in which the phosphor is powdered while the photosensitive liquid is not dried. A dusting method of attaching and then exposing and patterning, a photo-adhesion method of selectively adhering powdered phosphor only to the parts that have been patterned using a material that develops adhesiveness by irradiating ultraviolet rays After the phosphor paste is filled in the cell, the unnecessary portion can be removed by sandblasting to leave a phosphor layer on the side surface of the rib, or any other method such as sandblasting.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to an example of an AC type PDP manufacturing process.

First, as shown in FIG. 2A, an address electrode 12 and, if necessary, a dielectric layer (not shown) are formed on a glass substrate 11 serving as a back plate. Next, a barrier material paste having the following composition was applied with a blade coater to a thickness of 420 μm, and dried at 150 ° C. for 50 minutes to form a barrier forming layer 13. The thickness of the barrier forming layer 13 after drying is 180 μm.

<Composition of Barrier Material Paste> Glass powder: PbO—B ₂ O ₃ —SiO ₂ 70% by weight Red pigment: α-Fe ₂ O ₃ needle-shaped powder (“TOR” manufactured by Dainichi Seika Kogyo) 10% by weight % Binder: 2% by weight of cellulosic resin Solvent: 18% by weight of terpineol

Next, the substrate was heated to 80.degree.
As shown in (b), a mask layer 14 was formed by laminating a dry film resist. The dry film resist used was "NCP225" manufactured by Nippon Synthetic Chemical Industry.
It is. Next, as shown in FIG.
Exposure was performed with ultraviolet rays through a line pattern mask 15 having a pitch of 150 μm. Exposure conditions are 364 nm
200 μW / cm ² , irradiation amount 120 when measured by
mJ / cm ² . After the exposure, as shown in FIG. 2D, spray development was performed at a liquid temperature of 30 ° C. using a 1 wt% aqueous solution of sodium carbonate. Line width 50μ by the above process
Thus, a sandblast mask 16 having a pitch of 150 μm was obtained.

Then, as shown in FIG. 2E, an unnecessary portion of the barrier forming layer 13 was removed by performing a sandblasting process through a mask 16. Specifically, alumina # 800 was used as the abrasive, and the abrasive injection amount was 10
Sandblasting was performed under the conditions of 0 g / min, an injection pressure of 3 kgf / cm ² , a distance between the substrate and the nozzle of 100 mm, and a scan speed of 10 mm / sec. After the completion of the sandblasting, the resist was stripped off using a stripping solution. Specifically, a 2% by weight aqueous solution of sodium hydroxide was used as a stripping solution, and sprayed at 30 ° C. Thereafter, firing was performed under the conditions of a peak temperature of 570 ° C. and a holding time of 20 minutes, and FIG.
As shown in (f), the barrier 17 bonded to the glass substrate 11
Was formed.

After the electrodes 12 and the barriers 17 are formed on the glass substrate 11 as described above, phosphor pastes of respective colors are sequentially filled into predetermined cells by screen printing. As a procedure, first, a predetermined phosphor is filled in a predetermined cell by screen printing with a red phosphor paste, and an organic solvent in the phosphor paste is vaporized through a drying process, as shown in FIG. Fluorescent paste 18 is applied to the wall surface of barrier 17 and the bottom
(R) was left. Subsequently, the respective steps of filling and drying are repeated for green and blue phosphor pastes, and FIG.
As shown in (b), the three-color fluorescent paste 18 (R),
18 (G) and 18 (B) were left in predetermined cells, respectively.

In this embodiment, the phosphor powder of each color is
(Y, Gd) BO ₃ : Eu (“KX-504A” manufactured by Kasei Optonics) in red and Zn ₂ SiO ₄ : Mn in green
(“PI-G1S” manufactured by Kasei Optonics), Ba in blue
MgAl ₁₀ O ₁₇ : Eu (KX-5 manufactured by Kasei Optonics)
01A "). Then, a phosphor paste composed of 50% by weight of a phosphor powder, 4.2% by weight of a resin (ethyl cellulose), and 45.8% by weight of a solvent (terpineol) was used. The viscosity of these phosphor pastes is 40
It was 0 poise.

Finally, the organic component of the phosphor paste was burned off by a baking process at 450 ° C. for 30 minutes. As a result, it was possible to obtain a back plate in which phosphor layers of R, G, and B colors were respectively patterned in predetermined cells.

By combining the back plate on which the phosphor layer is formed and the front plate separately formed, R, G,
Surface-discharge type AC color PDP in which the three primary colors B are visible
Was prepared. AC type color P thus produced
In the DP, the brightness of the discharge space for each color was improved to the same extent, and the white balance was obtained.

[0029]

As described above, the PDP of the present invention
Has formed a barrier with a barrier material containing at least one of pigments exhibiting R, G, and B,
In addition to adjusting the type and amount of the phosphor, or the shape (thickness) of the formed phosphor layer, adjustment on the circuit, etc., additional elements for adjusting the brightness or white balance of each color are added. The cost can be reduced without increasing the number of components and processes.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing an example of a configuration of an AC type plasma display panel in a state where a front plate and a back plate are separated from each other.

FIG. 2 is a process diagram showing a procedure for forming a barrier on a back plate of the AC type plasma display panel.

FIG. 3 is a process chart showing a procedure for forming a phosphor layer on a barrier wall surface and a cell bottom surface formed in FIG. 3;

[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 Phosphor layer 11 Glass substrate 12 Electrode 13 Barrier forming layer 14 Mask layer 15 Line pattern mask 16 Sandblast mask 17 Barrier 18 Phosphor paste

Claims (2)

[Claims] 1. A front panel and a rear panel are disposed so as to be parallel and opposed to each other, and a plurality of cells as display elements are formed by barriers provided between the front panel and the rear panel. A plasma display panel provided with a phosphor layer at a position, wherein the barrier is formed of a barrier material containing at least one of R, G, and B pigments. 2. The plasma display panel according to claim 1, wherein a black layer is provided on top of the barrier.