JPH05314914A - Dc type plasma display panel and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance luminous efficacy of a DC type plasma display panel. CONSTITUTION:A rare earth element oxide and/or a rare earth element boride are provided on a surface of an electrode to be a negative electrode 16. Since the rare earth element oxide and the rare earth element boride have a high secondary electron emission coefficient to decrease a discharge voltage of the negative electrode 16, luminous efficacy P/VI (P:luminous output, V:voltage, I:current) is increased. When a phosphor layer 17 is provided in an inner wall of a cell barrier 13, the wall surface of the cell barrier 17 emits light to generate visible light. Since this visible light is transmitted through a front face plate 11, luminous output is increased to further increase the luminous efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC type plasma display panel (hereinafter referred to as PDP) which is a self-luminous type flat display using gas discharge and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, research on flat displays has been actively conducted, but PDPs are regarded as the most promising future large-sized wall-mounted televisions. Especially DC type P
Since the DP has a simpler structure than the AC PDP and is relatively easy to manufacture, it is extremely advantageous for increasing the size. Furthermore, it has excellent high-speed responsiveness, and has recently realized high-gradation display.

FIG. 1 shows a structural example of a conventional color DC type PDP. As shown in the figure, in this DC type PDP, a flat plate-shaped front plate 1 and a rear plate 2 made of glass are arranged in parallel and opposite to each other, and a cell provided between them. It is held at a constant interval by the barrier 3. Further, a plurality of anodes 4 parallel to each other are formed on the back surface of the front plate 1, and a plurality of cathodes 5 parallel to each other are formed on the front surface side of the back plate 2 orthogonal to the anodes 4. .. Further, a fluorescent layer 6 is formed adjacent to both sides of the anode 4, and the fluorescent layer 6 emits red (R), green (G), and blue (B) light for each cell 7 as a display element. Colored phosphors are provided separately. As the material of the cathode 5, a metal such as Ni, Al, LaB ₆ is used.

In the conventional DC type PDP described above, the anode 4
When a predetermined voltage is applied between the cathode 5 and the cathode 5, the positive ions are attracted to the cathode 5 and the negative electrons are attracted to the anode 4 to generate a discharge, thereby forming an electric field, and the ions excited in this electric field are grounded. Ultraviolet rays are emitted when returning to the state. Then, this ultraviolet ray is generated in all directions, of which the ultraviolet ray impinging on the fluorescent layer 6 excites the phosphor to generate visible light so that an observer visually recognizes this visible light transmitted through the front plate 1. Is becoming

[0005]

By the way, the luminous efficiency of the DC type PDP as described above is generally P / VI (P:
Light emission output, V: voltage, I: current). That is,
Increasing the light emission output (P) and lowering the discharge voltage (V) are effective means for improving the light emission efficiency. The present invention has been improved from this point of view to provide a DC PDP with high light emission efficiency. It is intended to provide a manufacturing method therefor.

[0006]

In order to achieve the above object, in the DC type PDP of the present invention, both the front plate and the back plate, each having an electrode, are parallel and opposed to each other with the electrode side inside. In such a DC type plasma display panel in which a plurality of cells as display elements are formed by the cell barriers provided between the both substrates, a rare earth element oxide and / or The feature is that rare earth element borate is mixed.

Here, as the rare earth element oxide, oxides of yttrium (Y), gadolinium (Gd) and europium (Eu) can be used, and as the rare earth element borate, yttrium (Y) is used. , Gadolinium (Gd), and europium (Eu) borate can be used.

In addition, a fluorescent layer is provided on the inner wall of the cell barrier, and fluorescent layers having red, green, and blue emission colors can be distributed to each cell.

In the method for producing a DC type PDP of the present invention, compressed air or nitrogen mixed with a rare earth element oxide and / or a rare earth element borate is blown onto the cathode surface,
DC type PDP having the above-mentioned structure by mixing rare earth element oxide and / or rare earth element borate in the cathode material
To manufacture.

In another manufacturing method, a mixture of a phosphor and a rare earth element oxide and / or a rare earth element borate in a solvent containing an organic binder is filled in a predetermined cell and then sandblasted. By forming a fluorescent layer on the wall surface by the method and mixing the rare earth element oxide and / or the rare earth element borate in the cathode material, the DC PDP having the above structure is manufactured.

In still another production method, a mixture of a rare earth element oxide and / or a rare earth element borate dispersed in a solvent containing an organic binder is applied on the cathode, and then the rare earth element is applied to the cathode material by a sandblast method. By mixing the element oxide and / or the rare earth element borate, the DC PDP having the above configuration is manufactured.

[0012]

In the above-described DC type PDP of the present invention, the rare earth element oxide and / or the rare earth element borate having a high secondary electron emission coefficient, which are mixed on the surface of the cathode material, cause the discharge voltage (V) of the cathode. The luminous efficiency (P / VI) is increased by acting so as to decrease.

In the case where the fluorescent layer is provided on the inner wall of the cell barrier, the wall surface of the cell barrier emits light and this visible light passes through the front plate, so that the light emission output (P) is increased and the light emission efficiency (P) is increased. P / VI) is increased.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings.

[Embodiment 1] FIG. 2 shows a DC type P according to the present invention.
It is sectional drawing which shows one Example of DP, and has shown the cross section of the direction different from the case of FIG. As shown in the figure,
In this DC type PDP, a glass front plate 11 and a rear plate 12 which are two substrates are arranged in parallel and opposite to each other, and a cell barrier 13 provided between the two plates. The gap between the front plate 11 and the back plate 12 is maintained at a constant gap, and a plurality of cells 14 as display elements are formed. Further, anodes 15 parallel to each other are formed on the back side of the front plate 11, while a plurality of cathodes 16 parallel to each other are formed on the front side of the back plate 12 orthogonal to the anodes 15. .. Furthermore, the fluorescent layer 1
7 are formed on the inner wall of the cell barrier 13. The front plate 11 and the rear plate 12 are completely hermetically sealed, and
A gas composed of -Xe (Xe 3%) is enclosed.

In this embodiment, the back plate 12 in the DC type PDP having the above structure is manufactured by the steps shown in FIGS. First, as shown in (1) of FIG. 3, a film thickness of about 20 is formed by screen printing on the back plate 12 using Ni paste.
After forming the electrode 18 having a predetermined pattern of μm, 170 ° C.
To dry. Then, dry compressed air is mixed with a sintered body of yttrium oxide (Y ₂ O ₃ ) as a rare earth element oxide, and this is sprayed onto the back plate 12 on which the electrode 18 is formed, as shown in (2). .. The condition for spraying the Y ₂ O ₃ powder was a pressure of 0.5 kg / cm ² . This is to prevent the electrode 16 from being damaged by spraying the powder with too strong pressure. Then 580
The sintering at a temperature of ℃ makes it possible to form the cathode 16 in which Y ₂ O ₃ is mixed on the Ni surface.

After forming the cathode 16 as described above,
As shown in (3), the cell barrier 13 having a height of about 200 μm
Are laminated by screen printing and fired at 580 ° C. After the cell barrier 13 is formed, the fluorescent layer 1 is formed on the inner wall of the cell barrier 13.
Moving to the step of forming 7. First, a paste in which phosphors having emission colors of R, G, and B are dispersed in a solvent containing an organic binder is prepared, and the paste 19 is screen-printed in an arbitrary cell space as shown in (4). To fill each. In this case, pattern filling is performed so that R, G, and B cells have a predetermined array. The phosphor paste 19 used here was prepared by using 50 wt% of the phosphor, 40 wt% of ethyl cellulose as an organic binder, and 10 wt% of terpineol as a solvent.

Various kinds of phosphors can be used as the above-mentioned phosphor, for example, Y ₂ O ₃ : Eu for red,
Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃
(PO ₄ ) ₂ : Mn, YBO ₃ : Eu, (Y, Gd) B
O ₃ : Eu, GdBO ₃ : Eu, ScBO ₃ : Eu, L
uBO ₃ : Eu and the like, and Y ₂ SiO ₅ : C as blue
e, CaWO ₄ : Pb, BaMgAl ₁₄ O ₂₃ : Eu, etc., and green as Zn ₂ SiO ₄ : Mn, BaAl ₁₂ O
₁₉ : Mn, SrAl ₁₃ O ₁₉ : Mn, ZnAl ₁₂ O ₁₉ : M
n, CaAl ₁₂ O ₁₉ : Mn, YBO ₃ : Tb, BaMg
Al ₁₄ O ₂₃ : Mn, LuBO ₃ : Tb, GdBO ₃ : T
b, ScBO ₃ : Tb, Sr ₆ Si ₃ O ₃ Cl ₄ : Eu
Etc. are preferably used.

After filling the phosphor paste 19, 170
Dry at ℃. During this drying, about 70% by volume of the solvent is vaporized, so that the concentrated phosphor paste 19 remains, as shown in (1) of FIG. Then
As shown in (2), by using # 600 glass beads as an abrasive and sandblasting at a pressure of 1 kg / cm ² , the phosphor paste 19 on the surface of the cathode 16 is removed to form a phosphor layer 17 on the wall surface. To do. At the stage of this sand blasting treatment, the cathode 16 has been baked, so its surface is hardly damaged. After that, 450 ℃
Then, the phosphor layer 17 was bound to the inner wall of the cell barrier 13 by firing at (3).

The back plate 12 prepared as described above and the front plate 11 prepared separately are arranged and sealed such that the electrode surfaces face each other and the electrodes are orthogonal to each other, and He-Xe (Xe3
%) Gas was sealed at 230 Torr to prepare a DC PDP.

FIG. 5 shows the voltage-current characteristics of the DC type PDP manufactured in this example and the conventional DC type PDP having the cathode of only Ni. As can be seen from the figure, D of the present embodiment
The C-type PDP (shown by a) can be reduced in voltage by about 50 V as compared with the conventional DC-type PDP (shown by b). Further, by providing the fluorescent layer 17 on the wall surface of the cell barrier 13, a light emission output about twice as high as that of the conventional transmissive type was obtained.

Although Ni was used as the cathode material in the present embodiment, other materials such as Al and LaB ₆ having sputter resistance are also used.
Etc. can also be used. Further, as the rare earth element oxide, oxides of gadolinium (Gd) and europium (Eu) can be used in addition to the above Y ₂ O ₃ .
Furthermore, yttrium (Y), gadolinium (Gd),
A borate of europium (Eu) can also be used. And one of these oxides or borate
One kind or a mixture of plural kinds may be used.

[Embodiment 2] In this embodiment, as a method of mixing Y ₂ O ₃ on the surface of the cathode 16, after forming the electrode 18 made of Ni and the cell barrier 13 on the back plate 12, the embodiment 1 Using the mixture of Y ₂ O ₃ mixed in the phosphor paste described in 1., sandblasting is performed under the same conditions as in Example 1 to form a discharge space, and Y ₂ O ₃ is mixed in the Ni electrode layer. I adopted the method of making. The Ni electrode layer is in a porous state after firing, and the phosphor and Y ₂ O ₃ particles enter the pores. In this case, the phosphor paste in the mixture obtained by mixing Y ₂ O ₃ is the phosphor 30 wt%, the sintered body 20wt of Y ₂ O ₃
%, Organic binder 10 wt%, and solvent 10 wt%. The DC-type PDP manufactured in this example also had the same characteristics as in the case of Example 1.

In this embodiment, when an yttrium compound such as Y ₂ O ₃ : Eu, (Y, Gd) BO ₃ : Eu is used as the red phosphor, the phosphor itself has the effect of lowering the discharge voltage. Therefore, it is not necessary to specifically mix the sintered body of Y ₂ O ₃ .

[Embodiment 3] In this embodiment, the back plate 12 side is manufactured in the process shown in FIG. First, as shown in (1), a Ni-paste is used to form an electrode 18 having a predetermined pattern with a film thickness of about 20 μm on the back plate 12 by screen printing, and the electrode 18 is dried at 170 ° C., and then shown in (2). like,
A mixture 20 in which Y ₂ O ₃ is dispersed in a solvent containing an organic binder is applied to the upper portion of the electrode 18 by a screen printing method and baked. However, in such a state, Y ₂ O
Layer ₃ covers the electrode as an insulator,
No discharge occurs even if it is used as the cathode of a C-type PDP.
Therefore, it is necessary to expose the discharge space Ni surface at a constant rate, in the present embodiment, by grinding the layer of Y ₂ O ₃ by sandblasting as shown in (3),
Cathode 1 with the Ni electrode surface exposed as shown in (4)
6 was formed. Then, as shown in (5), the height is about 2
A cell barrier 13 of 00 μm was formed by screen printing lamination.

Then, in the same manner as described in Example 1, the phosphor paste is filled in the cell space, dried and then sandblasted to form a phosphor layer on the inner wall of the cell barrier 13. In this case, the sandblasting conditions were such that Y ₂ O ₃ of the cathode 16 did not peel off. The DC characteristic PDP manufactured by using this back plate 12 also had the VI characteristic similar to that of the first embodiment.

In the third embodiment, the fluorescent layer 17 may not be provided on the rear plate 12 side, but a fluorescent layer may be provided on the front plate 11 to form a conventional transmissive type.

[0028]

Since the present invention is configured as described above, it has the following effects.

In the DC type PDP of the present invention, since the rare earth element oxide and / or the rare earth element borate are mixed on the surface of the electrode serving as the cathode, the rare earth element oxide and / or the rare earth element oxide having a high secondary electron emission coefficient are used. Or, since the rare earth element borate lowers the discharge voltage of the cathode, the conventional DC PDP
It is possible to obtain higher luminous efficiency than that of. Further, this also makes it possible to reduce the load on the PDP drive circuit.

By providing the fluorescent layer on the inner wall of the cell barrier, the area of the fluorescent screen is increased, and the reduction of the light amount at the time of transmission unlike the case of the transmissive fluorescent layer is eliminated, so that the light emission output is obtained. The luminous efficiency can be further increased by further increasing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional DC type plasma display panel.

FIG. 2 is a sectional view showing an embodiment of a DC type plasma display panel according to the present invention.

FIG. 3 is a process drawing showing a procedure for manufacturing a back plate in the DC type plasma display panel shown in FIG.

FIG. 4 is a process diagram that follows FIG.

FIG. 5 is a diagram showing a voltage-current characteristic of the DC type plasma display panel of the present invention in comparison with a conventional one.

FIG. 6 is a process drawing showing another procedure for manufacturing the back plate in the DC type plasma display panel shown in FIG.

[Explanation of symbols]

 11 Front Plate 12 Back Plate 13 Cell Barrier 14 Cell 15 Anode 16 Cathode 17 Fluorescent Layer

Claims (7)

[Claims] 1. A front plate and a back plate, each of which is provided with an electrode, are arranged in parallel and opposite to each other with the electrode side as an inner side, and as a display element by a cell barrier provided between the both substrates. DC consisting of multiple cells
Type plasma display panel, wherein a rare earth element oxide and / or a rare earth element borate are mixed on the surface of an electrode serving as a cathode. 2. The rare earth element oxide includes yttrium (Y), gadolinium (Gd), and europium (E).
2. The DC type plasma display panel according to claim 1, wherein the oxide of u) is used. 3. The DC type plasma display according to claim 1, wherein a borate of yttrium (Y), gadolinium (Gd) or europium (Eu) is used as the rare earth element borate. panel. 4. The fluorescent layer is provided on the inner wall of the cell barrier, and the fluorescent layers respectively having red, green, and blue emission colors are distributed to each of the cells. , 2 or 3 DC type plasma display panel. 5. The method for manufacturing a DC type plasma display panel according to claim 1, 2, 3 or 4, wherein compressed air or nitrogen mixed with a rare earth element oxide and / or a rare earth element borate is used as a cathode surface. And a rare earth element oxide and / or a rare earth element borate are mixed in the cathode material. 6. The method of manufacturing a DC type plasma display panel according to claim 1, 2, 3 or 4, wherein the phosphor and the rare earth element oxide and / or the rare earth element boric acid are contained in a solvent containing an organic binder. After filling a predetermined cell with a mixture in which the substances are dispersed, a fluorescent layer is formed on the wall surface by the sandblast method and the rare earth element oxide and / or the rare earth element borate is mixed in the cathode material. Method for manufacturing DC type plasma display panel. 7. The method of manufacturing a DC type plasma display panel according to claim 1, 2, 3 or 4, wherein the rare earth element oxide and / or the rare earth element borate is dispersed in a solvent containing an organic binder. A method for manufacturing a DC type plasma display panel, comprising applying the mixture thus obtained on a cathode and then mixing a rare earth element oxide and / or a rare earth element borate in the cathode material by a sandblast method.