JP3703999B2 - Method for producing cathode for plasma display panel - Google Patents

Method for producing cathode for plasma display panel Download PDF

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Publication number
JP3703999B2
JP3703999B2 JP21307199A JP21307199A JP3703999B2 JP 3703999 B2 JP3703999 B2 JP 3703999B2 JP 21307199 A JP21307199 A JP 21307199A JP 21307199 A JP21307199 A JP 21307199A JP 3703999 B2 JP3703999 B2 JP 3703999B2
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Japan
Prior art keywords
cathode
display panel
plasma display
bao
sro
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JP21307199A
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Japanese (ja)
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JP2001043806A (en
Inventor
瑞芳 後沢
秀臣 松崎
晃一 古山
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Toshima Manufacturing Co Ltd
Japan Broadcasting Corp
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Toshima Manufacturing Co Ltd
Japan Broadcasting Corp
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Priority to JP21307199A priority Critical patent/JP3703999B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、プラズマディスプレイパネル用に使用される陰極の製造方法に係り、とくに低電圧で安定に放電し長寿命な陰極の製造方法に関するものである。
【0002】
【従来の技術分野】
プラズマディスプレイパネルにはDC型とAC型とがあるが、陰極にはそれぞれ、DC型にはAlが、AC型にはMgOが使用されている。
そのほかに、低電圧で放電できる陰極材料としてLaCaCrO3 やLaSrCoO3 、LaSrMnO3 などがある。
また、パイロットランプなどでは、BaCO3 を加熱分解して得られるBaOを使用している。
また、Ba(N32 を加熱分解して得られる金属Baを陰極とする報告もある
【0003】
【発明が解決しようとする課題】
従来の陰極では、プラズマディスプレイパネル用の陰極としての十分な特性が得られていなかった。すなわち、放電電圧が高い、安定に放電しない、寿命が短い、パネルへの導入が難しいといった課題があった。
たとえば、Alは高ガス圧・抵抗付構造で長寿命化を達成したが、放電電圧が高い。
LaSrCoOは低電圧であるが、放電の集中により安定に放電せず、短寿命である。
BaCOからBaOを得るためには、非常に高い温度で加熱分解しなければならず、プラズマディスプレイパネルへの導入が難しい。
Ba(Nを加熱分解して得られる金属Baを陰極とした場合、低電圧で放電するが、寿命の点で問題があった。
そこで本発明の目的は、プラズマディスプレイパネルへの導入が容易で、かつ、パネルの陰極としての特性に優れている、すなわち放電電圧が低く、安定に放電し長寿命であるプラズマディスプレイパネル用陰極の製造方法を提供せんとするものである。
【0004】
【課題を解決するための手段】
この目的を達成するため、本発明プラズマディスプレイパネル用陰極の製造方法は、当該方法が以下の手順すなわち:BaO もしくはSrOの少なくとも1つ、またはBaO もしくはSrOの少なくとも1つとCaO もしくは希土類酸化物の少なくとも1つとの組み合わせを下地金属表面に形成する手順と;これを真空中で加熱する手順と;そののち希ガス中で前記パネル完成後の通常の動作電流よりも大きい電流で活性化の目的で放電させて形成する手順とを含むことを特徴とする。
【0005】
【発明の実施の形態】
以下添付図面を参照し実施例により本発明の実施の形態を詳細に説明する。
図1に本発明プラスマディスプレイパネル用陰極製造方法に係るパネルの製造手順一例の流れ図を、図2に上記手順により製造されたDC型プラズマディスプレイパネルを構成する1セルの断面図を示す。
以下図1図示の手順に従い図2図示構成図を使用して本発明に係るパネル製造の一実施例を説明する。
【0006】
前面板上に下地電極などを形成(11)
前面板26上に厚膜印刷や真空蒸着、ホトリソグラフィなどで下地電極22など陰極以外を形成しておく。下地電極は蒸着または厚膜印刷されたAlやNi電極である。
下地電極上にBaO 2 塗布(12)
次にこの下地電極22の上に、電極を覆うように数μm以下の粒径からなる粉体のBaO2 とスクリーンオイルとで粘度の調整されたペーストを厚膜印刷する。
背面板上に陽極・隔壁・蛍光体形成(13)
背面板27にはあらかじめ陽極23、隔壁25、蛍光体24などを形成しておく。
【0007】
フリット塗布・組立(14)
前面板と背面板とを低融点ガラスからなる結晶化タイプのフリットを用いて組立てる。
封着・排気(15)
次に、封着と排気を同時に行う。真空装置に接続された電気炉内で封着温度にまで加熱し、フリットの結晶化が完了後、温度を保ちながら真空排気を行う。このときの排気時間は1時間程度である。真空中での加熱により、BaO2 は分解してBaOとO2 になり、O2 は排気されてBaOが残ると思われる。
ガス導入・チップオフ(16)
その後、常温まで、温度を下げた後、Xeを10%混合したHeガスを200Torr封入しチップオフする。
【0008】
大電流で放電(17)
次に、陰極を活性化するために通常使用する電流より大きな電流で放電をおこす。実験では、通常使用する電流が0.13から0.21A/cm2 であるのに対し、約1.7A/cm2 ですなわち8倍から13倍の電流で放電させた。放電は数秒間ずつ数回行う。
エージング(18)
最後に、電圧が安定するまで、通常使用する放電電流でエージングを行う。
【0009】
このようにして得られたプラズマディスプレイパネルは、図3に示すように、従来使用されてきたAl陰極31と同条件で比較すると、本発明による陰極32は約150V低い電圧で放電することがわかった。
また、1つのセルだけを放電させて、その放電特性を見ると、図4に示すように、1000分間以上放電させても、安定に放電していることがわかった。
ここでは、BaO2 の粉体を厚膜印刷によって、あらかじめ膜厚印刷によって形成されたAl電極上に形成する例を示したが、SrO2 あるいはBaO2 とSrO2 の混合でも同等の効果がある。さらに、CaO2 あるいは希土類酸化物を混合しても同等の効果がある。
また、粉体を塗布する代りにBaO2 、SrO2 などを蒸着で形成しても良い。
さらに、封入ガスとしてHe−Xe(10%)200Torrの例を示したが、他の希ガス、あるいは他の希ガスとの混合ガスでも良い。
【0010】
以上いくつかの実施例について本発明の実施の形態を説明してきたが、本発明はこれら実施例により限定されるものではなく、特許請求の範囲に規定された発明の要旨内で各種の変形、変更の可能なことは当業者に自明であろう。
【0011】
【発明の効果】
本発明のプラズマディスプレイパネル用陰極の製造方法を用いることで、低電圧で駆動でき長寿命なプラズマディスプレイパネルを製作することができる。
【図面の簡単な説明】
【図1】 本発明によるプラズマディスプレイパネル用陰極製造方法に係るパネル製造手順一例の流れ図を示す。
【図2】 本発明手順により製造されたDC型プラズマディスプレイパネルを構成する1セルの断面図を示す。
【図3】 本発明により製造されたプラズマディスプレイパネルの放電特性を従来のAl陰極を用いたものと比較して示す図。
【図4】 本発明により製造されたプラズマディスプレイパネル用陰極の寿命特性を示す。
【符号の説明】
11 下地電極等を形成
12 BaO2 塗布
13 陽極・ 隔壁・ 蛍光体形成
14 フリット塗布・ 組立
15 封着・ 排気
16 ガス導入・ チップオフ
17 大電流で放電
18 エージング
21 陰極
22 下地電極
23 陽極
24 蛍光体
25 隔壁
26 前面板
27 背面板
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a cathode used for a plasma display panel, and more particularly to a method of manufacturing a cathode having a long life and a stable discharge at a low voltage.
[0002]
[Prior art]
There are two types of plasma display panels, DC type and AC type, and the cathode uses Al for the DC type and MgO for the AC type.
In addition, there are LaCaCrO 3 , LaSrCoO 3 , LaSrMnO 3 and the like as cathode materials that can be discharged at a low voltage.
Further, in a pilot lamp or the like, BaO obtained by thermally decomposing BaCO 3 is used.
There is also a report that metal Ba obtained by thermally decomposing Ba (N 3 ) 2 is used as a cathode .
[0003]
[Problems to be solved by the invention]
In the conventional cathode, sufficient characteristics as a cathode for a plasma display panel have not been obtained. That is, the discharge voltage is high, the discharge is not stable, the life is short, and the introduction into the panel is difficult.
For example, Al has achieved a long life with a structure with high gas pressure and resistance, but has a high discharge voltage.
LaSrCoO 3 has a low voltage, but does not discharge stably due to concentration of discharge and has a short life.
In order to obtain BaO from BaCO 3, it must be thermally decomposed at a very high temperature, and it is difficult to introduce it into a plasma display panel.
When metal Ba obtained by thermally decomposing Ba (N 3 ) 2 is used as a cathode, it discharges at a low voltage, but there is a problem in terms of life.
Accordingly, an object of the present invention is to provide a cathode for a plasma display panel that can be easily introduced into a plasma display panel and has excellent characteristics as a cathode of the panel, that is, a low discharge voltage, a stable discharge and a long life . It is intended to provide a manufacturing method .
[0004]
[Means for Solving the Problems]
To this end, the production method of the present invention a plasma display panel for cathode, the method comprising the following steps namely: at least one of BaO 2 or SrO 2, or at least one CaO 2 or of BaO 2 or SrO 2 Forming a combination with at least one of the rare earth oxides on the surface of the underlying metal; heating it in a vacuum; and then active in a noble gas at a current greater than the normal operating current after completion of the panel And a procedure of forming by discharging for the purpose of crystallization.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a flow chart of an example of a manufacturing procedure of a panel according to a cathode display panel manufacturing method of the present invention, and FIG. 2 shows a cross-sectional view of one cell constituting a DC type plasma display panel manufactured by the above procedure.
An embodiment of panel manufacturing according to the present invention will be described below with reference to the block diagram shown in FIG. 2 according to the procedure shown in FIG.
[0006]
Form base electrodes on the front plate (11)
Other than the cathode such as the base electrode 22 is formed on the front plate 26 by thick film printing, vacuum deposition, photolithography or the like. The base electrode is an Al or Ni electrode deposited or thick-film printed.
BaO 2 on the base electrode Application (12)
Next, a paste whose viscosity is adjusted with BaO 2 in a powder form having a particle size of several μm or less and screen oil so as to cover the electrode is thickly printed on the base electrode 22.
Formation of anode, partition, and phosphor on back plate (13)
On the back plate 27, an anode 23, a partition wall 25, a phosphor 24 and the like are formed in advance.
[0007]
Frit application and assembly (14)
The front plate and the back plate are assembled using a crystallization type frit made of low-melting glass.
Sealing / Exhaust (15)
Next, sealing and exhausting are performed simultaneously. It is heated to a sealing temperature in an electric furnace connected to a vacuum apparatus, and after crystallization of the frit is completed, evacuation is performed while maintaining the temperature. The exhaust time at this time is about 1 hour. By heating in vacuum, BaO 2 is decomposed into BaO and O 2 , and O 2 is exhausted to remain BaO.
Gas introduction and chip-off (16)
Thereafter, after the temperature is lowered to room temperature, 200 Torr of He gas mixed with 10% of Xe is sealed and the chip is turned off.
[0008]
Discharge with large current (17)
Next, discharging is performed with a current larger than that normally used for activating the cathode. In the experiment, usually with respect to the current to be used 0.13 to a 0.21 / cm 2, it was discharged at about 1.7A / cm 2 at namely 13 times the current 8 times. Discharge several times for several seconds.
Aging (18)
Finally, aging is performed with the discharge current normally used until the voltage stabilizes.
[0009]
As shown in FIG. 3, the plasma display panel thus obtained is found to discharge at a voltage lower by about 150 V when compared with a conventionally used Al cathode 31 under the same conditions. It was.
Moreover, when only one cell was discharged and the discharge characteristic was seen, it turned out that it was discharging stably, even if it discharged for 1000 minutes or more, as shown in FIG.
Here, an example has been shown in which BaO 2 powder is formed by thick film printing on an Al electrode previously formed by film thickness printing, but the same effect can be obtained by mixing SrO 2 or BaO 2 and SrO 2. . Furthermore, even if CaO 2 or rare earth oxide is mixed, the same effect can be obtained.
Further, instead of applying the powder, BaO 2 , SrO 2 or the like may be formed by vapor deposition.
Furthermore, although the example of He—Xe (10%) 200 Torr is shown as the sealing gas, other rare gas or a mixed gas with other rare gas may be used.
[0010]
Although the embodiments of the present invention have been described above with respect to several examples, the present invention is not limited to these examples, and various modifications may be made within the scope of the invention defined in the claims. It will be apparent to those skilled in the art that changes are possible.
[0011]
【The invention's effect】
By using the method for manufacturing a cathode for a plasma display panel according to the present invention, a plasma display panel that can be driven at a low voltage and has a long life can be manufactured.
[Brief description of the drawings]
FIG. 1 shows a flowchart of an example of a panel manufacturing procedure according to a method for manufacturing a cathode for a plasma display panel according to the present invention.
FIG. 2 is a cross-sectional view of one cell constituting a DC type plasma display panel manufactured according to the procedure of the present invention.
FIG. 3 is a diagram showing the discharge characteristics of a plasma display panel manufactured according to the present invention in comparison with that using a conventional Al cathode.
FIG. 4 shows life characteristics of a cathode for a plasma display panel manufactured according to the present invention.
[Explanation of symbols]
11 Form base electrode 12 BaO 2 coating 13 Anode / partition / phosphor formation 14 Frit coating / assembly 15 Sealing / exhaust 16 Gas introduction / chip-off 17 Discharge with large current 18 Aging 21 Cathode 22 Base electrode 23 Anode 24 Fluorescence Body 25 Bulkhead 26 Front plate 27 Rear plate

Claims (3)

プラズマディスプレイパネル用陰極の製造方法において、当該方法が以下の手順すなわち:BaO もしくはSrOの少なくとも1つ、またはBaO もしくはSrOの少なくとも1つとCaO もしくは希土類酸化物の少なくとも1つとの組み合わせを下地金属表面に形成する手順と;これを真空中で加熱する手順と;そののち希ガス中で前記パネル完成後の通常の動作電流よりも大きい電流で活性化の目的で放電させて形成する手順とを含むことを特徴とするプラズマディスプレイパネル用陰極の製造方法。The method of manufacturing a plasma display panel for a cathode, the method comprising the following steps namely: at least one of a combination of BaO 2 or at least one of SrO 2, or at least one CaO 2 or rare earth oxides BaO 2 or SrO 2 Forming on the surface of the base metal; heating it in a vacuum; and then discharging in a rare gas for the purpose of activation at a current larger than the normal operating current after completion of the panel A method for producing a cathode for a plasma display panel. 請求項1記載の陰極の製造方法において、前記下地金属表面への形成する手順が、BaO もしくはSrOの粉体、またはBaO もしくはSrOの粉体とCaO もしくは希土類酸化物の粉体を含む印刷ペーストを用い、厚膜印刷法でなされることを特徴とするプラズマディスプレイパネル用陰極の製造方法 2. The method of manufacturing a cathode according to claim 1 , wherein the step of forming on the surface of the base metal comprises BaO 2 or SrO 2 powder, or BaO 2 or SrO 2 powder and CaO 2 or rare earth oxide powder. A method for producing a cathode for a plasma display panel, characterized in that the printing paste is used and a thick film printing method is used. 請求項1記載の陰極の製造方法において、前記下地金属表面への形成する手順が真空蒸着法でなされることを特徴とするプラズマディスプレイパネル用陰極の製造方法 2. The method of manufacturing a cathode for a plasma display panel according to claim 1 , wherein the step of forming on the surface of the base metal is performed by a vacuum deposition method .
JP21307199A 1999-07-28 1999-07-28 Method for producing cathode for plasma display panel Expired - Fee Related JP3703999B2 (en)

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Application Number Priority Date Filing Date Title
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JP21307199A JP3703999B2 (en) 1999-07-28 1999-07-28 Method for producing cathode for plasma display panel

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JP3703999B2 true JP3703999B2 (en) 2005-10-05

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