JPH027136B2 - - Google Patents
Info
- Publication number
- JPH027136B2 JPH027136B2 JP55021789A JP2178980A JPH027136B2 JP H027136 B2 JPH027136 B2 JP H027136B2 JP 55021789 A JP55021789 A JP 55021789A JP 2178980 A JP2178980 A JP 2178980A JP H027136 B2 JPH027136 B2 JP H027136B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- alkaline earth
- earth metal
- oxide
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Gas-Filled Discharge Tubes (AREA)
Description
【発明の詳細な説明】
本発明は、直流型ガス放電表示パネル（以下
「DC型PDP」（プラズマ・デイスプレー・パネ
ル）という。）の陰極構造及びその製法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode structure of a direct current type gas discharge display panel (hereinafter referred to as "DC type PDP" (plasma display panel)) and a manufacturing method thereof.
従来のDC型PDPの陰極は、形状がワイヤ状や
帯状などの場合は、Fe、Niの合金もしくはFe、
Ni、Crの合金板をエツチングして作り、印刷カ
ソードとする場合は、Ni粉末をペースト状にし
て陰極の基体金属に印刷し、燃焼させて作るのが
普通であつた。 When the cathode of a conventional DC type PDP is wire-shaped or strip-shaped, it is made of an alloy of Fe, Ni, or an alloy of Fe, Ni,
When making a printed cathode by etching a Ni and Cr alloy plate, it was common to make a paste of Ni powder, print it on the base metal of the cathode, and then burn it.
しかし、これら従来のものは、陰極材質がFe、
Ni、Crなどで仕事関数が4.5eV近傍であるため、
DC型PDPの動作電圧が300V程度必要であつた。
この300Vに達する動作電圧は、DC型PDPの消費
電力を大きくすると共にLSIの直接駆動を難しく
していた。この対策として仕事関数の低い物質を
陰極の材料に用いることが考えられるが、これら
の物質のDC型PDPへの使用は、電気的絶縁物で
あるとか融点が高いとかの理由によつてその実現
がなかなか困難であつた。 However, in these conventional products, the cathode material is Fe,
Since the work function of Ni, Cr, etc. is around 4.5eV,
DC-type PDPs required an operating voltage of about 300V.
This operating voltage of 300V increases the power consumption of DC-type PDPs and makes it difficult to directly drive LSIs. As a countermeasure to this problem, it is possible to use materials with a low work function as materials for the cathode, but the use of these materials in DC-type PDPs has been difficult due to reasons such as being electrical insulators or having high melting points. It was quite difficult.
例えば、アルカリ土類金属元素の酸化物、硫化
物又はアルミニウムとの複合金属酸化物は、下記
のような特徴をもつている。 For example, oxides, sulfides, or composite metal oxides of alkaline earth metal elements with aluminum have the following characteristics.
(イ) 仕事関数が低い。（例、BaO……1.9eV、
BaS……2.1eV、MgO・Al2O3……2.3eV）
(ロ) 融点が高い。（例、BaO……1923℃、BaS…
…2000℃、MgO・Al2O3……2135℃）
(ハ) 電気的絶縁性を有する。(b) It has a low work function. (Example, BaO...1.9eV,
BaS...2.1eV, MgO・Al 2 O 3 ...2.3eV) (b) High melting point. (Example, BaO...1923℃, BaS...
...2000℃, MgO・Al 2 O 3 ...2135℃) (c) Has electrical insulation properties.
したがつて、これらの物質をDC型PDPの陰極
に使用する場合、電気的絶縁物であるため放電電
流を持続的に取り出すことができないので、その
電気的絶縁物の層内にアルカリ土類金属元素の遊
離物を作らなければならない。したがつて、アル
カリ土類金属元素の酸化物などを陰極に使用する
ためには、その製造工程の中に高温による溶融及
び活性化による遊離金属の発生を促す工程が必要
となる。例えば、ネオン・パイロツト・ランプの
製造工程においては、炭酸バリウム（BaCO3）
を電極基体金属に付着させ、これを真空中で高周
波加熱により溶融分解し、アーク放電による活性
化を行なつて遊離バリウムを作つている。ところ
が、平坦な構造に形成されたDC型PDPでは、高
周波加熱によるエミツタ物質の溶融分解を行なう
と構造が変形してしまうなどの問題があつて、か
ような方法を適用することができない。 Therefore, when these materials are used for the cathode of a DC-type PDP, since they are electrical insulators, it is not possible to extract a discharge current continuously. Free products of the elements must be made. Therefore, in order to use an oxide of an alkaline earth metal element for a cathode, a step is required in the manufacturing process to promote the generation of free metals through melting and activation at high temperatures. For example, in the manufacturing process of neon pilot lamps, barium carbonate (BaCO 3 ) is
Free barium is produced by attaching barium to the electrode base metal, melting and decomposing it by high-frequency heating in a vacuum, and activating it by arc discharge. However, such a method cannot be applied to DC-type PDPs formed in a flat structure because of problems such as deformation of the structure when the emitter material is melted and decomposed by high-frequency heating.
そこで、本発明においては、上記のアルカリ土
類金属元素の酸化物又は硫化物又はアルミニウム
との複合金属酸化物を、例えば、希ガスなどの不
活性ガスを流通したプラズマ・ジエツト装置を用
いるプラズマ溶射により、陰極基体金属表面に吹
き付け溶融した状態で付着させることによつて、
上述の問題点を解決した。 Therefore, in the present invention, the above-mentioned oxides or sulfides of alkaline earth metal elements or composite metal oxides with aluminum are sprayed by plasma spraying using a plasma jet device in which an inert gas such as a rare gas is circulated. By spraying and adhering it to the cathode base metal surface in a molten state,
The above problems have been solved.
プラズマ溶射では、プラズマ内の温度が数千な
いし数万度に達し、融点の高い上記化合物を容易
に溶かすことができる。しかも、その際、アルカ
リ土類金属元素を遊離させることができる。第１
図は、この方法で付着させた陰極基体金属表面の
上記化合物の構造を示す拡大断面図である。図に
おいて、１は陰極の基体金属、２は溶着した上記
のアルカリ土類金属化合物、３は遊離したアルカ
リ土類金属元素を示す。基体金属１は任意の金属
でよく、その表面に上記化合物２が折り重なるよ
うに溶着して多孔質の層を形成している。そし
て、遊離したアルカリ土類金属元素３がその間に
点在している。ゆえに、上記化合物２が電気的絶
縁性であつても、接続して電流を取り出すことが
できる。なお、更に、上記化合物２の多孔質層の
内部に仕事関数の小さい金属（導電体）を適当な
方法で含浸させてもよい。 In plasma spraying, the temperature within the plasma reaches several thousand to tens of thousands of degrees, and the above-mentioned compounds with high melting points can be easily melted. Moreover, at this time, alkaline earth metal elements can be liberated. 1st
The figure is an enlarged sectional view showing the structure of the above compound on the surface of the cathode base metal deposited by this method. In the figure, 1 indicates the base metal of the cathode, 2 indicates the above-mentioned welded alkaline earth metal compound, and 3 indicates the liberated alkaline earth metal element. The base metal 1 may be any metal, and the compound 2 is welded to its surface in a folded manner to form a porous layer. And the liberated alkaline earth metal elements 3 are scattered therebetween. Therefore, even if the compound 2 is electrically insulating, it can be connected to extract current. Furthermore, a metal (conductor) having a small work function may be impregnated into the inside of the porous layer of Compound 2 by an appropriate method.
このような構造の陰極をDC型PDPに使用する
と、管内ガスのイオンが仕事関数の低い上記化合
物２に衝突して電子を放出させ、100V程度の低
い電圧で安定に動作させることができる。ただ
し、この化合物２の層の厚さは、あまり薄いとイ
オン衝撃による摩耗が激しく寿命が短くなり、あ
まり厚いと薄い基体金属に付着させる関係上放電
表示パネルの放電セルのピツチを小さくできない
から、実用上0.05μ〜50μの範囲が適当である。 When a cathode with such a structure is used in a DC-type PDP, ions in the tube gas collide with the compound 2, which has a low work function, and emit electrons, allowing stable operation at a voltage as low as about 100V. However, if the layer of compound 2 is too thin, wear due to ion bombardment will be severe and the lifespan will be shortened, and if it is too thick, the pitch of the discharge cells of the discharge display panel cannot be reduced because it will adhere to a thin base metal. Practically speaking, a range of 0.05μ to 50μ is appropriate.
本発明は、平坦な構造をもつDC型PDPなら
ば、どんな種類のものにも適用できる。例えば、
マトリツクス状に電極を配置したキヤラクタ・デ
イスプレーや短冊状電極を並行に配置したバーグ
ラフ・デイスプレーなどの製造工程において、均
一な陰極面をパネル状の放電管に無理なく組み込
むことができる。第２図は、本発明によるDC型
PDPの陰極形状の一例を示す斜視図で、２′は第
１図の２より成る多孔質の付着層を示す。なお、
アルカリ土類金属元素の酸化物又は硫化物又はア
ルミニウムとの複合金属酸化物を基体金属上にプ
ラズマ溶射により付着させる際、Mg単体あるい
はMgCO3などは酸化あるいは分解によつてそれ
ぞれMgOとなるので、これらを本発明に使用す
ることもできる。このようにプラズマ溶射の結果
としてアルカリ土類金属元素の酸化物又は硫化物
又はアルミニウムとの複合金属酸化物となる場合
も、本発明に含まれるものである。また、溶射方
法としてプラズマ溶射についてのみ述べたが、こ
れに限らずこれと同効の方法を使用することもで
きる。 The present invention can be applied to any type of DC-type PDP with a flat structure. for example,
In the manufacturing process of character displays in which electrodes are arranged in a matrix or bargraph displays in which strip-shaped electrodes are arranged in parallel, a uniform cathode surface can be easily incorporated into a panel-shaped discharge tube. Figure 2 shows the DC type according to the present invention.
2 is a perspective view showing an example of the shape of a cathode of a PDP, and 2' indicates a porous adhesion layer consisting of 2 in FIG. 1. In addition,
When oxides or sulfides of alkaline earth metal elements or composite metal oxides with aluminum are deposited on a base metal by plasma spraying, Mg alone or MgCO 3 becomes MgO through oxidation or decomposition, respectively. These can also be used in the present invention. In this way, the present invention also includes cases where an oxide or sulfide of an alkaline earth metal element or a composite metal oxide with aluminum is formed as a result of plasma spraying. Further, although only plasma spraying has been described as a thermal spraying method, the present invention is not limited to this, and other methods having the same effect can also be used.
以上説明したとおり、本発明によれば、仕事関
係が低いけれども融点が高く電気的絶縁性を有す
るアルカリ土類金属元素の酸化物又は硫化物又は
アルミニウムとの複合金属酸化物を、例えばプラ
ズマ溶射によつてDC型PDPの陰極基体金属上に
多孔質の付着層として形成することにより、特に
高温加熱処理をすることなく、従来のものに比し
動作電圧が低く消費電力の小さいDC型PDPを容
易に作ることができ、したがつて、LSIの直接駆
動を可能とするなど多くの利点が得られる。特に
本発明では陰極基体金属を形成するためのベース
となる絶縁基体として一般的なガラス基板を用い
た場合でもガラス基板に熱的変形を起させること
がない。即ち、プラズマ溶射では融点の高いアル
カリ土類金属元素の酸化物又は硫化物又はアルミ
ニウムとの複合金属酸化物を容易に溶すことがで
き、これが基体金属上に付着すると直ちに冷却さ
れ、この上に次の溶融された上記化合物が付着し
て直ちに冷却されることの繰返しで付着層が形成
される。従つて、ガラス基板を熱変形させること
がなく、即ち所謂DC型PDPの構造を変形させる
ことがない。 As explained above, according to the present invention, an oxide or sulfide of an alkaline earth metal element having a low work relationship but a high melting point and electrically insulating properties or a composite metal oxide with aluminum can be used, for example, by plasma spraying. Therefore, by forming a porous adhesion layer on the cathode base metal of a DC-type PDP, it is possible to easily create a DC-type PDP with lower operating voltage and lower power consumption than conventional ones without any special high-temperature heat treatment. Therefore, many advantages can be obtained, such as the ability to directly drive LSIs. In particular, in the present invention, even when a general glass substrate is used as an insulating substrate serving as a base for forming the cathode base metal, the glass substrate is not thermally deformed. In other words, plasma spraying can easily melt oxides or sulfides of alkaline earth metal elements with high melting points, or composite metal oxides with aluminum, and when this is deposited on the base metal, it is immediately cooled and then An adhesion layer is formed by repeating the following process in which the molten compound is deposited and immediately cooled. Therefore, the glass substrate is not thermally deformed, that is, the structure of the so-called DC type PDP is not deformed.
第１図は、本発明による陰極の表面の構造を示
す拡大断面図、第２図は、本発明によるDC型
PDPの陰極形状の一例を示す斜視図である。
１……陰極の基体金属、２……付着したアルカ
リ土類金属元素の酸化物又は硫化物又はアルミニ
ウムとの複合金属酸化物、２′……２より成る多
孔質の付着層、３……遊離したアルカリ土類金属
元素。
FIG. 1 is an enlarged sectional view showing the surface structure of the cathode according to the present invention, and FIG. 2 is a DC-type cathode according to the present invention.
FIG. 2 is a perspective view showing an example of a cathode shape of a PDP. 1...Base metal of the cathode, 2...Adhered oxide or sulfide of alkaline earth metal element or composite metal oxide with aluminum, 2'...Porous adhesion layer consisting of 2, 3...Free alkaline earth metal elements.
Claims (1)
酸化物又は硫化物又はアルミニウムとの複合金属
酸化物より成る多孔質の付着層が形成され、該多
孔質の孔内に少なくとも遊離したアルカリ土類金
属元素が点在していることを特徴とする直流型ガ
ス放電表示パネルの陰極。 ２ 陰極の基体金属上に、アルカリ土類金属元素
の酸化物又は硫化物又はアルミニウムとの複合金
属酸化物をプラズマ溶射により溶融した状態で付
着させて遊離したアルカリ土類金属元素が少なく
とも孔内に点在する多孔質の付着層を形成するこ
とを特徴とする直流型ガス放電表示パネルの陰極
の製法。[Scope of Claims] 1. A porous adhesive layer made of an oxide or sulfide of an alkaline earth metal element or a composite metal oxide with aluminum is formed on the base metal of the cathode, and in the porous pores. A cathode for a direct current gas discharge display panel, characterized in that at least free alkaline earth metal elements are scattered therein. 2. On the base metal of the cathode, an oxide or sulfide of an alkaline earth metal element or a composite metal oxide with aluminum is deposited in a molten state by plasma spraying, and the liberated alkaline earth metal element is deposited at least in the pores. A method for producing a cathode for a direct current type gas discharge display panel, which is characterized by forming a porous adhesive layer interspersed therewith.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178980A JPS56118238A (en) | 1980-02-22 | 1980-02-22 | Cathode for dc type gas discharge indication panel and manufacture |
| US06/236,379 US4393326A (en) | 1980-02-22 | 1981-02-20 | DC Plasma display panel |
| DE3106368A DE3106368C2 (en) | 1980-02-22 | 1981-02-20 | DC gas discharge indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2178980A JPS56118238A (en) | 1980-02-22 | 1980-02-22 | Cathode for dc type gas discharge indication panel and manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56118238A JPS56118238A (en) | 1981-09-17 |
| JPH027136B2 true JPH027136B2 (en) | 1990-02-15 |
Family
ID=12064823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2178980A Granted JPS56118238A (en) | 1980-02-22 | 1980-02-22 | Cathode for dc type gas discharge indication panel and manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56118238A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599828A (en) * | 1982-07-08 | 1984-01-19 | Okaya Denki Sangyo Kk | Heating cathode and production process thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54750B2 (en) * | 1973-11-15 | 1979-01-16 |
-
1980
- 1980-02-22 JP JP2178980A patent/JPS56118238A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56118238A (en) | 1981-09-17 |
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