# US 4,393,326 A · DC Plasma display panel

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- Number: US 4,393,326 A
- Document ID: US4393326A
- Status: Granted
- Kind: A
- Application number: 06/236,379
- Filed: 1981-02-20
- Granted: 1983-07-12
- Earliest claimed: 1980-02-22
- Assignees: Okaya Electric Industries Co., Ltd.
- Inventors: Takeo Kamegaya; Satoshi Watanabe
- Web page: https://patentgrep.com/patent/US4393326A

## CPC

- H01J 17/49: Display panels, e.g. with crossed electrodes {, e.g. making use of direct current (display panels making use of alternating current H01J11/00)}
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

A plasma display panel with an electrode composed of a metal layer (e.g., Fe and Ni) and a metal compound layer (e.g., alkaline earth metal oxide or sulfide, and rare earth metal hexaborides) which are formed by means of plasma spray coating. The plasma spray coating should be done at such a temperature that the metal or metal compound is in the molten state.

## Claims

### Claim 1

A DC plasma display panel comprising first and second substrates defining a gas chamber therebetween; an ionizable gaseous medium within said chamber; an anode layer formed onto said first substrate; a cathode layer formed onto said second substrate; an emitter layer formed onto said cathode layer; said cathode layer, said emitter layer, and said anode layer being disposed within said chamber for ionizing said gaseous medium; said emitter layer being formed onto said cathode layer by plasma spray coating.

### Claim 2 (depends on 11)

The plasma display panel of claim 11 wherein said cathode layer is made from a metal selected from the group consisting of Fe, Ni, W, Cu, Cr and Al.

### Claim 3 (depends on 11)

The plasma display panel of claim 11 wherein said cathode layer is made from a metal alloy.

### Claim 4 (depends on 1, 2, 3)

The plasma display panel of any of claims 1, 2 or 3 wherein said cathode layer is formed by plasma spray coating.

### Claim 5 (depends on 1, 2, 3)

The plasma display panel of any of claims 1, 2 or 3 wherein said emitter is made from a compound selected from the group consisting of alkaline earth metal oxides, alkaline earth metal sulfides, aluminum composite metal oxides, and rare earth metal hexaborides.

### Claim 6 (depends on 1, 2, 3)

The plasma display panel of any of claims 1, 2 or 3 wherein said emitter has a thickness in the range of 1 to 50.mu..

### Claim 7 (depends on 5)

The plasma display panel of claim 5 wherein said plasma spray coating is performed at a temperature sufficiently high to melt the material of said emitter.

### Claim 8 (depends on 1)

The DC plasma display panel of claim 1, wherein said emitter layer comprises a plurality of discrete emitters and said anode layer comprises a plurality of discrete anodes, said emitters and said anodes defining a plurality of gas discharge cells therebetween.

### Claim 9 (depends on 1)

The DC plasma display panel of claim 1, wherein said cathode layer is in the form of at least one strip.

### Claim 10 (depends on 9)

The DC plasma display panel of claim 9, wherein said emitters are formed as a plurality of disc-shaped regions onto said cathode layer.

### Claim 11 (depends on 10)

The DC plasma display panel of claim 10, wherein said cathode layer has a plurality of substantially circular apertures formed therein and wherein said emitters are provided within said apertures.