JPH0744002B2 - Gas discharge display board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of a dielectric film of a gas discharge display plate, particularly an external electrode type gas discharge display plate.

[Conventional technology]

Conventionally, the dielectric film of this type of display panel has been constituted by a single type of glass film. Generally, a discharge resistant film such as magnesium oxide is provided on the surface of the dielectric film in order to reduce the discharge discharge pressure and prolong the life, but the dielectric film described here does not include these discharge resistant films. Make it not exist.

[Problems to be Solved by the Invention]

A transparent electrode is often formed as a display electrode on the display-side insulating plate of the display plate, and a nesa film containing tin oxide as a main component is used as a CV
Transparent electrodes formed by the D method are also frequently used. A glass paste prepared by kneading a low melting point lead glass with an organic binder is applied by a screen printing method so as to cover this type of NES film electrode,
It is fired to form a dielectric film.

In the above-described conventional dielectric film, the bubbles generated from the micropores of the Nesa film during firing remain in the molten lead glass film, and include many bubbles on the Nesa film. The film thickness of lead glass containing large bubbles becomes very thin, and when discharged and displayed,
The dielectric film in the bubble portion is liable to cause dielectric breakdown, and the dot-type display plate has a drawback in that the dot having the dielectric breakdown cannot perform discharge display.

[Means for Solving the Problems]

The gas discharge display plate of the present invention is configured such that two insulating plates having electrodes covered with a dielectric film are arranged so that their electrodes face each other through a space filled with a gas such as Ne. In the gas discharge display panel described above, the dielectric film is formed by laminating a plurality of low melting point glass films having different softening points.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. The display side insulating plate 1 is a substrate made of a transparent glass plate having a thickness of 2 mm,
A Nesa electrode 2 containing SnO ₂ as a main component is deposited on this substrate by a CVD method. A low melting point glass having a softening point sufficiently lower than the firing temperature is applied by a thick film printing method to cover the nesa electrode 2 and fired.
A first dielectric film 3 having a thickness of 6 μm is formed. Next, the softening point of the low melting point glass that constitutes the first dielectric film is 10
A second dielectric having a thickness of 6 μm is formed by applying a dielectric film made of a low melting point glass having a high softening point of ˜20 ° C. by a thick film printing method and firing the same as in the case of the first dielectric film. The film 4 is formed. A spacer 5 is applied by a thick film printing method so as to partition the display portion and baked to form a thickness of about 50 μm. Further, a magnesium compound is applied to the surface of the second dielectric film 4 to a thickness of about 2 μm to form the discharge resistant film 6.

On the other hand, the back side insulating plate 7 is a substrate made of a transparent glass plate having a thickness of 2 mm, and a conductive paste containing silver as a main component is thick-film printed and baked on the substrate to have a thickness of about 10 μm. The silver electrode 8 is formed. A third dielectric film 9 having a thickness of about 12 μm is formed by coating a dielectric film made of a low melting point glass having a softening point sufficiently lower than the baking temperature by a thick film printing method and baking the silver electrode 8 so as to cover the silver electrode 8. To do. A magnesium compound is applied to the surface of the third dielectric film 9 to a thickness of about 2 μm to form a discharge resistant film 10. After that, the display-side insulating plate 1 and the back-side insulating plate 7 are combined to hermetically seal the periphery with the seal glass 11, and 350 Torr of Ne gas is sealed inside through a separately provided exhaust hole (not shown) to discharge. I made a display board.

Since the softening point of the first dielectric film 3 in contact with the nesa electrode 2 is low, the display plate having such a structure has low viscosity during firing, and no bubbles remain in the dielectric film. However, since the viscosity is low and the Nesa electrode easily flows, the Nesa electrode is easily exposed in a land shape from the dielectric film. Second dielectric film 4
Is a film that compensates for this drawback, and is formed of a low melting point glass having a softening point higher than that of the first dielectric film 3, and covers the Nesa film exposed in a land shape with the first dielectric film. By laminating and forming the first dielectric film and the second dielectric film having different softening points in this way, it was possible to form a complete dielectric film without bubbles and without exposing the electrodes. .

FIG. 2 is a sectional view of Embodiment 2 of the present invention.

In Example 2, the dielectric film on the back surface side as well as the dielectric film on the display surface side were formed of two layers of low melting point glass having different softening points. That is, a dielectric film made of low melting point glass having a softening point sufficiently lower than the firing temperature is formed on the silver electrode 8 to form a fourth dielectric film 12 having a thickness of about 6 μm, and then the fourth dielectric film 12 is formed.
The fifth dielectric film 13 made of low melting point glass having a softening point of 10 to 20 ° C. higher than that of the low melting point glass constituting the dielectric film 12 of FIG.
And a thickness of about 6 μm. In this embodiment, there is an advantage that bubbles in the dielectric film generated by minute holes on the surface of the silver electrode can be prevented by the same principle as in the first embodiment.

The symbols 1 to 8, 10 and 11 in FIG. 2 are the same as the symbols in FIG.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the dielectric film covering the electrodes is formed by laminating a plurality of low-melting-point glass films having different softening points, so that the dielectric film has no bubbles and no electrode exposed portion. A high quality display panel can be obtained in which a film can be formed and dielectric breakdown of the dielectric film does not occur when discharge display is performed.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an embodiment 2
FIG. 1 ... Display-side insulating plate, 2 ... Nesa electrode, 3 ... First dielectric film, 4 ... Second dielectric film, 5 ... Spacer, 6,10
...... Discharge-resistant film, 7 ...... Back insulating plate, 8 ...... Silver electrode, 9
…… Third dielectric film, 11 …… Seal glass, 12 …… Fourth
Dielectric film, 13 ... Fifth dielectric film.

Claims (1)

[Claims] 1. A gas discharge display panel comprising two insulating plates having electrodes covered with a dielectric film, arranged so that their electrodes face each other through a space filled with a discharge gas. In the above, the dielectric film on the side covering at least the transparent electrode is a laminate of a plurality of low melting point glass films having different softening points, and the first low melting point glass film on the side in contact with the electrode is A low-melting point glass has a lower softening point than the low melting point glass.