JPH03205739A - Gas discharge display panel - Google Patents

Abstract

PURPOSE:To prevent the inter-cathode insulation failure with a simple structure and obtain a gas discharge display panel with stable characteristics by covering at least part of the surface of spacers forming a discharge cell with a dielectric substance containing lead oxide. CONSTITUTION:A dielectric substance layer 75 containing lead oxide similar to the dielectric substance layer 50 of a substrate 10 is formed on the surface containing the inner faces of holes of soda glass spacers 71, 72 kept in contact with the dielectric substance layer 50 of the substrate 10. When the spacers 71, 72 formed with the dielectric substance layer 75 containing lead oxide on the surface are used, the portion of a cathode 60 stuck with a spatter material is wholly made of a lead glass dielectric substance, no movement of Na ions occurs, no metal lead is deposited, and the occurrence of a current leak due to the insulation failure between adjacent cathodes is prevented. The occurrence of an unlighted cell and the rise of the driving voltage are prevented, and a gas discharge display panel with the stable operation for a long period is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is constituted by a discharge display element that utilizes visible light or ultraviolet light generated by gas discharge. This invention relates to a gas discharge display panel for displaying characters and images.

[Conventional technology]

The conventional structure of a gas discharge display panel in which discharge cells are formed using glass spacers is disclosed, for example, in Japanese Patent Application Laid-Open No. 60-101.
It is described in Publication No. 594.

FIG. 4 is a diagram showing a cross section of a discharge cell of the gas discharge display panel shown in the above-mentioned known example. In the figure, 10 is an insulating substrate, and on this substrate 10, a cathode lead 20, a cathode resistor 30, and a cathode base electrode 40 are formed by a thick film printing method, and a dielectric layer 50 for insulation is further formed on this substrate. It is being A normal thick film paste is used for the dielectric layer 50,
It is made of glass whose main component is lead glass. For example, a barium cathode 60 is provided on the cathode base electrode 40. 70.71 is a spacer that forms a discharge cell, and 0.71 is a spacer that forms a discharge cell.
A discharge cell is formed by laminating thin soda glass plates of about 2 mm in thickness with holes drilled through chemical etching.

An auxiliary anode 80 is formed on one of the spacers 70 and is arranged to intersect with the cathode lead 20 to form a matrix. The spacer 7l is in close contact with the dielectric layer 50 on the substrate 10 and separates adjacent cathodes.

90 is a translucent face plate made of soda glass or the like, on which an anode lOO is formed.

[Problem to be solved by the invention]

The operating time of the gas discharge display panel with the above conventional structure is 300.
After 0 hours, spattered material from the cathode due to discharge thickly adheres to the area around the cathode and to the spacers forming the discharge cells, and becomes conductive. This causes problems such as poor insulation between adjacent cathodes, current leakage between the cathodes, and malfunctions such as unlit cells and increased drive voltage.

The reason for this is that the substrate dielectric layer 50 is made of lead glass, and the spacer 71 in close contact with it is made of soda glass. The volume resistivity of soda glass is more than four orders of magnitude lower than that of lead glass, and when sputtered material adheres to the spacer and becomes conductive, the N in the soda glass is destroyed by the electric field.
A ions move, but lead ions hardly move. Therefore, the Na ions combine with oxygen in the oxidizing vessel at the interface between the spacer 71 and the dielectric layer 50, and lead metal is precipitated at the interface. This metallic lead causes insulation failure between adjacent cathodes.

An object of the present invention is to eliminate this poor insulation between cathodes with a simple structure.

[Means to solve the problem]

In order to achieve the above object, the present invention forms a dielectric layer containing lead oxide similar to the dielectric layer of the substrate on the surface including the inner surface of the hole of the soda glass spacer in contact with the dielectric layer on the substrate. It is something.

[Effect]

Even if cathode spatter material adheres around the cathode and becomes conductive after long-term operation, if the spatter material does not adhere to both sides of the soda glass and lead glass, metallic lead will not precipitate and the adjacent No insulation deterioration occurs between the cathodes. Therefore, if the spacer according to the present invention is formed with a dielectric layer containing lead oxide on the surface, the part to which the spatter material of the cathode is attached is entirely a lead glass dielectric, so there is no movement of Na ions, and the metal Since lead does not precipitate, current leakage due to poor insulation between adjacent cathodes is eliminated.

This eliminates the occurrence of unlit cells, increases in drive voltage, etc., and enables replacement of gas discharge display panels that operate stably for long periods of time.

〔Example〕

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

FIG. 1 is a sectional view showing a discharge cell structure of a gas discharge display panel according to the present invention.

In the figure, 10 is an insulating substrate made of forsterite or soda glass, on which a cathode lead 20, a resistor 30, and a cathode base electrode 40 made of Ni are formed by a thick film printing method or the like.
Further, the entire surface except for the cathode base electrode 40 is covered with an insulating dielectric layer 50. For the dielectric layer 50, glass paste containing lead oxide is used in most cases. 60 is a cathode, for example, by printing barium azide and thermally decomposing it in vacuum, a barium cathode can be obtained. 70, 71, 72 are spacers for forming discharge cells, each having a thickness of 0.2 mm.
It is used by laminating thin sheets of soda glass with holes drilled through chemical etching.

A dielectric layer 75 containing lead oxide according to the invention is applied to the surface of the spacer 71 , 72 around the cathode 60 . The dielectric layer 75 is formed by, for example, a spraying method, a thick film printing method, or dipping. The paste used in the thick film printing method is a commercially available product, and most dielectric pastes with a firing temperature of 600° C. or less can be used.

The cross section of the auxiliary discharge space 110 is, for example, width 0.3wn and height 0.
．． 2+nm, and an auxiliary anode 80 is provided at one end thereof to perform an auxiliary discharge between it and the cathode 60. The auxiliary anode 80 is formed by printing, for example, Ni paste on one spacer 700 and baking it. The auxiliary anode 80 is arranged to intersect with the cathode lead 20 to form a matrix. 90 is a translucent face plate made of soda glass or the like, and an anode 100 is provided thereon.

Reference numeral 120 denotes a display discharge space, which has a cross section of 0.8 mm square and a length of 0.5 to 3 m in the direction perpendicular to the translucent face plate 90, for example, in the case of a cell pitch of 1 field. The wall surface of the display discharge space is coated with a phosphor, and the ultraviolet rays generated by the display discharge between the anode 100 and the cathode 60 are used to display light.

The gas discharge display panel configured as described above further includes Xe, Ar, Ne, and He in each discharge cell, which is airtightly isolated from the outside world.
, Kr, and other rare gases are filled in one kind or a mixture of two or more kinds, and then the mixture is completely filled.

In the panel with this configuration, even if the cathode 60 is sputtered due to discharge, the sputtered material is attached to the dielectric layer 60.
and a dielectric layer 75 on the surface of the spacer, and since both are made of the same lead glass type material, no insulation failure occurs between adjacent cathodes even if the cathodes are operated for a long time.

FIG. 2 is a partial sectional view showing another embodiment of the present invention. The figure shows the area around the cathode 60, and the dielectric layer 75 is formed only on the surface of the spacer 71 that is in contact with the substrate dielectric layer 50. Most of the spatter of the cathode 60 is attached near the cathode, and even if this structure is used, the same effect as described above can be obtained.

FIG. 3 is a partially sectional perspective view showing the entire gas discharge display panel described in FIG. 1. FIG. A dielectric layer (not shown) according to the present invention is formed on the spacer 7l, and phosphors that emit light in red, green, and blue are separately painted in each cell so that a color television image can be displayed.

〔Effect of the invention〕

As described above, according to the present invention, insulation defects that occur between adjacent cathodes can be prevented by an extremely simple method of forming a dielectric layer containing lead oxide on the surface of the spacer, so even after long-term operation. Problems such as the occurrence of unlit cells and increases in driving voltage are eliminated, making it possible to significantly improve lifespan and reliability, and allowing gas discharge display panels with stable characteristics to be replaced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a discharge cell in a gas discharge display panel according to an embodiment of the present invention, FIG. 2 is a partial sectional view of a gas discharge display panel according to another embodiment, and FIG. FIG. 4 is a partial cross-sectional perspective view of a discharge display panel. FIG. 4 is a cross-sectional view showing a discharge cell of a conventional gas discharge display panel. 10... Insulating substrate, 20... Cathode lead, 50...
・Dielectric layer. 60... cathode, 70, 71, 72...
Spacer, 75... Dielectric layer, 80... Auxiliary anode, 90... Light shielding face plate, 100... Anode, 1 10... Auxiliary discharge space, 7l/I7θ pottery (2) lθ Special grade 2θ Yinnemen sword 5θ word yt 1st, 5θ poetry operation number 5 θ poetry book A 7l entering ゜-1 / θt fall'sha

Claims (1)

[Claims] 1. A gas having a spacer made of soda glass forming a discharge cell provided between two insulating plates, a translucent face plate and an insulating substrate, and having at least one type of cathode group and at least one type of anode group. A gas discharge display panel characterized in that at least a portion of the surface of the spacer forming the discharge cell is covered with a dielectric material containing lead oxide.