JPS6316530A - Cathode for dc gas discharge display panel - Google Patents

Abstract

PURPOSE:To reduce starting discharge voltage and minimum discharge maintaining voltage and eliminate need on Hg by mixing Ni paste with MgO into the state of paste, and using printed and baked cathodes in a DC gas discharge display panel. CONSTITUTION:A DC gas discharge display panel comprises at least more than one cathodes 20 and more than one anodes 50. For cathodes 20, Ni paste including its main component Ni mixed with A1, B, Pb, etc., is mixed with MgO powder at the rate of 0.3wt% or more for MgO/Ni and formed in the state of paste and printed and baked. By using electrodes where MgO with a large secondary electron discharge coefficient and Ni and other conductors are exposed together in a gas discharge space 30 to act as cathodes for DC gas discharge, voltage can be lowered and sputtering reduced, achieving an increased life. In addition, Hg which has conventionally been used for preventing sputtering at the cathodes can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a direct current gas discharge type display panel for displaying characters, figures, etc., using a material with a large secondary electron emission coefficient for the cathode.

[Conventional technology]

The cathode of a conventional DC gas discharge type display panel has been made by printing and firing a Ni paste (for example, ESLφ2554, etc.), which is composed of Ni as a main ingredient and a mixture of At, B, Pb, and the like. FIG. 1 shows a cross-sectional view of a typical DC gas discharge type display panel (Japanese Patent Publication No. 53-25474). A plurality of parallel cathodes 20t-1Ni paste are printed and fired on the substrate 10.

On the other hand, on the back surface of the face plate 40, a plurality of mutually parallel anodes 50 are formed by printing and baking N1-pAu paste. The substrate 10 with electrodes formed thereon and the face plate 40 are stacked using a barrier (not shown) or the like so as to form a discharge space 30 (at this time, the cathode 20
and the anode 50 intersect), the surroundings are hermetically sealed, and after heating and exhausting in a high vacuum, Ne-A and Ne are mixed together with a small amount of Hg.
- Penning gas such as Xe, He-xe, or rare gas such as Xe is filled to complete the panel.

[Problem that the invention seeks to solve]

By the way, the Ni paste canode has a small secondary emission coefficient, and for example, the discharge starting voltage Vm and the minimum discharge sustaining voltage V when the panel as described above is filled with Xe gas.
M as shown in FIG.

Minimum voltage OV's -t: 390 V
, VM, l-: Very large at 260V, low power,
There is also a problem in terms of longevity.

The present invention reduces the discharge starting voltage and the maximum discharge sustaining voltage, and reduces the sputtering of the cathode by mixing MgO into a paste and using the printed and fired cathode in a DC gas discharge type display panel. The aim is to eliminate the need for Ig (used for prevention).

[Means for solving problems]

In the present invention, Ni powder is added to Ni paste mainly composed of Ni and mixed with At, B, Pb, etc. in a weight ratio of MgO/N.
It is a mixture with an i of 0.3 or more.

[Function] The present invention can eliminate the need for Hg, which has been used to prevent cathode sputtering. Therefore, the discharge start voltage and the minimum discharge sustaining voltage can be reduced, and a cathode with excellent characteristics can be provided.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

Figure 2 shows the panel structure shown in Figure 1 using Ni paste (for example ESL2554) as the cathode.
Xe gas pressure of discharge starting voltage V1 and minimum discharge sustaining voltage vM when using Ninu O powder mixed at a weight ratio of MgO/Ni paste (MgO/Ni paste) ~ 0.3, printed and fired in a paste form It shows P dependence (anode-cando gap = 0.1 m). The minimum values of VB and Vw in the case of the cathode MgO+Ni formed by mixing MgO with the Ni paste of the present invention are as compared to the conventional NI cathode.
About 70v at i.

With VM, we were able to significantly reduce the voltage to approximately 30V.

FIG. 3 shows the dependence of the minimum discharge starting voltage v3 on the weight ratio of M g O/N i when *X e is 50 Torr.

MgO/N i = O~0.3 +7), vIl
decreases rapidly and then shows saturation characteristics. therefore,
MgO/Ni should be >0.3. However, LN
Comparing the sputtering rates of i and MgO, the former is about 7 times higher than the latter, so it is better to have more O than Ni in order to reduce cathode sputtering. This eliminates the need for Hg, which was conventionally used to reduce Ni sputtering, and allows stable operation. Note that the amount of moO becomes extremely large, and N is deposited on the cathode surface.
When a conductor such as i is not exposed and the surface becomes an insulator and there is no continuity with the cathode terminal, positive charge accumulates on the cathode surface and weakens the electric field between the anode and cathode, causing the discharge to stop. Requires attention (i.e. goes into AC mode).

Further, even if the surface KMgO film of a conventional Ni paste fired cathode (conductor cathode) is formed into a porous shape with a thickness of several tens of microns or less, the effects of the present invention can be obtained. However, in this case, there are problems such as an increase in the number of process steps.

In addition to Xe, Penning gas such as N e -Ar can also be used to produce similar effects.

〔Effect of the invention〕

As explained above, the present invention lowers the voltage by operating an electrode in which a conductor such as MgO and Ni, which have a large secondary electron emission coefficient, coexist and are exposed in the gas discharge space 30 as a cathode for DC gas discharge. , long life can be achieved due to low sputtering.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional structural diagram of a conventional panel, Figures 2 and 3 are
The figure is a diagram showing the discharge characteristics of the present invention. DESCRIPTION OF SYMBOLS 10... Substrate, 20... Cathode, 30... Discharge space. 40... Face plate, 50... Anode. ￥-J 1 mouth ■ Z Figure × 4 Force/E6. F (Jorr) ■ 3 Figure 1 Quantity and H, P and θ/N

Claims (1)

[Claims] 1. In a DC gas discharge display panel composed of at least a plurality of cathodes and a plurality of anodes, the cathode is composed of a Ni paste composed mainly of Ni and a mixture of Al, B, Pb, etc., and MgO powder in a weight ratio. M
A cathode for a DC gas discharge type display panel, characterized in that it is made by mixing gO/Ni in a ratio of 0.3 or more to form a paste, which is then printed and fired.