JPH05283012A - Gas discharge type display panel - Google Patents

Abstract

PURPOSE:To lower discharge starting voltage and minimum discharge retaining voltage than these of a cathode, formed with La1-xSrxCoO3 and La1-xSrMnO3 etc., having perovskite type crystal structuer suggested so far needless to say Ni. CONSTITUTION:An oxide conductor, having perovskite type crystal structure expressed in a chemical formula (A11-xA2) (B11-yB2y)O3 (provided that A1, A2, B1, and B2 represent elements respectively, and X and Y show real numbers of 0-1. Also A1 and A2 give elements arranged in positions called an A site, and B1 and B2 show elements arranged in positions called a B site.), and including at least substances other than transition elements in (B11-yB2y) in the chemical formula above mentioned. Provided that, the transition elements mean all elements included in first-fourth transition elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharge type display panel for displaying characters and figures by utilizing gas discharge.

[0002]

2. Description of the Related Art The cathode of a conventional gas discharge type display panel is
The Ni paste is screen-printed on a glass substrate and baked in an air atmosphere. The cathode made of such Ni paste has a relatively high discharge start voltage and a minimum discharge sustaining voltage, It cannot be said that it is a cathode material.

In recent years, in order to solve this problem, a smaller value of 2.66 eV as compared with the work function of Ni of 5.24 eV.
A cathode using LaB ₆ with is has been developed. This type of technology is described in, for example, Technical Report I of the Television Society.
DP59-10 (1981) and the like.

However, LaB ₆ , which is originally a good conductor in bulk, has the feature that it easily forms a surface oxide layer, and when it is made into small particles of about several μm to form a paste for screen printing, its surface area is As a result, the area of the oxide layer increases, the electric conductivity in the macro sense significantly decreases after firing, and the inherent characteristics of LaB ₆ cannot be utilized.

In order to solve such a problem, an oxide conductor having a perovskite structure, such as La _1-x S, is used.
The applicant of the present invention has proposed a cathode using r _x CoO ₃ , La _{1 -x} Sr _x MnO _3, or the like. By using such an oxide conductor, it is possible to prevent deterioration of the conduction characteristics due to oxidation, and since the oxide conductor has a high secondary electron emission rate, the discharge start voltage and the minimum discharge sustaining voltage are lowered. It has the advantage of being able to

[0006]

However, such oxide conductors, such as La _1-x Sr _x CoO ₃ and La _1-x.
The cathode using Sr _x MnO ₃ or the like has a relatively high discharge start voltage and minimum discharge sustaining voltage as compared with a gas discharge type display panel including an alkali metal or an alkaline earth metal in the cathode, and thus has sufficient discharge characteristics. It cannot be said that there is a need for a cathode material that can further reduce the discharge voltage.

The present invention solves the above-mentioned conventional problems, and the discharge starting voltage and the minimum discharge maintaining voltage are L.
Disclosed is a gas discharge display panel having a cathode that is lower than a _1-x Sr _x CoO ₃ and La _1-x Sr _x MnO _{3 and} that can maintain good conductivity even when fired in an air atmosphere. The purpose is to

[0008]

In the present invention, in order to achieve the above object, symbols A1, A2, B1 and B2 respectively represent elements, X and Y represent real numbers of 0 to 1, and A
When 1, A2 represents an element coordinated to a position called A site, and B1 and B2 represent an element coordinated to a position called B site, the chemical formula (A1 _1-x A2
_x ) has a perovskite-type crystal structure represented by (B1 _1-y B2 _y ) O ₃ and has the formula (B1 _1-y B 2
2 _y ) is an oxide conductor containing at least a substance other than a transition element. Here, the transition element means all elements included in the first to fourth transition elements.

[0009]

Therefore, according to the present invention, as a cathode material
Since the oxide conductor of the above composition is used,
There is no increase in electrical resistance and the secondary electron emission efficiency is La_1-xS
r_xCoO₃, La_1-xSr_xMnO₃Higher than
Therefore, the discharge start voltage and the minimum discharge sustaining voltage are
La_1-xSr_xCoO₃, La_1-xSr_xMnO ₃etc
It has an effect that it can be lowered.

[0010]

【Example】

(Embodiment 1) Hereinafter, in the first embodiment of the present invention, La _0.1 Ba having a perovskite structure as a cathode material.
A case of producing a gas discharge type display panel using _0.9 PbO ₃ will be described. This substance is powder-bonded after firing, so a few μm can be placed in a mortar or ball mill.
Grind to m or less. This powder will be referred to as cobaltite powder. Next, by a generally known three-roller method, the cobaltite powder prepared by the above procedure,
The alkali glass powder and the organic solvent are adjusted to an appropriate viscosity, and the bonded particles are sufficiently loosened to prepare a paste.

Then, as shown in FIG. 1, a Ni paste is screen-printed on the rear glass substrate 1 as a cathode pattern and baked to form a Ni base electrode 2. A paste to be the cathode 3 of this embodiment is laminated on the Ni base electrode 2 by screen printing. After that, it is dried at 100 ° C and then at 550 to 660 ° C in an air atmosphere.
Bake for 0 minutes. The back glass substrate 1 on which the cathode 3 is formed in this manner, the anode 4 which is a transparent electrode, and the front glass substrate 6 on which the partition wall 5 is provided are superposed with the partition wall 5 interposed therebetween.
The surroundings are baked using a glass frit and sealed. Then, the discharge space 7 is evacuated to a high vacuum, and Ne-Ar, He is discharged.
A gas discharge display panel is prepared by introducing 10 to 500 torr of a gas such as -Xe.

In this way, the Ni base electrode 2 is formed.
La of the present embodiment_0.1Ba_0.9PbO₃With cathode
Regarding the discharge characteristics of the gas discharge type display panel,
La on the i cathode and Ni base electrode_0.5Sr_0.5Co
O₃A comparative experiment with that using a cathode was performed. Figure 2
Gas discharge display panel using the above three types of materials for the cathode
It shows the relationship between the gas pressure of the channel and the minimum discharge sustaining voltage.
It As is apparent from FIG. 2, La of this embodiment is_0.1Ba
_0.9PbO₃Not only Ni cathode but also La _0.5Sr
_0.5CoO₃You can see that the voltage is lower than that of the cathode
It

(Embodiment 2) Next, as a second embodiment of the present invention, a case where La _0.1 Ba _0.9 SnO ₃ is used as a cathode material will be described. Since the manufacturing method is the same as that of the first embodiment, duplicate description will be omitted. FIG. 3 shows the relationship between the gas pressure and the minimum discharge sustaining voltage when the La _0.1 Ba _0.9 SnO ₃ cathode of this example was used and when the La _0.5 Sr _0.5 CoO ₃ cathode was used as the conventional example. As is clear from FIG. 3, La _0.1 Ba in this example is
It can be seen that the _0.9 SnO ₃ cathode has a lower voltage than the La _0.5 Sr _0.5 CoO ₃ cathode.

[0014]

As described above, according to the present invention, since the oxide conductor containing the substance other than the transition element is used as the cathode material, there is no increase in the electric resistance due to the oxidation.
La _{1- x} Sr _x CoO ₃ , La having a perovskite type crystal structure, which has been proposed so far for the emission efficiency of secondary electrons
Since it is higher than _1-x Sr _x MnO ₃ etc., the discharge start voltage,
The minimum discharge sustaining voltage is lower than that of these oxide conductor cathodes as well as that of Ni cathodes, and a gas discharge type display panel with good display quality can be obtained.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a gas discharge display panel according to a first embodiment of the present invention.

FIG. 2 is a graph showing a relationship between a discharge sustaining voltage and a gas pressure when using respective cathode materials for comparing the first embodiment of the present invention with a conventional example.

FIG. 3 is a graph showing the relationship between discharge sustaining voltage and gas pressure when using respective cathode materials for comparing the second embodiment of the present invention with the conventional example.

[Explanation of symbols]

 1 Rear Glass Substrate 2 Ni Base Electrode 3 Cathode 4 Anode 5 Partition 6 Front Glass Substrate 7 Discharge Space

Claims (2)

[Claims] 1. The symbols A1, A2, B1 and B2 respectively represent elements, and X and Y represent real numbers of 0 to 1, and A
When 1, A2 represents an element coordinated to a position called A site, and B1 and B2 represent an element coordinated to a position called B site, the chemical formula (A1 _1-x A2
_x ) has a perovskite type crystal structure represented by (B1 _1-y B2 _y ) O ₃ and has the same structure as (B1 _1-y B 2
2 _y ) is a gas discharge type display panel characterized by using an oxide conductor containing at least a substance other than a transition element. 2. The perovskite type crystal structure has the chemical formula L
The gas discharge display panel according to claim 1, which is formed of a material represented by a _1-x Ba _x PbO ₃ .