JPS6132336A - Plate shape image display device - Google Patents

Abstract

PURPOSE:To improve adsorptive capacity while making it possible to increase a quantity of getter by arranging ring-shaped getter and a shielding material made of steel wool formed so as to surround it in the space of a vacuum container inside wall and the back of an electrode structure. CONSTITUTION:High frequency heating type ring-shaped getter 12, which is an alloy of barium and aluminuim with added nickel powder, is set up in the space A formed by an inside wall of a vacuum container 6 and the back of an electrode structure 7 in a plate type image display device while continuously arranging a shielding material 13 made of steel wool so as to surround it. And while forming a vacuum-evaporated thin film on the inside wall of the container 6, the back of the electrode structure 7 and the surface of the shielding material 13 by heating of the getter 12, creeping of barium inside the electrode structure 7 is prevented by the shielding material 13. Accordingly, the inside of the container 6 can be maintained vacuum over a long time by sharply magnifying an area of the vacuum evaporation thin film.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flat panel image display device used in industrial electronic equipment, devices, etc. The present invention relates to the flat panel image display device used.

(Structure of the conventional example and its problems) In order to clarify the problems of the conventional flat panel image display device, the function of the getter will be explained for the cathode ray tube shown in FIG. 1, and the flat panel image display device according to the present invention will be described. Let's move on to the explanation.

In order to increase the degree of vacuum inside the electron tube, a getter is used that adsorbs gas remaining in the tube after sealing and gas released from the inner wall of the container and the metal material forming the electron tube. Getters include pariu (Ba), aluminum (At),
An evaporative getter adsorbs residual gas with a thin film deposited with metal such as magnesium (Mg), and zolconium (Zr).
), titanium (Ti), etc. There are non-evaporable ducks that make use of their ability to significantly adsorb chemical substances and gases, but the getter that is the object of the present invention is the former evaporative duck.

In FIG. 1, the cathode ray tube is housed in a glass container 2 with a conductive coating 1 formed on the inner surface of its base, an electron gun 3, various electrodes that operate the electron beam (not shown in the figure), and a shadow. A mask 4 is provided, and a getter 5 that maintains a high degree of vacuum after sealing is further provided.

The getter 5 is heated from 80° C. to 900° C. by a high-frequency magnetic field and evaporated, and is deposited as a thin barium film on the inner wall of the glass container 2, mainly on the glass container 2, the electron gun 3, the conductive film 1, and the shadow mask 4. adsorbs gases emitted by

In the case of a cathode ray tube, the gas emitted by the above parts is
This is more than other electron tubes, but it is possible to evaporate barium ivy from 1ooIV to 200° over a wide range of the inner wall of the glass container 2, so it quickly adsorbs the emitted gas and maintains a high temperature for a long time. Suction ability to maintain vacuum level is fully demonstrated.

In order to prevent the frozen Krylam from scattering on the surfaces of the electrodes arranged inside the cathode ray tube, a method is used in which nitrogen evaporates before the barium is deposited, scattering the barium and preventing it from traveling straight. The vapor-deposited thin film of barium thus formed has an improved gas adsorption ability, which is an improvement over the conventional film.

Regarding the flat image display device that is the subject of the present invention, the second
This will be explained using figures. In the figure, a flat plate image display device accelerates, focuses, and deflects an electron beam emitted from an intermediate-pressure electron source in a glass container 6.

It consists of a modulating electrode structure 7, a terminal 8 for supplying electric power and video signals to the electrode structure 7, and a phosphor that emits light by an electron beam formed on the inner surface of the glass container 6 (not shown in the figure). Further, a wire-shaped getter 9 that maintains the degree of vacuum after sealing is housed in a case 10 that heats the getter 9 by electrical resistance heat generation. After sealing the glass container 6, when a current is passed through the getter case 10 and the getter 9 is heated by the resistance heat, the barium-aluminum alloy barium-aluminum alloy barium-aluminum alloy 9 with nickel powder is added to the glass container 6. A barium vapor deposited thin film 11 is formed therein.

In such a flat-plate image display device, the number of metals, glasses, and ceramics constituting the electrode structure 7 is several times larger than that in a cathode ray tube, and in contrast, the area on which the electrode can be deposited is narrow. In particular, it can be said that the inner wall area of the glass container 6 in the flat panel image display device is extremely small compared to a cathode ray tube.

If the example in Fig. 2 is a flat panel image display device with a screen size of 10 inches, approximately 40 μ of barium will be absorbed by 100 (7
)2 to 200 cm2, and compared to a cathode ray tube with the same 10-inch screen, the amount of barium is less than half, and the area of the deposited thin film is one-seventh to one-fifth. .

As described above, in a single flat image display device,

However, there was a problem in that the adsorption performance was insufficient.

As a countermeasure, if the amount of getter 9 is increased to a size comparable to that of a cathode ray tube, barium will flow into the electrode structure 7 and terminals 8, causing a short circuit between the electrodes or between the terminals. Furthermore, even when a method of scattering barium with nitrogen and increasing the amount of barium are adopted, what are the countermeasures against the problem that the barium wraps around the electrode structure 7 and the terminals 8, causing a short circuit between the electrodes or between the terminals? It couldn't be.

As explained above, in the conventional flat panel image display device, it is not possible to obtain a performance that satisfies the suction speed during sealing and the life span of maintaining a high degree of vacuum afterward. There was a problem in that short circuits could occur between terminals or between terminals.

(Objective of the Invention) The present invention solves the above-mentioned drawbacks by increasing the amount of the getter, improving the adsorption capacity, and maintaining a high degree of vacuum for a long period of time, while short-circuiting due to wraparound to the electrode structure and terminal. It is an object of the present invention to provide a flat plate type 1i7i7 image display device that does not generate . - (Structure of the Invention) An electron source, an electrode structure that operates the electron source to generate an electron beam, and a phosphor that emits light by the electron beam are placed in a vacuum container.
In a flat image display device in which a getter is disposed to maintain a high degree of vacuum in a sealed vacuum container, a space configured such that the inner wall of the container and the electrode structure face each other, or
A getter is installed in the space made up of the opposing electrodes that make up the electrode structure, and a fibrous shielding material is placed continuously or intermittently around it to prevent the expansion of barium evaporated from the getter. At the same time, barium is vapor-deposited on the surface of the shielding material to increase the total area of the barium-deposited thin film, thereby increasing the gas adsorption rate and adsorption capacity.

In addition, by applying graphite to the fibrous shielding material, the total surface area of the shielding material is doubled by utilizing the porosity of graphite, and the area of the barium thin film deposited on it is increased, increasing the gas adsorption rate and adsorption. This is an attempt to further improve their abilities.

(Description of Embodiments) An embodiment of the present invention will be described with reference to FIG. In the figure, a glass container 6, an electrode assembly 7 and a terminal 8 (l-1, second
It is similar to the figure. In this embodiment, a high-frequency heating type ring-shaped getter 12 is installed in a space formed by the glass container 6 and the back surface of the electrode structure 7, and is continuously thick around the electrode structure 7 so as to surround this space. A shielding material 13 made of steel wool with a diameter of about 10 μm is provided. After sealing the glass container 6, when the getter 12 is heated by high-frequency heating, barium vapor deposited thin films 14 and 15 are not only formed on the inner wall of the container 6 and the back surface of the electrode structure 7, but also
A vapor deposition film is also formed on the surface of the steel wool of the shielding material 13.

In this way, even when the amount of barium scattered is 100% or more, barium does not get into the inside of the electrode structure 7 or the terminal 8, and an increased amount of barium is present.

This could be effectively used to form thin films by vapor deposition.

In a flat image display device with a screen size of 10 inches, the total area of the barium evaporated thin film formed on the surface of the steel cool shielding material 13 is about 300 cm2, and this is formed on the inner wall of the container 6. The area is equal to or larger than the area of the vapor-deposited thin film 14.

As described above, the shielding material 13 arranged so as to wrap around the getter 12 nine times prevents barium scattered from the increased amount of glue from penetrating into the inside of the electrode structure 7 and the terminal 8. Furthermore, the total area of the barium vapor-deposited thin film is dramatically expanded, the gas adsorption speed and adsorption capacity are improved when the vacuum container is sealed, and the flat image display device is capable of maintaining a high degree of vacuum for a long period of time. I can do it. The effect of using the shielding material 13 was that the adsorption speed and adsorption capacity were five times higher than that of the conventional one shown in FIG.

In the second embodiment of the present invention, steel cool constituting the shielding material 13 was coated with graphite particles "Aqua Duck" (registered trademark).

In the shielding material 13 subjected to such treatment, the total area of the barium vapor deposited thin film formed on the surface of the shielding material 13 is approximately twice as large as that of the untreated shielding material 13. Adsorption speed and adsorption capacity are improved. (Effect of the invention) As explained above, according to the present invention, the electrode Not only can barium be prevented from penetrating into the inside of the structure and Q:G, and short circuits between electrodes and terminals that occur due to shrinkage can be completely eliminated. By dramatically expanding the total area of the vacuum container, this flat image display device quickly adsorbs gas released from the container and its constituent materials when the vacuum container is sealed, and maintains a high degree of vacuum inside the container for a long period of time. is possible.

In addition, when a large shielding layer cannot be used, graphite particles can be applied to the fibrous material constituting the shielding material to increase the total area of the deposited thin film formed on the surface of the shielding material, thereby increasing the total area of the deposited thin film formed on the surface of the shielding material. It becomes possible to exhibit sufficient adsorption performance within this range.

As explained above, according to the present invention, it is possible to obtain a flat panel image display device of Chotou life that does not cause short line accidents between electrodes or between terminals. −

[Brief explanation of drawings]

FIG. 1 is a sectional view of a cathode ray tube, FIG. 2 is a sectional view of a conventional flat panel image display device, and FIG. 3 is a sectional diagram of a flat panel image display device according to the present invention. 1... Conductive film, 2.6... Glass container, 3...
・Electron gun, 4...Shadow mask, 5.9.12...
- Gutta, 7... Electrode structure, 8... Terminal, 10...
・R+3I・Case, 11, 14. 15... Vapor deposited thin film, 13... Shielding moon. Figure 1

Claims (2)

[Claims] (1) In a vacuum container, there is an electron source, an electrode structure that operates the electron source to generate an electron beam, a phosphor that emits light by the electron beam, and a getter that maintains a high degree of vacuum inside the sealed vacuum container. In a flat image display device in which a getter is installed, a getter is installed in a space where the inner wall of the container and the electrode assembly are opposed to each other, or in a space where the electrode assembly is composed of opposing electrodes. A flat image display device characterized in that a fibrous shielding material is disposed continuously or intermittently so as to surround the fibrous shielding material. (2) A flat panel image display device according to claim (1), characterized in that graphite is applied to the fibrous shielding material disposed around the getter.