JPH0589799A - Picture display device and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent an abnormal getter flash induced by local deterioration in degree of vacuum by enforcing gas discharge of a getter by previous heating and baking so as to suppress discharge gas at a flash time to the minimum. CONSTITUTION:An electrode structure 2 consisting of an electron emitting source, a control electrode group accelerating, focusing, deflecting or modulating electrons, and a fluophor which emitts light by hitting of electrons is arranged inside a flat vacuum container 1. The vacuum container 1 consists of a glass- made front container 3 and a metallic rear container 4, while housing the electrode structure 2 and a getter 5 inside thereof, applying circular laser welding to the metallic junction member 7 and the rear container 4 previously glass- bonded to the front container 3, and then the inside of the glass container 11 is vacuum-exhausted and sealed-off. The getter 5 to be used is previously subjected to gas discharge in a vacuum or a specific gas atmosphere such as CO2 by heating and baking up to 600 to 700 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron tube type image display device in which the inside of a tube is maintained in a high vacuum by a getter and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, in addition to a system using a liquid crystal as a flat panel image display device and a system using plasma discharge for light emission,
A method using an electron beam has been developed like a conventional cathode ray tube. Among them, the flat panel type image display device using an electron beam is one in which an electron beam is made to impinge on a desired pixel on a phosphor screen formed in a front container to emit light by an electron emission source in vacuum and a group of flat electrodes.

Generally, in an electron tube, in order to prevent a vacuum degree in the tube from being lowered by a gas remaining in the tube at the time of sealing or a gas released from a constituent material in the tube after sealing, the gas is adsorbed by a getter and the inside of the tube is absorbed. Is maintained at a high vacuum.

The getter includes an evaporation type getter which functions in both a vapor state and a vapor-deposited film by flashing on the inner wall of the tube in a vacuum, and a getter in a vacuum applied to a metal material. There are non-evaporable getters that function, and the former materials include Ba, Mg, Al, etc.
Zr, Ti, Th and the like are known as the latter material.

These are well known in the field of electron tubes, and even in a flat panel image display device using an electron beam, JP-A-60-198044 and JP-A-61-3 are used.
The technique is disclosed in Japanese Patent No. 2336 or the like.

Next, a conventional flat panel image display device will be described with reference to FIG. In a flat glass container 11, an electron emission source that emits electrons, a control electrode group that accelerates, focuses, deflects, or modulates the emitted electrons, and an electrode made of a phosphor that emits light when the electrons collide with each other. The structure 12 is provided. The glass container 11 is a front container 13 and a back container 1.
4, the electrode structure 12 and the getter 15 are housed inside, and then both are combined and sealed and joined. The sealing and bonding of the glass container 11 is generally 450-
It is performed by heating to 500 ° C. and firing. After that, the inside of the glass container 11 is evacuated and sealed.

Before or after the seal is closed, the built-in getter 15 is flashed by resistance heating, and when the seal is cut off, the gas remaining in the pipe or the gas released from the constituent materials inside the pipe causes the degree of vacuum in the pipe to change. Prevent it from dropping. In this example, a Ba alloy getter is used,
The Ba-Al alloy 15a containing Ni powder is filled in a slender metal case 15b, and a current is passed through the case 15b to heat the Ba-Al alloy 15a to about 800.
Ba-Al decomposes and reacts with Ni at ℃. This reaction is an exothermic reaction, and the reaction heat raises the temperature to 1100 to 1200 ° C., flushes Ba, and causes Ba on the inner wall of the glass container 11.
The film 16 is deposited.

[0008]

The inventors of the present invention have proposed a container structure in which a vacuum container is sealed and joined in a room temperature atmosphere by laser welding or the like without using a low melting point glass. However, in such a configuration, the getter is 45
Degassing is insufficient because a high temperature process of 0 to 500 ° C. is not performed. In addition, in the case of a flat panel image display device, C
Since the space for flashing the getter is narrow due to the structure unlike RT, a large amount of gas is released from the getter at the time of flashing and the degree of vacuum is locally deteriorated, so that there is a problem that a normal getter flash cannot be performed.

In view of the above problems, it is an object of the present invention to provide an image display device which can normally getter flash even when a vacuum container is sealed and joined in a room temperature atmosphere.

[0010]

In order to solve the above-mentioned problems, an image display device of the present invention has an electron source that emits at least an electron, a control electrode that controls the electron beam, and an electron beam that collides. An image display device comprising a fluorescent display unit that emits light and a getter, wherein a vacuum container containing these is sealed and joined in a room temperature atmosphere, and the getter is previously heated and baked in a vacuum or in a specific gas. Is.

[0011]

The present invention has the following functions due to the above-mentioned structure. That is, the getter is previously vacuumed,
Alternatively, by heating and firing in a specific gas, the unnecessary components contained therein are sufficiently released as a gas, so that the release of gas during getter flash is suppressed and the deterioration of the degree of vacuum is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of an image display device according to an embodiment of the present invention. In a flat vacuum container 1, an electron emission source for emitting electrons, a control electrode group for accelerating, focusing, deflecting, or modulating emitted electrons, and an electrode made of a phosphor that emits light when the electrons collide with each other. The structure 2 is arranged.

The vacuum container 1 comprises a glass front container 3 and a metal back container 4. The electrode structure 2 and the getter 5 are housed inside, and then the two are combined and sealed and joined. Sealing and joining of the vacuum container 1 is performed by laser-welding the metal joining member 7 previously joined to the front container 3 with low-melting glass and the back container 4 all around. After that, the inside of the glass container 11 is evacuated and sealed.

As the getter 5, a getter which is heated and baked to 600 to 700 ° C. in a vacuum or a specific gas atmosphere such as CO ₂ is incorporated in advance. Before or after sealing, the built-in getter 5 is flashed by resistance heating to deposit a Ba film 6 on the inner wall. Since the unnecessary components contained in the getter 5 are sufficiently released as a gas by heating and firing in advance, the gas released at this time can be suppressed to the minimum.

As described above, according to this embodiment, at least the electron source for emitting electrons, the control electrode for controlling the electron beam, the fluorescent display section for emitting the electron beam to emit light, and the getter are provided, An image display device in which a vacuum container containing these is hermetically sealed at room temperature, wherein the getter is heated in advance in a vacuum or in a specific gas to be fired, thereby suppressing gas release during getter flashing. It is possible to prevent abnormal getter flash caused by local deterioration of the degree of vacuum.

[0016]

As described above, the present invention includes at least an electron source that emits electrons, a control electrode that controls the electron beam, a fluorescent display unit that emits light when the electron beam strikes, and a getter. An image display device in which a vacuum container containing these is sealed and bonded at room temperature, and the getter is capable of suppressing gas release during getter flash by heating and firing in advance in a vacuum or in a specific gas. Therefore, it is possible to prevent an abnormal getter flash caused by the local deterioration of the degree of vacuum.

Therefore, it is possible to maximize the ability of the getter, and it is possible to provide a highly reliable image display device that maintains a high vacuum for a long period of time, and its industrial value is high.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an image display device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a conventional image display device.

[Explanation of symbols]

 1 vacuum container 2 electrode structure 3 front container 4 back container 5 getter 7 joining member

Claims (2)

[Claims] 1. A vacuum container having at least an electron source for emitting electrons, a control electrode for controlling an electron beam, a fluorescent display section for emitting an electron beam to emit light, and a getter. An image display device sealed and bonded in an atmosphere, wherein the getter is heated and baked in a vacuum or a specific gas in advance. 2. An electron source which emits at least electrons, a control electrode which controls an electron beam, a fluorescent display portion which emits light by being bombarded by the electron beam, and is previously heated and baked in a vacuum or a specific gas. A method for manufacturing an image display device, comprising: storing a getter in a vacuum container, and sealingly bonding the vacuum container in a room temperature atmosphere.