JPH0362439A - Image display device - Google Patents

Abstract

PURPOSE:To prevent the crack of frit glass by providing a conductive material between the frit glass for sealing a chargeable glass vessel onto a metal surface and the connection surface of the vessel, and grounding the conductive material. CONSTITUTION:A glass vessel 2 is so made as to be airtight after sealed to a rear metal plate 4 with frit glass 5, and the function part of an image display device is housed therein. A high voltage terminal 1 and an electrode terminal 3 are led outside from the airtight vessel, and the surface of the glass vessel 2 is charged to high voltage. A conductive material 6 is placed between the flange part 2a of the glass vessel 2 and the frit glass 5, and grounded, thereby preventing the charging of the glass vessel 2. According to the aforesaid construction, the frit glass 5 becomes free from fracture due to charging.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flat panel image display device for displaying characters and images, and particularly describes a method for improving the reliability of the image display device.

Conventional technologyWe extract an electron beam from multiple linear hot cathodes,
Characters, images, etc. are constructed by colliding an electron beam controlled by an electron beam control electrode against a phosphor screen. In Figure 0, 51 is a back electrode, and multiple electrodes 52A to 522 are connected to each other. Electron beam 7 emitted from the linear hot cathode
2 to face the front. Reference numeral 53 denotes an electron beam extraction electrode for extracting electrons from the linear hot cathodes 52a to 52b. This electrode 53 has an electron beam 72
f! passed from 64! A through hole 63 is provided through which the electron beam 72 passes. 55 and 56
are a first focusing electrode and a second focusing electrode for focusing the electron beam 72 in horizontal and vertical directions. These electrodes 55 and 56 are provided with through holes 64 and 65 through which the electron beam 72 passes. 68 is electron beam 7
This is a horizontal deflection electrode for deflecting the comb-shaped electrodes 5 and 570 in the horizontal direction of the screen. These comb-shaped electrodes 5 and 570 form a slot 67 through which the electron beam 72 passes. 71 is a vertical deflection electrode for deflecting the electron beam 72 in the vertical direction of the screen, and is composed of a pair of comb-shaped electrodes 58a and 580. The interdigitated electrodes 58a and 580 form a slot 70 through which the electron beam 72 passes. 60 is a front glass container, and the inner surface of the container 60 has three color phosphor layers of red, green, and blue, a black stripe layer provided between them, and a metal back layer provided behind them. A screen 73 is configured. Reference numeral 61 denotes a metal plate serving as a transfer device, and together with the front glass container 60, constitutes a vacuum container.

In order to apply a voltage to each electrode in the flat panel image display device having such a structure, a terminal is provided from each electrode around the area between the front glass container 60 and the back metal plate 61. A sectional view at this time is shown in FIG. In the figure, 1 is a high voltage terminal, to which a voltage of around 10 KV is normally applied. 2 is a front glass container corresponding to 60 in FIG. 3, and 4 is a third container.
This is the back metal plate corresponding to 61 in the figure. 3 is an electrode terminal, to which a voltage of several tens of volts to several hundred volts is normally applied. 5 is a frit glass for sealing the front glass container 2 and the back metal plate 4 and for adhering the electrode terminal 3 therebetween in a sandwich-like manner.

Problems to be Solved by the Invention Under such driving conditions, the front glass container 2 is charged to several kilovolts by the voltage applied to the high voltage terminal 1.

The electric charge charged on the front glass container 2 is discharged to the electrode terminal 3 through the flint glass 5. By repeating this, a crank occurs in the frit glass 5,
There is a problem that leaks occur from the sealing surface.

In view of this problem, the present invention aims to prevent the occurrence of cranking of the frit glass, and furthermore, to prevent high voltage leakage.

Means for Solving the Problems In view of the above problems, the present invention provides a conductive material between the inner surface of the flange of the front glass container and the frit glass, and by grounding this, the surface of the front glass container is charged with electricity. The purpose of this method is to remove the electric charges generated by the electrode terminals and essentially shield the electrode terminals from high voltage.

By applying a high voltage to the working high voltage terminal, the front glass container is electrically charged, and the surface is charged with electric charge.

Conventionally, the electric charge charged on the surface of the front glass container was discharged to an electrode terminal provided on the front glass container via an amorphous frit, but according to the present invention, the electric charge charged on the surface of the front glass container was discharged to an electrode terminal provided on the front glass container via an amorphous frit. By providing a conductive material between the frit glass and grounding it, the electric charge accumulated on the inner and outer surfaces of the front glass container is removed, thereby preventing cracks from forming on the frit glass and furthermore on the front glass container. This allows the vacuum state of the container to be maintained for a long period of time.

EXAMPLE Hereinafter, an example of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view showing one embodiment of the present invention. In this embodiment, a conductive material 6 is provided between the flange portion 2a of the front glass container 2 and the amorphous frit glass 5, and this is grounded. This is what I did. In this embodiment, a film of IT○ is used as the conductive material 6, and the flange portion 2a of the front glass container 2 is
is deposited on the inner surface of the

In this configuration, by applying a high voltage to the high voltage terminal l, all of the electric charge on the surface (inner surface and outer surface) of the front glass container 2 is transferred to the flange portion 2a of the front glass container 2 and the amorphous frit glass 5. Conductive material 6 provided between
It is discharged through. For that purpose, electrode terminal 3
The 0-wire configuration has been described in which the electrode terminal 3 is provided on the sealing surface between the front glass container 2 and the back metal plate 4, but when there is no electrode terminal on the sealing surface (the back metal plate is A similar effect can be obtained even if the terminal is provided vertically through the terminal.

In contrast, the present applicant has previously applied for the means shown in FIG. As shown in Figure 2, this is a front glass container 1.
A conductive material 7 is provided around the outer surface of the conductive material 7, and this is grounded. According to this configuration, by applying a high voltage to the high voltage terminal 1, the electric charges accumulated on the outer surface of the front glass container 2 are discharged through the conductive material 7. As a result, the electric charge on the outer surface of the front glass container 2 is significantly reduced. However, since electric charges remain on the inner surface of the front glass container 2 and are discharged through the amorphous frit glass 5, the problem remains that the occurrence of cranks on the sealing surface cannot be completely eliminated.

In this embodiment, since the grounding is achieved through the conductive material 6 between the flange portion 2a and the frit glass 5, electric charges accumulated on the surface (inner surface, outer surface) of the front glass container 2 are removed as described above. All can be discharged and completely protected.

Effects of the Invention As described above, according to the present invention, a conductive material is provided between the front glass container and the frit glass, and this is grounded to provide high voltage shielding, thereby ensuring that the electric charge on the front glass container is removed. This makes it possible to prevent cranks from occurring on the sealing surface and maintain the vacuum inside the image display device for a long time.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the image display device of the present invention, FIG. 2 is a cross-sectional view showing the configuration of the main part of an image display device proposed prior to the present invention, and FIG. FIG. 4 is a perspective view showing the structure of an image display device, and FIG. 4 is a sectional view showing the conventional structure. 2... Front glass container, 2a... Flange, 4... Back metal plate, 5... Frit glass, 6... Conductive material.

Claims (1)

[Claims] (1) A plurality of linear hot cathodes, an electron beam extraction electrode for extracting an electron beam from the linear hot cathode, and an electrode provided opposite to the electron beam extraction electrode with the linear hot cathode in between. The device includes a back electrode, a deflection electrode that horizontally and vertically deflects the electron beam emitted from the linear hot cathode, and a fluorescent screen that emits light upon collision of the electron beam, and displays the linear hot cathode and each electrode. In an image display device that is held by a glass container and a back metal plate to form a vacuum container, the flange of the front glass container and the back metal plate are sealed with a frit glass, and the flange of the front glass container and the frit glass are sealed together. An image display device characterized in that a conductive material is provided between the two and the conductive material is grounded to provide high voltage shielding.