JPH0644458B2 - Flat panel display - Google Patents

Description

The present invention relates to a flat panel display device.

2. Description of the Related Art FIG. 4 shows a vacuum container in a conventional flat panel display device. The dome-shaped metal container 2 is joined to the flat glass 1 by the frit glass 3 between the flange portion of the metal container 2 and the flat glass. In the following drawings, common elements are given common numbers.

FIG. 5 shows an improved construction of the conventional vacuum container shown in FIG. The dome-shaped metal container 2 is arranged on the flat glass 1 and the heat-sealing material 4 made of Pb wire or the like is arranged between the glass and the metal container, and further sandwiched by the channel member material 5 from above. In the configuration, in that state, about 300 ℃
It is melted and sealed. This technology is S
It is described on page 208 of ID82 DIGEST.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional configuration shown in FIG. 4, when the plate thickness of the metal container is increased in order to increase the pressure resistance of the metal container, the rigidity of the metal container increases and cracks occur at the joint with the glass. Occurs. On the other hand, the vacuum container shown in FIG. 5 has an improved structure shown in FIG. 4, but it is necessary to bake the container in order to raise the degree of vacuum inside the vacuum container. The temperature at this time is 300 ° C
To 350 ° C. However, since the melting temperature of the Pb wire is 300 ° C., there is a drawback that baking cannot be performed. Further, in the structure in which the container is sandwiched by the channel member materials 5, there is a problem that the sealed state of the seal portion deteriorates and a leak occurs unless a sufficient pressure is applied.

The present invention improves the above problems and provides a flat panel display device having a novel structure.

Means for Solving the Problems The present invention, a vacuum container in which a flat glass and a metal container are joined by frit glass, an electron beam generation source, an electron beam control electrode, a light emitting means, and a flat glass are arranged, The metal container is separable into an outer container made of a thin metal plate on the outside and a pressure container supporting the atmospheric pressure inside,
In the flat panel display device, only the outer container is configured to be joined to the flat glass.

Action The metal container to be joined with the flat glass is separated into two, and the glass container is joined with the outer thin metal container and the frit glass, and the atmospheric pressure acting on the vacuum container is not the inner frit joint pressure container. In order to ensure that the container is hermetically closed by frit bonding and the melting temperature of the frit glass is 450 ° C or higher, the frit glass does not melt even if baking is performed at 350 ° C. The degree of vacuum can be maintained. Further, the peeling of the seal portion due to the deformation of the metal container when the atmospheric pressure acts, which is a problem in the cited document, does not occur because the thickness of the metal container to be joined is thin.

Embodiment An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a flat panel display device, which is a flat face glass 1
The inner surface of 0 is coated with a phosphor 11. Reference numeral 12 is a linear cathode, 13 is a back electrode, and 14 is a control electrode. 1
Reference numeral 5 denotes an outer container formed by molding a thin metal plate, and an outer peripheral flange portion is sealed to the face glass 10 by a frit glass 16. FIG. 2 shows an enlarged view of the joint portion. Reference numeral 17 denotes a pressure-resistant container formed by molding a thick metal plate, which supports the atmospheric pressure acting on the container when the inside of the apparatus is evacuated. The outer shape of the pressure-resistant container 17 is the same as that of the outer container 15, and the inner surface of the outer container 15 and the outer surface of the pressure container 17 are in close contact with each other. When the inside of the apparatus is evacuated, the degree of vacuum is ensured at the frit glass joining portion between the outer container 15 and the face glass 10. Also, frit glass 16
The melting temperature is 450 ° C. Therefore 3
Baking at 50 ° C is sufficiently possible. When the inside is evacuated, the outer container 15 receives the force of the atmospheric pressure, but the outer container 15 is supported by the pressure resistant container 17 inside, so that the outer container 15 is not broken. Since the outer container 15 is made of a thin metal plate, cracks do not occur at the joint portion when it is joined to glass. Further, since the pressure resistant container is not bonded to the glass, the difference in expansion from the glass does not pose a problem. for that reason,
A material with a high expansion coefficient can be selected at low cost. In addition, in order to increase the strength of the pressure resistant container 17, a rib may be provided on the glass surface side of the pressure resistant container. FIG. 3 is a cross-sectional view of another embodiment of joining an outer container, in which a spacer 18 made of a material having a coefficient of expansion close to that of glass is inserted between the glass 10 and the outer container 15 to determine the expansion coefficient of the material of the outer container. Can be made bigger. The operation will be described with the above configuration. When the cathode 12 is heated, it emits an electron beam. The electron beam passes through the control electrode 14 and collides with the phosphor to emit light.

FIG. 6 shows another embodiment of the present invention, in which a frit 16 is joined to the periphery of a glass plate with a metal member 19 made of a metal having a coefficient of expansion close to that of glass, for example, a 42-6 alloy and having a hollowed inside. The vacuum container is formed by joining 20 parts of the outer container 15 with the metal by laser welding over the entire circumference. With this configuration, it is not necessary to raise the temperature in the container sealing step, the container can be sealed in a short time, and the expansion coefficient of the metal can be arbitrarily selected because the outer container 15 is not frit-bonded, and the cost is low. Can be used.

EFFECTS OF THE INVENTION As described above, in the flat panel display device of the present invention, the metal container can be stably joined to the flat glass, and low cost and stable characteristics can be obtained. In addition, the constituent elements can be enclosed in a high vacuum, and more stable characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a flat panel display device according to an embodiment of the present invention,
2 is a partially enlarged sectional view of the same apparatus, FIG. 3 is a partial sectional view of a flat panel display apparatus according to another embodiment of the present invention, and FIG. 4 is a sectional view of a vacuum container in a conventional flat panel display apparatus. FIG. 5 is a sectional view of a conventional vacuum container in a flat panel display device according to another conventional example, and FIG. 6 is a sectional view of another flat panel display device according to the present invention. 10 ... Face glass, 15 ... Exterior container, 16 ... Frit glass, 17 ... Pressure resistant container.

Claims (4)

[Claims] 1. A flat panel display device comprising an electron beam generator, an electron beam control electrode and a light emitting means in a vacuum container, wherein the vacuum container is formed by frit joining a flat glass and a metal container. The metal container is formed by stacking a pressure resistant container supporting atmospheric pressure and an outer container made of a thin metal plate that covers the pressure resistant container from the outside. In the frit joining of the metal container and the flat glass formed as described above, only the peripheral portion of the outer container is joined to the flat glass. 2. The flat panel display device according to claim 1, wherein the outer container and the pressure resistant container have substantially the same outer shape. 3. An electron beam generating source, an electron beam control electrode, and a light emitting means are provided in a vacuum container, and the vacuum container is composed of a flat glass and a metal container. An outer container made of a thin metal plate, and a pressure-resistant container supporting atmospheric pressure are stacked inside to form the metal container, and a metal member, which is hollowed out like a frame around the flat glass, is frit-bonded. The flat panel display device is characterized in that a vacuum container is configured by joining a peripheral portion of the outer container and the metal member. 4. The flat panel display device according to claim 3, wherein the outer container and the metal member are welded to each other.