JPH02239549A - Plane type display device - Google Patents

Abstract

PURPOSE:To increase the pressure withstand and enhance the sealing performance by separating a metal vessel to be coupled with a flat glass into two, performing coupling with glass by frit glass and metal vessel with small wall thickness on the outside, and allowing the atmosphere pressure applied to a vacuum vessel to be borne by a pressure withstand vessel located inside which is not frit jointed. CONSTITUTION:By frit glass 16, an exterior vessel 15 shaped from a thin metal sheet is sealed fast to a face glass 10 at a flange part on the periphery. A pressure withstand vessel 17 shaped from a thick metal plate bears the atmospheric pressure applied to vessel when inside the device is evacuated. When the inside is evacuated, this exterior vessel 15 receives the action of atmospheric pressure, which is however borne by the pressure withstand vessel 17 situated inside, so that there is no fear of breakage of the exterior vessel 15. Because it is made of thin metal sheet, there is no risk either of crack initiation at the joint part when to be jointed with glass.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a flat panel display device.

BACKGROUND OF THE INVENTION FIG. 4 shows a vacuum container in a conventional flat panel display device. It has a structure in which a dome-shaped metal container 2 is connected to a flat glass 1, and the flange portion of the metal container 2 and the flat glass are joined by a frit glass 3. Note that common elements in the following drawings are given common numbers.

FIG. 5 shows an improved configuration of the conventional vacuum container shown in FIG. 4. A dome-shaped metal container 2 is placed against a flat glass 1.
A heat-sealing material 4 made of a wire or the like is placed between the glass and the metal container, and is further sandwiched between channel member materials 5 from above, and is melted at about 300° C. in the lowered state. It is used for sealing. This technology. is S
It is described on page 208 of ID82DIGEST.

Problems to be Solved by the Invention In the conventional configuration shown in Figure 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, although the vacuum container shown in FIG. 5 is an improved structure of FIG. 4, it is necessary to bake the container in order to increase the degree of vacuum inside the vacuum container. The temperature at this time is 300℃
to 350°C. However, since the melting temperature of the Pb wire is 300° C., baking cannot be performed. Furthermore, the structure in which the container is sandwiched between the channel member materials 5 has a problem in that unless sufficient pressure is applied, the sealing condition of the seal portion deteriorates and leakage occurs.

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

Means for Solving the Problems The present invention provides an electron beam generation source, an electron beam control electrode, a light emitting means, and a flat glass in a vacuum container in which a flat glass and a metal container are joined by a frit glass. The metal container can be separated into an exterior container made of a thin metal plate on the outside and a pressure-resistant container that supports atmospheric pressure inside,
The flat display device is characterized in that only the outer container is connected to the flat glass.

The metal container to be joined to the flat glass is separated into two parts, and the glass is joined to the outer thin metal container using a frit glass. In order to use a structure in which the container is used as a container, the container is sealed with a frit bond, and the melting temperature of the frit glass is 450°C or higher, so even if baking is performed at 350°C, the frit glass will not melt. It is possible to maintain a certain degree of vacuum. Furthermore, peeling of the seal portion due to deformation of the metal container when atmospheric pressure is applied, which was a problem in the cited document, does not occur because the wall thickness of the metal container to be joined is made thin.

Example An embodiment of the present invention will be described based on FIG.

FIG. 1 is a sectional view of a flat panel display device, in which the inner surface of a flat face glass 10 is coated with phosphor IL. 12
13 is a back electrode, and 14 is a control electrode. Reference numeral 15 denotes an outer container made of a thin metal plate, and its outer flange portion is sealed to the face glass 10 with a free glass 16.

Figure 2 shows an enlarged view of the joint. Reference numeral 17 is a pressure-resistant container formed from a thick metal plate, which supports the atmospheric pressure acting on the container when the inside of the apparatus is evacuated. The external shape of the pressure 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 configured to be in close contact with each other. When the inside of the apparatus is evacuated, the degree of vacuum is ensured at the frit glass joint between the outer container 15 and the face glass 10. Further, the melting temperature of the frit glass 16 used is 450°C. Therefore, baking at 350°C is fully possible. When the inside is evacuated, the outer container 15 receives the force of atmospheric pressure, but the inner pressure container 17
Since the outer container 15 is supported by the outer container 15, the outer container 15 will not be destroyed.

Since the outer container 15 is made of a thin metal plate, cracks will not occur at the joint when it is joined to glass.

Furthermore, since the pressure container is not bonded to glass, the difference in expansion with glass is not a problem. Therefore, it is possible to select a material that is low cost and has a high coefficient of expansion. Note that in order to increase the strength of the pressure container 17, ribs may be provided on the glass surface side of the pressure container. FIG. 3 is a sectional view of another embodiment of joining the outer container, in which a smoother 18 made of a material whose expansion coefficient is similar to that of glass is inserted between the glass lO and the outer container 15, so that the expansion coefficient of the material of the outer container is You can make it bigger. The operation will be explained using the above configuration. When the cand 12 is heated, it emits an electron beam. The electron beam passes through the control electrode 14, collides with the phosphor, and emits light.

FIG. 6 shows another embodiment of the present invention, in which a frit 16 is joined to a metal plate 19 made of a metal whose expansion coefficient is similar to that of the glass, for example, a 42-6 alloy, and an outer container 1
The vacuum container is constructed by joining the metals No. 5 and No. 5 by laser welding at 20 locations around the entire circumference. With this configuration, there is no need to raise the temperature during the sealing process of the container, sealing can be performed in a short time, and since the outer container 15 is not frit-bonded, the expansion coefficient of the metal can be arbitrarily selected, making it possible to use low-cost metal. can be used.

Effects of the Invention As described above, in the flat display device of the present invention, a metal container can be stably bonded to a flat glass plate, and stable characteristics can be obtained at low cost. Additionally, the components can be encapsulated in a high vacuum, resulting in even more stable characteristics.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flat panel display device according to an embodiment of the present invention;
FIG. 2 is an enlarged partial cross-sectional view of the same device, FIG. 3 is a partial cross-sectional view of a flat panel display device according to another embodiment of the present invention, and FIG. 4 is a cross section of a vacuum container in a conventional flat panel display device. 5 is a sectional view of a conventional vacuum container in a flat panel display device according to another embodiment of the prior art, and FIG. 6 is a sectional view of another flat panel display device of the present invention. 10...Face glass, 15...Outer container, 16
...Fritted glass, 17...Pressure container. Name of agent: Patent attorney Shigetaka Kurino Name: Figure 2 Figure 3 Figure l / Tomi 6 Figure

Claims (4)

[Claims] (1) An electron beam generation source, an electron beam control electrode, and a light emitting means are provided in a vacuum container, and the vacuum container is constructed by frit-bonding a flat glass and a metal container, and a thin metal The metal container is constructed by stacking an outer container made of plates and a pressure-resistant container that supports atmospheric pressure inside, and only the outer container is bonded to the flat glass. Device. (2) The flat panel display device according to claim 1, wherein the outer shape of the outer container and the outer shape of the pressure-resistant container are substantially the same. (3) An electron beam generation 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, and the metal container has a thin wall on the outside. An outer container made of metal plates is constructed by stacking a pressure-resistant container that supports atmospheric pressure inside, a metal plate is frit-bonded around the flat glass, and the outer container and the metal plate are bonded. A flat panel display device characterized in that a vacuum container is configured by (4) The flat panel display device according to claim 3, wherein the outer container and the metal plate are joined by welding.