JPH02181348A - Planar display apparatus - Google Patents

Abstract

PURPOSE:To prevent any breakage of a vacuum exhaust tube and deterioration of degree of vacuum of a finished product by providing a crystalline frit glass for fixing the vacuum exhaust tube in a hole bored in the side face of a glass container and a non-crystalline frit glass for covering the crystalline frit glass. CONSTITUTION:A non-crystalline frit glass 6 is such provided as to cover a crystalline frit glass 5. Even if microcracks are generated in the crystalline frit glass 5 caused by thermal ununiformity of a planar display 13 together with temperature elevation of a baking device 12, local heating of the crystalline frit glass 5 due to heat of an electric power sealing heater 3, temperature ununiformity of a vacuum exhaust tube 7 due to the heater 3 or the like, the microcracks can be embedded because of the non-crystalline frit glass 6 having such a property as to soften at a temperature loaded in a manufacturing process even after hardening. Therefore, any breakage of the vacuum exhaust tube 7 and deterioration of degree of vacuum of a finished product can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flat display device in the field of video equipment.

Conventional technology Traditionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to manufacture thin television receivers. was impossible. In addition, as flat display elements, EL display elements, plasma display devices, liquid crystal display elements, etc. have been recently developed, but all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display. , it has not yet been put into practical use.

Therefore, the following display devices have been developed to achieve flat display devices using electron beams.

This involves dividing the screen into multiple sections vertically, deflecting the electron beam vertically in each section to display multiple lines, and then dividing the screen into multiple sections horizontally. The R, G, B, etc. phosphors are made to emit light sequentially in each section, and the amount of electron beam irradiation to the R, G, B, etc. phosphors is controlled by the color video signal. It displays television images and is called a flat display device.

FIG. 3 is a partial cross-sectional view of a conventional flat display device and its manufacturing equipment, and shows an exhaust hole 2LO ring 22 of a vacuum exhaust device.
, a baking device 3 equipped with an electrically sealed heater device 23
0 is used. The vacuum exhaust pipe 26 of the flat display device 31 having the vacuum exhaust pipe 26 bonded to the glass container 24 with the crystal frit glass 25 is inserted into the electrically sealed heater device 23, and the tip of the vacuum exhaust pipe 26 is inserted into the electrically sealed heater device 23. Connect to the exhaust hole 21 via the O-ring 22 and connect it to the baking device 3.
Flat display bag fi while increasing the internal temperature of 0! Make the inside of P a vacuum. When the set vacuum is reached, the vacuum exhaust pipe 26 is heated, melted, sealed, and slowly cooled while gradually applying voltage to the heater 23a of the electrically sealed heater device 23, and then the above-mentioned series of steps are performed. After the process is completed, it is cut at the sealing part 27.

Problems to be Solved by the Invention However, in the above configuration, once the crystalline frit glass 25 is hardened, it has a characteristic that it does not soften or melt at the temperature applied in the manufacturing process. Thermal non-uniformity of the mold display device 31 - 1 Local heating of the surface of the crystalline frit glass 25 by the heater heat of the electrically sealed heater device 23, the electrically sealed heater device 23
Microcracks occur in the crystalline bullet glass 25 due to uneven heating temperature of the evacuation tube 26 due to the heating, which causes the evacuation tube to break and reduces the degree of vacuum of the finished product.

In addition, the crystalline frit glass 25 has strong shrinkage (such as when the interface between the surface of the crystalline frit glass 25 and the surface of the evacuation tube 26 is at an acute angle, vibrations occur during evacuation of the evacuation device). However, there was also the problem that the evacuation pipe could be bent due to thermal stress or the like when the temperature of the baking device 30 rose.

In view of the above-mentioned problems, the present invention provides a highly reliable flat display device with a structure that eliminates the occurrence of microcracks in crystalline frit glass, bending of vacuum exhaust tubes, and deterioration of the degree of vacuum in the finished product. be.

Another object of the present invention is to provide a flat display device that is configured to prevent the concentration of force due to vibrations, stress, etc. on the interface between the surface of the frit glass and the surface of the vacuum exhaust pipe, thereby reducing bending of the vacuum exhaust pipe.

Means for Solving the Problems In order to solve the above problems, a first invention of the present invention includes a glass container, a vacuum exhaust pipe, and a hole provided in a side surface of the glass container to which the vacuum exhaust pipe can be fixed. be.

Moreover, the second aspect of the present invention is characterized by the surface of the vacuum exhaust pipe.

According to the first aspect of the present invention, once the crystalline frit glass is hardened, it does not soften or melt at the temperature applied in the manufacturing process, and microcracks in the crystalline frit glass occur in the baking equipment. Even if it occurs due to thermal unevenness in the flat display device due to temperature rise, local heating of the crystalline frit glass due to the heater heat of the electrically sealed heater device H, temperature unevenness in the vacuum exhaust pipe section due to the electrically sealed heater device, etc. Even if amorphous frit glass is once hardened, it has the property of softening at the temperature applied during the manufacturing process, and this property allows it to fill in the microcracks and prevent bends in vacuum exhaust pipes.
This makes it possible to prevent the degree of vacuum of the finished product from decreasing.

Further, according to the second invention of the present invention, the amorphous frit glass has good fluidity (by controlling the shape in the powder state during coating, the surface of the amorphous frit glass and the vacuum It is possible to form an obtuse angle between the surface of the exhaust pipe and the boundary between them, which prevents stress concentration due to thermal stress, etc. when photographing during evacuation of the evacuation equipment or when the temperature rises in the baking equipment. This will prevent the vacuum exhaust pipe from breaking.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 is a schematic partial sectional view showing a baking state of a flat display device in a first embodiment of the present invention.

In the same figure, 1 indicates an exhaust hole of the vacuum evacuation device, 2 indicates an O-ring, and 3 indicates an electrically sealed heater device.
0 and an electrically sealed heater device 3 are used. 4 is a glass container, 5 is a crystalline frit glass, 6 is an amorphous frit glass formed so as to cover the crystalline frit glass 5, and 7 is an amorphous glass fixed to the glass container 4 with the crystalline frit glass 5. The evacuation tube 13 covered with a flat frit glass 6 and bonded together constitutes a flat display device including these.

The vacuum exhaust pipe 7 is inserted into the electrically sealed heater device 3, and the tip 7a of the vacuum exhaust pipe 7 is connected to the exhaust hole 1 via the O-ring 2.

The operation of the baking process of the flat display device 1t13 configured as described above will be explained with reference to FIG. First, increase the internal temperature of the baking device 12 (300~
400° C.), the inside of the flat display device 13 is evacuated. When the set vacuum is reached, the vacuum exhaust pipe 7 is heated, melted, sealed, and slowly cooled while gradually applying voltage to the heater of the electrically sealed heater device 3.
Then, after the series of steps described above are completed, it is cut.

According to this embodiment, the amorphous frit glass 6 is provided so as to cover the crystalline frit glass 5, so that thermal unevenness of the flat display device 13 due to the temperature rise of the baking device 12 and electric sealing can be prevented. Even if microcracks occur in the crystalline frit glass 5 due to local heating of the crystalline frit glass 50 due to the heater heat of the sealing heater device 3 or uneven temperature of the vacuum exhaust pipe 7 due to the electrically sealed heater device 3, - The hardened amorphous frit glass 6 has the property of softening at the temperature applied during the manufacturing process, and this property can fill microcracks and prevent the vacuum exhaust pipe 7 from breaking and the degree of vacuum of the finished product from decreasing.

Embodiment 2 FIG. 2 is an enlarged side sectional view of a vacuum exhaust pipe attachment portion of a flat display device according to a second embodiment of the present invention.

In this figure, the same parts as those in FIG. 1 are given the same numbers, and their explanations will be omitted. As shown in the figure, the surface 7 of the vacuum exhaust pipe
a and the surface 7 of the vacuum exhaust pipe 7 of the amorphous frit glass 6
The angle Q formed between the surface 6a and the surface 6a near the boundary with the surface 6a is formed to be an obtuse angle.

This amorphous frit glass 6 has good fluidity and the shape can be controlled in the powder state at the time of application, so that the surface 6a of the amorphous frit glass 6 and the surface 7a of the vacuum exhaust pipe 7 are The angle Q can be formed into an obtuse angle,
Therefore, according to this embodiment, in addition to the effects obtained in Embodiment 1, it is possible to prevent stress concentration due to vibrations during evacuation of the evacuation device 1O, thermal stress when the temperature of the baking device 12 rises, etc. This also has the effect of preventing the vacuum exhaust pipe 7 from breaking.

Effects of the Invention As described above, according to the first aspect of the present invention, since the crystalline frit glass is provided with the amorphous frit glass, the thermal imbalance of the flat display device due to the temperature rise of the baking device is reduced. - Even if microcracks occur in the crystalline frit glass due to local heating of the crystalline frit glass due to heater heat from the electric sealing heater device, or uneven temperature in the vacuum exhaust pipe section due to the electric sealing heater device, Due to its characteristic of softening at the temperature applied during the manufacturing process, it can fill in microcracks and prevent the vacuum exhaust pipe from breaking and the vacuum level of the finished product from decreasing.

Further, according to the second aspect of the present invention, an amorphous frit glass is provided on the crystalline frit glass, and
Amorphous frit glass has good fluidity (and by controlling the shape in the powder state at the time of application, the surfaces of the amorphous frit glass form obtuse angles to each other in the vicinity of the boundary). Therefore, in addition to the effect obtained with the first invention, it is possible to prevent stress concentration caused by vibrations during evacuation of the evacuation device and thermal stress when the temperature of the baking device rises, thereby preventing breakage of the evacuation pipe. can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial sectional view showing a baking state of a flat display device according to a first embodiment of the present invention, and FIG.
FIG. 3 is a partially enlarged side cross-sectional view showing the attachment of a vacuum exhaust pipe to a flat display device according to a second embodiment of the present invention, and FIG. 3 is a partial cross-sectional view of a conventional flat display device and its manufacturing apparatus. 4...Glass container, 5...Crystalline frit glass, 6...Amorphous frit glass,
7... Vacuum exhaust pipe.

Claims (2)

[Claims] (1) A glass container, a vacuum exhaust pipe, a crystalline frit glass that connects the vacuum exhaust pipe to a hole provided in a side surface of the glass container, and an amorphous frit glass that covers the crystalline frit glass. A flat display device characterized by: (2) The flat display device according to claim 1, wherein the surface of the vacuum exhaust pipe and the surface of the amorphous frit glass form an obtuse angle with respect to the boundary between them.