JPS62285340A - Manufacture of vacuum display device - Google Patents

Abstract

PURPOSE:To increase evacuation conductance, by providing a process of forming a low-melting-point glass layer on a screen glass to partially project the layer, a process of combining the screen glass and a base plate glass with each other and thereafter putting them in a vacuum device, and a process of melting the low-melting- point glass in a vacuum evacuation state to perform hermetic sealing. CONSTITUTION:A cover glass 1 having a projection 4 is overlaid on a base plate on which an electrode assembly is mounted, so that the cover glass and the base plate are assembled. The assembly of the cover glass 1 and the base plate is placed in a vacuum device fixed by a fixation jig. After evacuation is performed to 1X10<-5> torr, heating is performed to 400 deg.C so that outgassing is performed. Electriccurrent is then applied to a filament so that a barium carbonate is decomposed to an oxide. In the meantime, evacuation is performed from the interior of a bulb through a gap 5 so that the interior is put in a high degree of vacuum. After that, the bulb is heated again to 450 deg.C so that frit glass parts 3, 4 are molten, thus completing hermetic sealing. Gradual cooling is thereafter performed. The bulb is then taken out into the atmosphere. Getter flashing and aging are performed. A fluorescent character display tube is thus completed.

Description

[Detailed Description of the Invention] 1. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a display device having a glass vacuum container such as a fluorescent display tube or a plasma display, and in particular to a display device that does not use an exhaust pipe. The present invention relates to a method of manufacturing a display device.

[Conventional technology]

Conventionally, this type of vacuum display device has been constructed by forming a vacuum envelope by sealing a display glass and a substrate glass with electrodes etc. assembled in advance, and an exhaust pipe attached to a part of the envelope. After evacuating or introducing gas through a vacuum tube, the exhaust tube was tipped off to form a vacuum tube.

[Problem that the invention seeks to solve]

Therefore, in the above-mentioned conventional vacuum display device, the remaining portion of the tipped-off exhaust pipe remains in a protruding state, resulting in many inconveniences.

That is, (1) the tip of the exhaust pipe after tip-off is prone to cracking, resulting in damage during handling, packaging, transportation, etc. (2) This requires strict packaging and increases transportation costs. (3) Since the remaining portion of the exhaust pipe protrudes, it is difficult to increase the mounting density of display panels.

In addition, (4) the exhaust pipe has a small diameter, so the exhaust resistance increases. (5) Since the position of exhaust pipe installation varies depending on the user, the process of installing the exhaust pipe can be automated and IIC<
＜ Also, it is difficult to standardize parts. There were other drawbacks.

On the other hand, vacuum display devices without exhaust pipes have been proposed in recent years, but the common method is to make a hole in a part of the glass container and evacuate through the hole. The drawback was that the exhaust resistance could not be increased and the exhaust resistance was large.

[Means for solving problems]

The present invention has been made in view of the above points, and includes a process of forming a low melting point glass layer in a partially convex manner on a display glass formed without using an exhaust pipe, and a process of forming a low melting point glass layer in a partially convex manner. A method for manufacturing a vacuum display device using an exhaustless tube, which includes a step of combining the glass with glass and then putting it into a vacuum device, and a step of melting and sealing the low-melting point glass while still being evacuated. This is what we provide.

Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

FIG. 1 is a cross-sectional view of one embodiment of the present invention, in which 1 is a cover glass, a display surface glass 1' and a spacer glass 1''.
, 7-lift glass (low melting point glass) 3, and in particular, a part of the 7-lift glass 3 is provided with a convex portion 4. 2 is a substrate glass, and when combined with the above-mentioned cover glass, a gap is created by the convex portion 4.

Figure 2 shows an example of a method for forming the convex portion 4 of 7-litre glass.
A 7-litre glass paste is applied on top of the cover glass using a method such as screen printing and dried. Then, as shown in figure (b), one of the short sides of the cover glass is tilted downward and fired. A portion of the molten frit glass flows to form the convex portion 4.

FIG. 3 is a process flow of an embodiment in which the present invention is applied to a fluorescent display tube. Assemble the cover glass having the protrusion shown in Figure 2 by overlapping it with the substrate on which the electrode assembly (not shown) is mounted, fix it with a fixing jig (not shown), and install it in the vacuum device. , l X I Q tor
After evacuation to r, heat to 400°C to release gas. Electricity is then applied to the filament, decomposing the barium carbonate and converting it into an oxide. During this time, it goes without saying that the inside of the tube is evacuated to a high vacuum from the gap 5.

Next, the tube was heated to 450℃ again, and the frit glass 3
and 4 are melted to complete the sealing. After that, it was slowly cooled, taken out into the atmosphere, and subjected to getta flash and withering as in the conventional tube manufacturing process to complete a fluorescent display tube.

In this embodiment, a convex portion of 7-litre glass is provided on the cover glass side, but it goes without saying that the same effect can be obtained by providing a convex portion on the substrate glass side.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide a vacuum indicator without the remaining part of the exhaust pipe which is a fragile protrusion. Since the exhaust is exhausted, there is an advantage that the exhaust conductance can be increased.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining a method for manufacturing a cover glass of the present invention, and FIG. 3 is a schematic diagram for explaining an embodiment of the present invention. It is a process flow diagram when applied to a pipe. 1...Cover glass, 1'...Display glass, 1''...Spacer glass, 2...
...Substrate glass, 3...Low melting point glass, 4...
...Convex part of low melting point glass. O 3 Figure

Claims (1)

[Claims] A method for manufacturing a display device having a glass container in which a display surface glass and a substrate glass are welded with low melting point glass, a step of providing a convex portion on a part of the low melting point glass, and a step of providing a convex portion on a part of the low melting point glass, and a display surface glass formed by the convex portion. A display without an exhaust pipe, comprising the steps of evacuating the inside of the display device through a gap with the substrate glass, and further melting and sealing the low melting point glass while the vacuum is maintained. Method of manufacturing the device.