JPS63116336A - Manufacture of display device - Google Patents

Abstract

PURPOSE:To make exhaust conductance larger as well as to secure such a vacuum vessel that is of high vacuum and excellent reliablity, in a short exhaust time, by installing a recessed part and/or a projecting part in a part of low fusing point glass of a cover member. CONSTITUTION:A vacuum envelope 1 and a cover member 4 are combined together, charging them into a vacuum device, and the inside of a display unit is exhausted in a vacuum via a clearance to be produced by a recessed and/or projecting part through an exhaust port 2. And, after a filament is energized with a continuous rating current, heated and decomposed, furthermore in a state of being left exhausted intact, low fusing point glass 3 is fused, thus a fluorescent character display tube is completed. The recessed part is radially put on the low fusing point glass 3 of the cover member 4 whereby exhaust efficiency is well improvable. As an example of formation of the recessed part, first, the low fusing point glass 3 is applied to the top of the cover member 4 by means of dipping, etc., and baked, and the recessed part is formed by press work at time of proper viscosity in the point midway in cooling operation after baking.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display device having a glass vacuum envelope such as a fluorescent display tube or a plasma display, and in particular to manufacturing a display device without using an exhaust pipe. Regarding the method.

[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 then using an exhaust gas provided in a part of the envelope. A vacuum tube is formed by evacuation or gas introduction through a small gap between the low-melting glass of the lid member and the vacuum envelope through the hole, and then melting the low-melting glass of the lid member.

[Problem that the invention seeks to solve]

Therefore, in the conventional vacuum display device described above, the gap between the low melting point glass of the lid member and the vacuum envelope is narrow, so the exhaust resistance is large and it takes a long time to exhaust the gas generated inside the tube. This made it difficult to increase production efficiency and to evacuate to a high vacuum.

[Means for solving problems]

The present invention has been made in view of the above problems, and includes a step of forming a concave and/or convex portion in a part of the low melting point glass of the lid member, and a step of forming a concave portion and/or a convex portion in a part of the low melting point glass of the lid member, and after combining the vacuum envelope and the lid member. The present invention provides a method for manufacturing a vacuum display device without an exhaust pipe, which includes a step of charging the lid, and a step of melting and sealing the low-melting glass of the lid member while the button is evacuated.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a side view of one embodiment of a fluorescent display tube according to the present invention. 1 is a vacuum envelope, which is composed of a display surface glass, a spacer glass, a filament, a grid, a substrate glass, etc. (not shown). Reference numeral 2 represents an exhaust hole, and reference numeral 4 represents a lid member in which a portion of the low melting point glass 3 is provided with a concave and/or convex portion. The above-mentioned vacuum envelope 1 and lid member 4 are combined and put into a vacuum device, and the exhaust hole 2
The interior of the display device is evacuated through the gaps created by the concave and/or convex portions, and the filament is decomposed by being heated with electricity, and then the low melting point glass 3 of the lid member is further evacuated in the evacuated state. It was melted to complete a fluorescent display tube.

FIG. 2 shows an example of the shape of the recesses in the low melting point glass 3 of the lid member 4, and by providing the recesses radially, the exhaust efficiency can be increased. An example of a method for forming the recess is
First, the low melting point glass 3 is applied onto the lid member 4 by a method such as dipping and fired.

When the viscosity is appropriate during cooling after firing, a stone is pressed to form a concave part.

FIG. 3 shows another embodiment. By providing a convex portion on the low melting point glass 3 on the lid member 4, the exhaust efficiency can be further improved with a small amount of low melting point glass.

Figure 4 is a diagram showing the pumping speed of filament decomposition gas when making a fluorescent display tube, and the vertical axis shows the pressure inside the vacuum device (t
orr) Time (seconds) is plotted on the horizontal axis.

A is the pumping speed when the conventional lid member (FIG. 5) is used, and B is the pumping speed when the lid member of the present invention (FIG. 2) is used. From this figure, it is clearly seen that the present invention improves the exhaust efficiency.

〔Effect of the invention〕

As explained above, the present invention makes it possible to increase the exhaust conductance by providing a concave and/or convex portion in a portion of the low melting point glass of the lid member, and to obtain a highly reliable vacuum container with a high vacuum in a short evacuation time. It has the effect of

[Brief explanation of the drawing]

Figure 1 is a side view when the present invention is combined, Figure 2 (al
, (bl, Fig. 3 Extension 1. (b), Fig. 5 (a), (
b) shows a front view and a sectional view of the lid member, respectively. FIG. 4 is a characteristic diagram of pumping speed. 1... Vacuum envelope, 2... Exhaust hole, 3
...Low melting point glass, 4...Lid member. Figure F51 (ku) (b) Ward 3 Figure 5

Claims (1)

[Claims] An exhaust hole is provided in a part of the glass vacuum envelope formed by sealing the display surface glass and the substrate glass with low melting point glass, and this exhaust hole is sealed with the low melting point glass using a lid member. A method for manufacturing a display device in which a vacuum atmosphere is formed inside an envelope includes a step of providing a concave and/or convex portion in a part of the low melting point glass of the lid member, and a step of forming a concave and/or convex portion on a portion of the low melting point glass of the lid member; An exhaust pipe characterized in that it is manufactured by a step of evacuating the inside of the display device through a gap with the vacuum envelope, and further a step of melting and sealing the low melting point glass of the lid member in the evacuated state. A method of manufacturing a display device without.