JPS63164148A - Fluorescent character display tube and its manfuacture - Google Patents

Abstract

PURPOSE:To obtain a fluorescent character display tube having good working efficiency and accurate connection structure by providing a lead sealed parallel to the 1st. wiring and the 2nd. wiring in the sealing portion of either of the anode substrate and the insulating substrate. CONSTITUTION:IC chips 13 are fixed onto the insulating layer 12 and the electrodes of which are connected to bonding pads 10 by means of bonding wires 14 respectively, and a shield 20 is provided on the insulating layer 12 so as to cover the bonding wires 14 and the IC chips 13, and the 2nd. conducting pads 11 provided on the both ends of the insulate 8 are connected to the wiring 9. a lead 15 is fixed onto the insulating side plate 18 so as to come into close contact with the both of inner surface and the sealing surface and to be parallel to the wiring 3 and the wiring 9 in the sealing plane, and the anode substrate 1 and the insulating substrate 8 are arranged to be faced to each other, and the conducting pad 4 on the anode substrate 1 and the conducting pad 11 on the insulating substrate 8 are connected to the lead 15 on the insulating side plate 18 mutually and sealed with the sealing glass 19 to fix the lead 15 in the sealed portion. Thereby an accurate connection structure of good working efficiency can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluorescent display tube, and more particularly to a fluorescent display tube having a structure in which a drive circuit for a display section is housed inside a vacuum container.

[Conventional technology]

Conventionally, the drive circuit for the display section of a fluorescent display tube was installed outside the vacuum container and connected to the external terminal of the fluorescent display tube, but chip-in-glass technology has built the drive circuit for the display section inside the vacuum container. A fluorescent display tube with this structure has been developed and put into practical use.

FIG. 6 is a perspective view showing an example of a conventional fluorescent display tube.

A drive circuit consisting of a display section and an IC chip 13 is provided on the anode substrate 1. In this structure, the display section constituted by the anode 2 and the mounting section of the drive circuit IC chip 13 are arranged on the anode substrate 1. As a result, the area of the display section in the entire area of the anode substrate 1 becomes small, resulting in a fluorescent display tube that is extremely large compared to the area of the display section, and the quality value cannot be sufficiently increased. In order to solve these problems, attempts have been made to mount an IC chip 13 on the inner surface of an insulating substrate 8 placed opposite to the anode substrate 1, and to connect the wiring on each substrate using various methods.

FIG. 7 is an exploded perspective view for explaining a first example of a conventional fluorescent display tube connection structure.

A silver wiring layer 23 is preliminarily formed on the insulating substrate 18 of the vacuum container by thick film printing or the like, and the silver wiring layer 23 is formed on the first conductor pad 4 on the anode substrate 1.
FIG. 8 is an exploded perspective view for explaining a second example of a conventional fluorescent display tube connection structure.

A metal strip 24 having spring properties is arranged on the first conductor pad 4 of the anode substrate 1 inside the vacuum tube container, and the other end thereof is connected to the corresponding conductor pad 11 of the insulating substrate 8.

[Problem that the invention seeks to solve]

As described above, in a fluorescent display tube having a conventional chip-in-glass structure, in order to provide the silver wiring layer 23 on the insulating substrate 18 by thick film printing, the silver wiring layer 23 is formed between the front and side surfaces of the insulating substrate 18. It is necessary to print the wiring in at least two or three times because it is not possible to provide the wiring, and furthermore, it is difficult to connect reliably at the ridge of the insulating substrate 18, and repair by brush painting or brush painting is required. The process becomes complicated,
Furthermore, it is difficult to increase the thickness of the silver wiring layer 23 using the printing method, and therefore the silver wiring layer 23 of the insulating side plate 18 and the first conductor pad 4. There were serious problems such as the inability to securely connect the second conductor pad 1 on the insulating substrate 8.

On the other hand, at least one end of the metal strip 24 having spring properties needs to be left free without being fixed, and it is difficult to reliably connect the corresponding conductor pads 11 without disturbing their pitches, especially the silver wires. There are serious problems such as when the number of layers 23 is large or the layers 23 are fine, it becomes extremely difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display tube having a chip-in-glass structure with a built-in drive circuit for a display portion, which has high working efficiency and a reliable connection structure, and a method for manufacturing the same.

[Means for solving problems]

The fluorescent display tube of the present invention includes an anode substrate having an anode formed on the surface of a transparent glass substrate, a phosphor layer coated on the anode, and a filament stretched at a distance from the anode. , a lattice disposed between the anode and the filament, a first wiring formed on the anode substrate and connecting to the anode, the filament, and the lattice, and a first wiring covering the first wiring. an insulating layer, first conductor pads connected to the first wiring and provided at both ends of the anode substrate, and a second wiring formed on the insulating substrate;
a second insulating layer covering the second wiring; and an I bonded to the second insulating layer and having an electrode terminal connected by bonding.
a C chip, a shield provided on the second insulating layer on the insulating substrate to cover the wiring and the IC chip, and a shield provided on both ends of the insulating substrate connected to the second wiring. a second conductor pad, which is provided so that the anode substrate and the insulating substrate face each other with a space therebetween and vacuum-seal their peripheries, and is arranged at right angles to the first wiring and the second wiring; a first insulating side plate and a second insulating side plate arranged in parallel.
at least one of the inner surface and the sealing surface of the first insulating side plate is fixed to one end surface and connected to the first conductive pad and the second conductive pad, and the anode substrate and the insulating substrate At least one of the sealed parts has a lead sealed in parallel to the first wiring and the second wiring.

In the method for manufacturing a fluorescent display tube of the present invention, an anode, a first wiring, and a first conductive pad connected to the first wiring are formed on a transparent glass substrate by a thick film printing method or the like, and a first insulating layer is formed. a first step of assembling a filament and a grid on the anode substrate coated with a phosphor layer on the anode; a second wiring connected to the second wiring on the insulating substrate, and a bonding pad and a second wiring connected to the second wiring; After forming two conductor pads and covering the second insulating layer, an IC chip whose electrode terminals are connected to the bonding pads is fixed on the second insulating layer, and the second The second step is to provide a shield on the insulating layer of
A lead frame, in which each lead is parallel to each other and both ends are integrally connected to a common frame, is attached to at least one of the inner surface and the sealing surface of the first insulating side plate using a press punching method or the like from a thin metal plate. The first conductor on the anode substrate is shaped so that the first wiring and the second wiring are sealed in parallel, and then the common frame is assembled into the first insulating side plate so as to protrude from the end surface. a third step of aligning the pads and the second conductor pads on the insulating substrate to correspond to the leads of the first insulating side plate and assembling the container; and fixing the assembled container with heat-resistant clips. The container is configured to include a fourth step of fixing and sealing with a sealing portion, and a fifth step of cutting the common frame protruding from the container after the sealing.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a first embodiment of a fluorescent display tube according to the first invention.

On an anode substrate 1 made of a transparent glass substrate, an anode 2 coated with a phosphor layer, a filament 7 stretched at a distance from the anode 2, and a grid 6 are arranged between the anode 2 and the filament 7. , these anodes 2. The electrodes of the filament 7 and the grid 6 are connected to wiring 3 formed on the anode substrate 1, and the wiring 3 is covered with an insulating layer 5 and connected to first conductor pads 4 provided at both ends of the anode substrate 1. ing. On the other hand, a wiring 9 is formed on the insulating substrate 8, and the wiring 9 is connected to the insulating layer 1.
2. An IC chip 13 is fixed on the insulating layer 12 , and its electrodes are connected to the bonding pads 10 with bonding wires 14 .
A shield 20 is provided on the insulating layer 12 to cover the IC chip 13, and second conductive pads 11 provided at both ends of the insulating substrate 8 are connected to the wiring 9. A lead 15 is fixed to the insulating substrate 18 in close contact with both the inner surface and the sealing surface, and parallel to the wiring 3 and the wiring 9 on the sealing surface.

The anode substrate 1 and the insulating substrate 8 are opposed to each other, and the conductor pad 4 of the anode substrate 1 and the conductor pad 11 of the insulating substrate 8 are connected to the leads 15 of the insulating side plate 18 through the insulating substrate 18 to form one seal glass. The layer 15 is then sealed to the sealing portion.

FIGS. 2(a) to 2(e) are perspective views of the connection structure in the main manufacturing steps for explaining the first embodiment of the method for manufacturing a fluorescent display tube according to the second invention.

A lead frame is formed from a 42% Ni-6% Cr-Fe alloy having a thickness of 0.2 t by a pressing method or the like. Each lead 15 is integrally connected to a common frame 115. This lead frame is shaped into a U-shape parallel to the common frame 115 so as to contact the inner surface of the insulating side plate 18 and both sealing surfaces.

The shaped lead frame is assembled into the insulating side plate 18 coated with seal glass 9 so that the common frame protrudes outside the container, and the conductor pads 4 of the anode substrate 1 and the conductor pads 11 of the insulating substrate 8 correspond to each other. 5. The assembled container is assembled into a container by aligning the container so as to correspond to the leads 15 of the insulating side plate 18. The assembled container is fixed with heat-resistant clips and sealed at the sealing portion to perform airtight sealing. After sealing, by cutting the common frame 115 protruding from the container, each glue layer 15 is electrically isolated and the hermetically sealed container is evacuated, resulting in a reliable connection structure with high working efficiency. A fluorescent display tube having a chip-in-glass structure is obtained.

FIG. 3 is a sectional view showing a second embodiment of the fluorescent display tube of the first invention.

The anode substrate 1 and the insulating substrate 8 have the same structure as in the first embodiment, but the leads 15 are sandwiched between the anode substrate 1 and the insulating side plate 18 on the anode substrate 1 side, as in the first embodiment, and form a sealing part. is fixed to. On the insulating substrate 8 side, a second
It is connected to the conductor pad 11 of and fixed using the reinforcing glass plate 17 and the frit glass 16.

FIGS. 4(a) to 4(d) are perspective views of the connection structure in the main manufacturing steps for explaining a second embodiment of the method for manufacturing a fluorescent display tube according to the second invention.

The formed lead frame is bent on the anode substrate 1 side so as to contact the inner surface of the insulating side plate 18 and the sealing surface, and on the insulating substrate 8 side, it is bent so as to contact the inner surface of the insulating side plate 18 and parallel to the insulating substrate 8 inside the container. Shape it so that it bends in the direction. For the shaped lead frame, one end of the lead 15 is aligned with the conductor pad 11 of the insulating substrate 8, which has been sealed with the insulating side plate 18 using a piece of sealing glass.
The leads 15 are held down by a reinforcing glass plate 17 coated with the same and fired to fix the leads 15 on the insulating substrate 8, and then the common frame is cut. After cutting, the conductor pads 4 on the anode substrate 1 are aligned with the corresponding leads 15, and assembled and sealed in a container.

After sealing, each lead 15 is electrically isolated by cutting and removing the common frame 115 that has come out of the container.

FIGS. 5(a) to 5(d) show the third part of the fluorescent display tube of the first invention.
FIG. 3 is a cross-sectional view of the connection structure of the embodiment.

A structure is shown in which a protrusion is provided on the lead 15 in order to more securely connect the lead 15 and the conductor pad 4.11. When the lead frame is formed by the photo-etching method, the protrusion 21 is partially half-etched, and the part that is brought into pressure contact with the conductor pads 4 and 11 is oriented toward the conductor pads 4 and 11 to reduce the thickness of the board 15. A protrusion 21 is provided by a difference. The protrusion 22 is formed toward the conductor pads 4 and 11 at a portion that is brought into pressure contact with the conductor pads 4 and 11 when forming the lead frame by press working.

〔Effect of the invention〕

As explained above, the present invention corresponds to the first and second conductor pads connected to both ends of the wiring on the anode substrate and the wiring on the insulating substrate of a fluorescent display tube with a chip-in-glass structure. Thus, a reliable connection can be made by bringing each lead provided on the insulating side plate into pressure contact, and by providing the protrusion, an even more reliable connection structure can be achieved. Furthermore, since it contacts the first and second conductor pads while being integrated into the common frame and is fixed, the common frame is cut and removed to separate each lead, which causes pitch disturbance even when the number of leads increases or becomes finer. This has the effect of providing a reliable connection structure with good work efficiency without any problems.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a fluorescent display tube according to the first invention, and FIGS. 2(a) to (e) are a first embodiment of a method for manufacturing a fluorescent display tube according to the second invention. A perspective view of the connection structure in the main manufacturing process for explaining an example, FIG. 3 is a sectional view showing a second embodiment of the fluorescent display tube of the first invention, and FIG. 4(a)
- (d) are perspective views of the connection structure in the main manufacturing steps for explaining the second embodiment of the method for manufacturing a fluorescent display tube according to the second invention, and Figs. FIG. 6 is a perspective view showing an example of a conventional fluorescent display tube, and FIGS. FIG. 3 is an exploded perspective view for explaining first and second examples of the connection structure of FIG. DESCRIPTION OF SYMBOLS 1... Positive substrate, 2... Anode, 3... First wiring, 4... First conductor pad, 5... First insulating layer,
6... Lattice, 7... Filament, 8...
Insulating substrate, 9... Second wiring, 10... Bonding pad, 11... Second conductor pad, 12... Second insulating layer, 13... IC chip, 14... Bonding wire, 15... Lead, 16... Frit glass, 17... Reinforced glass plate, 18... First insulating side plate, 19... Seal glass, 20... Shield, 21.22 ...Protrusion, 23...Silver wiring layer, 24
...Metal strip, 115...Common frame, 118...
-Second insulating side plate.

Claims (2)

[Claims] (1) An anode substrate having an anode formed on the surface of a transparent glass substrate, a phosphor layer coated on the anode, a filament stretched at a distance from the anode, and the anode and the anode. a lattice placed between the filament and the filament;
a first wiring formed on the anode substrate and connected to the anode, the filament, and the grid; a first insulating layer covering the first wiring; and a first insulating layer connected to the first wiring and connected to the anode substrate. a first conductor pad provided at both ends of the insulating substrate, a second wiring formed on the insulating substrate, a second insulating layer covering the second wiring, and a second insulating layer covering the second wiring; an IC chip fixed on the insulating layer and having electrode terminals connected to bonding pads; a shield provided on the second insulating layer on the insulating substrate to cover the connection and the IC chip; a second conductor pad connected to the wiring and provided at both ends of the insulating substrate; and a second conductor pad provided so as to face the anode substrate and the insulating substrate with a space therebetween, and vacuum-seal their peripheral edges. a first insulating side plate disposed perpendicularly to the first wiring and the second wiring; a second insulating side plate disposed parallel to the first wiring; and at least one of the inner surface and the sealing surface of the first insulating side plate. is fixed to one end surface and connected to the first conductive pad and the second conductive pad, and the first wiring and the second wiring are connected to the sealed portion of at least one of the anode substrate and the insulating substrate. A fluorescent display tube characterized by having leads sealed in parallel to. (2) The anode and the first electrode are printed on a transparent glass substrate using a thick film printing method, etc.
A first step of assembling the filament and the grid on the anode substrate, which is connected to the wiring and the first wiring to form a first conductor pad and coated with a first insulating layer, and then coated with a phosphor layer on the anode.
A second wiring is connected to the second wiring on the insulating substrate to form a bonding pad and a second conductor pad, and after coating the second insulating layer, the electrode terminal is connected to the bonding pad. a second step of fixing the IC chip on the second insulating layer and providing a shield on the second insulating layer so as to cover the connections and the IC chip; are parallel to each other and both ends are integrally connected to a common frame. A lead frame is sealed in parallel to the first wiring and the second wiring on at least one of the inner surface and the sealing surface of the first insulating side plate. After shaping the common frame so that it is fixed, the common frame is assembled into the first insulating side plate so as to protrude from the end surface, and the first conductor pad on the anode substrate and the second conductor pad on the insulating substrate are connected to each other. a third step of assembling the containers into a container by aligning the respective leads so as to correspond to the leads of the first side plate; a fourth step of fixing the assembled containers with heat-resistant clips and sealing them in a sealing furnace;
A method for manufacturing a fluorescent display tube, comprising: a fifth step of cutting the common frame protruding from the container after sealing.