JP2001126648A - Fluorescence display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescence display which can draw out a wiring so that an area easy to manufacture and displayable is ensured sufficiently, when drawing a wiring conductor of a cathode substrate side to a anode substrate side. SOLUTION: A terminal portion 1b of a cathode conductor 1a formed on a cathode substrate 1 is extended to a position corresponding to a side 4. Also, there is provided a first wiring conductor 2a apart from a second wiring conductor 2b for previously conducting to an anode in a position corresponding to an anode substrate 2. Through a conductive member 3 in a position of the side 4, there are electrically connected the terminal portion 1b and the first wiring conductor 2a. The wiring conductor for conducting to the anode conductor 1a can be drawn out from an opposite cathode substrate side 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a linear cathode which emits thermoelectrons and an electron emitted from a cathode such as a field electron emission type cathode, the inside of which is maintained in a high vacuum state. More specifically, the present invention relates to a fluorescent display device that obtains a desired light-emitting display by colliding with a light-emitting device, and more particularly to drawing out wiring of an anode conductor.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing a conventional fluorescent display device, and FIG. 6 is a sectional view taken along line AA of FIG. As the type of the fluorescent display device, a cathode substrate has a field emission element as a cathode, and a monochromatic phosphor layer is formed on an opposite anode substrate, so that monochrome display is possible.

In FIG. 1, reference numeral 11 denotes an anode substrate, which is a light-transmitting substrate made of a glass plate or the like. Also, the side portion 1
4, a cathode substrate 12 made of a glass plate or the like is provided. Further, in the example of FIG.
And the cathode substrate 12 are arranged in substantially the same size and shifted from each other in the short side direction. On the inner surface of the anode substrate 11, a light-transmitting anode conductor 11a is provided on one surface as shown by a dashed line, and a phosphor layer (not shown) is formed on the upper surface. And the anode conductor 11a
At the end, a terminal portion 11b is provided so as to extend, and is led out from a position of the anode substrate 11 not facing the cathode substrate 12 (a shifted portion). The display is
This is a configuration for observation through the anode substrate 11.

On the other hand, the cathode substrate 12 is provided with a cone-shaped emitter and a gate having a circular hole surrounding the emitter, which are not shown. Then, a cathode electrode and a gate for supplying electricity to the emitter are divided and arranged in a matrix, and electrons are emitted from the emitter by selectively driving both of them, so that the phosphor formed on the inner surface of the anode substrate 11 is formed. The structure is such that a graphic display can be made by selectively projecting electrons on the layer. In addition, the cathode substrate 12 is provided with a wiring conductor 12a for supplying a current to the cathode electrode and the gate, and is led out from a position of the cathode substrate 12 that is not opposed to the anode substrate 11 (a shifted portion). Have been.

On the other hand, the side surface portion 14 is made of a sealing material such as low melting point glass, and the side surfaces of the anode substrate 11 and the cathode substrate 12 are formed.
Are arranged around a mating surface of a predetermined height (for example, 200
μm) and for hermetic sealing. An exhaust chamber 15 is provided at a position where the anode substrate 11 and the cathode substrate 12 are shifted. And
A region (through hole) where a part of the side surface portion 14 is not formed is provided at a position corresponding to the exhaust chamber 15, and the inside of the fluorescent display device is evacuated from the exhaust chamber 15 through a through hole. By sealing, the inside of the fluorescent display device is maintained in a high vacuum state.

FIG. 7 is a side view showing a state in which the conventional fluorescent display device is modularized. 5 and 6
The same parts as those of the conventional fluorescent display device shown in FIG. A substrate holder 16 is attached to the bottom surface of the cathode substrate 12 via a fixing material 16a such as a double-sided tape. Further, circuit boards 17 and 20 are attached to the board holder 16 via a support member 19, and are fixed with screws 19a and the like.

On the circuit boards 17 and 20, electronic components 17 such as a power supply for driving the circuit and a driver for driving are provided.
a, 17b and 20a are provided. The flexible printed circuit board 18 a is connected to the wiring conductor 12 a formed on the cathode substrate 12 by thermocompression bonding or the like, and is electrically connected to the wiring of the circuit board 20. Similarly, the terminal portion 11b of the anode substrate 11 is electrically connected to the wiring of the circuit board 17 via the flexible printed board 18b. Further, the circuit boards 17 and 20 are provided with connectors 17c and 20b, respectively, and are electrically connected via lead wires 21.

[0008]

In the above-described fluorescent display device, the terminal portions 11b and the wiring conductors 12a are respectively derived from different substrates, and are fixed to opposing surfaces by thermocompression bonding. Therefore, the connection of the flexible printed circuit board must be made at least at two places. Further, after connecting the terminal portion 11b and the flexible printed circuit board 18b, the fluorescent display device is turned over and the wiring conductor 12a is connected to the flexible printed circuit board. Since the board 18a is connected, not only the number of components increases, but also the connection process becomes complicated. In addition, flexible
At least two printed boards are required, and it is not easy to connect a flexible printed board to a single circuit board from different directions, and the circuit board must be divided into a plurality of parts, increasing the number of components. There was a problem.

[0009] In addition, Japanese Patent Application No. 7-77115 (Japanese Patent Application Laid-Open No. Hei 8-250048) discloses that a column for withstand voltage provided in a fluorescent display device is formed of a conductive material, and this column is used. An example is described in which wiring is routed from an anode substrate to a cathode substrate. However, in order to route the wiring by using the column for withstand voltage, the position of the column is in the display area, and to maintain conduction while maintaining reliability, the column needs to have a certain size, so that display is obstructed. In addition, in some cases, there is a problem that the display unit cannot be formed and the displayable area decreases.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is an easy-to-manufacture and displayable area when a wiring conductor on the anode substrate side is routed to the cathode substrate side. It is an object of the present invention to provide a fluorescent display device from which a wiring capable of sufficiently securing the above can be drawn out. In order to achieve the above-described object, according to the present invention, there is provided an anode substrate in which an anode conductor and a phosphor layer are provided on an inner surface, and a cathode which is positioned opposite to the anode substrate and emits electrons according to claim 1. In a fluorescent display device having a cathode substrate provided with, and a side portion that holds the anode substrate and the cathode substrate at a predetermined height interval, the anode conductor has a terminal extending to the side portion. A portion is formed, a first wiring conductor is formed at a position facing the terminal portion on the cathode substrate, and a second wiring conductor for supplying electricity to at least the cathode is formed, and the side surface portion is formed on the side surface portion. A conductive member is provided between the terminal portion and the first wiring conductor, and the terminal portion and the first wiring conductor are electrically connected. According to a second aspect of the present invention, at least the surface of the conductive member is formed of a metal material. Further, in the third and fourth aspects, the conductive member is formed of a sphere, a cylinder, a prism, or a leaf spring.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a fluorescent display device of the present invention, and FIG. 2 is a sectional view taken along the line BB in FIG. The basic configuration of the fluorescent display device is the same as that of the conventional fluorescent display device. In the figure, 1 is an anode substrate,
It is composed of a transparent insulating substrate such as a glass plate. Further, a translucent anode conductor 1a indicated by a dashed line is formed on the inner surface, and a part of the anode conductor extends to the side surface portion 4 to constitute a terminal portion 1b. Further, the anode substrate 1 is provided with a phosphor layer (not shown) on the inner surface of the anode conductor 1a.

In FIG. 1, reference numeral 2 denotes a cathode substrate, which is formed of a glass substrate similarly to the anode substrate 1 and is opposed to the anode substrate 1 at a predetermined interval (for example, 200 μm to 3 mm) at the side surface portion 4. It is a configuration that is positioned and displaced from each other in the short side direction. Although not shown, a field emission cathode is formed on the inner surface of the cathode substrate 2 as a cathode. The field emission cathode has a cone-shaped emitter and a gate having an opening corresponding to the emitter,
This type of cathode emits electrons by applying a high electric field between the emitter and the gate.

In addition, the cathode substrate 2 is provided with a cathode electrode for supplying an electric current to the emitter. The cathode electrode and the gate are formed in a matrix to selectively emit electrons, and the phosphor of the anode substrate 1 is formed. For example, a graphic display is obtained by selectively striking the layers. The display is observed through the anode substrate 1. Further, the cathode substrate 2 has
A first wiring conductor 2a is formed extending to a position facing the terminal portion 1b formed on the anode substrate 1, and a second wiring conductor 2b for supplying a current to a cathode electrode and a gate separately from the first wiring conductor 2a. Are arranged adjacent to each other.

The side surface portion 4 is formed of a sealing material such as low-melting glass, and is provided with an exhaust chamber 5 having a width of about 2 to 5 mm on an outer peripheral portion where the anode substrate 1 and the cathode substrate 2 overlap with each other. An opening is left in a part of the enclosed area, and the area is arranged so as to surround the area. The side portion 4 keeps the height of the anode substrate 1 and the cathode substrate 2 as described above, and also seals the insides of both substrates with the exhaust chamber 5 to form a part of an airtight container. Further, the side surface portion 4 is formed by applying a paste-form material to the anode substrate 1 or the cathode substrate 2 by a dispenser, screen printing, or the like, and baking the two substrates in a state of being overlapped.

The exhaust chamber 5 includes the anode substrate 1 and the cathode substrate 2.
At the shifted position and at the opening of the side surface portion 4,
The inside of the fluorescent display device is evacuated and sealed in a high vacuum state. 5a is a sealing lid member. Further, although not shown, a getter material is disposed inside the exhaust chamber 5, and the getter material absorbs residual gas to maintain a high vacuum state.

A substantially spherical conductive member 3 is arranged in the side surface portion 4 so as to contact the terminal portion 1b of the anode substrate 1 and the first wiring conductor 2a of the cathode substrate 2.
The conductive portion 3 is made of a metal material such as Ni, for example, and electrically connects the terminal portion 1b and the first wiring conductor 2a. The conductive member 3 is applied to the anode substrate 1 or the cathode substrate 2 by applying a low-melting-point glass constituting the side surface portion 4, and is disposed at a predetermined position before firing, and is slightly pressurized so that the terminal portion 1 b and the first portion 1 With the wiring conductor 2a.
The conductive member 3 needs at least the diameter of the space between the anode substrate 1 and the cathode substrate 2. Preferably, the conductive member 3 has a slightly larger shape.

In addition, as the material of the conductive member 3, a metal material is applied to the surface of an insulating material such as ceramics by vapor deposition or the like, or a conductive material such as metal fine powder is mixed with the insulating material to impart conductivity. It may be a thing. In addition, the thermal expansion coefficient of the conductive member 3 can be determined by selecting a material having a low thermal expansion coefficient close to that of the low melting point glass forming the side surface portion 4 or the anode substrate 1 and the cathode substrate 2.
Thermal distortion in the firing step can be reduced.

With the above-described configuration, the terminals for supplying electricity to the anode conductor 1a of the anode substrate 1 are provided together with the second wiring conductors 2b for supplying electricity from the cathode substrate 2 to the cathode. The conductor 2a is drawn from the same surface of the same substrate.

Next, FIG. 3 shows a state in which the fluorescent display device of the present invention shown in FIGS. 1 and 2 is modularized together with a circuit board. Specifically, the substrate holder 6 is attached to the outer surface (bottom surface) of the cathode substrate 2 of the fluorescent display device via a fixing material 6a such as a double-sided tape. A circuit board 7 provided with electronic components 7a and 7b such as a power supply or a driver for driving is mounted on the substrate holder 6 via a support member 9, and is fixed by screws 9a. The first and second wiring conductors 2 a and 2 b are connected to the wiring conductor formed on the circuit board 7 by a flexible printed circuit board 8.

Here, as a procedure for modularization,
First, the support member 6 is attached to the cathode substrate 2 of the fluorescent display device. Next, one end of the flexible printed circuit board 8 is connected to the first and second wiring conductors 2a and 2b by thermocompression bonding or the like. Then, after connecting the other end of the flexible printed board 8 to the wiring conductor of the circuit board 7, the circuit board 7 may be attached to the support member 9. The above procedure is an example, and various changes may be made according to the shape and size of the fluorescent display device, the scale of the circuit board, the type of the manufacturing apparatus, and the like.

With the above configuration, the anode substrate 1
Terminal portion 1b formed on the same substrate as the first wiring conductor 2a from the cathode substrate 2 facing through the conductive member 3 together with a wiring conductor such as a cathode (second wiring conductor 2b). it can. Therefore, the connection with the wiring of the circuit board 7 can be realized by one flexible printed circuit board 8, so that the number of components is small and the number of steps such as thermocompression bonding is reduced. Can be simplified. Further, since the conductive member 3 is formed in the side portion 4 which is not originally related to the display, the conductive member 3 does not hinder the display as compared with the conventional application in which the wiring is routed using the column for the withstand voltage. The display area can be effectively used.

Next, another embodiment of the present invention will be described with reference to FIG. First, FIG. 4A uses a leaf spring made of a metal material as the conductive member 30. The leaf spring is formed by bending a strip-shaped metal material into a substantially wavy line, and the tip portion 30a in contact with the cathode substrate 2 has a shape that is easily elastically deformed. The material of the conductive member 30 is a 42-6 alloy (4) having a thermal expansion coefficient close to those of the substrates 1 and 2 made of glass.
Stainless steel materials such as 2% Ni, 6% Cr, balance Fe) and SUS430 are effective. However, other metal materials can be used as long as the width of the conductive member is smaller than the application width of the side surface portion 4 (for example, 2 mm to 5 mm).

In FIG. 4B, a prismatic or cylindrical columnar member is used as the conductive member 40. As the material, the same material as the conductive member 3 shown in the first embodiment, such as the same metal material as the conductive member 30 or a material obtained by applying a metal material to an insulating material such as ceramic, can be used.

In the above-described embodiment, an example in which a cone-shaped emitter is used as a cathode has been described. However, a carbon nanotube, a diamond thin film is used as an emitter, and a surface conductive (conductive) element (Surface Conductor) element is used.
ion Electromitter, high efficiency electron-emitting device, MIM emitter (metal-insul)
Any type can be used as long as it is formed in a flat shape on the cathode substrate 2, such as a cathode made of an ator-metal. (Nikkei BP December 14, 1998
"Flat Panel Display 1999 2"
(See pages 06 to 212)

Further, in the above embodiment, the case where the fluorescent display device is a monochrome display and there is only one anode conductor has been described as an example. can do.

[0026]

As described above, the terminal portion of the anode conductor formed on the anode substrate is used as a first wiring conductor from the opposing cathode substrate as a first wiring conductor through the conductive member to the cathode or the like. Together with the second wiring conductor. Therefore, when the module is formed into a circuit board or the like, the connection with the wiring of the circuit board can be realized with a smaller number of flexible printed boards than in the related art, so that the number of components can be reduced. Also, the number of steps for connecting the flexible printed circuit board, such as thermocompression bonding, is reduced, so that the step of modularizing the fluorescent display device and the circuit board and the like can be simplified. In addition, since the conductive member is formed in the side portion which is not originally related to the display, the display can be performed without disturbing the display as compared with a conventional wiring method using a column for withstand voltage. The area can be used effectively.

[Brief description of the drawings]

FIG. 1 is a plan view showing a fluorescent display device of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a side view showing a state in which the fluorescent display device of the present invention is modularized.

FIGS. 4A and 4B are enlarged sectional views of a main part showing another embodiment of the fluorescent display device of the present invention.

FIG. 5 is a plan view showing a conventional fluorescent display device.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a side view showing a state where a conventional fluorescent display device is modularized.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anode substrate 1a Anode conductor 1b Terminal 2 Cathode substrate 2a First wiring conductor 2b Second wiring conductor 3 Conductive member 4 Side surface portion 5 Exhaust chamber 30 Conductive member 40 Conductive member

Claims (4)

[Claims] An anode substrate having an anode conductor and a phosphor layer disposed on an inner surface thereof; a cathode substrate disposed to face the anode substrate and having a cathode for emitting electrons disposed therein; In a fluorescent display device having a side surface portion that holds a cathode substrate at a predetermined height interval, a terminal portion extending to the side surface portion is formed on the anode conductor, and the cathode substrate has the terminal portion. A first wiring conductor is formed at a position facing the terminal portion, and at least a second wiring conductor for energizing the cathode is formed, and the terminal portion and the first wiring conductor are formed on the side surface portion. A fluorescent display device, wherein a conductive member is provided therebetween, and the terminal portion and the first wiring conductor are electrically connected. 2. The fluorescent display device according to claim 1, wherein at least a surface of said conductive member is formed of a metal material. 3. The fluorescent display tube according to claim 1, wherein the conductive member is formed of a sphere, a cylinder, or a prism. 4. The fluorescent display device according to claim 1, wherein said conductive member is formed of a leaf spring.