JPH10283954A - Image display element and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display element, such that an increase in the size of its outer edge resulting from providing an electrode takeout wire on a side end face can be restrained, and a method for manufacturing the same. SOLUTION: An FED(field emission display device) 10 is equipped with an exhaust hole 36 provided through a back plate 18 along the direction of its thickness and a plurality of mutually insulated wires provided to electrically connect pluralities of cathode electrodes 28 and gate electrodes 30 to a plurality of back wires provided outside an airtight space 20, the cathode and gate electrodes 28, 30 being provided on one side 14 of the back plate 18 via the exhaust hole 36. Therefore, because the cathode electrodes 28 and the like, provided on one side of the back plate 18, are connected by wires to the back wires via the exhaust hole 36 provided in the back plate 18, the need to provide wires on the side end face of the FED 10 to connect the FED 10 is eliminated. Thus, an increase in the size of an outer edge resulting from providing connecting wires on the side end face is restrained in a desirable fashion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and a method of manufacturing the same, and more particularly, to an improvement in a structure for connecting internal electrodes to external electrode terminals.

[0002]

2. Description of the Related Art For example, when an image is displayed for a large number of viewers indoors or outdoors such as a stadium, an extremely large display surface is required due to a long viewing distance. 2. Description of the Related Art A multi-screen image display device in which a large display surface is formed by arranging a large number of small tile-type display elements capable of displaying in a matrix is used. It is difficult to integrally form an image display device having a large display surface, and when displaying one image as a whole, when the viewing distance is long, the boundaries between the display elements particularly hinder the continuity of the image. Because there is no. Such a display element is, for example, a fluorescent display tube (Vacu) that excites a phosphor with electrons emitted from an electrode to emit light.
um Fluorescent Display (hereinafter referred to as VFD), a field emission display (hereinafter referred to as FED), a plasma display panel (hereinafter referred to as PDP) using gas discharge, and the like.

The above-mentioned VFD and FED are composed of a plurality of anodes and a phosphor layer fixed on the anodes on one surface of one of the pair of flat plates facing an airtight space formed between the pair of flat plates. A cathode is provided at a position separated from the one surface in the airtight space by a predetermined distance,
By causing electrons generated from the cathode to collide with the phosphor layer, the phosphor layer selectively emits light. Further, the PDP has a discharge electrode in an airtight space formed between a pair of flat plates, and emits light using plasma generated by discharge. In order to obtain a desired emission color in this PDP, a phosphor is provided in the discharge space, and the phosphor excited by ultraviolet rays generated by the plasma emits light. Therefore, since both are self-luminous display elements, a wide viewing angle and clear display can be obtained with low power consumption, and color display can be performed by preparing phosphor layers having different emission colors. And so on. In addition, each display element constitutes a display device having a large display surface without deteriorating the definition of display by forming a plurality of light-emitting spaces by forming partitions in an airtight space as necessary. Work efficiency is improved.

[0004]

In order to display a fine image on a display device in which a large number of display elements are arranged as described above, the partition walls are formed thin and the adjacent display elements are formed with each other. It is desired to make the gap between the two as small as possible. Therefore, the terminals of the electrodes provided in the hermetic space of each display element are described in, for example, JP-A-7-13.
As described in Japanese Patent No. 4559, the light is extracted to one or the other back surface (one surface not facing the airtight space) of the pair of flat plates via the side end surface of the display element.

However, when the electrode is taken out via the side end face as described above, the electric insulation between the wiring provided on the side end face and the wiring of the display element arranged adjacently is taken. Needs to be secured. In the method of connecting the electrodes of a plurality of display elements to each other and driving them integrally, the driving voltage is increased to make it difficult to secure the withstand voltage, and the uniformity of the display elements due to the influence of the voltage drop and the like. This is because it becomes difficult to obtain display quality. As a method of ensuring the above-mentioned electrical insulation, a method of designing the wiring positions on the side end surfaces so that adjacent elements are different from each other, or a method of covering the side end surfaces of individual display elements with an insulating film made of glass or the like. Can be considered. In the former method, the latter method is generally employed because the electrode structure of the display element is complicated. Therefore, the interval between the display elements increases in accordance with the thickness of the insulating film, so that the display dot pitch (hereinafter, simply referred to as the dot pitch) at the boundary between the display elements becomes coarse, and the continuation of the image on the display device is reduced. There is a problem that the property is reduced. In addition, since the side end surface of the display element is exposed to the atmosphere, a change over time such as migration of silver (Ag), lead (Pb) or the like occurs due to rainwater or dew condensation, and the wiring is easily deteriorated. However, as the thickness of the insulating film is reduced for the purpose of enhancing the continuity of the image as much as possible, the deterioration becomes more remarkable.

[0006] Even in a display device composed of a single display element, when an electrode is taken out through a side end face of the display element, the above-described temporal change is suppressed to protect the wiring. Therefore, an insulating film needs to be provided. In such a display device, the problem of image continuity does not occur, but the size of the device is enlarged by the insulating film provided on the side end surface. The thickness increases as the thickness of the insulating film increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image display device capable of suppressing an increase in outer edge dimension caused by providing an electrode extraction wiring on a side end surface. And a method for manufacturing the same.

[0008]

In order to achieve the above object, the gist of the image display element of the first invention is that the image display element is positioned at a predetermined distance from each other and has an airtight space therebetween. , A plurality of electrodes provided on the inner surface of the first flat plate for generating light emission in the hermetic space, and a plurality of electrodes provided outside the hermetic space. An image display device comprising: a plurality of electrode terminals each of which is electrically connected; and (a)
(B) electrically connecting each of the plurality of electrodes to each of the plurality of electrode terminals through the at least one through hole provided through the first flat plate in the thickness direction; And a plurality of connection lines insulated from each other.

[0009]

According to this structure, the image display device has at least one through hole provided through the first flat plate in the thickness direction and the first through the one through hole.
A plurality of connection wires provided to electrically connect each of the plurality of electrodes provided on the inner surface of the flat plate to each of a plurality of electrode terminals provided outside the hermetic space, and insulated from each other And are provided. Therefore, since the electrode provided on the inner surface of the first flat plate is connected to the electrode terminal by the connection wire through the through hole provided on the first flat plate, the electrode is connected to the side end surface of the image display element for the connection. There is no need to provide wiring. Therefore, expansion of the outer edge dimension of the element due to the provision of the connection wiring on the side end surface is suitably suppressed.

[0010]

According to another aspect of the first invention, preferably, the image display element includes a column-shaped wire fixing member for connecting the plurality of connection wires with an inorganic binder in a state of being separated from each other. The plurality of connection lines are provided on the first flat plate by being fitted into and fixed to the first flat plate.
According to this configuration, the columnar wire fixing member that couples the plurality of connection wires in a state of being separated from each other is fitted and fixed in the through hole, so that the plurality of connection wires are insulated from each other. Is provided on the first flat plate of the image display element.
Therefore, since the plurality of connection wires are mutually insulated while being connected by the wire fixing member, the occurrence of insulation failure therebetween is suppressed, and the reliability of the image display element is reduced. Enhanced.

Preferably, the through hole is an exhaust hole provided for exhausting from the airtight space, and the through hole is provided when the plurality of connection lines are provided in the through hole. A communication hole for communicating the inner surface of the first flat plate with the back surface opposite to the inner surface is formed on the inner peripheral side of the first flat plate. According to this configuration, since the exhaust hole necessarily provided in the image display element having the airtight space therein is used as the through hole, a step for forming the through hole for providing the connection line is not required. Therefore, an increase in the number of steps is suppressed, and the design of the display element is suppressed from being complicated for the purpose of providing a through hole avoiding a plurality of electrodes provided on the inner surface of the first flat plate. In addition, even when a plurality of connection lines are provided in the through hole, a communication hole for communicating the inner surface and the back surface of the first flat plate is formed on the inner peripheral side of the through hole. Since the function is not lost, there is no problem when exhausting from the airtight space.

[0012]

The gist of the method for manufacturing an image display device according to the second aspect of the present invention for achieving the above object is that the image display devices are positioned at a predetermined distance from each other. A first flat plate and a second flat plate forming an airtight space between them;
A flat plate, a plurality of electrodes provided on the inner surface of the first flat plate for generating light emission in the hermetic space, and each of the plurality of electrodes provided outside the hermetic space to electrically A method of manufacturing an image display device including a plurality of electrode terminals to be connected, wherein (a) a through-hole forming step of providing a through-hole in the first flat plate, and (b) a column-shaped wire fixing member. A metal wire fixing step of bonding a plurality of metal wires with an inorganic binder in a state of being separated from each other, and (c) fitting and fixing the wire fixing member to which the plurality of metal wires are fixed in the through hole. A metal wire arranging step of arranging the plurality of metal wires in the through hole by (d) at both ends of the wire fixing member fitted and fixed in the through hole,
A connection step of mutually connecting the plurality of metal wires and each of the plurality of electrodes and the plurality of electrode terminals,
To include.

[0013]

In this way, in the through hole forming step, the first flat plate is provided with a through hole, and in the metal wire fixing step, a plurality of metal wires are formed using the columnar wire fixing member. A plurality of wires are fixed in the through-hole by being fixed to the through-hole by fixing the wire fixed to the metal wire in the subsequent metal wire arranging step in the state where they are separated from each other by the inorganic binder. Further, in the connecting step, the plurality of metal wires, the plurality of electrodes, and the plurality of electrode terminals are connected to each other at both ends of the wire fixing member. For this reason, the plurality of connection lines are formed by fitting and fixing the metal wires, which are previously insulated from each other by the wire fixing members, into the through holes provided in the first flat plate. Since the electrodes and the electrode terminals are provided in the through holes and the metal wires, ie, the connection wires, are connected to the metal wires, that is, the connection wires, it is not necessary to provide the connection wires on the side end surfaces, so that the outer edge dimension of the image display element can be suitably suppressed from increasing. Moreover, according to the above-described manufacturing method, there is an advantage that it is easy to secure the insulation between the connection lines, and the process of providing the connection lines and connecting the electrodes and the electrode terminals is simplified.

Incidentally, when manufacturing a conventional image display element in which connection wiring is provided on the side end face, since the connection wiring is formed on the side end face by a thick film printing method or the like, an electrode provided on the inner face or an external It is necessary to align with the electrode terminals provided on the substrate, which complicates the manufacturing process. In addition, since connection wirings are generally provided on a plurality of side end surfaces, it is often necessary to print each side end surface. There was a problem that a process was required.

[0015]

Preferably, in the connecting step, the plurality of electrodes and the plurality of electrode terminals are connected to the plurality of metal wires by wire bonding. With this configuration, in the wire bonding, the wires can be connected at a minute center interval of, for example, about several tens to hundreds (μm). Therefore, in order to connect a large number of electrodes and electrode terminals to each other, a large number of wires and wire fixing members are used. Even in the case where the metal wires are integrally connected, the connection with the metal wire, that is, the connection wire can be made while ensuring the insulation between the electrodes and the electrode terminals.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the following description, dimensional ratios and the like of each part are not necessarily drawn accurately.

FIG. 1 is an exploded perspective view showing the structure of an FED (field emission display device) 10 which is an embodiment of the image display device of the present invention. In the figure, an FED 10 is disposed in parallel with each other so that respective one surfaces 12 and 14 face each other, and is provided between a front plate 16 and a back plate 18 having similar dimensions and shapes, and between the front plate 16 and the back plate 18. And a spacer 22 for forming an airtight space 20 by joining them at a predetermined interval. In this embodiment, the rear plate 18 corresponds to a first flat plate, and the front plate 16 corresponds to a second flat plate.

The front plate 16 and the back plate 18 are made of soda lime glass having a uniform thickness of about 1 to 2 (mm) and a light-transmitting softening point of about 600 (° C.). is there. The spacer 22 is, for example,
It has a rectangular frame shape having the same outer dimensions as the front plate 16 and the back plate 18. The spacer 22 is made of, for example, a rectangular frame-shaped 426 alloy having a uniform thickness of about 0.3 (mm) and a thickness of about 10 (μm) provided on its surface by electrodeposition or the like at 600 (° C.). It is covered with an insulating glass layer (not shown) made of borosilicate glass having a moderate softening point.
Therefore, the height of the airtight space 20 is, for example, about 0.3 (mm).

A transparent anode 24 made of, for example, ITO (Indium Tin Oxide) is provided on one surface 12 of the front plate 16 so as to cover the whole surface of the one surface 12. Are provided with phosphor layers 26 corresponding to three emission colors of R (red), G (green), and B (blue), respectively, for each section constituting one pixel. Therefore, as is apparent from the figure, in the present embodiment, the FED 10 has four pixels. The anode 24 is formed, for example, by a thin film method such as sputtering.
It is formed to a thickness of about 1 (μm) and has a relatively high conductivity with a sheet resistance of about 10 (Ω / □) or less. The phosphor layer 26 is made of, for example, ZnO: Zn,
ZnS: is composed of a material that emits visible light by an electron beam such as Ag + In ₂ O ₃ and is provided in a thickness of about 10 to 20 (μm) by a thick film screen printing method or the like, It has conductivity with a sheet resistivity of about 500 (Ω / cm ² ) or less.

The one surface 14 of the back plate 18 includes
A plurality of cathode electrodes 28 and a plurality of gate electrodes 30 are provided so as to be orthogonal and insulated from each other, and at the intersection thereof, a plurality of electron passage holes 32 are provided in the gate electrode 30. A plurality of emitters (cold cathodes) 34 are provided on the portion 28 corresponding to the electron passage holes 32. In this embodiment, the one surface 14 is provided on the inner surface of the first flat plate,
8 and the gate electrode 30 correspond to a plurality of electrodes, respectively.

The cathode electrode 28 is made of, for example, gold (A
The gate electrode 30 is made of a highly conductive metal such as u), and the gate electrode 30 is made of chromium (Cr) or the like. Also,
The emitter 34 is, for example, a conical cold cathode called a spindt type made of molybdenum (Mo) or the like.
Each of the plurality is formed at a uniform height of about 1 (μm). These are all provided by a thin film method such as sputtering, similarly to the anode 24. In addition, the above-mentioned electron passage hole 3
Numerals 2 each have a substantially circular shape having a diameter of about 1 to 2 (μm), and are formed by, for example, partially removing the gate electrode 30 by ion etching or the like. Although not shown in FIG.
An insulating film made of silicon dioxide (SiO ₂ ) or the like is provided so as to cover substantially the entire surface of the cathode electrode 28 except for the portion where the electrode 4 is formed, and the gate electrode 30 is formed on the insulating film. The cathode electrode 28 and the gate electrode 30 are insulated from each other. The gate electrode 30 is located closer to the front plate 16 than the tip of the emitter 34, and the distance between the gate electrode 30 and the surface of the phosphor layer 26 provided on the front plate 16 is, for example, 0.2 to 1 ( mm). In the figure, six electron passage holes 3 are formed at intersections of the cathode electrode 28 and the gate electrode 30 respectively.
2 and the emitter 34 are provided, but usually, for example, about 2000 more electron passage holes 32 and the emitter 34 are provided.

For this reason, when a predetermined signal voltage and a predetermined scanning voltage are applied to the cathode electrode 28 and the gate electrode 30, respectively, the emitter 34 is generated by a field emission caused by a large voltage gradient between them.
The electrons are emitted from. The electrons fly toward the anode 24 through the electron passage holes 32 when a predetermined positive voltage is applied to the anode 24 provided on the front plate 16. Thereby, electrons collide with the phosphor layer 26 provided on the anode 24, and the phosphor layer 26 emits light.

An exhaust hole 36 having a diameter of, for example, about 1 (mm) penetrating in the thickness direction is provided at a central portion of the back plate 18 so as not to interfere with the cathode electrode 28 and the gate electrode 30. In the exhaust hole 36, as shown in FIG. 1 and FIG. 2 showing the back plate 18 viewed from the back surface 38 side, the electrode connecting member 40 has both end surfaces 42, 42.
Are fixed to the one surface 14 and the back surface 38 by an inorganic binder 43 made of low softening point glass such as borosilicate glass. This electrode connecting member 40 is similar to that shown in FIG.
And a plurality of wires 44 integrated with an inorganic binder 46 such as borosilicate glass with the end faces exposed at both end faces 42, 42. is there. Note that the wires 44 are made of a conductive material such as gold or aluminum having a diameter of about 30 to 50 (μm), for example, and are electrically insulated from each other by the inorganic binder 46. In the figure, for convenience of explanation, four wires 4 are connected to the electrode connecting member 40.
4 are provided, but as will be described later, in practice, a large number of wires 44 of, for example, about 50 to 100 (wires) are insulated from each other with a center interval of 100 (μm) or more. It is equipped with. Therefore, in the present embodiment, the plurality of wires 44 are respectively connected to the plurality of connection lines, and the entire inorganic binder 46 is connected to the column-shaped wire fixing member that connects the plurality of connection lines in a state of being separated from each other. Equivalent,
The exhaust hole 36 also serves as a “through hole” in the claims. Although the exhaust hole 36 is substantially entirely closed by the electrode connecting member 40, the electrode connecting member 40 is fixed in the exhaust hole 36 by an inorganic adhesive 43 as shown in FIG. The agent 43 is not completely filled between them, and between the inner peripheral surface of the exhaust hole 36 and the outer peripheral surface of the electrode connecting member 40, that is, on the inner peripheral side of the exhaust hole 36,
A communication hole 47 that allows the one surface 14 of the back plate 18 to communicate with the back surface 38 is formed.

As shown in FIG. 2, the plurality of cathode electrodes 28 are formed on the back surface 38 of the back plate 18.
A plurality of back wirings 48 corresponding to each of the gate electrodes 30 are provided around the exhaust hole 36. The back wiring 48 is made of a conductive material such as gold or silver.
For example, it is formed to have a thickness of about 10 (μm) and a width of about 0.5 (mm) by a thick film screen printing method or the like. Each of the plurality of wires 44 provided on the electrode connecting member 48 is connected to each of the plurality of cathode electrodes 28 and the gate electrodes 30 by the plurality of wires 50 on one surface 14, while on the back surface 38. Are connected to each of the plurality of back wirings 48 by a plurality of wires 52. Each of the wires 50 and 52 is made of, for example, a conductive material such as gold or aluminum (Al), and has the same diameter as the wire 44 provided in the electrode connecting member 40. Thus, the plurality of cathode electrodes 2 provided on one surface 14 in the hermetic space 20 of the FED 10
8 and the gate electrode 30 are provided on the back surface 38 located outside the hermetic space 20 without passing through the side end surface of the back plate 18.
It is electrically connected to each of the rear wirings 48 provided above. An exhaust pipe 54 having an opening with a diameter larger than that of the exhaust hole 36 is hermetically fixed to the back surface 38 of the back plate 18 with an inorganic binder such as lead glass. The inside thereof is provided with a getter 56 (omitted in FIG. 2). In the figure, reference numeral 54 denotes an electrode terminal made of Fe-Ni-Cr or the like for supplying a current to the rear wiring 48, and is fixed in a state pressed against the rear wiring 48 by the exhaust pipe 52. Although the number of the electrode terminals 58 is provided corresponding to the number of the back wirings 48, only two are shown in the figure. In the present embodiment, the back wiring 48 or the back wiring 48 and the electrode terminals 58 correspond to “plurality of electrode terminals” in claims.

The FED 10 configured as described above is manufactured, for example, according to the process shown in FIG. In the figure, in the rod manufacturing step of step 1A and the cutting step of step 2A, the electrode connecting member 40 is connected to the front plate 16 and the back plate 1.
8 corresponds to an electrode connecting member manufacturing step for manufacturing separately, that is, a metal wire fixing step in which the wires 44 are connected to each other in a state of being separated from each other by a columnar electric wire fixing member (that is, an inorganic binder 46). That is, first, in step 1A, a rod-shaped electrode connecting member base material 60 (see FIG. 7) in which the columnar shape shown in FIG. 3 is extended in the axial direction is produced, and then, in step 2A, the electrode connection is formed. Member base material 6
0 is cut substantially perpendicularly to the axial direction as shown by a dashed line in FIG. 7 using a cutting tool such as a diamond cutter. The above-described electrode connecting member base material 6
0 is manufactured by a simple method, for example, as schematically shown in FIG.

In FIG. 6, a glass slurry 64 in which glass powder such as borosilicate glass is dissolved in an organic solvent such as alcohol is stored in a water tank 62, and an appropriate length of glass slurry 64 is stored in the glass slurry 64. A lower guide plate 70 having a plurality of reels 66 around which the wires 44 are wound and a number of guide holes 68 is submerged. The lower guide plate 70 is located above the reel 66 and the glass slurry 6
4 is fixed at a height where the whole is located. Aquarium 62
A large number of guide holes 7 are provided above the
The upper guide plate 74 provided with the second guide plate 2 is arranged in parallel with the lower guide plate 70. The wire 44 wound on the reel 66 is connected to the guide hole 68 of the lower guide plate 70.
Through the guide hole 72 of the upper guide plate 74, and the tip is fixed on the upper surface 76 thereof. The guide holes 68 and 72 are, for example, 100 (μm)
About 50 to 100 pieces are provided at the same position of the lower guide plate 70 and the upper guide plate 74 at the center interval of the order. In the figure, two reels 66 and two (wires) 4
4 are shown, but in reality, a number of reels 66 corresponding to the number of the guide holes 68, 72 are provided in the water tank 62,
The wires 44 pass through all the guide holes 68 and 72 and are fixed to the upper guide plate 74.

From the above arrangement, the upper guide plate 7
When the wire 4 is slowly moved upward as shown by the arrow in the figure while maintaining the parallel state with the lower guide plate 70, the plurality of wires 44 are pulled up with a center interval equal to the guide holes 68 and 72, and A glass slurry 64 is attached to each surface of the plurality of wires 44. That is, the glass slurry 64 is attached between the plurality of wires 44 and on the surface of the wire 44 located at the outermost periphery. The raised bundle of wires 44 is cut to an appropriate length and stretched in the axial direction, for example, 600 to
By performing heat treatment at a temperature of about 800 (° C.), a plurality of wires 44 as shown in FIG. 7 are bonded in a state where they are separated from each other (ie, insulated) by an inorganic binder 46 (borosilicate glass). Thus, a rod-shaped electrode connecting member base material 60 is obtained. At this time, the plurality of guide holes 68, 72
Are arranged so as to form a substantially circular shape,
Although the cross section perpendicular to the axial center direction of the electrode connecting member base material 60 and the electrode connecting member 40 is substantially circular, the cross section is not a perfect circular shape as shown in FIG.
4 has a shape with irregularities along the surface. Since the electrode connecting member 40 is formed by cutting the electrode connecting member base material 60 thus manufactured to an appropriate size, a plurality of wires are formed by a columnar wire fixing member (inorganic binder 46). 44 are connected to each other by an inorganic binder in a state where they are separated from each other.

Returning to FIG. 5, Steps 1B to 6 are processing steps of the back plate 18. First, in the through hole forming step of the step 1B, the exhaust holes 3 are formed in the back plate 18 by a drill or the like.
6 is perforated. Next, in a cathode forming step of step 2B, a conductive film made of gold or the like is formed on the one surface 14 of the back plate 18 provided with the exhaust holes 36 by, for example, a sputtering method and is patterned to form the cathode electrode 2.
8 is formed. In the gate forming step of the subsequent step 3, after forming an insulating film on the cathode electrode 28, a conductive film made of chromium or the like is formed on the insulating film in the same manner by sputtering or the like, and is patterned and etched or ionized. The conductive film is partially removed by etching or the like to form the gate electrode 30 having the electron passage holes 32. The patterning of the gate electrode may be performed after forming an emitter 34 described later. Then, in the emitter forming step of step 4, after the insulating film on the cathode electrode 28 is partially removed at the position where the electron passage holes 32 are formed, a molybdenum film is formed by a sputtering method or the like. As a result, a molybdenum film is formed on the cathode electrode 28 in the portion where the insulating film has been removed. However, the shape of the molybdenum film naturally forms a conical shape. It is done. Unnecessary molybdenum film formed on gate electrode 30 is removed thereafter.

After the electrodes 28 and the like are formed as described above, in the metal wire arranging step of step 5, ie, the electrode connecting member fixing step, the electrode connecting member 40 manufactured according to the steps 1A and 2A is attached to the back plate. Then, a low softening point glass such as lead glass is applied to the gap between the inner wall surface of the exhaust hole 36 and heat-treated at a temperature of, for example, about 500 (° C.) or more. As a result, the electrode connection member 40 is
Fixed inside. The electrode connection member 40 and the exhaust hole 36
The gap with the inner wall surface of the rear plate 18 is not completely filled, and has a cross-sectional area of about 10 to 70 (%) with respect to the cross-sectional area of the exhaust hole 36.
Is left. Thereafter, in a wire bonding step of Step 6 corresponding to the connecting step, both end surfaces 42 and 42 of the electrode connecting member 40 and the cathode electrode 28,
The wires 50 and 5 are connected to the gate electrode 30 and the back wiring 48.
2 are connected by wire bonding. Thereby, the back plate 18 shown in FIG. 1 is obtained.

Steps 1C and 2C are processing steps for the front plate 16. That is, in the anode forming step of step 1C, an anode 24 made of ITO is formed on one surface 12 by a thin film method such as sputtering, and in the phosphor layer forming step of step 2C, three kinds of phosphors corresponding to three colors of RGB are colored. The phosphor layer 26 is provided by applying a thick film screen printing method or the like to a predetermined position determined for each. In this way, the back plate 18 and the front plate 16 are each processed,
The spacer 22, the exhaust pipe 54, the getter 56, and the electrode terminal 58 are separately prepared, and these are combined with each other in the combination step of Step 7, as shown in FIG. Stack them face-to-face.
At this time, a sealing agent such as a not-shown seal glass made of lead glass is applied to the upper and lower end surfaces of the spacer 22 and the like. In the heating step 8, the heat treatment is performed at a temperature of, for example, about 470 to 500 (° C.) determined by the type of the sealing agent, so that the front plate 16 to the exhaust pipe 5 are heated.
4 are hermetically bonded. The processing temperature in the steps 1A and 5 is set so that the inorganic binder 46 constituting the electrode connecting member 40 is not softened during the heat treatment in the step 8 or the entire electrode connecting member 40 does not fall off the back plate 18. It is determined according to the type of the selected inorganic binder 46 and the low softening point glass. Thereafter, in the exhaust step of step 9, exhaust is performed from the exhaust pipe 54 through the communication hole 47 formed in the gap between the exhaust hole 36 and the electrode connecting member 40, and the inside of the hermetic space 20 is, for example, 5 × 10 ⁻⁷ (Tor
r) The FED 10 is obtained by fusing and sealing the end of the exhaust pipe 54 in a state where the degree of vacuum has reached about the degree of r).

According to the present embodiment, the FED 10 has an exhaust hole 36 penetrating through the back plate 18 in the thickness direction, and the one side 14 of the back plate 18 through the exhaust hole 36. Are provided to electrically connect each of the plurality of cathode electrodes 28 and the gate electrodes 30 provided to each of the plurality of back wirings 48 provided outside the hermetic space 20, and are mutually insulated from each other. A book wire 44 is provided. Therefore, the cathode electrode 28 and the like provided on one surface 14 of the back plate 18 are connected to the back wiring 48 by the wires 44 through the exhaust holes 36 provided in the back plate 18, so that the side end surface of the FED 10 There is no need to provide wiring for the connection. Therefore, an increase in the outer edge dimension caused by providing the connection wiring on the side end surface is suitably suppressed.

By the way, in a conventional image display device such as an FED, as shown schematically in FIG.
The connection wiring 82 for connecting the electrode provided in the hermetic space to the outside via the side end face 80 of the connector 8 was provided. However, in a large-sized image display device formed by arranging a plurality of such display elements, FIG.
(b) As shown in FIG.
It is necessary to provide a coating film 84 made of an insulating material such as glass in order to prevent a mutual short circuit and prevent deterioration of the connection wiring 82 due to a change with time. Therefore, since the outer edge dimension of the image display element is increased by the thickness of the coating film 84, the interval between the display elements is enlarged, the continuity of the image is reduced, and a high display quality cannot be obtained. was there. In the drawing, reference numeral 86 denotes a spacer, and 88 denotes a front plate. Further, in this figure, for convenience of explanation, the vertical relationship of the elements is shown opposite to that in FIG. 1 and the like, and the getters, exhaust pipes, and the like are omitted. In this embodiment as well, the anode 24 provided on the front plate 14 needs to be taken out to the back surface 38 via the side end surface of the FED 10, but the anode 24 can be connected to a plurality of FEDs 10 in common. Therefore, the problem of insulation failure cannot occur, and the problem of deterioration with time is unlikely to occur because the oxide film is made of a stable oxide film as compared with metal. It is.

In this embodiment, the FED 10
The column-shaped electric wire fixing member, that is, the inorganic binding agent 46 that couples the plurality of wires 44 in a state of being separated from each other, the state in which the plurality of wires 44 are joined, that is, the electrode connecting member 40 is fitted in the exhaust hole 36. The plurality of wires 44 are provided on the back plate 18 by being fixed. In this manner, the columnar electrode connecting member 40 formed by connecting the plurality of wires 44 in a state of being separated from each other is fitted into and fixed to the exhaust hole 36, so that the plurality of wires 44 are connected to the FED 10. Is provided. Therefore, since the plurality of wires 44 are mutually insulated in a state of the electrode connecting members 40 bonded by the inorganic binder 46, the occurrence of poor insulation therebetween is suppressed, and the FED 10 Reliability is improved. In the electrode connecting member 40, a plurality of wires 44
When the center distance between the two is about 100 (μm) or more, mutual insulation is sufficiently obtained. For example, when fitting into the exhaust hole 36 having a diameter of about 1 (mm), several tens to about one hundred wires are used. 44
Can be provided in the electrode connection member 40. Therefore, by increasing the number of wires 44 as much as possible, it is possible to use one kind of electrode connecting member 40 to cope with various kinds of image display elements. At this time, if the number of electrodes is smaller than the number of wires 44, no inconvenience will occur if the surplus wires 44 are allowed to play without being connected to the electrodes. Moreover, since the electrode connecting member 40 is formed by cutting the rod-shaped electrode connecting member base material 60 to an arbitrary size, it can correspond to an arbitrary thickness of the back plate 18.
It is easy to handle more types.

In this embodiment, the through hole in which the wire 44 is provided is the exhaust hole 36 provided for exhausting from the airtight space 20, and the electrode connecting member 40 is provided in the exhaust hole 36. In this state, a communication hole 47 is formed on the inner peripheral side of the exhaust hole 36 to allow the one surface 14 of the back plate 18 to communicate with the back surface 38. With this configuration, since the exhaust hole 36 always provided in the FED 10 including the airtight space 20 therein is used as a through hole,
Since a step of separately forming a through hole for providing the wire 44 is not required, an increase in the number of steps is suppressed, and a plurality of cathode electrodes 28 and the like provided on the one surface 14 of the back plate 18 are avoided. FED for the purpose of providing a through hole
It is suppressed that the design of 10 becomes complicated. Since the exhaust hole 36 is not completely closed, the airtight space 20
The exhaust from can be performed without any trouble.

In this embodiment, in the through hole forming step of step 1B, the exhaust hole 36 is provided in the back plate 18, while in the metal wire fixing step of steps 1A and 1B, ie, the electrode connecting member forming step, a plurality of holes are formed. By connecting the wires 44 integrally with each other in a state where they are insulated from each other by the inorganic binder 46, the columnar electrode connecting members 40 are manufactured, and the metal wire arranging step of Step 5 following them, that is, the electrode connection In the member fixing step, the electrode connecting member 40
Is fitted into the exhaust hole 36 and fixed. Further, in the wire bonding step of step 6, the electrode connecting member 4
The plurality of wires 44 are connected to each of the plurality of cathode electrodes 28 and the like and the plurality of back wirings 48 at both ends 42 of the zero. Therefore, the plurality of wires 44 are provided in the exhaust holes 36 by fitting and fixing the separately formed columnar electrode connecting members 40 in the exhaust holes 36 provided in the back plate 18. Since the cathode electrode 28 and the like and the back wiring 48 are connected to the wires 44 provided in the FED 10, there is no need to provide connection wiring on the side end surface, so that the outer edge dimension of the FED 10 can be suitably suppressed from increasing. In addition, according to the above-described manufacturing method, it is easy to ensure the mutual insulation of the wires 44, and at the same time, the wires 44 are provided, and
There is also an advantage that the step of connecting the P.8 and the P.8 is simplified.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the embodiment, the present invention
The case where the present invention is applied to D10 has been described. However, any image display device including an airtight space formed by a pair of flat plates and a plurality of electrodes for emitting light in the airtight space may be a PDP, The present invention is similarly applied to other image display elements such as VFD.

In the embodiment, a plurality of connection lines are provided by fitting the electrode connection member 40 integrated with the plurality of wires 44 in a state where the wires 44 are insulated from each other. However, for example, a plurality of coated wires each provided with an insulating coating may be inserted into the exhaust hole 36 and connected to the cathode electrode 28 or the like.

In the embodiment, the exhaust hole 36 is used as a through hole for passing the connection line. However, one or more through holes for the connection line may be provided separately from the exhaust hole 36. . In this case, if the through hole is hermetically closed in the completed state of the element, the position of the through hole is not limited to the position hermetically sealed by the exhaust pipe 54, but may be any position on the outer peripheral side. It can be provided. In the embodiment, in order to prevent the exhaust hole 36 from losing the exhaust function, the inorganic binder 43 is used to form the electrode connecting member 40 so that a communication hole 47 is formed between the electrode connecting member 40 and the exhaust hole 36. Is fixed, for example, the electrode connecting member 40 is substantially formed by wires 50 and 52 connecting the wire 44 to the cathode electrode 28, the gate electrode 30, and the back wiring 48.
In this case, it is not necessary to fix the electrode connecting member 40 with the inorganic binder 43, and a sufficiently large communication hole 47 is secured between the electrode connecting member 40 and the inner peripheral surface of the exhaust hole 36. If the electrode connecting member 40 itself is provided with a through-hole penetrating in the axial direction, and if the exhaust can be performed through the through-hole, the space between the electrode connecting member 40 and the exhaust hole 36 is completely made of the inorganic binder 43 or the like. May be closed.

In the embodiment, the electrode connecting member base material 60 is manufactured by pulling up the plurality of wires 44 from the inside of the glass slurry 64.
A molten glass may be used instead of 4. In addition, the viscosity of the glass slurry 64 and the molten glass, the pulling speed of the wire 44, and the like are appropriately set according to the center interval of the wire 44 and the like so that a columnar body can be suitably obtained.

In the embodiment, the cathode electrode 2
8 and two FEs each having two gate electrodes 30
Although the case where the present invention is applied to D10 has been described,
The present invention is similarly applied to a case where the number of electrodes is larger.
In such a case, if the cathode electrode 28 and the like and the wire 44 of the electrode connecting member 40 are connected by wire bonding as shown in the embodiment, they are connected to each other at a position separated from the one surface 14. Therefore, there is no particular possibility that the plurality of cathode electrodes 28 and gate electrodes 30 may be short-circuited to each other.

Further, between the phosphor layers 26 provided on the one surface 12 of the front plate 16, an insulating layer may be formed as necessary to provide a black mask.

Although not specifically exemplified, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an FED according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which a back plate of the FED of FIG. 1 is viewed from the back surface side.

FIG. 3 is a view showing an electrode connecting member used in the FED of FIG. 1;

FIG. 4 is an enlarged view showing a part of a back plate of the FED of FIG. 1;

FIG. 5 is a process diagram illustrating a manufacturing process of the FED of FIG. 1;

6 is a diagram illustrating an apparatus for manufacturing a base material for an electrode connecting member in step 1A of FIG.

FIG. 7 is a view showing an electrode connecting member base material manufactured by the apparatus of FIG. 5;

FIG. 8A is a perspective view schematically showing the entire conventional FED, and FIG. 8B is an enlarged view showing a boundary portion when a plurality of FEDs of FIG. .

[Explanation of symbols]

10: FED (image display element) 14: one surface (inner surface) 16: front plate (second flat plate) 18: rear plate (first flat plate) 20: airtight space {28: cathode electrode, 30: gate electrode} (multiple) 36: Through hole 40: Electrode connecting member 44: Wire (connection line) 48: Back wiring (plural electrode terminals)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 9/32 H01J 9/32 A 29/90 29/90 29/94 29/94 31/12 31/12 C

Claims (4)

[Claims] 1. A first flat plate and a second flat plate which are located at a predetermined distance from each other to form an airtight space therebetween, and an inner surface of the first flat plate for generating light emission in the airtight space. An image display element comprising: a plurality of electrodes provided thereon; and a plurality of electrode terminals provided outside the hermetic space and each of the plurality of electrodes is electrically connected. At least one through-hole provided through one flat plate in the thickness direction, and provided to electrically connect each of the plurality of electrodes to each of the plurality of electrode terminals through the one through-hole. And a plurality of connection lines insulated from each other. 2. A plurality of connection wires are fixed by being inserted into and fixed to the through-hole in a columnar wire fixing member that is connected to each other by an inorganic binder in a state where the plurality of connection wires are separated from each other. 2. The image display device according to claim 1, wherein the image display device is provided on the first flat plate. 3. The through hole is an exhaust hole provided to exhaust air from the hermetic space, and an inner peripheral side of the through hole when the plurality of connection lines are provided in the through hole. 2. The image display device according to claim 1, further comprising a communication hole for communicating the inner surface of the first flat plate with a back surface opposite to the inner surface. 4. A first flat plate and a second flat plate which are located at a predetermined distance from each other to form an airtight space therebetween, and an inner surface of the first flat plate for generating light emission in the airtight space. A method for manufacturing an image display element, comprising: a plurality of electrodes provided thereon; and a plurality of electrode terminals provided outside the hermetic space and each of the plurality of electrodes is electrically connected. A through hole forming step of providing a through hole in the first flat plate; a metal wire fixing step of joining a plurality of metal wires with an inorganic binder in a state of being separated from each other using a columnar wire fixing member; A metal wire arranging step of arranging the plurality of metal wires in the through hole by fitting and fixing an electric wire fixing member to which the metal wires are fixed in the through hole; At both ends of the wire fixing member, A method for manufacturing an image display element to the connecting step of connecting the respective of metal wires and said plurality of electrodes and the plurality of electrode terminals to each other, to include the features.