JP2003203559A - Method of manufacturing display device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently emit an electron by using a fibered material. <P>SOLUTION: A pressure sensitive adhesive sheet 10 is stuck to the outermost surface of an electron source layer 3 composed of a baked conductive filler 3A and a conductive fiber 3B. A fibered conductive material 3B' is torn off together with a conductive filler 3A' of the outermost surface by tearing off this sheet, and a conductive material 3B is raised up, so that the fibered conductive material 3B is exposed in an electric field in an implanted state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device utilizing electron emission into a vacuum, and more particularly, to manufacturing a display device having an electron source capable of stable electron emission to improve display characteristics. A method and a display device.

[0001]

2. Description of the Related Art Conventionally, a color cathode ray tube has been widely used as a display device excellent in high brightness and high definition. However, with the recent improvement in image quality of information processing devices and television broadcasting, it has characteristics of high brightness and high definition and is lightweight,
There is an increasing demand for space-saving flat panel displays.

As typical examples thereof, liquid crystal display devices, plasma display devices and the like have been put into practical use. In addition, in particular, a display device utilizing electron emission from an electron source to a vacuum (hereinafter, referred to as an electron emission display device or a field emission display device: FED) and a low consumption device, which can achieve high brightness, Practical application of various types of panel-type display devices such as organic EL displays characterized by electric power is near.

Among such panel type display devices, the field emission type display device includes C.I. A. Those having an electron emission structure proposed by Spindt et al., Those having a metal-insulator-metal (MIM) type electron emission structure, electron emission structures utilizing the electron emission phenomenon by the quantum tunnel effect (surface conduction type electrons). (Also called source), as well as diamond and graphite films,
A field emission type display device and the like utilizing the electron emission phenomenon of carbon nanotubes (CNT) are known.

FIG. 17 is a schematic cross-sectional view for explaining a constitutional example of the field emission display device, and FIG. 18 is an enlarged cross-sectional view of a portion indicated by an arrow A in FIG. Reference numeral 100 indicates a rear panel, 200 indicates a front panel, and 300 indicates a sealing frame. The rear panel 100 has a cathode electrode 2 having an electron source 3 and a control electrode 5 provided via an insulating layer 4 on the inner surface of the rear substrate 1. Further, the phosphor 7 and the anode 8 are formed on the inner surface of the front substrate 6 that constitutes the front panel 200.

The control electrode 5 is formed on the insulating layer 4 by vapor deposition of a conductive material or the like, and has a function of controlling electron emission (electron extraction) from the electron source 3 included in the cathode wiring 2. Further, another electrode for applying a potential for converging electrons to the phosphor 7 may be provided. Although the phosphor 7 is provided on the anode 8 in FIG. 17, the anode 8 may be formed by covering the phosphor 7. In addition, a light shielding layer (black matrix) is also provided between adjacent phosphors. The back panel 100 and the front panel 200 are attached to each other by a sealing frame 300 and vacuum sealed.

An electron source 3 is formed on the cathode wiring 2 provided on the rear panel 100. The electron source 3 is composed of an electron emitting material that efficiently generates electrons by an electric field applied between the cathode wiring 2 and the control electrode 5. A conductive material generally has a higher electron emission performance as the outer edge has a sharper shape. Therefore, highly efficient electron emission can be realized by using a fiber-shaped (rod-shaped) conductive material. There is so-called carbon nanotube (CNT) as one of the electron emitting materials. The carbon nanotubes are mixed with a conductive filler such as silver or nickel and fixed to the cathode wiring 2 to form the electron source 3. The emitted electrons are accelerated by the electric field applied between the cathode wiring 2 and the anode 8 to cause the phosphor 7 to emit light. The control electrode 5
It is also possible to emit an electron by applying an electric field by the anode 8 without providing.

[0007]

When a fibrous conductive material is used as an electron source, it is necessary to fix this conductive material on the cathode wiring 2. Here, carbon nanotubes will be described as an example of the fibrous conductive material.
A carbon nanotube is an extremely thin needle-like carbon compound (strictly speaking, a planar structure called graphene in which carbon atoms are arranged in a hexagonal shape is arranged in a cylindrical shape and closed, and is a hollow substance with a diameter of nanometer scale. Therefore, by arranging this on the cathode wiring 2 and using it as the electron source 3, efficient electron emission can be obtained.

When the carbon nanotubes are placed on the cathode wiring 2, an electrode paste prepared by kneading the carbon nanotubes with a conductive filler such as silver or nickel is applied to form an electron source layer, which is baked to form the cathode wiring. A method of fixing to 2 is known. However, when nickel is used as the conductive filler, in the electron source 3 formed by applying and firing the conductive filler, nickel particles that are the conductive filler are exposed on the outermost surface thereof, or carbon nanotubes are present on the surface of the nickel particles. The carbon nanotubes stick to each other, making it difficult for the sharp ends of the carbon nanotubes to be exposed in a vacuum. In addition, there is a case where part or all of the carbon nanotubes on the surface are burned out by the firing. As a result, the electron emission performance cannot be fully exhibited.

Conventionally, when the electron source 3 using nickel as a conductive filler is used, a method of exposing the carbon nanotubes to the polished surface of the electron source layer by polishing the surface after baking the coating film is adopted. It was Further, when silver is used as the conductive filler, if the amount of silver mixed is large, the silver will take in the carbon nanotubes in the firing step, and the carbon nanotubes will not function as the electron source 3. On the contrary, if the amount of silver mixed is small, the strength of the coating film cannot be obtained, and even if the amount of silver mixed is intermediate, polishing is required to expose the carbon nanotubes on the surface.

When the carbon nanotubes are exposed by the above-mentioned polishing, the exposed portion is such that the polished surface can be seen on the outermost surface of the electron source, and it is not possible to sufficiently expose the end portion for fulfilling the electron emission performance. Therefore, it is difficult to construct a sufficiently bright display device with highly efficient electron emission.

An object of the present invention is to provide a method of manufacturing a display device having an electron source capable of realizing efficient electron emission by using a fibrous material such as carbon nanotube, and a display device provided with this electron source. To do.

[0012]

In order to achieve the above-mentioned object, the production method of the present invention is such that an adhesive sheet is attached to the outermost surface of a fired electron source layer, and the adhesive sheet is peeled off to conduct the outermost surface. The feature is that the fibrous conductive material is exposed in an electric field in an upright state by causing the fibrous conductive material together with the conductive filler. still,
Instead of using the adhesive sheet, an adhesive layer made of a resin film or the like may be formed and then peeled off.

The display device of the present invention is characterized by providing a sufficiently bright display device by realizing highly efficient electron emission by being manufactured by the above manufacturing method. The typical constitution of the present invention is as follows.

First, regarding one manufacturing method of the display device,
An electron is emitted from the electron source by providing a rear panel having an electron source on the cathode wiring and a front panel having an anode and a phosphor facing the electron source, and applying an electric field to the electron source. In the method of manufacturing a display device for exciting the phosphor to display, an electrode paste applying step of applying an electrode paste containing a conductive filler and a conductive fiber on the cathode wiring, and the electrode paste. A step of forming an electron source layer by baking to form an electron source layer, and attaching an adhesive sheet to the surface of the electron source layer after firing or forming an adhesion layer, attaching the adhesive sheet or an adhesion layer A surface layer peeling step of causing the conductive fiber from the surface of the electron source layer by peeling with the surface layer of the electron source layer.

At least one of carbon nanotubes, graffiti fibers, and carbon nanohorns is used as the conductive fiber, and the conductive filler contains silver or nickel as a main component, or those. Is used as the main component.

By the manufacturing method including the above steps, the conductive fiber as the electron source rises from the electron source layer in the electric field to be exposed, and is fixed in a state of being implanted in the electron source layer. Therefore, the electron emission performance in an electric field is improved, and a bright display device can be obtained.

As another method of manufacturing the display device, an electron source provided on the cathode wiring and a control electrode electrically insulated from the electron source by an insulating layer and arranged in close proximity to each other are provided. And a front panel having a phosphor and an anode arranged to face the electron source, the electrons emitted from the electron source by applying an electric field to the electron source are the phosphor. A method of manufacturing a display device for exciting light to emit light, comprising: forming a cathode wiring on the inner surface of the back panel; and forming an insulating layer exposing at least a region where the electron source is formed. An insulating layer forming step, a control electrode forming step of forming a control electrode on a portion of the insulating layer facing the electron source, and a conductive filler and a conductive material in a region of the cathode wiring where the electron source is formed. An electrode paste applying step of applying an electrode paste containing fibers, a baking / electron source layer forming step of baking the electrode paste to form an electron source layer, and an adhesive sheet attached to the surface of the electron source layer after baking. Wearing or forming an adhesion layer, a surface layer peeling step of causing the conductive fiber from the surface of the electron source layer by peeling the adhesion layer or the adhesion layer together with the surface layer of the electron source layer, including.

At least one of carbon nanotubes, graffiti fibers, and carbon nanohorns is used as the conductive fiber, and the conductive filler contains silver or nickel as a main component, or those. Is used as the main component.

In this manufacturing method, an insulating layer is provided between the cathode wiring and the control electrode for electrical insulation, and the control electrode is formed on the insulating layer by means such as vapor deposition. Then, the cathode wiring is exposed in the openings formed in the insulating layer and the control electrode, the electrode paste is applied, and baked to form an electron source layer. A pressure-sensitive adhesive sheet is covered from above, and the pressure-sensitive adhesive sheet is attached to the surface layer of the electron source layer, and is peeled off together with the surface layer. Thereby, the conductive fiber as an electron source rises from the electron source layer in the electric field to be exposed, and is fixed in a state of being implanted in the electron source layer. Therefore, the electron emission performance in an electric field is improved, and a bright display device can be obtained. An adhesive layer may be used instead of the adhesive sheet.

Further, as another method of manufacturing the display device,
A rear panel having an electron source provided on the cathode wiring, a control electrode electrically insulated from the electron source, and arranged in close proximity to each other, and a fluorescent light arranged to face the electron source. A method of manufacturing a display device, comprising: a body and a front panel having an anode, wherein the phosphor is excited by the electrons emitted from the electron source to emit light by applying an electric field to the electron source. A cathode wiring forming step of forming the cathode wiring on the inner surface of the panel, an electrode paste applying step of applying an electrode paste containing a conductive filler and a conductive fiber in a region where the electron source is formed on the cathode wiring, A firing / electron source layer forming step of firing the electrode paste to form an electron source layer, and attaching an adhesive sheet or forming an adhesive layer on the surface of the electron source layer after firing, and attaching the adhesive sheet Shi Is a surface layer peeling step in which the conductive fiber is peeled from the surface of the electron source layer by peeling the adhesion layer together with the surface layer of the electron source layer, and the control electrode is formed by intersecting the cathode wiring and installing the control electrode. And a step.

At least one of carbon nanotubes, graffiti fibers, and carbon nanohorns is used as the conductive fiber, and the conductive filler contains silver or nickel as a main component, or those. Is used as the main component.

In this manufacturing method, it is not essential to provide an insulating layer between the cathode wiring and the control electrode. That is, a thin plate-like member is used as the control electrode, and its self-shape retention property is utilized, or tension is applied to electrically insulate it from the cathode wiring. Therefore, in this manufacturing method, the electrode paste is applied onto the cathode wiring and fired to form the electron source layer. A pressure-sensitive adhesive sheet is covered from above, and the pressure-sensitive adhesive sheet is attached to the surface layer of the electron source layer, and is peeled off together with the surface layer. After that, the above-mentioned control electrodes are installed. According to this,
The conductive fiber as an electron source rises from the electron source layer in the electric field to be exposed, and is fixed in a state of being implanted in the electron source layer. Therefore, the electron emission performance in an electric field is improved, and a bright display device can be obtained. An adhesive layer may be used instead of the adhesive sheet.

The structure of the display device according to the present invention includes an electron source provided on the cathode wiring and a control electrode electrically insulated from the electron source and arranged in close proximity to each other. A back panel and a front panel having a phosphor facing the electron source and an anode are provided, and by applying an electric field to the electron source, electrons emitted from the electron source excite the phosphor to emit light. In the display device, the electron source is a mixed layer of a conductive filler and a conductive fiber, the conductive fiber has a portion that is caused to be exposed from the conductive filler to the front panel side, At least a part of the exposed end of the conductive fiber that has been caused has an irregular sharp shape due to tearing.

At least one of carbon nanotubes, graffiti fibers, and carbon nanohorns is used as the conductive fiber, and the conductive filler contains silver or nickel as a main component, or those. Is used as the main component.

In this structure, a part of the tip of the conductive fiber having a portion exposed from the conductive filler toward the front panel side is peeled off at the time of peeling the pressure-sensitive adhesive sheet or the adhesion layer in the above manufacturing method. There is a tear between the surface layer and the electron source layer. The amorphous sharp shape formed by such tearing off significantly improves the electron emission performance, and thus a bright display device can be obtained.

It is needless to say that the present invention is not limited to the above-mentioned constitutions and constitutions of embodiments to be described later, and various modifications can be made without departing from the technical idea of the present invention.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings of the embodiments. 1 to 4 are schematic diagrams for explaining the main steps of an embodiment of the method for manufacturing a display device according to the present invention. 1 is a cross-sectional view showing a state in which an adhesive sheet is attached to an electron source layer obtained by firing an electrode paste, and FIG. 2 is an enlarged view of the electron source layer in FIG. Also, FIG.
Is a cross-sectional view showing a state in which the uppermost layer of the electron source layer is peeled off together with the adhesive sheet attached to the electron source layer, and FIG. 4 is a cross-sectional view showing a state of the conductive fiber caused by peeling the adhesive sheet.

As shown in FIG. 1, the cathode wiring 2 formed on the inner surface of the rear substrate 1 of the display device is exposed in the opening 4A formed in the insulating layer 4. The electron source layer 3 is provided on the cathode wiring 2. The electron source layer 3 is formed with a mixed layer of nickel particles 3A as a conductive filler and carbon nanotubes (hereinafter also referred to as CNT) 3B as a conductive fiber.

The electron source layer 3 is formed by applying an electrode paste obtained by kneading the above-mentioned nickel particles 3A and carbon nanotubes 3B with an appropriate dispersant (eg, ethyl cellulose) by printing or the like, and then firing. Nickel particles 3A and carbon nanotubes 3 in the electron source layer 3
As shown in the enlarged view of FIG. 2, B means that the ultrafine carbon nanotubes 3B are embedded between the nickel particles 3A or attached to the surfaces of the nickel particles 3A. Therefore, as it is, the carbon nanotubes 3B are hardly exposed from the surface of the electron source layer 3, and the electron emission performance of the carbon nanotubes cannot be exhibited.

Therefore, in this embodiment, as shown in FIG. 1, an adhesive sheet member 10 (hereinafter referred to as an adhesive sheet) such as an adhesive tape or an adhesive film is attached to the uppermost layer of the electron source layer 3 after firing. The adhesive sheet 10 is peeled off as indicated by the arrow in FIG. Since the lower layer of the electron source layer 3 after firing is fixed to the cathode wiring 2, some nickel particles 3A ′ in the uppermost layer are peeled off together with the carbon nanotubes 3B ′ in the vicinity of the surface by peeling off the adhesive sheet 10. Be done. At this time, the carbon nanotubes 3B remaining on the electron source layer 3 are pulled in the substantially peeling direction (front panel side) of the adhesive sheet 10 by the peeling operation of the adhesive sheet 10 and forcibly torn off.

As a result, as shown enlarged in FIG.
The carbon nanotubes 3B are formed from the nickel particles 3A as if they were the nickel particles 3A (that is, the electron source layer 3).
The tip is exposed as if it had been planted in, and is formed as an indeterminate sharp shape due to tearing in the electric field applied to the front panel. By exposing the sharp tip of the carbon nanotube 3B to the electric field in this manner, the electron emission performance originally possessed by the carbon nanotube 3B can be sufficiently exhibited.

FIG. 5 is a process chart for explaining the main process of one embodiment of the method for manufacturing a display device according to the present invention. Figure 5
The process will be described with reference to FIGS. First, the glass plate 1 for the rear panel (corresponding to the rear substrate 1 in FIGS. 1 and 3)
Is prepared and annealed to remove residual stress (process 1: hereinafter referred to as P-1). The cathode wiring 2 is formed on one surface of the annealed glass plate 1 (which will be the inner surface of the display device) (P-2). Cathode wiring 2
Are arranged in parallel on the surface of the glass plate 1 by printing with silver paste or the like, firing, or the like.

Next, an insulating material is applied or vapor-deposited on the cathode wiring 2 to form an insulating layer 4 (P-3), and a thin layer of an appropriate conductive material is further formed thereon to form the cathode wiring 2. An opening (4A) is formed in the control electrode 5 and the insulating layer 4 by a patterning method such as a photolithography technique in at least a portion corresponding to a pixel, that is, a portion where an electron source is provided (P-4). As a result, the cathode wiring 2 is exposed at the portion where the electron source layer 3 is provided.

An electrode paste prepared by kneading carbon nanotubes (CNT) into nickel is applied to the opening 4A by, for example, printing (P-5). In this case, the electrode paste has a thickness such that the surface of the electron source layer 3 formed after firing is in the vicinity of the opening edge of the opening 4A in consideration of shrinkage due to firing in the latter stage. Then, it is baked at 350 ° C to 600 ° C to obtain the electron source layer 3 (P-6).

The adhesive sheet 10 is attached to the surface of the electron source layer 3 fixed to the cathode wiring 2 by firing (P-7). The adhesive sheet 10 also adheres to the nickel particles 3A in the uppermost layer of the electron source layer 3 existing in the openings 4A, a part of the carbon nanotubes 3B, and a part of the carbon nanotubes 3B attached to the nickel particles 3A. After sticking the pressure-sensitive adhesive sheet 10, the pressure-sensitive adhesive sheet 10 is peeled off as shown in FIG. 3 (P-7). By this peeling, the nickel particles 3A and the carbon nanotubes 3B in the uppermost layer are partly peeled off.

At least a part of most of the carbon nanotubes 3B is fixed to the uppermost nickel particles, and the other part is fixed to the lower nickel particles (most of the electron source layer 3). Therefore, when the nickel particles in the uppermost layer are peeled off, the carbon nanotubes 3B partially adhered to the nickel particles and the other part adhered to the nickel particles in the lower layer are torn off to form an indeterminate sharp tip shape. The back panel is obtained by holding the electron source layer 3 on the surface of the electron source layer 3 (P-8). At this time, the adhesive sheet 10 covers the control electrode 5 as well, but since the control electrode 5 is a metal thin film having a substantially smooth surface, the control electrode 5 is not peeled off by peeling.

On the other hand, a glass plate to be the front panel is prepared, and the inner surface of this glass plate (the surface facing the flat panel)
An anode and a phosphor are formed on the substrate to form a front panel. The front panel and the back panel described above are bonded together and vacuum-sealed (P-9) to manufacture a field emission display device.

FIG. 6 is a schematic diagram for explaining the structure of one pixel in one embodiment of the display device according to the present invention. FIG. 3A is a plan view of the rear panel as seen from the front panel side, and FIG. 3B is a sectional view taken along the line DD ′ of FIG.
In the figure, the same reference numerals as those in FIGS. 1 to 4 correspond to the same functional portions. In FIG. 6, the cathode wiring 2 extending in the y direction
And one pixel is formed at the intersection of the control electrodes 3 extending in the x direction. The back panel 100 has a cathode wiring 2 formed on the inner surface of the back substrate 1, an electron source layer 3 formed on the cathode wiring 2, an insulating layer 4, and a control electrode 5. On the other hand, the front panel 200 has a front substrate (front glass plate) 6, a phosphor 7 partitioned by a black matrix 7A, and an anode 8.

Electron source layer 3 formed by the above manufacturing method
Generate electrons (indicated by circled e in the figure) from the carbon nanotubes 3B exposed above the cathode wiring 2. The electrons excite the phosphor 7 to develop a color depending on the phosphor. In the case of color display, one pixel in FIG. 6 is arranged as one color pixel by a pixel trio corresponding to the three primary colors. According to this example, the electron emission performance of the carbon nanotubes is sufficiently exhibited, and a display device having a bright display screen can be obtained.

7 to 10 are schematic views for explaining the main steps of another embodiment of the method for manufacturing a display device according to the present invention. 7 is a cross-sectional view showing a state in which an adhesive sheet is attached to the electron source layer obtained by firing the electrode paste, and FIG. 8 is an enlarged view of the electron source layer in FIG. Further, FIG. 9 is a sectional view showing a state in which the uppermost layer of the electron source layer is peeled off together with the adhesive sheet attached to the electron source layer, and FIG. 10 is a sectional view showing a state of the conductive fiber caused by the peeling of the adhesive sheet. Is.

In this embodiment, as shown in FIG. 7, an electron source layer 3 similar to the above-mentioned embodiments is provided on the cathode wiring 2 formed on the inner surface of the back substrate 1 of the display device. The cathode wiring 2 is formed on the rear substrate 1 by printing or the like, and the insulating layer 4 as shown in FIG. 1 is not provided between adjacent cathode wirings 2. As shown in the enlarged view of FIG. 8, the nickel particles 3A and the carbon nanotubes 3B in the electron source layer 3 have extremely fine carbon nanotubes 3B embedded between the nickel particles 3A or attached to the surface of the nickel particles 3A. It is in a state. Therefore, as it is, the carbon nanotubes 3B are hardly exposed from the surface of the electron source layer 3, and the electron emission performance of the carbon nanotubes cannot be exhibited.

In this embodiment, as shown in FIG. 7, an adhesive sheet 10 such as an adhesive tape or an adhesive film is attached to the uppermost layer of the electron source layer 3 after firing, and as shown by the arrow in FIG. The adhesive sheet 10 is peeled off. Since the lower layer of the electron source layer 3 after firing is fixed to the cathode wiring 2,
By peeling off the adhesive sheet 10, some nickel particles 3A ′ in the uppermost layer are peeled off together with the carbon nanotubes 3B ′ near the surface. At this time, the electron source layer 3
Carbon nanotubes 3B remaining on the adhesive sheet 1
With a peeling operation of 0, the adhesive sheet 10 is pulled in the substantially peeling direction (front panel side) and forcibly torn off.

As a result, as shown in an enlarged view in FIG. 10, the carbon nanotubes 3B have their tips exposed from the nickel particles 3A as if they were erected in the nickel particles 3A (ie, the electron source layer 3). It is formed as an indeterminate sharp shape due to tearing in the electric field applied between the panel and the panel. By exposing the sharp tip of the carbon nanotube 3B to the electric field in this manner, the electron emission performance originally possessed by the carbon nanotube can be sufficiently exhibited.

FIG. 11 is a process chart for explaining the main process of another embodiment of the method for manufacturing a display device according to the present invention.
The process of FIG. 11 will be described with reference to FIGS. First, a glass plate 1 for a rear panel (corresponding to the rear substrate 1 in FIGS. 7 and 8) is prepared and annealed to remove residual stress (P-10). The cathode wiring 2 is formed on one surface (inner surface of the display device) of the annealed glass plate 1 (P-20). A plurality of cathode wirings 2 are arranged in parallel on the surface of the glass plate 1 by printing with silver paste or the like, firing, or the like.

Next, an electrode paste prepared by kneading carbon nanotubes (CNT) with nickel in an appropriate dispersant is applied onto the cathode wiring 2 (P-30). Then 350 °
The electron source layer 3 is obtained by firing at C to 600 ° C. (P-4
0). The pressure-sensitive adhesive sheet 10 is attached to the surface of the electron source layer 3 fixed to the cathode wiring 2 by firing and peeled off as shown in FIG. 9 (P-50). By this peeling, the nickel particles 3A and the carbon nanotubes 3B in the uppermost layer are partly peeled off.

At least a part of most of the carbon nanotubes 3B is fixed to the uppermost nickel particles, and the other part is fixed to the lower nickel particles (most of the electron source layer 3). Therefore, when the nickel particles in the uppermost layer are peeled off, the carbon nanotubes 3B partially adhered to the nickel particles and the other part adhered to the nickel particles in the lower layer are torn off to form an indeterminate sharp tip shape. The back panel is obtained by holding it on the surface of the electron source layer 3 (P-60). After that, for example, a metal thin plate is processed by etching or the like, and the control electrode 5 of a plate member prepared as a separate member is set (P-70).

On the other hand, a glass plate to be the front panel is prepared, and the inner surface of this glass plate (the surface facing the flat panel)
An anode and a phosphor are formed on the substrate to form a front panel. The front panel and the back panel described above are bonded together and vacuum-sealed (P-80) to manufacture a field emission display device.

FIG. 12 is a schematic view for explaining the structure of one pixel in another embodiment of the display device according to the present invention. 9A is a plan view, and FIG. 9B is a cross-sectional view taken along line DD ′ of FIG. In the figure, the same reference numerals as those in FIGS. 7 to 10 correspond to the same functional parts. In FIG. 12, one pixel is formed at the intersection of the cathode wiring 2 extending in the y direction and the control electrode 5 extending in the x direction. The back panel 100 has a cathode wiring 2 formed on the inner surface of the back substrate 1, an electron source layer 3 formed on the cathode wiring 2, and a control electrode 5 insulated from the cathode wiring 2. On the other hand, the front panel 200 includes a front substrate (front glass plate) 6 and a black matrix 7A.
It has a phosphor 7 and an anode 8 partitioned by.

Electron source layer 3 formed by the above manufacturing method
Generate electrons (indicated by circled e in the figure) from the carbon nanotubes 3B exposed above the cathode wiring 2 by applying an electric field. The electrons excite the phosphor 7 to develop a color depending on the phosphor 7. In the case of color display, one pixel in FIG. 6 is arranged as one color pixel by a pixel trio corresponding to the three primary colors. According to this example, the electron emission performance of the carbon nanotube 3B is sufficiently exhibited,
A display device with a bright display screen can be obtained.

FIG. 13 is an equivalent circuit for explaining the driving method of the display device according to the present invention. In this display device, n cathode wirings 2 extending in the y direction are arranged in parallel in the x direction.
In addition, m control electrodes 5 extending in the x direction are arranged in parallel in the y direction to form a matrix of m rows × n columns together with the cathode wiring 2.

A scanning circuit 60 and a video signal circuit 50 are arranged around the rear panel which constitutes this display device. Each of the control electrodes 5 is connected to the scanning circuit 60 by control electrode terminals 40 (Y1, Y2, ..., Ym). The video signal circuit 5 is provided on each of the cathode wirings 2.
0 to the cathode terminal 20 (X1, X2, ... Xn).

The electron source layer 3 described in the above embodiment is provided for each pixel at the intersection of the cathode wiring 2 and the control electrode 5 arranged in a matrix. In each of the above embodiments, the number of electron source layers 3 is one per pixel at each intersection, but the number of electron source layers 3 is not limited to this and two or more electron source layers 3 can be arranged in one pixel region. R, G, and B in the figure are single-color pixels of red (R), green (G), and blue (B) that form one color pixel, respectively, and emit light corresponding to each color from the phosphor 7. To do.

Various signals for display are applied to the scanning circuit 60 and the video signal circuit 50 from a host computer (not shown). A sync signal 61 is input to the scanning circuit 60. The scanning circuit 60 selects a row of the matrix of the control electrode 5 via the control electrode terminal 61 and applies a scanning signal voltage.

On the other hand, the video signal 51 is supplied to the video signal circuit 50.
Is entered. The video signal circuit 50 has a cathode terminal 20 (X
1, X2, ..., Xn) are connected to the cathode wiring 2 and a column of the matrix is selected to apply a voltage according to the video signal 51 to the selected cathode wiring 2. As a result, the predetermined pixels sequentially selected by the control electrode 5 and the cathode wiring 2 emit light with predetermined color light to display a two-dimensional image.

Carbon nanotube 3B according to this embodiment
With the display device using the electron source as the electron source, a bright flat panel display device having a relatively low voltage and high efficiency can be realized.

FIG. 14 is a plan view showing the appearance of the display device of the present invention. In this display device, a back panel 100 and a front panel 200 are bonded together with a sealing frame 300, and a sealing frame 30 is formed.
A display area AR is formed inside 0. Reference numeral 500 is a back panel 100, a front panel 200, and a sealing frame 30.
The numeral 0 indicates an exhaust pipe for drawing a vacuum to the inside, which is normally arranged outside the display area AR.

15A and 15B are explanatory views of a specific example of the configuration of the display device shown in FIG. 14, FIG. 15A is a developed perspective view, and FIG. 15B is a sectional structural view. As described above, the cathode wiring 2 is formed on the inner surface of the rear panel 100, and the cathode terminal 20 is extended to one side of the rear substrate 1.
A control electrode 5 is formed on the cathode wiring 2 via an insulating layer 4 and intersects the cathode wiring 2. The control electrode terminal 40 drawn from the control electrode 5 is drawn to the other side of the rear substrate 1. This display device is shown in FIGS.
This corresponds to the embodiment of the present invention described in the above.

A gap holding member for holding the gap between the back panel and the front panel can be provided in such a display device. FIG. 16 is a schematic diagram illustrating an arrangement example of the gap holding members provided in the display device. In the figure, reference numeral 400 indicates a gap maintaining member, and the rear panel 100 is shown.
It is installed in the display area AR between the front panel 200 and the front panel 200. An insulating material is used for the partition member 400, but a conductive portion may be partially formed.

Modifications of each embodiment of the present invention will be described below. In each of the examples described so far, the conductive filler 3
Although nickel particles containing nickel as a main component were used as A, the present invention is not limited to this. For example, those containing silver as a main component, or those containing a mixture of silver and nickel as a main component, other than nickel. May be used. The conductive filler 3A used in the present invention includes, for example, B, P, Pb.
It is possible to use a material containing a small amount of the like. In the present specification, the expression "comprising a main component" means that it may or may not contain these trace amounts of additives.

As the conductive fiber 3B, a carbon-based electron emitting material is desirable. Examples of the carbon-based conductive fiber 3B include carbon nanotubes, graphite fibers, and carbon nanohorns, and those containing at least one of these can be used. However, as long as it has an elongated shape, it is not limited to the carbon type and can be applied.

Further, instead of using the adhesive sheet 10,
It is also possible to cover the electron source layer 3 and form an adhesion layer of, for example, a resin and peel off the adhesion layer. In this case, it is not adhesive, but it has an effect similar to that when the adhesive sheet 10 is used. As a method for forming the adhesion layer,
For example, there is a method of applying a resin liquid or the like and drying. When applying, it may be applied by spraying.

The sticking of the pressure-sensitive adhesive sheet 10 or the formation of the adhesion layer and the peeling of these are carried out after the firing of the electron source layer 3. As a result, even if all or part of the conductive fiber 3B on the surface of the electron source layer 3 is burnt out in the firing step, the surface is peeled off to expose the conductive fiber 3B that has not been burned off. Since the conductive fiber 3B can be erected by such physical force, the electron emission characteristics can be greatly improved.

By tearing off the conductive fiber 3B, an amorphous sharp shape is formed and the electron emission characteristic is improved.
This does not require that all conductive fibers 3B be torn off. This is because the electron emission characteristics are improved by just standing the conductive fiber 3B. Therefore, although the electron emission characteristic is somewhat inferior, the conductive fiber 3B may be simply stood up without tearing, or at least a part of the conductive fiber 3B may be torn off. Although glass plates are used for the back substrate 1 and the front substrate 6, other materials may be used. Note that these modified examples are merely examples, and various modifications can be made without departing from the technical idea of the present invention.

[0064]

As described above, according to the present invention,
A bright display device that realizes highly efficient electron emission characteristics is provided by exposing the end portion of a carbon nanotube to an electric field and imparting an amorphous sharp tip to at least a part of the carbon nanotube. be able to.

[0065]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where an adhesive sheet is attached to an electron source layer obtained by firing an electrode paste.

FIG. 2 is an enlarged view of an electron source layer of FIG.

FIG. 3 is a cross-sectional view showing a state in which the uppermost layer of the electron source layer is peeled off together with the adhesive sheet attached to the electron source layer.

FIG. 4 is a cross-sectional view showing a state of a conductive fiber caused by peeling of an adhesive sheet.

FIG. 5 is a process diagram illustrating a main process of an embodiment of a method for manufacturing a display device according to the present invention.

FIG. 6 is a schematic diagram illustrating the structure of one pixel in one embodiment of the display device according to the present invention.

FIG. 7 is a cross-sectional view showing a state in which an adhesive sheet is attached to an electron source layer obtained by firing an electrode paste.

FIG. 8 is an enlarged view of the electron source layer of FIG.

FIG. 9 is a cross-sectional view showing a state in which the uppermost layer of the electron source layer is peeled off together with the adhesive sheet attached to the electron source layer.

FIG. 10 is a cross-sectional view showing a state of a conductive fiber caused by peeling of an adhesive sheet.

FIG. 11 is a process chart for explaining a main process of another embodiment of the method for manufacturing the display device according to the present invention.

FIG. 12 is a schematic diagram illustrating the structure of one pixel in another embodiment of the display device according to the present invention.

FIG. 13 is an equivalent circuit illustrating a driving method of a display device according to the present invention.

FIG. 14 is a plan view showing the outer appearance of the display device of the present invention.

15 is an explanatory diagram of a specific example of the configuration of the display device shown in FIG.

FIG. 16 is a schematic diagram illustrating an arrangement example of a gap holding member provided in a display device.

FIG. 17 is a schematic cross-sectional view illustrating a configuration example of a field emission display device.

FIG. 18 is an enlarged sectional view of a portion indicated by an arrow A in FIG.

[Explanation of symbols]

100 rear panel 200 front panel 300 sealing frame 400 Gap holding member 1 Back substrate 2 cathode wiring 3 Electron source layer 3A conductive filler 3B conductive fiber 4 insulating layers 4A opening 5 control electrodes 6 Front substrate 7 Phosphor 7A light-shielding film 8 Anode.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuichi Kijima             Hitachi, Ltd. 3300 Hayano, Mobara-shi, Chiba             Factory Display Group (72) Inventor Susumu Sasaki             Hitachi, Ltd. 3300 Hayano, Mobara-shi, Chiba             Factory Display Group (72) Inventor Hiroshi Kawasaki             Hitachi Device, 3681 Hayano, Mobara-shi, Chiba             Engineering Co., Ltd. (72) Inventor Kenji Miyata             Hitachi, Ltd. 3300 Hayano, Mobara-shi, Chiba             Factory Display Group F term (reference) 5C036 EE14 EF01 EF06 EF09 EG12                       EH08 EH26

Claims (10)

[Claims] 1. A back panel having an electron source arranged on a cathode wiring, and a front panel having an anode and a phosphor facing the electron source, the electron source by applying an electric field to the electron source. A method of manufacturing a display device for exciting and displaying the phosphor by electrons emitted from, wherein an electrode paste applying step of applying an electrode paste containing a conductive filler and a conductive fiber on the cathode wiring. A firing / electron source layer forming step of firing the electrode paste to form an electron source layer, and attaching an adhesive sheet or forming an adhesive layer on the surface of the electron source layer after firing, the adhesive sheet or the And a surface layer peeling step of causing the conductive fiber from the surface of the electron source layer by peeling the adhesion layer together with the surface layer of the electron source layer. 2. The method for manufacturing a display device according to claim 1, wherein the conductive fiber includes at least one of carbon nanotube, graphite fiber, and carbon nanohorn. 3. The method for manufacturing a display device according to claim 1, wherein the conductive filler contains silver or nickel as a main component, or a mixture thereof. 4. A back panel having an electron source provided on the cathode wiring and a control electrode electrically insulated from the electron source by an insulating layer and arranged in close proximity to each other, and the electron source. A front panel having a phosphor and an anode arranged opposite to each other, wherein electrons emitted from the electron source excite the phosphor to emit light by applying an electric field to the electron source. A manufacturing method, wherein a cathode wiring forming step of forming the cathode wiring on the inner surface of the back panel, an insulating layer forming step of forming an insulating layer exposing at least a region where the electron source is formed, and the insulating layer And a control electrode forming step of forming a control electrode on a portion facing the electron source, and an electrode paste in which a conductive filler and a conductive fiber are mixed in a region where the electron source is formed on the cathode wiring. Electrode paste application step of applying, firing and electron source layer forming step of firing the electrode paste to form an electron source layer, and sticking an adhesive sheet or forming an adhesion layer on the surface of the electron source layer after firing Then, a surface layer peeling step of causing the conductive fiber from the surface of the electron source layer by peeling the adhesive sheet or the adhesive layer together with the surface layer of the electron source layer, Production method. 5. A rear panel having an electron source provided on the cathode wiring and a control electrode electrically insulated from the electron source and arranged in close proximity to each other, and a rear panel facing the electron source. A front panel having a phosphor and an anode that are arranged as an electron source, and a method for manufacturing a display device in which the phosphor is excited by light emitted from the electron source by applying an electric field to the phosphor to emit light. There is a cathode wiring forming step of forming the cathode wiring on the inner surface of the back panel, and an electrode for applying an electrode paste in which a conductive filler and a conductive fiber are mixed in a region where the electron source is formed on the cathode wiring. A paste application step, a firing / electron source layer formation step of firing the electrode paste to form an electron source layer, and a pressure-sensitive adhesive sheet is attached to the surface of the electron source layer after firing or an adhesion layer is formed, Stickiness A surface layer peeling step of causing the conductive fiber from the surface of the electron source layer by peeling the sheet or the adhesion layer together with the surface layer of the electron source layer, and a control for setting the control electrode intersecting with the cathode wiring. A method of manufacturing a display device, comprising: an electrode forming step. 6. The method of manufacturing a display device according to claim 4, wherein the conductive fiber includes at least one of carbon nanotube, graffiti fiber, and carbon nanohorn. 7. The display device according to claim 4, wherein the conductive filler contains silver or nickel as a main component, or a mixture thereof. Production method. 8. A rear panel having an electron source provided on the cathode wiring and a control electrode electrically insulated from the electron source and arranged in close proximity to each other, and facing the electron source. A display device comprising: a phosphor and a front panel having an anode, wherein the phosphor emits light by exciting the phosphor with electrons emitted from the electron source by applying an electric field to the electron source. , A mixed layer of a conductive filler and a conductive fiber, the conductive fiber has a portion that is exposed to the front panel side from the conductive filler, of the conductive fiber caused A display device, wherein at least a part of the exposed end has an indeterminate sharpened shape due to tearing. 9. The display device according to claim 8, wherein the conductive fiber includes at least one of carbon nanotubes, graffiti fibers, and carbon nanohorns. 10. The display device according to claim 8, wherein the conductive filler contains silver or nickel as a main component, or a mixture thereof.