JP2005093125A - Image display device and manufacturing method thereof - Google Patents

Abstract

【Task】
In a display device including an acceleration electrode and a control electrode and having a spacing member in a display region, the electron passage holes of the acceleration electrode and the control electrode are self-aligned to easily realize a large display image.
[Solution]
The conductive mesh substrate 181 is used as the acceleration electrode 18, and the opening of the mesh substrate 181 is used as the electron passage hole 18 a of the acceleration electrode 18, and the control electrode 17 is interposed on one side of the mesh substrate 181 via the insulating layer 19. And an opening 19a in the insulating layer 19 coaxially with the electron passage hole 18a of the acceleration electrode 18, and an electron passage hole 17a in the control electrode 17 respectively.
[Selection] Figure 3

Description

  The present invention relates to an image display device using electron emission into a vacuum, and in particular, a control electrode and an acceleration electrode that control the amount of electron emission emitted from an electron source are formed with high accuracy to achieve a stable electron emission amount. The present invention relates to an image display device that can be controlled and has improved display characteristics.

  In recent years, a color cathode ray tube has been widely used as an image display device excellent in high luminance and high definition. However, with the recent improvement in image quality of information processing apparatuses and television broadcasting, there is an increasing demand for flat display (panel display) that has high luminance and high definition characteristics and is light and space-saving.

  As typical examples, liquid crystal display devices, plasma display devices and the like have been put into practical use. In particular, high brightness can be achieved by a display device using electron emission from an electron source into a vacuum (hereinafter referred to as an electron emission display device or a field emission display device) or low power consumption. Various types of panel-type display devices such as organic EL displays that are characterized by being made into practical use have been put into practical use.

  Among the panel type display devices of this type, the above-described field emission display device includes C.I. A. One having an electron emission structure invented by Spindt et al. (See, for example, US Pat. No. 3,453,478, Japanese Patent Laid-Open No. 2000-21305), or having a metal-insulator-metal (MIM) type electron emission structure Further, those having an electron emission structure that utilizes an electron emission phenomenon due to a quantum tunnel effect (see Japanese Patent Laid-Open No. 2000-21305, also referred to as a surface conduction electron source), diamond film, graphite film, or carbon Those utilizing the electron emission phenomenon of nanotubes are known.

  FIG. 21 is a cross-sectional view illustrating a configuration example of a known field emission type image display device.

  In FIG. 21, the field emission display device includes a rear panel 100 having a field emission electron source and a control electrode formed on the inner surface, and an anode and a phosphor layer on the inner surface facing the rear panel 100. The front panel 200 is sealed at the inner peripheral edge with a sealing frame 300 interposed therebetween, and the interior formed by the back panel 100, the front panel 200, and the sealing frame 300 is maintained at a lower pressure or vacuum state than the atmospheric pressure. Configured.

  The back panel 100 intersects the cathode wiring 2 via the insulating layer 3 and a plurality of cathode wirings 2 having an electron source 2a (not shown) on one surface of the back substrate 1 preferably made of glass or ceramics. And a control electrode 4 provided. Then, the amount of electrons emitted from the electron source (including emission on / off) is controlled by the potential difference between the cathode wiring 2 and the control electrode 4.

Further, the front panel 200 has a phosphor 6 and an anode 7 on one surface of the front substrate 5 formed of a light transmissive material such as glass. The sealing frame 300 is fixed to the inner peripheral edge of the back panel 100 and the front panel 200 with an adhesive such as frit glass. The interior formed by the back panel 100, the front panel 200, and the sealing frame 300 is evacuated to a vacuum degree of 10 ⁻⁵ to 10 ⁻⁷ Torr, for example. The gap between the back panel 100 and the front panel 200 is held at a predetermined gap by the gap holding member 9.

  FIG. 22 is a diagram for explaining a configuration example of an electron emission source and a control electrode for controlling the amount of electron emission in one pixel in the field emission type display device shown in FIG. 21, and FIG. FIG. 22 (b) shows a plan view.

  In FIG. 22, an insulating layer 3 is interposed between the cathode wiring 2 provided on the rear substrate 1 of the rear panel 100 and the control electrode 4 intersecting with the cathode wiring 2. The part has an opening (grit hole) 4a. On the other hand, an electron source 2 a is provided at the intersection of the cathode wiring 2, and the insulating layer 3 is removed at a portion corresponding to the opening 4 a of the control electrode 4. The opening 4a allows electrons emitted from the electron source 2a to pass to the anode side.

  The electron source 2a is composed of, for example, carbon nanotubes (CNT), diamond-like carbon (DLC), or other field emission cathodes. The electron source 2a is shown here using carbon nanotubes (hereinafter referred to as CNT). Further, the electron source 2a is provided immediately below the opening 4a of the control electrode 4 as shown in FIG. Although FIG. 22 shows a case where there is one electron source 2a per pixel, a plurality of electron sources 2a may be used.

  FIG. 23 is a schematic cross-sectional view illustrating another configuration example of a known field emission type image display device, which includes one electron source and one opening per pixel. FIG. 24 is an enlarged cross-sectional view of a main part of part A in FIG.

  In FIG. 23, reference numeral 100 denotes a rear panel, 200 denotes a front panel, and 300 denotes a sealing frame. The back panel 100 includes a cathode wiring 2 having an electron source 2a (not shown) on the inner surface of the back substrate 1, and a control electrode 4 provided so as to be electrically insulated from the cathode wiring 2. . In this example, the control electrode 4 is held without the insulating layer 3 described above. Further, the phosphor 6 and the anode 7 are formed on the inner surface of the front substrate 5 constituting the front panel 200 in the same manner as described above.

  The control electrode 4 has a function of controlling electron emission (electron extraction) from an electron source 2 a (not shown) disposed on the cathode wiring 2. Further, a configuration in which another electrode for applying a potential for converging electrons to the phosphor 6 instead of or in addition to the control electrode 4 is also possible. In FIG. 23, the phosphor 6 is provided on the anode 7, but there is a configuration in which the anode 7 is formed so as to cover the phosphor 6. In addition, a light shielding layer (black matrix) is also provided between adjacent phosphors 6. The back panel 100 and the front panel 200 are bonded together by a sealing frame 300 and the space between them is vacuum-sealed.

  Further, as shown in FIG. 24, an electron source 2a is formed on the cathode wiring 2 provided on the back substrate 1. The electron source 2 a is made of an electron emission material that efficiently generates electrons by an electric field applied between the cathode wiring 2 and the control electrode 4. A conductive material generally has a higher electron emission performance as the outer edge exposed in an electric field has a sharper shape. Therefore, highly efficient electron emission can be realized by using a fiber-like (rod-like) conductive material. One of the electron emission materials is the CNT described above.

  When a fiber-like conductive material is used as the electron source 2a, it is necessary to fix the conductive fiber on the cathode wiring 2. Here, CNT will be described as an example of the fiber-like conductive material. This CNT 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 a hollow substance with a diameter of nanometer scale) By arranging this on the cathode wiring 2 and using it as the electron source 2a, efficient electron emission can be obtained.

  When installing the CNTs on the cathode wiring 2, an electrode paste prepared by kneading CNT together with a conductive filler such as silver or nickel is applied to form an electron source layer, which is fired and fixed on the cathode wiring 2. How to do is known. In addition, as what disclosed the prior art regarding this kind of display apparatus, Unexamined-Japanese-Patent No. 11-144652 and Unexamined-Japanese-Patent No. 2000-323078 etc. can be mentioned, for example.

  FIG. 25 is a plan view of the back panel for explaining the schematic configuration of the field emission type image display device, and shows a schematic view seen from the front panel side (not shown).

  In FIG. 25, a back substrate 1 is a plate member made up of a plurality of cathode wires 2 having an electron source on a suitable insulating substrate made of glass or alumina and a plurality of strip-like electrode elements (metal ribbon grit: MRG). A control electrode 4 is provided. The cathode wiring 2 extends in one direction on the back substrate 1, and a large number of cathode wirings 2 are arranged in parallel in the other direction intersecting the one direction.

  The cathode wiring 2 is patterned by printing a conductive paste containing silver or the like, and an electron source is disposed on the upper surface (front substrate side). One end of the cathode wiring 2 extending as a cathode wiring lead-out line 20 is led out to the outside of the frame 90 constituting the sealing frame, and the other end is inside the frame 90 and outside the display area AR. Extends to the end 22 of the.

  On the other hand, the control electrode 4 is manufactured as a separate member and installed on the back substrate 1. That is, the cathode wiring 2 having the electron source is disposed close to (above the front substrate side) and is opposed to the cathode wiring 2 over the entire display area AR with a predetermined distance. A large number of strip-like electrode elements 41 constituting the control electrode 4 extend to the other side and are arranged in parallel in the one direction. The strip electrode element 41 has an opening serving as an electron passage hole at an intersection with the electron source on the cathode wiring 2, and electrons emitted from the electron source of the cathode wiring 2 pass through the electron passage hole on the front substrate side. A pixel is formed at this intersection.

  The control electrode 4 has a large number of electron passage holes in a large number of striped thin plates formed by etching a thin plate of, for example, about 0.05 mm made of a metal material such as aluminum or iron, using a photolithography method. It is preferable to form it. Further, the control electrode 4 is fixed on the back substrate 1 by a holding member 60 made of an insulator such as a glass material at a fixing portion provided outside the display area AR.

  A lead wire (control electrode lead wire) 40 is connected to the control electrode 4 in the vicinity of the fixed portion or in the vicinity of the frame 90 and is drawn to the outer edge of the image display device. The frame 90 can also have the function of the holding member 60. Then, the amount of electrons emitted from the electron source in the cathode wiring 2 is controlled by the potential difference between the cathode wiring 2 and the control electrode 4.

  On the other hand, a front substrate (not shown) is made of a light-transmitting insulating material such as glass, and has an anode and a phosphor on its inner surface. The phosphor is disposed corresponding to the pixel formed at the intersection of the cathode wiring 2 and the control electrode 4. In the figure, x indicates the extending direction of the control electrode 4, y indicates the extending direction of the cathode wiring 2, and z indicates the direction orthogonal to the substrate surfaces of the back substrate and the front substrate.

The rear substrate 1 and the front substrate configured as described above are sealed through the frame body 90, and the sealed internal space is vacuum-sucked from the exhaust hole 11 to, for example, 10 ⁻⁵ to 10 ⁻⁷ Torr. A field emission display device is formed by evacuation to a vacuum. The electron source 2a is composed of, for example, carbon nanotubes (CNT), diamond-like carbon (DLC), or other field emission cathode materials.

In addition, as what disclosed the prior art regarding this kind of image display apparatus, the patent document 1 thru | or patent document 5 etc. which are shown below can be mentioned, for example.
US Pat. No. 3,453,478 JP 2000-21305 A Japanese Patent Application Laid-Open No. 11-144652 JP 2000-323078 A JP 2001-338528 A

  In the image display device configured as described above, electrons emitted from the electron source 2a pass through the aperture 4a and strike the phosphor 6 on the anode 7, and the phosphor 6 is excited to emit light. Image display is performed, and high-luminance and high-definition characteristics can be obtained, and a light-weight and space-saving flat display can be realized.

  However, the image display device configured as described above is coaxial with each electron source 2a formed on the cathode wiring 2 and each aperture 4a formed in the control electrode 4 corresponding to these electron sources 2a. Is not obtained with high accuracy over the entire surface of the display area, an unnecessary cathode current flows into the control electrode 4 to cause a disturbance to the anode current. As a result, the display efficiency of the display screen is lowered. Further, when the control electrode 4 is formed of a metal material, a means for solving heat dissipation is required in addition to a decrease in display efficiency.

  Further, in the configuration having an acceleration electrode in addition to the control electrode and capable of performing a triode electron emission operation similar to the triode structure of an electron gun for a cathode ray tube, the coaxiality of the electron source, the control electrode, and the acceleration electrode It is even more difficult to secure and there is a need for a solution.

  On the other hand, as means for solving such a problem, if the electron source 2a on the cathode wiring 2 and the opening 4a of the corresponding control electrode 4 are self-aligned, the electron source 2a and the opening 4a can be made highly accurate. Can be matched with. As a means for this self-alignment, there is a means for manufacturing the back substrate 1 to the control electrode 4 by a photoetching method. However, the production means using the photo-etching method cannot be applied to the production of a control electrode that realizes a large screen with a nominal screen diagonal of 42 inches, for example, and is extremely difficult to put into practical use.

  Further, for the enlargement of the screen, it is difficult to achieve self-alignment because the control electrode 4 is formed in a very delicate web shape by means of the control electrode 4 having a strip electrode element (MRG) structure. Therefore, it is necessary to assemble the back substrate 1 and the control electrode 4 having the MRG structure with a tolerance of submicron order regardless of the single-piece structure or the assembly structure, which is not practical. This type of problem is not sufficient for practical use of a large-screen image display device, and has been one of the problems to be solved.

  Accordingly, the present invention has been made to solve the above-described conventional problems, and self-aligns the effective range of each electron source formed on the back substrate and the openings of the control electrode and the acceleration electrode. It is an object of the present invention to provide an image display apparatus and a method for manufacturing the same, which can ensure the coaxiality, can achieve a desired high-quality display, and can easily realize a large display image.

  The image display device and the manufacturing method thereof according to the present invention are characterized in that one of the acceleration electrode and the control electrode has an electrode configuration including a mesh substrate.

  Hereinafter, representative configurations of the image display device and the manufacturing method thereof according to the present invention will be described.

A front substrate having an anode and a phosphor on the inner surface, a plurality of cathode wirings extending in one direction and arranged in parallel in the other direction intersecting the one direction, and being electrically connected to the cathode wiring. A plurality of electron sources on the inner surface, the rear substrate facing the front substrate with a predetermined distance, and the electrons from the electron source in the display area interposed between the rear substrate and the front substrate. A control electrode having an electron passage hole to be passed to the front substrate side;
An accelerating electrode that is interposed between the control electrode and the front substrate and has an electron passage hole that passes electrons that have passed through the electron passage holes of the control electrode, and that accelerates electrons that pass through the electron passage hole; A plurality of spacing members arranged in the display area between the front substrate and the back substrate, for holding the predetermined distance, and the display area between the front substrate and the back substrate. An image display device comprising: a support member that is inserted around and holds the predetermined interval; and an end surface of the support member and the front substrate and the rear substrate are hermetically sealed through sealing members, respectively. And
Any one of the control electrode and the acceleration electrode has an electrode configuration including a conductive mesh substrate.

  In the image display device according to the present invention, the mesh substrate may be a mesh plate, and the mesh substrate may further include a through hole that penetrates the spacing member. The through hole that penetrates the gap holding member may have a narrow portion that is forcibly fitted with the gap holding member, and the gap holding member is a portion where the gap holding member of the mesh substrate is disposed. It can arrange | position through the thin part of.

Furthermore, the manufacturing method of the image display device according to the present invention includes a front substrate having an anode and a phosphor on the inner surface, a plurality of cathode wirings extending in one direction and arranged in parallel in the other direction intersecting the one direction, A back substrate having an inner surface with a plurality of electron sources arranged in electrical conduction on the cathode wiring and facing the front substrate at a predetermined interval, and interposed between the back substrate and the front substrate A control electrode having an electron passage hole for allowing electrons from the electron source to pass to the front substrate side in the display area, and the control electrode and the front substrate interposed between the control electrode and the electron passage holes of the control electrode. An acceleration electrode for accelerating electrons passing through the electron passage hole and the front substrate and the rear substrate, and disposed in the display region, Between several to keep the interval A holding member, a support member that is inserted around the display area between the front substrate and the rear substrate, and holds the predetermined distance; an end surface of the support member; and the front substrate and the rear substrate; Each of which is hermetically sealed via a sealing member,
A step of forming the accelerating electrode by covering the one surface of a conductive mesh-like substrate with an insulating layer except for the electron passage holes, and disposing the insulating layer side of the accelerating electrode facing the cathode wiring side. The method includes a step of incorporating into a predetermined portion between the front substrate and the rear substrate.

  In the image display device manufacturing method according to the present invention, a control electrode having an electron passage hole coaxial with the electron passage hole is formed on the insulating layer opposite to the acceleration electrode, and the control electrode is formed on the cathode wiring. It can be set as the structure which arranges and opposes on the side.

  With the above-described configuration, an image display device capable of high-quality display and having a large screen and a manufacturing method thereof can be realized.

  The present invention is not limited to the above-described configuration and the configurations of the embodiments described later, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

As described above, according to the image display device of the present invention, the conductive mesh-like base material is either the acceleration electrode or the control electrode, and the remaining control electrode or acceleration electrode is integrated with this via the insulating layer. By using the grit electrode assembly formed in the above, the grit electrode assembly can be formed very easily by utilizing the characteristics of the configuration of the mesh substrate.

In addition, the self-alignment of the electron passage holes of the acceleration electrode and the control electrode is possible, and it is not necessary to increase the precision of the electrode structure and assembly structure, and the precision can be loosely manufactured. In addition to being able to improve the cost of component parts, it is possible to obtain extremely excellent effects such as that the display image can be easily enlarged and can be realized at low cost.
Furthermore, a grit electrode assembly having two electrodes, that is, an acceleration electrode and a control electrode, can be handled as a single product, and the workability and dimensional accuracy can be improved including the assembly process of the image display device.
In addition, in the configuration in which the spacer is fixed between the grit electrode assembly and the front substrate, the height of the spacer itself can be lowered, the mechanical strength can be improved, and further, the warp and the bending of the grit electrode assembly can be prevented. The distance and the distance between the substrates in the display area can be maintained with high accuracy.
Further, in the configuration in which the spacer is disposed through the spacer holding hole provided in the grid electrode assembly, the spacer is also held by the spacer holding hole and fixed to both substrates, so that the inclination of the spacer itself can be achieved. In addition, the mechanical strength can be improved by fixing the three points.
Further, since the spacer penetrates the spacer holding hole in a good contact state, an extremely excellent effect such as a stable electric field can be obtained.

  Embodiments of the present invention will be described below in detail with reference to the drawings of the embodiments.

  FIG. 1 is a schematic explanatory view of a schematic configuration of an example of a field emission type image display device according to an embodiment of the display device of the present invention. FIG. 2 is a plan view seen from the front substrate side, and FIG. It is a typical sectional view of a line.

  1 and 2, reference numeral 12 denotes a front substrate, which is composed of a transparent glass plate or the like. Reference numeral 13 denotes a rear substrate, which is preferably made of ceramics such as glass or alumina, like the front substrate 12, and is composed of an insulating substrate having a thickness of several mm, for example, about 3 mm. Reference numeral 14 denotes an airtightly attached portion, which is stacked in the z direction via the sealing members 142 disposed on the upper and lower end surfaces of the support 141 that also serves as an outer frame. Is hermetically sealed.

  The z direction indicates a direction orthogonal to the substrate surfaces of the back substrate 13 and the front substrate 12.

  The support 141 is made of a glass plate or a shaped product of frit glass, while the sealing member 142 is preferably frit glass.

  That is, the sealing member 142 is made of a glass material including, for example, PbO: 75 to 80 wt%, B2 O3: about 10 wt%, others: 10 to 15 wt%, and amorphous type frit glass. Those are preferred.

  Further, the support 141 and the sealing member 142 may be integrally formed of the same material.

  Further, a portion surrounded by the hermetic sealing portion 14 constitutes a display region 143, and the portion of the display region 143 is kept in a vacuum.

  Further, the display area 143 is provided with a plurality of thin plate-like spacing member spacers 15 having a function of keeping the distance between the substrates 12 and 13 in this area at a predetermined size. One end of the upper and lower ends of the substrate 15 is fixed to the front substrate 12 with a fixing material 151 such as frit glass, and the other end is fixed to a grid electrode assembly described later with a fixing material 151 such as frit glass.

  Next, reference numeral 16 is a cathode wiring, and a plurality of cathode wirings 16 extend in the direction (y direction) on the inner surface of the back substrate 13 and are arranged in parallel in the other direction (x direction). The end of the cathode wiring 16 is divided into two sides of the rear substrate 13 as a cathode wiring lead-out line 161 and led out to the outside of the hermetic seal 14.

  The cathode wiring 16 is formed by, for example, vapor deposition, or a thick film made of silver paste in which conductive silver particles having a particle diameter of several μm, for example, about 1 to 5 μm are mixed with low-melting glass exhibiting insulating properties. For example, it is formed by printing and firing at about 600 ° C., for example.

Reference numeral 17 is a control electrode, 18 is an acceleration electrode, and the control electrode 17 and the acceleration electrode 18 are arranged with an insulating layer 19 interposed therebetween, and the electron passage holes 17a and 18a and the electron passage through the insulating layer 19 pass therethrough. A grit electrode assembly 23 is formed by integrating the three central axes of the opening 19a corresponding to the holes.
An example of the configuration of the grit electrode assembly 23 is shown in FIG.
FIG. 3 is a schematic exploded perspective view of an example of the grit electrode assembly used in the image display device of the present invention. The same reference numerals are given to the same portions as those in the above-described drawings.
The grit electrode assembly 23 uses a mesh substrate 181 that also serves as the acceleration electrode 18 as a substrate.
The mesh substrate 181 is composed of a mesh plate made of, for example, a nickel-chromium-iron alloy and having a thickness of several tens of microns, for example, a thickness of about 20 microns. The mesh plate has an opening shape as shown in FIG. A large number of circular through holes 182 are uniformly arranged on the entire surface.
FIG. 4 is a schematic plan view of an example of a mesh substrate constituting the grit electrode assembly used in the image display device of the present invention. The same reference numerals are given to the same parts or parts having the same functions as those in the above-mentioned figures. It is.
3 and 4, the mesh substrate 181 includes an insulating layer 19 formed on one surface thereof by a method such as thick film printing or a combination of dry film and etching.
For example, in the case of thick film printing, the insulating layer 19 is formed by utilizing the difference in shape between the large number of circular through holes 182 (concave portions) and the remaining portions (convex portions) of the mesh-shaped substrate 181, The insulating layer 19 having the openings 19a is formed by applying the insulating material to the remaining portion.
Further, in the method using a combination of a dry film and etching, it can be formed by patterning using the mesh substrate 181 itself as a mask.
The control electrode 17 is formed by printing directly on the other surface of the insulating layer 19 with, for example, silver paste or by a method such as metal vapor deposition or plating.
As shown in FIGS. 1 and 2, the grit electrode assembly 23 having such a structure is bonded to a predetermined position on the back substrate 13 with the control electrode 17 side facing the back substrate 13, for example, frit glass. The second insulating layer 24 is fixed with a fixing material 25 made of frit glass, and is disposed in front of the cathode wiring 16 (on the front substrate 12 side) and insulated from the cathode wiring 16 and the electron source 26. Has been. Further, the end portions of the control electrode 17 and the acceleration electrode 18 are led out to the outside of the hermetic attachment portion 14 of the rear substrate 13 as electrode lead lines.
As described above, the grit electrode assembly 23 is a thin plate having a function of maintaining a predetermined distance between the substrates 12 and 13 on the front surface (front substrate 12 side) on the acceleration electrode 18 side. The spacer 15 is fixed by a fixing material 151 such as frit glass.
In this embodiment, the fixing position is a position corresponding to a portion where the second insulating layer 24 for fixing the grit electrode assembly 23 to the rear substrate 13 is disposed. -It is set as the structure which can also suppress generation | occurrence | production of the deformation | transformation of the grit electrode assembly 23 by fixing the support 15.

  On the other hand, the electron source 26 on the cathode wiring 16 is a metal-insulator-metal (MIM) type electron-emitting device, or an electron-emitting structure utilizing an electron-emitting phenomenon due to a quantum tunnel effect (also called a surface conduction electron source). ) It is composed of an element, a diamond film, a graphite film, a carbon nanotube or the like, and is arranged on the cathode wiring 16 at a predetermined pitch.

  As a method for forming the electron source 26, for example, a method of forming a carbon nano tube paste on the surface of the cathode wiring 16 which has been printed and fired with a thick film, and fired at 590 ° C. in a vacuum, for example, is used. it can.

  In this embodiment, the carbon nanotube tube was a single wall carbon nanotube dispersed in ethylene cellulose and terpineol.

  Here, the single-wall carbon nanotubes have been described above, but these may be multi-wall carbon nanotubes or carbon nanofibers. Besides these, for example, diamond, diamond Like carbon, graphite, amorphous carbon or the like can be used, and it is needless to say that a mixture thereof may also be used.

  On the other hand, a metal back film 28 (anode) and a phosphor film 29 constituting the phosphor screen 27 are disposed on the inner surface of the front substrate 12, and electrons emitted from the electron source 26 disposed on the cathode wiring 16 are transferred. After passing through the electron passage hole 17a of the control electrode 17 to which a grit voltage of about several tens V, for example, about 50 V is applied, and passing through the opening 19a of the insulating layer 19, several hundred V, For example, it is controlled by the electron passage hole 18a of the acceleration electrode 18 to which an acceleration voltage of about 200 V is applied, and is directed to the phosphor screen 27 to which an anode voltage of 10 KV is applied, for example, and passes through the metal back film 28 (anode) to fluoresce. The body film 29 is projected to emit light, and a desired display is performed on the projected image plane.

  Although not shown, the phosphor screen 27 is provided with a black matrix (BM) film, and the phosphor screen of this embodiment has substantially the same configuration as a conventional color cathode-ray tube phosphor screen.

  Then, unit pixels are formed in a matrix at intersections between the cathode wiring 16 and the control electrode 17 and the acceleration electrode 18, and the display area is formed by the pixels arranged in the matrix. In general, a color pixel composed of red (R), green (G), and blue (B) is constituted by three groups of the unit pixels.

Here, the hermetic sealing performed through the sealing member 142 is performed, for example, in a nitrogen atmosphere at a temperature of, for example, about 430 ° C., and then, for example, heated at about 350 ° C. and exhausted and sealed in a vacuum. Is available.
In the configuration of this embodiment, a grid-like substrate in which circular through-holes are uniformly arranged on the entire surface is used for the acceleration electrode, and a grit electrode structure in which a control electrode is integrally formed through an insulating layer is used. By adopting the configuration, this grit electrode assembly can be formed very easily by utilizing the characteristics of the configuration of the mesh substrate, and self-alignment of the electron passage holes of the acceleration electrode and the control electrode is possible. Become. In addition, since the electron passage hole is circular, the electric field distribution is uniform and beam control is easy, and high-quality display is possible.
Furthermore, since the spacer is fixed between the grit electrode assembly and the front substrate, the height of the spacer itself can be lowered and the mechanical strength can be improved. Further, it is possible to prevent warping and bending of the grit electrode structure, and to maintain the distance between the electrodes and the distance between the substrates in the display area with high accuracy.
Further, the grit electrode assembly can be handled as a single product, and the workability and dimensional accuracy can be improved including the assembly process of the image display device.
Next, FIG. 5 is a schematic cross-sectional view of a schematic configuration of an example of a field emission type image display device of another embodiment of the display device of the present invention. Are marked with the same symbol.
In the embodiment shown in FIG. 5, the spacer 15 disposed in the display region 143 passes through the grid electrode assembly 33 and is fixed between the substrates 12 and 13.
The grit electrode assembly 33 is configured by integrally laminating a control electrode 36 on one side of an acceleration electrode 34 having a mesh-like base material via an insulating layer 35 in the same manner as the grit electrode assembly 23 shown in FIG. However, the grit electrode assembly 33 has a structure in which the insulating layer 35 and the control electrode 36 are omitted in a portion where the spacer 15 penetrates and in the vicinity thereof.
FIG. 6 is a schematic plan view of an example of a mesh-like base material used for the grit electrode assembly 33. The same reference numerals are given to the same portions or portions having the same functions as those of the above-described drawings.
In FIG. 6, the mesh substrate 341 includes a strip plate 343 having a large number of circular through holes 342 through which an electron beam passes, a connecting portion 344 that connects the strip plates 343, and the strip plates 343. The structure having the spacer holding hole 345 and the square hole 346 provided also serves as the acceleration electrode 34.
The spacer holding hole 345 of the mesh-like base material 341 is provided at a position corresponding to the spacer 15 arranged in the display region 143, and an example of the details is shown in FIG. FIG. 7 is an enlarged plan view of the spacer holding hole of FIG.
The spacer holding hole 345 has a width T larger than the thickness of the spacer 15 and a length L, and is provided with a plurality of protrusions 345a protruding from the hole end surface toward the center. T1 is the protrusion length of the protrusion 345a.
As shown in FIG. 7, the details of one example of the protrusion 345a are formed by making the thickness of this portion thinner than the thickness of the base material, or by notching the base portion of the protrusion 345a although not shown. It deforms when stress is applied.
Here, an example of each dimension will be described. For example, when the spacer has a thickness of 50 microns, the hole width T may be 100 microns, and the protrusion length T1 of the protrusion may be, for example, about 30 microns.
As a result, in the operation of inserting the spacer 15 into the spacer holding hole 345, the protrusion is deformed and can be easily inserted, and the contact state between the two can be satisfactorily maintained after the insertion. 8 is a cross-sectional view taken along the line CC of FIG.
The square holes 346 have substantially the same dimensions as the spacer holding holes 345 and are provided at positions different from the spacer holding holes 345 between the belt-like plates 343. The square hole 346 may have the same shape as the spacer holding hole 345.
The square hole 346 that does not engage with the spacer 15 can contribute to an improvement in the efficiency of the exhaust operation.
Alternatively, the spacer holding hole 345 may have a half-etched structure and may be opened through the spacer when assembled with the spacer.
The grit structure 33 includes the mesh base material 341. The insulating layer 35 and the control electrode 36 are attached only to the belt-like plate 343 portion of the mesh base material 341, and the remaining spacer holding holes 345, corners are provided. The insulating layer 35 and the control electrode 36 are missing from the hole 346 and the connecting portion 344.
In the configuration of this embodiment, a grid electrode structure in which circular through holes are uniformly arranged on the entire surface of the acceleration electrode and a control electrode is integrally formed on the acceleration electrode via an insulating layer is provided. By using the configuration, this grit electrode structure can be formed very easily by utilizing the characteristics of the configuration of the mesh substrate, and self-alignment of the electron passage holes of the acceleration electrode and the control electrode is possible. It becomes. In addition, since the electron passage hole is circular, the electric field distribution is uniform and beam control is easy, and high-quality display is possible.
Furthermore, the spacer also has a three-point fixing structure in which the spacer holding hole provided in the grit electrode assembly is penetrated and held at the portion, and is fixed to both substrates, thereby preventing the inclination and breakage of the spacer itself. The mechanical strength can be improved by fixing at three points. Further, it has a feature that the distance between the electrodes and the distance between both substrates can be maintained with high accuracy.
Furthermore, since the grit electrode assembly also has a combined configuration of a belt-like plate and a connecting portion, it can follow irregularities such as waviness of the back substrate, and can prevent warping and bending. In addition, the insulating layer can be formed thick and uniform on the belt-like plate, and interference between both electrodes can be reduced. Furthermore, the grid electrode assembly can be handled as a single product, and the workability and dimensional accuracy can be improved including the assembly process of the image display device.
Next, FIG. 9 is a schematic plan view showing another example of a mesh-like substrate used in the image display device of the present invention. is there.
In FIG. 9, the mesh-like base material 441 includes a belt-like portion 443 having a large number of circular through holes 442 through which an electron beam passes, a non-hole portion 444 that connects these belt-like portions 443, and the belt-like plate 343. The spacer holding hole 445 provided in the non-hole portion 444 is also used as the acceleration electrode 44.
The spacer holding hole 445 of the mesh substrate 441 has a configuration that matches the shape of the spacer 15 at a position corresponding to the spacer 15 arranged in the display region 143. Further, the spacer holding hole shape may have a projection as shown in FIG. 7 and FIG.
In the mesh-like base material of the embodiment shown in FIG. 9, the grit electrode assembly is configured as a mesh-like base material by arranging a large number of circular through-holes through which an electron beam passes with a non-hole portion interposed therebetween. By using this feature, it can be formed very easily, and self-alignment of the electron passage holes of the acceleration electrode and the control electrode becomes possible. In addition, since the electron passage hole is circular, the electric field distribution is uniform and beam control is easy, and high-quality display is possible.
Further, as shown in FIG. 5 described above, the spacer has a three-point fixing structure in which the spacer holding hole provided in the grit electrode assembly is penetrated and held in this portion, and fixed to both substrates. In addition, the mechanical strength can be improved by fixing the three points. In addition, it has the feature that the distance between the electrodes and the distance between both substrates can be maintained with high accuracy, and since it has mechanical strength due to the presence of non-holes, it can be handled as a single plate. It is also excellent in efficiency.
Next, FIG. 10 is a schematic plan view showing still another example of the mesh-like substrate used in the image display device of the present invention. The same reference numerals are given to the same parts or parts having the same functions as the above-mentioned figures. It is.
In FIG. 10, a mesh-like base material 541 has a belt-like portion 543 provided with a number of oval through-holes 542 through which an electron beam passes, a non-hole portion 544 that connects these belt-like portions 543, and the oval through-holes. The structure includes a spacer holding hole 545 that intersects the major axis of the hole 542 at a right angle and is arranged over the entire width at the end of the mesh-like base material 541 and also serves as the acceleration electrode 54.
The spacer holding hole 545 of the mesh-like base material 541 has a configuration that matches the shape of the spacer 15 at a position corresponding to the spacer 15 disposed in the display region 143. Further, the spacer holding hole shape may be formed by forming a protrusion as shown in FIGS. 7 and 8 or by notching.
In the mesh substrate of the embodiment shown in FIG. 10, a grit electrode having an insulating layer and a control electrode is formed by arranging a large number of oval through-holes through which an electron beam passes with a non-hole portion interposed therebetween. The structure can be formed very easily by utilizing the characteristics of the configuration of the mesh-like base material, and the self-alignment of the electron passage holes of the acceleration electrode and the control electrode is possible, thereby enabling high-quality display.
Furthermore, the spacer can also have a three-point fixing structure in which the spacer holding hole provided in the grit electrode assembly is penetrated and held at the portion and fixed to both substrates, and the spacer itself can be prevented from tilting and breaking. The mechanical strength can be improved by fixing three points. Further, it has a feature that the distance between the electrodes and the distance between both substrates can be maintained with high accuracy.

Next, FIG. 11 is a schematic plan view showing a spacer arrangement pattern of still another embodiment of the image display device of the present invention. The same reference numerals are given to the same parts or the parts having the same functions as the above-mentioned figures. .
In the spacer arrangement pattern shown in FIG. 11, the spacers 15 are aligned in the longitudinal direction parallel to the short sides of the back substrate 13, and a plurality of the spacers 15 are arranged at equal pitches in the longitudinal direction of the back substrate 13 to form a row. In this arrangement pattern, three rows are provided in the short side direction, and the central row is arranged with a half pitch shift from the upper and lower rows.
In the arrangement pattern configuration as shown in FIG. 11, since the spacers are evenly arranged in the display area, it has the feature that the distance between the two substrates in the display area can be maintained with high accuracy. Even in the configuration in which the spacer is disposed so as to penetrate the grit electrode assembly as in 5, the mechanical strength of the grit electrode assembly itself is not lowered at all with this arrangement pattern, and there is no problem in terms of workability. Further, even in the exhaust operation, if this arrangement pattern is used, the exhaust conductance is not deteriorated and a high vacuum can be obtained in a short time, so that the workability can be improved and a long-life display device can be obtained.

  Next, FIG. 12 is a schematic plan view on the back substrate side in another embodiment of the image display device of the present invention, FIG. 13 is a DD sectional view of FIG. 12, and FIG. 14 is an EE sectional view of FIG. The same symbols are attached to the same parts or parts having the same functions as those in the above-described drawings.

  12 to 14, the cathode wiring 16 extends in one direction on the back substrate 13 by means such as thick film printing, and is arranged in parallel in the other direction crossing this one direction.

  On the other hand, a second insulating layer 24 made of, for example, frit glass and a fixing material 25 made of, for example, frit glass disposed on the insulating layer 24 are arranged on the substrate surface including the cathode wiring 16.

  The second insulating layer 24 and the fixing material 25 extend in a direction perpendicular to the cathode wiring 16 and are juxtaposed in the other direction intersecting the extending direction, and are sandwiched between the control electrode and the acceleration electrode. A grit electrode assembly having a structure including an insulating layer is fixed at a predetermined position on the rear substrate.

  An electron source 26 is disposed at a position separated by the second insulating layer 24 on the cathode wiring 16 and the fixing material 25 disposed on the insulating layer 24.

  With this configuration, the grit electrode assembly can be prevented from being bent or warped by the insulating layer 24 and the fixing material 25 disposed in the middle, and the inter-electrode spacing can be maintained with high accuracy.

  Next, FIG. 15 is a schematic plan view on the back substrate side in still another embodiment of the image display device of the present invention, FIG. 16 is a sectional view taken along line FF in FIG. 15, and FIG. 17 is a sectional view taken along line GG in FIG. Thus, the same symbols are attached to the same parts or parts having the same functions as those in the above-described drawings.

  15 to 17, the cathode wiring 16 extends in one direction on the back substrate 13 by means of, for example, thick film printing, and is arranged in parallel in the other direction crossing this one direction.

  The cathode wirings 16 are grouped. When one pixel is formed of R (red), G (green), and B (blue), the second insulation is arranged on the substrate surface including the cathode wirings 16. The layer 24 and the fixing material 25 are also disposed between the pixels. That is, in this embodiment, the second insulating layer 24 and the fixing material 25 disposed on the insulating layer 24 extend in a direction perpendicular to the cathode wiring 16 and in the other direction intersecting the extending direction. They are arranged side by side and extend in the same direction as the extending direction of the cathode wiring 16 (24a, 25a). An electron source 26 is disposed at a position separated by the second insulating layer 24 on the cathode wiring 16 and the fixing material 25 disposed on the insulating layer 24.

  With this configuration, the grit electrode assembly can be prevented from being bent or warped by the insulating layer 24 and the fixing material 25 disposed in the middle, and the inter-electrode spacing can be maintained with high accuracy.

  Further, since the insulating layer 24a and the fixing material 25a are arranged between the pixels, the inter-electrode spacing can be controlled with higher accuracy, and the spacer holding hole can be set to a desired size without causing a decrease in strength of the grit electrode assembly.

  Next, FIG. 18 is a partially cutaway plan view of another embodiment of the image display apparatus of the present invention. The same reference numerals are given to the same parts or parts having the same functions as those in the above-mentioned figures.

  FIG. 18 is a view of the rear substrate 13 side as seen from the inner surface side of the front substrate. The cathode wiring 16 is arranged on the rear substrate 13 at a predetermined pitch, and has a pattern parallel and transverse to the cathode wiring 16 thereon. A second insulating layer 24 (not shown) and a fixing material 25 are disposed.

  In addition, an electron source 26 is disposed in a region surrounded by the fixing material 25 on the cathode wiring 16, and a grid electrode assembly 64 is placed thereon so as to cover substantially the entire display region described above. The grit electrode assembly 64 is fixed to the fixing material 25.

  On the other hand, the spacer 15 passes through the grit electrode assembly 64 and is fixed to the back substrate 13 via the fixing material 25 on the second insulating layer 24.

  The grid electrode assembly 64 includes an acceleration electrode 65, and an insulating layer and a control electrode that are sequentially stacked on the lower side.

  The acceleration electrode 65 includes an electron passage hole 652 composed of a plurality of oval through holes in the mesh substrate 651, a band portion 653 in which the electron passage holes 652 are arranged, and a connecting portion 654 that connects the band portions 653 to each other. In addition, a spacer holding hole 655 for penetrating and holding the spacer 15 disposed between the belt-shaped portions 653 and a square hole 656 serving as a gap are provided, and the electron passage hole 652 is disposed to face the electron source 26. Has been.

  With the configuration of FIG. 18, the grit electrode assembly is bent due to a synergistic effect such as the structure of the grit electrode assembly, the arrangement pattern configuration of the insulating layer 24 and the fixing member 25, and the engagement structure with the spacers arranged through. And warpage can be prevented, and the distance between the electrodes can be maintained with high accuracy.

  Further, since the insulating layer 24a and the fixing material 25a are arranged between the pixels, the inter-electrode spacing can be controlled with higher accuracy, and the spacer holding hole can be set to a desired size without causing a decrease in strength of the grit electrode assembly. Further, the exhaust between the grid electrode assembly 64 and the back substrate can be facilitated, the degree of vacuum can be improved, and the drive capacity can be reduced.

Next, a method for manufacturing an image display device according to the present invention will be described. FIG. 19 is a process diagram for describing a method for manufacturing an image display device according to the present invention. Is attached.

  The process diagram shown in FIG. 19 will be described with reference to the embodiment of the image display apparatus of the present invention shown in FIGS.

  In FIG. 19, the front substrate 12 is formed by forming a phosphor screen 27 including a BM film, a phosphor film 29 and a metal back film 28 on one surface of the front substrate glass.

On the other hand, after the cathode wiring 16 is formed on the glass for the back substrate by means of pressure film printing, for example, the second insulating layer 24 is formed by printing and baking in a predetermined pattern using, for example, frit glass. The thickness of the insulating layer 24 may be a dimension that can secure a gap between the electron source 26 and the control electrode 17.

  Next, the fixing material 25 is formed on the second insulating layer 24 by printing and baking in a predetermined pattern using, for example, frit glass.

  Next, as described above, an electrode paste prepared by kneading CNT together with a conductive filler such as silver or nickel is applied and formed on the cathode wiring 16 to form the electron source 26 to form the back substrate 13.

  The grit electrode assembly 23 includes a conductive mesh substrate 181 having a large number of circular through holes 182 as shown in FIG. 4, and an insulating layer 19 as shown in FIG. 3 on one side thereof. Form.

  The insulating layer 19 corresponds to the through hole 182 by utilizing the uneven shape of the conductive mesh-shaped substrate 181, that is, the shape difference between the concave portion (through hole portion) and the convex portion (the remaining portion excluding the through hole portion). The manufacturing method is formed on one surface of the conductive mesh substrate 181 by thick film printing or a combination of dry film and etching.

  On the other hand, the control electrode 17 is formed on the insulating layer 19 by printing or vapor deposition to form a grit electrode assembly 23. The control electrode 17 is directly printed with a silver paste or formed by a method such as metal vapor deposition or plating.

  The grid electrode assembly 23 is fixed to the fixing material 25 on the back substrate 13 to form a back substrate assembly BPA.

  On the other hand, the sealing member 142 is apply | coated to the both end surfaces of the support body 141, and it pre-bakes. The temperature during this preliminary firing is, for example, about 350 ° C. to 450 ° C., depending on the composition when frit glass is used.

  Further, the fixing material 151 is applied to both end faces of the spacer 15 and pre-baked. The temperature during this preliminary firing is, for example, about 350 ° C. to 450 ° C., depending on the composition when frit glass is used.

  Next, the spacer 15 is fixed to the front substrate 12 with a fixing material 151 to obtain a front substrate assembly FPA.

  Next, the front substrate assembly FPA, the rear substrate assembly 13 having the electron source 26 and the like, and the support 141 having the sealing member 142 are arranged in a predetermined positional relationship, for example, as shown in FIGS. The temporary panel TPA is formed by combining the positional relationships.

  Next, while pressing both substrates 12 and 13 of the temporary panel TPA in the Z direction, the sealing member 142 and the fixing material 151 are melted by heating to, for example, 450 ° C. in a nitrogen atmosphere, and then the heating temperature is set to 350 ° C., for example. The lower sealing member 142 and the fixing member 151 are cured to hermetically seal between the substrates 12 and 13 and the support 141, and the spacer 15 fixed to the front substrate 12 is fixed to the grit electrode assembly 23.

  Next, a space serving as a display region 143 surrounded by the substrates 12 and 13 and the support 141 is exhausted through an exhaust pipe (not shown).

  This evacuation can be performed simultaneously with heating in the melting step of the sealing member 142 with the temporary panel TPA placed in a vacuum furnace.

  After that, in the configuration including the exhaust pipe, after the exhaust is completed, the exhaust pipe is chipped off to manufacture the display device.

In the method of this embodiment, a grit electrode assembly is used in which a mesh substrate is used, the openings of the mesh substrate are used as electron passage holes, and a control electrode is integrally formed on the mesh substrate via an insulating layer. Thus, the grit electrode assembly can be formed very easily by utilizing the characteristics of the configuration of the mesh substrate, and the self-alignment of the electron passage hole between the acceleration electrode and the control electrode can be performed. Since the electron source 26 is formed after the insulating layer 24 and the fixing material 25 are formed, there is no fear of the electron source 26 being contaminated, and an image display capable of high-efficiency electron emission, high brightness, and high-quality display. Equipment can be provided.
Furthermore, since the spacer is fixed between the grit electrode assembly and the front substrate, the height of the spacer itself can be lowered and the mechanical strength can be improved. Further, it is possible to prevent warping and bending of the grit electrode structure, and to maintain the distance between the electrodes and the distance between the substrates in the display area with high accuracy.
Further, the grit electrode assembly can be handled as a single product, and the workability and dimensional accuracy can be improved including the assembly process of the image display device.

  Next, FIG. 20 is a process diagram of another example for explaining the manufacturing method of the image display device of the present invention. The same reference numerals are given to the same parts or parts having the same functions as those in the above-mentioned figures.

  In the manufacturing method shown in FIG. 20, as compared with the manufacturing method shown in FIG. 19, the second insulating layer 24 and the fixing material 25 are disposed on the grit electrode assembly 23 side.

  In the method of this embodiment, in addition to the same features as the method of FIG. 19, the surface treatment of the electron source 26 is facilitated.

Next, in the structure in which the spacer 15 as shown in FIG. 5 penetrates the grit electrode assembly 33, the spacer 15 penetrates the grit electrode assembly 33 in advance in addition to the method described in FIGS. 19 and 20 described above. Alternatively, after fixing to the second insulating layer 24 and the fixing material 25 on the back substrate 13, it may be fixed to the front substrate 12.
When this spacer penetrates the grid electrode assembly, a mesh substrate is used, and a grid electrode assembly in which a control electrode is formed integrally with an insulating layer is used. It can be formed very easily by utilizing the feature of the configuration of the substrate, and the self-alignment of the electron passage holes of the acceleration electrode and the control electrode becomes possible.
Furthermore, the spacer also has a three-point fixing structure in which the spacer holding hole provided in the grit electrode assembly is penetrated and held at the portion, and is fixed to both substrates, thereby preventing the inclination and breakage of the spacer itself. The mechanical strength can be improved by fixing at three points. Further, it has a feature that the distance between the electrodes and the distance between both substrates can be maintained with high accuracy.
Furthermore, the grid electrode assembly can be handled as a single product, and the workability and dimensional accuracy can be improved including the assembly process of the image display device.

  Here, in the above-described embodiments, the mesh-like base material has been described as an acceleration electrode. However, the acceleration electrode is formed by a method such as silver paste printing or metal vapor deposition through an insulating layer using the mesh-like base material as a control electrode. Of course, you may do.

It is a top view of schematic structure of one Example of the image display apparatus of this invention. It is sectional drawing of the BB line of FIG. It is a disassembled perspective view of an example of the grit electrode structure used for the image display apparatus of this invention. It is a top view of an example of the mesh-shaped base material which comprises the grit electrode structure used for the image display apparatus of this invention. It is sectional drawing of schematic structure of the other Example of the image display apparatus of this invention. It is a top view of an example of the mesh-shaped base material used for the grit electrode structure of the other Example of the image display apparatus of this invention. FIG. 7 is an enlarged plan view of the spacer holding hole of FIG. 6. It is sectional drawing of CC line of FIG. It is a top view which shows the other example of the mesh-shaped base material used for the image display apparatus of this invention. It is a top view which shows the further another example of the mesh-shaped base material used for the image display apparatus of this invention. It is a top view which shows the spacer arrangement | sequence pattern of other Example of the image display apparatus of this invention. It is a top view by the side of the back substrate in other examples of an image display device of the present invention. It is sectional drawing of the DD line | wire of FIG. It is sectional drawing of the EE line | wire of FIG. It is a top view by the side of the back substrate in the further another Example of the image display apparatus of this invention. It is sectional drawing of the FF line of FIG. It is sectional drawing of the GG line of FIG. It is a partially notched top view of the other Example of the image display apparatus of this invention. It is process drawing explaining the manufacturing method of the image display apparatus of this invention. It is process drawing of the other example explaining the manufacturing method of the image display apparatus of this invention. It is principal part sectional drawing which shows the structure of the conventional image display apparatus. FIG. 22A is an enlarged view showing the positional relationship between the opening of the control electrode of the image display device shown in FIG. 21 and the electron source on the cathode wiring, FIG. 22A is a cross-sectional view, and FIG. 22B is a plan view. It is principal part sectional drawing which shows the other structure of the conventional image display apparatus. It is a principal part expanded sectional view which shows the structure of the A section of FIG. It is a top view of the back panel which shows schematic structure of the conventional field emission type image display apparatus.

Explanation of symbols

12 Front substrate 13 Back substrate 14 Hermetic seal 141 Support 142 Seal member 15 Spacing member (spacer)
151 Fixing material 16 Cathode wiring 17, 36 Control electrode 17a Electron passage hole 18, 34 of control electrode Acceleration electrode 18a Electron passage hole 181 of acceleration electrode Mesh substrate 182 Through hole 19, 35 Insulating layer 19a Opening 23 of insulating layer, 33 Grit electrode assembly 24 Second insulating layer 25 Fixing material 26 Electron source 27 Phosphor screen 28 Metal back film (anode)
29 Phosphor film 345 Spacer holding hole 345a Spacer holding hole protrusion

Claims (7)

A front substrate having an anode and a phosphor on its inner surface;
A plurality of cathode wirings extending in one direction and juxtaposed in the other direction intersecting the one direction, and a plurality of electron sources arranged in electrical conduction on the cathode wiring are provided on the inner surface. A back substrate facing the front substrate with a predetermined interval;
A control electrode having an electron passage hole interposed between the back substrate and the front substrate and passing electrons from the electron source to the front substrate side in a display area;
An accelerating electrode that is interposed between the control electrode and the front substrate and has an electron passage hole that passes electrons that have passed through the electron passage holes of the control electrode, and that accelerates electrons that pass through the electron passage hole;
A plurality of spacing members disposed in the display area between the front substrate and the back substrate, for holding the predetermined spacing;
A support body that is inserted around the display area between the front substrate and the rear substrate, and holds the predetermined distance;
An image display device formed by hermetically sealing the end surface of the support and the front substrate and the rear substrate via sealing members,
One of the control electrode and the acceleration electrode has an electrode configuration including a conductive mesh substrate.   The image display apparatus according to claim 1, wherein the mesh-shaped substrate is made of a mesh plate.   3. The image display device according to claim 1, wherein the mesh-like base material has a through hole through which the spacing member is passed.   4. The through hole that penetrates the gap holding member of the mesh-like base material includes a narrow portion that is forcibly fitted to the gap holding member. Image display device.   5. The spacing member according to claim 1, wherein the spacing member is disposed through a thin portion of a portion of the mesh substrate where the spacing member is disposed. Image display device. A front substrate having an anode and a phosphor on its inner surface;
A plurality of cathode wirings extending in one direction and juxtaposed in the other direction intersecting the one direction, and a plurality of electron sources arranged in electrical conduction on the cathode wiring are provided on the inner surface. A back substrate facing the front substrate with a predetermined interval;
A control electrode having an electron passage hole interposed between the back substrate and the front substrate and passing electrons from the electron source to the front substrate side in a display area;
An accelerating electrode that is interposed between the control electrode and the front substrate and has an electron passage hole that passes electrons that have passed through the electron passage holes of the control electrode, and that accelerates electrons that pass through the electron passage hole;
A plurality of spacing members disposed in the display area between the front substrate and the back substrate, for holding the predetermined spacing;
A support body that is inserted around the display area between the front substrate and the rear substrate, and holds the predetermined distance;
Manufacturing an image display device in which the end face of the support and the front substrate and the rear substrate are hermetically sealed via sealing members, respectively.
A step of forming the accelerating electrode by covering the one surface of a conductive mesh-like substrate with an insulating layer except for the electron passage holes, and disposing the insulating layer side of the accelerating electrode facing the cathode wiring side. A method for manufacturing an image display device, comprising: a step of incorporating into a predetermined portion between the front substrate and the rear substrate.   A control electrode having an electron passage hole coaxial with the electron passage hole is formed on the insulating layer opposite to the acceleration electrode, and the front electrode and the rear substrate are arranged so as to face the cathode wiring side. The method for manufacturing an image display device according to claim 6, further comprising a step of incorporating the image display device into a predetermined portion between the two.

Images