JP2617475B2 - Method of manufacturing gas discharge display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a gas discharge display device, and more particularly to a method for manufacturing a full color gas discharge display device suitable for high resolution, high brightness, and a large screen.

[Prior Art] In a gas discharge display device, an enclosed gas is ionized in a discharge space, and information is obtained by light emission of the ionized gas itself or fluorescence generated by irradiating a phosphor with ultraviolet rays or electrons generated by the ionized gas. Is displayed. Therefore, in manufacturing the gas discharge device, the production technology of the discharge space structure occupies an important position.

FIG. 1 is a schematic view of a cross section of a gas discharge display device utilizing light emission of a phosphor. The device has a structure in which a discharge space constituting body 2 in which discharge cells are arranged in a matrix is sandwiched between a display panel 4 on which an anode 3 is formed and a substrate 6 on which a cathode 5 is formed. The phosphor 7 is applied to the wall surface of the discharge space groove formed body 2. Further, the periphery of the discharge cell 1 is sealed, and Xe, Ne, or a mixed gas thereof is sealed in the discharge cell 1 as a discharge gas. In this type of gas discharge display device, a voltage is applied between the anode 3 and the cathode 5 to generate ultraviolet rays in the discharge gas, thereby causing the phosphor to emit light to display information.

There is also a gas discharge display device of a type in which a fluorescent substance is not applied to the wall of the discharge space constituting member 2 and information is simply displayed by the emission of the discharge gas itself.

As is clear from the above description, in the gas discharge device, the brightness and resolution of the display greatly depend on the shape of the discharge space. That is, in manufacturing the gas discharge display device, the manufacturing technology of the discharge space structure occupies an important position. In particular, a high-quality full-color gas discharge television is required to have a large screen, high luminance, and high resolution, and therefore requires a high-precision discharge space structure manufacturing technology.

For example, here, the structure of a discharge space structure assuming a 40-inch size full-color gas discharge television is as follows.The shape of a discharge cell having sufficient brightness for practical use is about 0.8 m.
It is a rectangular parallelepiped space having an m-square and a depth of 1.5 to 2 mm. The discharge space structure has a structure in which 480 discharge cells are arranged vertically and 800 cells are arranged horizontally via a partition wall.

The number of cells and the like are for the case of an image in the current NTSC standard mode, and a high-definition television expected to be put to practical use in the future requires high-definition by miniaturizing the discharge cells. The number needs to be increased. On the other hand, the number of discharge spaces reaches several hundred thousand in a full-color gas discharge television having a diagonal of 40 inches as described above, so that a processing method with high productivity is required.

The discharge space of the conventional gas discharge display device is roughly formed by the following two methods.

The first method is a method in which a through hole is formed in a material by etching and laser irradiation, and the through hole is used as a discharge space.

In the etching method, side etching occurs, so the cross-sectional shape is not constant, and the thickness of the workable material is the hole diameter of 1 m
When the length is set to about m, there is a problem that the diameter becomes about 0.3 mm or less.

In the case of drilling by laser irradiation, there is a problem that damage remains around the hole, and it is impossible to process with glass having a low melting point.

In the second method, a discharge space is formed by a thick film process. In this method, a thick film such as glass or ceramics is formed by a thick film process such as screen printing to form a discharge space, but each parameter (skidge pressure, drying time, etc.) when performing overprinting is determined. It needs to be managed enough. The depth of the discharge space that can be formed by one thick film process is about 0.05 mm, and the number of times of overprinting can be tens of times. Normally, in the thick film process, the productivity is low because the processes that require a long time, such as drying, baking, and annealing processes, are repeated, and the process is repeated. Position repeatability became a problem.

Furthermore, it is difficult to uniformly apply the phosphors of three colors to the discharge space partition walls formed by any of the above methods, and this has been a factor of reducing productivity.

[Problems to be Solved by the Invention] The above-mentioned prior art is not sufficiently considered as a technique for forming a discharge space of a gas discharge display device such as a full color television, and has a large screen and a high height. There have been problems in terms of high-precision discharge space construction technology aimed at luminance and high resolution, machining, and productivity.

An object of the present invention is to achieve high brightness, high rigidity, high productivity, high quality, low It is an object of the present invention to provide a method for manufacturing a gas discharge display device at a low cost.

[Means for Solving the Problems] The object of the present invention is to use a foil plate as a material of a gas discharge space structure, apply an adhesive to a surface of the foil plate at a predetermined interval, laminate the foil plate, and pressurize. This is achieved by forming a gas discharge space by forming a honeycomb core after performing bonding and then expanding.

[Operation] FIGS. 2A to 2E schematically show a manufacturing process of the discharge space constituting body of the present invention.

The material foil plate 22 whose short dimension is the discharge space constituting body, that is, the material foil plate 22 having the wall thickness t of the discharge cell 21 is cut so that the dimension in the short direction is the size T in the thickness direction of the discharge cell 21. A bonding agent 23 is applied at desired intervals, and the foil plates are laminated, pressed, and joined to form a laminated block 24. Thereafter, the laminated block 24 is extended in the laminating direction, that is, in the direction of the arrow 25, to form the honeycomb core 26. In the honeycomb core 26, spaces are arranged in a matrix in a regulated manner. This space is the cell size W of the honeycomb core 26, which is the size of the discharge cell 21. The dimensions of the discharge cell 21 are determined by the application interval of the bonding agent 23,
Further, it is determined by the degree of extension of the laminated block 24. Further, the cell shape of the honeycomb core 26, that is,
The shape of the discharge cell 21 is hexagonal or rectangular depending on the degree of expansion. When the gas discharge display device requires light emission by a phosphor, the phosphor is applied to the inner wall of the discharge cell 21.

Further, the dimension in the short direction of the material foil plate 22 may be larger than the dimension T in the thickness direction of the discharge cell 21, and the material foil plate is used to laminate, press, and join in the same manner as described above. Alternatively, the discharge cells 21 may be cut so as to have the dimension T in the thickness direction.

At this time, when assembled on the gas discharge display panel, fine grooves 27 necessary for filling discharge gas are provided on the end face of the laminated block 24, or fine holes 28 are provided on the laminated block 24. Second
An enlarged view of the laminated block 24 in FIG. (C) shows an example of groove processing and an example of fine hole processing.

Embodiment of the Invention Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 (a) to 3 (e) and FIG.

In the gas discharge display device, in order to obtain stable gas discharge characteristics, it is preferable that the discharge space structure is formed of an insulator, and when the discharge space structure is formed of a conductive material, an insulating layer is formed on the surface of the discharge space structure. In addition, it is necessary to perform insulation treatment corresponding to the discharge voltage.

In this example, an aluminum foil plate was used as a material for constituting a discharge space, and the insulating layer on the surface was an alumite film formed by anodizing aluminum.

3 (a) to 3 (e), the discharge cells 32 which are discharge space components 31 are schematically shown in the manufacturing process of the discharge space components.
In consideration of the increase in the effective light emitting display area of the gas discharge display device, the mechanical rigidity of the discharge cell 32, and the ease of precision molding, a discharge space structure was formed by the following method. That is, the aluminum foil plate 33 having a wall thickness of the discharge cell 32 of 0.05 mm is used, and both surfaces of the aluminum foil plate 33 are anodized so that the entire aluminum foil plate 33 becomes an insulator of Al ₂ O _3. Performed alumite treatment. The specific resistance at this time is
4 × 10 ¹⁵ Ohm.cm is obtained in a dry state at normal temperature, and the dielectric breakdown voltage is 10 to ¹⁴ V / μm. As described above, the bonding agent 34 is applied at a desired interval on the surface of the insulated aluminum foil plate 33, and the phosphor 35 is applied between the applied bonding agents 34. Similarly, the phosphor 35 is also applied to the back surface of the aluminum foil plate 33 except for the joint. In the case of a full-color gas discharge display device, the application of the phosphor 35 is applied to the emission color (R,
In accordance with the color arrangement of (G, B), it is applied so as to have an RGB horizontal triangle arrangement.

This aluminum foil plate 33 is laminated in the thickness direction,
Bonding is performed to form a laminated block 36. Thereafter, the thickness T of the discharge cell 32 is cut into 2 to 3 mm to form a slice block 37. The slice blocks 37 are extended in the stacking direction, that is, in the direction of the arrow 38, to form the discharge cells 32. The size and shape of the discharge cell 32 are determined by the application interval of the bonding agent 34 and the degree of expansion of the slice block 37, as is apparent from the above. Conversely, it is also possible to perform anodic oxidation after stretching, but in this case, a step of applying a phosphor of three primary colors to the inner wall of the formed discharge cell is required.

In the present embodiment, a full-color gas discharge display device having a diagonal of 40 inches is assumed, and the shape of the discharge cells 32 is hexagonal, with a horizontal pitch of 1 mm and a vertical pitch of 1.25 mm. It has a structure in which 800 cells and 480 cells in the vertical direction are arranged.

FIG. 4 is a bird's-eye view showing the structure of the gas discharge display device according to the present embodiment. In the figure, a discharge space structure 31 in which discharge cells 32 are regularly arranged in a matrix is sandwiched between a display panel 39 and a substrate 40, and the periphery of the discharge cell 32 is sealed except for a part of a gas flow passage. ing. Display board
A band-shaped anode 41 is formed on 39, and a band-shaped cathode 42 is formed on the substrate 40 so as to be orthogonal to the anode 41, similarly to the anode 41. The discharge cells 32 are filled with Xe, Ne, or a mixed gas thereof.

In this type of gas discharge display device, when a voltage of about 250 V is applied between the anode 41 and the cathode 42, the discharge is excited, a negative glow or a positive column is spread, ultraviolet rays are generated in the discharge gas, and the discharge gas is applied to the discharge cells 32. The displayed phosphor 35 emits light to display information.

Further, the wall of the discharge space constituting body 31, that is, the discharge cell 32
There is also a gas discharge display device in which information is displayed simply by the emission of the discharge gas itself without applying the phosphor 35 to the inner wall of the gas discharge display.

In the example, the aluminum foil plate which is a metal foil plate was subjected to anodization of aluminum to form an alumite film and subjected to insulation treatment of the discharge space constituting body, but an insulating material such as ceramics was applied to the surface of the metal foil plate. An insulating layer is formed by thermal spraying, plating, coating, or the like, and a gas discharge display device can be similarly obtained.

Further, even if the gas discharge space constituting member is formed of an inorganic material foil plate such as glass or ceramics, or formed of an organic material foil plate such as plastics, the gas discharge display device can be formed in the same manner as in the present embodiment. It goes without saying that it is possible to obtain

In FIG. 4 showing this embodiment, the discharge electrode is a display panel.
A strip-shaped anode 41 was formed on the substrate 31, and a strip-shaped cathode 42 was formed on the substrate in the same manner as the anode 41. The discharge electrode or the wiring pattern was formed on the aluminum foil plate 33 of the discharge space constituting member 31 with the phosphor 35. Like the bonding agent 34 and the bonding agent 34, it can be formed in advance.

Further, when the slice block 37 is extended in the stacking direction to form the discharge space constituting body 31, that is, the discharge cell 32,
As shown in FIG. 4, not only the display plate 39 having a flat surface, but also a concave discharge space structure 52, which is matched with and extended to the concave display plate 51 as shown in FIG. As shown in FIG. 5, it is possible to form a convex-shaped discharge space constituting member 62 that is extended in conformity with the convex-shaped display plate 61,
It is possible to provide a gas discharge display device that prevents reflection on the display surface and has an angle of view that is easy to see.

As described above, in the gas discharge display device, in order to obtain stable discharge characteristics, a shaping unit having no variation in the shape of the discharge space is required, and the luminance and resolution of the display greatly depend on the shape of the discharge space. . In particular, a high-quality full-color gas discharge display device requires a large screen, high luminance, and high resolution, and therefore requires a high-precision discharge space creation technique.

According to the present embodiment, there is no variation in the shape of the discharge space, and a high-precision discharge space structure can be manufactured with high productivity. As a result, stable discharge characteristics were obtained, and the screen brightness was confirmed to be about 150 fL, sufficient for practical use, and there was no crosstalk between display cells, and a large-screen, high-quality, full-color gas discharge display device was realized. It became possible to realize.

[Effects of the Invention] As described above, according to the present invention, it is possible to manufacture a discharge space component of a gas discharge display device with high accuracy and high productivity, and to achieve high image quality of the gas discharge display device. And cost reduction can be achieved. In particular, it is effective for realizing a wall-mounted, large-screen, high-quality, full-color, high-definition television that has been desired to be developed in recent years.

[Brief description of the drawings]

1 is a schematic view of a cross section of a gas discharge display device, FIGS. 2 and 3 are schematic views of a manufacturing process of a discharge space structure according to the present invention, and FIG. 4 is a structure of the gas discharge display device according to the present invention. FIG. 5 is a diagram showing a concave gas discharge display device according to the present invention, and FIG. 6 is a diagram showing a convex gas discharge display device according to the present invention. 31 discharge space constituent body, 32 discharge cell, 33 aluminum foil plate, 34 bonding agent, 35 phosphor, 39 display panel, 40 substrate, 41 anode, 42 ... a cathode, 51 ... a concave display panel, 52 ... a concave discharge space structure, 61 ... a convex display panel, 62 ... a convex discharge space structure.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kozo Toda 1-280 Higashi-Koigabo, Kokubunji-shi, Tokyo Inside the Central Research Laboratory, Hitachi, Ltd. (72) Inventor Shigeo Kato 1-280 Higashi-Koigabo, Kokubunji-shi, Tokyo Hitachi, Ltd. Inside the Central Research Laboratory (72) Inventor Masakazu Fukushima 1-280 Higashi Koigabo, Kokubunji-shi, Tokyo Inside the Central Research Laboratory Hitachi, Ltd. (72) Inventor Kazue Imagawa 1-1280 Higashi-Koigabo, Kokubunji-shi, Tokyo Within Central Research Laboratory, Hitachi, Ltd. (72) Inventor Shinichi Shinada 1-280 Higashi Koigakubo, Kokubunji-shi, Tokyo Inside Central Research Laboratory, Hitachi, Ltd.

Claims (9)

(57) [Claims] 1. A method for manufacturing a gas discharge display device comprising a step of sealing a gas discharge space structure except for a gas flow passage, wherein said gas discharge space structure is formed by laminating a plurality of foil plates and pressing the foil plates to a predetermined pressure. A method for manufacturing a gas discharge display device, characterized in that the gas discharge display device is formed by adhering portions and then extending in the laminating direction. 2. The method according to claim 1, wherein the foil plate is an insulating inorganic material foil plate or an organic material foil plate. 3. The method for manufacturing a gas discharge display device according to claim 1, wherein the foil plate is formed by coating a surface of a metal foil plate with an insulating material. 4. The method according to claim 1, wherein the foil plate is an aluminum foil plate having an insulating layer formed on the entire surface or by anodic oxidation. 5. The method of manufacturing a gas discharge display device according to claim 1, wherein a phosphor is applied to the front and back surfaces of the foil plate at predetermined intervals. 6. The method for manufacturing a gas discharge display device according to claim 1, wherein a discharge electrode or a wiring pattern is formed on the foil plate. 7. The method for manufacturing a gas discharge display device according to claim 1, wherein a groove or a hole for charging discharge gas is provided in the foil plate. 8. The gas discharge display device according to claim 1, wherein the shape of the display surface of the gas discharge space constituting member conforms to the shape of the display surface of the gas discharge display device. Manufacturing method. 9. The expansion of a plurality of laminated foil plates in the laminating direction is performed by changing the display cross-sectional shape of the gas discharge space constituting member to a honeycomb shape.
The method for manufacturing a gas discharge display device according to any one of claims 1 to 8, wherein the gas discharge display device is extended so as to be a core.