JP2002367545A - Wire-grid type fluorescent character display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent character display tube enabling the use of an inexpensive wire grid of simple structure, enabling the wire grid to be easily attached, being excellent in grid selectability, having a high display quality, and being suited for thinning and for a high-definition display. SOLUTION: An anode 21 and a grid wire 25 or the like are formed on an anode base 11 made of glass and an insulating film 23 is deposited thereover, with the wire grid 24 secured to the insulating film 23. The wire grid 24 has a conductive film 242 formed around a glass fiber 241. A phosphor film 22 is formed on the anode 21 inside an opening 231 in the insulating film 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a wire grid type fluorescent display tube.

[0002]

2. Description of the Related Art A conventional wire grid type fluorescent display tube will be described with reference to the drawings. FIG. 5 is an example of a type in which a wire grid is stretched in space using a spacer. FIG. 5A is a plan view of an anode substrate (part) to which a wire grid is attached, and FIG. 5B is a plan view of FIG.
It is sectional drawing of X1-X1 part of. An anode electrode 56 is formed on a glass anode substrate 51, and a phosphor is applied to the anode electrode 56 in a dot shape to form a phosphor layer 57. Between the cathode filament (not shown) and the anode electrode 56, a phosphor layer 5 is provided from the cathode filament.
7, a wire grid 54 for controlling electrons emitted to the wire 7 is stretched.
5 is maintained at a predetermined height. Both ends 541 (only one is shown) of the wire grid 54 are fixed by frit glass (not shown) while being sandwiched between the anode substrate 51 and the side plate 52. 53 is
It is a side plate.

[0003] The wire grid 54 includes a frame 543.
Is fixed on a special jig and stretched tightly.
5, the positioning is performed, and the side plate 52 is pushed down as shown in FIG. 5B so as to be sandwiched and fixed between the substrate 51 and the side plate 52. Therefore, the work of attaching the wire grid 54 becomes complicated. The wire grid 54 is made of a material having a thermal expansion coefficient substantially equal to that of glass of the substrate or the like in order to prevent the occurrence of cracks in the substrate or the like due to thermal expansion.
Six alloys or the like are used, and a plate of the alloy is formed by etching. Further, the wire grid 54 is cut at the half-etched portion 542 after fixing, and separated from the frame 543. The separated frame 543 is discarded. Therefore, the material cost and processing cost of the wire grid 54 increase. Further, since the wire grid 54 is stretched in a space, it may be in contact with another electrode or the like due to deflection due to vibration or thermal expansion, and therefore cannot be arranged close to the other electrode or the like. Therefore, the wire grid 54 hinders the thinning of the fluorescent display tube. Further, since it is difficult to arrange the wire grid 54 at high density, it is difficult to display a fluorescent display tube with high definition.

In order to address the problems of the fluorescent display tube of FIG. 5, a fluorescent display tube of FIG. 6 has been proposed. FIG. 6 (a)
: Anode substrate with wire grid (part)
6B is a cross-sectional view taken along the line X2-X2 in FIG. 6A. The anode electrode 6 is provided on the anode substrate 61.
6, an insulating layer 65 and a grid 64 of a metal film are sequentially laminated,
A phosphor layer 67 is formed on the insulating layer 65 and the anode electrode 66 in the openings 651 and 641 of the grid 64. 62 and 63 are side plates. The height of the grid 64 is
It is determined by the height (layer thickness) of the insulating layer 65. Grid 64
Is in close contact with the insulating layer 65, so that there is no problem such as vibration of the wire grid 64 in FIG.

[0005] In a fluorescent display tube, the grid is generally arranged at a position higher than the phosphor layer in order to increase the selectivity of the grid. In the case of FIG. 6, the thickness of the insulating layer 65 is formed to be, for example, about 200 μm with respect to the layer thickness of the phosphor layer 67, for example, 10 to 40 μm, and the upper surface of the grid 64 is made higher than the upper surface of the phosphor layer 67. Is also located at a higher position. The insulating layer 65 is generally formed by a screen printing method when the layer thickness is about 200 μm. However, when the layer thickness is about 200 μm, printing must be repeated 10 times or more. Takes a long time. In addition, since the insulating layer 65 is located at a position higher than the phosphor layer 67, the phosphor layer 67 is affected by the charge of the insulating layer 65, causing display chipping and deteriorating display quality.

Therefore, in order to improve these points, a fluorescent display tube having the structure shown in FIG. 7 can be considered. FIG. 7 is a cross-sectional view of a modification of the fluorescent display tube of FIG. 6 and corresponding to FIG. 6B. The same reference numerals as in FIG. 6 are used. In the case of FIG. 7, the anode electrode 66, the insulating layer 65, and the grid 64 are all formed as thin films. However, since the insulating layer 65 is thin (low), electrons fly from the upper surface of the phosphor film 67 (cathode filament not shown). Is higher than the grid 64. As a result, the selectivity of the grid 64 deteriorates.

In the case of FIGS. 6 and 7, the grid 64 is
Since a metal film such as aluminum is laminated on the insulating layer 65 and the metal film must be processed into a predetermined shape by a photolithography method, the process becomes complicated and the processing cost increases.

[0008]

FIG. 5, FIG. 6, and FIG.
It solves the problems of the fluorescent display tube having the structure shown in FIG. 7 and can easily mount an inexpensive wire grid, has excellent grid selectivity, has little influence of charging of the insulating layer, has a simple structure, and is thin. It is an object of the present invention to provide a fluorescent display tube suitable for high-definition display.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a wire grid type fluorescent display tube in which an anode electrode on which a dot-like phosphor film is formed and a wire grid intersect with each other. An insulating film covering the anode electrode, a wire grid fixed on the insulating film, the insulating film has an opening through which the dot-shaped phosphor film protrudes, and the wire grid is a conductive film on the entire peripheral surface of the glass fiber. Is formed. The present invention relates to a wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor film is formed and a wire grid are arranged to intersect with each other. It consists of a support member for the formed wire grid and a wire grid fixed on the support member, and the wire grid has a conductive film formed on the entire peripheral surface of the glass fiber. In a wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor film is formed and a wire grid intersect with each other, a wire grid has a conductive film formed on one surface of a glass fiber, and the glass fiber is formed on a substrate. The wire grid is arranged and fixed so as to be in contact with the anode electrode formed above. The present invention provides a wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor layer is formed and a wire grid intersect with each other, wherein the wire grid has an insulating film formed on one surface of a metal wire. The wire grid is arranged and fixed so that the insulating film is in contact with the anode electrode formed on the substrate. The present invention provides a wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor layer is formed and a wire grid intersect with each other, wherein the wire grid has an oxide film formed on one surface of a metal wire. The wire grid is arranged and fixed so that the oxide film is in contact with the anode electrode formed on the substrate.

[0010]

FIG. 1 is a plan view and an enlarged sectional view of an anode substrate (part) of a wire grid type fluorescent display tube according to a first embodiment of the present invention. FIG. 1 (a)
FIG. 1B is an enlarged sectional view of a Y1-Y1 portion of FIG. 1A, and FIG. 1C is an enlarged sectional view of a Y2-Y2 portion of FIG. In FIG. 1, reference numeral 11 denotes an anode substrate having an infinite distance such as glass or ceramic;
3 is a side plate made of glass or the like, 21 is an anode electrode, 211 is an anode wiring portion of the anode electrode, 22 is a dot-like phosphor film formed on the anode electrode 21, and 23 is an insulating film (S
iOx, SiN, etc.), 231 an opening, 24 a wire grid, and 25 a grid wiring. Anode electrode 2
1 and the wire grid 24 are arranged orthogonally. The anode electrode 21 is made of aluminum, ITO, or the like, and the grid wiring 25 is made of aluminum. The wire grid 24 includes a conductive film 24 of aluminum, copper, nickel, ITO, or the like on the entire peripheral surface of the glass fiber 241.
2 is formed.

An anode electrode 21, an anode wiring portion 211, and a grid wiring 25 are formed on a substrate 11, and an insulating film 23 is laminated thereon. Opening 2 of insulating film 23
A phosphor film 22 is formed on an anode electrode 21 in 31. The wire grid 24 is disposed at a predetermined distance from the phosphor film 22 in a direction orthogonal to the anode electrode 21 (it is not limited to 90 ° and may intersect), and is fixed to the insulating film 23 by frit glass or the like. I have. The conductive film 242 of the wire grid 24 is electrically connected to the grid wiring 25 by the conductive material of the through hole 232 of the insulating film 23. The connection between the conductive film 242 and the grid wiring 25 is not limited to the through hole, and for example, both may be connected by ultrasonic wire bonding.

The anode electrode 21, the grid wiring 25, the insulating film 23, etc. are each formed of a thin film and can be formed by a known thin film forming method. For example, the anode electrode 21 and the grid wiring 25 are formed by sputtering, and the insulating film 23 is formed by CV.
It can be formed by Method D. The phosphor film 22 is formed by a slurry method,
It can be formed into a thick film by screen printing or the like.

The thickness of the anode electrode 21 is 0.5-2.
The thickness of the insulating layer 23 may be about 0.2 to 10 μm, and the thickness of the phosphor film 22 may be about 10 to 30 μm. The diameter of the wire grid 24 varies depending on the thicknesses of the insulating film 23 and the phosphor film 22.
Is selected to be, for example, about 50 μm so that the upper surface (the side from which electrons fly from a cathode filament (not shown)) is higher than the upper surface of the phosphor film 22. The phosphor film 22
One having a size of 150 μm × 150 μm is arranged at a distance of 250 μm, and the wire grid 24 is arranged at a distance of 50 μm from the phosphor film 22. When the diameter of the wire grid 24 is 50 μm, the distance from the anode electrode 21 to the upper surface of the wire grid 24 is 50 μm.
3, which is larger than the thickness (10 to 30 μm) of the phosphor film 22. Therefore, the upper surface of the wire grid 24 is higher than the upper surface of the phosphor film 22.

The wire grid 24 of the present embodiment is
Because the conductive film is formed on glass fiber,
Since the structure is simple, it can be manufactured at a low cost, and can be directly fixed to the insulating film 23 without using a special jig, the attachment of the wire grid becomes extremely simple. Since the height of the upper surface of the wire grid 24 is defined by the diameter of the wire grid 24 and is not defined by the height of the insulating film 23 as in the prior art, the anode electrode 21, the grid wiring 25, and the insulating film 23 are each formed of a thin film. , The wire grid 24 can be arranged at a position higher than the phosphor film 22. Therefore, the selectivity of the wire grid 24 increases. Further, since the insulating film 23 is located at a position lower than the phosphor film 22, the phosphor film 22 does not cause display defects or the like due to charging of the insulating film 23.

Since the wire grid of the present embodiment uses glass fiber as its material, its thermal expansion coefficient is the same as that of the glass substrate 11 or the like. Accordingly, the substrate 11 does not crack or warp due to the thermal expansion of the wire grid. In this embodiment, since the anode electrode 21, the grid wiring 25, and the insulating film 23 can be formed as thin films, respectively, the thickness of the fluorescent display tube can be reduced and a high-definition display can be performed.

In this embodiment, an example is described in which the insulating film 23 is formed on substantially the entire surface of the anode substrate 11 as a grid support member. However, the insulating film may be formed only on the portion where the wire grid 24 is arranged. Then, a columnar or island-shaped insulating film may be formed along the wire grid 24 and used as a support member for the wire grid 24. It is also possible to form a conductive film along the wire grid 24 and between the anode electrodes while keeping the anode electrode insulated (at a distance from the anode electrode). In this embodiment, the wire grid 24 is directly fixed to the insulating film 23. However, a metal film such as aluminum is formed on the insulating film 23 and the like, and the wire grid 24 is fixed to the metal film by ultrasonic welding. Can also. Alternatively, it is also possible to use a metal piece such as aluminum for welding, hold the wire grid 24 between the metal piece and the metal film, and fix the metal piece to the metal film by ultrasonic welding.

FIG. 2 is a plan view and an enlarged sectional view of an anode substrate (part) of a wire grid type fluorescent display tube according to a second embodiment of the present invention. 2A is a plan view, FIG. 2B is an enlarged sectional view of a Y3-Y3 portion of FIG. 2A, and FIG. 2C is a sectional view of a Y4-Y4 portion of FIG. It is an expanded sectional view. In FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 34 is a wire grid,
341 is a glass fiber, and 342 is a conductive film. The anode electrode 21 and the wire grid 34 are arranged to be orthogonal. The wire grid 34 is formed with a conductive film 342 made of aluminum, ITO, or the like, except for one surface of the glass fiber 341 on the side in contact with the anode electrode 21. It is preferable that the conductive film 342 be formed in a range as wide as possible without the conductive film 342 being in contact with the anode electrode 21.

The wire grid 34 is disposed by directly contacting the glass fiber 341 with the anode electrode 21 and is fixed by frit glass or the like. The conductive film 342 of the wire grid 34 is electrically connected to the grid wiring 25 by the lead wire 31. Lead wire 31
Are ultrasonically welded to the conductive film 342 and the grid wiring 25 at both ends.

In this embodiment, a glass fiber 341 is used.
Is used as an insulating material between the anode electrode 21 and the conductive film for grid 342, and no equivalent to the insulating film in FIG. 1 is provided. And the manufacturing process is simplified. Other Figure 1
It has the same effect as.

1 and 2 can be formed by a PVD method, a vapor deposition method, a sputtering method, or a method of applying an organic metal material such as an alkoxide. Is preferably a PVD method. FIG.
FIG. 3 is a diagram illustrating a method of forming a conductive film of the wire grid of FIG. 2 by a PVD method. FIG. 3A is a plan view,
FIG. 3B is a cross-sectional view taken along the line Y5-Y5 of FIG. In FIG. 3, glass fibers 421 are arranged on the alignment plate 41 without gaps, and a conductive film 422 is formed on the glass fibers 421 by metal particles such as aluminum flying from the arrow direction. At this time, since there is no gap between the glass fibers 421, the metal particles
21 is not attached to the alignment plate 41 side. Therefore, in the glass fiber 421, the conductive film 422 is formed on substantially one surface on the side where the metal particles fly.

FIG. 4 is a sectional view of an anode substrate (part) of a fluorescent display tube to which a wire grid according to an embodiment other than FIGS. 1 and 2 is attached. 1 and 2 are denoted by the same reference numerals.

FIG. 4A shows an example in which a metal wire such as aluminum is used for the wire grid and an insulating film is formed on a part of the metal wire. Is formed. The insulating film 442 is formed by, for example, a screen printing method. Insulating film 442
It is preferable that the metal wire 441 be formed in a range as small as possible without contact with the anode electrode 21. The material of the wire grid 44 is a metal wire.
Since the insulating film 442 is interposed between the anode electrode 21 and the anode electrode 21, the insulating layer 442 is not laminated on the anode electrode 21,
The wire grid 44 can be directly fixed to the anode electrode 21. Therefore, the structure of the fluorescent display tube and the installation of the wire grid are simplified. The insulating film is
The metal wire 441 is linearly formed on one surface, but may be partially formed into, for example, an island shape if insulation from the anode electrode 21 is obtained.

FIG. 4B shows an example in which a metal wire such as aluminum is used for the wire grid and an oxide film is formed on a part of the metal wire. One side of the metal wire 451 of the wire grid 45 on the anode electrode 21 side is shown. An oxide film 452 is formed on the substrate. The oxide film 452 is formed by, for example, an anodic oxidation method. It is preferable that the oxide film 452 be formed in a range as small as possible within a range where the non-oxidized portion of the metal line 451 does not contact the anode electrode 21. The material of the wire grid 45 is
Although a metal wire is used, an oxide film 452 intervenes between the non-oxidized portion of the metal wire 451 and the anode electrode 21.
As in (a), the wire grid 44 can be directly fixed to the anode electrode 21 without laminating an insulating layer on the anode electrode 21. Therefore, the structure of the fluorescent display tube and the installation of the wire grid are simplified. Note that the oxide film 452 may be linear in shape along the wire grid 45 or partially formed in an island shape or the like.
In the case of FIG. 4, since there is no insulating film, there is no influence of the charge of the insulating film.

In each of the above embodiments, two wire grids are provided between the phosphor films, but may be one. Although the wire grid according to each of the above embodiments has been described as having a circular cross-sectional shape, the wire grid may have a shape other than a circle, such as a semicircle or a polygon.

In each of the embodiments described above, the example in which the phosphor film is formed in a dot shape on the strip-shaped anode electrode arranged in the direction intersecting with the wire grid, but the independent anode electrode is provided for each dot-shaped phosphor film. May be arranged in a direction crossing the wire grid. Therefore, in the present invention, an anode electrode intersecting the wire grid is referred to, including a plurality of anode electrode rows arranged in a direction intersecting the wire grid.

[0026]

The wire grid of the present invention is made of metal wire or glass fiber, so that it is inexpensive. Further, since the wire grid is directly fixed to the insulating film, the anode electrode, or the like without being stretched in a space by a special jig, there is no problem of vibration or bending, and the mounting of the wire grid is simplified. Since the present invention separately manufactures a wire grid as a component and attaches the separately manufactured product to an insulating film or the like, a metal film is laminated on an insulating layer formed on a conventional anode substrate or the like, and the metal layer is formed by a photolithographic method. Processing cost is lower than that of processing into a predetermined shape.

According to the present invention, the anode electrode, the grid wiring, the insulating film and the like can be formed in a thin film. Therefore, in combination with the structure of the wire grid of the present invention, the fluorescent display tube can be made thin and high-definition display can be performed. . Further, even if the insulating film is a thin film, the upper surface of the grid can be arranged at a position higher than the upper surface of the phosphor film, so that a fluorescent display tube with excellent grid selectivity and high display quality without display defects can be realized. .

Since the insulating film of the present invention is a thin film, it is not necessary to repeat screen printing many times. Therefore, the formation of the insulating film is simplified, and the influence of the charging of the insulating film is reduced because the insulating film is located at a position lower than the upper surface of the phosphor film. In addition, the present invention, as a wire grid,
A wire grid can be directly fixed to an anode electrode by using a conductive film formed on one surface of a glass fiber or an insulating film or an oxide film formed on one surface of a metal wire, so that an insulating film is laminated on the anode electrode. No need. Therefore, in this case, the influence of the charge is further reduced.

[0029]

[Brief description of the drawings]

FIG. 1 is a plan view and a sectional view of an anode substrate (part) of a fluorescent display tube according to a first embodiment of the present invention.

FIG. 2 is a plan view and a sectional view of an anode substrate (part) of a fluorescent display tube according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a method for forming an insulating film of a wire grid according to the present invention.

FIG. 4 is a sectional view of an anode substrate (part) of a fluorescent display tube to which a wire grid according to an embodiment other than FIGS. 1 and 2 is attached.

FIG. 5 is a plan view and a sectional view of an anode substrate (part) of a conventional fluorescent display tube.

FIG. 6 shows another conventional anode substrate of a fluorescent display tube (part).
1 is a plan view and a sectional view of FIG.

7 is a sectional view of a fluorescent display according to a modification of the fluorescent display of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Anode substrate 12, 13 Side plate 21 Anode electrode 211 Wiring part of anode electrode 22 Phosphor film 23 Insulating film 231 Opening 232 Through hole 24, 34, 44, 45 Wire grid 241, 421 Glass fiber 242, 342, 422 Conductivity Film 25 Grid wiring 41 Alignment plate 441, 451 Metal wire 442 Insulating film 452 Oxide film

Continued on front page (72) Inventor Hiroaki Kawasaki 629 Futaba Electronics Industry Co., Ltd. Futaba Electronics Industry Co., Ltd. 629 Futaba Electronics Industry Co., Ltd. 5C036 EE14 EF02 EF06 EG15 EG28 EH04

Claims (5)

[Claims] 1. A wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor film is formed and a wire grid intersect with each other, wherein an anode electrode formed on a substrate, an insulating film covering the anode electrode, A wire grid fixed on the insulating film, the insulating film has an opening from which the dot-shaped phosphor film protrudes, and the wire grid has a conductive film formed on the entire peripheral surface of the glass fiber. Wire grid type fluorescent display tube. 2. In a wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor film is formed and a wire grid are arranged to intersect, the anode electrode formed on the substrate and the wire grid A wire grid type fluorescent display tube, comprising: a support member for a wire grid formed as described above; and a wire grid fixed on the support member, wherein the wire grid has a conductive film formed on the entire peripheral surface of the glass fiber. 3. A wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor film is formed and a wire grid are arranged to intersect, wherein the wire grid has a conductive film formed on one surface of a glass fiber, The wire grid type fluorescent display tube, wherein the wire grid is arranged and fixed so that the glass fiber is in contact with an anode electrode formed on a substrate. 4. A wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor layer is formed and a wire grid are arranged to intersect, wherein the wire grid has an insulating film formed on one surface of a metal wire, The wire grid type fluorescent display tube, wherein the wire grid is arranged and fixed so that the insulating film is in contact with an anode electrode formed on the substrate. 5. A wire grid type fluorescent display tube in which an anode electrode on which a dot-shaped phosphor layer is formed and a wire grid intersect with each other, wherein the wire grid has an oxide film formed on one surface of a metal wire; The wire grid type fluorescent display tube, wherein the wire grid is arranged and fixed so that the oxide film is in contact with an anode electrode formed on a substrate.