JP3427869B2 - Electrode structure of light emitting device and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting element electrode structure for forming a large screen display device used in a stadium and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A schematic structure of an example of a conventional light emitting device of this type is shown in FIGS. FIG. 6 is a front view showing a conventional light emitting element, FIG. 7 is a sectional view taken along the line AA in FIG. 6, and FIG. 8 is an exploded perspective view showing a main part inside the light emitting element. In the figure, 2
Reference numeral 1 is a light emitting element, and phosphors 22 of three types of RGB are regularly applied to the light emitting element 21, and color display is possible. A large-screen display is configured by arranging a large number of light emitting elements 21 of this type. Here, in the large-screen display, a gap g corresponding to the width of the seam is provided between the pixels of the light emitting element 21 so that the seam of the light emitting element 21 is inconspicuous.

Reference numeral 21a is a display portion (front panel) having an inner surface coated with the phosphor 22, 21b is a spacer, and 21c is a substrate (rear panel) on which various control electrodes to be described later are arranged. Then, these 21a to 21c constitute a vacuum container for a display tube, a high voltage (about 10 kV) is applied to each phosphor 22, and a signal is applied to various control electrodes via a lead wire 23. . Reference numeral 24 is a linear cathode that is extended in parallel in the row or column direction, 25 is a first control electrode (hereinafter referred to as a scan electrode), 26 is a second control electrode (hereinafter referred to as a data electrode), 27 Is an opening provided in the data electrode 26 through which electrons pass, and 28 is a support electrode for connecting the cathode 24 to the wire.

Next, the operation will be described. The basic principle of the light emitting device 21 of this type is that the thermoelectrons emitted from the cathode 24 are accelerated and collide with the anode to excite the phosphor 22 coated on the anode surface to emit light. The thermoelectrons emitted from the cathode 24 are transferred to the scanning electrode 2
5 and the potential of the data electrode 26 are combined to control as follows.

(1) When both the scanning electrode 25 and the data electrode 26 are positive with respect to the cathode 24, the vicinity of the cathode 24 has a positive potential and electrons are emitted from the cathode 24.
The emitted electrons pass through the opening 27, reach the anode, and cause the phosphor 22 to emit light. (2) When the scanning electrode 25 is positive and the data electrode 26 is negative,
Due to the negative potential of the data electrode 26, the electrons emitted from the vicinity of the cathode 24 cannot reach the anode, and the phosphor 22 does not emit light. (3) When the scanning electrode 25 is negative and the data electrode 26 is positive, the negative potential of the scanning electrode 25 causes the potential in the vicinity of the cathode 24 to become negative, and the emission of thermoelectrons is suppressed. The cathode 24 is
The electron emission from the cathode 24 is strongly influenced by the electric field of the scanning electrode 25 because it is wired near the scanning electrode 25. (4) When both the scan electrode 25 and the data electrode 26 are negative, the potential in the vicinity of the cathode 24 becomes negative and the emission of thermoelectrons is suppressed.

As described above, the cathode 2 located at the intersection of the scan electrode 25 and the data electrode 26 to which the positive potential is applied.
Only the electrons emitted from No. 4 can pass through the opening 27, and the phosphor 22 emits light. In this way, by sequentially applying the scanning signal to the scanning electrode 25 and applying the arbitrary data signal to the data electrode 26 in synchronization with this, an arbitrary display can be obtained.

As the cathode 24, a direct heating type linear cathode is used. It is heated by the flow of a predetermined current and emits thermoelectrons, and is characterized by low power consumption. In addition, the cathode 2 is so arranged that the electrons emitted from the cathode 24 are uniformly irradiated on each phosphor screen.
Corresponding to each of the fluorescent screens, four wires 4 are provided on the support electrodes 28 standing on the rear panel 21c.

In the above structure, since the frame (supporting electrode 28) is fixed on the rear panel 21c by the frit glass and the cathode 24 is hung on the frame, when the yield of the catenary 24 is low, There is a problem that the back panel 21c is wasted due to a defective work of the cathode wire.

As a technique for solving such a problem, there is, for example, Japanese Patent Laid-Open No. 6-67712, and the technique is shown in FIGS. 9 (a), 9 (b) and 9 (c). FIG. 9A shows a state of the frame 29 in which the cathode 24 is extended, and the cathode 24 is extended over the supporting electrodes 30a to 30e forming the frame 29, and the cathode 24 is covered with metal from above. It is welded so as to be held down by the tip 31. FIG. 9B shows an example in which the pressed band-shaped electrode 32 is used instead of the metal tip 31. In the figure, C indicates a cutting part. As a device for connecting the cathode 24 to the wire, for example, there is a device as disclosed in Japanese Patent Application Laid-Open No. 3-145031, and the metal chip 31 or the strip electrode 3 is used.
2 is cut into a predetermined length with a cutter, and is superposed on the cathode 24 and welded.

In the above-mentioned device, the structure shown in FIGS.
Compared with the conventional example described in 1 above, a large number of cathodes 24 are connected. As shown in FIG. 9 (a), the state in which the cathode 24 is connected to the wire is fixed on the rear panel 21c as shown in FIG.
Shown in (c). The ladder-shaped support electrodes 30a to 30e, on which the cathode 24 is extended, are fixed on the rear panel 21c with frit glass or the like, and both ends thereof are cut.
Is formed.

[0011]

However, even in the case of FIG. 9, there are the following problems. That is, the height from the scan electrode to the cathode is the bent portion 30 of the support electrode.
It depends on the height of f, but this bending is 1
A height of about mm is required, and if the height is less than 1 mm, it becomes difficult to form by bending. On the other hand, in order to display a high-resolution image, it is necessary to shorten the pixel arrangement pitch,
In this case, the length of the cathode also becomes short. Here, in order to improve the control of electrons, it is necessary to shorten the dimension between the cathode and the scanning electrode, but it is difficult with the above-mentioned conventional techniques. Therefore, it is necessary to reduce the distance between the cathode and the scanning electrode. I couldn't.

The present invention has been made in order to solve the above-mentioned problems. It eliminates the need for processing such as bending, shortens the process, and reduces the dimension between the cathode and the scanning electrode, thereby reducing the number of electrons. It is an object of the present invention to provide a light emitting device electrode structure that can be easily controlled and a manufacturing method thereof.

[0013]

An electrode structure of a light emitting device according to claim 1 of the present invention comprises a plurality of electrodes arranged in parallel on a rear panel or a frame arranged and fixed on a mounting plate arranged in front of the rear panel. A flat plate-shaped electrode support portion, which is laid over and spanned by a cathode line, is stacked and fixed.

According to a second aspect of the present invention, there is provided a method for manufacturing an electrode structure of a light emitting device, which comprises a first step of connecting a cathode on a ladder-shaped first frame having both ends integrated with a connecting bar, and a rear panel. Alternatively, the second step of fixing the second frame on the mounting plate and the first frame on the second frame are overlapped and welded to the rear panel or the mounting plate, and the connecting bar of the ladder-shaped first frame is attached. This is the third step of cutting.

According to a third aspect of the present invention, there is provided an electrode structure for a light emitting device, wherein an electrode supporting portion is provided with a projection and an opening is provided, and the projection provided on the second frame is passed through the opening to provide the projection. Welded together.

In the electrode structure of the light emitting device according to claim 4 of the present invention, the projection provided on the second frame is passed through the opening provided in the electrode supporting portion, and the projection is bent on the electrode supporting portion. It is a thing.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 (a) is a thin plate on which the cathode 1 is pre-installed,
1 shows a flat plate-shaped first frame 2. That is, the cathode 1 is stretched on the frame 2, the metal tip 3 is superposed on the predetermined position, and the metal tip 3 is welded from above. Both ends of the frame 2 are formed with thin grooves 98 so that they can be easily cut by bending the position of the arrow D.
In the first frame 2, the portion cut as described above is called a connection bar 99, and the remaining cut portion (the portion where the cathode 1 is extended) is the electrode supporting portion 100.
Call.

Next, FIG. 1 (b) is a diagram showing a positional relationship between a thin plate-shaped second frame 5 fixed on a rear panel 4 (also referred to as a mounting plate) and the first frame 2. The second frame 5 is firmly fixed to the rear panel 4 with frit glass, and the first frame 2 is laid on the second frame 5 and welded in a direction perpendicular to the rear panel 4. The welding method is spot welding, laser welding, or the like.

FIG. 1 (c) is a view showing a state in which the connection bar 99 of the frame 2 is cut after the first frame 2 is overlaid and welded as described above. 6 indicates a welded portion. At this time, by accurately aligning the first frame 2 and the second frame 5, the cathode 1 can be installed over the control electrode 25 with high precision. Here, if a defect occurs during the catenary's overhead line, the first frame 2 may be disposed of, and therefore the rear panel 4 is not wasted, and the loss at the time of defect generation is reduced.

The first frame 2 and the second frame 5 are both etched, and a plate thickness of 0.25 mm or less can be used for each, and the distance between the scanning electrode 25 and the cathode 1 is 0.5 mm, or Can be set to: Moreover, the thickness of each of the frames 2 and 5 is uniform, and the distance between the cathode 1 and the scanning electrode 25 is determined by the thickness of the two overlapped with each other, so that a highly accurate electrode can be obtained and a uniform display with little variation can be obtained. To be

Embodiment 2. FIG. 2 shows an enlarged view of a main part of the second embodiment and corresponds to a cross-sectional view taken along the line BB of FIG. 1 (c). When welding the first frame 2 and the second frame 5 in the first embodiment,
A high temperature is generated in the welded portion 6 in a short time, and a thermal shock is generated on the rear panel 4 to which the second frame 5 is fixed. As a result, minute cracks (not shown) may occur on the rear panel 4. In order to solve this problem, in the welded portion 6 of the first frame 2 and the second frame 5, a recess 7 is provided on the rear panel 4 surface immediately below the welded portion 6. Since the back panel 4 is manufactured by molding with a mold, the recess 7 of the back panel 4 is provided when the mold is processed and the back panel 4 is molded. As a result, a gap is generated between the second frame 5 and the rear panel 4, the thermal shock to the rear panel 4 is mitigated, and the crack can be eliminated.

Embodiment 3. FIG. 3 (a) shows the third embodiment and is taken along line BB of FIG. 1 (c).
It is a principal part expanded sectional view corresponded to a line sectional view, and FIG.3 (b) is a principal part enlarged perspective view. In order to solve the same problem as in the second embodiment, the first projection 8 is set up on the second frame 5, the projection 8 is passed through the opening 9 of the first frame 2, and the end of the opening 9 is formed. A second protrusion 10 adjacent to the protrusion 8 is also set up on the first frame 2 of the portion, and the first protrusion 8 and the second protrusion 10 are welded in a state of being overlapped with each other. Since such protrusions can be welded to each other at a position away from the back panel 4, thermal shock does not occur on the back panel 4 and cracks (not shown) can be eliminated. Here, each of the protrusions 8 and 10 is formed by vertically arranging a notch that has been etched, has a good dimensional accuracy, and is convenient for alignment.

Fourth Embodiment 4 and 5 show the fourth embodiment, and B of FIG. 1 (c) is shown.
It is a principal part expanded sectional view corresponded to a -B line sectional view. In all of the first to third embodiments, the first frame 2 is fixed by welding, but first, as shown in FIG.
After the protrusion 11 is erected on the first frame 2 and the first frame 2 is fixed by bending the protrusion 11 as shown in FIG. 4,
The thermal shock itself does not occur and cracks can be eliminated. At this time, the protrusion 11 of the second frame 5 penetrates the opening 9 of the first frame 2 and is bent around the opening 9. Here, the welding of Embodiments 1 to 3 has two purposes of securing the cathode 1 and ensuring electrical conduction, but in Embodiment 4, the former is achieved by bending and the latter is Can also be achieved by controlling the pressure during bending to an appropriate value. In particular, as shown in FIG. 5, if the width L ₁ of the opening 9 is made slightly smaller than the width L _{2 of the} protrusion 11 and the first frame 2 is pushed in, a sufficient electric conduction state can be obtained.
Further, since the inside of the light emitting element is in a vacuum, the contact resistance does not change with time due to oxidation or the like.

Embodiment 5. In each of the above-mentioned embodiments, the second frame 5 is required on the rear panel 4, but the second frame 5 is required.
Does not have to be a quadrangle as shown, but only plays an auxiliary role for fixing the first frame 2.
For example, similar to the first frame 2, both sides of the connection bar 9
If the method of cutting the connection bar 99 after fixing to the rear panel 4 is individually integrated with the rear panel 4,
The process is shortened as compared with fixing to. When two or more second frames 5 are stacked, the cathode 1 and the scanning electrode 25
The interdimension can easily be increased. That is, the present invention can be applied to a light emitting element having any specifications.

In the above embodiment, the example in which the second frame 5 is provided on the rear panel 4 in advance and the first frame 2 is further welded on the second frame 5 has been described. The first frame 2 may be welded onto a mounting plate provided with the scanning electrodes and provided with the second frame 5, and then this mounting plate may be arranged on the rear panel 4.

[0026]

As described above, according to claim 1 of the present invention, in the case of a defect at the time of cathodic catenary, the electrode support portion is wasted, but the rear panel or the mounting arranged in front of this rear panel. The plate is not wasted, and the loss when a defect occurs is reduced. Further, the distance between the cathode and the scanning electrode is determined by the thickness of the electrode supporting portion and the second frame, and the thickness of both can be reduced, so that the dimension between the cathode and the scanning electrode is shortened, and the control of electrons is easy. become.

Further, according to claim 2 of the present invention, the method further comprises the steps of forming a ladder-shaped first frame in which the cathode is pre-installed and fixing the second frame on a flat plate. Since the first frame is superposed on the second frame and welded in a direction perpendicular to the back panel, the cathode is formed by the third step of cutting the connecting bar of the ladder-shaped first frame. The size of the rear panel can be reduced, and the back panel is not wasted due to a defect at the time of the cathode wire, and the loss at the time of the defect is reduced.

Further, according to claim 3 of the present invention, the electrode supporting portion is provided with a projection and an opening adjacent to the projection, and the projection is provided at a position corresponding to the opening on the second frame. Since the both projections are welded to each other after passing through the opening, the thermal shock to the rear panel does not occur and the crack can be eliminated.

According to a fourth aspect of the present invention, an opening is provided in the electrode supporting portion, a projection is provided at a position corresponding to the opening on the second frame, and the projection is passed through the opening. Since it is bent, the thermal shock itself does not occur and cracks can be eliminated.

[Brief description of drawings]

1A, 1B, and 1C are perspective views showing a manufacturing process of an electrode structure of a light emitting device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing an electrode structure according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view (a) and a partial perspective view (b) showing an electrode structure according to a third embodiment of the present invention.

FIG. 4 is a partial sectional view showing an electrode structure according to a fourth embodiment of the present invention.

FIG. 5 is a partial perspective view showing an electrode structure according to a fourth embodiment of the present invention.

FIG. 6 is a front view showing a conventional light emitting element.

7 is a cross-sectional view taken along the line AA in FIG.

FIG. 8 is an exploded perspective view showing a main part in a conventional light emitting element.

9A, 9B and 9C are perspective views showing an electrode structure of a conventional light emitting device.

[Explanation of symbols]

1 cathode, 2 first frame, 4 rear panel,
5 second frame, 6 welds, 7 rear panel indentations, 8, 10, 11 protrusions, 9 openings, 25 scanning electrodes, 98 narrow grooves, 99 connecting bars, 100 electrode support.

Front page continuation (72) Inventor Kozaburoyama 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. (72) Inventor Kenji Mine 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Kazunori Tatsuta 700 Wada, Ueno-machi, Ise-shi, Mie 700 Ida Electronics Industry Co., Ltd. 56) References JP-A-6-36712 (JP, A) JP-A-7-94915 (JP, A) JP-A-6-94077 (JP, A) Actually opened 61-133960 (JP, U) Actually opened Sho 63-58451 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 31/15 H01J 9/18

Claims (4)

(57) [Claims] 1. A plurality of phosphors formed on an inner surface of the front panel, the front panel and a rear panel facing the front panel, and the plurality of phosphors arranged corresponding to the plurality of phosphors. In an electrode structure of a light emitting device including a plurality of cathodes that are wired in front of a back panel, a second frame fixedly arranged on the back panel or a mounting plate arranged in front of the back panel. An electrode structure of a light-emitting element, characterized in that a flat plate-shaped electrode supporting portion in which a plurality of linear cathodes are laid over in advance is stacked and fixed thereon. 2. A manufacturing method for manufacturing an electrode structure according to claim 1, comprising a first step of connecting the cathode on a ladder-shaped first frame having both ends integrated with a connection bar, The second step of fixing the second frame on the back panel or the mounting plate, the first frame on the second frame, the electrode support portion is welded, and the first ladder-shaped frame is formed. A method of manufacturing an electrode structure of a light emitting device, comprising a third step of cutting the connection bar of the frame. 3. A projection and an opening adjacent to the projection are provided on the electrode supporting portion, and a projection provided at a position corresponding to the opening on the second frame is provided on the opening of the electrode supporting portion. The electrode structure of the light emitting element according to claim 1, wherein the projections are welded to each other after being passed through. 4. An electrode support part is provided with an opening, a projection is provided on a second frame at a position corresponding to the opening of the electrode support part, and the projection of the second frame is provided on the electrode support part. The electrode structure of the light emitting device according to claim 1, wherein the electrode structure is bent through the opening.