JP3104478B2 - Image display 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 an image display device for video equipment and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube is mainly used as a display element for displaying color television images. However, since a conventional cathode ray tube has a greater depth than a screen, it is impossible to produce a thin television receiver. It was possible. Recently, EL display devices, plasma display devices, liquid crystal display devices, and the like have been developed as display devices on a flat plate.
All of them are insufficient in performance such as luminance, contrast, and color reproducibility of color display.

In order to achieve a flat display device using an electron beam, a new display device has been proposed in Japanese Patent Application Laid-Open No. Hei 1-130453 (Japanese Patent Application No. 62-288762).

In this method, a screen on a screen is divided into a plurality of sections in a vertical direction, an electron beam is vertically deflected for each section to display a plurality of lines, and further divided into a plurality of sections in a horizontal direction. R (red), G (green), and B (blue) phosphors are sequentially emitted for each section (hereinafter, referred to as an image subsection), and the R, G, and B phosphors are sequentially emitted. The television image is displayed as a whole by controlling the irradiation amount of the electron beam by a color video signal.

FIG. 3 is an exploded perspective view showing a part of a conventional image display device. In FIG. 3, 1 is a back electrode, 2a,
Reference numerals 2 and 2 denote a line cathode as an electron beam source, 3 denotes an electron beam extraction electrode, 4 denotes a signal electrode, 5 denotes a focusing electrode, 6 denotes a horizontal deflection electrode, and 7 and 7 denote vertical deflection electrodes. Are stored in the glass container 8 and the back container 9, and the inside of the container is evacuated to constitute an image display device.

The back electrode 1 is made of a flat conductive material, and is provided in parallel with the linear cathodes 2a to 2c. The linear cathodes 2a to 2c are stretched in the horizontal direction so as to generate an electron current having a substantially uniform current density distribution in the horizontal direction. Then 2a, 2
(B, only three are shown). These line cathodes 2a to 2c are formed by coating an oxide cathode material on the surface of a tungsten wire, for example.

The extraction electrode 3 is made of a conductive plate 11 and faces the back electrode 1 via the line cathodes 2a to 2c. The extraction electrodes 3 are arranged in rows of through holes 10 provided at appropriate intervals in the horizontal direction so as to face each line cathode. Electrons emitted from the linear cathodes 2a to 2c are drawn through a through hole 10 in a certain direction to extract a certain amount of electrons, thereby controlling the amount of an electron beam.

A plurality of vertically elongated conductive plates 12 are arranged at predetermined intervals in the horizontal direction of the through-holes 10 in the extraction electrode 3 at positions opposed to each other in the horizontal direction.
In each of the conductive plates 12, the extraction electrodes 3
A similar through hole 13 is provided at a position facing the through hole 10. The signal electrode 4 controls the passage of the electron beam through the through hole 13 according to the video signal.

The focusing electrode 5 has a conductive plate 15 having a through hole 14 at a position facing the through hole 13 of the signal electrode 4.
And controls the size of the electron beam.

The horizontal deflection electrode 6 is formed in the through hole 1 of the focusing electrode 5.
The elongated conductive plates 16a and 16b are arranged on the same plane in the vertical direction so as to face the middle of the four rows so as to form a pair of horizontal deflection electrodes. I have. The electron beam is deflected in the horizontal direction by the conductive plates 16a and 16b.

The vertical deflection electrodes 7a and 7b have a structure in which two comb-shaped conductive plates are engaged with each other on the same plane at appropriate intervals. The projecting portion 18a of the conductive plate 7a and the upper conductive plate 7
A pair of vertical deflection electrodes is formed by the protruding portion 18b,
The electron beam 17 is deflected in the vertical direction.

The screen 19 is formed by applying a phosphor 20 that emits light by irradiation with an electron beam to an inner surface of a glass container 8, for example, and adding a metal back layer (not shown) thereon.

Here, the extraction electrode 3, the signal electrode 4, the focusing electrode 5, the horizontal deflection electrode 6, and the vertical deflection electrode 7 form an electrode unit 22. In the electrode unit 22, the electron beam 17 is emitted from the linear cathode 2, and the through holes 1 provided in the extraction electrode 3, the signal electrode 4, and the focusing electrode 5, respectively.
The light passes through the horizontal deflection electrodes 6 and the vertical deflection electrodes 7 and irradiates the screen 19.

In this image display device, in order to obtain a highly uniform image in which the seams of the adjacent image sub-sections 21 on the screen 19 are not visible, each electrode is processed and each electrode is assembled. Each electrode is processed and positioned with high accuracy.

The vertical deflection electrode 7 is composed of two conductive plates 7a and 7b, as shown in FIG. Conventionally, in the manufacturing process of the electrode unit 22, the vertical deflection electrode 7 has the conductive plates 7a and 7b individually joined. Therefore, the conductive plates 7a and 7b are not located on the same plane, and the respective protruding portions 18a and
There was a case where a level difference occurred in 8b. Projections 18a and 18
FIG. 5 is a cross-sectional view showing a case where a step is generated in FIG. 5B. The electron beam 23 changes its course due to the influence of the electric field when passing through the vertical deflection electrode 7. The position of the electron beam applied to the image varies depending on each image sub-division, which causes deterioration in image quality.

In order to solve this problem, when manufacturing the electrode unit 22, the vertical deflection electrode 7 joins one conductive plate 26 having a slit shown in FIG. The rear connecting portion 25 is cut to remove the conductive plates 7A and 7B.
A method for producing a pair of vertical deflection electrodes has been proposed.

As shown in an enlarged view of FIG. 6B, the connecting portion 25 is provided with a concave portion 27 (hereinafter referred to as "sludge") at a connecting portion with the conductive plate 26. These are for preventing galling at the time of cutting the connection portion 25 by, for example, press cutting.

[0018]

By the way, in the manufacturing process of such a vertical deflection electrode, the position recognition of the connection portion 25 when the connection portion 25 is cut is set by a cutting means (for example, a press device). When the electrode unit 22 is not placed at a predetermined position of the cutting means, the shape after cutting is shown, for example, in FIG. 7A. It shifts. As a result, the electric field is distorted, affecting the trajectory of the current beam in the vicinity. As a result, horizontal lines are generated at the joints of the image subsections, and the image quality is degraded.

Further, in such a manufacturing method, the vertical deflection electrode 7 when the connecting portion 25 is cut at a predetermined position.
As shown in FIG. 7B, the projections 18a and 18b have recesses 27 at positions facing each other via the space 28.
At this vertical deflection electrode, the electron beam is positioned at positions 29 and 3
When the electron beam passes through 0 and 31, the electron beam passing through the position 30 near the concave portion 27 is different from the electric field near the position 29 and the position 31 because the capacitance of the projecting portions 18a and 18b is smaller by the concave portion 27. A slight change occurs in the traveling direction of the electron beam passing through the position 29 and the position 31, which also causes deterioration of the image quality on the screen.

The present invention relates to a method for manufacturing an image display device and a vertical deflection electrode for solving the above problems.

[0021]

According to the present invention, there is provided a method of manufacturing an image display device, wherein the vertical deflecting electrode has a greater width at a center portion than at an end portion of the adjacent protruding portion after bonding with another electrode. A method of manufacturing an image display device manufactured by cutting a conductive plate integrally formed with a connection portion having a hole in the center portion by cutting the connection portion with a width smaller than the space;
The vertical deflection electrode is related to an image display device, wherein an uneven portion having concave portions at both ends of a protruding piece is provided on a comb-shaped conductive plate at positions opposed to each other via the space.

[0022]

According to the method of manufacturing an image display device of the present invention, the connecting portion can be cut accurately, and the occurrence of galling due to the cutting can be prevented.

Also, by having the shape of the vertical deflection electrode as in the second invention, it is possible to prevent the occurrence of electric field disturbance.

In addition, since all the electron beams can be uniformly applied to each image subsection, a high-quality image can be provided.

[0025]

【Example】

(Embodiment 1) An embodiment of the first invention will be described with reference to FIG. As shown in FIG. 3, the image display device includes a back electrode 1, a line cathode 2a, 2b, 2c, an extraction electrode 3, a signal electrode 4, a focusing electrode 5, a horizontal deflection electrode 6, and a vertical deflection electrode 7, It is housed in a case made of a glass container 8 coated with a phosphor and a back container 9, and the inside of the case is configured in a vacuum state. Since each electrode is the same as that described in the section of the prior art, the description is omitted here.

In the case made of the glass container 8 and the back container 9, the extraction electrode 3, the signal electrode 4, the focusing electrode 5, the horizontal deflection electrode 6 and the vertical deflection electrode 7
2 are housed together with the back electrode 1 and the linear cathode 2.

The electrode unit 22 is integrated with electrodes bonded thereto. As the bonding means, for example, low melting point solder glass (hereinafter, referred to as a rod bar) is used. The rod has a cylindrical shape with a diameter of 0.4 micrometers and a length of several centimeters, and an adhesive is applied around the circumference. The rod is disposed at a position where the passage of the electron beam through the electrode is not hindered. The electrode is further stacked via the rod, and heat is applied to melt the adhesive to join the rod. The rod bar in which the adhesive is melted serves as a spacer to maintain a space between the electrodes and to maintain an insulating state between the electrodes.

A pair of vertical deflection electrodes 7a and 7b, which are formed in the same plane with comb-shaped projections 18a and 18b meshing with each other via a space, are also joined to the horizontal deflection electrode 6. In the joining manufacturing process, after one conductive plate 101 having a slit shown in FIG. 1A is joined to the horizontal deflection electrode 6, the connecting portion 102 between the slits is cut by, for example, a pressing method. I do.

Next, FIG. 1B shows an enlarged view of the connecting portion 102. The connection portion 102 has a width a at a center portion larger than a width b at an end portion, and has a hole 103 at the center portion. The hole 103 serves to recognize the position, for example, for positioning at the time of electrode bonding, or for the connection portion 1.
02 can be effectively used for position recognition when cutting 02. Since the holes 103 are formed at the same time as the etching process for forming the slits, an extra manufacturing step is not added, and the position can be manufactured with high positional accuracy. Although the hole 103 is provided in the center, the strength a does not decrease because the width a at the center of the connecting portion 102 is wider than the width b at the end.

Further, the connecting portion 102 is provided with the protruding portion 1 of the conductive plate.
A concave portion (hereinafter referred to as "slack") is provided at a portion connected to 8a. The recess 104 is also formed by etching at the same time as the hole 103 described above.

The connecting portion 102 of the conductive plate 101 is cut to form the vertical deflection electrode 7 including the protruding portions 18a and 18b.

Next, the step of cutting the connecting portion 102 will be described. As shown by the dotted line in FIG.
The sheet is cut at a width c smaller than the width d at 05. In the case where cutting is performed by press working, bite of the press can be prevented because the stagnation 104 is formed. In addition, if the pressing position is recognized using the hole 103, the connection portion 102 can be cut with high precision around the hole 103. Further, since the width c of the pressed portion is smaller than the width d of the space 105, the biting of the press to the protruding portions 18a and 18b is reduced, so that the stagnation 104 can be reduced.

As described above, in the manufacturing method of this embodiment, particularly in the manufacturing method of the vertical deflection electrode 7, the connecting portion 102 is
03, the electrodes can be aligned, and thus the connection portion 102 can be cut with high accuracy. Further, since the width to be cut is smaller than the width between the conductive plates (between the protruding portions 18a and 18b), the force of biting the protruding portions 18a and 18b is reduced and the size of the squat 104 is reduced. Therefore, it is possible to reduce the influence on the trajectory of the electron beam due to the slack 104 of the protruding portions 18a and 18b after cutting.

(Embodiment 2) An embodiment of the second invention will be described with reference to FIG. Since the image display device of the present invention has been described with reference to FIG. 3 except for the vertical deflection electrode 7, the description is omitted here.

FIG. 2 is a partially enlarged view of the vertical deflection electrode.
The projections 18a and 18b and the space 105 therebetween are shown. Numerals 107 and 108 indicate the passing positions of the electron beams.

The vertical deflection electrode of the image display device has a protrusion 1
A protruding piece 106 is provided at a position opposite to that of FIGS. In addition, on both sides of the protruding piece 106, there is provided a slack 104. This slimy 10
4 is necessary in the manufacturing process of the vertical deflection electrode.

Positions 107 and 108 near the slush 104
In comparison with an electron beam passing through another position, an electric field is disturbed due to the influence of the presence of the stagnation 104, that is, a difference in capacitance between the protruding portions 18a and 18b. Although this had an adverse effect, the provision of the protruding portion 106 as in the present invention can stabilize the electron beam by canceling out the slackened portion.

[0038]

As described above, according to the method for manufacturing an image display device of the first invention, the conductive plates opposed to the vertical deflection electrodes can be accurately arranged on the same plane, so that the image quality can be improved. A good image display device can be provided.

Further, according to the second aspect of the present invention, it is possible to provide a vertical deflection electrode which does not affect the trajectory of the electron beam. Therefore, it is possible to provide an image display device having no horizontal lines due to the overlap of the electron beams.

[Brief description of the drawings]

FIG. 1A is a partial front view of a vertical deflection electrode according to an embodiment of the present invention. FIG. 1B is an enlarged partial view of a vertical deflection electrode according to an embodiment of the present invention. Partial enlarged view of a vertical deflection electrode

FIG. 2 is a partially enlarged view of a vertical deflection electrode according to an embodiment of the second invention.

FIG. 3 is an exploded perspective view of an electrode portion of a conventional image display device.

FIG. 4 is an enlarged view of a vertical deflection electrode of a conventional image display device.

FIG. 5 is a side view of a vertical deflection electrode of a conventional image display device.

6A is a perspective view showing a vertical deflection electrode of a conventional image display device. FIG. 6B is a partially enlarged view of a vertical deflection electrode of the conventional image display device.

7A is a partially enlarged view of a vertical deflection electrode of a conventional image display device. FIG. 7B is a partially enlarged view of a vertical deflection electrode of a conventional image display device.

[Explanation of symbols]

 7 a vertical deflection electrode 18 a, 18 b vertical deflection electrode protrusion 101 conductive plate 102 connection 103 hole 104 slush 105 space (slit) 106 protruding piece

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Toshifumi Nakatani 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-36937 (JP, A) JP-A-5- 101771 (JP, A) JP-A-1-130453 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/02

Claims (1)

(57) [Claims] 1. A flat glass bulb vacuum, a linear cathode as an electron beam source, a screen having a phosphor that emits light when irradiated with an electron beam, a back electrode for controlling the amount of emission of the electron beam, an electron beam Electrode, a signal electrode for controlling the passage of the electron beam, a focusing electrode for focusing the electron beam, a horizontal deflection electrode for deflecting the electron beam in the horizontal direction, and a conductive plate having a comb-shaped protrusion. In the method for manufacturing an image display device accommodating the vertical deflection electrodes meshed with each other via a space above, the vertical deflection electrodes are arranged such that, after joining with another electrode, the adjacent protruding portion has a more central portion than an end portion. A conductive plate having a large width and integrally formed with a connecting portion having a hole in the center portion is manufactured by cutting the joining portion with a width smaller than the space. Manufacturing method of an image display device.