JP2764951B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device in a video device.

2. Description of the Related Art Conventionally, a cathode ray tube is mainly used as a display device for displaying color television images, but a conventional cathode ray tube has a very long depth compared to a screen, and a thin television receiver is manufactured. It was impossible to do. Recently, EL display devices, plasma display devices, liquid crystal display devices, and the like have been developed as flat display devices, but all of them are insufficient in terms of performance such as luminance, contrast, and color reproducibility of color display. It has not been put to practical use.

Accordingly, a novel display device is proposed in Japanese Patent Application No. 62-288762 as a device for achieving a flat display device using an electron beam.

This divides the screen on the screen into a plurality of sections in the vertical direction, deflects the electron beam vertically for each section, displays a plurality of lines, and further divides the screen horizontally into a plurality of sections. The phosphors of R, G, B, etc. are sequentially emitted for each section, and the irradiation amount of the electron beam to the phosphors of R, G, B, etc. is controlled by a color video signal, as a whole. This is for displaying a television image.

FIG. 5 shows the internal configuration of a conventional image display device. Fifth
In the figure, 1 is a back electrode, 2a to 2c are a line cathode as an electron beam source, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 is a focusing electrode, 6 is a horizontal deflection electrode, and 7a and 7b are This is a vertical deflection electrode in which these components are housed in glass containers 8 and 9 and the inside of the containers is evacuated.

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. In the figure, only three of 2a, 2b, and 2c are shown).
These line cathodes are formed, for example, by coating a surface of a tungsten wire with an oxide cathode material.

The back electrode 1 is made of a flat conductive material,
It is provided in parallel to 2 c.

The extraction electrode 3 is opposed to the back electrode 1 via the linear cathodes 2a to 2c and has through holes 10 provided at appropriate intervals in the horizontal direction.
Of the conductive plate 11 on a horizontal line facing each line cathode.
Consists of

The signal electrode 4 comprises a row of a plurality of vertically elongated conductive plates 12 arranged at predetermined positions at positions horizontally opposed to each of the through holes 10 in the extraction electrode 3,
Each conductive plate has a similar through-hole 13 at a position facing the through-hole 10 of the extraction electrode 3.

The focusing electrode 5 includes a conductive plate 15 having a through hole 13 at a position facing the through hole 13 of the signal electrode 4.

The horizontal deflection electrode 6 is a vertically elongated conductive plate on the same plane facing the middle of the row of the through-holes 14 of the focusing electrode 5.
16a and 16b are arranged so as to form a pair of horizontal deflection electrodes, and have a shelf shape as a whole.

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 with an appropriate interval therebetween. The plate 18a and the upper conductive plate 18b form a pair of vertical deflection electrodes.

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

In order to obtain a highly uniform image in which the seam of the image subsection 21 is invisible, it is necessary to process and position each electrode with high precision when processing and assembling the electrodes. However, the electrode groups 3 to 6 and 7a, 7b are all thin conductive plates, and the through holes 13, 14, slits and the like need to be processed to the order of micron order by etching. is there.

In particular, a large number of conductive plates separated like horizontal deflection electrodes 6
In the case of 16B and 16B, initially, as shown in Fig. 6, the bars 22 are provided on the conductive plates 16A and 16B as appropriate, and they are processed and manufactured by etching as a single piece that is all partially connected. And
After laminating and fixing with another electrode 23 and an adhesive glass 25 via an insulating spacer 24, unnecessary bars 26 are removed by a method such as a laser beam cutting process, so that the conductive plate is finally removed.
16a and 16b are electrically divided.

Problems to be Solved by the Invention However, in the case of such a structure, it is necessary to cut the bars provided on the conductive plates arranged in a fence shape over the entire screen, so that there are many cut portions and the processing time is long. Not suitable for mass production. Also, since the inside of the screen is cut, the conductive plate is deformed at the time of cutting and the trajectory of the electron beam is bent, resulting in image defects.For example, when the bar is blown by a laser beam, the scattered metal adheres to the insulating spacer 24. The dielectric breakdown voltage between each electrode is reduced, and the reliability is significantly reduced.The scattered metal adheres to the through holes 10, 13, and 14 through which the electron beam passes, and may block the electron beam. Had become.

Therefore, an electrode structure as shown in FIG. 7 has been developed. That is, the horizontal deflection electrode 32 is composed of two reinforcing bars 40 and 41 meshed with each other in a horizontal direction with respect to the screen on a same plane via an appropriate space, and furthermore, the two comb-shaped reinforcing bars are provided. Comb-like conductive plates 42 and 43 are formed so as to protrude from the screens 40 and 41 in the vertical direction of the screen, and the comb-like conductive plates 42 and 43 are configured to mesh with each other via an appropriate space. The other electrode structures are the same as in FIG.

However, in such a configuration, the comb-shaped conductive plates 42 and 43 projecting vertically act as a pair of horizontal deflecting electrodes, but the horizontal deflecting electrodes are operated by the comb-shaped reinforcing bars 40 and 41. There is a concern that the effect of the vertical deflection may be exerted on the surface.

The present invention has been made in view of the above circumstances, and provides a flat display device that realizes high-quality images at low cost.

Means for Solving the Problems In order to solve the above problems, the present invention provides a rear electrode, a line cathode as an electron beam source, an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a screen directed from the back of the screen to the front. In a flat display device in which plates are arranged and these are housed in the vacuum of a flat glass bulb, two horizontal deflection electrodes are meshed with each other in a horizontal direction with respect to the screen on a same plane via an appropriate space. Comb-shaped conductive plates, which are formed of reinforcing bars, and further project vertically from the two comb-shaped reinforcing bars in the vertical direction on the plane, mesh with each other via an appropriate space, and the comb-shaped reinforcing bars are comb-shaped. It is characterized in that the end surface of the conductive plate has a saw-tooth shape.

Function The present invention provides a horizontal deflection electrode having the above-described structure, when processing and assembling an electrode, after laminating and fixing a horizontal deflection electrode previously processed by etching as another single piece with another electrode via an insulating spacer. In electrically dividing the conductive plate, it is only necessary to cut the reinforcing bars that mesh with each other in the horizontal direction at the end of the screen, which significantly shortens the processing and assembly time, and furthermore, even if there is deformation during cutting, etc. , So that a high-quality image can be obtained.

Furthermore, by forming the end face of the comb-shaped reinforcing bar of the horizontal deflection electrode in a saw-tooth shape, the interval between the two comb-shaped reinforcing bars can be increased, thereby reducing the vertical deflection effect of the horizontal deflection electrode. Further, as a result, it is possible to prevent the driving voltage waveform of the vertical deflection electrode from being complicated in order to correct the vertical deflection effect of the horizontal deflection electrode.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the internal configuration of an image display device according to an embodiment of the present invention.

27 is a back electrode, 28a to 28c are line cathodes as an electron beam source, 29 is an electron beam extraction electrode, 30 is a signal electrode, 31
Is a focusing electrode, 32 is a horizontal deflection electrode, and 33 is a vertical deflection electrode. These components are housed in a glass container 34, and the inside of the container is evacuated.

The linear cathodes 28a to 28c are stretched in the horizontal direction so as to generate an electron flow having a substantially uniform current density distribution in the horizontal direction, and a plurality of the linear cathodes are vertically spaced at appropriate intervals (this embodiment). Then
(Only three of 28a, 28b, 28c are shown.) These line cathodes are formed, for example, by coating a surface of a tungsten wire with an oxide cathode material.

The back electrode 27 is made of a flat conductive material and has a linear cathode 28
It is provided parallel to 28 c.

The extraction electrode 29 is connected to the back electrode through the line cathodes 28a to 28c.
Through holes 35 opposed to 27 and provided at appropriate intervals in the horizontal direction
Of the conductive plate 36 on the horizontal line facing each line cathode
Consists of The through-hole 35 is circular in this embodiment, but may be elliptical or rectangular or slit-like.

The signal electrode 30 is composed of a row of vertically elongated conductive plates 38 that are arranged at predetermined positions at positions facing each other in the horizontal direction with respect to each of the through holes 35 in the extraction electrode 29,
Each conductive plate has a similar through-hole 37 at a position facing the through-hole 35 of the extraction electrode 29. Through hole 37
May be elliptical, rectangular, or vertically elongated slit-shaped.

The focusing electrode 31 has a through hole 39 at a position facing the through hole 37 of the signal electrode 30.

The shape of the through hole 39 may be a circle, an ellipse, or a slit, and the number of focusing electrodes may be plural.

The horizontal deflection electrode 32 is composed of two reinforcing bars 40 and 41 engaged with each other in a horizontal direction with respect to the screen via an appropriate space, and furthermore, the two reinforcing bars 40 and 41 engaged with each other form a screen on the same plane. Comb-shaped conductive plates 42, 43 projecting to both sides in the vertical direction
Are engaged with each other via a suitable space, and the protruding comb-shaped conductive plates 42 and 43 are formed in the through holes of the focusing electrode 31.
A pair of horizontal deflection electrodes are arranged so as to face each other in the middle of the 39 rows. Therefore, by applying a horizontal deflection voltage to each of the two reinforcing bars 40 and 41, the electron beam 44 emitted from the through hole 39 of the focusing electrode 31 is horizontally deflected between the comb-shaped conductive plates 42 and 43. You. Here, the horizontal deflection electrode 32 is connected to the two reinforcing bars 40, 41 by the comb-shaped conductive plates 42,
The end faces at which 43 has risen are sawtooth-shaped 40A, 41A.

The vertical deflection electrodes 33a and 33b have a configuration in which a conductive plate having a connecting portion 45 at an end, that is, a configuration in which two comb-shaped conductive plates are meshed with each other at appropriate intervals on the same plane,
For example, for the electron beam 44, a pair of vertical deflection electrodes is formed by the lower conductive plate 46a and the upper conductive plate 46b.

The screen 47 is formed by applying a phosphor 48, which emits light when irradiated with an electron beam, to the inner surface of the glass container 34, and further adding a metal back layer (not shown) thereon.

 Next, an electrode processing method will be described.

In this embodiment, in order to obtain an image with no seams and high uniformity of the image subsection 49, it is necessary to process and position each electrode with high precision as described in the section of the problem to be solved. There is. However, since the electrode groups 29 to 33 are all thin conductive plates, the shapes and positional accuracy of the through holes 35, 37, 39, slits, and the like are controlled to the micron order by etching. These electrode groups
FIG. 2 shows a method for eliminating the mutual positional deviation of the through holes 35, 37, 39, slits, etc. of 29 to 33, and fixing them by bonding at predetermined intervals and electrical insulation. In FIG. 2, reference numeral 50 denotes each electrode, and a spacer 52 having at least a surface formed of an insulating material and having a surface coated with an adhesive glass 51 is inserted between the electrodes. The blocks having the electrodes 50 and the spacers in the form of layers are positioned by pins 54 set on a firing substrate 53 made of a flat plate, and are pressed by a stamper 55. In this state, the glass is heated to the melting temperature of the bonding glass 51, and the bonding glass is crushed to bond the electrodes 50 and the spacers 52.

As shown in FIG. 1, the horizontal deflection electrodes are comb-shaped conductive plates 42 and 43.
If they are not arranged so as to accurately face the middle of the row of the through-holes 39 of the focusing electrode 31, the landing accuracy (particularly in the horizontal direction) of the electron beam on the screen 47 deteriorates. Therefore, in one embodiment of the present invention, the structure of the horizontal deflection electrode is changed to the third type.
As shown in the figure, the screen is composed of two comb-shaped reinforcing bars 40, 41 connected at the end 56 and engaged with each other via an appropriate space in the same plane. As shown in FIG. 2, assuming that the comb-shaped conductive plates 42 and 43 projecting to both sides in the vertical direction mesh with each other via an appropriate space, they are accurately processed by etching as a single piece, and while maintaining this shape, as shown in FIG. Then, after mutual positioning with other electrodes and bonding and fixing via the spacer 52, the end portion 56 is cut to electrically separate the comb-shaped reinforcing bars 40, 41. In one embodiment of the present invention, first, as shown in FIG.
After bonding and fixing with the bonding glass 51 applied to the surface of the horizontal deflection electrode 32, the end 56 of the horizontal deflection electrode 32 is blown off by the laser beam 57. In FIG. 4, 58 and 59 are focusing electrodes 32 and spacers 52.
This is a relief hole for the laser beam provided in the. After fusing by the laser beam, bonding and fixing to another electrode are performed via the spacer 52 as shown in FIG. In this way, the structure of the horizontal deflection electrode 32 is composed of two comb-teeth reinforcing bars engaged with each other and the comb-teeth-shaped conductive plate protruding from the comb-teeth reinforcing bars. It is only necessary to cut the end portion of the substrate, and the time for processing and assembling is remarkably reduced. Further, even if there is a deformation at the time of cutting, the image is not affected, so that a high quality image can be obtained. The end faces of the comb-shaped reinforcing bars 40, 41 where the comb-shaped conductive plates 42, 43 protrude in the vertical direction are respectively sawtooth-shaped 40A, 41A, so that the interval between the reinforcing bars 40, 41 is reduced. It can be made larger than the conventional one, and the vertical deflection action on the horizontal deflection electrode 32 can be reduced. 8 and 9 show the operation in comparison. FIG. 8 shows a conventional example, and FIG. 9 shows an embodiment of the present invention.
The trajectory of the electron beam at 49 is shown. It can be seen that in the conventional example, the electron beam is also deflected in the vertical direction by the horizontal deflection power supply.

In the embodiment of the present invention, when the horizontal deflection electrode is electrically divided, a laser beam is used for fusing. However, if the electrode cutting portion is not deformed and damaged, a method such as press cutting may be used.

Further, in one embodiment of the present invention, when the horizontal deflection electrode is bonded and fixed to another electrode, the end of the horizontal deflection electrode is melted by a laser beam after being fixed to the focusing electrode, but only the vertical deflection electrode and the spacer are used. It is also possible to blow off the rear end of the joint. If escape holes are provided in the electrodes and the spacers other than the horizontal deflection electrodes, it becomes possible to fuse and fix the ends of the horizontal deflection electrodes and electrically separate them after fixing all the electrodes.

Advantageous Effects of the Invention As described above, according to the present invention, the structure of the horizontal deflection electrode is composed of two comb-shaped reinforcing bars engaged with each other via an appropriate space in the same plane, and The comb-shaped conductive plates protruding in the vertical direction of the screen on the plane are meshed with each other via an appropriate space, and the end face of the comb-shaped reinforcing bar has a saw-tooth shape, so that the horizontal deflection electrode is electrically divided. When cutting, if the size is about 10 inches, the cut point is 1/10
It is reduced to about 0, mass production becomes possible, and the processing cost can be greatly reduced. In addition, since the portion to be cut is the end of the horizontal deflection electrode, the image of the cut portion is not affected, and a high-quality image can be obtained.

Further, the vertical deflection effect on the beam of the horizontal deflection electrode can be reduced, and this prevents the drive voltage waveform of the vertical deflection electrode from being complicated in order to correct the vertical deflection effect of the horizontal deflection electrode. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing the internal structure of an image display device according to an embodiment of the present invention. FIG. 2 is a front view showing a method of bonding and fixing electrodes according to an embodiment of the present invention. FIG. 1 is a plan view showing a horizontal deflection electrode according to one embodiment of the present invention. FIG. 4 is a cross-sectional view showing an electric dividing method of the horizontal deflection electrode according to one embodiment of the present invention. FIG. 6 is a partial plan view showing a conventional horizontal deflection electrode. FIG. 7 is an essential part exploded perspective view showing the internal structure of an image display device having a conventional comb-shaped horizontal electrode. Fig. 8, ninth
The figure is a diagram for comparing and explaining the effects of the conventional example and the present invention. 27 ... Back electrode, 28a, 28b, 28c ... Line cathode, 29 ... Extraction electrode, 30 ... Signal electrode, 31 ... Converging electrode, 32 ...
Horizontal deflection electrodes, 33a, 33b ... Vertical deflection electrodes, 40, 41 ...
Comb-shaped reinforcing bars, 42, 43 ... Comb-shaped conductive plates, 40A, 41A ... Serrated comb-shaped reinforcing bars.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mitsunori Yokomakura 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In company

Claims (1)

(57) [Claims] A back electrode extending from the back to the front of the screen;
In a flat display device in which a linear cathode, an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, a vertical deflection electrode, and a screen plate are arranged as an electron beam source, and these are housed inside a flat glass bulb vacuum, The deflecting electrode is composed of two comb-shaped reinforcing bars engaged with each other via an appropriate space on the same plane parallel to the screen plate. An image display having a structure in which the comb-shaped conductive plates projecting in the vertical direction of the comb mesh with each other via an appropriate space, and the end surface of the comb-shaped conductive plate of the comb-shaped reinforcing bar has a saw-tooth shape. apparatus.