JPS6237851A - Image display device - Google Patents

Abstract

PURPOSE:To make a high-definition image with no transverse line and reduce weight, by providing an acceleration electrode with ribbon-like metal sheets having curved portions and extending perpendicularly to the directions of proceeding of electron beams and with pipes supporting the sheets. CONSTITUTION:An acceleration electrode 38 is provided with ribbon-like metal sheets 49 having curved portions and extending perpendicularly to the directions of proceeding of electron beams and with pipes 50 to which the sheets are secured to be supported. As a result, the rigidity of the acceleration electrode 38 is increased so that the deformation thereof by a coulomb force is made very small. For that reason, the accuracy of vertical deflection of the electron beam by the electrode 38 at the central portion thereof is equalized to that at both the ends thereof. An overlapped portion is thus removed from an image to eliminate a transverse line to heighten the definition of the image. Since a high tensile force does not need to be applied to the electrode 38 at all, the rigidity of a support frame 51 can be diminished to reduce the weight of an acceleration electrode assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device for video equipment.

BACKGROUND OF THE INVENTION Conventionally, cathode ray tubes have been mainly used as two-page display elements for displaying color television images.
Conventional cathode ray tubes have a much longer depth than the screen, making it impossible to manufacture thin television receivers. In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have been developed in recent years as flat display elements, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color displays. However, K has not yet been put into practical use. Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen on the screen vertically into multiple sections. In each case, the electron beam is vertically deflected to display a plurality of lines, and then it is divided horizontally into a plurality of sections, and fluorescers such as R, G, and B are sequentially emitted in each section. , the amount of electron beam irradiation to the R, G, B, etc. phosphors is controlled by a color video signal to display a television image as a whole. Hereinafter, an example of page -3 of a conventional image display element will be described with reference to the drawings. FIG. 2, FIG. 3, and FIG. 4 show conventional image display elements. In FIG. 2, from the rear to the front, 1 is a back electrode, 2 is a line cathode as an electron beam source, 3 and 3' are vertical focusing electrodes, 4 is a vertical deflection electrode, 5 is an electron beam flow control electrode, 6 and 6'
It consists of a horizontal focusing electrode, 7 a horizontal deflection electrode, 8 an electron beam accelerating electrode, and a 9°22 glass container. The components are housed in the glass container 22 and evacuated. The operation of the image display device configured as described above will be described below. First, two line cathodes as electron beam sources are horizontally stretched so as to generate electron beams distributed linearly in the horizontal direction, and a plurality of these two line cathodes are arranged vertically at appropriate intervals. There are books (only four books 2-2 are shown here). In this example, it is assumed that 15 are provided, and 2
Let's say I~2yo. These line cathodes 2 are, for example, 10 to 2
An oxide cathode material is coated on the surface of a tungsten wire with a diameter of 0 μm. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2 for a fixed period of time. The back electrode 1 suppresses the generation of electron beams from line cathodes 2 other than the line cathode 2 which is controlled to emit electron beams for a certain period of time, which will be described later, and directs the generated electron beams only in the forward direction. It has the effect of pushing out toward the target. The back electrode 1 may be formed by a coating film of a conductive material deposited on the inner surface of the rear wall of the glass bulb.

Further, instead of the back electrode 1 and the linear cathode 2, a planar electron beam emitting cathode may be used. Vertical focusing electrode 3
is a conductive plate 11 having horizontally long slits 10 facing each of the line cathodes 2a to 2y; bars may be provided at intervals of the electron beams emitted from the line cathodes 2; The through holes may be substantially configured as slits by a row of a large number of through holes arranged side by side at small intervals (intervals such that they almost touch each other) in the direction. The vertical focusing electrode 3' is also similar. A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions of the slits 10 described above on page 5, and conductors 13 and 13' are provided on the upper and lower surfaces of the insulating substrate 12, respectively. It is made up of things. And the opposing conductors 13.13
A vertical deflection voltage is applied between ' and deflects the electron beam in the vertical direction. In this configuration example, a pair of conductors 1.3
．． 13' deflects the electron beam from one line cathode 2 to positions corresponding to 16 lines in the vertical direction. And 16
The vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 line cathodes 2, and the electron beam is ultimately deflected to draw 240 horizontal lines on the screen 21. Next, the electron beam flow control electrodes 6 are formed by conductive plates 1 each having a vertically long slit 14.
6, and a plurality of them are arranged in parallel in the horizontal direction at predetermined intervals.

In this configuration example, 320 control electrode conductive plates 15a to
15n are provided (only 10 are shown in the figure). Each of the electron beam flow control electrodes 6 separates and extracts the electron beam horizontally into six pages each corresponding to one picture element, and 1. The amount of passage is controlled according to the video signal for displaying each picture element.

Therefore, if 82,020 electron beam flow control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line. In addition, in order to display images in color, each picture element is R,
Display is performed using phosphors of three colors, Ci and B, and RGB video signals are sequentially applied to each electron beam flow control electrode 6. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 electron beam flow control electrodes 5, so that one line of video is displayed at one time. The horizontal focusing electrode 6 has a plurality of vertically long slits 16 (320 slits) facing the slits 14 of the electron beam flow control electrode 6.
It is composed of a conductive plate 17 having a conductive plate 17, and focuses electron beams for each picture element divided horizontally into fine electron beams in the horizontal direction. The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 arranged vertically in the middle of each of the slits 16, and a horizontal deflection voltage is applied between each of the conductive plates 18 to /゛The electron beam for each picture element is deflected in the horizontal direction, and the R, G, and H phosphors are sequentially irradiated on the screen 21 to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam. The accelerating electrode 8 is, for example, a tungsten wire with a diameter of 50μ to 1oO7L, and is composed of a plurality of conductive wires 19 installed horizontally at the same position as the vertical deflection electrode 4, and is configured to provide sufficient energy to the electron beam. Accelerate so as to collide with the screen 21. The screen 21 is constructed by coating the back surface of the glass container 9 with a phosphor 2o that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor 2o is an electron beam flow control electrode 5
0 For one slit 14, that is, for each one electron beam divided in the horizontal direction, three of R, G, and B
Pairs of colored phosphors are provided and are applied in vertical stripes. Screen 21 in Figure 3
The broken lines shown in the figure indicate divisions in the vertical direction corresponding to each of the plurality of electron beam flow control electrodes 2, and the two-dot chain lines indicate the divisions in the vertical direction corresponding to each of the plurality of electron beam flow control electrodes 5. Indicates the corresponding horizontal division. As shown in the enlarged view in Figure 3, one section partitioned by these two has two R, G, and B phosphors for one picture element in the horizontal direction.
0, and has a width of 16 lines in the vertical direction. Note that in the figure, A is one section in the vertical direction, and B is one section in the horizontal direction. The size of one section is, for example,
There is one tower in the horizontal direction and 16 barrels in the vertical direction. Also, the third
Please note that in the figure, the horizontal length is greatly expanded relative to the vertical direction for clarity.

In this embodiment, R, G, and B phosphors 2 are used for one electron beam flow control electrode 5, that is, for one electron beam.
Although only one pair of 0's is provided for each picture element, it is of course possible to provide two or more picture elements, and in that case, the electron beam flow control electrode 6 has R, Ci, B
Video signals are applied sequentially, and horizontal deflection is performed in synchronization with the video signals.

Problems to be Solved by the Invention Page 9 However, in the above configuration, when a voltage is applied to each electrode, the accelerating electrode 8 to which a particularly high voltage is applied
A Coulomb force is generated between the horizontal focusing electrode 6' and the horizontal focusing electrode 6' on the low voltage side. The horizontal focusing electrode 6' is connected to the vertical focusing electrode 3', the vertical deflection electrode 4. Electron beam flow control electrode5. Horizontal focusing electrode 6.
Since the horizontal deflection electrode 7 and the metal material are bonded via a bonding spacer (not shown) coated with glass on both sides, the rigidity is much greater than that of the acceleration electrode 8, and deformation due to Coulomb force is almost ignored. However, since the accelerating electrode 8 has low rigidity, the horizontal focusing electrode 6'
It is pulled to the side and bends as shown by the broken line in Figure 4. Furthermore, when electrons are emitted from the linear cathode 2, when focusing on the field formed by the linear cathode 2 and the vertical focusing electrode 3, a current flows from the vertical focusing electrode 3 side to the linear cathode 2 side. Since the wire cathode 2 has electrical resistance, this current flowing into the wire cathode 2 creates a potential difference between the center and both ends of the wire cathode 2, and the back electrode 1. Line cathode 2. A difference occurs in the electron beam generation system consisting of the vertical focusing electrode 3.

As a result of the above two phenomena, as shown in FIG. 5, the vertically deflected electron beam on the screen 21 is largely deflected in the vertical direction at the central part, and at the boundary between the areas covered by the line cathodes 2a and 2b. The part where the electron beams overlap (
In FIG. 5, a hatched area) appears as a horizontal line in a multi-image image whose brightness is brighter than the non-overlapping area, which is a major drawback as an image display device.

In addition, as shown in FIG. 6, in order to reduce the deformation of the accelerating electrode 8 due to the Coulomb force, the accelerating electrode 8 is fixed to a frame 23 with high tension and high rigidity.
Another drawback is that the accelerating electrode block consisting of the frame 23 and the frame 23 is heavy. - In view of the above-mentioned problems, the present invention provides an image display device that has an image of a product without horizontal lines and is lightweight.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
The above-mentioned accelerating electrode is made into an integrated type consisting of a pipe and a ribbon 11 with a curved part and a page-shaped metal plate.

In other words, by applying a high voltage for vertical deflection to an accelerating electrode consisting of a pipe and a ribbon-shaped metal plate with a curved portion, it is possible to deflect an electron beam in the vertical direction in the same manner as in the conventional method. The deformation of the accelerating electrode due to the Coulomb force acting between the accelerating electrode, which is made up of a pipe and a ribbon-shaped metal plate with a bent part to which a high voltage is applied, and the horizontal focusing electrode, which is a low voltage, is caused by the acceleration electrode being Since it is an integral type made of a ribbon-shaped metal plate 75), its rigidity is extremely high, so it is extremely small. Furthermore, the difference in deflection sensitivity in the vertical direction of the electron beam between the center and both ends of the screen due to the potential difference between the line cathodes can be corrected by the curvature of the ribbon-shaped metal plate with the curved part of the accelerating electrode.

As a result, the deflection sensitivity of the electron beam vertically deflected by the accelerating electrode is equal at the center and both ends of the accelerating electrode, so that there is no overlap in the image and horizontal lines are eliminated. In addition, because of the structure in which the pipes are joined, the rigidity is extremely high, making it possible to minimize deformation due to Coulomb force even without the high tension that is conventionally applied to reduce deformation due to Coulomb force. become,
As a result, the highly rigid frame that conventionally fixed and supported the accelerating electrodes is no longer necessary, making it possible to reduce the weight of the accelerating electrode block.

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 an image display device in one embodiment of the present invention. In Figure 1,
In order from rear to front, 31 is a back electrode, 32 is a line cathode, 33 and 33' are vertical focusing electrodes, 34 is a vertical deflection electrode, 35 is an electron beam control electrode, 36 and 36' are horizontal focusing electrodes, and 37 38 is a horizontal deflection electrode, and 38 is an accelerating electrode and a screen plate 53. These components are housed in a evacuated interior of a glass container (not shown). As shown in FIG. 7, the accelerating electrode 13 page pole 38 of the present invention consists of a ribbon-shaped metal plate 49 with a curved part placed perpendicularly to the traveling direction of the electron beam and a pipe 5o supporting this. The accelerating electrode block is composed of an accelerating electrode 38 and a support frame 61 that supports the accelerating electrode 38 and enables positioning thereof. The metal plate 49 with a curved part used in the present invention is an S U with a plate thickness of 0.1 mm and a width of 2.0 mm.
The pipe 50 is made of SUS 430 etching material with an outer diameter of 3 mm and an inner diameter of 2.7 mm. The ribbon-shaped metal plate 49 with a curved part and the pipe 5o should be made of the same material or have similar thermal expansion coefficients, considering the heat load during the process. A bong-shaped metal plate 49 to be rounded is inserted therein and then fixed by a method such as a laser.

Furthermore, the pipe 50 may be a ceramic pipe whose surface is subjected to evaporation or the like.

The image display device configured as above will be explained below using FIG. 8.

Horizontal focusing electrode 36': 650 (V), accelerating electrode 38
: 1o (KV), screen plate 63: 10 (KV). In the field formed by the screen plate 53, the Coulomb force applied to the accelerating electrode 38 per unit length in the horizontal direction of the screen is determined by calculating the electric charge generated on the surface of the accelerating electrode 38 after determining the equipotential polarities in the field. By calculation, fo-11,64×10 (K2/rrrIn) is obtained.

Further, the maximum deflection zlnax of a tension rod that is fixed at both ends and receives a uniformly distributed load is expressed by the following equation.

Zmaw = ('' E:
Young's modulus of accelerating electrode 38 (KP7rJ) 16 bey, Y: Moment of inertia of area of accelerating electrode 38 (-)S
: The tensile force (Ky) applied to the accelerating electrode 38.

In equation (1), if S−o, becomes.

Regarding the accelerating electrode 38 used in this embodiment, the maximum amount of deflection "max" that is deflected toward the horizontal focusing electrode 36' due to the Coulomb force can be calculated using equation (2), zmax=0.99
(μm) However, f0=11. e4x1o (Kp/mm), j
2=218m).

E = 20300 (Kp/in'), Iy = 3.4
16 (g'), and since no tensile force is applied to the accelerating electrode 38, it is S-〇(K).

By the way, when the maximum deflection zmax of the accelerating electrode 8 in the conventional example is deflected toward the horizontal focusing electrode 6' due to the Coulomb force, using equation (1), Z' =
0.99 (μm) However, fo-s, e7x1o-6 (Kp/mm), j2
=218 (am).

E = s9.73x1o3 (Kp/mJ), Iy =
3. ○e a x 1o-7(nan')+S-1.
○(K)). In order to achieve the maximum deflection Zmax = 0.99 (μm) made possible in this example using the conventional method, a tensile force of S = 40 (KP) is required to be applied to the accelerating electrode 8. . Conventional case 1
Because six accelerating electrodes 8 are arranged, the contraction tension is S-8
x16-64o (KP), and it can be seen that an extremely rigid support frame is required in order to accurately position the accelerating electrode 8 while being loaded with this tensile force.

As described above, according to this embodiment, the accelerating electrode 38 has a structure consisting of a ribbon-shaped metal plate 49 with a curved part arranged perpendicularly to the traveling direction of the electron beam, and a pipe 5o for bonding and fixing this. By using such a material, the rigidity of the accelerating electrode 38 is greatly increased, and deformation due to Coulomb force is extremely small. As a result, the deflection sensitivity of the electron beam vertically deflected by the accelerating electrode 38 is equal at the center and both ends of the accelerating electrode 38, so there is no overlamp part in the image, and the line cathode 2a shown in FIG. Ukemotsutare 17
The linearity of the representative beam in the first stage of direct page deflection has made it possible to eliminate horizontal lines such as the black circles shown in FIG.

Effects of the Invention As described above, the present invention provides a ribbon-shaped metal with a curved part arranged perpendicularly to the traveling direction of the electron beam in the accelerating electrode among the plurality of electrodes placed between the back electrode and the screen. By providing a structure consisting of a plate and a pipe that connects and fixes the plate and supports it, it is possible to eliminate defects caused to the image by electrode deflection due to Coulomb force and vertical deflection variation due to the potential difference of the wire cathode, and to produce high-quality images. This has the unique effect of providing an image display device.

Further, according to the present invention, the rigidity of the accelerating electrode is large, and the deflection of the electrode due to Coulomb force is extremely small, so that the high tensile force applied to the accelerating electrode is completely unnecessary. As a result, the rigidity of the support frame that supports and fixes the accelerating electrode can be reduced, making it possible to significantly reduce the weight of the accelerating electrode block.

As described above, if the electrode structure of the image display device of the present invention is 18 pages, it is possible to completely eliminate defects in image quality, and also to significantly reduce the weight and cost of the support frame, and its practical effects. is a great thing.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the basic configuration of an image display device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the basic configuration of an image display device before the present invention, and FIG. 3 is an exploded perspective view of the image display device according to an embodiment of the present invention. Fig. 4 is an exploded perspective view showing the state in which the accelerating electrode is deformed by Coulomb force in a conventional image display device, and Fig. 5 shows the vertically deflected beam when the accelerating electrode is deformed. 6 is a perspective view showing a conventional accelerating electrode and a frame that supports and fixes it. FIG. 7 shows an accelerating electrode and a frame that supports and fixes it in an embodiment of the present invention. The perspective view and FIG. 8 are explanatory views showing the effects of one embodiment of the present invention.

Claims (1)

[Claims] A plurality of wire cathodes and a plurality of electrodes are provided between the back electrode and the screen, and after inserting the components such as the back electrode, the plurality of wire cathodes, the plurality of electrodes, and the screen into a divided glass container,
An image display device sealed via an adhesive frit,
Among the plurality of electrodes, the accelerating electrode includes a ribbon-shaped metal plate with a curved portion arranged perpendicularly to the traveling direction of the beam and parallel to each other in terms of mutual positional relationship; An image display device comprising a pipe arranged to be fixedly connected and supported.