JPS62208530A - Image display device - Google Patents

Abstract

PURPOSE:To make a very beautiful image without a horizontal line or chromatic irregularity, by making a vertical deflection electrode of a metal, providing electrode portions on electric insulator layers on surfaces, through which an electron beam passes, and conjoining the metal portion of the vertical deflection electrode to a vertical convergence electrode. CONSTITUTION:A vertical deflection electrode 4 is made of a metal. Electrode portions 13a, 13b are provided on electric insulator layers 32, 33 on the surfaces of the vertical deflection electrode 4, through which an electron beam passes. The metal portion of the vertical deflection electrode 4 is conjoined to a vertical convergence electrode. It is preferable for the electric insulator layers, 32, 33 that glass pieces 34, 35 are secured with frit to the surfaces of the vertical deflection electrode 4, through which the electron beam passes. As a result, the vertical deflection electrode 4 warps, the warping can be corrected to secure the electrode in a straight state to make a beautiful image without a horizontal line or chromatic irregularity. Besides, an image display device is prevented from cracking, chipping or the like.

Description

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

Conventional technology Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a much longer depth than the screen, making it difficult to manufacture thin television receivers. Although artwork display elements and the like have been developed, they are all insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display, and have not been put into practical use.

Therefore, as a device that can display color television images on a flat display device using electron beams, the screen on the screen is vertically divided into multiple sections, and the electron beam is vertically applied to each section. It is deflected in the direction to display a plurality of lines, and further divided into a plurality of sections in the horizontal direction, and phosphors such as R, G, and B are sequentially emitted in each section, and the R, G, Some devices display a television image as a whole by controlling the amount of electron beam irradiation onto a phosphor such as B using a color video signal.

FIG. 3 shows its basic configuration. In FIG. 3, from the back to the front, in order: back electrode 1, line cathode 2 as an electron beam source, vertical focusing electrodes sa, 3b, vertical deflection electrode 4, electron beam flow control electrode 5, and horizontal focusing electrode 6.
a and 6b, a horizontal deflection electrode 7, an electron beam acceleration electrode 8, and a glass container 9.22 are arranged, and the components are housed in the glass container and evacuated.

Next, a method for manufacturing the above device will be explained with reference to FIG. After the back electrode 1 and the horizontal deflection electrode 7 are fixed to each other at predetermined intervals and positioned in the in-plane direction of the electrodes by the coupling spacer 23, they are housed in a glass container to complete the image display device. Ru. Here, the positioning in the electrode in-plane direction between the electrodes is 1.2.3 &, 3b, 4, 6,
A positioning pin 26 is used to commonly pass through a positioning hole 24 precisely drilled in each electrode 6 and 7, an electron beam source holding means, and an accelerating electrode holding means (both not shown). When fixing each electrode, due to the manufacturing process, a method is adopted in which the area from the electron T-beam flow control electrode to the horizontal deflection electrode is divided into several units, and after the units are fixed, the units are fixed together. There is.

This is because the electron beam flow control electrode unit and the horizontal deflection electrode unit constitute electrical electrodes and must be divided into a part to which a 10 charge is applied and a part to which a negative charge is applied. However, since these patterns have extremely small slit widths and extremely thin plate thicknesses, it is difficult to bake and fix them in a divided state. Therefore, the electron beam flow control electrode and the horizontal deflection electrode are usually baked and fixed to form a unit, and then the electrode pattern is divided by a method such as a laser. As shown in FIG. 6 or 7, a conventional vertical deflection electrode is a unit (A) in which a back electrode 1, a cathode 2, a vertical deflection electrode 4, and an electron beam flow control electrode 6 to a horizontal deflection electrode 7 are combined by firing. This is done by positioning holes that are accurately drilled in the fixing frame 26 and a positioning pin that commonly passes through the positioning hole (not shown), while being positioned at a predetermined interval and in the direction in the electrode plane. 8 is fixed to the electron beam accelerating electrode frame 27 and connected to the aforementioned electrode frame 27 via a support pin 28.
It is fixed and assembled using the locating pins. FIG. 7 shows a plan view when the vertical deflection electrode 4 is assembled to the fixed frame 26.

Problems to be Solved by the Invention However, in the above configuration, since the vertical deflection electrode 4 is made of glass, it is extremely difficult to suppress the flatness (warpage) to 10 μm or less due to the manufacturing process. In addition, in order to maintain accuracy when inserted into the fixed frame 26, it is necessary to ensure sufficient accuracy of the fixed frame 26 (parallelism, perpendicularity, flatness, etc. of the left and right grooves), and the machining becomes extremely difficult. This is difficult and requires an extremely large amount of processing and assembly man-hours to ensure accuracy. Also, even if the accuracy of flatness (warp) is ensured when the vertical deflection electrode is inserted into the fixing frame 26, the direction of warp is not fixed, so the vertical focusing electrodes sa, 3b and the electron beam flow control electrode 6 are used during assembly. Since it is clamped, warping 29 will occur. This warp 29 appears as a horizontal line or color unevenness in the image. Furthermore, since the vertical deflection electrode is made of glass, if chipping occurs during handling or assembly and a piece of glass enters the slit of the electrode, the electron beam will be charged and a black spot will appear in the image. Furthermore, cracks occur due to vibrations and impacts, making it impossible to display images.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
The vertical deflection electrode is made of metal, and an electrode part is formed on the surface of the vertical deflection electrode through which the electron beam passes through an insulating layer, and the metal part of the vertical deflection electrode is bonded to a vertical focusing electrode. It is prepared. Preferably, the insulating layer is formed by bonding and fixing glass with a frit on the surface of the vertical deflection electrode through which the electron beam passes.

Operation According to the present invention, the vertical deflection electrode is made of metal and this metal part is bonded to the vertical focusing electrode, so that even if warp occurs in the vertical deflection electrode, the warp can be corrected and straightened. By being able to fix it, a beautiful image without horizontal lines or color unevenness can be obtained, and an image display device without cracks, chips, etc. can be obtained.

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

In FIG. 3, from the back to the front, in order: a back electrode 1, a line cathode 2 as an electron beam source, a vertical focusing electrode 3a,
sb, a vertical deflection electrode 4, an electron beam flow control electrode 5, horizontal focusing electrodes 6a and 6b, a horizontal deflection electrode 7, an electron beam acceleration electrode 8, and glass containers 9 and 22. The components are stored in a vacuum chamber. The operation of the image display device configured as described above will be described below. First, a line cathode 2 serving as an electron beam source is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction. Although only four line cathodes 2A to 22 are shown here, it is assumed that 15 line cathodes are actually provided.) For example, 10 line cathodes 2 are provided.
An oxide cathode material is coated on the surface of a tungsten wire with a diameter of ~20 μm. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode 2a 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 that 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 adhered to the inner surface of the rear wall of the glass pulp.

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
ar/'i, a conductive plate 11 having a horizontally long slit 1Q facing each of the line cathodes 2i to 2yo,
The electron beam emitted from the line cathode 2 is passed through the slit 10.
and vertically focused. The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be a row of through holes provided horizontally at small intervals (so that they almost touch each other). Alternatively, it may be configured as a slit. The vertical focusing electrode 3b is also similar. A plurality of vertical deflection electrodes 4 are arranged horizontally at intermediate positions between the slits 10, and electrode portions 13a are provided on the upper and lower surfaces of the insulating substrate 12, respectively.

13b (see FIG. 1). And electrode parts 13a facing each other.

A vertical deflection voltage is applied between 13b and deflects the electron beam in the vertical direction. In this configuration example, a pair of electrode parts 1
The electron beam from one line cathode 2 is vertically deflected to a position corresponding to 16 lines by sa and 13b. and,
The 16 vertical deflection electrodes 4 constitute 16 conductor pairs corresponding to each of the 15 line cathodes 2, and as a result,
The electron beam is deflected so as to draw 240 horizontal lines on the screen 21. Next, the electron beam flow control electrode 5
Each of these conductive plates 16 has a long slit 14 in the vertical direction, and a plurality of conductive plates 16 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 5 divides the electron beam horizontally into one picture element and extracts the electron beam, and
The amount of passage is controlled according to the video signal for displaying each picture element. Therefore, if 32,020 electron beam flow control electrodes 6 are provided, 3)2o picture elements can be displayed per horizontal line. Furthermore, in order to display images in color, each picture element is displayed using phosphors of three colors, R, G, and H, and each electron beam flow control electrode 5 has the R, G color.

Each video signal of B is added sequentially. 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 6a has a plurality of vertically long electrodes (32
Consisting of a conductive plate 17 having 0 slits 16,
The electron beam for each pixel divided in the horizontal direction is focused in the 7"L-'fR horizontal direction to form a fine electron beam. The horizontal deflection electrode 7 is placed in the middle of each of the slits 16 in the vertical direction. A plurality of conductive plates 1 are arranged as follows.
8, a horizontal deflection voltage is applied between each of them to deflect the electron beam of each picture element in the horizontal direction, and to light each of the R, G, and H phosphors on the screen 21. Irradiate them sequentially to make them emit light. The deflection range is
Each electron beam has a width of one picture element. The electron beam accelerating electrode 8 is composed of a plurality of conductive conductors a19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 21 with sufficient energy. The screen 21 is constructed by coating the back surface of the glass container 9 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown).

The phosphor 20 has three color phosphors of R, G, and H for one slit 14iC of the electron beam flow control electrode 6, that is, for each one electron beam divided in the horizontal direction. They are provided in pairs and are applied in stripes in the vertical direction. In FIG. 3, broken lines drawn on the screen 21 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and two-dot chain lines indicate each of the plurality of electron beam flow control electrodes 5. Shows the horizontal divisions displayed corresponding to. As shown in an enlarged view in FIG. 4, one section partitioned by these two has R, G, and B phosphors 20 for one pixel in the horizontal direction, and one pixel in the vertical direction.
It has a width of 6 lines.

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 compartment is, for example, one sieve in the horizontal direction and 16 stages in the vertical direction. Note that in FIG. 4, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction for clarity.

In addition, although only one pair of R, G, and H phosphors 20 are provided for one picture element for one electron beam flow control electrode 5, that is, for one electron beam, two or more picture elements are provided. Of course, the electron beam flow control electrode 5 may be
R, G, and B video signals for two or more picture elements are sequentially applied to the pixel, and horizontal deflection is performed in synchronization with the R, G, and B video signals for two or more picture elements.

In FIG. 1, a vertical deflection electrode 4 made of metal 30 is provided with a glass (insulating layer) 34 via frits 32 and 33 with a thickness of approximately 0.2" on at least two surfaces through which the electron beam passes.
．． The thickness of this glass to which 36 is bonded and fixed is about 0.4 mm. This makes insulation possible. At this time, the metal 30 is made larger in the width direction or length direction than the frit and the glass. Furthermore, ITO and Cr are placed on top of this glass.
Alternatively, conductive films 13a and 1sb made of Au or the like are formed on the front and back surfaces to form electrode portions. At this time, one surface 37 or two surfaces of the vertical deflection electrode 4 are left as bare metal (surfaces that are not insulated). This completes the single vertical deflection electrode. At this time, as shown in FIG. 2, this vertical deflection electrode 4 is set in a jig (not shown) that allows positioning of the fixed frame 38 and the vertical deflection electrode 4 in the height direction or pitch direction. Fixed frame.

The vertical deflection electrode is in a state where the glue has been corrected. In the figure, only four are shown. In this state, welding is performed to integrate the fixed frame 38 and the 16 vertical deflection electrodes 4. The vertical focusing electrode 3a is positioned and mounted on the fixed frame 38 and the vertical deflection electrode 4, which are integrated. At this time, the fixed frame 38. The vertical deflection electrode 4 and the vertical focusing electrode 3a are positioned using a jig and a positioning pin (both not shown) that commonly passes through the positioning hole of the vertical focusing electrode 3a. Welding is performed at the portions that come into contact with each of the vertical focusing electrodes 3a and the vertical deflection electrodes 4 (the bare metal portions of the vertical deflection electrodes mentioned above). The welding location may be one location in the center of the vertical deflection electrode 4, or may be welded at multiple locations along the entire length, or may be continuous welding.

As a result, a vertical deflection electrode block including the vertical deflection electrode 4 and the vertical focusing electrode 3a is completed. In this way, the jig is used to correct warpage and hold it. At the same time, after the positioning in the pitch direction or the height direction is performed reliably, it can be fixed by welding, resulting in a vertical deflection electrode block that can ensure accuracy.

Effects of the Invention As described above, the present invention comprises a vertical deflection electrode made of metal, an electrode portion formed on the surface through which the electron beam passes through an insulating layer, and a metal portion of the vertical deflection electrode bonded to a vertical focusing electrode. By doing so, it is possible to correct the warpage of the vertical deflection electrode, resulting in a very beautiful image without horizontal lines or color unevenness, and since there is no part that comes into contact with the glass, there is no chipping, and therefore the image is Since black spots, which are defects, are eliminated, and furthermore, there is no possibility of cracking due to vibration, impact, etc., reliability as an image display device is improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a vertical deflection electrode according to an embodiment of the present invention, Fig. 2 is a partial cross-sectional perspective view showing the vertical deflection electrode, a frame, and a vertical focusing electrode placed thereon, and Fig. 3 is an image. FIG. 4 is an enlarged plan view of the same screen; FIG. 5 is an exploded perspective view of the image display device showing a conventional electrode manufacturing method; and FIG. 6 is an exploded perspective view of the image display element used in the display device. FIG. 7, which is a sectional view of electrode manufacturing, is a plan view of a conventional example in which a vertical deflection electric bed is inserted into a fixed frame. 1...Back electrode, 21...Screen, 9, 22...Glass container, 4...Vertical deflection electrode, 32.33...Frit (insulating layer),
34.35...Glass (insulating layer), 13a, 1
3b... Electrode, 3a... Vertical focusing electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person +m
11 Inquiry about the injury 3 mountains - 0 Ken VC food n Fig. 4 Fig. 5

Claims (2)

[Claims] (1) Provide multiple electrodes between the back electrode and the screen,
Components such as a back electrode, a plurality of electrodes, and a screen are inserted into a container, and among the plurality of electrodes of the image display device to be sealed, the vertical deflection electrode is made of metal, and an insulating layer is provided on the surface through which the electron beam passes. An image display device characterized in that an electrode portion is formed through the vertical deflection electrode, and a metal portion of the vertical deflection electrode is joined to the vertical focusing electrode. (2) The image display device according to claim 1, wherein the metal of the vertical deflection electrode is made larger in the width direction and length direction than the insulating layer.