JPH0533489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a flat display device for video equipment.

Conventional configurations and their problems Traditionally, 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 use for thin TVs. It was impossible to produce a Zion receiver. In addition, as flat display elements, EL display elements, plasma display devices,
Although liquid crystal display elements and the like have been developed, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility of color display, and have not yet been put into practical use. Therefore, the aim was to create a device that could display color television images on a flat display device using electron beams, and the screen was divided vertically into multiple sections. Each time, the electron beam is vertically deflected to display a plurality of lines, and the electron beam is further divided horizontally into a plurality of sections, and phosphors such as R, G, and B are sequentially emitted in each section. That R,
A television image is displayed as a whole by controlling the amount of electron beam irradiation on phosphors such as G and B using color video signals.

As shown in FIG. 1, the conventional image display element has, in order from the back to the front, a back electrode 1, a line cathode 2 as an electron beam source, vertical focusing electrodes 3, 3', and a vertical deflection electrode 4. , an electron beam flow control electrode 5, a horizontal focusing electrode 6, a horizontal deflection electrode 7, an electron beam accelerating electrode 8, and glass containers 9, 22 are arranged. do. 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.
A plurality of such linear cathodes 2 are provided in the vertical direction at appropriate intervals (only four cathodes 2A to 2D are shown here). In this embodiment, it is assumed that 15 tubes are provided, and the number is 2i to 2yo. These wire cathodes 2 are constructed by applying an oxide cathode material to the surface of a tungsten wire having a diameter of 10 to 20 μΦ, for example. Then, as described later, the upper line cathode 2
The electron beams are controlled to emit electron beams for a certain period of time in order from A to A.

The back electrode 1 creates a potential gradient with a vertical focusing electrode 3, which will be described later, and prevents the generation of electron beams from other line cathodes 2 other than the line cathode 2 which is controlled to emit electron beams for a certain period of time. It has the function of suppressing the electron beam and pushing the generated electron beam forward only. The back electrode 1 may be formed by a coating of electrically conductive material applied to the inner surface of the rear wall of the glass bulb. In addition, these back electrodes 1
Instead of the linear cathode 2, a planar electron beam emitting cathode may be used. Vertical focusing electrode 3 is line cathode 2
It is a source plate 11 having horizontally long slits 10 facing each of the line cathodes 2 and 2.
The electron beam emitted from the electron beam is extracted through the slit 10 and focused vertically.

The slit 10 may be provided with crosspieces at appropriate intervals in the middle, or may be substantially configured as a slit by a row of through holes arranged horizontally at small intervals (nearly touching each other). may have been done. The vertical focusing electrode 3' is also similar. The vertical deflection electrode 4 is connected to the slit 1 above.
A plurality of conductors 13 and 13' are arranged horizontally at intermediate positions between each of the insulating substrates 12, respectively. Then, a vertical deflection voltage is applied between the opposing conductors 13 and 13',
Deflect the electron beam vertically.

In this configuration example, the electron beam from one line cathode 2 is vertically deflected to positions corresponding to 16 lines by a pair of conductors 13, 13'. The 16 vertical deflection electrodes 4 constitute 15 pairs of conductors corresponding to each of the 15 pairs of line cathodes 2, and the electron beams are arranged so as to draw 240 horizontal lines on the screen 9. to deflect. Next, control electrode 5
Each of these conductive plates 15 has a vertically long slit 14, and a plurality of conductive plates 15 are arranged horizontally 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 control electrodes 5 extracts the electron beam horizontally by dividing it into one picture element at a time, and controls the amount of electron beam passing therethrough in accordance with a video signal for displaying each picture element.

Therefore, if 320 control electrodes 5 are provided, 320 picture elements can be displayed per horizontal line. Also, in order to display images in color, each picture element is R,
Display is performed using phosphors of three colors, G and B, and the R, G, and B video signals are sequentially applied to each control electrode 5. Furthermore, 320 sets of video signals for one line are simultaneously applied to the 320 control electrodes 5, and the video for one line is displayed at one time. Horizontal focusing electrode 6
is composed of a conductive plate 17 having a plurality of vertically long slits 16 (320 slits 16) facing the slits 14 of the control electrode 5. The beam is focused into a narrow beam of electrons. 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 conductive plate 18 for each picture element. The electron beams of R, G, and B are respectively deflected in the horizontal direction and
Each of the phosphors is sequentially irradiated 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 composed of a plurality of conductive plates 19 provided horizontally at the same position as the vertical deflection electrode 4, and accelerates the electron beam so that it collides with the screen 9 with sufficient energy.

The screen 9 is constructed by coating the back surface of a glass container 21 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown). The phosphor 20 is arranged for each slit 14 of the control electrode 5, that is, for each horizontally divided electron beam.
Pairs of phosphors of three colors, R, G, and B, are provided and are applied in stripes in the vertical direction. In FIG. 1, the broken lines drawn on the screen 9 indicate divisions in the vertical direction that are displayed corresponding to each of the plurality of line cathodes 2, and the two-dot chain lines correspond to each of the plurality of control electrodes 5. Indicates the horizontal division displayed. As shown in the enlarged view in Figure 2, one section partitioned by these two has R, G, and B phosphors 20 for one picture element in the horizontal direction, and 16 lines in the vertical direction. It has a width.
For example, the size of one section is 1 in the horizontal direction.
mm, and the vertical direction is 16 mm.

Note that in FIG. 1, the length in the horizontal direction is greatly enlarged relative to the length in the vertical direction for clarity.
Further, in this embodiment, R, G, and B phosphors 2 are used for one control electrode 5, that is, for one electron beam.
Although only one pair of 0 is provided for one picture element, it is of course possible to provide two or more picture elements, and in that case, the fresh fish electrode 5 has R, R, for two or more picture elements.
G and B video signals are applied sequentially, and horizontal deflection is performed in synchronization with them.

The firing and fixing of each electrode is performed as shown in FIG.
The positioning pins 24 provided on the firing jig 23 are inserted into the positioning holes of each electrode 25, and a spacer 26 whose surface is coated with a glass adhesive is placed between each electrode 25.
This is done by inserting the spacer 26, pressurizing it from the direction of arrow Z with a stamper 27, and heating it to the melting/recrystallization temperature of the glass adhesive applied to the surface of the spacer 26. 28 is a sheet for protecting the baking jig 23 and stamper 27.

However, in such a baking fixing method, the temperature of the baking jig 23 and the stamper 27 is not uniform, and the glass adhesive applied to the surface of the spacer 26 is not uniformly melted, resulting in the electrode block being baked and fixed. There may be uneven thickness in the direction of arrow Z,
Since the residual stress generated in each electrode after firing and fixing was non-uniform, the mutual positional deviation of each electrode occurred. When using an electrode block with such uneven thickness or misalignment of the electrodes, the boundaries between the vertically divided screens may become clear.
This had a major drawback as an image display device in that color unevenness occurred.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention eliminates uneven thickness and mutual positional deviation of electrode blocks by firing and fixing each electrode and spacer using a firing jig and stamper having through holes in a flat plate, thereby improving reliability. The present invention provides a method for manufacturing a high quality image display device.

Structure of the Invention The present invention includes a back electrode, a line cathode as an electron beam source, a vertical focusing electrode, a vertical deflection electrode, an electron beam flow control electrode, a horizontal focusing electrode, a horizontal deflection electrode, an electron beam accelerating electrode, a spacer, and a screen plate. , a method for manufacturing a flat display device in which these are housed in a vacuum inside a flat glass bulb, wherein a spacer is inserted between the vertical focusing electrode, the electron beam flow control electrode, the horizontal focusing electrode, and the horizontal deflection electrode and fixed by firing. In this case, since the flat plate is heated while being pressurized using a firing jig and stamper with through holes, there is no uneven thickness of the electrode block or misalignment of each electrode due to uneven temperature of the firing jig and stamper, resulting in a beautiful product. This has the effect of providing a screen.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows a firing jig in one embodiment of the present invention. In FIG. 4, 29 is a firing jig. Reference numeral 30 indicates through holes provided at regular intervals in the firing jig. 31
are each electrode, and a spacer 3 is provided between each electrode 31.
2 has been inserted. The mutual position of each electrode 31 and spacer is performed by inserting each electrode 31 and spacer into positioning pins 33 set vertically on the firing jig 29. 34 is a stamper in which through holes 35 are provided at regular intervals. During firing and fixing, each electrode 31 and spacer 32 is pressurized by the stamper 34 in the direction of arrow Z, and heated in an atmospheric furnace to the melting and recrystallization temperature of the glass adhesive applied to the surface of the spacer 32. At this time, since the firing jig 29 and the stamper 34 are provided with through holes 30 and 35 at regular intervals, each electrode 31 and the spacer 32 are uniformly heated at a temperature close to the atmosphere.
The glass adhesive applied to the surface melts and recrystallizes almost simultaneously over the front surface, completing the bonding.
In this example, it is made of SUS304 and has a size of 300 x 300 x 20.
A through hole of φ10 was made in the plate material, and experiments were conducted on two types of cases where the volume of the through hole part and the volume of the flat plate part were 1:1 and 1:2.If it was 1:1, the electrode part during firing Temperature variation within 30℃, 1:
In case 2, the temperature was within 35°C, which enabled more uniform heating compared to the conventional temperature variation of 60°C without through holes.

In this embodiment, a round hole that is easy to process is used as the through hole, but any shape may be used as long as it is a through hole.

Effects of the Invention As described above, in the present invention, each electrode and spacer is baked and fixed using a baking jig and a stamper that have through holes in a flat plate, so that uniform heating is achieved and the thickness unevenness of the electrode block is reduced from 80 μm in the conventional method. 50μm,
The mutual positional deviation of each electrode is now 20 μm, compared to the conventional 50 μm, which improves the landing accuracy of the electron beam and greatly contributes to improved image quality.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the basic structure of an image display element used in a conventional image display device, FIG. FIG. 4 is a sectional view showing a firing fixing method in an embodiment of the present invention. 29... Baking jig, 30, 35... Through hole, 3
1... Each electrode, 32... Spacer, 34... Stamper.

Claims (1)

[Claims] 1 Equipped with a back electrode, a line cathode as an electron beam source, a vertical focusing electrode, a vertical deflection electrode, an electron beam flow control electrode, a horizontal focusing electrode, a horizontal deflection electrode, an electron beam accelerating electrode, a spacer and a screen plate, and A method for manufacturing a flat display device housed inside a vacuum of a glass bulb, wherein spacers are inserted between the vertical focusing electrode, the horizontal focusing electrode, and the horizontal deflection electrode, and when fixed by firing, a plurality of spacers are inserted into the flat plate. A method for manufacturing a flat display device, which involves heating while applying pressure using a firing jig and stamper provided with through holes.