JPH08111173A - Manufacture of flat type image display device - Google Patents

Abstract

PURPOSE: To provide a manufacturing method by which cost reduction and high image quality as an image display device are realized by attaining cost reduction and an improvement in thickness accuracy of an electrode spacer used for the purpose of securing insulation and an interval in an electrode of a flat type image display device. CONSTITUTION: An insulating film 31 is formed on both surfaces of a doughnut- shaped spacer 30 made of SUS by ceramic thermal spraying. Ink by turning crystalline glass frit and resin into paste is once printed on it by using a film on its one side as a backing, and a glass film is formed. This is heated at 350 to 400 deg.C, and a solvent and resin are baked away, and it is formed as only a crystalline glass film 33. Since a thermal spraying film 32 is arranged on the backing, the number of frit printing times is reduced, and thickness accuracy is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat panel image display device in a video equipment.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube has been mainly used as a display element for displaying a color television image, but since a conventional cathode ray tube has a larger depth than a screen, it is not possible to manufacture a thin television receiver. It was possible. Recently, as a flat display element, an EL display element,
Although plasma display elements, liquid crystal display elements, etc. have been developed, they are all insufficient in terms of performance such as brightness, contrast and color reproducibility of color display.

Therefore, as a means for achieving a flat display device by using an electron beam, a new display device has been proposed in Japanese Patent Application Laid-Open No. 1-130453 (Japanese Patent Application No. 62-288762).

This is because the screen on the screen is vertically divided into a plurality of sections, the electron beam is vertically deflected for each section to display a plurality of lines, and further, a plurality of sections are horizontally displayed. The phosphors of R, G, B are sequentially emitted for each division, and the irradiation amount of the electron beam to the phosphors of R, G, B is controlled by a color image signal. To display a television image.

FIG. 3 shows an exploded perspective view of a conventional image display device. In FIG. 3, 1 is a back electrode, 2 is 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 focusing electrode, 7 is a horizontal deflection electrode, 26 Is a shield electrode, 8 is a vertical deflection electrode,
These components are housed in the anode side front case 9 and the back side back case 10, and the inside of the case is evacuated to form the image device. The back electrode 1 is made of a planar conductive material and is provided in parallel with the line cathode 2. Wire cathode 2
Are horizontally stretched so as to generate an electron flow having a substantially uniform current density distribution in the horizontal direction, and a plurality of them are vertically arranged at appropriate intervals (only four are shown in FIG. 7). It is set up. These line cathodes 2 are formed, for example, by coating an oxide cathode material on the surface of a tungsten wire.

The electron beam extraction electrode 3 faces the back electrode 1 through the line cathode 2 and is provided on a horizontal line. A plurality of signal electrodes 4 are vertically elongated conductive plates 1 that are arranged at predetermined positions in each of the through holes 12 of the electron beam extraction electrode 3 so as to face each other in the horizontal direction.
In each conductive plate 17, a similar through hole 1 is formed at a position facing the through hole 12 of the extraction electrode 3 in each conductive plate 17.
Eight. The focusing electrode 5 is the through hole 1 of the signal electrode 4.
8 and a conductive plate having through holes at respective opposing positions.

The horizontal focusing electrode 6 has a through hole 14 in the focusing electrode 5.
And a conductive plate 24 having a through hole at a position facing each other.

The horizontal deflection electrode 7 is arranged in a pair in a vertically elongated comb-teeth-shaped conductive plate so as to face each other in the middle of the row of through holes of the focusing electrode 5 and the horizontal focusing electrode 6 so as to face each other. It is configured to form a horizontal deflection electrode, and has a shelf shape as a whole. The shield electrode 26 is made of a conductive plate having through holes 28 at positions facing the through holes 27 of the horizontal deflection electrode 7.

The vertical deflection electrode 8 has a structure in which two strip-shaped conductive plates are intermeshed with each other on the same plane with an appropriate gap therebetween. For the electron beam 13, for example, a lower conductive plate and an upper conductive plate are provided. Pair of vertical deflection electrodes. The screen 19 is configured by applying a phosphor, which is emitted by irradiation of 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 seams of the image subsections 14 are not visible, it is necessary to process and position each electrode with high accuracy when processing and assembling the electrodes. The intervals between the electron beam extraction electrode 3 and the vertical deflection electrode 8 are all uniform. For this reason, two crystalline glass rods sandwiching an amorphous glass rod for maintaining an electrode interval are formed on the electrode surface.
Line up multiple books. That is, a set of three glass rods is regularly arranged on the electrode plate.

Further, there is a screw hole at the corner of the electrode for fixing the electrode. Insulating spacers (hereinafter referred to as spacers) are arranged between the electrode plates in order to prevent the electrodes from contacting each other when tightening the screws. Therefore, this spacer has the function of adhering to the electrode,
It has the function of ensuring a certain thickness. Therefore, the configuration is S
After forming a plurality of US plates in a donut shape by etching, ceramic plasma spraying (hereinafter referred to as spraying) is performed on one surface to form an insulating layer. Further, a molten glass frit is kneaded with a resin and a solvent and formed into a paste (hereinafter referred to as a frit paste) by printing on the opposite surface.

[0012]

However, the above conventional structure has the following problems. In order to secure the print thickness of the frit paste to a certain level or more, it is usually necessary to print twice or more, and it is necessary to carefully manage the thickness at that time. When printing is repeated a plurality of times, variations in film thickness increase, fine adjustment is required, and this also causes a cost increase in terms of man-hours. The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method for manufacturing a flat-panel image display device that realizes excellent image quality accuracy.

[0013]

In order to achieve this object, the present invention is to perform thermal spraying on both surfaces of a SUS plate, and print frit paste once on one surface of the SUS plate.
It has a structure in which a frit film is formed on the sprayed film.

[0014]

With this configuration, the cost can be reduced and the spacer with high thickness accuracy can be obtained by reducing the number of times of printing to one compared with the current method of single-side thermal spraying and single-sided frit paste printing. Enables performance improvement.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of an SUS plate having a large number of spacers according to an embodiment of the present invention. 140 spacers having an outer diameter of 8.6 mm were formed by using a mold.
The dimensions of the SUS plate are 170 mm × 135 mm.

1 (a) and 1 (b) are a plan view and a side view of a spacer in an embodiment of the present invention. First, as shown in FIG. 1B, a sprayed film 31 having a thickness of 200 μm was formed on the surface on which the burr 34 was generated, on the spacer. Since the size of the burr is 10 μm or less, there is no possibility of causing insulation failure. Next, a sprayed film 32 having a thickness of 40 μm is formed as a base on the opposite surface. After that, the frit paste 33 having a thickness of 40 μm is formed on the sprayed film 32 by screen printing. Further, heating is performed at 350 to 400 ° C. so that the solvent and the resin in the coating film are decomposed and scattered. This is sandwiched between electrodes at a position such as the spacer 30 in FIG. 3 and fired, so that both functions of securing space and adhering can be obtained.

The frit paste 33 was obtained by dissolving ethyl cellulose in a resin and kneading the crystalline glass frit. It is important that this resin decomposes and scatters by heating at 350 to 400 ° C. Therefore, the resin is not limited to ethyl cellulose, and any resin that decomposes and scatters under the conditions may be used. As another example, nitrocellulose can also be used.

[0019]

As described above, according to the present invention, it is possible to obtain a spacer having a high thickness accuracy at a low cost and to realize a flat image display apparatus having an improved image quality accuracy.

[Brief description of drawings]

1A and 1B are projected views of a spacer in an embodiment of the present invention.

FIG. 2 is a perspective view of a spacer formed on a SUS plate according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of the image display device.

[Explanation of symbols]

 30 Electrode Spacer 31 Thermal Spraying Film for Insulation 32 Thermal Spraying Film for Underlayer 33 Crystalline Glass Frit Paste Coating 34 Burr

Claims (3)

[Claims] 1. An apparatus comprising a line cathode as an electron beam source between a back electrode and a screen and a laminated electrode in which a plurality of electrode plates for controlling deflection and the like of electrons from the line cathode are laminated in a vacuum state. In a method of manufacturing a flat-panel image display device having a flat glass container to be stored, alumina is sprayed on both sides of an electrode insulating washer that also functions as an adhesive and a spacer, and one side is coated with a crystalline glass frit paste by printing. A method for manufacturing a flat-panel image display device, characterized in that it is provided between electrodes when laminating the electrode plates of the laminated electrode. 2. The method of manufacturing a flat image display device according to claim 1, wherein nitrocellulose is used as a resin to be kneaded with the glass frit, and a glass frit paste is used. 3. The method for producing a flat image display device according to claim 1, wherein ethyl cellulose is used as a resin to be kneaded with the glass frit, and a glass frit paste is used.