JPH07142016A - Plane type image display device - Google Patents

Abstract

PURPOSE:To protect a glass vessel from a flaw by sticking a coat material on a side surface of a plane type image display device as well as to prevent the breakdown of the device of reinforcing a structural weak point. CONSTITUTION:A linear negative electrode of an electron beam source and plural electrode plates is arranged between a back plate and a screen. These are layered on each other, and are sealed in a flat glass vessel, and the inside is made in vacuum, and an effective electron beam is pulled out from the linear negative electrode, and it is controlled, nd an image is projected on the screen. A coating material 20 is stuck on the side surface of the glass vessel of this plane type image display device 30. In this constitution, the vessel is reinforced, and the breakdown of the plane type image display device can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat image display device for 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 wider depth than a screen, it is not possible to manufacture a thin television receiver. It was possible. Recently, EL display elements, plasma display devices, liquid crystal display elements, etc. have been developed as flat plate display elements.
All of them are 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 to divide the screen on the screen into a plurality of sections in the vertical direction, deflect the electron beam in the vertical direction for each section to display a plurality of lines, and further divide the section in the horizontal direction into a plurality of sections. Then, the R (red), G (green), and B (blue) phosphors are made to sequentially emit light for each section (hereinafter referred to as image subsections), and the R, G, and B phosphors The television image is displayed as a whole by controlling the irradiation amount of the electron beam by a color video signal.

FIG. 4 is an exploded perspective view showing a part of a conventional flat-panel image display device. In FIG. 4, 1 is a back electrode,
Reference numeral 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 deflection electrode, and 7a and 7b are vertical deflection electrodes. It is housed in the glass container 8 and the back container 9, and the inside of the container is evacuated to form a flat image display device.

The back electrode 1 is made of a flat plate-shaped conductive material and is provided in parallel with the line cathode 2. The line cathodes 2 are horizontally stretched so as to generate an electron flow with a substantially uniform current density distribution in the horizontal direction, and a plurality of line cathodes 2 are vertically arranged at appropriate intervals (only four in this embodiment). Provided).

The extraction electrode 3 is made of a conductive plate 11 and faces the back electrode 1 through the line cathode 2, and a row of through holes 10 provided at appropriate intervals in the horizontal direction is arranged on a horizontal line facing each line cathode. Electrons emitted from the linear cathode 2 are provided in a fixed direction by passing through the through holes 10.
The amount of electron beam is controlled by extracting a certain amount.

A plurality of signal electrodes 4 are vertically elongated conductive plates 12 which are arranged at predetermined positions in a position opposed to each of the through holes 10 in the extraction electrode 3 in the horizontal direction.
In each conductive plate 12, the extraction electrode 3
The same through hole 13 is provided at a position facing the through hole 10 of FIG. The signal electrode 4 controls the passage of the electron beam through the through hole 13 based on the video signal.

The focusing electrode 5 has a through hole 14 at a position facing the through hole 13 of the signal electrode 4 and a conductive plate 15 having a through hole 14.
And controls the size of the electron beam.

The horizontal deflection electrode 6 is a through hole 1 of the focusing electrode 5.
The elongated conductive plates 16a and 16b are vertically arranged on the same plane so as to face the middle of the four rows to form a pair of horizontal deflection electrodes. There is. The electron beam is deflected in the horizontal direction by the conductive plates 16a and 16b.

The vertical deflection electrodes 7a and 7b are composed of two comb-teeth-shaped conductive plates which are meshed with each other on the same plane with an appropriate gap therebetween. The conductive plate 18a and the upper conductive plate 18b form a pair of vertical deflection electrodes.
The electron beam is vertically deflected by a and b.

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

The electrode unit 22 is formed by laminating a plurality of conductive plates from the extraction electrode 3 to the vertical deflection electrode 7.
In this electrode unit 22, the electron beam 17 is irradiated from the linear cathode 2, passes through the through holes 10, 13, and 14 provided in the extraction electrode 3, the signal electrode 4, and the focusing electrode 5, respectively, and the horizontal deflection electrode 6 and The screen 19 is irradiated via the vertical deflection electrode 7.

This plane type image display device has a screen 1
In order to obtain a highly uniform image, the seams of adjacent image subsections 21 on 9 are not visible, and when processing and assembling each electrode, each electrode is processed and positioned with high accuracy. It is made by.

[0015]

However, in the above-mentioned structure, since the inside of the flat glass container is evacuated, internal stress peculiar to the flat image display device of the present invention is generated in the glass container.

That is, the surface on the side surface of the glass container is
Since a tensile force acts like a rubber balloon, if an external impact or even a small amount of external damage occurs in the relevant portion, there is a possibility that implosion failure or crack which is not normally considered may occur.

FIG. 5 shows the stress applied to the glass container. Due to the external atmospheric pressure 31, the flat panel image display device receives a force of deforming into a shape as shown in FIG. Due to this deforming force, compressive stress 32 is generated on the top surface and the back surface of the glass container, and tensile stress 33 is generated on the side surface.

Further, in the process of forming and manufacturing the glass container, the side surface of the glass container 34 becomes relatively weak due to the fact that the side surface becomes thinner than the top surface due to the drawing action and the above-mentioned pulling force. Even if a scratch of about μm is generated on the side surface, there is a possibility that practical strength cannot be ensured, and there is a problem that the flat image display device may be finally broken.

In view of the above problems, the present invention is intended to reinforce the glass container, protect it from external damage, and prevent the flat image display device from being broken by attaching a covering material to the side surface of the glass container. .

[0020]

In order to solve the above problems, a structure in which a coating material having high weather resistance, stable and strong adhesive force is attached to the side surface of the glass container of the flat panel image display device of the present invention. Is to have.

[0021]

According to the flat-type image display device of the present invention, since a tensile stress is applied to the side surface of the glass container and the structure has a weak strength, when a scratch having a depth of 3 μm or more occurs on the side surface of the glass container, There is a risk that the glass container will not be able to secure practical strength and may be damaged by the external pressure. However, by attaching a covering material to the side surface of the glass container, it is possible to prevent damage to the flat panel image display device due to possible external shocks and scratches. It is a thing.

[0022]

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

FIG. 1 is an overall view of a flat-panel image display device to which a covering material according to an embodiment of the present invention is attached.
Reference numeral 29 is a covering material, and 30 is a flat image display device. It is necessary that the material of the covering material 29 has a sufficient protection capability against external damage, and there is a possibility that external damage will occur until the final step of assembling this flat panel image display device into the cabinet. Need to be installed in the cabinet while attached. In view of such a usage environment of the flat panel image display apparatus 30 of the present invention, the covering material has a stable bonding ability and breaking force with respect to the flat panel image display apparatus 30 in a high temperature / low temperature and high humidity environment for a long period of time. Must have. An example in which a polyimide tape, which is one of the adhesive tapes, is used as a covering material that satisfies these conditions will be described.

The covering material 29 of FIG. 1 is a polyimide tape in which a base material of a polyimide film having a thickness of 50 μm and a silicon adhesive material having a thickness of 40 μm are laminated. This polyimide tape has stable characteristics in an environment of -70 ° C to + 260 ° C, is flame retardant, and has excellent chemical resistance and radiation resistance. Further, since the silicon-based adhesive material is viscoelastic, even if the base material is broken by a sharp blade, the silicon-based adhesive material has the characteristic of viscoelasticity, so that the glass container is protected. Further, the tear strength is high, and the reinforcing effect of the side surface portion of the glass container can be obtained.

FIG. 2 shows changes with time of the adhesive strength of the coating material 29 under high temperature and high humidity environment. Figure 2 shows polyimide tape attached to a glass container under 100 ° C environment and
It is a chart showing the change over time in adhesive strength up to 2000 hours when left in an environment of 0 ° C. and 80% Rh, where the horizontal axis shows elapsed time (h) and the vertical axis shows adhesive strength (kgf). .

As is clear from FIG. 2, the adhesive strength of this polyimide tape hardly deteriorates under each environment, and it is recognized that the polyimide tape in this embodiment has excellent performance in terms of heat resistance and humidity resistance. it can. Also,
Other than polyimide tape, Teflon, silicon, glass fiber, polyethylene terephthalate (PET), etc.
As long as it has the same or higher ability as a heat and moisture resistant tape, it can be considered to be applied as a covering material.

Next, FIG. 3 shows the protective ability of this polyimide tape against external force. FIG. 3 is a diagram showing the depth of scratches when a cutter is used to damage a glass container coated with a polyimide tape up to 2 kgf and a glass container which is not covered with a polyimide tape. The load (kgf) and the depth of scratches (μm) are plotted on the vertical axis.

As is apparent from FIG. 3, when not covered with the polyimide tape, scratches of several tens of μm occur, whereas when covered with the polyimide tape, the scratch depth is less than 1 μm. It can be recognized that the coating with the polyimide tape has an excellent effect in terms of protecting the glass container against external damage.

According to this structure, the covering material is attached to the side surface of the glass container of the flat image display device to protect the side surface of the glass container from most of the scratches that may occur during handling of the flat image display device. As well as
It has an effect of reinforcing the structural weakness of the flat panel image display device, and after being installed in a cabinet, a sufficiently stable adhesive strength is secured even in an environment of high temperature and high humidity. It is possible to eliminate the fear of damage due to external impact.

[0030]

According to the present invention, it is possible to prevent the glass container from being scratched by attaching the covering material to the side surface of the flat panel image display device, and at the same time, as the flat panel image display device. It is possible to realize an excellent protective ability to reinforce a weak point in the structure which is unique, and prevent the flat image display device from being broken.

[Brief description of drawings]

FIG. 1 is an overall view of a flat-panel image display device to which a covering material is attached according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram for explaining stability of adhesive strength of a polyimide tape according to an embodiment of the present invention under a high temperature and high humidity environment.

FIG. 3 is a characteristic diagram for explaining the effect of protecting the polyimide tape from external damage in the example of the present invention.

FIG. 4 is an exploded perspective view of essential parts of a conventional flat image display device.

FIG. 5 is a vertical sectional view for explaining internal stress generated in a glass container in a conventional flat image display device.

[Explanation of symbols]

 29 coating material 30 flat image display device

Claims (1)

[Claims] 1. A line cathode as an electron beam source and a plurality of electrode plates are provided between a back electrode and a screen, these are laminated and sealed in a flat glass container, and then the inside is evacuated to obtain the line cathode. A planar image display device for extracting an effective electron beam from the device and controlling the image to display an image on a screen, wherein a coating material is attached to a side surface of the glass container.