JPH02242552A - image display device - Google Patents

Abstract

PURPOSE:To increase the size of effective screen area by attaching a cathode terminal made airtight with hermetic seal to the inside of a back metal. CONSTITUTION:Cathode terminals 2a are attached to opposing two sides of a back metal 1 so as to penetrate the back metal 1 and the tips of the terminals 2a are connected to wire cathodes directly or by means of lead wires. Signal electrode terminals 3 are attached to the other opposing two sides of the back metal 1 and connected to a drive circuit. A base 2b for supporting the cathode terminal 2a is made of glass and made integral with the cathode terminal 2a using hermetic seal 2c to prevent vacuum leak. Disposing the cathode terminal 2a on the inner side of the back metal 1 in the direction perpendicular to the back metal 1 in this way, the external dimension in the lateral direction is reduced and as a result the overall effective screen area is increased.

Description

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

BACKGROUND OF THE INVENTION First, a conventional image display device will be described with reference to FIG. In FIG. 4, 6 is a back electrode, 72 is a line cathode as an electron beam source, 8 is an electron beam extraction electrode, 9 is a signal electrode, 1O is a first focusing electrode, 11 is a second
Focusing electrodes, 12i and 120 are horizontal deflection electrodes, 13i and 1
30 is a vertical deflection electrode, and these components are housed in a glass container 14 and a hack metal 1 made of 42-6 alloy, and the insides of the containers 1 and 14 are kept in a vacuum.

The line cathode fins ~72 are stretched in the horizontal direction so as to generate an electron flow with a current density distribution that is approximately -like in the horizontal direction. ,
(Only 4 trees of 770, 7 ha, and 72 are shown) are provided. These wire cathode fins 72 are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material.

The back electrode 6 is made of a flat conductive material, and is connected to the wire cathode fins 7 to 7.
The two are parallel to each other. The extraction electrode 8 is made of a conductive plate that faces the back electrode 6 via the line cathode fins 72 and has a row of through holes 15 provided at appropriate intervals in the horizontal direction on a horizontal line facing each line cathode. Although the through hole 15 is circular in the wooden embodiment, it may be elliptical or rectangular, or it may be slit-like as in the extraction electrode of the conventional embodiment described above. The signal electrode 9 consists of a row of vertically elongated conductive plates 17 arranged at predetermined intervals at positions horizontally opposite to each of the through holes 15 in the extraction electrode 8. is located at a position opposite to the through hole 15 of the extraction electrode 8,
It has a similar through hole 16.

The shape of the through hole 16 may be an ellipse or a rectangle, or it may be like a vertically elongated slit like the signal electrode in the conventional embodiment described above. The first focusing electrode 10 is
It consists of a conductive plate having through holes 18 at positions facing each through hole 16 of the signal electrode 9.

The shape of the through hole 18 may be circular, elliptical, or slit-like. The second focusing electrode 11 has a slit hole 19 connected vertically at a position opposite to the through hole 18 of the first focusing electrode 10.
have. The shape of the slit hole 19 may be a round hole or an elliptical rectangle like the through hole 18 of the first focusing electrode 10. The horizontal deflection electrodes 12I, 120 are composed of two conductive plates 2I22 connected by comb-like end portions that are interlocked with each other with an appropriate space between them on the same plane. The space 20 created therein faces the through-slint hole 19 of the second focusing electrode 11 . The vertical deflection electrodes 13a and 130 have a configuration in which conductive plates connected at their ends as shown in 23.24, that is, two comb-shaped conductive plates are meshed with each other on the same plane with an appropriate interval between them. For example, for an electron beam 25, a lower conductive plate 23 and an upper conductive plate 24 form a pair of vertical deflection electrodes. The screen 26 includes a glass container 14 containing a phosphor 27 that emits light when irradiated with an electron beam.
on the inner surface of the metal bank layer (not shown).
is added and configured.

The operation of the image display device configured as described above will be explained.

First, a voltage (1) is applied to the back electrode 6, and a voltage (2) higher than (1) is applied to the extraction electrode 8. Furthermore, V<
V. 〈■2 appropriate voltage V.

When applied to the wire cathode ray, the electric field on the surface of the wire cathode becomes positive, and a stream of electrons is emitted and accelerated toward the extraction electrode 8. Also, for example ■. >V2 voltage ■. When applied to the line cathode ray, the electric field on the line cathode surface becomes negative and electron emission can be suppressed. Therefore, by individually controlling the voltage of the line cathodes, 7
0, 7 C, etc. are repeated to emit an electron beam for a certain period of time, and a sorted electron beam with a uniform current density distribution in the horizontal direction is generated for each line cathode. be able to. The above-mentioned sheet-like electron beam is then horizontally divided into a plurality of parts by the through-hole 15 of the extraction electrode 8, and reaches the through-hole 16 of the signal electrode 9 as a further large number of electron beam rows. Then, the voltage (3) of the signal electrode 9 is set to V3>V.

If V3<Vo, the electron beam loses kinetic energy and cannot pass through. Therefore, by controlling ■3 over time, the image for displaying the picture element The amount of electron beam passing is adjusted individually for each electron beam according to the signal.

The electron beam that has passed through the signal electrode 9 then passes through the first focusing electrode 1
0. After reaching the second focusing electrode 11 and being focused and shaped by the electrostatic lens effect of the through hole 18 and slit hole 19, it is focused between adjacent conductive plates of the horizontal deflection electrodes 12a and 120 and between the vertical deflection electrodes 13a. , 130 phase adjacent conductive plates 23.2
It is electrostatically deflected horizontally and vertically by a potential difference (called a deflection voltage) applied between 4 and 4. Further screen 2
A high voltage (for example, 10 KV) is applied to the metal back layer 6, and the electron beam is accelerated to high energy and collides with the Meklhack, causing the phosphor to emit light.

When a television screen is divided vertically and horizontally into a matrix to form a collection of subdivisions 28, the electron beams separated as described above are made to correspond to each subdivision, and the electron beams are divided into each subdivision. By deflecting and scanning only within minutes, the entire image can be displayed on the screen. Further, by controlling the RGB video signals corresponding to each picture element over time using the signal electrode voltages as described above, a television moving image can be reproduced.

Problems to be Solved by the Invention However, in the above configuration, as shown in FIG. 3, the carthode terminal 5 of the bank metal 1 is attached in the horizontal direction, so the external dimensions of that part become larger.
This has the problem that the effective screen becomes smaller.

In view of the above-mentioned problems, the present invention provides an image display device that can enlarge the effective screen.

Means for Solving the Problems In order to solve the above-mentioned problems, the image display device of the present invention is provided by penetrating a cathode terminal back metal, which is an airtight terminal formed by a hermetic seal inside a bank metal.

Operation According to the present invention, with the above-described configuration, the terminals protruding from the side surface of the bank metal pass through the bank metal, thereby making the width narrower and increasing the effective screen of the panel.

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

FIG. 1 shows the inside of a bank metal of an image display device according to an embodiment of the present invention.

In FIG. 1, 1 is a back metal. A cathode terminal 2a is attached to two opposite sides of the back metal 1 so as to pass through the hack metal 1, and a wire cathode shown in FIG. 4 is connected to the tip thereof either directly or by a lead wire. Reference numeral 3 denotes signal electrode terminals, which are attached to the other two opposing sides of the hack metal 1 and connected to a drive circuit (not shown).

FIG. 2 is a sectional view showing the structure of the cathode terminal used here. In FIG. 2, 2b is a pedestal that supports the cathode terminal 2a and is made of glass, and a hermetic seal 2c integrates the cathode terminal 2a to prevent vacuum work.

A glass frit 4 is used to bond the hack metal 1 to the cathode terminal pedestal 2b to which the cathode terminal 2a is attached.

According to this configuration, by providing the cathode terminal 2a inside the hack metal 1 in a direction perpendicular to the hack metal 1, the external dimensions in the lateral direction can be reduced and the overall effective screen can be increased.

In the above embodiment, only the cathode terminal 2a is used, but the signal electrode terminal 3 may also have a cathode structure similar to the cathode terminal 2a.

Furthermore, although the pedestal 2b of the cathode terminal 2a is made of glass, it may be made of various types of ceramics.

Furthermore, here, the cathode terminals 2a are arranged in one row parallel to the sides, but when there are many terminals, they are arranged in rows on two sides, and the arrangement is also parallel to the sides in a zigzag pattern, making effective use of the plane. shall also be good.

Effects of the Invention As described above, according to the present invention, by attaching the cathode terminal, which is an airtight terminal with a hermetic seal, to the inside of the back metal, vacuum work can be prevented, the external dimensions of the back metal are reduced, and the effective screen is enlarged. can do.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a hack metal of an image display device according to an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of the cathode terminal used therein, and Fig. 3 is a hack metal perspective view of a conventional image display device. FIG. 4 is an exploded perspective view showing the basic structure of the image display device. 1... Back metal, 2a... Cathode terminal, 2b... Cathode terminal pedestal, 2c...
... Hermetic seal, 3 ... Signal electrode terminal, 4 ... Glass frit. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (1)

[Claims] It includes a flat screen coated with phosphor and a back electrode made of a conductive plate facing the screen, and a line cathode, a beam It is equipped with an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode, and also includes a front glass container and a back metal that house these screens, line cathodes, and various electrodes in a vacuum state, and the back metal is attached to the inner surface. An image display device in which a cathode terminal consisting of airtight terminals with numerous hermetic seals is provided by penetrating the back metal.