JPH0261948A - Image display device - Google Patents

Abstract

PURPOSE:To provide an image of high quality by making the tip of a comb- shaped horizontal deflecting electrode in wide form. CONSTITUTION:An image displaying device is formed by installing an linear cathode, drawout electrode, signaling electrode, converging electrode, horizontal deflecting electrode, and vertical deflecting electrode one after another from the back face vessel side between a front face glass vessel, whose inner surface is coated with fluorescent substance, and a back face vessel. The horizontal deflecting electrode consists of reinforcing sash bars 42(i), 42(ii) meshing one another with an appropriate space between in the horizontal direction to the screen, and comb-shaped conductive plates 41(i), 41(ii) protruding on both sides in the perpendicular direction of the screen from these sash bars 42(i), 42(ii) are meshing with each other through an appropriate space. Wide parts 52(i), 52(ii) are formed at the tips of these comb-shaped electrodes 41(i), 41(ii). This allows deflecting only in the horizontal direction without being influenced by the potential of the sash bars 42(i), 42(ii) to provide an image of high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat 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. It was impossible to do so.

In addition, although EL display panels, plasma display devices, liquid crystal display devices, etc. have recently been developed as flat display devices, all of them are insufficient in terms of performance such as brightness, contrast, and color reproducibility. It has not yet been put into practical use.

Therefore, the present applicant proposed a new display device in Japanese Patent Application No. 62-288762 to achieve a display device on a flat panel using electron beams.

This involves dividing the screen into multiple sections vertically, deflecting the electron beam vertically in each section to display multiple lines, and then dividing the screen into multiple sections horizontally. The R, G, B, etc. phosphors are made to emit light sequentially for each section, and the amount of electron beam irradiation to the R, G, B, etc. phosphors is controlled by the output color video signal, and the total It displays television images.

FIG. 5 shows the internal configuration of a conventional image display device.

1 is a back electrode, 2A to 2C are line cathodes as electron beam sources, 3 is an electron beam extraction electrode, 4 is a signal electrode, 5 is a focusing electrode, 6 is a horizontal deflection electrode, and 7 is a vertical deflection electrode. These components are housed in containers 8 and 9, and the insides of the containers are evacuated.

The line cathodes 2A to 2C are stretched horizontally so as to generate an electron flow with a current density distribution that is approximately similar to the current density distribution in the horizontal direction. In the example 2
Only the three trees of A, 20.2 and C are shown). These wire cathodes are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material.

The back electrode 1 is made of a flat conductive material, and the wire cathodes 2-2
It is parallel to C.

The extraction electrode 3 connects to the back electrode 1 via the line cathodes 2a to 2c.
Through holes 10 are provided at appropriate intervals in the horizontal direction, facing the
It consists of a conductive plate 11 having a row of lines in a horizontal line -1- facing each line cathode. Although the hole 10 is circular in the embodiment, it may be oval, rectangular, or slit-like.

The signal electrode 4 consists of a row of vertically elongated conductive plates 12 arranged at predetermined intervals at positions horizontally opposite to each of the E1 through holes 10 in the extraction electrode 3. is the through hole 10 of the bowed electrode 3
A similar through hole 13 is provided at a position opposite to .

The shape of the J through hole 13 may be an ellipse or a rectangle, or a first hole in the vertical direction.
1. A long slit-shaped one may also be used.

The focusing electrode 5 is composed of a conductive plate 22 having through holes 14 at positions facing each of the through holes 13 of the signal electrode 4 . The shape of the through hole 14 may be a circle, an ellipse, or a slit, and the number of focusing electrodes may be plural.

The horizontal deflection electrode 6 consists of two reinforcing bars 16a and 160 that are engaged with each other with an appropriate space in the horizontal direction with respect to the screen, and furthermore, the two reinforcing bars 16i and 160 that are engaged with each other are
The structure is such that comb-shaped conductive plates 15a and 150 that protrude from 0 on both sides in a direction perpendicular to the screen are interlocked with each other with an appropriate space between them.
are arranged to face each other in the middle of the row of through-holes 14 of the focusing electrode 5, and are configured to form a pair of horizontal deflection electrodes. Therefore, by applying a horizontal deflection voltage to each of the two reinforcing bars 16a and 160, the electron beam 17 emitted from the through hole 14 of the focusing electrode 5 is horizontally moved between the comb-shaped conductive plates 15a and 150. Deflected.

The vertical deflection electrode eye 70 is composed of a conductive plate having a connecting portion 23 at the end, that is, two comb-shaped conductive plates are engaged with each other at an appropriate interval on the 1aJ-plane L, for example. For the electron beam 17, the lower conductive plate 18a and the north conductive plate 180 form a pair of vertical deflection electrodes.

The screen 19 is constructed by coating the inner surface of the glass container 8 with a phosphor 20 that emits light when irradiated with an electron beam, and adding a metal back layer (not shown) to the L of the phosphor 20 .

-1- In the embodiment described above, the sixth
This will be explained in a little more detail using figures. The horizontal deflection electrode 6 is the sixth
As shown in the figure, it consists of two reinforcing bars 16i, 160 that interlock with each other with an appropriate space in the horizontal direction with respect to the screen.
The structure is such that comb-shaped conductive plates 15 and 150 protruding from the screen on both sides in a direction perpendicular to the screen are interlocked with each other with an appropriate space between them.

As shown in FIG. 6, the comb-like conductive plates 15a and 150 are elongated and straight in the vertical direction.

The protruding comb-like conductive plates 15a and 150 are configured as a pair to form a horizontal deflection electrode. For this reason 2
The electron beam 17 is horizontally deflected by applying a horizontal deflection voltage to each of the reinforcing bars 16a and 160.

Problems to be Solved by the Invention FIG. 7 shows an enlarged view of the state in which the electron beam 17 passes through the horizontal deflection electrode 6. In Fig. 7, electron beam 1
When trying to deflect 7 to the right side 1 on paper, the reinforcing bar 16a and the comb-shaped conductive plate 15i are given a potential of ○, and the reinforcing bar 160 and the comb-shaped conductive plate 150 are given a potential of . It turns out. Namely.

A horizontal deflection vector 24 acts on the electron beam 17 due to the electric potential e of the comb-like conductive plate 15a and the electric potential 150. However, at the same time, a vertical deflection vector 25 also acts on the electron beam 17 due to the O potential of the reinforcing bar 16a and the ■ potential of the reinforcing bar 160. Therefore, the composite vector acting on the electron beam 17 is directed to the lower right as shown in 26. As a result, as shown in FIG. 8, the arrival point of the electron beam 17 on the screen 19 is deflected in the vertical direction along with the horizontal deflection, and the rows of spots 27 on the screen that should originally be lined up horizontally are now This results in repetition of slanted lines, making it impossible to obtain good image quality.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an image display device that can realize high-quality images.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention includes:
a front glass container whose inner surface is coated with phosphor;
A rear container facing the J-side glass container, and a space sandwiched between the rear container and the front glass container,
In a configuration including, in order from the rear container side, a wire cathode, an extraction electrode made of one or more conductive plates, a signal electrode, a focusing electrode, a water moth deflection electrode, and a vertical deflection electrode, the comb-shaped horizontal deflection It has a configuration in which the tip of the electrode is wide.

Function The present invention eliminates the electric field effect caused by the reinforcing bars of the horizontal deflection electrode by using the above-described configuration, and only horizontal deflection, which is the original purpose, can be performed, and good image quality can be obtained.

Embodiments Hereinafter, image display devices according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the internal configuration of an image display device according to an embodiment of the present invention. 28 is a back electrode, 48a to 48c are line cathodes as electron beam sources, 29 is an electron beam extraction electrode, and 30
is a signal electrode, 31 is a focusing electrode, 32 is a horizontal deflection electrode, 3
3A to 330 are vertical deflection electrodes, and these components are housed in containers 34 and 35, and the inside of the container is evacuated. The line cathodes 48A to 48C are horizontally stretched so as to generate an electron flow with a current density distribution that is approximately -like in the horizontal direction, and a plurality of line cathodes (in the embodiment, a plurality of line cathodes are arranged vertically at appropriate intervals). Only three (48A and 480.48H are shown) are provided. These wire cathodes are constructed, for example, by coating the surface of a tungsten wire with an oxide cathode material.

The back electrode 28 is made of a flat conductive material, and is provided in parallel to the line cathodes 48A to 48C.

The extraction electrode 29 faces the back electrode 28 via the line cathodes 48A to 48C, and is formed from a conductive plate 37 having a row of through holes 36 provided at appropriate intervals in the horizontal direction on a horizontal line opposite to each line cathode. Become. Although the through hole 36 is circular in this embodiment, it may be oval, rectangular, or slit-like.

The signal electrode 30 consists of a row of vertically elongated conductive plates 38 arranged at predetermined intervals at positions horizontally opposite to each of the through holes 36 in the U4 L electrode 29, and each conductive plate The plate has a similar A through hole 39 at a position opposite to the through hole 36 of the extraction electrode 29. The shape of the through hole 39 may be an ellipse, a rectangle, or a vertically elongated slit.

The focusing electrode 31 is composed of a conductive plate 50 having through holes 4o at positions facing each through hole 39 of the signal electrode 3o.

The shape of the through hole 40 may be a circle, an ellipse, or a slit, and the number of focusing electrodes may be plural.

The horizontal deflection electrode 32 consists of two reinforcing bars 42a and 420 that are engaged with each other with an appropriate space in the horizontal direction with respect to the screen, and furthermore, the two reinforcing bars 42a and 420 that are engaged with each other are interlocked with each other with an appropriate space between them.
The structure is such that comb-shaped conductive plates 41a and 410 that protrude from 0 on both sides in a direction perpendicular to the screen are engaged with each other with an appropriate space between them.
are arranged so as to face each other in the middle of the row of correction holes 40 of the focusing electrode 31, and are configured to form a pair of horizontal deflection electrodes. Therefore, by applying a horizontal deflection voltage to each of the two reinforcement bars 42a and 420, the electron beam 51 emitted from the through hole 40 of the focusing electrode 31 is directed to the comb-shaped conductive plate 42.
It is horizontally deflected between A and 410.

The vertical deflection electrodes 33a and 330 are composed of a conductive plate having a connecting portion 49 at the end, that is, two comb-shaped conductive plates are meshed with each other on the same plane with a distance between them. For example, for the electron beam 51, the lower conductive plate 43a and the upper conductive plate 440 form a pair of vertical deflection electrodes.

The screen 45 is constructed by coating the inner surface of the glass container 34 with a phosphor 46 that is emitted by exposure to an electron beam, and then adding a metal back layer (not shown) to the inner surface of the glass container 34.

In the above embodiment, the horizontal deflection electrode 32 will be explained in detail using FIG. 2. As shown in FIG. 2, the horizontal deflection electrode 32 consists of two reinforcing bars 42 and 420 that are engaged with each other with an appropriate space in the horizontal direction with respect to the screen. A comb-shaped conductive plate 41 protrudes from 42a and 420 on both sides in a direction perpendicular to the screen.
A, 410 are interlocked with each other with an appropriate space between them. Furthermore, the distal ends of the comb-like conductive plates 41a, 410 have wide portions 52a, 520, as shown in FIG.

The operation of the horizontal deflection electrode configured as described above will be explained below using FIG. 3.

First, FIG. 3 shows an enlarged view of the state in which the electron beam 51 passes through the horizontal deflection electrode 32.

In FIG. 3, when trying to deflect the electron beam 51 to the right on the paper, the reinforcing bar 42a and the comb-shaped conductive plate 41
A and its wide part 52A have a potential of ○, and the reinforcing bar 420
A potential of ■ is applied to the comb-shaped conductive plate 410 and its wide portion 520. That is, a horizontal deflection vector 53 acts on the electron beam 51 due to the potential of the comb-shaped conductive plate 41a and the potential of the comb-shaped conductive plate 410. At the same time, due to the O potential of the reinforcing bar 42a and the ■ potential of the reinforcing bar 420, a deflection vector also acts perpendicularly to the electron beam 51, but the reinforcing bar 42
The e potential of the wide portion 520 cancels out the potential of the wide portion 520, and the O potential of the wide portion 52 a cancels out the potential of the reinforcing bar 420, and in the end, the electron beam 51 has only the horizontal deflection vector 53. work.

As a result, as shown in Figure 4, the arrival point of the electron beam 51 on the screen 45 is only due to horizontal deflection, and the rows of spots 54 on the screen are aligned in a horizontal line, making it possible to obtain good image quality. .

As described above, according to this embodiment, the wide portions 52, 5 are provided at the tips of the comb-like conductive plates 41, 410 of the horizontal deflection electrode 32.
20, it becomes possible to deflect only in the horizontal direction without being affected by the potential of the reinforcing bars 42a and 420, and it is possible to obtain images of good quality.

Effects of the Invention As described above, in the present invention, by making the tip of the comb-like horizontal deflection electrode wide, it is possible to perform reliable horizontal deflection without being affected by the potential of the reinforcing bar. This allows you to obtain images of good quality.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the configuration of an image display device according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a horizontal deflection electrode, and FIG. 3 is a state in which an electron beam passes through the horizontal deflection electrode. , FIG. 4 is a diagram showing the behavior of an electron beam on a screen, FIG. 5 is an exploded perspective view showing the configuration of a conventional image display device, and FIG. 6 is a diagram showing a conventional horizontal deflection device. An enlarged plan view of the electrode, FIG. 7 is a plan view for explaining the state when an electron beam passes through the horizontal deflection electrode in the image display device, and FIG. 8 is a plan view showing the behavior of the electron beam on the screen hill. FIG. 32...Horizontal deflection electrode, 41a, 410...
... comb-shaped conductive plate, 42i, 420... reinforcing bar, 52i, 520... wide part. Name of agent: Patent attorney Shigetaka Awano and 1 other person 41
A, 4I B - ° - Radial tooth 1 person conductivity 15? I, 520--Issho fi-Nento Zp Figure Figure Figure

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, and a wire cathode or a plurality of wire cathodes in order from the back container side in the space sandwiched by the back container and the front glass container. In a flat image display device equipped with an extraction electrode, a signal electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode each made of a conductive plate, the tip of the horizontal deflection electrode formed in a comb-teeth shape is widened. An image display device characterized by: