JPH08115688A - Image display element - Google Patents

Abstract

PURPOSE: To provide an image display element in which deflection distortion caused by the enlargement of the slit width of a horizontal deflection electrode is reduced. CONSTITUTION: This image display element has a screen 9 to which a phosphor is applied, a plurality of linear cathodes 2, horizontal and vertical deflection electrodes, 57, 8, respectively, a beam flow controlling electrode 4, and focusing electrodes 5, 56. The horizontal deflection electrode 57 comprises a plurality of conducting plates 56 vertically aligned along opposite positions between the through holes of the vertical focusing electrode 5, and every two conducting plates are electrically connected together and voltages for horizontal deflection are applied to the plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generates an electron beam for each section when a screen on a screen is divided into a plurality of sections in the vertical direction, and emits each electron beam in the vertical direction for each section. The present invention relates to an image display device that deflects and displays a plurality of lines to display an image as a whole.

[0002]

2. Description of the Related Art The basic structure of a conventional image display device will be described with reference to FIG.

This display element has a back electrode 1, a line cathode 2 as a beam source, a beam extraction electrode 3, a beam flow control electrode 4, a vertical focusing electrode 5, a horizontal focusing electrode 6, and a horizontal deflection in this order from the rear to the anode side. An electrode 7, a vertical deflection electrode 8, and a screen plate 9 are arranged and configured, and these are housed inside a vacuum container.

A line cathode 2 as a beam source is stretched in the horizontal direction so as to generate an electron beam which is linearly distributed in the horizontal direction. (Only 7 of 2 a to 2 are shown)
It is provided. In this configuration, the line cathode spacing is 4.4 mm,
Assuming that 19 pieces are provided, the number of the line cathodes is 2 to 2 pieces. The structure of these line cathodes 2 is 10
An oxide cathode material is applied to the surface of a tungsten rod having a diameter of ˜30 μm. As will be described later, the above-mentioned line cathode is controlled so as to sequentially emit an electron beam from the upper line cathode 2a to the lower two line cathodes at regular intervals. The back electrode 1 not only prevents the generation of electron beams from the other line cathodes but also pushes out the electron beams only in the direction of the anode.

Although a vacuum container is not shown in FIG. 3, it is possible to use the back electrode 1 to form a structure integrated with the vacuum container. The beam extraction electrode 3 is a linear cathode 2a-2.
A conductive plate 11 having a plurality of through holes 10 arranged in a row at regular intervals in a horizontal direction facing each other.
The electron beam emitted from the line cathode 2 is taken out through the through hole 10. Next, the beam flow control electrode 4 is composed of a vertically long conductive plate 13 having a through hole 12 at a position facing each of the line cathodes 2A to 2C, and a plurality of beam flow control electrodes 4 are horizontally arranged at predetermined intervals. It is installed side by side. In this structure, 114 beam flow control electrode conductive plates 13a to 13n are provided (only eight are shown in FIG. 3).

The beam flow control electrode 4 controls the passing amount of each electron beam horizontally divided by the beam extraction electrode 3 in accordance with the picture element of the video signal and in synchronization with the horizontal deflection timing. are doing.

The vertical focusing electrode 5 is a conductive plate 15 having a horizontally long through hole 14 at a position facing each through hole 12 provided in the beam flow control electrode 4, and focuses the electron beam in the vertical direction. There is.

The horizontal focusing electrode 6 has a through hole 16 which is long in the vertical direction at a position facing the through hole 14 and is a conductive plate 1.
At 7, it acts as a diverging lens to diverge the electron beam horizontally.

The horizontal deflection electrode 7 is composed of a plurality of conductive plates 18 and 18 'vertically arranged along both sides of the through hole 16 in the horizontal direction. The deflection voltage is applied. The electron beam for each picture element is deflected in the horizontal direction, and the R, G, and B phosphors are sequentially irradiated on the screen 9 to emit light. In this configuration, each electron beam is deflected by 2 trio.

The vertical deflection electrode 8 is composed of a plurality of conductive plates 19 and 19 'arranged in the horizontal direction at intermediate positions in the vertical direction of the through hole 16, and a vertical deflection voltage is applied to the vertical deflection electrode 8. The electron beam is deflected vertically.
In this configuration, the electron beam generated from one line cathode is vertically deflected by 12 lines by the pair of electrodes 19 and 19 '. And a vertical deflection electrode 8 composed of 20 pieces
Form 19 pairs of vertical deflection conductors corresponding to 19 line cathodes, respectively, and draw 228 horizontal scanning lines in the vertical direction on the screen 9.

As described above, in this structure, a plurality of horizontal deflection electrodes 7 and vertical deflection electrodes 8 are arranged in a comb shape. Further, by setting the distance to the screen 9 longer than the distance between the horizontal and vertical deflection electrodes, it becomes possible to irradiate the screen 9 with an electron beam with a small deflection amount. As a result, horizontal and vertical co-deflection distortion can be reduced.

As shown in FIG. 3, the screen 9 is formed by coating the back surface of the glass plate 21 with the phosphor 20 in a stripe shape. Although not shown, metal back and carbon are also applied. The fluorescent body 20 deflects the electron beam passing through one through hole 12 of the beam flow control electrode 4 in the horizontal direction to form two fluorescent body pairs of three colors of R, G and B.
It is provided to irradiate the amount of trio, and is applied in stripes in the vertical direction. In FIG. 3, the broken lines on the screen 9 indicate vertical divisions corresponding to the plurality of line cathodes 2, and the two-dot chain line corresponds to each of the plurality of beam flow control electrodes 4. Indicates the horizontal division displayed. FIG. 4 shows an enlarged view of one section divided by a broken line and a two-dot chain line.

As shown in FIG. 4, two trio R, G, and B phosphors in the horizontal direction have a width of 12 lines in the vertical direction. The size of one section is 1 in the horizontal direction in this example.
mm, vertical direction 4.4 mm. Although the phosphors of three colors R, G, and B are shown in stripes in FIG. 4, they may be arranged in a delta shape. However, when they are arranged in a delta shape, it is necessary to apply horizontal deflection and vertical deflection waveforms suitable for them. Also, in FIG. 4, for the sake of explanation, the vertical and horizontal dimensional ratios are different from the image actually displayed on the screen.
Further, in this configuration, one through hole 1 of the beam flow control electrode 4 is provided.
Two trio of R, G, and B phosphors are provided for 2, but one trio or three or more trios may be used. However, the R, G, and B video signals of 1 trio or 3 trios or more are sequentially applied to the beam flow control electrode 4, and horizontal deflection must be performed in synchronization therewith.

[0014]

However, in the above-mentioned conventional structure, the deflection electrode composed of the pair of conductive plates tends to have a large deflection strain as the width of the slit formed by the pair of conductive plates becomes smaller. Therefore, it is desirable to design the slit width as large as possible. But,
In the above image display device, the horizontal deflection electrode 7 is composed of a pair of conductive plates 18 and 18 'vertically arranged along both sides of the through hole 16 in the horizontal direction. Conductor plates 18 and 1 within a horizontal distance of 1 mm
Since it is necessary to arrange a set of 8 ', the width of the slit formed by the conductive plates 18 and 18' cannot be made sufficiently large. As a result, the deflection distortion during horizontal deflection becomes large, and the uniformity of the screen is greatly impaired.

The present invention solves the above-mentioned conventional problems, and provides an image display device in which the slit width of the horizontal electrode can be designed to be sufficiently large and the image quality uniformity is not impaired.

[0016]

To achieve this object, an image display device of the present invention comprises a back electrode, a plurality of line cathodes as a beam source, a beam extraction electrode, and a back electrode in this order from the rear to the anode side. A beam flow control electrode, a vertical focusing electrode, a horizontal landing correction electrode (also serving as a horizontal focusing electrode), a horizontal deflection electrode, and a vertical deflection electrode. The horizontal deflection electrode is provided between the through hole and the through hole of the vertical focusing electrode. It is composed of a plurality of conductive plates vertically arranged along the facing positions, and each conductive plate is electrically connected to every other conductive plate.

A horizontal landing correction electrode having the same structure as the horizontal deflection electrode is provided instead of the horizontal focusing electrode in the conventional example. That is, the horizontal landing correction electrode is composed of a plurality of conductive plates vertically arranged along both horizontal sides of the through hole of the vertical focusing electrode.

[0018]

With this configuration, since the horizontal deflection electrode is composed of the conductive plates arranged in the vertical direction along the positions facing each other between the through holes of the vertical focusing electrode, the number of the conductive plates is reduced. Since the width of the slit formed by the conductive plate can be made sufficiently large, which is half of that in the conventional example, the deflection distortion at the time of horizontal deflection is reduced, and an image display element having excellent image quality uniformity can be obtained.

Further, the image display of the present invention requires a horizontal landing correction electrode, which corrects an assembly error occurring at the time of manufacturing the image display element, and the correction amount is sufficiently smaller than the horizontal deflection amount. Therefore, the deflection distortion here can be ignored. Further, since the horizontal landing correction electrode also serves as the horizontal focusing electrode, the number of electrodes does not increase.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an image display device according to an embodiment of the present invention. 1 is a back electrode, 2a to 2 are a plurality of line cathodes as a beam source, 3 is a beam extraction electrode, 4 is a beam flow control electrode, 5 is a vertical focusing electrode, 5
6 is a horizontal landing correction electrode, 57 is a horizontal deflection electrode,
8 is a vertical deflection electrode, 9 is a screen plate, and the horizontal landing correction electrode 56 is the horizontal deflection electrode 7 in the conventional example.
It has the same shape as.

FIG. 2 (a) is a detailed view of the horizontal deflection electrode 57 in this embodiment, FIG. 2 (b) is a horizontal deflection voltage waveform, and FIG. 2 (c) is the beam spot on the screen. The position. 5A is a detailed view of the horizontal deflection electrode 7 in the conventional example, FIG. 5B is a horizontal deflection voltage waveform, and FIG. 5C is a beam spot position on the screen. In the conventional example, as shown in FIG. 5A, the electrode plate 18 is on the right side and the electrode plate 1 is on the left side of the passing position of each beam.
Since 8'is located, the slit width through which the electron beam should pass is limited by the electrode plate 18, the width of the electrode plate 18 ', and the distance for ensuring electrical insulation between the electrode plates,
It cannot be made wide enough (up to 0.4m in the conventional example)
m).

On the other hand, in this embodiment, as shown in FIG. 2A, only one electrode plate 68 or electrode plate 68 'is positioned between the passage positions of the electron beams, and the slit width is maximum. Can be expanded up to 0.8 mm.

When driving the image display device of this embodiment,
Note the following points. When the horizontal deflection voltage shown in FIG. 5 (b) is applied to the image display element in the conventional example, the spot position on the screen is such that all the beams sequentially move from left to right as shown in FIG. 5 (c). However, in the image display device of this embodiment, when the same horizontal deflection voltage as shown in FIG. 2B is applied, the beam spot position on the screen is
As shown in FIG. 2 (c), those moving from left to right and those moving from right to left are arranged alternately. Therefore, the video signal applied to the beam flow control electrode must be controlled so as to correspond to the movement of the beam spot.

[0025]

As described above, according to the image display device of the present invention, since the width of the slit formed by the conductive plate of the horizontal deflection electrode can be made sufficiently large, the deflection distortion at the time of horizontal deflection is reduced, and the image quality is improved. An image display device having excellent uniformity can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an image display device according to an embodiment of the present invention.

2A is a detailed view of a horizontal deflection electrode of the image display element of the present invention, FIG. 2B is a horizontal deflection voltage waveform, and FIG. 2C is an explanatory diagram of a beam spot in the present invention.

FIG. 3 is an exploded perspective view of an image display element in a conventional example.

FIG. 4 is an enlarged view of a phosphor screen of an image display device in a conventional example.

5A is a detailed view of a horizontal deflection electrode of an image display element of a conventional example, FIG. 5B is a horizontal deflection voltage waveform, and FIG. 5C is an explanatory diagram of a beam spot in the conventional example.

[Explanation of symbols]

 56 horizontal landing correction electrode 57 horizontal deflection electrode 68 electrode plate

Claims (2)

[Claims] 1. A screen coated with a phosphor that emits light when irradiated with an electron beam, and an electron beam source that generates an electron beam for each of a plurality of vertical sections of the screen on the screen. And a separation means for irradiating the screen by dividing the electron beam generated by the line cathode in the horizontal direction, and between the electron beam reaching the screen in the vertical and horizontal directions. A horizontal deflection electrode and a vertical deflection electrode for deflecting in a plurality of stages, and a beam control electrode for controlling the amount of irradiation of the screen with electron beams separated for each of the horizontal sections,
In each image element, the horizontal deflection electrode is provided with a horizontal focusing electrode and a vertical focusing electrode for controlling the emission size on the phosphor surface by an electron beam, wherein the horizontal deflection electrode penetrates the vertical focusing electrode. It is composed of a plurality of conductive plates arranged in the vertical direction along a position facing each other between the holes and the through holes, and each conductive plate is electrically connected to every other conductive plate. Image display device. 2. A screen coated with a phosphor that emits light when irradiated with an electron beam, and an electron beam source that generates an electron beam for each of a plurality of vertical sections of the screen on the screen. And a separating means for irradiating the screen by dividing the electron beam generated by the line cathode in the horizontal direction, and between the electron beam reaching the screen, the vertical direction and the horizontal direction. A horizontal deflection electrode and a vertical deflection electrode for deflecting in a plurality of stages, a beam control electrode for controlling the amount of irradiation of the screen with an electron beam separated for each of the horizontal sections, and an electron beam on the light emitter surface for each pixel. In the image display device, which is provided with a horizontal focusing electrode and a vertical focusing electrode for controlling the light emission size in An image display device characterized in that it is replaced with a horizontal landing correction electrode composed of a plurality of conductive plates vertically arranged along both horizontal sides of the through hole of the vertical focusing electrode.