KR20030063910A - A Screen Display Device - Google Patents

Abstract

PURPOSE: An image display device is provided to prevent picture quality deterioration by preventing distortion of an electron beam and to prevent waste of materials, processes, and manpower by removing a shield electrode. CONSTITUTION: An image display device includes a linear negative electrode, a drawn electrode, a control electrode, a focusing electrode, a horizontal deflection electrode, and a vertical deflection electrode inside a vacuum container. An electron beam passing through one through-hole among many through-holes formed at the lead electrode takes charge of a partial area of a whole screen by the horizontal deflection electrode and the vertical deflection electrode. Stem pieces(73) are alternately formed at positive and negative column pieces. A plurality of unit cells(71) formed of electrode pieces(74) for a horizontal deflection passage of the electron beam are formed at each stem piece. Each unit cell includes a horizontal deflection electrode(70) so that electric field distribution generated by the electrode pieces is symmetrical at least at a deflection area of the electron beam.

Description

Image Display Device {A Screen Display Device}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display element such as a color television. Specifically, in a 14 "type thin image display apparatus, the electric field distribution of the horizontal deflection electrode unit cell is configured such that left and right symmetry is performed in the deflection region of the electron beam, thereby degrading image quality. The present invention relates to an image display device for blocking and eliminating shield electrodes, which had to be separately provided in the related art, to improve quality and reduce production costs.

Conventionally, a CRT is mainly used as a color television image display element, and a CRT has a considerably longer depth than a screen, making it impossible to produce a thin television receiver.

Therefore, EL display elements, plasma display elements, and the like have been developed as flat panel display elements, all of which are insufficient in terms of performance such as brightness, contrast, and color reproducibility.

Japanese Patent Laid-Open Nos. Hei 3-184247 and Hei 3--205751 display a screen on a screen in order to display a high quality image comparable to a CRT on a flat panel device using an electron beam. The image display apparatus which divides into image divisions, deflects an electron beam for each division, emits fluorescent substance, and comprises a color television image as a whole is proposed.

Hereinafter, an example of the above-described prior art image display apparatus will be described with reference to FIG. 1 showing the structure of a general image display apparatus.

As shown in FIG. 1, the image display apparatus of the prior art embodiment includes a back electrode 2, a linear cathode 3 as an electron beam source, an electron beam extraction electrode 4, a control electrode 5, and a focusing electrode 6 The horizontal deflection electrode 7 and the vertical deflection electrode 8 and these components are housed in the front and rear containers 1 and 9 which are glass containers, and the inside of the container is vacuumed.

The front cathode 3 is provided in the horizontal direction so as to generate an electron beam uniformly distributed in the horizontal direction, and is provided with a plurality of keys (only 4 are shown in the figure) in the vertical direction while maintaining a predetermined interval.

These linear cathodes 3 are formed by coating an oxide cathode material on the surface of a tungsten wire, for example.

The back electrode 2 is made of a flat conductive material and is provided in parallel to the linear cathode.

The lead-out electrode 4 is positioned in the screen direction above the line cathode 3 and faces a row of through-holes facing the back electrode 2 and provided at predetermined intervals in the horizontal direction, on a horizontal line facing the line cathode 3. The branch is made of a conductive plate.

The control electrodes 5 are arranged in rows of thin and long conductive plates in a vertical direction with a predetermined spacing at positions facing each other at each of the through holes in the lead-out electrode 4, and are drawn out in each conductive plate. The through holes of the electrode 4 have through holes of the same shape at positions opposite to each other.

The focusing electrode 6 is a conductive plate having a through hole at a position opposite to each through hole of the control electrode 5.

The horizontal deflection electrode 7 is constituted by a conductive plate connected to two blade-shaped ends which are interlocked with each other at predetermined intervals on the same plane.

The vertical deflection electrode 8 is in a state in which the blazing conductive plates of two conductive plates connected at the ends thereof are engaged with each other at predetermined intervals on the same plane.

The screen is constructed by applying a phosphor that emits light by irradiation of an electron beam to the inner surface of the glass container 9 and a metal back layer is added thereon.

In addition, the lead electrode 4, the control electrode 5, the focusing electrode 6, the horizontal biasing electrode 7, and the vertical deflection electrode 8 are bonded to each other with an insulating adhesive. Reference numeral 10 denotes a division area.

It looks at the operating state of the prior art having the above configuration.

First, the heater cathode is heated by flowing a heater current to facilitate electron emission. In a heated state, an appropriate voltage is applied to the back electrode 2, the line cathode 3, and the lead-out electrode 4 to emit an electron beam on the sheet from the surface of the line cathode 3.

The electron beam on the sheet is divided into a plurality of through holes of the lead-out electrode 4 to form a plurality of electron beams 11 (only one electron beam is shown in FIG. 1).

This electron beam flow 11 is controlled by the control electrode 5 in correspondence with the image signal applied to the control electrode 5, and the amount of passage is individually adjusted.

Next, the electron beam passing through the control electrode 5 is focused and shaped by the electrostatic lens effect of the through hole of the focusing electrode 6, and then the conductive plates adjacent to each other of the horizontal deflection electrode and the conductive plates adjacent to each other of the vertical deflection electrode. They are deflected horizontally and vertically by the potential difference applied to them.

In addition, a high voltage (for example, 10 mA) is applied to the metal back layer of the screen, and the electron beam is accelerated to high energy to impinge on the metal back and emit phosphors.

When a television screen is divided into a matrix and a collection of subdivisions, each subdivision is made to correspond to the separated electron beam as described above for each subdivision, thereby deflecting and scanning the electron beam only within each subdivision. By doing so, it is possible to project the entire screen on the screen. In addition, it is possible to reproduce a television moving picture by controlling the R, G, and B video signals corresponding to each image by the control electrode 5.

FIG. 2 is a configuration diagram of the conventional horizontal deflection electrode 7 of the thin image display device 14 " type, and FIG. 3 shows an detail of one unit cell 7a in FIG.

As shown in Figs. 2 and 3, the prior art horizontal deflection electrode 7 of the 14 "image display device is provided on both sides of the positive and negative pole plates 7b and the pillar plates 7b. Each stem plate 7c is formed alternately with each other, and each stem plate 7c is formed with an electrode piece 7d for forming a unit cell 7a which is a passage of the electron beam 11. The horizontal deflection electrode 7 applies different potentials to the (+) and (-) electrode pieces 7d to deflect the electron beam 11 by the potential difference.

As such, when different potentials are applied to the (+) and (-) electrodes to horizontally deflect the electron beam, the electric field distribution e as shown in FIG. 3 is formed by the potential difference.

However, the length B of the (+) and (-) electrode pieces 7d is formed in the vertical space width A between the (+) and (-) stem pieces 7c (B <A), Distortion occurs in the electric field distribution e by forming left and right asymmetrical electrodes 7d.

Therefore, the degree of horizontal deflection is lowered and the shape of the electron beam is asymmetrically distorted, thereby degrading image quality.

Therefore, in order to compensate for this, there is a problem in that unnecessary costs and processes are additionally generated by adding a shield electrode between the horizontal deflection electrode and the vertical deflection electrode.

The present invention has been made to solve the above problems,

An object of the present invention is to provide a 14 " type thin image display device in which the horizontal deflection electrode unit cell is configured so that the left and right asymmetry of the electric field distribution is prevented in the electron beam deflection region.

It prevents distortion of the electron beam and prevents deterioration of image quality to improve quality.

In addition, it is to provide an image display device to reduce the production cost by reducing the number of raw materials and the process by the need for the shield electrode that had to be added in the prior art.

1 is an exploded view showing the configuration of a typical color flat panel display device.

2 is a partially omitted configuration of the horizontal deflection electrode of the prior art.

3 is a partial excerpt detail of FIG. 2.

Figure 4 is a partial excerpt detail of one embodiment according to the present invention.

5 is a state diagram of the operation of FIG.

* Explanation of symbols for the main parts of the drawings

1: back container 2: back electrode

3: line cathode 4: lead-out electrode

5: control electrode 6: focusing electrode

7: horizontal deflection electrode 8: vertical deflection electrode

9: front container 10: division area

11: electron beam flow 70: horizontal deflection electrode of the present invention

71: unit cell 73 of the present invention: stem plate

74: electrode piece 75: concave end

76: recessed part

An image display apparatus according to the present invention for achieving the above object,

The horizontal and vertical deflection electrodes are electron beams that pass through one of the many through holes formed in the extraction electrode with the linear cathode, the extraction electrode, the control electrode, the focusing electrode, the horizontal and vertical deflection electrodes, which generate electrons in the vacuum vessel. In the image display device which is responsible for classifying a portion of the entire screen increment by

Each stem plate is formed alternately on each side of the (+), (-) pillar plate and its pillar plate and each stem plate is provided with a plurality of unit cells formed as electrode pieces for the horizontal deflection passage of the electron beam,

The unit cell is characterized in that the electric field distribution generated by the electrode plate comprises a horizontal deflection electrode configured to be symmetrical at least in the deflection region of the electron beam.

The unit cell according to an embodiment of the present invention,

The length of the electrode piece is configured to be longer than the vertical width between the adjacent stem plate,

A concave end for internal value of the electrode plate,

The electric field generated by the electrode plate is provided with a recess in the upward direction in order to provide an electric field space for symmetry at least in the deflection region of the electron beam,

The length of the vertical direction of the electric field space is characterized in that formed longer than the length of the electrode plate.

Hereinafter, an embodiment of an image display device of the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 4 is a detailed view showing one unit cell 71 from the horizontal deflection electrode 70 of the image display apparatus according to an embodiment of the present invention. FIG. 5 is a view illustrating an operating state by the configuration of FIG. will be.

As shown in FIG. 4, the image display apparatus according to the present invention has a plurality of through-holes formed in the lead-out electrode having a linear cathode, a lead-out electrode, a control electrode, a focusing electrode, horizontal and vertical deflection electrodes, which generate electrons in a vacuum vessel. An image display apparatus in which an electron beam having passed through one of the holes is used to distinguish a partial area of the entire screen by the horizontal and vertical deflection electrodes.

The stem plates 73 are alternately formed on the positive and negative pole plates and the pillar plates on both sides of the horizontal deflection electrode 70 of the present invention, and the electron beams 11 are formed on the respective stem plates 73. It is provided with a plurality of unit cells 71 formed of electrode pieces 74 for the horizontal deflection passage of,

The unit cell 71 is configured such that the distribution of the electric field e generated by the electrode plate 74 is at least symmetrical in the deflection region D of the electron beam 11.

To this end, the length b of the electrode piece 74 is configured to be longer than the vertical space width a between the adjacent stem plates 73 (b≥a).

(In the prior art, the length A of the electrode piece is shorter than the vertical width B between the adjacent stem plates (B <A).)

Thus, the concave end 75 for the internal teeth of the electrode plate 74 was formed.

In addition, the distribution of the electric field e generated by the electrode plate 74 at least in the deflection region D of the electron beam 11 is provided in the vertical direction on the stem plate 73 so as to provide an electric field space for symmetry. The concave indentation portion 76 was provided, whereby the length c in the vertical direction of the electric field space was longer than the length b of the electrode plate (b ≦ c).

An operation state of the image display device according to the present invention having such a configuration will be described.

In the configuration of the unit cell 71 of the horizontal deflection electrode 70, the length b of the electrode plate 74 is configured to be longer than the vertical width a between the adjacent stem plates 73, and the electrode plate 74 is formed. By providing the electric field space so as not to disturb the electric field e distribution by), the electric field distribution in the deflection region D of the electron beam 11 is symmetrical.

Therefore, no distortion such as the shape of the electron beam 11 is crushed to one side does not occur, so that the shape of the electron beam bundle is formed in a regular shape, and the problem of deterioration in image quality is prevented.

Accordingly, in the present invention, a separate shield electrode, which had to be provided in the prior art, is unnecessary in order to correct distortion, and thus, a material and a process are excluded, thereby reducing costs.

The present invention is mainly used for the 14 "type thin image display apparatus.

Such a present invention can be variously substituted, modified and changed without departing from the technical spirit of the present invention for those skilled in the art to which the present invention belongs, it is limited to the actual examples and drawings described above It doesn't happen.

As described above in detail, the image display apparatus according to the present invention

The unit cell of the horizontal deflection electrode is configured such that the electric field distribution is symmetrical in the deflection region of the electron beam,

It prevents the distortion of the electron beam to block the deterioration of the image quality, and the shield electrode, which had to be separately provided in the prior art, is removed, thereby preventing waste of materials, processes, and manpower, thereby improving quality and reducing costs.

Claims (2)

The horizontal and vertical deflection electrodes are electron beams that pass through one of the many through holes formed in the extraction electrode with the linear cathode, the extraction electrode, the control electrode, the focusing electrode, the horizontal and vertical deflection electrodes, which generate electrons in the vacuum vessel. In the image display device which is responsible for classifying a portion of the entire screen increment by Each stem plate 73 is alternately formed on both sides of the (+) and (-) pillar plates 72 and the pillar plates 72, and the horizontal deflection of the electron beam 11 is applied to each stem plate 73. It is provided with a plurality of unit cells 71 formed of the electrode pieces 74 for the passage, The unit cell 71 includes a horizontal deflection electrode configured such that the distribution of the electric field e generated by the electrode plate 74 is at least symmetrical in the deflection region D of the electron beam 11. An image display device. The method of claim 1, The unit cell 71, The length b of the electrode piece 74 is configured to be longer than the vertical width a between the adjacent stem plates 73 (b≥a), A concave end 75 for internal value of the electrode plate 74, The electric field e generated by the electrode plate 74 is recessed upward and downward in the stem plate 73 so as to have an electric field space for symmetry at least in the deflection region D of the electron beam 11. Having a mouth 76, And the length c in the vertical direction of the electric field space is longer than the length b of the electrode plate (b ≦ c).