JPS5830052A - Plate-like picture display apparatus - Google Patents

Abstract

PURPOSE:To obtain a color picture with high resolution and high vividness by preparing an electrode means for crossing each electron beam flux controlled corresponding to an electrode pair and a shadow mask having numbers of through holes corresponding to phosphor substances. CONSTITUTION:A belt-shaped electron beam is taken out from one of plural linear thermal cathodes 4 which are stretched over in parallel, to be focussed and deflected for obtaining plural scanning lines. One linear thermal cathode shares 1/15 of one picture to be displayed. One set of three electron beams controlled by a switching stack composed of electrode plates 9, 11a, 11b, 11c and 13 are deflected toward the center of two electron beams of both terminals among three electron beams by electrodes 15a and 15b negatively impressed in relation to the neiboring electrodes. Three electron beams are controlled so as to concentrate on the surface of a shadow mask.

Description

[Detailed Description of the Invention] The present invention displays images such as two characters by controlling an electron beam with a control electrode such as an XY matrix electrode, and further accelerating the electron beam and causing it to strike a phosphor film. The present invention relates to a flat image display device, and particularly provides a flat image display device equipped with means for obtaining a clear and highly concentrated color image.

Conventionally, an electron beam is extracted from a substantially flat electron source, the electron beam is controlled by a matrix type electron beam control electrode arranged in a plane, and the electron beam is further accelerated to impinge on a phosphor film. Image 2 by letting
2. Description of the Related Art Flat image display devices that display characters, etc. have been proposed.

However, in this type of device in which the electron beam is controlled by matrix type electron beam control electrodes, the processing precision and assembly precision of the control electrodes must be high in order to obtain high-resolution images, but the The ability to increase the resolution of images by increasing the resolution was approaching its limit. Therefore, in order to obtain a high-resolution image equivalent to that of a normal television device in a flat image display device, it is necessary to use some other means to improve the image display device.

As a flat image display device that overcomes the limitations in manufacturing technology, a device that obtains a high resolution image by combining a matrix type electron beam control electrode with an electron beam deflection electrode has been developed.

However, even in image display devices equipped with such electron beam deflection electrodes, it is difficult to focus the electron beam and make it hit the phosphors provided at predetermined positions in a fine pattern with high precision. This was difficult in terms of precision and assembly accuracy. Especially when displaying color images,
An electron beam focused to a beam diameter of 200μ or less is
It is necessary to sequentially bombard each pixel of a color phosphor with an accuracy of 0 μ or less, and it has been difficult to obtain clear, high-resolution color images using conventional electrode configuration techniques.

The present invention provides a flat plate that extracts an electron beam from a plurality of linear cathodes, controls the electron beam by a plurality of electron beam control electrodes, accelerates the electron beam, and makes it impinge on a phosphor film to emit light. In the image display device, an electrode means for intersecting each electron beam flux controlled in accordance with an electrode set formed by combining a plurality of the electron beam control electrodes, and an electrode means for deflecting the electron beam. It is characterized by comprising an electrode means and a shadow mask having a large number of through holes corresponding to the phosphor.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A flat image display device according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an exploded perspective view of a flat image display device according to an embodiment of the present invention.

In the figure, numeral 1 indicates a part of the back surface of a vacuum container in which electrodes and other members are vacuum sealed, and a glass container is generally used as the vacuum container. 2 is a back electrode provided on the inner surface of the vacuum container 1, and this back electrode 2 can be formed by vacuum evaporating a conductor such as metal, but it may also be formed using a metal plate. This is a linear cathode wire made of tungsten wire or the like, and the surface of this linear cathode ray 3 has (Ba
An electron emitting material made of v Ca , Sr ) C'03 or the like is applied to form the linear hot cathode 4 . .

Reference numeral 5 denotes an electrode for extracting an electron beam from the linear hot cathode 4, and this electrode 5 is provided with a slit-shaped through hole 6 that is approximately parallel to the linear hot cathode 4. It is an insulating substrate, and electrodes 8 and 8' for deflecting the electron beam vertically (in the front-rear direction toward the plane of the paper) are provided on their main surfaces.

The linear hot cathode 4, the slit 6 provided in the electrode 5 for extracting the electron beam, and the center lines of the electrodes 8 and 8 for deflecting the electron beam are arranged in parallel and on the same plane. There is.

Electrodes 9.11a, 11b, 11c and 13 constitute a switching stack that controls the passage of the electron beam. The electrode plate 9 is provided with a through hole 70 that is substantially orthogonal to the through hole 6 provided in the electrode plate 6, and the band-shaped electron beam that passes through the through hole 6 provided in the electrode plate 6 passes through the through hole 6 provided in the electrode plate 9. The electron beams are divided into a group of three electron beams by the slit-like through hole 1o.The electrodes 9 and 13 are kept at an appropriate interval, and the electron beam control electrodes 11a, 11b and 1
1c are inserted as one set, and each electrode 11
Slit-shaped through holes 12 are provided in a, 11b, and 11c. Electron beam control electrode 11a.

For example, when displaying a color image, electric signals corresponding to phosphors that emit red, green, and blue light can be applied to 11b and 11c.

A set of three electron beam control electrodes 11a, 11b and 1
By providing a large number of sets of 1c at regular intervals, the image display surface can be made wider.

Reference numeral 14 denotes an insulator plate, and on both sides thereof there are electrodes 15a and 15a for making the three electron beams controlled by the three electron beam control electrodes 11a, 11b and 11c intersect at one point on the surface of the shadow mask 17. 15b is provided. Further, this insulating plate 14 is provided with horizontal deflection electrodes 16a and isb for deflecting the three intersecting electron beams to the left and right. Reference numeral 17 denotes a shadow mask, and this shadow mask 17 is provided with a large number of through holes 18 in a grid pattern, and a set of three colors of color fluorescent light is provided on the surface of the display panel 21 corresponding to each through hole 18. A body 2o is provided.

The display plate 21 can be a part of a transparent glass container, the surface of which is coated with a phosphor 2o, and further coated with a thin film such as A/ to form a so-called metal back. has been done.

The operation of the flat image display device having the above configuration will be explained below.

In FIG. 1, a band-shaped electron beam is taken out from one of a plurality of linear hot cathodes 4 stretched in parallel, and is focused and deflected in the vertical direction to obtain a plurality of scanning lines.

When a plurality of linear hot cathodes 4 (only one is shown in FIG. 1) are sequentially driven to display one screen worth of scanning lines 9, for example, a television image, 16 linear hot cathodes are used. By stretching the cathode and applying 16 levels of deflection voltage to the vertical deflection electrodes 8 and 8', 240 scanning lines can be obtained. Therefore, one linear hot cathode is used to display 15 parts of one screen.

Electrode plates 9, 11 &, 1lb, , 11C
A set of three electron beams controlled by a switching stack composed of O and 13 is connected to both terminals of the three electron beams by electrodes 16a and 16b, which are applied relatively negatively to the surrounding electrodes. The two electron beams are deflected toward the center, and the three electron beams are controlled so that they converge at one point on the surface of the shadow mask 17.

Next, the above-mentioned operation will be explained in further detail using FIG. 2, which is a cross-sectional view of a main part of the flat image display device shown in FIG. 1.

FIG. 2 shows a conceptual diagram of the trajectory of an electron beam passing between electrodes.

Electron beam 22 controlled by a switching stack consisting of electrodes 9.11a, 11b, 11c and 13
a, 22b and 22c are focusing electrodes 15a and 15
b toward the center, and further deflected horizontally by horizontal deflection electrodes 16a and 16b, passing through one through hole 18 provided in shadow mask 17, and provided corresponding to this through hole 18. fluorescent material 20 a
, 20b and 20c, and the positions of the three through holes 18 and the phosphor that emit light are determined by the energy and incident angle of the electron beam when the electron beam enters the shadow mask.

Determined by acceleration voltage, etc.

Therefore, by appropriately selecting the through-holes in the shadow mask and the driving voltage, a screen of any size can be constructed by arranging multiple linear hot cathodes and multiple sets of electron beam control electrodes in a matrix. be able to. In addition, by arranging the through holes in the shadow mask to correspond to each phosphor, the electron beam can strike each phosphor accurately, producing clear color images with high resolution. Obtainable. Furthermore, this shadow mask cuts the electron beam between adjacent phosphor sections.

Discontinuities due to overlap etc. can be eliminated and uniform and clear images can be obtained.

As explained above, the flat image display device of the present invention can not only obtain color images with significantly higher resolution and higher sugar saturation than conventional image display devices using an electron beam control method using matrix electrodes. , it is possible to eliminate discontinuities caused by two overlapping electron beam cuts at the boundary between adjacent units, and it is possible to obtain a uniform image.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of a flat image display device according to an embodiment of the present invention, and FIG. 2 is a sectional view of the main parts of the same device. 4... Linear cathode, 5... Electrode for extracting the electron beam, 6... - Through hole, 7, 7'-
--Insulating substrate, 8, 8'... - Electrode for deflecting the electron beam, 9.11'a, 11b, 11c, 13.
-... Electrode for controlling passage of electron beam, 16a. 1sb... Electrode for crossing electron beams, 1ea, 1sb... Horizontal deflection electrode, 17...
...Shadow mask, 2o... Fluorescent material, 21
...Display board. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Illustration 25g

Claims (2)

[Claims] (1) A flat plate in which an electron beam is extracted from a plurality of linear cathodes, the electron beam is controlled by a plurality of electron beam control electrodes, and the beam is accelerated and impinged on a phosphor film to emit light. In the image display device, an electrode means for intersecting each electron beam flux controlled in accordance with an electrode set formed by combining a plurality of the electron beam control electrodes, and an electrode means for deflecting the electron beam. and a shadow mask having a large number of through holes corresponding to the phosphors. (2) A flat image display device according to claim 1, characterized in that the electrode means for intersecting the electron beam flux and the electrode means for deflecting the electron beam are provided on the surface of the same insulating substrate. .