JPH0411979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray image display device, and particularly to a flat cathode ray image display device that displays highly accurate images with a simpler configuration.

As a conventional example of a flat panel cathode ray image display device, a block diagram of the main parts of a dot matrix type fluorescent display tube is shown in FIG.

In the figure, about 10 to 15 tungsten filaments 3 coated with barium oxide or the like are stretched as linear electron sources in a glass vacuum container 12 in the shape of parallel flat plates facing each other. An electrode 4 for uniformly extracting the electron beam from the filament 3 in a planar manner is arranged near the filament 3 as shown in the figure. This electrode 4 is made of a thin metal plate (e.g.
It is made by etching a plate (about 100μ thick). Furthermore, a strip-shaped electrode 5 is manufactured in the same manner as the electrode 4 and placed between the electrode 4 and the accelerating electrode 6. The accelerating electrode 6 is made into a rectangular shape by vapor deposition on the inner surface of the glass plate 2, and the phosphor 7 is coated on the surface of the accelerating electrode 6.
is coated with. The electrode 5 and the accelerating electrode 6 constitute a matrix type electrode, and the phosphors at the intersections thereof emit light in response to the application of respective signal voltages to the electrodes 5 and 6. In this display device, as long as the electrodes 6 are manufactured by vapor deposition or screen printing, the pitch is quite high (for example, 0.2 to 0.5
mm pitch) can be raised. For the electrode 5, each strip-shaped electrode is etched into a mesh shape, and the holes are shaped so that the electron beam can pass through them to control the electron beam. Further, the electrodes 4 and 5 are spaced apart from each other.

In the conventional display device configured as described above, there is a limit to increasing the pitch of the strip-shaped electrodes 5 (currently 0.4 to 0.6 pitch). This is determined by the limitations of etching the mesh-like strip electrodes and the difficulty of controlling the electron beam. This device is
Although it is practical for displaying characters, numbers, static patterns, etc., it is difficult to display images such as moving images, especially TV displays. This is because driving methods that uniformly diffuse electrons over the entire surface and use line-sequential scanning do not have sufficient volatility for a practical panel, and as mentioned above, it is difficult to obtain sufficient resolution. There is a drawback that it cannot be done.

Flat-type cathode ray image display devices that have improved these two points include one proposed by RCA and Japanese Patent Application No. 106788/1983 previously proposed by the present inventors.

Figures 2A and B show an overview and a diagram of the main parts of RCA's proposal. As shown in the general view shown in FIG. 2A, a back glass plate 21 and a front glass plate 22 constitute the opposing surfaces of the vacuum vessel, and inside the back glass plate 21 there are lead terminals 23 of signal electrodes and vertical deflection electrodes. 24 and other lead terminal portions of the electrodes are arranged to form the general appearance of the display device. The inner surface of the front glass plate 22 is coated with phosphors 25R, G, and B as shown in B. The electron beam source is located in each cell 2.
One filament is provided at each end of each filament, from which the electron beam is taken out along the rear glass plate 21, and a voltage is applied to the vertical deflection electrode to deflect it in the horizontal direction. This is done simultaneously for each cell to deflect the electron beam for one horizontal line in the direction of the phosphor surface.Furthermore, for each cell, the electron beam is deflected horizontally by the horizontal deflection electrode 26, and the color selection mask 2
8 and reaches the phosphor surface 25, where it emits light.

Next, FIG. 3 shows a block diagram of the main parts of the flat image display device proposed by the present inventors in Japanese Patent Application No. 106,788/1982.

In the same figure, 30 is a linear hot cathode, and 10~
Oxide cathode material is coated on a 20μ〓 tungsten wire. Reference numeral 31 denotes a U-shaped or U-shaped partition wall electrode, which is arranged so as to cover the periphery of each linear hot cathode except for the front side, and is opposed to the electrode 32 for extracting the electron beam, and is provided on the electrode 32. The structure is such that a high-density electron beam flows into the through hole 32a. A series of through holes 32a formed in the electrode 32 for extracting the electron beam are formed in parallel and opposite to each linear hot cathode.

33 is a plurality of strip-shaped electrodes, and a through hole 33a is formed coaxially with the through hole 31a formed in the electrode 32. The electrode 34 is an electrode for shaping an electron beam, and has through holes 32a and 33a formed in the electrodes 32 and 33.
A through hole 34 is bored coaxially with the. electrode 36
and 36' constitute an electrode for vertical deflection. Similarly, 37 and 37' are electrodes for horizontal deflection. The electrode 38 is a grid-like electrode and is used to deflect a high voltage applied to the electrode 39 for accelerating the electron beam.
This is an electrode for shielding the electric field so as not to adversely affect the electrodes 7 and 37'. Reference numeral 41 is a transparent glass substrate, on the surface of which is coated a phosphor layer 40 that emits light when an electron beam collides with it, and on the surface of which a thin aluminum film 39 is vapor-deposited. It consists of

In the above base structure, a linear electron beam is taken out from the linear hot cathode, controlled and deflected by each electrode, and impinges on the phosphor to produce a light-emitting display.

As mentioned above, the proposal by RCA and the proposal by the present inventors is extremely different from the conventional example of the configuration shown in Fig. 1 in that the electron beam is focused in a line to create a line-shaped electron beam. , sufficient brightness can be obtained by line sequential scanning.

Furthermore, in terms of resolution, similar to the configuration example shown in Figure 1, it is difficult to configure electrodes with a structure with increased pitch due to difficulties in processing and manufacturing the strip-shaped electrodes. By deflecting the beam horizontally and vertically, resolution can be further increased. For example, if strip-shaped electrodes are arranged at a 1 mm pitch and an electron beam is made to hit a phosphor without a deflection electrode, the bright spot emitted by the electron beam will be one per 1 mm, and the bright spot will be at a 1 mm pitch. are arranged in However, if a deflection electrode is inserted and the electron beam is focused sufficiently, bright spots will appear that emit light from several to more than ten locations within 1 mm, and the pitch of the bright spots will increase from 0.5 mm to 0.01 mm, and even further. It is also possible to reduce the pitch, which increases the resolution sufficiently.

As mentioned above, using a linear electron beam, further,
A flat plate cathode ray image display device using deflection electrodes is
Although it has sufficient brightness and resolution for practical use, the following problems make it difficult to achieve higher resolution.

The problems will be discussed below. After the linear electron beam passes through the electron beam through hole of each of the plurality of strip-shaped electrodes, it is divided into a plurality of pieces. One electron beam is deflected vertically and horizontally in several steps, or in more than ten steps. Figure 4 A, B horizontally 3
The position and shape of the bright spot are shown when the beam is deflected vertically in seven steps. For horizontal and vertical deflection, the electrode configuration,
Depending on the electrode voltage, the electron beam trajectory becomes barrel-shaped as shown in A, or pincushion-shaped as shown in B. Furthermore, the shape of each electron beam spot is significantly deformed as shown in the figure. When deflecting an electron beam, deflection distortion,
Aberrations and distortions occur, and it is difficult to completely eliminate them.

Taking the electron beam trajectory and shape as shown in Figures 4A and B as one block, hundreds to hundreds of thousands of such blocks are arranged side by side on the image display surface to form an image on the entire screen. However, as shown in FIGS. 4A and 4B, if barrel-shaped or pincushion-shaped distortions occur in the electron beam spot in each block, adjacent blocks overlap or separate from each other, resulting in distorted images. This is extremely unsightly and poses a practical problem.

To summarize the above, in the flat image display device previously proposed by the inventors, the electrode configuration is
This is not a matrix type electrode configuration corresponding to each pixel as shown in the figure, but a matrix type electrode configuration corresponding to each group of a plurality of pixels (one block). The structure is such that one electron beam is deflected vertically and horizontally to strike each of a plurality of pixels in one block. By adopting such a configuration, it is possible to provide a device that can display images with extremely high resolution and high brightness compared to a matrix type electrode configuration corresponding to a single pixel. However, when the electron beam is deflected vertically and horizontally at the same time, as with conventional CRTs (cathode ray tubes), each block inevitably suffers distortion due to aberrations in the electron beam diameter, and barrel-shaped or pincushion-shaped electron beam trajectories. Distortion occurs, and when the blocks are combined to form a single image on the entire screen, a clear and detailed image cannot be achieved.

The present invention eliminates the above-mentioned drawbacks of the conventional technique, and each pixel block is constructed by deflecting the electron beam only in the vertical direction by using only vertical deflection electrodes without providing any electrodes for horizontal deflection. This configuration prevents the conventional barrel-shaped and pincushion-shaped distortions and provides detailed and clear images.

That is, the present invention comprises a linear electron source and an electron beam extraction electrode in a vacuum container, and furthermore, a deflection electrode for deflecting the electron beam is arranged parallel to the linear electron source and deflected perpendicularly thereto. a pair of vertical deflection electrodes, and an electron beam control electrode that divides the linear electron beam into a plurality of pieces and controls each divided electron beam.
An electron beam control electrode is an electrode consisting of a plurality of wire electrodes arranged in parallel and supported by an intermediate support part, and a light emitting surface such as a phosphor that emits light when struck by an electron beam. The wire direction of the wire electrode of the linear electron source and the electron beam control electrode is arranged orthogonal to each other, and the linear electron source and the deflection electrode are arranged parallel to each other, resulting in a simpler configuration. The present invention provides a cathode ray image display device that displays highly accurate images.

Next, a cathode ray image display device according to an embodiment of the present invention will be explained using FIG.

In FIG. 5, the linear electron source 51 is connected to the back electrode 52.
and the electron beam extraction electrode 53, and applies a relatively positive voltage to the electron beam extraction electrode 53 with respect to the linear electron source 51 to extract the linear electron beam. The linear electron beams are deflected all at once in the vertical direction by a pair of vertical deflection electrodes 54 arranged in parallel. Further, an electron beam control electrode is constructed of an electrode 55 that divides the linear electron beam into a plurality of pieces, an electrode 56 in which wires are arranged in parallel strips, and an electrode 57 that also serves as horizontal focusing. By applying various signal voltages to the electrodes 56 on which the wires are arranged, the amount of each electron beam is controlled, and the electron beams emit light onto the accelerating electrode surface 58 and the phosphor surface 59 to produce an image. Display. 60 is a transparent glass plate. Of course, for a plurality of linear electron sources, a pair of vertical deflection electrodes is disposed on each linear electron source. In the cathode ray image display device having the above structure, the order of the vertical deflection electrodes and the electron beam control electrodes may be changed. At this time, the electron beam extraction electrode 53 and the electrode 55 can be made the same and serve as the same electrode.

The cathode ray image display device of this embodiment, which is constructed as described above, does not have any electrodes for horizontal deflection, and uses only electrodes for vertical deflection to deflect the electron beam only in the vertical direction, so that each pixel is By making this structure, the conventional barrel-shaped and pincushion-shaped distortions hardly occur.
Further, the aberration of the electron beam diameter has been greatly improved since it is caused only by vertical deflection, and the aberration caused by vertical deflection is extremely small, resulting in clear and detailed images.

To explain in more detail the cathode ray image display device shown in FIG. 5 which is an embodiment of the present invention, the linear electron source 5
1 is made of a linear electron emission source made of a tungsten wire with a wire diameter of 0.015 to 0.020 mm coated with oxides (BaO, SrO, CaO etc.). Arrange 10 to 20 of these in parallel. Further, the back electrode 52 is made by depositing In ₂ O ₃ on a glass plate. . This may be a metal plate. The electron beam extraction electrode 53 has a plate thickness of 0.15
It is made by etching a 42-6 alloy (42% Ni, 6% Cr, 52% Fe) plate and drilling a slit width of about 1.0 mm. Then, the linear electron source 51 is connected to the back electrode 52.
and the electron beam extraction electrode 53 at a distance of 5 mm. The vertical deflection electrodes 54 are constructed by applying silver paste or the like on a long and thin glass plate with a height of about 10 mm and a thickness of about 1.0 mm, and are arranged in parallel with the linear electron sources 51 at a pitch of 10 mm. There is.
Furthermore, the electrodes 56 and 57, which constitute a part of the electron beam control electrode, are made of a 42-mm plate having a thickness of 0.15 mm as described above.
It is made by etching 0.2 x 9.0 mm slit holes horizontally at 0.4 mm pitch (of course, the vertical holes are drilled at 10.0 mm pitch). The wire electrode 56 has a diameter of approximately 0.05 mm and has an intermediate support 6 disposed between the elongated slit holes 61 of the electrode 57, as shown in FIGS. 6A and 6B.
2 is supported and fixed. This intermediate support part 6
2, for example, screen prints fritted glass to a height of about 0.2 to 0.3 mm, bakes it to vitrify it, and then creates 632 recesses of about 0.06 to 0.07 mm at intervals of 0.015 mm on top of it, and makes a pair of these. They are arranged at a pitch of 0.4 mm and fired to form vitrification. Alternatively, after vitrifying the glass, a recess is formed, a wire electrode is stretched over the recess, frit glass is applied, and the glass is fired and vitrified. Further, as shown in FIG. 6B, the end support portion is formed by etching a long and thin metal plate to form a guide plate 64 with the same shape and pitch as the recess, and a support base 65 made of ceramic or metal. The wire electrode is pulled out from a guide fixed to the wire, tension is applied, fritted glass is screen printed on top of the wire electrode, and the wire electrode is fixed after firing and vitrification. Accelerating electrode surface 58 and phosphor surface 5
9 is formed in a conventional manner. Of course, when the acceleration electrode surface 58 is not an Al surface, the phosphor surface 59
, on the contrary, is applied not on the glass plate 60 but on the transparent accelerating electrode surface.

As described above, the cathode ray image display device of the present invention has the advantage that it does not have the conventional horizontal deflection electrode, does not require alignment with the electron beam control electrode, and can be constructed more easily. Furthermore, as described in the specific embodiment above, by constructing part or all of the electron beam control electrodes as wire electrodes supported by an intermediate support part, the electrode pitch can be reduced to 0.4 mm.
This has the effect of making it possible to obtain high resolution and display highly accurate images with almost no distortion. Of course, it depends on the size, but 0.1mm
It is also possible with pitch. At this time, a tungsten wire with a wire diameter of 0.01 to 0.02 mm is used for the electron beam control electrode.

[Brief explanation of drawings]

FIG. 1, FIG. 2A, B, and FIG. 3 are diagrams showing conventional cathode ray image display devices, and FIG. 4A, FIG.
B is a diagram for explaining barrel distortion and pincushion distortion that occur in conventional cathode ray image display devices, FIG. 5 is an exploded perspective view of a cathode ray image display device according to an embodiment of the present invention, and FIG. 6A , B are perspective views of essential parts of the device. 51... Linear electron source, 52... Back electrode, 53
... Electron beam extraction electrode, 54 ... Vertical deflection electrode, 55 ... Electrode for dividing the linear electron beam.
56... Electrode with wires lined up, 57... Electrode that also serves as horizontal focusing, 58... Accelerating electrode surface, 59
... Phosphor surface, 60 ... Transparent glass plate, 62 ...
Intermediate support.

Claims (1)

[Claims] 1 A linear electron source, an electron beam extraction electrode for extracting a linear electron beam from the linear electron source, a deflection electrode for deflecting the linear electron beam, and a plurality of the linear electron beams are placed in a vacuum container. In the cathode ray image display device, the cathode ray image display device includes an electron beam control electrode for controlling each divided electron beam, and an accelerating electrode having a light-emitting surface that emits light upon impact of the electron beam. The electrode is composed of a plurality of wire electrodes having an intermediate support part, and the wire directions of the linear electron source and the electron beam control electrode are arranged perpendicularly to each other, and the linear electron source and the deflection electrode are cathode ray image display devices arranged parallel to each other.