JPH067461B2 - Image display device - Google Patents

Description

The present invention relates to a flat image display device for displaying characters and images by an electron beam, and more particularly to a large image display device intended for large screen display.

Conventionally, an attempt has been made to obtain a flat color image display device by deflecting an electron beam obtained from a substantially flat electron source, but it has not been realized yet.

The inventors of the present invention have proposed a Japanese Patent Application No. 55-
In No. 107468, an image display device having a structure as shown in FIG. 1 was proposed as an example. In the figure,
Reference numeral 12 denotes a part of the envelope, which is composed of a glass container. A back electrode 13 is provided inside the envelope 12 by vacuum deposition or the like. 14 is a linear hot cathode,
For example, the surface of tungsten having a diameter of 10 to 20 μφ is coated with an electron emitting material. 15 is the linear hot cathode 14
A first grid electrode for taking out the electron beam emitted from the device, and a slit-shaped through hole 16 is provided along the linear hot cathode 14. It is desirable that the slit-shaped through-hole 16 is one through-hole over the entire length, but when it is particularly long, it is formed in a ladder shape in which crosspieces are inserted at appropriate intervals and a plurality of slits are arranged in a row. Good. 17
Is a first deflecting electrode means formed of a pair of electrode substrates 18, and each electrode substrate 18 is arranged below the first grid electrode 15 so as to be parallel to the through hole 16, and Deflection electrodes 19 and 19 are stretched on the surface.
Positive and negative voltages are applied to the pair of deflecting electrodes 19 facing each other so that the electron beam is deflected perpendicularly to the surface of these deflecting electrodes 19. Reference numerals 20, 21 and 22 are second grid electrodes, third grid electrodes and electron beam modulation electrodes, which constitute an electron beam control electrode means 23 for modulating the electron beam that has passed through the first deflection electrode means 17, respectively, and are laminated on each other. Arranged in a shape. Slit-shaped through holes 24, 25 are provided at equal intervals in the respective electrodes 20, 21, 22 in a direction substantially orthogonal to the linear hot cathode 14. Below the electron beam control electrode means 23 composed of these electrodes 20, 21, 22 a plurality of electrode pieces 26a are arranged in stripes so as to be parallel to the through holes 24, 25. The deflecting electrode means (horizontal deflecting electrode) 26 is arranged, and two adjacent electrode pieces 26
a and 26a constitute a pair of deflection electrodes, and an arbitrary pair of electrode pieces
A slit-shaped through hole of the control electrode means 23 is provided between 26a and 26a.
There is a one-to-one correspondence with 24 and 25. Reference numeral 27 denotes a fluorescent material layer 30 on a part of the back surface of the envelope 12 composed of a transparent glass container and a metal back layer 3 on the surface thereof.
1 is a display panel formed by stacking 1 of the above.

The second deflecting electrode means 26 and the display plate 27 may be hollow, but in the case of constructing a particularly large surface image display device, it is necessary to evacuate the inside of the container. It is necessary to have an electrode structure capable of withstanding atmospheric pressure, and as a result, as shown in FIG.
It is desirable to provide 8. The accelerating electrode means 28 has a pair of accelerating electrode substrates 29, 29 formed of an insulating substrate and arranged to face each other in parallel with the linear hot cathode 14, and a plurality of stripes are formed on the surface of each accelerating electrode substrate 29. The stripe electrodes 32 are arranged side by side, and the acceleration voltage can be divided and applied by the plurality of stripe electrodes 32. The acceleration electrode means 28 is
Are arranged in parallel to the positions corresponding to the deflection electrode means 17. 33 is a thin metal plate, which is the acceleration electrode substrate 29.
Are fitted to the lower end of the so as to be orthogonal to each other.

The conventional image display device has the following problems. As described above, the conventional image display device has the metal plate 33 between the accelerating electrode substrate 29 and the phosphor layer 30 in order to have a structure that can withstand the atmospheric pressure. 33 has a structure in which the metal plates 33 are directly fitted in a concave shape, and the metal plate 33 is arranged on the black stripe layer 36 for the purpose of aligning the horizontal deflection electrode 26 and the phosphor layer 30. Was there. This is an inevitable fitting form to avoid instability in which only one of the concave fittings has a very high probability that one of them will fall down when atmospheric pressure is applied. Therefore, the fitting parts are fitted in a concave shape. This turned out to be one of the major problems. When assembling the panel, the alignment of the phosphor portion, especially the black stripe, is extremely complicated because it requires a large number of process steps if the large housing and the metal plate 33 are fitted in advance and then the phosphor surface is aligned. There was a problem. further,
In the panel manufacturing process, a temperature raising step of about 450 degrees is required for sealing, and at this time, the acceleration electrode substrate 2 is used.
9 expands considerably in the longitudinal direction. As a result, the fitted metal plates are partially deformed. For example, when a horizontal deflection voltage is applied to a pair of deflection electrodes for color display, in the conventional image display device, the metal plate 33 undergoes thermal deformation due to a thermal process, and a black stripe is formed. An error occurs in the alignment between the horizontal deflection electrode 26 and the phosphor layer 30, which is curved, and the electron beam deflected in the horizontal direction is red phosphor layer R of the phosphor layer 30 on the display plate 27. There is a problem that the positions of the phosphors of the insulating phosphor layer G and the blue phosphor layer B are not accurately reached, and partial color unevenness or the like occurs and the image quality is significantly deteriorated. In addition, the metal plate 33 and the phosphor layer 30
Since the striped phosphors are in direct contact with each other, the stripe-shaped phosphors are damaged by the contact with the second anode electrode 35, causing the phosphors to be missing or the like, and the quality of the display surface of the image display device is There is also a problem that it significantly decreases.

The present invention solves the above problems and provides an image display device which has a structure capable of sufficiently withstanding atmospheric pressure and is easy to manufacture for improving the image quality of the image display device and stabilizing the quality. It is intended to be provided.

Hereinafter, examples of the present invention will be described in detail. FIG. 2 is a sectional view of an essential part of an image display device according to an embodiment of the present invention, in which parts common to those in FIG. 1 are designated by the same reference numerals.
Further, FIG. 2 corresponds to a cross-sectional view of the broken line portion of FIG. 1 as seen in the direction of arrow A, for example.

In FIG. 2, reference numeral 27 denotes a transparent glass container, on the inner surface of which a black stripe layer 36, red fluorescent stripe layers 37 alternately arranged, a marginal fluorescent stripe layer 38, and a blue fluorescent layer are arranged. Stripe layers 39 for use, and the display surface is formed by laminating the metal back layer 31 on the surfaces thereof. Reference numeral 35 is a first anode electrode plate made of a thin metal plate, and a convex portion 35a is provided on the display surface side of the first anode electrode plate 35. The convex portion 35a is located between the blue fluorescent stripe layer 39 and the red fluorescent stripe layer 37 and the black stripe layer 36.
Is provided at a position corresponding to. Reference numeral 34 denotes a first anode electrode plate 35 which is fitted in a grid pattern with the first anode electrode plate 35 by a notch (not shown) provided at a position facing the convex portion 35a of the first anode electrode plate 35. 2 is the anode electrode plate. Reference numeral 29 is an accelerating electrode plate in which a plurality of stripe-shaped electrodes 32 are formed on an insulating substrate by printing or the like. Alignment marks 32a, 32 are provided on the upper and lower sides of the acceleration electrode plate 29.
b is formed by printing. The accelerating electrode plate 29 is fitted coaxially with the first anode electrode plate 35 so as to be orthogonal to all the second anode electrode plates 34 at the position of the alignment mark 32b. Reference numeral 26 is a horizontal deflection electrode for deflecting the electron beam in the horizontal direction (left and right direction in the drawing). The horizontal deflection electrode 26 is a pair of adjacent electrode pieces 26.
It is configured by arranging a number of a and 26a as one set. The electrode pieces 26a are provided with alignment marks 26b by etching or the like so as to correspond to the alignment marks 32a on the acceleration electrode plate 29 in a one-to-one correspondence. The deflection electrodes 26 are laminated and integrated with other electrodes (for example, electrodes such as the control electrode means 23 shown in FIG. 1) arranged above them. The slit between the electrode piece 26a and the adjacent electrode piece 26a serves as a so-called electron beam passage hole. Although not shown in the drawing, it goes without saying that the horizontal electrode is laminated and integrated with another electrode group and is arranged above the acceleration electrode plate.

Next, regarding the material and dimensions of the display surface and the anode of the image display device in the embodiment of the present invention shown in FIG. 3, FIG.
Details will be described with reference to FIG.

The fluorescent display surface is a black stripe layer 36 having a width of about 200 μm separated in the horizontal direction of the screen on the inner surface of the glass container 27, and R, G, B color stripe layers having a width of about 250 μm alternately arranged between them. 37, 38, 39, and a metal back layer 31 made of Al vapor-deposited thereon with a thickness of about 1000 to 1500Å.

The anode plate is made of 42-6 alloy (Fe5
2%, Ni 42%, Cr 6%) formed by etching were used, and they were fitted in a lattice shape as shown in FIG. The first anode electrode plates 35 were arranged parallel to the longitudinal direction of the display surface and at equal intervals so as to be orthogonal to the stripe layer of the fluorescent display surface. The interval between the convex portions 35a provided on the lower side of the first anode electrode plate 35 is the fluorescent stripe 37 to
Although it may be the same as the trio pitch of No. 39, it is set to 3 to 5 times in terms of etching processing. In addition, the convex portion of the first anode electrode plate 35
A notch 35b for fitting with the second anode electrode plate 34 is provided at a corresponding position on the opposite side of 35a. The number of the cut portions 35b may be the same as the number of the convex portions 35a, but
I made it about 1/3. The second anode electrode plate 34 has a protrusion 34a so that it can be fitted into the cut portion 35b of the first anode electrode plate 35, and is arranged in parallel with the stripe layer.

As shown in FIG. 4, the accelerating electrode substrate 29 has a stripe-shaped electrode 3 formed by screen printing on an insulating substrate such as glass having a thickness of about 1 mm so that the mutual distance can be sufficiently maintained.
What formed 2 is used. At the same time, alignment marks for aligning the second anode electrode plate 34 and the horizontal deflection electrode plate 26 are printed on the lower side and the upper side of the acceleration electrode substrate 29 at the same pitch as the mutual spacing of the second anode electrode plate 34. Formed. The accelerating electrode substrates 29 are arranged parallel to each other and coaxially with the first anode electrode plate 35 at the same interval in the longitudinal direction of the screen so as to be fitted at right angles to the second anode electrode plate 34.

The horizontal deflection electrode 26 can be formed, for example, by etching a 42-6 alloy having a thickness of about 200 μm. At the same time, in order to easily perform alignment with the acceleration electrode substrate 29, alignment marks are formed on the same electrode. Formed.

A desired image display device can be obtained by sequentially combining the electrode groups.

If the first and second anode electrode plates 35, 34 are made of a metal plate whose expansion coefficient is equal to the expansion coefficient of the display plate, there will be no deviation between the two due to temperature changes.

The effects of the image display device of the present invention will be described below. According to the present invention, first and second anode electrode plates fitted in a grid pattern are arranged between an acceleration electrode substrate and the display plate, and the acceleration electrode and the second anode electrode plate are fitted together. Can withstand atmospheric pressure, and the first and second anode electrode plates fitted in a grid pattern in advance can be arranged independently so that alignment with the phosphor screen can be made extremely easy. After that, the acceleration electrode substrate can be easily fitted to the second anode electrode plate. That is, there is an effect that manufacturing is extremely easy. Furthermore, by arranging the acceleration electrode substrate and the first anode substrate coaxially and at the same interval, the first anode electrode plate can be affected by the expansion in the longitudinal direction of the acceleration electrode substrate during the thermal process. There is an effect that thermal deformation does not occur, that is, the electron beam can impinge on the normal position of the fluorescent screen and the image quality can be improved. Further, among the first and second anode electrode plates fitted in a grid pattern, by providing a convex portion on the display plate side of the first anode electrode plate, scratches due to contact on the fluorescent screen are extremely small. This has the effect of hardly affecting the image quality. Further, by arranging the convex portion on the black stripe layer of the display plate, there is no scratch on the phosphor screen, which has an effect of significantly improving the image quality. In addition, by forming the first and second anode electrode plates with metal plates whose expansion coefficient is substantially the same as that of the display plate, there is no possibility of damaging the fluorescent screen in the thermal process step of manufacturing the panel, and the image quality is improved. Has the effect of improving.

As described above, the image display device of the present invention is superior in terms of manufacturing and image quality and has a great industrial utility value.

[Brief description of drawings]

FIG. 1 is a perspective view of an image display device previously developed by the present inventors, FIG. 2 is a sectional view of an essential part of the image display device in one embodiment of the present invention, and FIG. 3 is an image display of FIG. FIG. 4 is a perspective view of a fitting portion of an anode plate in the apparatus, and FIG. 4 is a sectional view in a direction different from that of the image display apparatus of FIG. 26 ... Second deflection electrode means (horizontal deflection electrode), 27
.... Display plates (glass containers), 26a, 26b ...- Electrode pieces,
29 ... Accelerating electrode substrate, 31 ... Metal back layer,
32 ... Striped electrodes, 32a, 32b ... Marks,
34 ... 2nd anode electrode plate, 34a ... Protrusion, 35 ...
・ ・ ・ ・ ・ First anode plate, 35a ・ ・ ・ ・ ・ ・ Convex part, 35b ・ ・
Notch, 36 ... Black stripe layer, 37 ...
・ ・ ・ Stripe layer for red fluorescence, 38 ・ ・ ・ Stripe layer for green fluorescence, 39 ・ ・ ・ Stripe layer for blue fluorescence

Claims (5)

[Claims] 1. An electron source having a hot cathode, a plurality of electron beam control electrodes for modulating an electron beam emitted from the electron source, deflection electrodes for deflecting the electron beam, and deflected electrons. An image display device comprising an accelerating electrode for accelerating a beam, and a display plate having a phosphor layer that emits light by collision of an electron beam, in a grid pattern between the accelerating electrode and the display plate. An image display device characterized in that the fitted first and second anode electrode plates are arranged, and the second anode electrode plate is fitted to the acceleration electrode. 2. The image display device according to claim 1, wherein the acceleration electrode substrate and the first anode electrode plate are arranged coaxially and at the same interval. 3. A convex portion is provided on an end surface of the first anode electrode plate which is in contact with the display plate.
The image display device according to item 2 or item 2. 4. The display device according to claim 1, wherein the convex portion of the first anode electrode plate is arranged so as to abut on the black stripe layer provided between the phosphor stripe layers of the display plate. The image display device according to item 2 or 3. 5. The first and second anode electrode plates are formed of a metal plate whose expansion coefficient is substantially the same as that of the display plate. The image display device according to item 3 or 4.