JPH0384837A - Plane cathode-ray tube display device - Google Patents

Abstract

PURPOSE:To prevent the phenomenon of lack of picture elements from arising due to spot destruction of an anode and fluorescent material and also prevent unevenness in brightness from arising due to imperfect contact by bringing pressure supporting bodies into contact with anode via a conductive stress dispersing member. CONSTITUTION:A pressure supporting means 28 has an opening for exposing the display area of a fluorescent material 24 and comprises a conductive stress dispersing member 34 taking the form of a lattice frame and making electrical contact with an anode 22, and a plurality of pin-shaped pressure supporting bodies 36 disposed between the conductive stress dispersing member 34 and an electrode structure body 20 to support the inside of an envelope 18 against pressure. Thus pressure from the pressure supporting bodies is dispersed by the action of dispersing stress by the conductive stress dispersing member 34 and so spot destruction of the anode 22 as fluorescent display means and the fluorescent material 24 is prevented. Also the pressure supporting bodies make contact with the anode 24 in a wide area via the conductive stress dispersing member 34; the phenomenon of lack of picture elements and unevenness in brightness are therefore prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flat cathode ray display device used for displaying characters and graphics, and in particular to a flat cathode ray display device that has an improved means for supporting its electrode structure with withstanding pressure. It is related to the device.

(Prior Art) Cathode ray display devices such as flat CRTs and fluorescent display tubes are different from flat cathode ray tubes, so the wall thickness of the side walls, especially the flat part of the fluorescent Is it possible to increase the thickness of the front substrate and back panel that have the display surface? If this is done, the panel becomes heavier and thicker, which has the disadvantage of not being able to meet the demands for lighter and thinner display devices. there were.

Several flat cathode ray display devices have been proposed that avoid this drawback and can achieve a large screen, weight reduction, and thickness reduction. These display devices include an envelope, an electrode structure disposed inside the envelope, a fluorescent display means consisting of a phosphor integrally provided on an anode on the front substrate of the envelope, and an exterior. and pressure-resistant support means for pressure-resistant supporting the inside of the enclosure.

The pressure-resistant support means of the prior art consists of a plurality of flat plate-like pressure-resistant supports that are provided in an envelope and support the electrode structure with pressure resistance (for example, SID, DIGEST, 1980, p. 26 and special edition). (Refer to Kaisho 61-216225),
In addition, other prior art pressure-resistant support means are formed into a lattice shape by providing appropriate notches in two sets of flat plate supports and assembling these flat plate supports orthogonally and aligning the notches (as disclosed in Japanese Patent Application Laid-Open No. (Refer to Japanese Patent No. 163540/1982), and another prior art pressure supporting means is made up of a plurality of pressure supporting bodies in the form of metal pins for the purpose of weight reduction.

5 and 6 show an example of a flat cathode ray display device having a pressure-resistant support means of the prior art consisting of a flat plate support. An envelope 18, an electrode structure 20 disposed within the envelope 18, and a front substrate 1 of the envelope 18.
A fluorescent display means 26 consisting of a phosphor 24 provided integrally with an anode 22 of ITO (Int 03 "Snow") or aluminum on 2, and a pressure-resistant support means 28 for supporting the inside of the envelope 18 with pressure resistance. Electrode structure 2
0 consists of a cathode, which is an electron source, and an electrode group that controls the amount of electrons from the electron source and focuses and deflects the electron beam. After assembling the inside of the envelope 18, the envelope 18 is heated and evacuated through an exhaust pipe (not shown) for degassing, and is subjected to vacuum treatment to further increase the degree of vacuum using a getter.

The pressure support means 28, as can be seen in FIG. A plurality of protruding pins 32 are provided integrally protruding from the
In addition to the function of supporting the envelope 18 with pressure resistance, the pressure support 30 has the function of a deflection electrode that deflects the electron beam emitted from the cathode. These pressure-resistant supports 30 are 1
For example, it is formed by depositing an electrode thin film of aluminum, silver, etc. on the surface of an insulating plate such as glass, and applies electric potentials of different polarities to adjacent electrode thin films to provide an electron beam deflection effect. The protruding pins 32 are in direct contact with the phosphor 24 of the front substrate 12 for the purpose of reducing the weight of the panel and preventing it from being crushed.

(Problems to be Solved by the Invention) However, this prior art flat cathode ray display device suffers from thermal expansion and contraction (thus, ms anode 22 and the phosphor 24 formed of a thin film and powder, that is, the phosphor display means 26, receive concentrated pressure from the protruding pin 32, and are destroyed in spots.Therefore, the anode 22 and the phosphor 24 are Because it peels off partially, a phenomenon occurs in which pixels do not emit light in these areas.Furthermore, the front substrate 12 and the back substrate 14 are distorted by the exhaust pressure during vacuum processing, and extremely high pressure is generated especially in the center of the panel. As a result, the front substrate 12 cracks, and attempts have been made to increase the thickness of the front substrate 12 to absorb the stress, but this has the disadvantage of preventing the device from being made thinner and increasing its weight.

Further, in the pressure-resistant support means of the prior art, the pressure-resistant support 30 in the form of a flat plate electrode is made of a conductive metal or formed by coating an insulating plate with a conductive metal to prevent charge-up and discharge. and is directly or indirectly connected to the anode. However, thermal expansion during the subsequent degassing treatment at high temperatures may result in poor contact between the pressure-resistant support 30 and the anode 22 or cause discharge, resulting in uneven brightness due to poor conductivity.

It is an object of the present invention to provide a flat cathode ray which avoids the above-mentioned drawbacks and which does not cause the phenomenon of pixel loss due to spot destruction of the one-light emitting display means and which does not cause uneven brightness due to poor contact of the pressure-resistant support. The purpose of this invention is to provide a display device.

[Means to solve the problem]

In order to solve the above problems, the present invention comprises an envelope, an electrode structure disposed within the envelope, and a phosphor provided integrally with an anode on the front substrate of the envelope. In a flat cathode ray display device, the pressure-resistant support means has an opening exposing the display area of the phosphor and is a conductive member that directly contacts the anode. Provided is a flat cathode ray display device comprising a stress dispersion member, wherein the pressure support is engaged with the front substrate while electrically contacting the anode through the conductive stress dispersion member. It is.

(Function) In this way, when the plurality of pressure-resistant supports of the pressure-resistant support means are in contact with the anode through the conductive stress dispersion member, the pressure from the pressure-resistant supports is reduced due to the stress dispersion effect of the conductive stress dispersion member. The anode and the phosphor, which are dispersed and used as a fluorescent display means, are not destroyed in a spot, so pixel defects do not occur. Since they are in contact over a wide area, contact failure will not occur even if they are placed in a high temperature atmosphere during processing, and uneven brightness will not occur.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a flat cathode ray display device 10 according to the present invention.
Similar to prior art devices, this flat cathode ray display device 10 includes an envelope 18 that includes a front substrate 12, a back substrate 14, and side walls 16, and is disposed within the envelope 18 and emits an electron beam. It consists of an electrode structure 20 including a cathode that generates the electron beam and a control electrode that controls, focuses, and deflects the amount of the electron beam, and a phosphor 24 that is integrated with the anode 22 on the front substrate 12. It consists of a fluorescent display means 26 that emits light upon collision with the fluorescent display means 26, and a pressure-resistant support means 28 that supports the inside of the envelope 18 against pressure. Incidentally, the envelope 18 has an exhaust pipe (not shown) for evacuating the inside, and this exhaust pipe incorporates the electrode structure 20, the fluorescent display means 26, and the pressure-resistant support means 28 in the envelope 18, and connects the parts to each other. After being fixed to each other by a sealing means such as frit glass, the inside is evacuated by a vacuum evacuation means (not shown) and used for vacuum treatment.

The pressure-resistant support means 28, as shown in FIGS. 2 and 3,
A lattice frame-shaped conductive stress dispersion member 34 that has an opening 34a that exposes the display area of the phosphor 24 and is in electrical contact with the anode 22, and the conductive stress dispersion member 34 and the electrode structure 20.
and a plurality of bottle-shaped pressure-resistant supports 36 that are arranged between the container 18 and support the inside of the envelope 18 with pressure resistance.

The conductive stress dispersion member 34 is formed of a thin metal plate having a predetermined rigidity or a thin insulating plate having a conductive coating.

It is preferable that the front substrate 12 has a black matrix film that prevents external light such as sunlight and illumination lights from being reflected by the phosphor 24 and reducing the contrast of the image.

Such a black matrix film can be provided directly on the front substrate 12, but at least on the front substrate 12 side of the conductive stress dispersion member 34, a black conductive film such as carbon or graphite that is chemically stable in a high temperature atmosphere may be used. By performing a blackening treatment to form a black matrix on the surface, the conductive stress dispersion member 34 has the function of a black matrix film, prevents the occurrence of rust during storage of parts during assembly of the device, improves heat dissipation, and can be used for electron beams. It is preferable to reduce the temperature rise due to

The conductive stress dispersion member 34 can be directly electrically and mechanically contacted on the i-pole 22, or formed on the front substrate 12 so as to straddle the conductive stress dispersion member 34 and the phosphor 24. Electrical contact can be made to the anode 22 by either of the methods of forming the anode 22 by applying a metal back.

Next, an example of a method for manufacturing the fluorescent display means 26 and the pressure-resistant support means 28 will be described with reference to FIG. 1, except for the place on which the conductive stress spreading member 34 and the side wall 16 are installed.
A phosphor 24 is formed with a thickness of about 1.5 mm (see FIG. 3(A)). This phosphor 24 is, for example, a phosphor formed by dispersing a fluorescent material in a photosensitive material such as polyvinyl alcohol. After applying the slurry by a coater method, it can be exposed to light by an exposure method and can be formed through a development process.

Next, by coating means such as spraying using a mask, the organic resin is spread on the outer surface of the phosphor particles in the outermost layer of the phosphor 24 to form a thin organic fi 24 a, and the phosphor is coated with the phosphor. In addition to flattening the phosphor 24, the phosphor 24 is provided with good reflection efficiency and high brightness. This organic l!
ji 24 a.

For example, after wetting the outer surface of the phosphor 24 with water spray, a lacquer solution obtained by dissolving isobutyl methacrylate resin in a solvent such as toluene or ethyl acetate is printed using a stainless steel mesh (mesh size #2000). (See FIG. 3(B)).

The rod-shaped conductive stress dispersion member 34 is made of a conductive metal plate or an insulating plate coated with a conductive coating.
Made from 426 alloy thin plate with a thickness of 0.5 to several mm, opening 34
A is formed by etching, punching, etc. corresponding to each deflection area (display area). This conductive stress dispersion member 34 is subjected to a blackening treatment by attaching carbon to its surface by a sputtering method. Note that this sputtering method is performed at 20 mT so that the surface of the conductive stress dispersion member 34 becomes sufficiently black.

The film thickness of this black treatment is assumed to be 800. The conductive stress dispersion member 34 is bonded to the surface of the front substrate 12 so that the black-treated surface faces the front substrate 12 so that the phosphor 24 is exposed through the opening 34a, and the frit glass is attached to the edge thereof. After fixing the phosphor 24 and the conductive stress dispersion member 3
The anode 22 of the conductive film that is electrically connected to the conductive stress dispersion member 34 is formed by metal backing the anode 22 of the conductive film across the conductive film 4 (see FIG. 3(C)). 22
is formed by vacuum evaporating aluminum to a thickness of, for example, 3000 mm.

When the pressure-resistant supports 36 are pin-shaped, the ends of the conductive stress dispersion members 34 are engaged with the intersections of the frames in order to position these pressure-resistant supports 36, as shown in FIG. It is preferable to provide a through or non-through insertion hole 34b for insertion.

In the above embodiment, the pressure support 36 is the electrode structure 20.
These pressure-resistant supports 36 are engaged with the lower surface of the
penetrate the electrode structure 20 and engage with the back substrate 14, or
Alternatively, the conductive stress dispersion member 34 may be engaged with a fixing member provided between the back substrate 14 and the electrode structure 20. Also, the conductive stress dispersion member 34 may have a stripe shape or a mesh shape instead of a frame shape. Alternatively, a black matrix layer may be formed on the anode 22 using a black conductive material such as graphite, and the conductive stress dispersion member 34 may be placed on this black matrix layer.

Next, as a comparative example, the 8-inch panel display device (A) formed according to the above embodiment of the present invention and the pressure-resistant support were directly fixed onto the front substrate without providing the conductive stress dispersion member 34. An experiment was conducted to compare the display characteristics with an 8-inch panel display device (B).In this experiment, a 426 alloy plate with a thickness of 0.2 mm was used as the conductive stress dispersion member, and the pressure support was The insertion hole to be inserted has a diameter of 0.
5mm non-penetrating form.

The dimensions of the opening are 10mm x lOmm, and the width of the frame is 1mm.
And so. In addition, the pressure support has a diameter of 0.5 mm and a length of 6 mm.
The pin was made of 5mm US304 alloy. In this experiment, in the display device 21 (A) of the present invention, stress is dispersed by the conductive stress dispersion member, so that the pressure received from the pressure-resistant support is concentrated when the panel is evacuated or during degassing treatment at high temperatures. Therefore, no pixel chipping or cracking of the front substrate occurred at all, as compared to the comparative display device (B).
), pixel chipping occurs, and cracks on the front board occur, approximately 10%
It has been confirmed that this has occurred.

Furthermore, the display device of the comparative example! In (B), the pressure-resistant support causes contact failure with the aluminum back layer, which is the anode, due to thermal expansion during degassing treatment at high temperatures after assembly, and the probability of discharge reaching 30%. As a result, brightness unevenness occurred by about 20%. On the other hand, in the display device (A) of the present invention, this phenomenon was not observed at all.

In the structure of the comparative example, the above-mentioned drawbacks were also solved by making the thickness of the front substrate 8 mm or more, but this increased the weight of the device by 300 g or more, which is not preferable for increasing the screen size.

(Effects of the Invention) According to the present invention, as described above, since the anode is in contact with the anode through the pressure-resistant support or the conductive stress dispersion member, the anode and the phosphor are not destroyed in spots. Therefore, pixel defects will not occur, and since the pressure-resistant support is in contact with the anode through this conductive stress dispersion member, contact failure will not occur even in high-temperature atmospheres, and brightness unevenness will not occur. will not occur.

[Brief explanation of drawings]

1 and 2 are a sectional view and an enlarged exploded perspective view of a flat cathode ray display device according to the present invention, and FIGS. 3(A) to 3(C) are a fluorescent display means and a pressure-resistant support means, which are the main parts of the present invention. 4 is an enlarged perspective view of a part of the conductive stress dispersion member used in the present invention, and FIGS. 5 and 6 are cross-sectional views showing an example of the manufacturing process of the conventional flat cathode ray display device. A sectional view, an enlarged exploded perspective view, and FIG. 7 are explanatory views of the operation of the conventional device. 10----One plane cathode ray display device, 12----One front substrate, 14---One back substrate, 16---Side wall, 18---One envelope, 20-- --One electrode structure,
22---one anode, 24---one phosphor, 26---
--- Fluorescent display means, 28 --- - Pressure-resistant support means, 3
4-1111 conductive stress dispersion member, 34a---m-opening, 36---pressure-resistant support. Figure 1-12 Figure 4 Figure 6 O Procedural amendment (spontaneous) May 17, 1990 Director-General of the License Agency Kichi 1) Number of sentences, Case Indication Patent Application No. 1-219697 No. 2 9. Name of the invention: Flat cathode ray display device, relationship with the person making the amendment Patent applicant (529) Furukawa Electric Co., Ltd. - 1 Agent Room 302, Nihonbashi Chuo Building, 4-12-11 Nihonbashi Honmachi, Chuo-ku, Tokyo Te1. 669-7395 (6446) Patent Attorney Kikunoya Arata-'1, (Section 1□, In the "Detailed Description of the Invention" column of the specification subject to the amendment, the content J of the amendment is corrected to "Agitation 200."that's all

Claims (1)

[Claims] an envelope, an electrode structure disposed within the envelope, a fluorescent display unit comprising a phosphor integrally provided on an anode on a front substrate of the envelope; In a flat cathode ray display device, the pressure-resistant support means includes a plurality of pressure-resistant supports that provide pressure-resistant support, and the pressure-resistant support means has an opening that exposes the display area of the phosphor and is a conductive member that directly contacts the anode. The pressure-resistant support includes a stress dispersion member,
A flat cathode ray display device, wherein the flat cathode ray display device is engaged with the front substrate while electrically contacting the anode through the conductive stress dispersion member.