JPH0364840A - Plane cathode-ray picture display device - Google Patents

Abstract

PURPOSE:To enable pressure support of an electrode structure without damaging an anode and a face board by containing conductive pins fixed by upper and lower conductive supporting members. CONSTITUTION:An electrode structure 28 has an insulating electrode board 42 on which a cathode 24 and a control electrode 26 are installed. A pressure supporting means 40 is made up with conductive pins 48 which are fixed by a conductive lower-part supporting member 44 in contact with an anode 12 and an insulating upper-part supporting member 46 installed between the electrode structure 28 and a backing board 18. For example, the lower-part supporting member 44 is made from 426 alloy thin plate with the thickness being 0.05-1mm, and the upper-part supporting member 46 is made of insulating material such as glass with the thickness being 1-3mm. It is thus possible to pressure-support the electrode structure 28 without damaging the anode 12 and a face board 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flat cathode ray image display device used for displaying graphics, and particularly to improvements in pressure-resistant support means for supporting an electrode structure. be.

(Prior Art) Cathode ray image display devices such as flat CRTs and fluorescent display tubes are
In order to prevent the panel from being crushed by atmospheric pressure, which is a warning from flat-type cathode ray tubes, the thickness of the side walls, especially the front and back substrates that have the flat fluorescent display screen, is increased. However, this approach had the drawback of making the panel heavier and thicker.

In order to eliminate these drawbacks, various flat cathode ray image display devices having pressure-resistant support means have been proposed.

In one conventional technique, the pressure-resistant support means is separated from a flat plate-shaped pressure-resistant support member made of an insulator such as glass, and these support members are arranged so that their plate surfaces are vertical planes so that they can stand alone. SID DIGES is used orthogonal to each other in a lattice shape through incisions (for example, SID DIGES
T 1980, page 26 and JP-A-61-16354
(See Publication No. 0).

FIGS. 1O and 11 show an example of a pressure-resistant support means using a flat support member alone.

This prior art display panel includes a vacuum vessel 22 including a front substrate 16 having a phosphor 14 integrated with an anode 12, a back substrate 18, and a side wall 20, and a vacuum vessel 22 disposed within the vacuum vessel 22 to emit an electron beam. It consists of an electrode structure 28 including a generated cathode and a control electrode that controls, focuses, and deflects the amount of the electron beam, and a pressure-resistant support means 40 that supports the electrode structure 28 with pressure. The pressure-resistant support means 40 consists of a plurality of strip-shaped (flat plate-shaped) pressure-resistant support members 34 attached to the front substrate 16 via positioning members 32. This pressure-resistant support member 34 is shown in FIG. 12(A).
As shown in (B), acceleration electrodes 36 or deflection electrodes 3B made of a conductive thin film of aluminum, nickel, silver, etc. may be provided on both surfaces. Accelerating electrode 36 is F! ! A high voltage similar to that of the J pole is applied to form an accelerating electric field that sharply accelerates the electron beam extracted, focused, and deflected by the electrode structure 28 near the anode 12, and the deflection electrode 38
The electron beams are deflected appropriately by applying different voltages to each.

[Problem to be solved by the invention]

However, this planar am image display device has several problems, and these problems will be discussed below.

(1) One of the problems is that the flat support member 34 of the conventional display device is prone to buckling cracks.

If the support member 34 is flat, its rigidity is low;
When the panel is evacuated, the center of the support member 34 is deformed,
There is a risk of buckling or cracking. Therefore, the equipotential surface near the support member 34 is disturbed by the potential applied to the electrodes 36 and 38 provided on the surface of the cathode 24, so that the electrons emitted from the cathode 24 do not hit a predetermined point on the phosphor. There was a drawback that it resulted in a false landing.

In order to prevent this and obtain a predetermined resolution, as shown in FIG.
If only the portion 34a that corresponds to 2 is made thin and has a sharp tip, the load will be concentrated on this sharp tip and the front board 16 will easily break. If the stress is to be applied to the positioning member 32, the stress will be concentrated directly under the positioning member 32, and there is a problem in that the wall thickness of this portion must be increased.

(2) Furthermore, the display device of the prior art has a drawback of decreasing the deflection sensitivity of the electron beam.

In a panel that scans a wide display area by deflecting an electron beam, the electron beam ends up being swung left and right on the phosphor. When accelerating electrodes 36 are provided on adjacent supporting members 34 that sandwich a certain display area, the voltage applied to the anode 12 is applied to the accelerating electrodes 36 via a series resistor, so that the equipotential surface e is Figure 12 (
As shown in A), since it is formed parallel to the surface of the anode 12, it is necessary to apply different potentials to the left and right deflection electrodes 38 of the electrode structure 28 to make the equipotential surface uneven on the left and right sides. Therefore, the accelerating electrode 36 tends to flatten the equipotential surface e, which has the drawback of lowering the deflection sensitivity.

In order to prevent this, as shown in FIG. 12(B),
When the deflection electrode 38 is provided on the support member 34, the electrons emitted from the cathode are located in a range close to the anode 12 and have extremely high energy.

To deflect this, it is necessary to apply a deflection voltage of several hundred to several tens of kilovolts to the deflection electrode 38, which is the same as that applied to the anode 12, but in order to output such a high voltage as a pulse, Requires expensive output circuitry.

When the support member 34 is not provided with an electrode, the support member 34
Since it is an insulating material, its surface is charged with electrons or ions upon impact with the anode, making it impossible to practically control the potential distribution around the support member.

In the above description, the deflection direction is set to the left-right direction, but this is for convenience of explanation, and it goes without saying that the direction is not limited to this. Also, if the support member 34 is made of metal, the anode 12 and the support When the member 34 is electrically conductive, the equipotential surface near the anode 12 is distributed downward in a U-shape in the area surrounded by the anode 12 and the support member 34, and therefore electrons that are perpendicularly incident on the equipotential surface e are directed to the anode 12. In addition, the efficiency of the electron beam decreases, and the emitted electron beam cannot land accurately at a predetermined point, so the support member 34 is made of an insulating material. required to make.

(3) The material of the support member 34 is expensive and the assembly work is troublesome.

Since the electron beam emitted from the cathode and deflected is governed by an equipotential surface determined by the potential of the anode 12 and the potential of the electrode on the support member 34, this equipotential surface is required to be uniform, and However, if this is non-uniform, the electron beam cannot scan a predetermined point, so the support member 34 is erected completely perpendicular to the anode 12.
In addition, it is required that the surface be free from undulations. However, in the support means 40 of the prior art, since the support member 34 is plate-shaped, each part of the electrode undergoes thermal expansion due to the compressive stress received from above and below during evacuation and the temperature during baking and sealing of the vacuum container 22. The supporting member 34 tends to deform and disturb the equipotential surface around the anode 12. Therefore, in the support means 40 of the prior art, the support member 34 is made of a material such as high-rigidity high-melting glass or alumina with a high sintering temperature, and its surface needs to be polished, so the material cost is high. Moreover, since the assembly requires very high precision, there is a drawback that the number of work is large and the assembly is expensive.

(4) There was a drawback that the electric potential distribution was distorted due to the charging of the support member 34.

As already mentioned, the support member 34 is an insulator and has an electrode (acceleration electrode or deflection electrode) to which a potential is applied to its surface, so the surface of the portion of the support member 34 that contacts the anode 12 is not supported. It must be insulative to prevent short circuits with the electrodes on the member 34; however, if such insulator is exposed on the surface of the support member 34, this portion will be charged with electrons and ions, and thus the anode A large strain is imparted to the equipotential surface at the interface between the support member 12 and the support member 34, and the electron beam incident near this area cannot reach a predetermined position, resulting in a disadvantage that the image is distorted.

(5) There was a drawback that creeping discharge damage easily occurred between the anode 12 and the electrode on the support member 34.

It is desirable that the interface between the anode 12 and the support member 34 be as close as possible, but since the voltage applied to the anode 12 is usually several hundred volts to several tens of kilovolts, if the distance between the two is reduced, the anode 12 and the electrodes 36, 38 on the support member 34, creeping discharge damage may occur. For this reason, it is extremely difficult to reduce the length of the exposed portion of the insulator of the support member 34 to 1 mm or less, and therefore, as described above, the irregular portion of the equipotential surface that occurs due to the charging phenomenon of electrons or ions is This irregular portion varies depending on the voltage applied to each electrode, but can be seen over a section of several mm from the boundary between the support member 34 and the anode 12, and such a long irregular portion is critical to the display quality of the image. It becomes a defect. To prevent this,
As shown in FIG. 11, a protrusion 34 is provided on the lower edge of the support member 34.
a is provided to partially space the anode 12 to reduce the charged area, but this is because the load on the panel is received at a point and the load is concentrated locally. There is a problem that the anode 12 may be damaged due to cracking or thermal expansion during degassing treatment under high temperature and pressure during evacuation of the vacuum container 20.

(6) There was a drawback that degassing treatment from the surface of the support member 34 was difficult.

In cathode ray display tubes such as flat CRTs and fluorescent display tubes, water vapor adsorbed on the glass and metal parts that make up the panel is removed by means such as high-frequency heating after each part is assembled.
It is common practice to remove gases such as oxygen.

In this case, these parts are required to have as small a surface area as possible in order to be able to degas efficiently, but the plate-shaped support member 34 has a large surface area and is extremely difficult to degas. there were.

(7) Finally, it was difficult to support the support member 34 against the anode 12 so that it would not fall.

In order to equalize the equipotential surface around the anode 12, the support member 34 must be supported perpendicularly to the anode 12. In the prior art, the support member 34 can be accurately positioned on the anode 12 side by the positioning member 36, but the support member 34 cannot be provided on the electrode structure 28 side to avoid changes in potential distribution. It was difficult to hold the 34 vertically, and it had the disadvantage that it easily fell over.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flat cathode ray image display device that avoids the above-mentioned drawbacks and can support an electrode structure withstand pressure without damaging the anode front substrate or impairing display characteristics. It is in.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a vacuum container including a front substrate, a back substrate, and a side wall arranged at intervals, a cathode and an anode arranged in the vacuum container, and a control panel. an electrode structure that controls an electron beam generated from a cathode; a fluorescent display means that includes a phosphor integrated with an anode on a front substrate and emits light when the electron beam collides with the electrode structure; In a flat cathode ray image display device, the voltage-resistant support means includes a conductive lower support member that contacts the surface of the anode, and an insulating upper support member that is provided between the electrode structure and the back substrate. The present invention provides a flat cathode ray image display device comprising a plurality of conductive pins fixed by a support member.

(Function) If the conductive pins are fixed by the upper and lower conductive support members in this manner, the rigidity of the support means will be increased, and the load will not be concentrated on the anode and front substrate, causing damage to them. Furthermore, the material cost of the support means is low, assembly is easy, and high display characteristics can be obtained without disturbing the potential distribution.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a flat cathode ray image display device 10 according to the present invention, and this flat cathode ray image display device 10 includes a front substrate 16 and a front substrate 16. Vacuum container 2 including back substrate 18 and side wall 20
2, an electrode structure 28 that includes a cathode 24 disposed within the vacuum vessel 22 to generate an electron beam, and a control electrode 26 that controls, focuses, and deflects the electron beam; phosphor 14 provided integrally with the anode 12 of
It consists of a fluorescent display means 30 that emits light upon collision with an electron beam, and a pressure-resistant/supporting means 40 that supports the electrode structure 28 with pressure.

As can be seen from FIG. 2, the electrode structure 28 has an insulating electrode substrate 42 on which the cathode 24 and control electrode 26 are provided. Note that the control electrode 26 includes a focusing/deflecting electrode 26A and a signal electrode 26B.

The pressure-resistant support means 40 includes a plurality of conductive pins fixed by a conductive lower support member 44 in contact with the anode 12 and an insulating upper support member 46 provided between the electrode structure 28 and the back substrate 18. I have been admonishing this since I was 48.

The conductive lower support member 44 is made of a conductive material or an insulating material with a conductive coating and has a wall thickness of, for example, 0.05 to 1 mm, as shown in FIGS. 3 and 4A. It is made from sheet metal alloy and has one opening 44a for each deflection area formed by etching or stamping. Furthermore, a concentric protrusion 50 for lower support is provided by half-etching at the intersection around the opening 44a. This protrusion 44 is in the form of a through hole. Furthermore, Figure 4 (
As shown in B), the lower support member 4 corresponds to the protrusion 50.
A stress receiving portion 50a may be provided so that the entire portion 4 is floated.

As shown in FIGS. 5A and 5B, the upper support member 46 is made of an insulating material such as glass with a thickness of 1 to 3 mm, and the upper support member 46 corresponds to the conductive pin 48. Through hole 46 having a diameter larger than the diameter of the lever pin
It has a striped groove 52 provided with a
The striped support piece 54 is made of 426 alloy and has a through hole 54a aligned with the through hole 46a, and has a thickness of 0.5 to 3 mm, and is further made of an insulating material such as glass or a metal material disposed thereon. A striped lid piece 56 is fitted thereto.

In addition, as shown in FIG. 5(C), without providing a groove in the upper support member 46, the striped support piece 54 is pasted to the upper support member 46 using a sealing material such as frit glass, or A pressure-resistant support piece 58 made of glass or the like may be provided on the upper support member 46 between adjacent support pieces 54 .

As shown in FIG. 6(A), the conductive pin 48 is a conductive cylindrical body 60 made of, for example, stainless steel and having an outer diameter of 0.61 mm to 1 mm.
For example, frit glass, alumina, or
It has a cylindrical coating 62 in which an insulating material such as silica or a resistor made of such insulating material mixed with a conductive material such as silver, nickel, carbon, etc. is uniformly applied and sintered. The conductive pin 48 is inserted between the upper and lower support members 44, 46 such that the lower end surface of the sheath 62 engages with the protrusion 50 of the lower support member 44, and the upper end surface engages with the upper support member 46. Fixed. Note that this coating 62 may be cut off from the upper cylindrical portion 62a and the lower inverted conical portion 62b, as shown in FIG. 6(B), in which case the lower inverted conical portion 6
The upper end surface of 2b engages with the upper support member 46. Further, as shown in FIG. 6(C), the covering 62 includes a lower inverted conical portion 62c made of a resistive material and an upper cylindrical portion made of an insulating material, which is provided so as to be continuous with the outer periphery thereof. 62d.

Further, the covering 62 of the conductive pin 48 can be made into any shape such as a prism, as long as it can withstand compressive load and has pressure-resistant support strength even if the cross section on the anode 12 side is small. .

For example, both ends of the conductive cylindrical body 60 may be the same as the outer diameter of the coating 62, or may be continuous so that the outer diameters of the cylindrical body 60 and the coating 62 change smoothly.

The method of assembling the image display device of the present invention will be described in detail with reference to FIG. First, as shown in FIG. 7(A), align the positioning markings (not shown) between the lower support member 44 and the positioning jig 64 indicated by dotted lines on the lower support member 44 to position them. The electrode structure 28 and the upper support member 46 were assembled thereon in a separate process in advance.
and are mounted while aligning using positioning marks, and temporarily fixed using a positioning bin (not shown) provided outside the display screen.The through hole of the upper support member 46 of the assembly temporarily fixed in this way The upper end of the conductive pin 48 is inserted into 46a, 56a, and the conductive pin 48 is fixed to the upper support member 46 by appropriate fixing means such as laser welding, micro spot welding, and inert gas arc welding. Note that if the upper support member 46 and the support piece 54 are engaged without a gap, cracks may occur in the upper support member 46, so in order to prevent this, a stress reliever such as a glass cloth is placed between the two. It is preferable to sandwich the material. Incidentally, the coating 62 of the conductive pin 48 at least covers the Mw'a' pole 26 for focusing and deflection.
A maximum 6A In the drift region where the electron beam is deflected and proceeds, the surface of the conductive pin 48 is such that the coating 62 of the resistor or the conductor itself is exposed.

Next, while the assembly to which the conductive pins 48 are fixed in this manner and the positioning jig 64 are integrated, the lower support member 44 is applied to the lower part of the assembly and the upper support member 46 is fixed. This is integrated by means of fixing. Finally, remove the positioning pin 64, and as shown in FIG. 7(B), align the positioning mark (not shown) provided on the front board 16 with the positioning mark provided on the lower support member 44 of the assembly. The end of the lower support member 44 and the front substrate 16 are integrated with a sealing material such as frit glass, and then the side walls 20 and the back substrate 18 are assembled.
The device is completed by performing evacuation, aging, and getter treatment to bring the inside to a predetermined vacuum state.

The image display device (panel) thus obtained can avoid the drawbacks of the prior art as follows.

First, since the voltage-resistant support means 40 is made up of a plurality of conductive pins, the area around the deflected electron beam is a vacuum space, so unlike the conventional case, charging of electrons or ions does not occur. Although some disturbance of the equipotential surface around the magnetic pin 48 is unavoidable, the anode 1 where the electric field changes the most
The interface between the conductive pin 48 and the anode 12 is electrically conductive and has the same potential as the anode 12, and the disturbance in the electric field is an effect of the thickness of the lower support member 44 and does not pose a practical problem. In addition, the conductive pin 48
The coating 62 of the resistor around the resistor gradually changes the potential gradient from the cathode 24 to the anode 12, and in actual use, the potential can be made close to an equipotential surface, so that the electron beam can be landed at a predetermined position. I can do it. Note that if the resistance value of the coating 62 is lower than 10-'Ωcm, an equipotential surface that is the same as the potential of the anode 12 is created around the conductive pin 48, and the electron beam is deflected to the maximum in the deflection region. It is empirically known that it can invade adjacent areas.
Therefore, the resistance value is required to be 10-10 cm or more, but if the resistance value is 106 Ωcm or more, the electron beam will not land at the specified position due to the charging effect, so it should be in the range of 10 Ωcm mz l O'Ωcm. Whether the conductive pin 48 is coated with a resistor or exposed is determined by the required dimensions and definition of the display panel; for example, in the case of a panel used at an observation distance of several meters. Since spot-like non-uniformity is practically invisible in the case of a panel, the conductor may be exposed, but in the case of a panel with a short viewing distance, it is required to cover the resistor.

Further, in the pressure-resistant support means 40 of the present invention, since the anode 12 and the conductive pin 48 are electrically connected, the potential of the anode 12 basically penetrates through the electrode structure 28 and reaches the back substrate 48.
However, in a cathode ray image display device that deflects an electron beam, the cathodes 24 are arranged at a pitch corresponding to a length corresponding to the deflection distance, for example, 20 mm. No discharge breakdown will occur between the electrodes.

Furthermore, ``Since the conductive pin 48 has an extremely small cross-sectional area, the influence of the conductive pin 48 on the equipotential surface in the vicinity of the anode 12 is extremely small, and therefore, it can be seen that the accuracy of its installation may be rough; Since the conductive pin 48 penetrates through the lower support member 44 and the electrode structure 28, the mutual spacing can be increased, which reduces installation errors and improves perpendicularity, so that the pressure-resistant support means 40 can be obtained economically.

When the verticality of the pressure-resistant support means 40 is improved in this way, atmospheric pressure is applied perpendicularly to the conductive pin 48, and as shown in FIG. 54 (there is no buckling because the conductive pin 48 is applied uniformly. In particular, the conductive pin 48 has a composite structure in which the coating 62 is formed, or the cylindrical body 60 of the conductive pin 48 is metal and the coating 62 is glass, so that it does not buckle during sintering. The radial compressive stress caused by the thermal contraction of the glass significantly increases the strength compared to a simple pin.

Furthermore, since the conductive pin 48 is connected to the upper and lower supporting members 44 and 46, stress is not concentrated on the ends of the conductive pin 48, and therefore no cracking occurs. Since the surface area is small, getter processing becomes easy.

Since the height of the lower support member 46 can be appropriately adjusted by the support piece 54 and the lid piece 56, it is possible to obtain a panel with an overall uniform thickness. Therefore, when the vacuum container 22 is assembled or evacuated, only a portion of the vacuum container 22 is not pressurized and implodes. Further, as shown in FIG. 8, it is preferable that the lower support member 44 is formed of a matrix-shaped frame, since the electron beams in the respective deflection regions do not overlap.

Next, a specific example of the flat cathode ray image display device of the present invention will be described. The spacing between the cathode and the anode is 10 mm, and the cathode is
0ILm diameter tungsten wire (Ba, Sr, Ca
)O and the vertical deflection electrode has a thickness of 1 mm.
, is made of 5US304 with a width of 3 mm, and an inclined surface with a horizontal length of 1 mm is formed at the opposite end.

In addition, the vertical control (focusing) electrode has a thickness of 0.5 mm and a radius of 3 m.
The horizontal control (focusing) electrode is made of 5US304 with a thickness of 3000 m and 1 m as the base layer on a glass substrate.
On top of that, nickel was deposited with the same thickness of <3000 m and width of 1 mm. The distance between adjacent vertical deflection electrodes is 5 mm, and the distance between the vertical deflection electrode and the back substrate is 0.
．． The distance between them was set at 1 mm, and a frit glass was used as a spacer to fix each other, and the vertical deflection distance was set at 20 mm.

Further, the conductive pin was made from a stainless steel wire having dimensions as shown in FIG. 9, and the covering was a glass insulator on the upper part and a nickel paste having a resistance value of 10'Ωcm on the lower part.

The upper and lower support members have a through hole with a diameter of 0.5 mm.
It was 2 mm thick 426 alloy and the support piece was 1 mm thick glass with a 0.5 mm diameter through hole. still,
The voltage applied to the anode was 2 kV.

(Effects of the Invention) According to the present invention, as described above, since the conductive pins are separated from the plurality of conductive pins fixed by the upper and lower supporting members, the rigidity of the supporting means is increased, and the anode and front substrate are Since the load is not concentrated, there is no damage to these components, and there is a practical benefit in that high display characteristics can be obtained without disturbing the potential distribution. Furthermore, the material cost of the supporting means is low and it is easy to assemble, and since the conductive pin has a small cross-sectional area, degassing treatment after assembly is easy, so that the device can be provided at a low cost.

[Brief explanation of drawings]

1 and 2 are a sectional view and an exploded perspective view, respectively, of a flat cathode ray image display device according to the present invention, FIG. 3 is an enlarged perspective view of a part of the lower support member used in the present invention, and FIG.
A) and (B) are partial sectional views of different examples of the lower support member used in the present invention, respectively, and Fig. 5 (A), (B), and (C)
6(A), 6(B), and 6(C) are enlarged perspective views of different examples of the conductive pin used in the present invention, respectively. 7(A) and 7(B) are sectional views sequentially showing the assembled state of the device of the present invention, FIG. 8 is an enlarged sectional view of the main parts of the device of the present invention, and FIG. 9 is a specific example of the present invention. FIG. 10 is a sectional view of a conventional flat cathode ray image display device, FIG. 11 is an enlarged exploded perspective view of the pressure-resistant support means of the device in FIG. 10, and FIG. Diagram (A)
(B) is an explanatory diagram showing different states of equipotential surfaces within the deflection region of the devices of the prior art; 10--1--Planar cathode ray image display device, 12--11-1 anode, 14-----phosphor, 16-----front substrate, 18-----1 back substrate, 20-- --One side wall, 2
2-----One vacuum container, 24----One cathode, 26--
---Control electrode, 28--One electrode structure, 30--
--- one fluorescent display means, 40 --- one pressure-resistant support means, 4
4----- Conductive lower support member, 46-- Insulating upper support member, 48-- Conductive pin. Figure 7 Figure 41.4 Figure O Figure 2 Ishichi No. 11 K 2 Figure 12 Procedural amendment voluntarily) May 17, 1990

Claims (1)

[Claims] A vacuum container including a front substrate, a back substrate, and a side wall arranged at intervals from each other, and a cathode, an anode, and a control electrode arranged in the vacuum container, and controlling an electron beam generated from the cathode. A flat surface comprising an electrode structure, a fluorescent display means that includes a phosphor and is integrally provided on an anode on the front substrate and emits light upon collision with an electron beam, and a pressure-resistant support means that supports the electrode structure. In the cathode ray image display device, the pressure-resistant support means includes a plurality of conductive conductors fixed by a conductive lower support member in contact with the anode and an insulating upper support member provided between the electrode structure and the back substrate. A flat cathode ray image display device comprising a pin.