JP3062023B2 - Vacuum envelope and image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

True This invention relates, is provided a television, the image display device and to a display device such as a computer
For air envelopes .

[0002]

2. Description of the Related Art There are a self-luminous type flat panel image display device using a plasma display, an EL display device, and an electron beam, and there is an increasing demand for a large screen and high definition in any of them. Among these devices, as a device using an electron beam, for example, a thin image display device disclosed in Japanese Patent Application Laid-Open No. 2-299136 is known. The device disclosed in this publication has a configuration in which a surface conduction electron-emitting device is arranged as an electron source for generating an electron beam in a vacuum envelope composed of a face plate, a substrate, and an outer frame. The electron beam emitted from the conduction electron-emitting device is accelerated to irradiate a phosphor formed on the face plate to emit light, thereby displaying an image. Hereinafter, the configuration of the thin image display device will be described in detail.

FIG. 7 is a partial sectional view of a flat panel display using the surface conduction electron-emitting device disclosed in the above publication.

In FIG. 7, reference numeral 801 denotes a substrate made of an insulating material such as soda glass; 802, a surface conduction electron-emitting device; 803, an atmospheric pressure support member made of photosensitive glass;
Reference numeral 04 denotes a face plate made of soda glass having a phosphor 805 covered with a metal back 806 of an aluminum thin film inside the panel, reference numeral 807 denotes frit glass, and reference numeral 808 denotes an outer frame.

[0005] The substrate 801 and the face plate 804 are supported at predetermined intervals by an atmospheric pressure support member 803, and a vacuum envelope is formed by these and the outer frame 808. The vacuum envelope is evacuated by an external vacuum pump through an exhaust pipe attached to a predetermined portion of the vacuum envelope (not shown), it has become a predetermined one of the vacuum pressure. Note that the substrate 801 and the face plate 804 are supported by the atmospheric pressure support member 803, whereby the distortion of the face plate 804 and the like due to the atmospheric pressure is reduced when a large number of elements are arranged and formed over a large area. .

The surface conduction electron-emitting device 802 is connected to an external drive circuit (not shown), and the metal back 806 is connected to a high-voltage power supply via a high-voltage cable.

FIG. 8 is a partially enlarged view showing a schematic configuration of the surface conduction electron-emitting device 802 shown in FIG.

In FIG. 8, reference numerals 902 and 903 denote device electrodes provided at regular intervals (about 2 microns).
Reference numeral 4 denotes a thin film formed by applying organic Pd (CCP4230 manufactured by Okuno Pharmaceutical Co., Ltd.), and reference numeral 905 denotes an electron-emitting portion formed on the thin film 904 by an energization process called forming.

Here, the term "forming" refers to the element electrode 90.
2, a voltage is applied between the thin films 904 to locally destroy, deform, or alter the thin film 904, thereby forming a portion of the thin film 904 that is in an electrically high-resistance state. The part which becomes a high resistance state is the electron emitting part 9
05. In addition, as the electron emitting portion 905, the thin film 9
In some cases, cracks generated in a part of 04 may be used. In this case, electrons are emitted from the vicinity of the crack.

In addition to the above-mentioned thin films, SnO ² thin films, thin film on which surface conduction electron-emitting devices can be formed,
Au film (G. Ditter: "Thin Solid Films",
9, 317 (1972)), based on an In ² O ³ / SnO ² thin film (M. Hartwell and CGFonstad: "IEEE Trans. ED Con
f. ", 519 (1975)), using a carbon thin film (Hisashi Araki)
Others: Vacuum, Vol. 26, No. 1, 22 (1983)) and the like have been reported.

[0011] In the image display apparatus constructed as described above, since the residual gas is generated in the vacuum outside the enclosure after the vacuum envelope is formed (after sealing), getter the following processing facilities Is done.

FIG. 9 is a diagram for explaining the maintenance of a high vacuum by a getter in the conventional image display device shown in FIG.
Getter agent container fixing jig 1 provided on substrate 801
The getter agent container 103 is shown attached to the side surface of the getter agent container fixing jig 102 so that 02 serves as a shielding plate.

In the image display apparatus shown in FIG. 9, a getter is scattered by a flash, and the scattered getter is attached to an outer frame wall surface in a vacuum envelope , a getter agent container fixing jig 102, and the like. The residual gas generated in the vacuum envelope is captured by the obtained getter. After the residual gas is captured by the adhered getter, after the vacuum envelope is formed (after sealing), the vacuum is released.
The residual gas generated in the envelope is removed to prevent the degree of vacuum in the vacuum envelope from being reduced by the residual gas. Due to the exhaust effect of the getter, the inside of the vacuum envelope is maintained at a degree of vacuum of about 1 × 10 ⁻⁶ torr.

As described above, the inside of the vacuum envelope is approximately 1
In an image display device maintained at a degree of vacuum of about × 10 ⁻⁶ torr, image display is performed as follows.

When a drive pulse is applied to the device electrodes 902 and 903 of the surface conduction electron-emitting device 802 by an external drive circuit (not shown) while the inside of the vacuum envelope is maintained at a predetermined degree of vacuum, electron emission is performed. Electrons are emitted in a beam form from the portion 905. At this time, a high voltage (1 kV to 10 kV) is applied to the phosphor 805 and the metal back 806, so that the electrons emitted from the electron emission unit 905 are accelerated and collide with the phosphor 805. Due to this collision, the phosphor 805 emits light, and an image is displayed.

The electron source used in the above-mentioned image display apparatus includes a surface conduction electron-emitting device, a thermionic electron source using a hot cathode, and a field emission electron-emitting device (WPDy).
ke & W.W.Dolan, "Field emission", Advance in Electron
Physics, 8, 89 (1956), or CASpindt, "Physical pr
operties of thin-film field emission cathodeswith
molybdenum cones ", J. Appl. Phys., 47, 5248 (1976), etc.)
Metal / insulating layer / metal-type electron-emitting device (CAMead, "The tu
nnel-emission amplifier, J. Appl. Phys., 32, 646 (1961)
Etc.) are known.

[0017]

However, as described above, the image display apparatus in which the pressure in the vacuum envelope is maintained in a high vacuum state by the getter has the following problems.

In the image display device shown in FIG. 9, the getter agent container fixing jig 102 is provided on the substrate 80 so as to be a shielding plate.
1, the getter agent container fixing jig 1
A getter agent container 103 in which a getter is stored at 02 is attached. As described above, in a conventional image display device in which the getter agent container 103 is used as a shielding plate so that the scattering getter is not attached to the electron-emitting device or the like, the getter agent is used even when the getter exhaust effect is obtained. Since the container fixing jig 102 acts as a shielding plate,
There is a problem in that the pressure in the vacuum envelope may not be uniform, resulting in uneven brightness in a displayed image. Further, since the getter agent container fixing jig 102 and the getter agent container 103 are provided, there is a problem in that the production of the vacuum envelope takes time. If the getter agent container fixing jig 102 is not used as a shielding plate, there is a problem that the scattering getter adheres to the electron-emitting device or the like. The present invention has been made in view of the above-mentioned problems, and does not require a getter agent container fixing jig and a getter agent container, is simple to manufacture, and has excellent vacuum uniformity in a vacuum envelope . An object of the present invention is to provide an envelope and an image display device including the envelope .

[0019]

In order to achieve the above object, a vacuum envelope of the present invention comprises a substrate and a substrate provided opposite to each other.
And face plate and its substrate and face plate
With the outer frame provided between the
And have you in the vacuum envelope with a getter for exhausting that gas,
The getter is provided on the substrate or the face plate.
A getter groove for fixing the substrate is formed.
A plurality of plate-like atmospheric pressure supporting members
The plurality of flat plate-like anti-atmospheric pressure support members
The directions are substantially parallel, and the getter groove is provided in front of the substrate.
Around the area where the plurality of atmospheric pressure support members are provided,
Along the peripheral portion, the longitudinal direction of the getter groove portion
And the angle between the longitudinal direction of the plurality of atmospheric pressure support members and
It is characterized by being substantially perpendicular.

In this case, a plurality of the getter grooves are formed.
It may be that.

Further , the getter groove is provided with the plurality of atmospheres.
Disposed facing the periphery of the area where the pressure support member is provided
The first and second grooves may be formed.

The image display device of the present invention is an image display device having the vacuum envelope configured as described above,
4. An image display device comprising the vacuum envelope according to claim 1, wherein a phosphor is excited in the vacuum envelope to emit light. 5. Electricity for
An image display device comprising a child source .

In this case, the electron source may be any one of a thermal cathode, a field emission type electron-emitting device, and a surface conduction type electron-emitting device.

The present invention may be a display device for a television or a computer.

[0025]

In the vacuum envelope of the present invention, the getter groove is formed in the substrate, and the getter is fixed in the getter groove, so that the getter scattered by the flash is limited in its coverage area by the edge of the getter groove. And is attached to a predetermined area. The getter attachment area is determined by the position and size of the getter groove. As described above, in the present invention in which the getter is fixed to the getter groove formed in the substrate,
Since the getter agent container and the getter agent container fixing jig are not provided in the vacuum envelope unlike the conventional case, the pressure in the vacuum envelope when the getter is evacuated should be uniform. Can be. Further, in the present invention, in addition to the need to provide a getter agent container and a getter agent container fixing jig, the getter groove for fixing the getter is formed integrally with the substrate, so that the vacuum envelope Manufacturing is simplified.

In the present invention in which the atmospheric pressure supporting member is provided in the vacuum envelope , the getter groove is formed in the peripheral portion of the region of the substrate where the atmospheric pressure supporting member is provided, and in the peripheral portion. The angle between the longitudinal direction of the groove and the longitudinal direction of the atmospheric pressure support member is a right angle. for that reason,
The residual gas (gas molecules) floats along the atmospheric pressure support member and reaches the area where the getter scattered from the getter groove is attached. Therefore, in the present invention, since the atmospheric pressure support member does not act as a shielding plate, it is possible to increase the exhaust conductance when obtaining the exhaust effect by the getter, and to manufacture a vacuum envelope having a high ultimate vacuum. It becomes possible.

[0027] In the image display apparatus of the present invention using the vacuum envelope having the above-described functions, the getter groove is provided on the substrate at the periphery of the area where the atmospheric pressure support member and the image display member are provided. Therefore, the scattering getter does not adhere to the image display unit due to the limitation of the range in which the scattering getter is attached by the flash. Further, the getter groove is formed along the peripheral portion of the substrate at the peripheral portion of the region where the atmospheric pressure supporting member and the image display member are provided, and the length direction of the groove and the longitudinal direction of the atmospheric pressure supporting member are different from each other. because the angle has a right angle, even if the atmospheric pressure supporting member provided in the vacuum outside the envelope, it is possible to increase the exhaust conductance in obtaining an exhaust effect of the getter, high ultimate vacuum vacuum An envelope can be manufactured.

[0028]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a schematic structure of an image display device according to one embodiment of the present invention, and FIG. 2 is a sectional view of the image display device shown in FIG.

1 and 2, 1 is a substrate, 2 is a face plate, 3 is an outer frame, 4 is an electron-emitting device disposed on the substrate 1, and 5 is a predetermined distance between the substrate 1 and the face plate 2. Is a getter groove for accommodating the getter 7.

In the image display device of this embodiment, a vacuum envelope is formed by the substrate 1, the face plate 2, and the outer frame 3. In this vacuum envelope , an atmospheric pressure support member 5 is provided between the substrate 1 and the face plate 2,
This prevents distortion of the face plate 2 and the like due to atmospheric pressure when a large number of elements are arranged and formed over a large area.

The atmospheric pressure supporting members 5 are elongated flat plates, and a plurality of the atmospheric pressure supporting members 5 are arranged at predetermined intervals so that their longitudinal directions are the same. The getter groove 6 is a groove formed on the substrate 1 along the side of the substrate 1 around the region where the atmospheric pressure support member 5 is provided.
Are formed at positions (both ends of the substrate 1) where the longitudinal direction is perpendicular to the longitudinal direction of the atmospheric pressure support member 5 and the exhaust resistance (exhaust resistance determined by the direction of the atmospheric pressure support member 5) is the smallest. I have. In the present embodiment, the coverage of the getter during flashing is limited by the edge of the getter groove 6. Note that the atmospheric pressure support member 5 may have a configuration such as an atmospheric pressure support member 5 'in which the space between the getter grooves is divided in one direction as shown in FIG.

The surface conduction electron-emitting device provided in the vacuum envelope has the following configuration.

FIG. 4A is a plan view showing a schematic structure of a surface conduction electron-emitting device used in the image display device of this embodiment, and FIG. 4B is a surface conduction electron-emitting device shown in FIG. FIG. 3 is a cross-sectional view of the electron-emitting device taken along line BB.

In FIG. 4, 11 is a substrate, 12 and 13 are device electrodes arranged on the substrate 11 at regular intervals, 14 is a thin film, 15 is an electron emitting portion formed on the thin film 14 by forming, and 16 is a device. Wiring.

The device electrodes 12 and 13 are made of A having a thickness of 1000 Å.
u, the element electrode interval L is 2 microns, and the element electrode length W is 500 microns. The thin film 14 is formed by applying a solution containing organic palladium (CCP4230, manufactured by Okuno Pharmaceutical Co., Ltd.), which is an organic metal solution, and then performing a heat treatment at 300 ° C. for 10 minutes. Fine particle size 70
Å) is formed of a film. The electron emission section 15
It is formed of a film made of conductive fine particles having a particle size of several tens of millimeters.

As the electron source used in the image display device of the present embodiment, a thermionic source using a hot cathode, a field emission type electron emission element, or the like is used instead of the surface conduction type electron emission element. You may.

Next, a specific configuration of the above-described image display device of the present embodiment and a specific operation of the configuration will be described.

The substrate 1, the face plate 2, and the atmospheric pressure supporting member 5 are each made of soda glass. The size of the substrate 1 is 300 mm × 350 mm, and the size of the face plate 2 is 260 mm × 2
It is 86 mm. The atmospheric pressure support member 5 has a thickness of 2
It is 00 μm and the size is 40 mm × 3.8 mm. Note that a phosphor (not shown) is provided on the face plate 2.
Is applied, and a metal back (not shown) is formed.

The getter groove 6 is formed by shaving on the substrate 1 or integrally formed as a grooved plate when forming the substrate glass. As shown in FIG. 5, the getter groove 6 is a metal substrate 2 as a substrate.
It may be formed by forming the groove portion into a concave-convex shape using No. 1. In this getter groove 6, BaAl
Is provided by a fixing jig (not shown).

The image display device configured as described above is
It is manufactured as follows.

First, getter groove 6 and electron-emitting device 4
Is formed, a face plate 2 provided with a phosphor and a metal back, and an outer frame 3 form a vacuum envelope, and an atmospheric pressure-resistant reinforcing member is provided in the vacuum envelope as an atmospheric pressure resistant reinforcing member. The support members 5 are arranged at predetermined intervals in a certain direction.
Then, frit glass LS-0206 (manufactured by Nippon Electric Glass Co., Ltd.) was applied to a portion where the substrate 1, the face plate 2, the outer frame 3, and the atmospheric pressure support member 5 were in contact with each other, and heated at 450 ° C. for 10 minutes. Later, seal and surround the vacuum
Form a bowl .

Subsequently, the inside of the vacuum envelope is evacuated to about 1 × 10 ^-5 torr by an external vacuum pump through an exhaust pipe (not shown). When the inside of the vacuum envelope is evacuated to about 1 × 10 ⁻⁵ torr, a voltage pulse having a triangular waveform (1 msec at the bottom, a period of 10 msec, and a peak value of 5 V) is applied to the thin film constituting the electron-emitting device 4 for 60 seconds. Forming,
An electron emission portion is formed.

After forming the electron-emitting portion as described above, the entire vacuum envelope is heated at 130 ° C. for 24 hours to perform degassing. Then, after the getter 7 provided in the getter groove 6 is flushed at a high frequency of 350 kHz, the exhaust pipe is sealed off. As a result, an image display device maintained at a high vacuum is formed.

Hereinafter, the attachment of the getter to the flash and the operation thereof, which are features of the present invention, will be described.

In the above-described image display apparatus, since the getter 7 is fixed in the getter groove 6, the getter scattered by the flash is restricted by the edge of the getter groove 6, and the scattered area is limited. Is done. Therefore, here, the scattering getter is formed on the inner wall / bottom of the getter groove 6 and a part of the face plate 2 and the outer frame 3 (the inner surface of the face plate 2 which is assumed from the relationship between the shape of the getter groove 6 and the amount of scattering of the getter). And the getter-attached region only on the getter-attached portion on the wall of the outer frame 3).
Is formed along. The use of the scattering getter from the getter groove 6 allows the formation of a getter-covered region over a wide range.

In the getter-attached area formed as described above, the residual gas (gas molecules) generated in the vacuum envelope after the above-mentioned exhaust pipe is sealed off is captured. In the image display device of the present embodiment, since the longitudinal direction of each of the atmospheric pressure supporting members 5 is provided to be constant toward the getter-attached region, the residual gas (gas molecules) flows along the atmospheric pressure supporting member 5. And floats to reach the getter deposition area and is captured by the getter. Residual gas (gas molecules) of this getter
As a result, an exhaust effect is generated, and the inside of the vacuum envelope is maintained in a uniform high vacuum state.

In the image display apparatus of the present embodiment described above, the positional relationship between the getter groove 6 and the atmospheric pressure support member 5 depends on the efficiency of capturing the residual gas (gas molecules) in the getter attachment region (or the exhaust effect) and the vacuum. This greatly affects the uniformity of the pressure inside the envelope . Hereinafter, an example (comparative example) of an image display device in which the arrangement of the getter groove and the atmospheric pressure support member is different from that of the above-described image display device will be described, and the displayed images will be compared.

Comparative Example FIG. 6 shows the image display apparatus shown in FIG. 1 except that the getter groove 6 ′ is arranged along the side of the substrate so that the longitudinal direction thereof is parallel to the atmospheric pressure support member. It has the same configuration as. The same components as those in the image display device shown in FIG. 1 are denoted by the same reference numerals.

In the image display device shown in FIG. 6, the getter groove 6 ′ is arranged along the side of the substrate 1 so that its longitudinal direction is parallel to the longitudinal direction of the atmospheric pressure supporting member 5.
With such an arrangement, the exhaust resistance (exhaust resistance determined by the direction of the atmospheric pressure support member 5 in the exhaust by the adhered getter) is maximized. Hereinafter, the reason will be described.

When the getter is scattered by the flash,
A getter-attached region is formed in the same manner as in the case of the image display device shown in FIG. 1, and the residual gas (gas molecules) is captured by the getter-attached region. However, in the image display device shown in FIG. 6, each atmospheric pressure supporting member 5 is provided so that its longitudinal direction is parallel to the above-mentioned getter attachment region. Molecules are prevented from reaching the getter-attached region (shielding action of the atmospheric pressure support member 5). Therefore, in this image display device, the capture efficiency of the residual gas (gas molecules) decreases, and the exhaust effect by the getter decreases. Further, the shielding effect of the atmospheric pressure supporting member 5 causes the vacuum generated by the exhaust operation of the getter.
The exhaust inside the envelope becomes uneven.

Each of the above-described image display devices shown in FIGS. 1 and 6 was similarly manufactured in accordance with the above-described specific image display device manufacturing procedure, and was driven for a predetermined time. As a result, in the image display device shown in FIG. 1, no luminance unevenness occurred, and a good image was displayed. In the image display device shown in FIG. 6, luminance unevenness occurred in the image display surface.

From the above results, if the relationship between the arrangement of the getter groove and the atmospheric pressure support member is the same as that of the image display device shown in FIG. 1, the exhaust resistance in the vacuum envelope at the time of the exhaust by the getter is obtained. Can be set to the smallest state, whereby the degree of vacuum inside the image display device (inside the vacuum envelope ) can be maintained in a uniform state, and a good display image without luminance unevenness can be provided. Become.

Although the getter groove in the image display apparatus of the present embodiment described above is a long groove in a band shape having a concave cross-sectional shape, it is sufficient that the getter groove has a recess capable of securing a sufficient getter area. May be present.

Further, in this embodiment, the getter groove portion is composed of a pair of grooves provided along the side of the substrate.
The present invention is not limited to this, and a plurality of grooves may be provided depending on the structure of the vacuum envelope .

[0056]

Since the present invention is configured as described above, it has the following effects.

In the vacuum envelope according to any one of the first to third aspects, since the getter agent container and the getter agent container fixing jig are not provided unlike the related art, the exhaust by the getter is not performed. There is an effect that the pressure in the vacuum envelope at the time of the operation can be made uniform. In the case where the getter agent container and the getter agent container fixing jig are not provided as described above, in addition to the above effects,
This has the effect of simplifying the manufacture of the vacuum envelope .

[0058] Further, in addition to the above effects, since there is no possibility that the atmospheric pressure supporting member acts as a shield plate, it is possible to increase the exhaust conductance in obtaining an exhaust effect of the getter, high ultimate vacuum vacuum There is an effect that an envelope can be provided. Of these, claims
In those described in 2, since the getter deposit amount and the deposition area by the getter grooves are plurality is enlarged to improve the exhaust effects of the getter, high further ultimate vacuum than the vacuum There is an effect that an envelope can be provided.

In the third aspect , similarly to the above, since no getter agent container or getter agent container fixing jig is provided, the pressure in the vacuum envelope when the getter is evacuated is obtained. Has the effect of making the uniformity and the effect of simplifying the production of the vacuum envelope .

Further, the getter groove is provided on the periphery of the area where the atmospheric pressure support member and the image display member are provided on the substrate, and the coverage of the scattered getter by the flash is limited by the getter groove. It is possible to prevent the scattering getter from being attached to the image display unit, and it is possible to provide a good display image.

Further, even if the atmospheric pressure support member is provided in the vacuum envelope , the exhaust conductance for obtaining the exhaust effect by the getter can be increased, so that the ultimate vacuum degree inside the image display device can be increased. And a good image can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a schematic configuration of an image display device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the image display device shown in FIG.

FIG. 3 is a diagram illustrating an example of a configuration of an atmospheric pressure support member.

FIG. 4A is a plan view showing a schematic structure of a surface conduction electron-emitting device used in the image display device of the present embodiment,
(B) is the BB of the surface conduction electron-emitting device shown in (a).
It is sectional drawing.

FIG. 5 is a diagram showing an example in which a metal substrate is used as a substrate as an example of the configuration of the vacuum envelope .

FIG. 6 is a vacuum envelope arranged along the side of the substrate such that the getter groove is parallel to the atmospheric pressure support member and its longitudinal direction.
FIG. 3 is a configuration diagram showing an example of a container .

FIG. 7 is a partial cross-sectional view of a flat panel display using a surface conduction electron-emitting device.

8 is a partially enlarged view showing a schematic configuration of the surface conduction electron-emitting device 802 shown in FIG.

9 is a diagram for explaining high vacuum maintenance by a getter in the conventional image display device shown in FIG.

[Explanation of symbols]

 1, 11, 801 Substrate 2, 22, 804 Face plate 3, 23, 808 Outer frame 4, 802 Electron-emitting device 5, 5 'Atmospheric pressure support member 6, 6' Getter groove 12, 13, 902, 903 Device electrode 14 , 904 thin film 15, 905 electron emission part 16 element wiring 21 metal substrate 7, 24 getter 25 getter uneven part

Claims (6)

(57) [Claims] A substrate and a face provided to face each other
Provided between the plate and the substrate and the face plate
Exhaust gas generated inside
In a vacuum envelope having a getter, the getter is provided on the substrate or the face plate.
Is formed, and a plurality of flat resistive plates are formed between the substrate and the face plate.
An atmospheric pressure support member is provided, and a plurality of flat anti-atmospheric pressure support members are substantially parallel in a longitudinal direction.
And wherein the getter groove is provided with the plurality of atmospheric pressures of the substrate.
Along the periphery of the area where the support member is provided, along the periphery
A longitudinal direction of the getter groove and the plurality of large
The angle made with the longitudinal direction of the barometric pressure support member is approximately
A vacuum envelope. 2. The vacuum envelope according to claim 1, wherein a plurality of said getter grooves are formed. 3. The vacuum envelope according to claim 1, wherein the getter groove is disposed so as to face a periphery of a region where the plurality of atmospheric pressure support members are provided. A vacuum envelope comprising a first and a second groove. 4. An image display device comprising the vacuum envelope according to claim 1, wherein a phosphor and a phosphor are provided in the vacuum envelope. An image display device comprising an electron source for exciting and emitting light. 5. The image display device according to claim 4, wherein the electron source is any one of a hot cathode, a field emission type electron emission element, and a surface conduction type electron emission element. 6. The image display device according to claim 4, wherein the image display device is a display device for a television or a computer.