JP2000208073A - Image display device and cathode tube - Google Patents

Abstract

(57) [Summary] [Problem] To prevent deterioration of a displayed image due to mixing of a spacer and the like, and to prevent air bubbles that adversely affect an image from being mixed in a bonding process, and to reduce protrusion of an adhesive. In addition, the present invention provides an image display device that can reduce the process of bonding the image display panel and the front plate to each other, thereby reducing the in-line process speed and reducing the cost. SOLUTION: In an image display device in which a transparent front plate is adhered to a front surface of a glass face plate by using a transparent adhesive to form an image display area, application and curing are performed in advance on the face plate or the transparent front plate. And an adhesive layer A for bonding the adhesive layer A and the face plate or the transparent front plate to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a plasma display panel (PDP), a field emission display (FEP), a cathode ray tube (CRT), a liquid crystal display (LCD), and a cathode tube.

[0002]

2. Description of the Related Art Image display devices having various image display face plates, such as CRTs, are required to be further enlarged and research is being actively conducted. Also,
With the increase in size, reduction in thickness, weight, and cost of the device have become important issues. Then, the inventors have studied a surface conduction electron-emitting device and an image display device using the surface conduction electron-emitting device as an image display device that can solve the above-described problem.

[0003] The inventors, for example, have shown in FIG.
The application of a multi-electron beam source by an electrical wiring method as shown in FIG. That is, it is a multi-electron beam source in which a large number of surface conduction emission devices are two-dimensionally arranged and these devices are wired in a simple matrix as shown in the figure.

[0004] In the figure, reference numeral 4001 schematically shows a surface conduction electron-emitting device, 4002 is a wiring in a row direction, and 4003 is a wiring in a column direction. For convenience of illustration, the matrix is shown as a 6 × 6 matrix, but the size of the matrix is, of course, not limited to this, and the elements are arranged and wired enough to display a desired image. It is.

FIG. 11 shows a structure of a cathode ray tube using the multi-electron beam source. Here, an outer container bottom 4005 having a multi-electron beam source 4004, an outer container frame 4007, a phosphor The structure includes a layer 4008 and a face plate 4006 having a metal back 4009. The metal back 4009 of the face plate 4006 is supplied with a high-voltage power supply 4010
A high voltage is applied through the high voltage introduction terminal 4011.

[0006] In a multi-electron beam source in which surface conduction electron-emitting devices are arranged in a simple matrix, an appropriate electric signal is applied to a row direction wiring 4002 and a column direction wiring 4003 in order to output a desired electron beam. For example, to drive the surface-conduction emission element of an arbitrary row in the matrix, the selection voltage Vs is applied to the row-directional wiring 4002 of the selected row, and at the same time, the row-directional wiring 40 of the non-selected row is applied.
02, a non-selection voltage Vns is applied. In sync with this,
A driving voltage Ve for outputting an electron beam is applied to the column direction wiring 4003.

According to this method, a voltage of Ve-Vs is applied to the surface conduction electron-emitting device of the selected row.
A voltage of Ve-Vns is applied to the surface conduction type emission elements in the non-selected rows. If Ve, Vs, and Vns are set to voltages of appropriate magnitudes, an electron beam with a desired intensity is output only from the surface conduction electron-emitting device in the selected row, and a different drive voltage Ve is applied to each of the column-directional wirings. If applied, electron beams of different intensities are output from each of the elements in the selected row. In addition, since the response speed of the surface conduction electron-emitting device is high, if the length of time during which the drive voltage Ve is applied is changed, the length of time during which the electron beam is output can be changed.

[0008] The electron beam output from the multi-electron beam source 4004 by the voltage application as described above is applied to the metal back 4009 to which a high voltage is applied, and excites a target phosphor to emit light. Therefore, for example, if a voltage signal corresponding to image information is appropriately applied, an image display device can be obtained.

In the above image display device, a multi-electron beam source, a phosphor layer, and the like are formed in a glass vacuum vessel. In other image display devices, a glass member is used for a portion for displaying a screen. Is the majority. For this reason, the image display sections of these image display devices are damaged,
Scattering of dangerous glass shards may put the observer at serious danger, but this danger increases with the size of the device.

Therefore, in order to ensure safety on the front surface of the face plate of the image display device, a film for preventing glass scattering is provided, or a transparent resin plate or a tempered glass front plate is attached to the observer side of the face plate. It is proposed to provide a gap between the face plate and the like.

[0011] However, it is difficult to obtain sufficient safety in an increasingly large-sized image display apparatus only by providing a film for preventing glass scattering. Also, if a transparent resin plate is provided as a front plate, leaving a gap with the face plate, if the screen is enlarged,
There is a problem that the rigidity of the resin plate is insufficient and the resin plate is bent and comes into contact with the face plate. In addition, if the tempered glass is provided as a front plate with a gap between the face plate and the face plate, a sufficient strength is obtained and the weight becomes considerable. Moreover, when the front plate is provided with a gap, external light is reflected on both the front and rear surfaces of the front plate and the front side of the face plate. Becomes large, so that there is a problem that an image becomes extremely difficult to see. The reflection of external light can be reduced by an antireflection film, but generally, there is a problem in that the production of the antireflection film requires a large cost.

In order to solve these problems, a structure is considered in which a transparent resin plate is bonded to a face plate using a transparent adhesive. With this configuration, because the front plate is a resin plate, it is lighter than using tempered glass, and since the refractive index of the glass, the adhesive layer, and the front plate are not so different, the reflection of external light is It only occurs on the front side of the front panel.

[0013]

However, when the transparent resin plate is bonded to the glass face plate, the following problems occur. That is, a front plate of a resin plate to be bonded,
Since the face plate made of glass has a different coefficient of thermal expansion from each other, the panel may be damaged by a change in temperature unless measures are taken to make the adhesive layer elastic and increase the thickness of the adhesive layer. Therefore, it is conceivable to use spacers such as glass beads in order to make the thickness of the adhesive layer uniform, but if there is a difference in the refractive index between the adhesive and the spacer, the boundary between them will be visible. However, there is a fear of deteriorating the image.

Further, when air bubbles are mixed into the adhesive layer during bonding, the image is deteriorated. However, when the screen is large and the adhesive layer is thick, air bubbles are easily mixed. Therefore,
In order to prevent air bubbles from entering as much as possible, the adhesive layer should be as thin as possible, and the amount of adhesive used should be larger than necessary. At the same time, it must be pushed out of the image area of the front panel.

However, if a large amount of adhesive is used to increase the thickness of the adhesive layer, it takes a long time to cure the adhesive. The bonding between the front plate and the face plate must be performed after the image display panel is created for the convenience of the process.However, if the bonding takes a long time, the time required for the image display panel line process will be significantly reduced. This is a new problem of extension.

The present invention has been made to solve such a problem, and when a front plate and a face plate are adhered to each other with an elastic adhesive layer, a display image is deteriorated due to mixing of a spacer. In addition, in the bonding process,
It is difficult for air bubbles that adversely affect the image to be mixed, and
Provided is an image display device that can reduce the amount of adhesive that overflows, and can also shorten the process of bonding the image display panel and the front plate, thereby reducing the in-line process speed and reducing cost. The purpose is to:

[0017]

Therefore, in the present invention,
Using a transparent adhesive on the front of the glass face plate,
In an image display device in which an image display area is formed by bonding a transparent front plate, an adhesive layer A is formed by previously applying and curing the face plate or the transparent front plate.
And an adhesive layer B for bonding the adhesive layer A and the face plate or the transparent front plate to each other.

In this case, as an embodiment of the present invention, the length of the long side of the front plate is Xf, the length of the short side is Yf,
The length of the long side of the image display area is Xg, and the length of the short side is Y
g, and when the length of the long side of the adhesive layer A is Xa and the length of the short side is Ya, Xf ≧ Xa> Xg and Yf ≧ Ya
> Yg is preferably set.

In another embodiment, the length of the long side of the front panel is Xf, the length of the short side is Yf, the length of the long side of the image display area is Xg, and the length of the short side is Xg. Let Yg be
The length of the long side of the adhesive layer A is Xa, and the length of the short side is Ya.
When the size of the adhesive layer A is Xf>Xa> X
g and Yf>Ya> Yg.

Moreover, in these embodiments, the length Ya of the short side of the adhesive layer A is set so as to satisfy Yf>Ya> Yg, and the thickness at the center of the adhesive layer A Is set to satisfy Tc ≧ Te when the thickness of the adhesive layer A in the end region of each side is Te, and at least four corners among the end portions of the adhesive layer A Has a chamfered structure, the front plate is a resin plate, the front plate is provided with means for preventing reflection of external light, the front plate is sufficient for antistatic It is preferable that the front plate has conductivity, and that the front plate has a transmittance limiting function.

Also, the face plate having the front plate as described above is used for a cathode tube as an image display device, and the cathode ray tube uses a surface conduction electron-emitting device. This is a feature of the present invention.

With such a configuration, according to the present invention, the amount of the adhesive used for the adhesive layer B can be minimized, and therefore, the thickness of the adhesive layer (the adhesive (Thickness of the agent layer A + thickness of the adhesive layer B) is almost determined, so that if the thickness of the adhesive layer A can be made uniform, a substantially uniform thickness can be easily realized. Further, in the step of bonding the image display panel and the front plate, the adhesive used is only a small amount of the adhesive used for the adhesive layer B, so that the handling of the adhesive becomes easy, and the curing time of the adhesive becomes longer. Due to the fact that the amount changes with the amount of the agent, the smaller the amount of the adhesive, the faster the curing, so that the line process speed of the image display panel bonding can be significantly increased, and the cost of the image display panel can be reduced.

When the adhesive is applied to the front plate to form the adhesive layer A by satisfying the above-mentioned certain conditions, a frame for preventing the adhesive from flowing out is attached to the end of the front plate. be able to. Therefore, it is easy to form the adhesive layer A with a substantially uniform thickness, and the amount of the adhesive used is reduced. Further, even when the adhesive of the same material is used, the trace of the frame when the adhesive layer A is formed can be visually recognized even after the adhesive layer B is formed, so that the image may be temporarily deteriorated. Even if it occurs, by using a structure that covers the image area with the adhesive layer A, the trace of the frame when forming the adhesive layer A is set outside the image area so that the image is not adversely affected. Can be.

Further, under the above-mentioned conditions, the size of the adhesive layer A is further determined as Xf>Xp>Xa> Xg and Yf
>Yp>Ya> Yg, when the front plate provided with the adhesive layer A is bonded with the bonding layer B, the Xf-X between the front plate and the face plate is set.
a or Yf-Ya becomes a liquid pool, and the excess adhesive used for the adhesive layer B can be bonded without protruding from the face plate, and the protruding adhesive has an adverse effect on a circuit board and the like. Will be eliminated.

The length Ya of the short side of the adhesive layer A
Has a structure that satisfies Yp>Ya> Yg, so that a frame for preventing the adhesive from flowing out at the time of manufacturing the adhesive layer A may be formed only on the long side, and the adhesive may overflow. The above-mentioned liquid pool can be formed at the end of the long side having a large size.

The thickness of the center of the adhesive layer A is represented by Tc.
When the thickness of the thickest portion of the adhesive layer A in the end region of each side in the range of approximately 10 mm is Te,
By adopting a structure that satisfies Tc> Te, bubbles can be prevented from remaining in the area of the adhesive layer A in the step of bonding the front plate and the adhesive layer A to the face plate with the adhesive layer B.

Further, at least four corners of the end of the adhesive layer A are provided with a chamfered structure for allowing air to escape when the adhesive layer B is adhered to the face plate, so that the front plate and the front plate are provided. In the step of bonding the adhesive layer A and the face plate with the adhesive layer B, bubbles can be prevented from remaining in the area of the adhesive layer A.

The front plate can be reduced in weight by using a resin plate, and by providing means for preventing reflection of external light on the front plate, it is possible to reduce the amount of light reflected by the front plate. By overlapping the light image and the image, it is possible to prevent the image from being difficult to see.Furthermore, by providing the front plate with sufficient conductivity to prevent charging, the front plate surface is charged. Then, when an observer touches the front panel, it is possible to prevent an unpleasant electric shock or dust from adhering to the front panel, thereby making it difficult to view the image.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Next, FIG.
An embodiment of the configuration of the face plate and the front plate of the image display device, which is the subject of the present invention, will be described with reference to FIG. 2 and FIG. That is, a phosphor layer 1008 having a thickness of about 20 μm is formed on the inner surface of a face plate 1007 having a thickness of 3 mm and made of soda lime glass, and a phosphor layer having a thickness of about 1000 Å is further covered so as to cover the phosphor layer. , An aluminum metal back layer 1009 is formed. In addition, the high voltage introduction terminal 1021 is connected to the aluminum metal back 1009, is connected to the high voltage power supply 1020,
A high potential, for example, 10 kV, is applied.

A transparent front plate 1012 is bonded to the outside of the face plate 1007 using an adhesive layer 1013. Here, the face plate 10 described above is used.
07 is 1040 × 640 mm, front panel is 1020 × 62
0 mm, and the image display area 1017 is 1000 × 60
The size was 0 mm. Also, as the front plate 1012,
Although a 1 mm thick polycarbonate plate was used in consideration of weight, flame retardancy, and light transmittance, it is a matter of course that the present invention is not limited to this, and a resin plate such as acrylic may be used. In addition,
As the front plate 1012, a flat glass such as a tempered glass or a soda lime glass may be used, but the weight is heavy and a sharp portion is exposed in case of breakage, which may cause damage to an observer. Therefore, it is preferable to use a transparent resin plate.

By bonding the front plate 1012 to a glass face plate 1007 by an adhesive layer 1013, it is possible to prevent the glass member of the image display panel from scattering, and a transparent resin plate is formed on the front plate 1012. If used, not only will the glass be prevented from scattering when the panel is broken, but also the sharp portions will be prevented from being exposed, greatly improving safety.

Face plate 1007 and transparent front plate 1
The adhesive layer 1013 for bonding 012 is made of a face plate 1007 made of soda lime glass and the transparent front plate 1013.
Due to the difference in the coefficient of thermal expansion from 12, the stress generated when the temperature of the image display panel changes is required to be reduced. Therefore, in this embodiment, particularly, a resin plate such as polycarbonate is used as the transparent front plate 1012. However, the thermal expansion coefficients of soda lime glass and polycarbonate are significantly different, and the image display panel is large. In this case, the adhesive layer 1013 requires considerable elasticity.

For this reason, in this embodiment, the adhesive layer 1
In order to give 013 a sufficient elasticity, a silicone thermosetting adhesive (for example, SE1740 manufactured by Dow Corning Toray Co., Ltd.), which is an adhesive made of a material having excellent transparency and light transmittance, a low elastic modulus, and a high elongation, is used. ) Is used. The thickness of the adhesive layer is set to 1 mm, but is not limited to this, as long as the adhesive is transparent and the adhesive layer is rich in elasticity.

Further, the adhesive layer 1013 is formed to have a substantially uniform thickness and a thickness of about 1 mm as in this embodiment.
It is very difficult to form a thick layer uniformly. In order to solve this problem, it is conceivable to mix a spacer such as glass beads into the adhesive layer. However, even if the refractive index of the adhesive and that of the spacer are different by only about 0.1, the outline of the spacer is visually recognized. This makes it difficult to view the displayed image.

Therefore, in the present invention, in order to solve this problem, the front plate 1012 or the face plate 1012 is used.
07, a transparent adhesive is applied and cured in advance to form an adhesive layer A1014 having a thickness of about 0.9 mm, and the front plate 1012, the adhesive layer A1014, and the face plate 1007 are bonded to the adhesive layer B. Glue using As a result, without causing problems such as visibility of the spacer,
An adhesive layer 1013 having a substantially uniform thickness forms the front plate 101.
2 and the face plate 1007 can be bonded.

Next, a method of forming the adhesive layer A1014 by applying and curing an adhesive in advance will be described. The adhesive layer A1014 may be formed on one of the face plate 1007 and the front plate 1012. In this embodiment, when the adhesive layer A1014 is formed on the face plate 1007 side, a line process for forming an image display panel is performed. Of the adhesive layer A101
In consideration of an increase in panel manufacturing cost if the yield is low at the time of forming the adhesive layer 4, the adhesive layer A is attached to the front plate 101.
Created on two sides. Thereby, the adhesive layer A1014
Can be created outside the line process and used on the line, so that the speed of the line process can be improved and the cost can be reduced.

As a manufacturing process, first, a frame for preventing the adhesive from flowing out is provided on the front plate 1012 made of polycarbonate. The material of the frame is not limited as long as it has a function of preventing the adhesive from flowing out. In this embodiment, the material is made of PTFE and processed into a marshmallow shape, and has a thickness of 1 m.
A tape provided with an adhesive for fixing the tape to the front plate 1012 was used as a frame for preventing the adhesive from flowing out.

Next, after removing bubbles contained in the adhesive, the required amount of the adhesive is applied from a nozzle to a front plate 1012 or a face plate 1007 provided with a frame.
The adhesive was cured by heating to 50 to 80 ° C., and after the adhesive was completely cured, the frame was removed to form an adhesive layer A1014.

Next, a process of bonding the front plate 1012 provided with the adhesive layer A 1014 and the face plate 1007 using the adhesive layer B 1015 will be described. As the adhesive used for the above-mentioned adhesive layer B1015, adhesive layer A
A material similar to the adhesive used in 1014 is used. The adhesive may be applied to the front plate 1012 or the face plate 1007. In consideration of ease of handling at the time of application, here, the adhesive is applied to the front plate 1012 by a spin coating method. The adhesive may be applied by a method other than the coating method.

The front plate 1012 to which the adhesive has been applied
The front plate 1012 was tilted so that air bubbles did not enter, and was brought into contact with the face plate 1007 from one end, and the adhesive was cured to form an adhesive layer B1015. here,
In the interface between the adhesive layer A1014 and the adhesive layer B1015, when there is a component parallel to the line of sight of the observer, the boundary line can be visually recognized due to a slight difference in refractive index due to curing conditions and the like. And the image becomes difficult to see. Therefore, in this embodiment, the length of the long side of the face plate 1007 is Xg, the length of the short side is Xf,
The length of the long side of the adhesive layer A is Xa, and the length of the short side is Y.
a, when the length of the long side of the image display area 1017 is Xg and the length of the short side is Yg, for example, Xa = 1005m
By setting m and Ya = 605 mm, Xf ≧ Xa>
Xg, Yf ≧ Ya> Yg, and the adhesive layer A1014 is set so that the boundary line is outside the image display area 1017.
Are appropriately set to cover the image area, and the boundary line is hidden by the housing of the image display panel when viewed from the observer. Thus, it is possible to prevent image deterioration due to the visibility of the boundary line.

As described above, when the transparent front plate 1012 was bonded to the face plate 1007 of the image display device of the present invention using the adhesive layer A1014 and the adhesive layer B1015, the adhesive layer A1014 and the adhesive layer B101 were adhered.
The boundary surface between the face plate 1007 and the front plate 1012 could be adhered with an adhesive layer having a substantially uniform thickness without obstructing the boundary between the face plate 1007 and the image in the image area.

Next, the structure and manufacturing method of the display panel of the image display device to which the present invention is applied will be specifically described.
FIG. 8 is a perspective view of the display panel used in the above-described embodiment, in which a part of the panel is cut away to show the internal structure. In the figure, reference numeral 1005 denotes an outer container bottom (sometimes referred to as a rear plate), 1006 denotes a side wall, and 1007 denotes a face plate. These components 1005 to 1007 maintain the inside of the display panel at a vacuum. To form an airtight container.

When assembling the airtight container, it is necessary to seal the joints of the members in order to maintain sufficient strength and airtightness. Here, for example, frit glass is applied to the joints and the air is applied to the joints. In a nitrogen atmosphere
Sealing was achieved by baking at 400 to 500 degrees Celsius for 10 minutes or more. A method of evacuating the inside of the airtight container will be described later.

The rear plate 1005 has a substrate 1001
Are fixed, but N × M surface-conduction emission devices 1002 are formed on the substrate (NM is a positive integer of 2 or more, and is appropriately set according to the target number of display pixels. In this embodiment, N = 3360, M = 6
30). The N × M surface conduction electron-emitting devices are arranged in a simple matrix by M row-directional wirings 1003 and N column-directional wirings 1004. This component 1
001 to 1004 are called multi-electron beam sources.

In this embodiment, a substrate 100 of a multi-electron beam source is provided on a rear plate 1005 of an airtight container.
1 is fixed, but when the substrate 1001 of the multi-electron beam source has a sufficient strength, the substrate 100 of the multi-electron beam source is used as a rear plate of the hermetic container.
1, You may use itself.

On the lower surface of the face plate 1007, a fluorescent film 1008 is formed. Since the image display device in this embodiment is a color display device, the portion of the fluorescent film 1008 is used in the field of CRT.
Phosphors of three primary colors of red, green, and blue are separately applied.
For example, the phosphors of each color are separately applied in stripes as shown in FIG. 9A, and a black conductor 1010 is provided between the phosphor stripes. The purpose of providing the black conductor 1010 is to prevent the display color from shifting even if the electron beam irradiation position is slightly shifted, to prevent reflection of external light, and to reduce the display contrast. And preventing charge-up of the fluorescent film by an electron beam. The black conductor 10
Although graphite was used as the main component for 10, a material other than the above may be used as long as it is suitable for the above purpose.

The method of applying the phosphors of the three primary colors is not limited to the stripe arrangement shown in FIG. 9A, but may be, for example, a delta arrangement shown in FIG. 9B. It may be a state arrangement or another arrangement. Note that when a monochrome display panel is manufactured, a single-color phosphor material may be used for the phosphor film 1008, and a black conductive material does not necessarily have to be used.

A metal back 1009 known in the field of CRTs is provided on the surface of the fluorescent film 1008 on the rear plate side.
Is provided. The purpose of providing the metal back 1009 is
A part of the light emitted from the fluorescent film 1008 is specularly reflected to improve the light utilization rate, and the fluorescent film
08, protect it as an electrode for applying an electron beam acceleration voltage, and make the fluorescent film 1008 function as a conductive path of excited electrons.

The metal back 1009 is a fluorescent film 1008
Was formed on the face plate substrate 1007, the surface of the fluorescent film was smoothed, and aluminum was formed thereon by vacuum evaporation. When a fluorescent material for low voltage is used for the fluorescent film 1008, the metal back 100
9 is not used. Although not used in this embodiment, a transparent electrode made of, for example, ITO is provided between the face plate substrate 1007 and the fluorescent film 1008 for the purpose of applying an acceleration voltage and improving the conductivity of the fluorescent film. May be provided.

Dx1 to Dxm and Dy1 to Dy
n and Hv are electric connection terminals having an airtight structure provided for electrically connecting the display panel to an electric circuit (not shown). Dx1 to Dxm are electrically connected to the row wiring 1003 of the multi-electron beam source, Dy1 to Dyn are connected to the column wiring 1004 of the multi-electron beam source, and Hv is electrically connected to the metal back 1009 of the face plate.

In order to evacuate the inside of the hermetic container to a vacuum, after assembling the hermetic container, an exhaust pipe and a vacuum pump (both not shown) are connected, and the inside of the hermetic container is 10 −7 [Torr]. ] To a degree of vacuum. Thereafter, the exhaust pipe is sealed, but a getter film (not shown) is formed at a predetermined position in the airtight container immediately before or after the sealing in order to maintain the degree of vacuum in the airtight container. The getter film is, for example, a film formed by heating and vapor-depositing a getter material containing Ba as a main component by a heater or high-frequency heating. Minus 5th power or 1
The degree of vacuum is maintained at × 10−7 [Torr]. The above is the basic configuration and manufacturing method of the display panel according to the present invention.

Next, the multi-electron beam source used for the display panel in the above embodiment will be described. The material, shape, and manufacturing method of the surface conduction electron-emitting device are not limited as long as the multi-electron beam source used in the image display device of the present invention is an electron source in which surface conduction electron-emitting devices are arranged in a simple matrix.

However, the present inventors have found that among the surface conduction electron-emitting devices, those in which the electron-emitting portion or its peripheral portion is formed of a fine particle film have excellent electron-emitting characteristics and can be easily manufactured. Heading. Therefore, it can be said that it is most suitable for use in a multi-electron beam source of a high-luminance, large-screen image display device. Therefore,
In the display panel of this embodiment, a surface conduction electron-emitting device in which the electron-emitting portion or its peripheral portion is formed of a fine particle film is used.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. Note that an adhesive layer 1013 that adheres to the transparent front plate 1012 when an image display panel is created using the same soda lime glass face plate 1007 as in the first embodiment and a multi-electron beam source. Will be described.

As in the first embodiment, the transparent front plate 1012 is made of polycarbonate having a thickness of 1 mm from the viewpoints of safety, light transmittance, flame retardancy and the like, but is of course limited to this. Not a thing, for example, a thickness of about 0.5
The object of the present invention can also be achieved by a transparent resin plate or tempered glass of polycarbonate or acrylic having a thickness of at least mm.

As the adhesive used for the adhesive layer 1013,
A photocurable adhesive (for example, Luxtrack LCR0634 manufactured by Toa Gosei Chemical Co., Ltd.) was used. This adhesive is transparent and excellent in light transmittance, can be cured by irradiation with ultraviolet light and visible light, and cures in a relatively short time, which is advantageous in terms of cost. Here, a light-curing adhesive was used, but is not limited to this. Of course, any material may be used as long as it is transparent, has excellent light transmittance, and has elasticity. An agent may be used.

Next, the adhesive layer 1013 will be described.
The adhesive layer 1013 includes an adhesive layer A1014 and an adhesive layer B1015 as in the first embodiment.
Smaller than the required image display area 1017. The adhesive layer A1014 has a face plate 1007
Alternatively, it is formed by applying and curing the front plate 1014 in advance, but in this case, as described in the first embodiment, in order to form a substantially uniform thickness, before applying the adhesive, It is desirable to provide a frame for preventing the adhesive from flowing out.

Here, the adhesive layer A 1014 was formed on the front plate 1012 in consideration of the facts already described in the first embodiment. As the frame for preventing the adhesive from flowing out, the material and shape are not limited as long as the adhesive can be prevented from flowing out until the adhesive is hardened. For example, a metal or rubber is applied from the side of the front plate 1012. A structure to press is considered, but when using a thermosetting adhesive, of course, even when using a light curing adhesive,
The temperature of the front plate 1012 rises due to heat or reaction heat from the light source, and a gap is formed between the front plate 1012 and the pressing frame.
There is a fear that the adhesive may leak out. Therefore, the frame is preferably a tape-shaped one provided with an adhesive as shown in the first embodiment.

As described above, when the adhesive layer A1014 is formed and then the frame is removed, the adhesive layer A1014 becomes
It becomes smaller than the front plate 1012, and creates a gap when it is bonded to the face plate. These voids can act as a pool of adhesive when forming the adhesive layer B1015, as described below.

After forming the adhesive layer A 1014, the face plate 1007 and the front plate 1012 are bonded by the adhesive layer B 1015. The most problematic problem in forming the adhesive layer B1015 is that bubbles 1018 are mixed into the image display area 1017, thereby deteriorating the image. In order to avoid the inclusion of air bubbles 1018, it is preferable to apply an adhesive in excess of the required amount. However, if the amount of the adhesive is excessive, the adhesive will protrude from the front plate 1012 and the face plate 1007, and Adversely affect the device and make it difficult to incorporate it into the housing.

Therefore, in the present invention, the front plate 101
When the adhesive layer A is formed by applying and curing the adhesive on the substrate 2, the size is determined by Xf>Xa> Xg and Yf>Ya> Y
g, the surplus of the adhesive used for the adhesive layer B1015 is reduced by the face plate 1007 and the front plate 101.
The space that protrudes can be limited by the gap that acts as a liquid pool with 2.

Further, the bubbles 1018 erroneously mixed into the adhesive are pushed out into the voids together with the surplus of the adhesive, and the bubbles 1018 once pushed out flow back into the adhesive layer A 1014 again. Therefore, the possibility that the adhesive is mixed into the image display area 1017 is greatly reduced. In this embodiment, the adhesive used as the adhesive layer B1015 is applied on the face plate, and the front plate 1012 having the adhesive layer A1014 is provided.
After installing, irradiate light from the front plate 1012 side,
The adhesive has cured.

As described above, surplus adhesive flows out without adversely affecting the image display panel.
The air bubbles 1018 were not mixed into the adhesive layer of the image display area 1017 to adversely affect the image, and the face plate 1007 and the front plate 1012 could be bonded.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. 3 and FIG. Note that, here, when an image display panel is created using the same soda lime glass face plate 1007 as in the first embodiment and a multi-electron beam source, the image display panel is configured. The adhesive layer 1013 that adheres to the transparent front plate 1012 will be described.

As in the case of the first embodiment, the transparent front plate 1012 is made of polycarbonate having a thickness of 1 mm from the viewpoints of safety, light transmittance, flame retardancy and the like, but is of course limited to this. Not a thing, for example, a thickness of about 0.5
The object of the present invention can also be achieved by a transparent resin plate or tempered glass of polycarbonate or acrylic having a thickness of at least mm. As the transparent adhesive, a light-curable adhesive was used, as in the second embodiment. However, the present invention is not limited to this. For example, a thermosetting adhesive may be used. Good.

Next, the adhesive layer 1013 will be described.
The adhesive layer 1013 includes an adhesive layer A1014 and an adhesive layer B1015 as in the second embodiment, and the adhesive layer A1014 is smaller than the front plate 1012,
It is larger than the image display area 1017. Adhesive layer A101
As described in the second embodiment, the tape 4 is preferably formed in the form of a tape. However, since it is difficult to reuse the tape, it is preferable that the tape be formed as small as possible. Producing a frame is not preferable because it also increases the time for the process.

Therefore, in the present invention, the adhesive layer A1014
In the structure in which the length Ya of the short side of Y satisfies Yp>Ya> Yg, the frame for preventing the adhesive from flowing out when the adhesive layer A is manufactured may be formed only on the long side. Moreover, the gap after removing the frame can be formed as a liquid pool at the end of the long side where the adhesive is likely to protrude.

Here, a method of forming the adhesive layer A1014 will be described. As shown in FIG. 5, the front side plate 1014 is disposed so that the short side surfaces thereof are in contact with each other, and the long side frame 102
2 is fixed with a roller 1023 to prevent the adhesive from flowing out, and then the adhesive is applied from a nozzle 1024. After the adhesive is applied and the thickness of the adhesive becomes substantially uniform, the lamp houses 1025 arranged above and below the front plate 1012 are applied.
Light is irradiated from the light source to cure the adhesive.

By arranging the lamp houses 1025 up and down, the curing time can be shortened, and the front plate 1
Even when the adhesive protrudes from the short side surfaces that are in contact with each other, the adhesive can be cured without going around the front side of the front plate 1012. In addition, a liquid pool for preventing the adhesive from flowing out when the bonding is performed by the adhesive layer B1015 is formed on the long side where the adhesive is likely to protrude.

Next, the face plate 1007 and the front plate 1012 are adhered by the adhesive layer B1015. Here, the adhesive was applied to the upper surface of the face plate 1007 using a dispenser. At this time, the area to be applied is an image area, and the amount necessary for application, here 0.1
About 10% more than the amount required for the adhesive layer B1017 having a thickness of mm was applied. Next, the front plate 1012 having the adhesive layer A1015 is gently brought into contact with the face plate 1007 from one short side.
2. Light was irradiated from above to cure the adhesive.

As described above, the adhesive layer A1014 is formed. At this time, a frame for preventing the adhesive from flowing out is provided only on the long side, thereby simplifying the process and reducing the cost.
An adhesive layer B1 is provided on the long side where the adhesive is likely to protrude.
By forming a liquid pool when creating 015,
The surplus adhesive protruded, and the face plate 1007 and the front plate 1012 could be adhered without adversely affecting images and the like.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. First
Using a face plate 1007 made of soda lime glass similar to that of the embodiment and a multi-electron beam source,
When forming the image display panel, an adhesive layer 10 to be adhered to the transparent front plate 1012 to constitute the image display panel.
13 will be described.

Here, as in the first embodiment, the transparent front plate 1012 is made of polycarbonate having a thickness of 1 mm. However, the present invention is not limited to this. For example, the transparent front plate 1012 has a thickness of approximately 0.5 mm. The object of the present invention can also be achieved by the above-mentioned polycarbonate or acrylic transparent resin plate or tempered glass. Also, the adhesive layer 1013
As the transparent adhesive used for the second embodiment, a light-curable adhesive was used as in the second embodiment, but is not limited to this, and for example, a thermosetting adhesive is used. You may.

Next, the adhesive layer 1013 will be described.
When forming the adhesive layer A1014, a frame was formed to prevent the adhesive from flowing out. However, if the wettability of the frame with the adhesive was large, the contact angle of the adhesive became large, 6
(A), the adhesive layer A1014 is formed in a shape in which the adhesive is sucked up along the frame.

When the end of the adhesive layer A1014 has a thick shape, as shown in FIG. 6 (b), when bonding using the adhesive layer B1015, bubbles are added to the adhesive. If 1018 is mixed, a large amount of the bubbles 1018 will stay in the area of the adhesive layer A1014. Therefore, here, the frame is made of a material that increases the contact angle of the adhesive. Specifically, it is made of Teflon,
Although a smooth frame having few irregularities on the surface was used, it is a matter of course that the present invention is not limited to this, as long as the wettability of the adhesive is low.

As in the first embodiment, even if the material is low in wettability, a material having a non-smooth surface such as a marshmallow shape is not preferable because the wettability increases. However, by using the frame as described above, the end of the adhesive layer A1014 is formed as shown in FIG.
And the adhesive layer B1015
When bonding is performed by the method shown in FIG.
(D), it is prevented that a large amount remains in the area of the adhesive layer A1014.

As described above, the end of the adhesive layer A1014 can be formed without being thickened.
At the time of bonding by 1015, the face plate 1007 and the front plate 1012 can be bonded without a large amount of bubbles 1018 in the adhesive remaining in the adhesive layer A1014.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
Will be described with reference to FIGS. 6 and 7. FIG. Here, an image display panel is manufactured using a face plate 1007 made of soda lime glass similar to that of the first embodiment, and a multi-electron beam source, and an adhesive layer that is bonded to the transparent front plate 1012 is attached to the image display panel. 1013 will be described. As in the first embodiment, the transparent front plate 1012 is made of polycarbonate having a thickness of 1 mm. However, the present invention is not limited to this. For example, polycarbonate or acrylic having a thickness of about 0.5 mm or more is used. The object of the present invention can also be achieved by a transparent resin plate or tempered glass. Further, as the transparent adhesive used for the adhesive layer 1013, a photocurable adhesive was used as in the second embodiment, but it is needless to say that the present invention is not limited to this. May be used.

Next, the adhesive layer 1013 will be described.
As described in the fourth embodiment, the adhesive layer A101
When forming No. 4, if the end portion of the adhesive layer A1014 becomes thick, a large amount of air bubbles 10 remain in the adhesive layer A1014. Therefore, among the ends of the adhesive layer A1014, at least four corners are provided with a chamfer structure for escaping air when bonding using the adhesive layer B, so that bubbles 1018 are formed in the area of the adhesive layer A. Prevent it from remaining inside. The chamfered structure may be formed by cutting with a means such as a cutter after the adhesive is cured.

As described above, when the end of the adhesive layer A1014 becomes thick, a chamfered structure is provided at at least four corners. This allows the face plate 1007 and the front plate 1012 to be bonded together without causing a large amount of air bubbles 1018 in the adhesive to remain in the adhesive layer A 1014 when bonding with the bonding layer B 1015.

In the above embodiment, the front plate 1
Although polycarbonate was used as 012, it is needless to say that the invention is not limited to this, and acrylic, polypropylene (PP), polyethylene terephthalate (PE)
A transparent resin plate such as T) or a tempered glass may be used. In addition, when the front plate 1012 has a function of preventing reflection of external light, an image becomes difficult to see due to reflection of external light.
In addition, by providing the front plate 1012 with sufficient conductivity to prevent electrification, the front plate 1012 is charged, giving an unpleasant electric shock to the observer or adhering dust to make it difficult to see the image. Prevent that. Also, the front plate 101
2 or the adhesive layer 1013 may have a function of limiting the transmittance, reduce the reflectance of external light reaching the phosphor surface, and improve the contrast.

In this case, the face plate 100
7, an image display device using a surface conduction electron-emitting device having a front plate 1012 and an adhesive layer 1013 was prepared. However, the image display device is not limited to this, and is, of course, not limited to a cathode ray tube, a plasma display panel, and a field emission device. An image display device in which a transparent front plate 1012 is adhered to a face plate such as a display or a liquid crystal display can also be produced.

[0083]

As described above, according to the present invention, in the image display device, when the front plate and the face plate are adhered with the elastic adhesive, the display image is formed by mixing the spacer. It is possible to reduce the line speed of the image display panel by reducing the process of bonding the image display panel and the front plate without causing deterioration and preventing bubbles that adversely affect the image from being mixed in the bonding process. An effect such as shortening can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of an image display device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a face plate, an adhesive layer, and a front plate of the image display panel.

FIG. 3 shows a second and a third embodiment of the present invention.
FIG. 3 is a plan view of a front plate on which an adhesive layer A is formed, which is used for an image display panel.

FIG. 4 is a cross-sectional view showing an end portion of a face plate, an adhesive layer, and a front plate of the image display panel according to the second embodiment.

FIG. 5 is a schematic view showing a step of forming an adhesive layer A of the image display panel according to the third embodiment.

FIG. 6 shows fourth and fifth embodiments of the present invention.
It is sectional drawing which shows the face plate of an image display panel, the adhesive layer, and the edge part of a front plate.

FIG. 7 is a sectional view showing a face plate, an adhesive layer, and a front plate of an image display panel according to a fourth embodiment, and a plan view of a front plate on which an adhesive layer A is used for the image display panel. .

FIG. 8 is a perspective view of the image display device of the present invention in which a part of a display panel is cut away.

FIG. 9 is a plan view showing a phosphor array of a face plate of the display panel.

FIG. 10 is a diagram in which conventional surface conduction electron-emitting devices are connected by matrix wiring.

FIG. 11 is a partially cutaway perspective view of a display panel of a conventional image display device.

[Explanation of symbols]

 1001 Rear plate 1002 Electron beam source 1007 Face plate 1008 Phosphor film 1009 Metal back 1012 Transparent front plate 1013 Adhesive layer 1014 Adhesive layer A 1015 Adhesive layer B 1016 Adhesive liquid pool 1017 Image display area 1018 Bubbles 1020 High voltage power supply 1021 High voltage Introducing terminal 1022 Frame for preventing adhesive outflow on long side 1023 Roller 1024 Adhesive application nozzle 1025 Lamp house 1026 Chamfering structure 1027 Frame

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 31/12 H01J 31/12 C

Claims (12)

[Claims] An image display device comprising a transparent front plate bonded to a front surface of a glass face plate using a transparent adhesive to form an image display area. An image display device comprising: an adhesive layer A formed by curing; and an adhesive layer B for bonding the adhesive layer A and the face plate or the transparent front plate to each other. 2. The length of the long side of the front plate is Xf, the length of the short side is Yf, and the length of the long side of the image display area is Xf.
g, the length of the short side is Yg, the length of the long side of the adhesive layer A is Xa, and the length of the short side is Ya, so that Xf ≧ Xa> Xg and Yf ≧ Ya> Yg are satisfied. The image display device according to claim 1, wherein the image display device is set. 3. The length of the long side of the front panel is Xf, the length of the short side is Yf, and the length of the long side of the image display area is Xf.
g, the length of the short side is Yg, the length of the long side of the adhesive layer A is Xa, and the length of the short side is Ya, the size of the adhesive layer A is Xf>Xa> Xg 2. The image display device according to claim 1, wherein Yf>Ya> Yg is set. 4. The image display device according to claim 2, wherein the length Ya of the short side of the adhesive layer A is set so as to satisfy Yf>Ya> Yg. 5. When the thickness of the center of the adhesive layer A is Tc and the thickness of the adhesive layer A in the end region of each side is Te, the thickness is set to satisfy Tc ≧ Te. Claims 2 to
5. The image display device according to any one of 4. 6. The image display device according to claim 1, wherein a chamfered structure is provided at at least four corners among the ends of the adhesive layer A. 7. The image display device according to claim 1, wherein said front plate is a resin plate. 8. The image display device according to claim 1, wherein said front plate includes means for preventing reflection of external light. 9. The image display device according to claim 1, wherein the front plate has sufficient conductivity to prevent static electricity. 10. The image display device according to claim 1, wherein said front plate has a function of limiting transmittance. 11. A cathode ray tube characterized by using a face plate provided with the front plate according to claim 1. Description: 12. The cathode ray tube according to claim 11, wherein the cathode ray tube uses a surface conduction electron-emitting device.