JP2006221945A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device capable of keeping an interval to be a specified value while maintaining hermeticity in the closed space even if the interval is relatively large between a front panel 1 and a rear panel 2. <P>SOLUTION: The image display device comprises the rear panel 1, front panel 2, and an outer frame 3. The outer frame 3 consists of a plurality of split wall members 3X1, 3X2, 3Y1, 3Y2, 3C1 and 3C4. A slope 3P is formed at least at a part of engagement between adjoining wall members, with the angle of intersection between the normal of the slope 3P and that of the rear panel 1 or acute front panel 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display device, and more particularly to a flat panel type image display device in which an internal sealed space is hermetically maintained at a lower pressure than the outside, and more particularly to a structure of an outer frame.

  Conventionally, a color cathode ray tube has been widely used as a display device excellent in high luminance and high definition. However, with the recent increase in image quality of information processing apparatuses and television broadcasting, there is an increasing demand for a flat display (panel display) that has high luminance and high definition characteristics and is lightweight and space-saving.

  As typical examples, liquid crystal display devices, plasma display devices and the like have been put into practical use. In particular, various types of panel display devices such as a field emission display (hereinafter also referred to as an FED) and an organic EL display characterized by low power consumption that can achieve high luminance are close to practical use.

  Among such panel type display devices, in an image display device in which the sealed space between the two panels of the front panel and the rear panel is set to a pressure lower than or equal to the atmospheric pressure, the gap between the two panels is set to a predetermined value. While holding, it is necessary to maintain the airtightness of the sealed space. In order to form a sealed space in the opposing gap between the two panels, it is necessary to insert a spacing member (also referred to as a spacer or a partition) between the peripheral inner walls of both panels.

  The spacing member can be obtained by applying an adhesive (such as frit glass) by application using a dispenser or multiple printing. However, when the distance between the two panels is large, it is difficult to maintain the desired gap between the gap holding members by such means because the adhesive flows or deforms. take time.

  For example, in an FED in which the distance between both substrates is large, a glass plate is used as a panel material, and the gap between the sealed spaces formed between these glass plates (front panel and back panel) is about 1 mm or more. The above-mentioned gap is formed by fixing an outer frame made of a glass material having a necessary thickness to the front panel and the rear panel with an adhesive.

  FIG. 9 is a schematic cross-sectional view illustrating a configuration example of a field emission display device (FED) as an example of this type of panel-type image display device. In this field emission display device, inner peripheral walls of the back panel 1 and the front panel 2 are fixed by an outer frame 3, and the inside surrounded by the outer frame is a low-pressure or vacuum sealed space. The outer frame 3 has a thickness of about 3 to 10 mm and a height of about 1 to 5 mm, and is fixed to the back panel 1 and the front panel 2 with an adhesive 4.

  A cathode electrode 5, an insulating layer 6 and a grid electrode 7 are formed on the inner surface of the rear panel 1, and an anode electrode 8 and a phosphor 9 are formed on the inner surface of the front panel 2. A pair of cathode electrode 5 and phosphor 9 constitutes one pixel, and in the case of color display, a group of three different phosphors that emit light of different colors (generally, red, green, and blue). One color pixel is formed. A partition wall 10 made of an insulating material is provided between the pixels.

  In this type of FED, an electron beam emitted from the cathode electrode 5 is controlled by image information applied to the grid electrode 7 and is projected onto the phosphor 9 laminated on the anode electrode 8 to develop a predetermined color.

  FIG. 10 is a developed perspective view schematically illustrating a conventional configuration example of the back panel, the front panel, and the outer frame in FIG. 9. The outer frame 3 provided between the back panel 1 and the front panel 2 has an integral frame shape, and a frit glass is preferably bonded to each surface of the outer frame 3 facing the inner surfaces of the back panel 1 and the front panel 2. The material 3a and the adhesive material 3b are applied and fixed by means such as printing, and the internal space is a low-pressure or vacuum sealed space.

  In addition, as a conventional document disclosing this kind of image display device, the following Patent Document 1 and Patent Document 2 can be cited.

JP 2000-21335 A JP-A-8-227872

  In the above prior art, in the structure in which the two panel glass plates are bonded and fixed using the outer frame, when the image display device is enlarged, it is easily damaged during handling, and waste of the material occurs. As a result, it becomes expensive.

  In order to avoid this, it is conceivable to divide the outer frame into a plurality of members and combine and bond them together. However, the joined portions of the divided members after the adhesion are likely to leak, making it difficult to maintain airtightness. Resolving this has become one of the problems in the technical field.

  The object of the present invention is to solve the above-mentioned problems of the prior art and maintain the gap at a predetermined value even when the gap between the two panel glass plates is relatively large, and maintain the hermeticity of the sealed space. An object of the present invention is to provide an image display device that can be used.

  In order to achieve the above object, an image display device according to the present invention includes a front panel, a rear panel, and an outer frame, and the front panel, the rear panel, and the outer frame are fixed by a bonding material, and the front panel and the rear panel are provided. And an image display device in which the enclosed space enclosed by the outer frame is at a lower pressure than the outside, and the outer frame is composed of a plurality of wall members, and at least some of the adjacent wall members are mutually connected. Each of the engaging portions has an end portion of at least a part of the joining surface, and this end portion has an acute intersection angle between the normal line of the inclined surface and the normal line of the front panel or the rear panel, and the ends engaging with each other. The parts are fixed through a bonding material between them.

  In another image display device according to the present invention, preferably, in the above-described configuration, the end portions are perpendicular to the front panel or the back panel, and the end portions engaged with each other are fixed via a bonding material. It is characterized by that.

  With this configuration, in the sealing process, a bonding material is applied to the end portions of the outer frame that engage with each other, pressure is applied from the direction of the front panel and the rear panel, and the bonding material is melted by heating to a high temperature. In this case, since the intersection angle between the normal line of the slope end and the normal line of the front panel or the back panel is an acute angle, pressure is applied between the end parts, and the bonding material between them tends to spread throughout. Therefore, it can be surely sealed, it is difficult for internal pressure to leak, and the airtightness of the sealed space can be maintained.

  In addition, when the sealed space is at a lower pressure or vacuum than the external atmosphere, the engaging slopes receive pressure from the back panel and the front panel side, respectively, so that the engagement portion is less likely to leak, Airtightness is maintained.

  Further, it is preferable that the bonding material protrudes from between the slope portions that are engaged with each other because leakage is less likely to occur.

  The low-pressure sealed space may be a vacuum.

  The wall member is preferably made of the same material as the front panel or the back panel, the wall member is preferably a glass material, and the bonding material is preferably frit glass.

  The present invention is particularly effective when applied to an FED in which a field emission element is formed on a back panel and a gap between the front panel and the back panel is 1 mm or more.

  The wall member has slopes at both ends thereof, one of the slopes at both ends is a slope facing the front panel, and the other of the slopes at both ends is a slope facing the back panel; It is preferable to do this.

  The wall member may have slopes at both ends, and both slopes may be slopes facing the front panel, or both slopes may be slopes facing the back panel.

  The inclined surface portions that engage with each other may have at least a portion that is engaged with each other.

  Note that the present invention is not limited to the above-described configuration and the configuration of the embodiments described later, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

  According to the present invention, in the sealing step, the joining material is applied to the slope portions of the outer frame that engage with each other, pressure is applied from the direction of the front panel and the back panel, and the joining material is melted by heating to a high temperature. In this case, the angle between the normal line of the slope and the normal line of the front panel or the back panel is an acute angle, so that pressure is applied to the slope parts and the bonding material between them is easy to spread throughout. Thus, it is difficult to leak the internal pressure, and an extremely excellent effect that the airtightness of the sealed space can be maintained is obtained.

  In addition, when the sealed space is set to a lower pressure or vacuum than the external atmosphere, the engaging slopes receive pressure from the back panel and the front panel, respectively, so that the engagement portion is less likely to leak, An extremely excellent effect that airtightness is maintained is obtained.

  Further, since the outer frame is composed of a plurality of wall members, there is no waste in material collection, and an extremely excellent effect is obtained that an inexpensive image display device can be obtained as a whole.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings of the examples. Although the present invention is applied to the FED here, it can be applied to other similar image display apparatuses or similar devices.

  FIG. 1 is an explanatory diagram for explaining the configuration of a first embodiment of an image display device according to the present invention, and FIG. 1 (a) is a developed perspective view schematically showing a configuration example of a back panel, a front panel, and an outer frame. FIG. 1, FIG. 1B and FIG. 1C are explanatory views of the shape of the joint surface formed on the outer frame.

  In this image display device, the back panel 1 and the front panel 2 are each composed of a glass plate, and the outer frame 3 is composed of a glass material. Here, various components formed on the inner surfaces of the back panel 1 and the front panel 2 are not shown.

  In FIG. 1, an outer frame 3 having a predetermined thickness is interposed between outer peripheral edges of the back panel 1 and the front panel 2 and fixed with a certain gap with an adhesive to form a sealed space inside. As shown in FIG. 3A, the outer frame 3 is divided into a plurality of wall members 3X1, 3X2, 3Y1, 3Y2, 3C1 to 3C4.

  A slope 3P is formed in each of the portions where the wall members 3X1, 3X2, 3Y1, 3Y2, 3C1 to 3C4 engage with each other. Then, as shown in FIG. 1B, the intersection angle θ between the normal line AA standing on the slope 3P and the normal line BB standing on the back panel 1 or the front panel 2 is an acute angle. . In FIG. 1C, the crossing angle θ between the normal AA and the normal BB standing on the back panel 2 is set to zero.

  2 is a three-plane view showing the plane and two side surfaces of the outer frame in FIG. 1, FIG. 2 (a) is a plan view, FIG. 2 (b) is a short-side side view, and FIG. A long side side view is shown. The reference numerals in the figure correspond to the same parts as in FIG.

  As shown in FIG. 2, the outer frame 3 of the present embodiment includes two long side wall members 3X1, 3X2, two short side wall members 3Y1, 3Y2, and four corner wall members 3C1, 3C2, 3C3, 3C4. And are divided respectively.

  The parts to be divided need not be symmetrical or vertically symmetrical. For example, when an exhaust pipe is provided on the outer frame for evacuation, the position may be selected in consideration of the installation position of the exhaust pipe.

  An inclined surface 3P having the angle described with reference to FIGS. 1B and 1C is formed at the engaging portion of each wall member with the adjacent wall member. Between these engaging slopes 3P, frit glass is interposed and fixed by adhesion.

  FIGS. 3A and 3B are trihedral views illustrating the detailed configuration of the corner wall member 3C constituting the outer frame 3 in the present embodiment, FIG. 3A is a plan view, and FIG. 3B is a short side view. FIG. 3C is a side view of the long side. The reference numerals in the figure correspond to the same parts as in FIG.

  Needless to say, the outer frame 3 is bonded to the rear panel 1 and the front panel 2 with frit glass similar to the above, and the rear panel 1, the front panel 2, and the outer frame 3 are integrally sealed. A sealed space is formed inside.

  Although not shown, this sealed space is subjected to low pressure or vacuum processing in the manufacturing process of the image display device.

  According to the present embodiment, in the sealing step, a bonding material is applied to the sloped surface 3P portion of the outer frame 3 that is engaged with each other, pressure is applied from the direction of the front panel 2 and the back panel 1, and the bonding material is heated to a high temperature. When melted, since the intersection angle between the normal line of the slope 3P and the normal line of the front panel 2 or the back panel 1 is an acute angle, pressure is applied to the slope 3P parts, and the bonding material in between Since it is easy to spread over the whole, it can be surely sealed, the internal pressure is difficult to leak, and the airtightness of the sealed space can be maintained.

  On the other hand, when the engaging portions of the outer frame 3 do not have the inclined surface 3P portion and are perpendicular to the front panel 2 and the rear panel 1, the front panel 2 is applied when a bonding material is applied therebetween. Even if pressure is applied from the direction of the rear panel 1, no pressure is applied to the joint portion and the joining material between them, so that it does not spread well and there is a possibility that a gap is formed in the joint portion. Needs to be performed in advance or pressure bonded to the joining surface.

  In addition, when the sealed space is at a lower pressure or vacuum than the external atmosphere, the engaging slopes receive pressure from the back panel 1 side and the front panel 2 side, respectively, so that the engaging portion is less likely to leak and the sealed space is sealed. The airtightness of the space is maintained.

  Further, since the outer frame 3 is constituted by a plurality of wall members, there is no waste in material collection, and an inexpensive image display device as a whole can be obtained.

  FIG. 4 is an explanatory diagram for explaining the configuration of the image display apparatus according to the second embodiment of the present invention. In this embodiment, an outer frame 3 similar to that shown in Embodiment 1 in FIG. 1 is divided into two long side wall members 3X1 and a long side wall member 3X2.

  The part to be divided is the central part of the short side, but this part does not need to be the center of the short side and need not be symmetrical. For example, when an exhaust pipe is provided in the outer frame 3 for evacuation, the position may be selected in consideration of the installation position of the exhaust pipe.

  Slope 3P is formed in each of the part which each wall member 3X1 and wall member 3X2 adjoin and mutually engages. The intersecting angle θ between the normal line raised on the slope 3P and the normal line raised on the back panel 1 or the front panel 2 is zero to acute.

  Between these engaging slopes, frit glass is interposed and fixed. The outer frame 3 is bonded to the rear panel 1 and the front panel 2 with frit glass similar to the above, and the rear panel 1, the front panel 2, and the outer frame 3 are integrated to form a sealed space inside. .

  This sealed space is subjected to low pressure or vacuum processing in the manufacturing process of the image display device as in the first embodiment.

  According to the present embodiment, in the sealing step, a bonding material is applied to the sloped surface 3P portion of the outer frame 3 that is engaged with each other, pressure is applied from the direction of the front panel 2 and the back panel 1, and the bonding material is heated to a high temperature. When melted, since the intersection angle between the normal line of the slope 3P and the normal line of the front panel 2 or the back panel 1 is an acute angle, pressure is applied to the slope 3P parts, and the bonding material in between Since it is easy to spread over the whole, it can be surely sealed, the internal pressure is difficult to leak, and the airtightness of the sealed space can be maintained.

  On the other hand, when the engaging portions of the outer frame 3 do not have the inclined surface 3P portion and are perpendicular to the front panel 2 and the rear panel 1, the front panel 2 is applied when a bonding material is applied therebetween. And even if pressure is applied from the direction of the back panel 1, no pressure is applied to the joint part and the joint material between them, so that it does not spread well and there is a possibility that a gap is formed in the joint part. End up.

  In addition, when the sealed space is set to a pressure or vacuum lower than the external atmosphere, the engaging slopes 3P receive pressure from the back panel 1 side and the front panel 2 side, respectively, so that it is difficult for the engaging portion to leak. The airtightness of the sealed space is maintained.

  Further, since the outer frame 3 is constituted by a plurality of wall members, there is no waste in material collection, and an inexpensive image display device as a whole can be obtained.

  In the present embodiment, the outer frame 3 is described as being divided on the short side, but there is no problem even if the long side is divided.

  FIG. 5 is an explanatory diagram illustrating the configuration of the image display apparatus according to the third embodiment of the present invention. In this embodiment, an outer frame 3 similar to that described with reference to FIGS. 1 and 4 is divided at four corners, and a long side wall member 3X1, a long side wall member 3X2, a short side wall member 3Y1, and a short side wall. It is divided into the member 3Y2.

  Slopes 3P are formed in each of the long side wall members 3X1, 3X2 and the short side wall members 3Y1, 3Y2 adjacent to each other and engaging with each other. The intersection angle between the normal line raised on the slope 3P and the normal line raised on the back panel 1 or the front panel 2 is an acute angle.

  Between these engaging slopes, frit glass is interposed and fixed. The outer frame 3 is bonded to the rear panel 1 and the front panel 2 with frit glass similar to the above, and the rear panel 1, the front panel 2, and the outer frame 3 are integrated to form a sealed space inside. .

  The sealed space is subjected to low pressure or vacuum processing in the manufacturing process of the image display device as in the first and second embodiments.

  According to the present embodiment, in the sealing process, a bonding material is applied to the slope portions of the outer frame that are engaged with each other, pressure is applied from the direction of the front panel and the back panel, and the bonding material is melted by heating to a high temperature. Since the intersection angle between the normal line of the slope and the normal line of the front panel 2 or the back panel 1 is an acute angle, pressure is applied to the slope 3P portions, and the bonding material between them is easily spread throughout. Therefore, it can be surely sealed, it is difficult for internal pressure to leak, and the airtightness of the sealed space can be maintained.

  On the other hand, when the engaging portions of the outer frame 3 do not have the inclined surface 3P portion and are perpendicular to the front panel 2 and the rear panel 1, the front panel 2 is applied when a bonding material is applied therebetween. In addition, even if pressure is applied from the direction of the back panel 1, no pressure is applied to the joining portion and the joining material between them, so that it does not spread well and there may be a gap in the joining portion. Or pressure bonding is required.

  Further, when the sealed space is set to a pressure or vacuum lower than the external atmosphere, the engaging slopes 3P receive pressure from the back panel 1 side and the front panel 2 side, respectively, so that it is difficult for the engaging portion to leak, The airtightness of the sealed space is maintained.

  Further, since the outer frame 3 is constituted by a plurality of wall members, there is no waste in material collection, and an inexpensive image display device as a whole can be obtained.

  FIG. 6 is an explanatory diagram for explaining the configuration of the image display apparatus according to the fourth embodiment of the present invention. Moreover, FIG. 7 is a three-plane view showing the plane and two side surfaces of the outer frame in Embodiment 4 of the present invention, FIG. 7 (a) is a plan view, FIG. 7 (b) is a short-side side view, FIG. 7 (c) shows a side view of the long side.

  In the present embodiment, the outer frame 3 is divided into a plurality of wall members 3X1, 3X2, 3Y1, 3Y2, 3C1 to 3C4 as in the first embodiment of FIG. The difference from the first embodiment is in the direction in which the slopes 3P provided at both ends of the wall member are facing.

  In the first embodiment, as shown in FIG. 1A, each of the wall members 3X1, 3X2, 3Y1, and 3Y2 has slopes 3P at both ends thereof, and both slopes 3P at both ends face the rear panel 1. The slope is facing. In addition, that the inclined surface 3P faces the back panel 1 means that the surface of the inclined surface is opposed to the back panel 1 instead of the front panel 2.

  Similarly, the wall members 3C1 to 3C4 engaged therewith have slopes 3P on both end faces thereof, and both slopes 3P are slopes facing the front panel 2. That is, the slopes 3P formed at both ends of each wall member are both sloped in the same direction. In this case, when a force is applied between the back panel 1 and the front panel 2, the wall member 3C2 may receive a force that pushes the wall member 3X2 and the wall member 3Y1 diagonally outward of the frame.

  On the other hand, in this embodiment, as shown in FIG. 7, the wall members 3X1, 3X2, 3Y1, 3Y2, 3C1 to 3C4 are the same in that they have slopes 3P at both ends, but the slopes at both ends are the same. One of them is a slope facing the front panel 2, and the other of the slopes at both ends is a slope facing the back panel 1. For example, when viewing the wall member 3X2, the slope 3P of the wall member 3X2 at the end on the side engaged with the wall member 3C2 is a slope facing the rear panel 1.

  On the other hand, the slope 3P of the wall member 3X2 at the end on the side engaged with the opposite wall member 3C4 is a slope facing the front panel 2. The same applies to the other wall members. In this way, when the slopes at both ends of the wall member are slopes facing in opposite directions, when a force is applied between the back panel 1 and the front panel 2, the force applied to each wall member goes around the frame. It will take direction. Thereby, the force which pushes a wall member to the outer side direction of a frame becomes weak.

  Since the other points are the same as those of each of the embodiments described so far, the duplicate description is omitted. In addition, although the present Example demonstrated in the Example which changed the direction of the slope of Example 1, you may apply to Example 2 and Example 3. FIG. In this case as well, the direction of the inclined surfaces at both ends of the wall member may be reversed.

  FIG. 8 is an explanatory diagram for explaining the configuration of the fifth embodiment of the image display device according to the present invention. In the present embodiment, a modification of the shape of the slope 3P of the wall member applicable to the engaging portion of the slope 3P of each embodiment described so far will be described.

  FIG. 8 is an enlarged view of a main part when the shape of the engaging portion of the wall members 3Z1 and 3Z2 used in the outer frame 3 is enlarged and viewed from the side as shown in FIGS. 2 (b) and 2 (c). The wall members 3Z1 and 3Z2 have the same slope 3P as in the previous embodiments. And the slope parts which mutually engage are the shape which has the unevenness | corrugation which mutually meshes at least in part. Thereby, even when force is applied from the back panel 1 and the front panel 2, the possibility that the wall members 3Z1 and 3Z2 are displaced in the left-right direction in the drawing can be reduced.

  Although the present invention has been described based on each embodiment as described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the technical idea of the present invention. is there. For example, the number of divisions and divisions of the outer frame are not limited to the above-described embodiments, and can be arbitrarily selected according to the size of the image display device. Without forming the slope, the above slope may be formed only on the portion where there is a risk of leakage in consideration of the size of the long side or the short side, and other portions are engaged with each other by forming a butt or a step. May be.

  That is, when there are a plurality of engaging portions, the present invention may not be applied to all engaging portions, and the present invention may be applied to only some engaging portions. However, not only when the entire surface is a slope according to the present invention, but only a part may be a slope according to the present invention, and the other part may have a different shape.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of Example 1 of the image display apparatus by this invention, Fig.1 (a) is the expansion | deployment perspective view which illustrates typically the structural example of a back panel, a front panel, and an outer frame, FIG.1 (b), FIG. 1C is an explanatory diagram of the shape of the slope formed on the outer frame. FIG. 2 is a three-plane view showing a plane and two side surfaces of the outer frame in Embodiment 1 of the present invention, FIG. 2A is a plan view, FIG. 2B is a short-side side view, and FIG. It is a long side side view. FIG. 3A is a three-view diagram illustrating a detailed configuration of a corner wall member that constitutes an outer frame in Embodiment 1 of the present invention, FIG. 3A is a plan view, FIG. 3B is a short-side side view, and FIG. (C) is a side view of the long side. It is an expansion | deployment perspective view explaining the structure of Example 2 of the image display apparatus by this invention. It is an expansion | deployment perspective view explaining the structure of Example 3 of the image display apparatus by this invention. It is an expansion | deployment perspective view explaining the structure of Example 4 of the image display apparatus by this invention. FIG. 7A is a plan view of the outer frame and two side surfaces in Example 4 of the present invention, FIG. 7A is a plan view, FIG. 7B is a short side view, and FIG. It is a long side side view. It is principal part sectional drawing of the engaging part explaining the structure of Example 5 of the image display apparatus by this invention. It is a schematic cross section which shows the structural example of the field emission display (FED) as an example of a panel type image display apparatus. FIG. 10 is a developed perspective view schematically illustrating a conventional configuration example of a back panel, a front panel, and an outer frame in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Back panel, 2 ... Front panel, 3 ... Outer frame, 3X1 ... Wall member, 3X2 ... Wall member, 3Y1 ... Wall member, 3Y2 ... Wall member, 3C1 ... Wall member, 3C2 ... Wall member, 3C3 ... Wall member, 3C4 ... Wall member, 3P ... Slope, 3a ... Adhesive, 3b ... Adhesive, 4 .... Adhesive, 5 ... cathode electrode, 6 ... insulating layer, 7 ... lattice electrode, 8 ... anode electrode, 9 ... phosphor, 10 ... partition.

Claims (17)

A front panel, a back panel, and an outer frame, wherein the front panel, the back panel, and the outer frame are fixed by a bonding material, and the interior is enclosed by the front panel, the back panel, and the outer frame. An image display device in which the space has a lower pressure than the outside,
The outer frame is constituted by at least one wall member, and has at least a part of end faces in each of the engaging parts of at least a part of the adjacent wall members. The angle of intersection between the line and the normal of the front panel or the back panel is a right angle plane or a slope,
2. The image display device according to claim 1, wherein the end surfaces engaged with each other are fixed via the bonding material therebetween.   The image display device according to claim 1, wherein the bonding material protrudes from between the end surfaces engaged with each other.   The image display device according to claim 1, wherein the sealed space is a vacuum.   The image display device according to claim 1, wherein the wall member is made of the same material as the front panel or the back panel.   The image display device according to claim 1, wherein the wall member is a glass material.   6. The image display device according to claim 1, wherein the bonding material is frit glass.   The image display device according to claim 1, further comprising a field emission device on the back panel.   The image display device according to any one of claims 1 to 7, wherein a gap between the front panel and the back panel is 1 mm or more.   The wall member has the right-angle surfaces at both ends thereof, and one of the right-angle surfaces at both ends is a surface facing the end surface of the wall member, and the other of the right-angle surfaces at both ends is the wall. 9. The image display device according to claim 1, wherein the image display device is a right-angled surface facing an end surface of the member.   The wall member has the inclined surfaces at both ends thereof, and one of the inclined surfaces at both ends is an inclined surface facing the front panel, and the other of the inclined surfaces at the both ends faces the back panel. The image display device according to claim 1, wherein the image display device is a facing slope.   The wall member has the inclined surfaces at both ends thereof, and both inclined surfaces are inclined surfaces facing the front panel, or both inclined surfaces are directed toward the back panel. The image display device according to claim 1, wherein the image display device is a slope.   The image display device according to any one of claims 1 to 10, wherein the right-angled surfaces or inclined surface portions that are engaged with each other have irregularities that at least partially mesh with each other.   9. The image display device according to claim 1, wherein the wall member has a circular cross section.   9. The image display device according to claim 1, wherein the wall member has an elliptical cross section.   9. The image display device according to claim 1, wherein the wall member has an oval cross section.   The image display device according to any one of claims 1 to 8, wherein the wall member has a cross section of two planes and two arcs. 9. The image display device according to claim 1, wherein the wall member has at least one arc in cross section.

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