JP2008300053A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ease an electric field concentration at the longitudinal end of a spacing member on a scanning line. <P>SOLUTION: This image display device is equipped with a front plate 21 having a metal back 15, a phosphor, and a black matrix 13 in a display region on its one side, a back plate 22 facing the front plate 21 while having a plurality of electron sources on its one side, a support frame 3 interposed between the front plate 21 and the back plate 22 to airtightly seal the peripheral fringe outside the display region by frit glass 9, and a plurality of spacers 4 interposed between the front plate 21 and the back plate 22. The longitudinal end of the spacer 4 extends to a region outside the display region, and the spacer 4 is closely brought into surface-contact with the metal back 15 by frit glass 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device including a plurality of electron sources and a phosphor.

  A matrix-type image display device (matrix-type display) can display an image by adjusting a voltage applied to each pixel by using a pixel near the intersection of mutually orthogonal electrode groups. As the matrix type image display device, a field emission display (hereinafter referred to as FED), an electroluminescence display (EL), a light emitting diode display (LED) and the like are known in addition to a liquid crystal display. For example, in the FED, an electron emission source (cold cathode source) is arranged for each pixel, electrons are emitted from the electron emission source and accelerated in a vacuum to which an electric field is applied, and then the phosphor is irradiated and irradiated. It makes the body emit light. That is, the FED has a configuration in which an anode substrate (front substrate) having a phosphor layer and a cathode substrate (back substrate) having an electron emission source are bonded and hermetically sealed at an interval of 0.5 mm or more. The sealed space between the two substrates is set to a lower pressure or vacuum state than the atmospheric pressure. Further, as electron emission elements for FED, field emission type elements using Spindt type or carbon nanotubes, metal / insulating layer / metal type emission elements (MIM elements), surface conduction type elements and the like are known.

  Further, Patent Document 1 discloses that a front frame, a rear substrate, a support frame that is between the front substrate and the rear substrate, and supports the periphery of the display area, and a space interposed between the front substrate and the rear substrate. -A support (support), a junction between the front substrate and the spacer, a junction between the rear substrate and the spacer, a junction between the front substrate and the support frame, and a connection between the rear substrate and the support frame. An image display device is disclosed in which a panel (assembled container) is formed by bonding frit glass to a bonding portion. This image display apparatus is configured such that electrons are emitted from each cold cathode element by applying a voltage to an electron emitting element (cold cathode source) formed on the rear substrate. Further, this image display device is configured such that emitted electrons are accelerated and collide with the front substrate by applying a DC high voltage of several kV introduced from outside the container to the metal back (anode) portion of the front substrate. The phosphors of the respective colors on the front substrate are excited by the accelerated electrons and emit light to display an image.

  Further, the spacer that supports the front substrate and the rear substrate is required to satisfy the following items mechanically and electrically. That is, the spacer needs to have sufficient mechanical strength to hold the front substrate and the rear substrate inside the display device at a uniform interval against the atmospheric pressure atmosphere outside the image display device. In addition, the spacer has electrical characteristics that minimize the electric field distortion of electrons between the front substrate and the back substrate due to the presence of the spacer, and does not affect the trajectory of electrons emitted from the cold cathode source. Is needed. In addition, it is necessary to suppress electric field concentration around the spacer due to electric field distortion and local discharge.

  Regarding mechanical strength, Patent Document 2 discloses a technique for improving the fixing strength of a spacer by adhering non-conductive frit glass to a terminal portion of a substantially rectangular parallelepiped spacer. Patent Document 3 discloses a technique for securing a large contact area with a frit glass bonded to a spacer by providing a chamfered portion at a corner of the spacer. According to this technique, the spacer can be reliably fixed, and the parallelism between the front substrate and the rear substrate can be maintained.

Further, Patent Document 4 discloses that an unnecessary light emission phenomenon caused by unnecessary electron emission is achieved by tilting the side surface of the spacer or by making the spacer trapezoidal, polygonal, or curved to alleviate electric field concentration at the end of the spacer. It has been proposed to suppress (stray phenomenon). In Patent Document 5, an insulating material is interposed between a cathode (electron emission source) and a spacer, a low resistance film is disposed on a spacer surface in contact with the insulating material, and an arbitrary potential is applied to the low resistance film. Thus, a technique for electrically and mechanically independent of the cathode is disclosed. In this way, the discharge current is avoided, and measures are taken to prevent destruction of the electron emission source due to the discharge current in the event of a discharge.
JP-A-11-317164 JP-A-10-144203 JP 2006-164684 A JP 2000-285829 A JP 2000-340142 A

  In the spacer interposed to hold the electrodes inside the image display device at a predetermined interval, an electrical triple point (hereinafter referred to as “TJ”) which is a boundary point between a crack, a protrusion, a minute gap, or a vacuum-electrode-spacer. In this case, a high electric field is easily formed. Spacer cracks, protrusions, or minute gaps can be made to a level with almost no problem by controlling the dimensional tolerance of the spacer and strictly controlling the surface of the spacer so that no defects or undulations occur. On the other hand, it is difficult to remove TJ due to the structure of the image display apparatus.

  When a high electric field is formed in TJ, unnecessary electrons are emitted from TJ due to an accelerating electric field between the front substrate and the rear substrate. Unnecessary electrons hit the spacer and finally reach the front substrate while increasing the number of secondary electrons by the secondary electron emission action of the spacer. The secondary electrons that have reached the front substrate cause a stray phenomenon that causes the phosphor to emit light. As a result, when an accelerating electric field is formed, there is a problem that a stray phenomenon may occur constantly in a place different from the place where light is originally intended to be emitted, and the image quality of the image display device may be significantly reduced. Furthermore, when the electric field strength is increased, local discharge occurs and the device may be broken.

In particular, the TJ at the longitudinal end portion (terminal portion) of the spacer disposed on the scanning line of the back substrate is more easily supplied with electrons than the anode (metal back) on the front substrate, and the external pressure (spacer Insufficient pressing pressure) is likely to cause insufficient adhesion to the electrode, and local electric field concentration is likely to occur compared to other locations, so that sufficient measures for electric field relaxation are required.
It should be noted that unless otherwise noted in the future description, a longitudinal end portion of a spacer (a spacing member) arranged on the scanning line of the rear substrate is simply referred to as a spacer terminal portion.

  Therefore, an object of the present invention is to provide an image display device that can alleviate electric field concentration at the end portion in the longitudinal direction of the spacing member on the scanning line.

  In order to solve the above problems, an image display device of the present invention has a front plate having an anode, a phosphor, and a black matrix in a display area on one side, and a plurality of electron sources on one side and facing the front plate. A back plate, a support frame that is interposed between the one side of the front plate and the one side of the back plate, and hermetically seals an outer peripheral portion outside the display area; and the front plate and the back plate A plurality of interval holding members interposed between the first and second intervals, wherein the interval holding member has a longitudinal end portion extending to an area outside the display area of the front plate. The contact surfaces of the spacing member and the anode are in close contact with each other.

  According to this, since the distance holding member has a longitudinal end portion extending to an area outside the display area of the front plate, the surface distance of the distance holding member between the anode and the back plate is small. become longer. On the other hand, since the anode voltage is constant, the potential distribution on the surface of the spacing member becomes rough. That is, the electric field strength on the surface of the spacing member is reduced.

  According to the present invention, the electric field concentration at the end portion in the longitudinal direction of the spacing member on the scanning line can be reduced.

(First embodiment)
FIG. 1 is a three-dimensional perspective view of an image display apparatus according to an embodiment of the present invention, and also shows the internal structure of the image display apparatus.
The image display device 100 includes a front substrate 1, a rear substrate 2, a support frame 3, a spacer 4 as a support, an electron-emitting device 5, a frit glass 7 as an adhesive member for bonding the spacer 4 and the front substrate 1, and a scanning line. 10, a data line 11, a phosphor 12, a black matrix 13, and an anode lead line 14. Although not shown, frit glass is also used for bonding the spacer 4, the support frame 3, and the back substrate 2. The phosphor 12 and the black matrix 13 formed in the display area on the inner surface of the front substrate 1 schematically show a lattice pattern that can be seen over the front substrate 1. The direction of the scanning line 10 is the X direction, the direction of the data line 11 is the Y direction, and the thickness direction is the Z direction.

  The back substrate 2 is preferably a glass plate or a ceramic plate, and is formed of an insulating substrate having a thickness of several millimeters. Further, the front substrate 1 is preferably a transparent glass plate, and is formed from a translucent substrate having a thickness of about several millimeters. Further, the support frame 3 inserted between the front substrate 1 and the rear substrate 2 and supporting the peripheral edge of the display area is made of a glass plate or a frit glass molded product and also serves as an outer frame. The support frame 3 is bonded and fixed between the front substrate 1 and the rear substrate 2 using frit glass, and the distance between the front substrate 1 and the rear substrate 2 is maintained at a predetermined dimension.

  In addition, a plurality of spacers 4 are disposed between the two substrates, and the distance between the front substrate 1 and the rear substrate 2 is maintained at a predetermined size even at the center of the image display device 100. The spacer 4 is erected on the surface of the scanning line 10 and is preferably a plate glass or ceramic having a plate thickness of about several hundred μm. For fixing the spacer 4 and the front substrate 1, frit glass 7 is used as an adhesive member.

The internal space of the image display device 100 assembled with the front substrate 1, the rear substrate 2, the support frame 3, and the spacer 4 is sealed in a reduced pressure state or a vacuum state, and the internal space is usually 10 ⁻⁴ to 10 ^−. It is held at about ⁵ Pa. The scanning lines 10 and the data lines 11 are arranged in a grid pattern, and the electron-emitting devices 5 having the MIM structure are formed in the vicinity of the respective intersection positions.

  An anode lead wire 14 is connected to an electrode (anode electrode) formed on the inner surface of the front substrate 1. By applying a DC high voltage of several kV to the anode lead wire 14, electrons emitted from the electron-emitting device 5 are accelerated by an electric field formed between the back substrate 2 and the front substrate 1, and the phosphor 12 Collide with. As a result, the phosphor 12 emits light and an image is displayed over the front substrate 1.

FIG. 2 is a partial cross-sectional view in which a part of the II ′ cross section along the Y-axis direction in FIG. 1 is cut out.
In FIG. 2, the image display device 100 includes a front plate 21, a back plate 22, and a spacer 4 that supports and opposes the front plate 21, and the front plate 21 and the spacer 4 are joined by a frit glass 7 that is an adhesive member. The spacer 4 is placed on the rear substrate 2, and the spacer 4 and the rear substrate 2 are not bonded by frit glass, and an atmospheric pressure outside the image display device 100 and a reduced pressure inside the image display device 100 or a vacuum pressure are used. It is pressed and fixed using differential pressure.

  The front plate 21 includes a front substrate 1, a phosphor 12, a black matrix 13, and a metal back 15. The phosphor 12 and the black matrix 13 are formed on the surface of the front substrate 1, and the phosphor 12 and the black matrix. A metal back 15 is formed on the surface 13. The metal back 15 that is an anode is formed of an aluminum film (Al film), and is led out to the outside by an anode lead wire 14.

  The back plate 22 includes the back substrate 2, the data line 11, the insulating AO film (Al oxide film) 20, the SiN film 19, and the scanning line 10. The data lines 11 are arranged on the surface of the back substrate 2, the insulating AO film 20 is formed on the surface of the data lines 11, the SiN film 19 is formed on the surface of the insulating AO film 20, and the surface of the SiN film 19 is formed. The scanning line 10 is formed so as to be orthogonal to the data line 11. In addition, a metal 5 a connected to the scanning line 10 is formed on the surface of the insulating AO film 20 at a predetermined distance l from the center line of the scanning line 10.

  An electron emitting element 5 having a MIM (metal-insulator-metal) structure is formed by the metal 5a, the insulating AO film 20, and the data line 11, and several thousand volts are applied to the anode lead line 14 connected to the metal back 15 as the anode. The scanning line voltage V1 (FIG. 3) which is a positive pulse voltage (for example, a pulse width of several tens of microseconds and a repetition interval of several tens of milliseconds) is applied to the metal 5a, and a negative pulse voltage is applied. When the data line voltage V2 (FIG. 3) is applied to the data line 11, electrons are emitted from the metal 5a by a tunnel phenomenon. Note that the data line voltage V2 is applied in order to remove the positively charged charges remaining due to the application of the scanning line voltage V1. Further, as the electron-emitting device 5, a surface conduction electron-emitting device, a diamond film, a graphite film, or a carbon nanotube may be used.

Next, the stray phenomenon in the conventional spacer 4 (the longitudinal direction is the same as or shorter than the length of the metal back 15) will be described. FIG. 4 is a partially enlarged view of the vicinity of the end portion of the spacer 4 and schematically shows the behavior of unnecessary electrons emitted from the TJ at the spacer end point k.
When primary electrons collide with the spacer 4 by the electric field in the x-axis direction, secondary electrons are newly emitted from the spacer 4 according to the secondary electron emission coefficient characteristics of the spacer 4. The energy of primary electrons colliding with the spacer 4 is several tens eV to several keV, and the secondary electron emission coefficient of the spacer 4 is generally larger than 1. For this reason, the number of secondary electrons emitted from the spacer 4 is larger than the incident primary electrons, and the surface of the spacer 4 is charged to the positive electrode due to the influence. Due to the positive charge of the spacer 4, the secondary electrons gain electrostatic force again toward the spacer 4, and charge the spacer 4 more and more while performing the hopping motion. At the spacer terminal point k of the spacer 4 in which the charge is accumulated, the electric field is increased to cause a stray phenomenon or finally to a local discharge.

  When the stray phenomenon occurs, the phosphor 12 always emits light, and the image quality of the image display device 100 is degraded. In addition, when local discharge occurs, a discharge current flows into the scanning lines 10 and the data lines 11 at a stretch, causing fatal damage such as line melting (disconnection) and possibly destroying the image display device 100 itself. For this reason, in this embodiment, the electric field relaxation in TJ of the spacer termination point k which becomes the starting point of a stray phenomenon or local discharge was aimed at by the measure shown below.

FIG. 5 is a schematic diagram showing the arrangement of the spacers 4 with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the spacer terminal portion with the xz plane as the front surface.
The spacer 4 is substantially plate-shaped, and is disposed on the metal back 15 formed on the black matrix 13 on the front plate 21 side, and is disposed on the scanning line 10 on the rear substrate 2 side. The length of the spacer 4 in the x-axis direction is longer than one side of the metal back 15 (generally a square shape that is slightly larger than the phosphor film-forming surface) on the front substrate 1, and both ends of the spacer 4 are metal. It protrudes to the outside of the back 15. That is, the spacer 4 has a longitudinal end portion extending to a region outside the display region of the front plate 21.

  Further, the contact surface between the spacer 4 and the front substrate 1 is bonded to the entire surface with a frit glass 7 to fix the spacer 4 at a predetermined position with high accuracy. Here, the spacer 4 is disposed in close contact with the front plate 21 and the back plate 22 so as not to generate a gap from the viewpoint of avoiding mechanical uneven load and preventing electric field concentration due to the minute gap. That is, the spacer 4 is bonded to the front plate 21 with the frit glass 7, the spacer 4 is placed on the scanning line 10, and the spacer 4 and the back plate 22 are not bonded with the frit glass. Thereby, the electric field distortion on the side of the back plate 22 where the speed of emitted electrons is small is reduced. The spacer 4 and the back plate 22 are brought into close contact with each other by using a pressing force due to a differential pressure between the vacuum pressure inside the image display device and the atmospheric pressure outside the image display device.

For convenience of description, the frit glass 7 is described as being translucent. The contact surface of the spacer 4 with the front substrate 1 and the four side surfaces adjacent to the contact surface in the vicinity of the front substrate 1 are covered with the frit glass 7. The volume resistivity of the frit glass 7 is desirably 10 ⁶ to 10 ¹² Ωcm or a range of 0.01 to 100 times the resistivity of the spacer.

  A broken line in FIG. 5 is an equipotential line 17 between the front substrate 1 and the rear substrate 2 and is formed when an electric field is applied to the inside of the image display device 100. The equipotential lines 17 are distorted at the end portion of the metal back 15 of the front plate 21 and have a flat distribution toward the back substrate 2, and the electric field at the TJ at the end portion of the spacer 4 is relaxed. That is, from the 100% potential end portion a (FIG. 6) of the spacer 4 to the spacer end point k (TJ of the end portion of the spacer 4 described above) which is a 0% potential portion that reaches the outer edge in the longitudinal direction of the spacer 4. Since the surface distance (c + d) can be increased, potential sharing by the resistance of the spacer 4 for sufficiently widening the interval between the equipotential lines 17 is possible, and the electric field strength at the point k is higher than when d = 0. Alleviated.

  In FIG. 5, the front substrate 1 and the rear substrate 2 and the support frame 3 are bonded by frit glass 9.

FIG. 6 is a relationship diagram of the electric field intensity E (pu) at the k point when the distance d (mm) in the x-axis direction between the metal back terminal portion a and the spacer terminal point k is a variable. . From the figure, it can be seen that the electric field strength at the point k decreases as the distance d increases.
Based on the above mechanism, by using a configuration in which the end portion of the spacer 4 protrudes to the outside of the metal back 15, the electric field at the TJ of the spacer end point k is relaxed. Further, by adhering the front substrate 1 and the spacer 4 with the frit glass 7, it is possible to avoid a mechanically biased load and to prevent electric field concentration due to minute gaps. Further, by placing the spacer 4 on the scanning line 10 of the back plate 22, electric field distortion on the back substrate 2 side where the electron velocity is smaller than that on the anode electrode side is reduced. As a result, it is possible to stably manufacture the image display device 100 in which no streak is generated.

(Second Embodiment)
In the first embodiment, all the contact surfaces of the spacer 4 with respect to the front plate 21 are bonded and fixed with the frit glass 7 to improve the arrangement position accuracy and adhesion of the spacer 4, but in the second embodiment, the front substrate 1 And the spacer 4 are closely connected by a pressing force.

  FIG. 7A is a schematic diagram showing the arrangement of the spacers 4 with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the terminal portion of the spacers 4 with the xz plane in front. In the figure, the image display device 110 increases the flatness of the substrate contact surface of the spacer 4, and the image forming member 6 (in FIG. 2, the phosphor 12, the black matrix 13, and the metal back 15 are formed on the surface of the front substrate 1. The structure is a thin film having a thickness of several tens of nanometers. As a result, the pressing force is uniformly applied to the contact surface of the spacer 4 so that the contact surface is free of voids.

Further, when the pressing force is insufficient and a space is formed between the spacer 4 and the front substrate 1, it is desirable to fill with a frit glass 7 as shown in FIG. The frit glass 7 is not provided between the forming member 6 and the spacer 4. Further, the contact surface between the spacer 4 and the back substrate 2 is fixed by the frit glass 8 in order to stand the spacer 4 upright. That is, the image display device 115 in FIG. 7B has a form in which the contact surface of the spacer 4 with the back substrate 2 is covered with the frit glass 8. The volume resistivity of the frit glass 8 is preferably in the range of 10 ⁶ to 10 ¹² Ωcm or 0.01 to 100 times the volume resistivity of the spacer 4. Other specifications are the same as in the first embodiment.

  The equipotential line 17 configured as described above is equivalent to that of the first embodiment, and the electric field at the TJ at the end of the spacer 4 is relaxed. As a result, it is possible to stably manufacture the image display devices 110 and 115 with little stray phenomenon.

(Third embodiment)
In the third embodiment, in addition to the configuration of the first embodiment, a conductive film 16 (FIG. 8) formed by sputtering on the entire portion of the contact surface of the spacer 4 that contacts the front substrate 1 that contacts the metal back 15. I have.

  FIG. 8 is a cross-sectional view showing the arrangement of the spacers 4 with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the terminal portion of the spacer 4 with the xz plane as the front. FIG. 9 is a perspective view showing a film forming state of a contact surface of the spacer 4 with the front substrate 1 before the image display device is assembled. In FIG. 8, since the image display device 120 includes the conductive film 16, it is possible to further prevent electrical instability in contact between the spacer 4 and the front substrate 1, and to mass-produce the image display device. On the other hand, it is more preferable. In the present embodiment, the conductive film 16 is formed only on the front substrate 1 side. However, if the conductive film 16 is formed on the entire contact surface between the scanning line 10 and the spacer 4 of the rear substrate 2, electrical instability is generated. Qualitative prevention is more thorough and effective.

  Here, in forming the conductive film 16 on the spacer 4, attention must be paid to the following points. If the conductive film 16 is formed on the spacer 4 far beyond the contact portion with the metal back 15, for example, if the conductive film 16 is formed on the entire bonding surface between the spacer 4 and the front substrate 1, 100% potential is applied to the front surface. It extends to the end of the spacer 4 in contact with the substrate 1. As a result, the electric field relaxation effect at the end of the spacer 4 of the back substrate 2 is lost. This corresponds to the electric field strength at the point k when d = 0 in FIGS. Therefore, it is desirable to form the conductive film 16 of the spacer 4 in contact with the front substrate 1 within the range of the metal back 15.

(Fourth embodiment)
In the fourth embodiment, as in the third embodiment, in addition to the configuration of the second embodiment, a conductive film 16 formed by sputtering is provided on the entire portion in contact with the metal back 15.
FIG. 10 is a cross-sectional view showing the arrangement of the spacers 4 with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the terminal portion of the spacer 4 with the xz plane as the front.
The effect of this embodiment obtained by such a configuration is the same as that of the third embodiment. The applied voltage is shared by the length d of the portion of the spacer 4 away from the image forming member 6, and the end portion of the spacer 4 is Electric field strength is reduced. In addition, since the spacer 4 and the back substrate 2 are bonded by the frit glass 8, the end portion of the spacer 4 does not warp even when the front substrate 1 is pressed by atmospheric pressure.

  According to the present embodiment, when the front substrate 1 and the spacer 4 are bonded with the frit glass 7 (FIG. 8), the high-resolution image such that the frit glass 7 exceeds (extends) the width of the black matrix 13. This is suitable for manufacturing a display device. In this embodiment, the conductive film 16 is formed only on the front substrate 1 side. However, if a conductive film (not shown) is formed on the entire contact surface between the scanning line 10 and the spacer 4 of the rear substrate 2, an electric uneasiness is formed. Qualitative prevention is more thorough and effective.

(Fifth embodiment)
In the fifth embodiment, the length of the spacer protruding outside the metal back 15 is suppressed as much as possible from the viewpoint of miniaturization of the image display device.
11 is a cross-sectional view showing the arrangement of the spacer 4 with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the terminal portion of the spacer 4 with the xz plane as the front, and FIG. 12 is a diagram before the image display device 140 is assembled. It is the schematic diagram which showed the film-forming state of the contact surface of the front substrate 1 of the spacer 4. In FIG. 11, the spacer 4 a of the image display device 140 includes a resistive film 18 having a volume resistivity larger than that of the spacer 4 a and lower than that of the frit glass 7 on the outer surface of the metal back 15, and performs electric field relaxation. ing. In the image display device 140, the conductive film 16 is provided on the surface of the metal back 15 to enhance electrical conductivity, and the layers of the conductive film 16 and the resistance film 18 and the front substrate 1 are bonded with the frit glass 7.

  In the spacer 4a of the fifth embodiment, the portion protruding outward from the metal back 15 is shortened. Further, as the length of the spacer 4a is shortened, the distances other than the image display portions of the front substrate 1 and the rear substrate 2 are shortened to the same extent, so that the image display device 140 is miniaturized. Further, by interposing the resistance film 18 on the contact surface between the front substrate 1 and the spacer 4a located outside the metal back 15, the resistance film 18 intervenes the potential sharing along the outer edge in the longitudinal direction of the spacer 4a. It is possible to increase the size in the region where it is formed and to decrease it in the region where only the spacer 4a is provided. As a result, the equipotential lines 17 (see FIG. 5) are sparser in the region of only the spacer 4a than the region in which the resistive film 18 is interposed, and the electric field at the TJ at the terminal end of the spacer 4 is relaxed, and the size is small Thus, the image display device 140 can be realized.

  In the present embodiment, the conductive film 16 is formed only on the front substrate 1 side. However, if the conductive film 16 is formed on the entire contact surface between the scanning line 10 and the spacer 4a of the rear substrate 2, the electrical instability may occur. Prevention is more thorough and effective.

(Sixth embodiment)
In the fifth embodiment, all the contact surfaces of the spacer 4a with respect to the front substrate 1 are bonded and fixed with the frit glass 7 to improve the arrangement position accuracy and adhesion of the spacer 4a, but in this embodiment, the second embodiment, As in the fourth embodiment, the front substrate 1 and the spacer 4 are brought into direct contact by pressing force, and the contact surface between the spacer 4 and the rear substrate 2 is fixed by the frit glass 8.

FIG. 13 is a cross-sectional view illustrating the arrangement of the spacers 4a with respect to the front substrate 1 and the rear substrate 2 in the vicinity of the end portion of the spacer 4a with the xz plane as the front surface. The volume resistivity of the frit glass 8 is desirably 10 ⁶ to 10 ¹² Ωcm or a range of 0.01 to 100 times the volume resistivity of the spacer 4a.

When a gap is formed between the spacer 4a and the front substrate 1 due to insufficient pressing force, it is desirable to fill with a frit glass 7 as shown in FIG. 7B. In that case, the volume resistivity of the frit glass 7 is set to a value larger than that of the resistance film 18.
In such a configuration, the equipotential lines 17 (see FIG. 5) formed when an electric field is applied to the inside of the panel are the same as those in the fifth embodiment, and the electric field at the TJ at the end of the spacer 4 is relaxed. Therefore, the image display device 150 with a small size can be realized.
In this embodiment, the conductive film 16 is formed only on the front substrate 1 side. However, it is more effective to form the conductive film 16 on the entire contact surface between the scanning line 10 and the spacer 4a of the rear substrate 2. is there.

(Seventh embodiment)
In each of the above embodiments, either the front substrate 1 or the back substrate 2 and the spacers 4 and 4a are fixed by the frit glasses 7 and 8 for bonding.
On the other hand, even when both the front substrate 1 and the rear substrate 2 and the spacer 4 are bonded and fixed, the electric field relaxation effect shown in the first to sixth embodiments can be obtained. In particular, it is a suitable measure when the surface of the spacer 4 is intentionally roughened to suppress charging or when it is covered with an uneven film. That is, if the surface of the spacer 4 is not flat, the adhesion between the spacer 4 and the front substrate 1 and the rear substrate 2 will be insufficient. It becomes easy to be caused. Therefore, an excellent image display device can be formed by covering those electrical and mechanical defects with the frit glasses 7 and 8 and fixing them. Further, a margin can be obtained in the manufacturing accuracy of the spacer 4, and the yield can be improved.

1 is a three-dimensional schematic diagram of an image display apparatus according to an embodiment of the present invention. It is a fragmentary sectional view of the image display apparatus which is one Embodiment of this invention. It is a waveform of the pulse voltage applied to MIM. It is a schematic diagram which shows the unnecessary electron emission which arises in the conventional spacer termination | terminus part, and the positive charge of a spacer. It is a fragmentary sectional view of a 1st embodiment, and is a side view including the longitudinal direction termination part of a spacer. It is a graph which shows the relationship between the electric field strength which arises in the spacer longitudinal direction termination | terminus part on a scanning line, and the distance from a metal back termination | terminus part to a spacer termination | terminus part. It is a fragmentary sectional view of 2nd Embodiment, and is a side view including the longitudinal direction termination | terminus part of a spacer. It is a fragmentary sectional view of 3rd Embodiment, and is a side view including the longitudinal direction termination | terminus part of a spacer. It is a perspective view which shows the film-forming state of the front substrate contact surface of the spacer before the assembly of the image display apparatus of 3rd Embodiment. It is a fragmentary sectional view of 4th Embodiment, and is a side view including the longitudinal direction termination | terminus part of a spacer. It is a fragmentary sectional view of 5th Embodiment, and is a side view including the longitudinal direction termination | terminus part of a spacer. It is a perspective view which shows the film-forming state of the front substrate contact surface of the spacer before the assembly of the image display apparatus of 5th Embodiment. It is a fragmentary sectional view of 6th Embodiment, and is a side view including the longitudinal direction termination | terminus part of a spacer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front substrate 2 Back substrate 3 Support frame 4, 4a Spacer (space | interval holding member)
5 Electron Emitting Element 6 Image Forming Member 7, 8, 9 Frit Glass 10 Scan Line 11 Data Line 12 Phosphor 13 Black Matrix 14 Anode Leader Line 15 Metal Back (Anode)
DESCRIPTION OF SYMBOLS 16 Conductive film 17 Equipotential line 18 Resistive film 19 SiN film 20 Insulating AO film 21 Front plate 22 Back plate 100,110,115,120,130,140,150 Image display apparatus

Claims (10)

A front plate having an anode, a phosphor, and a black matrix in a display area on one side;
A back plate having a plurality of electron sources on one side and facing the front plate;
A support frame that is interposed between the one side of the front plate and the one side of the back plate and hermetically seals a peripheral portion outside the display region;
A plurality of spacing members inserted between the front plate and the back plate;
An image display device comprising:
The spacing member has a longitudinal end portion extending to a region outside the display region of the front plate,
The contact surface between the spacing member and the anode is in close contact;
An image display device characterized by the above.   The image display device according to claim 1, wherein the spacing member is placed on the back plate and pressed by atmospheric pressure.   The image display device according to claim 1, wherein a conductive layer is further formed on a contact surface between the spacing member and the anode. The front plate is formed such that the anode, the phosphor, and the black matrix have a film thickness on the surface of the front substrate,
4. The image display device according to claim 1, wherein a resistance film is formed on a portion of the interval holding member outside the display area. 5.   The image display device according to claim 4, wherein a volume resistivity of the resistive film is equal to or higher than a volume resistivity of the spacing member. The contact surface between the peripheral portion of the display area of the front substrate and the resistance film is fixed by an adhesive,
The image display device according to claim 4, wherein a volume resistivity of the resistive film is lower than a volume resistivity of the adhesive. In the front plate, the anode, the phosphor, and the black matrix image forming member are formed with a step on the surface of the front substrate,
6. The peripheral portion of the display area of the front substrate and the contact surface between the image forming member and the spacing member are fixed over the entire surface with an adhesive. The image display device according to item. In the front plate, the anode, the phosphor, and the black matrix image forming member are formed with a step on the surface of the front substrate,
2. The image forming member and the gap holding member are in contact with each other, and the gap holding member and an outer peripheral portion of the display area of the front substrate are fixed by an adhesive. The image display device according to claim 5. The image display device according to claim 7 or 8, wherein the adhesive has a volume resistivity in a range of 10 ⁶ to 10 ¹² Ωcm.   The image display according to claim 7 or 8, wherein a volume resistivity of the adhesive for fixing the spacing member is in a range of 0.01 to 100 times a volume resistivity of the spacing member. apparatus.

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