JP2008078072A - Image display device - Google Patents

Abstract

In a flat-type image display device, electric field concentration on an end face of a high voltage application portion of a phosphor screen is reduced to prevent discharge.
A back substrate 1 having a plurality of signal wirings 8 and 9 and an electron source 10 on a glass substrate, and a phosphor film 18 comprising a phosphor layer 15, a BM film 16 and a metal back 17 on the glass substrate. A flat-type image display device comprising a front substrate 2 and a frame 3 interposed between the rear substrate 1 and the front substrate 2, the inner surface direction of the frame 3 from the end of the phosphor film 18. The conductive film 14 extending to the surface was disposed.
[Selection] Figure 2

Description

  The present invention relates to a self-luminous flat panel image display device, and more particularly to an image display device in which thin film electron sources are arranged in a matrix.

  As one of self-luminous flat panel displays (FPDs) having electron sources arranged in a matrix, a field emission image display (FED: Field Emission Display) using a small and stackable cold cathode or an electron emission type An image display device is known. These cold cathodes include spindt type electron sources, surface conduction type electron sources, carbon nanotube type electron sources, metal-insulator-metal (MIM) type metal-insulator-metal, and metal-insulator-semiconductors. There are stacked MIS (Metal-Insulator-Semiconductor) type or metal-insulator-semiconductor-metal type electron sources.

  A general self-luminous FPD includes a rear panel having the electron source as described above on a rear substrate made of a glass plate, a phosphor layer, and electrons emitted from the electron source to the phosphor layer. A front panel having an anode for forming an electric field on the front substrate made of a glass plate, and a frame body that holds internal spaces facing each other at a predetermined interval. The display space to be formed is configured to be kept in a vacuum state, and the display panel is configured by combining a drive circuit.

  The back panel of the back panel has a plurality of scanning signal wirings extending in one direction and arranged in parallel in another direction orthogonal to the one direction and sequentially applying a scanning signal in the other direction. Furthermore, a plurality of image signal wirings arranged in the one direction so as to extend in the other direction and intersect the scanning signal wirings are provided on the rear substrate. In addition, the electron source is provided near each intersection of the scanning signal wiring and the image signal wiring. The scanning signal wiring and the electron source are connected by a feeding electrode, and current is supplied from the scanning signal wiring to the electron source. The configuration is general.

  Further, the individual electron sources are paired with a corresponding phosphor layer to constitute a unit pixel. Usually, one pixel (color pixel, pixel) is composed of unit pixels of three colors of red (R), green (G), and blue (B). In the case of a color pixel, the unit pixel is also called a sub-pixel (sub-pixel).

  In addition to the above-described configuration, in the image display device as described above, a plurality of spacing members (spacers) are arranged and fixed in a display area surrounded by the frame body between the rear panel and the front panel, Is maintained at a predetermined interval in cooperation with the frame. This spacer is generally composed of a plate-like body formed of an insulating material such as glass or ceramics or a member having some conductivity, and is usually installed at a position where the operation of the pixel is not hindered for each of a plurality of pixels. .

The frame body serving as a sealing frame is fixed to the inner peripheral edge of the back substrate and the front substrate with a sealing member such as frit glass, and the fixing portion is hermetically sealed to form a sealing region. The degree of vacuum inside the display area formed by both substrates and the frame is, for example, about 10 ⁻⁵ to 10 ⁻⁷ Torr.

A scanning signal wiring lead terminal connected to the scanning signal wiring formed on the rear substrate and an image signal wiring lead terminal connected to the image signal wiring pass through the sealing region between the frame and both substrates.
JP 2002-75254 A JP 2002-100313 A JP 2003-226858 A JP 2004-363075 A

  With respect to the self-luminous image display device as described above, Patent Document 1 has a configuration in which electrodes are provided on the contact surfaces of the frame body with both substrates and a high resistance film is disposed on the side wall side surface in contact with the contact surfaces. It is disclosed. Patent Document 2 discloses a configuration in which two types of resistance films having different resistance values are sequentially arranged outside the display area in order to prevent discharge. Furthermore, Patent Document 3 discloses a silicon-based sealing material.

  In this type of image display apparatus, the countermeasure against discharge is indispensable. However, there has been a risk of causing contamination and damage to the inner surfaces of both substrates including the display area as a countermeasure against this, and this causes deterioration of display quality and a problem that hinders long life. Contains.

  It is an object of the present invention to provide a long-life image display device that solves the above-described problems and has excellent display quality.

  In order to achieve the above object, the present invention provides a conductive film that extends in the direction of the frame covering the end of a fluorescent film provided on a front substrate, and is disposed at a predetermined interval from the frame. It is characterized by having. Further, the present invention is characterized in that a high-resistance film is connected to the end of the fluorescent film and extends in the direction of the frame, and the conductive film is provided on the high-resistance film. Further, the second high resistance film is disposed on the inner side surface of the frame.

  By arranging the conductive film extending from the end of the fluorescent film in the frame direction, the electric field concentration on the high voltage application part end surface of the fluorescent screen is alleviated, and the occurrence of discharge can be suppressed. Made possible. In addition, dissipation due to the damage to the conductive film can be reduced, the generation of foreign matter in the tube is suppressed, the discharge generation factor is eliminated, and a long-life image display device with excellent display quality is made possible.

  Furthermore, a high-resistance film is arranged to cover the end of the fluorescent film, and the conductive film is arranged on the high-resistance film, so that both films become a high-voltage potential relaxation layer, and the electric field concentration on the high-voltage application portion end face of the fluorescent screen is reduced. As a result, it is possible to suppress the generation of electric discharge and to achieve a long-life image display device with excellent display quality. Furthermore, by disposing the second high resistance film on the inner side surface of the frame, it is possible to further suppress the occurrence of discharge and to enable a long-life image display device with excellent display quality.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings of the embodiments.

  1 to 5 are schematic views for explaining a first embodiment of the image display device according to the present invention. FIG. 1 (a) is a plan view seen from the front substrate side, and FIG. 1 (b) is FIG. FIG. 2 is a plan view taken along line AA in FIG. 1B, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. 4 is CC in FIG. FIG. 5 is a cross-sectional view taken along line DD of FIG. 2.

  1 to 5, reference numeral 1 is a back substrate, 2 is a front substrate, 3 is a frame body, 4 is an exhaust pipe, 5 is a sealing member, 6 is a display area, 7 is a through-hole, and 8 is a video signal. Wiring, 9 scanning signal wiring, 10 electron source, 11 connection wiring, 12 spacer, 13 adhesive member, 14 conductive film, 15 phosphor layer, 16 BM (black matrix) film for light shielding, Reference numeral 17 denotes a metal back (acceleration electrode) made of a metal thin film, and 18 denotes a fluorescent film.

  Both the substrates 1 and 2 are made of glass plates having a thickness of several millimeters, for example, about 1 to 10 mm, and both the substrates have a substantially rectangular shape and are laminated at a predetermined interval. Reference numeral 3 denotes a frame body having a frame shape. The frame body 3 is made of, for example, a sintered body of frit glass or a glass plate, and has a substantially rectangular shape by itself or a combination of a plurality of members. Between the two.

  The frame 3 is inserted in a peripheral portion between the substrates 1 and 2, and both end surfaces are hermetically bonded to the substrates 1 and 2. The thickness of the frame 3 is set to several mm to several tens mm, and the height thereof is set to a dimension substantially equal to the distance between the substrates 1 and 2. Reference numeral 4 is an exhaust pipe, and the exhaust pipe 4 is fixed to the back substrate 1. Reference numeral 5 denotes a sealing member. The sealing member 5 is made of, for example, frit glass. The frame 3 and the substrates 1 and 2 are joined and hermetically sealed.

The display area 6 in the space surrounded by the frame 3 and the substrates 1 and 2 and the sealing member 5 is evacuated through the exhaust pipe 4 and maintains a vacuum degree of 10 ⁻⁵ to 10 ⁻⁷ Torr, for example. Yes. The exhaust pipe 4 is attached to the outer surface of the rear substrate 1 as described above, and communicates with a through hole 7 formed through the rear substrate 1 so that the exhaust pipe 4 is exhausted after exhausting is completed. Is sealed.

  Reference numeral 8 denotes a video signal wiring. The video signal wiring 8 is made of a metal material as will be described later, and extends in one direction (Y direction) on the inner surface of the rear substrate 1 and is arranged in parallel in the other direction (X direction). Has been. The video signal wiring 8 airtightly penetrates the sealing region between the frame 3 and the rear substrate 1 from the display region 6 and extends to the end surface of the rear substrate 1. The video signal wiring 8 has a video signal wiring lead-out terminal 81 at the tip outside the sealing area.

  Reference numeral 9 denotes a scanning signal wiring. The scanning signal wiring 9 is made of a metal material as will be described later, and extends on the video signal wiring 8 in the other direction (X direction) intersecting with the one direction (X direction). (Y direction). The scanning signal wiring 9 airtightly penetrates the sealing region between the frame 3 and the rear substrate 1 from the display region 6 and extends to the vicinity of the end surface of the rear substrate 1. The scanning signal wiring 9 has a distal end portion outside the sealing region as a scanning signal wiring lead terminal 91.

  Reference numeral 10 is, for example, a kind of MIM type electron source disclosed in Patent Document 4, and this electron source 10 is provided in the vicinity of each intersection of the scanning signal wiring 9 and the video signal wiring 8. The electron source 10 is connected to the scanning signal wiring 9 through a connection line 11. An interlayer insulating film INS is disposed between the video signal wiring 8 and the electron source 10 and the scanning signal wiring 9.

  Here, the video signal wiring 8 is made of, for example, an Al (aluminum) film, and the scanning signal wiring 9 is made of, for example, a Cr / Al / Cr film or a Cr / Cu / Cr film. The wiring lead terminals 81 and 91 are provided at both ends of the signal wiring, respectively, but may be provided only at one end.

Next, reference numeral 12 denotes a spacer, and the spacer 12 is formed of a plate-like body formed of an insulating material such as glass or ceramics or a member having some conductivity. Installed in a position that does not interfere with operation. The spacer 12 has a specific resistance of about 10 ⁸ to 10 ⁹ Ω · cm, and has a configuration in which the resistance value is unevenly distributed as a whole. The spacers 12 are arranged almost upright on the scanning signal wirings 9 substantially parallel to the frame 3 and are fixed to the substrates 1 and 2 with an adhesive member 13 such as conductive frit glass. . Further, the spacer 12 may be fixed to the substrate only on one end side, and the arrangement is usually set at a position where the operation of the pixel is not hindered for each of the plurality of pixels. Furthermore, it is possible to arrange every several lines on the scanning signal wiring 9.

  The dimensions of the spacer 12 are set according to the substrate dimensions, the height of the frame 3, the substrate material, the spacer spacing, the spacer material, etc. Generally, the height is substantially the same as the frame 3 described above, The thickness is several tens μm to several mm or less. The length of the spacer can be about 20 mm to 1000 mm and even longer, but a practical value is preferably about 80 mm to 300 mm.

  A conductive film 14 is disposed on the inner surface of the front substrate 2 to which one end side of the spacer 12 is fixed in a positional relationship as will be described later. As the conductive film 14, a conductive frit glass containing a small amount of metal fine particles such as Ag fine particles and Ni fine particles, or an Si-based sealing material as disclosed in Patent Document 3 mentioned above, for example, 0.1% of carbon nanotubes is used. A conductive sealing material or the like added to several percent is used, and in particular, in a configuration in which the conductive sealing material is connected to the spacer 12, a material that can be adhered to the spacer 12 is preferable.

  A phosphor layer 15 for red, green, and blue is disposed inside a window surrounded by the light shielding BM (black matrix) film 16 surrounded by the conductive film 14, and the phosphor layer 15, BM A metal back (acceleration electrode) 17 made of a metal thin film is provided by, for example, a vapor deposition method so as to cover the film 16, and a fluorescent film 18 is formed by these to form a fluorescent screen.

  In operation, an anode voltage of about 3 kv to 20 kv is applied to the phosphor screen. The metal back 17 is a light reflecting film for reflecting the light emitted to the side opposite to the front substrate 2, that is, the back substrate 1 toward the front substrate 2, and increasing the light emission efficiency, and charging the surface of the phosphor particles. Also has a function to prevent.

Examples of the phosphor include Y ₂ O ₃ : Eu and Y ₂ O ₂ S: Eu for red, ZnS: Cu, Al, Y ₂ SiO ₅ : Tb for green, and ZnS for blue. : Ag, Cl, ZnS: Ag, Al, etc. can be used. The phosphor layer 15 has an average particle diameter of phosphor particles of, for example, 4 μm to 9 μm, and a film thickness of, for example, about 10 μm to 20 μm.

  Next, the conductive film indicated by reference numeral 14 described above is composed of an aggregate of a plurality of annular conductive films 141, 142, and 143 that surround the display region 6 substantially concentrically. Among the plurality of annular conductive films, the annular conductive film 141 disposed on the innermost side is disposed at a position covering the terminal end 161 of the BM film 16 and the terminal end 171 of the metal back 17 of the fluorescent film 18, and the spacer 12. It is the structure connected with the edge part.

  On the other hand, the annular conductive film 143 that is substantially concentric with the annular conductive film 141 and disposed at the outermost end is disposed at a certain distance S1 from the frame 3. Further, a triple ring structure is formed in which another annular conductive film 142 is disposed between the two annular conductive films 141 and 143 at a predetermined interval, and these structures serve as a high-voltage potential relaxation layer. .

  The arrangement width W1 of the annular conductive films 141 to 143 is required to be about 3 mm to 10 mm including a space between them. If the width W1 is less than 3 mm, the high voltage potential relaxation effect cannot be expected, and if the width W1 exceeds 10 mm, the display is performed. The area becomes narrower and the peripheral area becomes wider. Preferably, it is about 4 mm to 8 mm. Further, the film thickness is required to be 3 μm to 20 μm, and particularly preferably 5 μm to 10 μm. If this is less than 3 μm, the film may disappear, and if it exceeds 20 μm, the high-voltage potential relaxation effect cannot be expected.

  FIG. 6 is a schematic plan view showing another embodiment of the image display device of the present invention, which corresponds to FIG. 2, and the same parts as those shown in FIG. In FIG. 6, reference numeral 144 is a small dot-like conductive film, and the small dot-like conductive film 144 is arranged at a predetermined pitch within a range close to the inner surface of the frame 3 from the end of the fluorescent film 18, and a high voltage potential. It is a relaxation layer. The arrangement width was the same as in Example 1.

  The small dot (dot) conductive film 144 can be formed by, for example, an ink jet method, and the area of each dot may be determined in accordance with the charge to be leaked. Furthermore, the arrangement pitch is not limited to an equal pitch, and for example, it is possible to set different pitches for a portion close to the fluorescent film 18 and a portion close to the frame 3.

  Here, although the small dot-like conductive film 144 is illustrated in a circular shape in FIG. 6, various shapes such as a square shape, an elliptical shape, and a star shape are possible.

  7 to 9 are schematic views showing still another embodiment of the image display device of the present invention. FIG. 7 is a plan view corresponding to FIG. 2, and FIG. 8 is a cross section taken along line EE of FIG. FIGS. 9 and 9 are cross-sectional views taken along the line FF in FIG. 7. In FIGS. 7 to 9, the same parts as those shown in FIG.

  7 to 9, reference numeral 19 is a high-resistance film, and this high-resistance film 19 is disposed below the conductive film 14 having the same specifications as in the first embodiment. The start end 191 of the high resistance film 19 covers the entire circumference of the end 171 of the metal back 17 and extends in the direction of the frame 3, and the end 192 is not in contact with the frame 3 with a certain distance S 1. And acting as a second high-voltage potential relaxation layer in addition to the conductive film 14.

  The high / low resistance film 18 covers the end 171 of the metal back 17 and extends in the direction of the frame 3, but the length L 1 from the end 171 of the metal back 17 to the end 192 of the high resistance film 19. If the length is less than 3 mm, the high-voltage potential relaxation effect cannot be expected. If the length exceeds 10 mm, the display area becomes narrower and the peripheral area becomes wider. Preferably, it is about 4 mm to 8 mm. Further, the film thickness is required to be 3 μm to 20 μm, and particularly preferably 5 μm to 10 μm. If this is less than 3 μm, the film may disappear, and if it exceeds 20 μm, the high-voltage potential relaxation effect cannot be expected.

The high and low resistance film 18 is composed of an insulating high resistance oxide such as iron oxide, chromium oxide, and titanium oxide and an inorganic binder such as water glass. As iron oxide, for example, Fe ₂ O _{3 which} has been used in cathode ray tubes or the like is recommended, as chromium oxide, for example, Cr ₂ O ₃ is recommended, and as titanium oxide, TiO ₂ (rutile type) is recommended. In this configuration, the iron oxide, chromium oxide, titanium oxide or the like having a particle size of 0.1 μm to 10 μm is used. In particular, if it exceeds 10 μm, there is a problem that the particles are likely to fall off, and as a result, the potential relaxation effect is small, preferably about 0.5 μm to 3 μm.

In the case of using water glass that has been used in cathode ray tubes or the like as the inorganic binder of the high and low resistance film 18, the water glass is 1 to 20% by weight, preferably about 3 to 10% by weight. Further, in the combination of water glass and Fe ₂ O ₃ , or the combination of water glass and Cr ₂ O ₃ , and further the combination of water glass and TiO ₂ , the mixing ratio is 1: 4 to 1 for water glass: Fe ₂ O _3. : 10, water glass: Cr ₂ O ₃ is preferably from 1: 4 to 1:10, and water glass: TiO ₂ is also preferably from 1: 4 to 1:10.

The high / low anti-resistive film 19 is formed by applying a mixed solution of the above materials to the site using a known jig such as a sponge, a brush, a brush, and the like, followed by drying. The resistance value after completion is 10 ⁹ Ω / □ to 10 ¹³ Ω / □, and the resistance value of the phosphor screen on which the metal back 17 is formed is about 10 ² Ω / □ or less. It has become.

  10 and 11 are schematic cross-sectional views showing still another embodiment of the image display device of the present invention. FIG. 10 corresponds to FIG. 4 and FIG. 11 corresponds to FIG. Parts are denoted by the same symbols.

  10 and 11, reference numeral 29 is a high-resistance film, and this high-resistance film 29 is disposed on the inner surface 31 of the frame body 3 so as not to contact the substrates 1 and 2 over the entire circumference. Yes. The high resistance film 29 is formed of the same composition as the high resistance film 19 disposed on the phosphor screen side. The film thickness is also set within the same dimensions as in Example 1. Other specifications are the same as those in the third embodiment.

  In Example 4, in addition to the conductive film 14 and the high and low resistance film 18 disposed on the phosphor screen side, the second high resistance film 29 is disposed on the inner surface 31 over the entire circumference of the frame 3, thereby increasing the pressure. The potential is relaxed, and the inclination of the equipotential line near the end 171 of the metal back 17 is further smoothed. As a result, the number of occurrences of discharge is drastically reduced, and a long-life image display device with excellent display quality can be obtained. It was.

  In each of the above-described embodiments, the structure using the MIM as the electron source is taken as an example. However, the present invention is not limited to this, and the self-luminous FPD using the various electron sources described above is also applicable. The same applies.

FIG. 1A is a schematic diagram for explaining a first embodiment of an image display device according to the present invention, FIG. 1A is a plan view seen from the front substrate side, and FIG. 1B is a side view of FIG. . It is a schematic plan view along the AA line of FIG.1 (b). It is a schematic cross section along the BB line of Drawing 1 (a). It is a schematic cross section along the CC line of FIG. FIG. 3 is a schematic cross-sectional view along the line DD in FIG. 2. It is a schematic top view explaining the other Example of the image display apparatus by this invention. FIG. 10 is a schematic plan view illustrating still another embodiment of the image display device according to the present invention. It is a schematic cross section along the EE line of FIG. It is a schematic cross section along the FF line of FIG. FIG. 10 is a schematic cross-sectional view illustrating still another embodiment of the image display device according to the present invention. FIG. 10 is a schematic cross-sectional view illustrating still another embodiment of the image display device according to the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back substrate, 2 ... Front substrate, 3 ... Frame body, 4 ... Exhaust pipe, 5 ... Sealing member, 6 ... Display area, 7 ... Through-hole, 8 ... Image signal wiring, 9 ... Scanning signal wiring, 10 ... Electron source, 11 ... Connection wiring, 12 ... Spacer, 13 ... Adhesive member, 14 ... Conductive film, 141 to 143 ... annular conductive film, 144 ... small dot conductive film, 15 ... phosphor layer, 16 ... BM film, 17 ... metal back (acceleration electrode), 171 ... Metal back termination, 18... Fluorescent film, 19, 29... High resistance film, INS .. Insulating film (interlayer insulating film).

Claims (23)

A plurality of scanning signal wirings extending in one direction and arranged in parallel in the other direction perpendicular to the one direction, and a plurality of scanning signal wirings extending in the other direction and arranged in parallel in the one direction so as to intersect the scanning signal wiring A back surface comprising: an image signal wiring; an interlayer insulating film disposed between the image signal wiring and the scanning signal wiring; and an electron source provided near each intersection of the scanning signal wiring and the image signal wiring. A substrate,
Fluorescence having a phosphor layer provided corresponding to the electron source, a BM film adjacent to the phosphor layer, and an accelerating electrode for accelerating electrons emitted from the electron source so as to be directed to the phosphor layer A front substrate provided with a film and facing the back substrate with a predetermined interval;
A frame that is inserted around the display area between the rear substrate and the front substrate, and holds the predetermined interval;
An image display device comprising a sealing member that hermetically seals the frame and the front substrate and the rear substrate in a sealing region,
An image display device comprising: a conductive film that covers a terminal end of the fluorescent film, extends in the direction of the frame, and is disposed at a predetermined interval from the frame.   The image display device according to claim 1, wherein the conductive film is formed of an aggregate of a plurality of annular conductive films that surround the display region substantially concentrically.   The image display device according to claim 1, wherein the conductive film is formed of an aggregate of small dot conductive films.   The image display device according to claim 1, wherein an arrangement width of the conductive film is 3 mm to 10 mm.   A plurality of spacers disposed between the rear substrate and the front substrate in the display area and substantially parallel to the frame and fixed to either one of the substrates via an adhesive member. The image display device according to claim 1, wherein the image display device is connected to a film.   The image display device according to claim 5, wherein the adhesive member has substantially the same composition as the conductive film.   The image display device according to claim 1, wherein the conductive film contains metal fine particles. The image display apparatus according to claim 1, wherein the conductive film has a specific resistance of 10 ² Ω · cm to ^{10 10} Ω · cm. A plurality of scanning signal wirings extending in one direction and arranged in parallel in the other direction perpendicular to the one direction, and a plurality of scanning signal wirings extending in the other direction and arranged in parallel in the one direction so as to intersect the scanning signal wiring A back surface comprising: an image signal wiring; an interlayer insulating film disposed between the image signal wiring and the scanning signal wiring; and an electron source provided near each intersection of the scanning signal wiring and the image signal wiring. A substrate,
Fluorescence having a phosphor layer provided corresponding to the electron source, a BM film adjacent to the phosphor layer, and an accelerating electrode for accelerating electrons emitted from the electron source so as to be directed to the phosphor layer A front substrate provided with a film and facing the back substrate with a predetermined interval;
A frame that is inserted around the display area between the rear substrate and the front substrate, and holds the predetermined interval;
An image display device comprising a sealing member that hermetically seals the frame and the front substrate and the rear substrate in a sealing region,
A high resistance film that covers the substantially entire surface of the end of the fluorescent film and extends in the direction of the frame and is spaced from the frame by a predetermined distance, and the end of the fluorescent film is disposed on the high resistance film. An image display device comprising: a conductive film that covers and extends in the frame body direction and is disposed at a predetermined interval from the frame body.   The image display device according to claim 9, wherein the conductive film is an aggregate of a plurality of annular conductive films that surround the display region substantially concentrically.   The image display device according to claim 9, wherein the conductive film is formed of an assembly of small dot conductive films.   The image display device according to claim 9, wherein an arrangement width of the conductive film is 3 mm to 10 mm.   A plurality of spacers disposed between the rear substrate and the front substrate in the display area and substantially parallel to the frame and fixed to either one of the substrates via an adhesive member. The image display device according to claim 9, wherein the image display device is connected to a film.   The image display device according to claim 13, wherein the adhesive member has substantially the same composition as the conductive film.   The image display device according to claim 9, wherein the conductive film contains metal fine particles. The image display device according to claim 9, wherein the conductive film has a specific resistance of 10 ² Ω · cm to ^{10 10} Ω · cm.   The image display device according to any one of claims 9 to 16, wherein the high resistance film is further disposed at a portion separated from the back substrate and the front substrate on an inner surface of the frame. The image display device according to claim 9, wherein the high resistance film has a resistance value of 10 ⁹ Ω / □ to 10 ¹³ Ω / □.   The image display device according to claim 9, wherein the extended length of the high-resistance film is 3 to 10 mm from a terminal end of the acceleration electrode. 20. The high resistance film includes an insulating high resistance oxide.
An image display device according to any one of the above. 21. The image display device according to claim 9, wherein the insulating high-resistance oxide contains one of Fe ₂ O ₃ , Cr ₂ O ₃ , and TiO ₂ as a main component.   The image display device according to claim 9, wherein the high-resistance film includes 1 to 20% by weight of water glass. The high resistance film is formed by mixing water glass and Fe ₂ O ₃ , water glass and Cr ₂ O _3, or a ratio of water glass and TiO ₂ in the range of 1: 4 to 1:10. The image display device according to any one of 9 to 22.

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