JP2009123634A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plane image display device in which a color mixture on a fluorescent surface is prevented and a high luminance and a long life are realized. <P>SOLUTION: The plate image display device is provided with a lot of fine pointed projections of a small secondary electron emission factor on a side surface of a spacer. <P>COPYRIGHT: (C)2009,JPO&INPIT

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.
This cold cathode has a Spindt type electron source, surface conduction type electron source, carbon nanotube type electron source, MIM (Metal-Insulator-Metal) type in which metal-insulator-metal is laminated, and metal-insulator-semiconductor. MIS (Metal-Insulator-Semiconductor) type or thin-film type electron source such as metal-insulator-semiconductor-metal type.

  A general self-luminous FPD has a rear substrate provided with an electron source as described above on an insulating plate such as a glass plate, a phosphor layer, and electrons emitted from the electron source to the phosphor layer. A front substrate provided with an anode for forming an electric field on a plate made of a light-transmitting material suitable for glass, and a frame body that holds internal spaces facing each other at a predetermined interval. The display panel is configured to hold the internal space including the display area formed by the two substrates and the frame in a vacuum state, and the display panel is configured by combining a drive circuit.

  Further, on the back substrate, a plurality of video signal wirings extending in one direction and arranged in parallel in the other direction perpendicular to the one direction, an insulating film formed to cover the video signal wirings, A plurality of scanning signal wirings are arranged on the insulating film in the other direction and arranged in parallel in the one direction so as to cross the video signal wiring, and sequentially applied with scanning signals. In addition, the electron sources are provided in the vicinity of the intersection of the scanning signal wiring and the video signal wiring, and 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 common.

  Further, the individual electron sources constitute a unit pixel paired with a corresponding phosphor layer disposed on the front substrate. 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 vacuum region including a display region surrounded by the frame body between the rear substrate and the front substrate, The distance between the two substrates is held at a predetermined distance 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 vacuum region formed by both the substrates and the frame is, for example, about 10 ⁻⁵ to 10 ⁻⁷ Torr.

  Further, a scanning signal wiring lead terminal connected to the scanning signal wiring formed on the back substrate and an image signal wiring lead terminal connected to the image signal wiring pass through the sealing region between the frame body and the back substrate.

The aforementioned MIM type electron source is disclosed in, for example, Patent Document 1. An outline of the structure and operation of the MIM type electron source is as follows.
That is, it has a structure in which an insulating layer is interposed between the upper electrode and the lower electrode, and by applying a voltage between the upper electrode and the lower electrode, electrons in the vicinity of the Fermi level in the lower electrode are tunneled. Due to the phenomenon, it passes through the barrier, is injected into the conduction band of the insulating layer, which is the electron acceleration layer, becomes hot electrons, and flows into the conduction band of the upper electrode. Among these hot electrons, those that reach the surface of the upper electrode with energy equal to or higher than the work function φ of the upper electrode are released into the vacuum.
JP 2004-363075 A JP-A-10-302676 JP 2002-157959 A JP 2000-31633 A

In the image display device configured as disclosed in Patent Document 1, an electron beam emitted from an electron source disposed on the rear substrate side is accelerated and projected onto the phosphor layer of the front substrate, and excited. As a result, the phosphor layer is configured to emit color with colored light corresponding to the light emission characteristics of the phosphor layer.
In such a configuration, since a strong electric field is applied between the two substrates, the color purity is reduced due to the occurrence of discharge between the spacer and the substrate and the occurrence of bending of the electron trajectory accompanying the charging of the spacer. There has been a problem of deteriorating the display quality such as lowering the luminance.

  As one means for solving this problem, Patent Document 2 discloses an invention in which the entire substrate surface of a spacer is covered with an oxide cermet film. Patent Document 3 discloses an invention of a method for forming a film such as an oxide cermet film of Patent Document 2 described above. Further, Patent Document 4 discloses an invention of a spacer fixing structure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a flat image display device that prevents color mixing and discharge, ensures color purity and increases brightness, has excellent display quality, and has a long life. .

  In order to achieve the above object, the present invention provides a plurality of video signal wirings extending in a first direction and arranged in parallel in a second direction intersecting the first direction, and extending in the second direction. A plurality of scanning signal wirings arranged in parallel in the first direction, an insulating film interposed between the video signal wiring and the scanning signal wiring, and a crossover of the video signal wiring and the scanning signal wiring. A back substrate having a plurality of electron sources connected to the scanning signal wiring and provided with a plurality of BM windows on the inner surface facing the back substrate, A phosphor film that covers the plurality of BM windows of the black matrix film and has a phosphor layer that is disposed on the inner surface of the front substrate and emits light by excitation of electrons from the electron source, and a metal back that covers the phosphor film And a predetermined distance from the back substrate. A front substrate disposed oppositely, a frame disposed between the back substrate and the front substrate and holding the both substrates at a predetermined interval, and substantially parallel to the frame between the back substrate and the front substrate An image display device comprising: a plurality of spacers arranged and fixed; and a sealing member that hermetically seals an end surface of the frame body and the front substrate and the rear substrate. It was set as the structure provided with the following independent fine dot-like process.

The present invention also provides a plurality of video signal wirings extending in a first direction and arranged in parallel in a second direction intersecting the first direction, and extending in the second direction. Provided in the vicinity of the intersection of the plurality of scanning signal wirings arranged in parallel in the first direction, the insulating film interposed between the video signal wiring and the scanning signal wiring, and the video signal wiring and the scanning signal wiring A back substrate having a plurality of electron sources connected to the scanning signal wiring, a black matrix film arranged with a plurality of BM windows on an inner surface facing the back substrate, and a black matrix film A fluorescent film that covers the plurality of BM windows and is disposed on the inner surface of the front substrate and has a phosphor layer that emits light by excitation of electrons from the electron source; and a metal back layer that covers the fluorescent film. The rear substrate is disposed opposite to the rear substrate with a predetermined interval. A surface substrate, a frame disposed between the back substrate and the front substrate and holding the two substrates at a predetermined interval, and a plurality of substrates disposed and fixed substantially parallel to the frame between the back substrate and the front substrate. And a sealing member that hermetically seals the end surface of the frame body and the front substrate and the rear substrate, wherein the spacer end surface is joined to a multilayer conductive film and a bonding member. It was set as the structure joined to the said board | substrate through the member.
A self-luminous flat display device is configured by incorporating an image signal driving circuit, a scanning signal driving circuit, and other peripheral circuits into the flat-type image display device configured as described above.

  The occurrence of discharge and color mixing can be prevented, the color purity can be ensured and the luminance can be increased, and a flat image display device with excellent display quality and high reliability can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 4 are diagrams for explaining an embodiment of the flat image display device of the present invention. FIG. 1 (a) is a schematic plan view seen from the front substrate side, and FIG. 1 (b) is FIG. 2A is a schematic side view, FIG. 2 is a schematic plan view along the line AA in FIG. 1B, and FIG. 3 is a schematic cross-sectional view of the back substrate along the line BB in FIG. FIG. 4 is a schematic side view of a part of FIG. 2 and a schematic enlarged view of a portion of the front substrate corresponding to the substrate.

  1 to 4, reference numeral 1 is a rear substrate, 2 is a front substrate, 3 is a frame, 4 is an exhaust pipe, 5 is a sealing member, 6 is a vacuum region including a display region, 7 is a through hole, 8 Is a video signal wiring, 9 is a scanning signal wiring, 10 is an electron source, 11 is a connection wiring, 12 is a spacer, 13 is an adhesive member, 14 is an interlayer insulating film, 15 is a phosphor layer, and 16 is a light-shielding BM (black) A matrix) film 17 is a metal back (anode electrode) made of a metal thin film.

The back substrate and the front substrate 2 indicated by reference numeral 1 have a substantially rectangular shape, and are each composed of a glass plate having a thickness of several mm, for example, about 1 to 10 mm.
Reference numeral 3 denotes a frame having a frame shape. The frame body 3 is made of, for example, a sintered body of frit glass or a glass plate, and is formed into a substantially rectangular shape by itself or a combination of a plurality of members. Is inserted.
The frame 3 is inserted in a peripheral portion between the substrates 1 and 2 and both end surfaces are airtightly joined 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.
An exhaust pipe 4 is fixed to the back substrate 1.
5 is a sealing member, and this sealing member 5 is composed of, for example, a low melting point frit glass such as PbO: 75-80 wt%, B2 O3: about 10 wt%, others: 10-15 wt%, etc. A glass material including a frit type glass is known, and the frame 3 and the substrates 1 and 2 are joined and hermetically sealed.

A vacuum region 6 including a display region surrounded by the frame 3, both substrates 1 and 2, and the sealing member 5 is exhausted through the exhaust pipe 4, and has a vacuum degree of 10 ⁻⁵ to 10 ⁻⁷ Torr, for example. keeping. 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 stripe-shaped video signal wiring. The video signal wiring 8 is made of, for example, an aluminum (Al) film, an alloy of aluminum and neodymium (Al—Nd), and the like. It extends in the direction (Y direction) and is arranged in parallel in the second direction (X direction).
The upper surface of the video signal wiring 8 is provided with a tunnel insulating film 82 at a position corresponding to an electron source described later, and the remaining part is covered with a field insulating film (not shown). The video signal wiring 8 airtightly penetrates from the vacuum region 6 to the joining region between the frame 3 and the back substrate 1 and extends to the end on the long side of the back substrate 1. The wiring lead terminal 81 is used.

  Reference numeral 9 denotes a stripe-shaped scanning signal wiring. The scanning signal wiring 9 extends on the video signal wiring 8 in the second direction (X direction) intersecting with the first signal (Y direction). ). The scanning signal wiring 9 is made of an aluminum film or an aluminum alloy film containing aluminum as a main component. The scanning signal wiring 9 airtightly penetrates from the vacuum region 6 to the joining region between the frame 3 and the rear substrate 1 and extends to the end portion on the short side of the rear substrate 1, and the tip portion is scanned with the scanning signal. The wiring lead terminal 91 is used.

  An interlayer insulating film 14 is disposed between the video signal wiring 8 and the scanning signal wiring 9. As the interlayer insulating film 14, for example, silicon oxide, silicon nitride, silicon or the like can be used. The interlayer insulating film 14 fills in defects when a field insulating film formed by anodic oxidation on the surface of the video signal wiring 8 has a pinhole and maintains insulation between the video signal wiring 8 and the scanning signal wiring 9. Fulfill.

  Next, reference numeral 10 denotes an electron source. This electron source 10 is, for example, a kind of MIM type electron source disclosed in Patent Document 1, and the electron source 10 includes the scanning signal wiring 9 and the video signal wiring 8. Is provided in the tunnel insulating film 82 of the video signal wiring 8 in the vicinity of the crossing portion. The electron source 10 is connected to the scanning signal wiring 9 by a connection wiring 11.

  Next, reference numeral 12 denotes a spacer. The spacer 12 is formed by a spacer base 121 shaped into a substantially rectangular thin plate shape, and a plurality of independent fine dot-like protrusions 122 arranged on the side surface of the spacer base 121. It is constituted by a combination, and the surface of the spacer 12 has a structure in which a large number of irregularities are formed.

With such a configuration, the total covering area of the plurality of independent fine dot-like protrusions 122 is preferably 30% to 70% of the side surface area of the spacer base 121 to be deposited.
If this ratio is less than 30%, the emission current dependency of the electron beam remains and bending of the electron trajectory is observed. On the other hand, if it exceeds 70%, the spacer base 121 may be damaged due to thermal runaway. 40% to 50% is most preferable.
Further, the height H of the fine dot-like projections 122 is preferably 0.5 μm to 3 μm.
If this height H is less than 0.5 μm, the effect of suppressing hopping conduction may not be expected, and if it exceeds 3 μm, peeling may occur. Most preferable is 1 μm to 2 μm.

In such a configuration, the spacer base 121 is composed of, for example, a glass material such as WO ₃ : 30 wt%, V ₂ O ₅ : 15 wt%, P ₂ O ₅ : 30 wt%, BaO: 15 wt%, MoO ₃ : 10 wt%. And a volume resistivity of 10 ⁸ Ω · cm to ^{10 10} Ω · cm.
On the other hand, the fine dot-like protrusions 122 are made of a glass material like the spacer base 121, and the composition thereof is, for example, V ₂ O ₅ : 55 wt%, P ₂ O ₅ : 20 wt%, BaO: 5 wt%, Sb. ₂ O _3: having a basic composition of 20 wt%, which further Y ₂ O ₃ and ZnO were added, the ratio basic _{composition: 50wt%, Y 2 O 3} : 33wt%, ZnO: and 17 wt%, the volume It consists of a glass material having a resistivity of 10 ² Ω · cm to 10 ⁷ Ω · cm.

Further, the fine dot-shaped protrusion 122 having the above-described configuration has a secondary electron emission coefficient lower by about 20% than the spacer base 121.
The fine dot-shaped protrusion 122 can be formed by spraying, printing, or the like. Further, it is desirable that the area and height of each fine dot-like projection 122 be substantially uniform.

The spacers 12 having the above-described configuration are arranged upright every other on the scanning signal wiring 9 substantially in parallel with the frame 3, and are bonded and fixed to the both substrates 1 and 2 by an adhesive member 13.
The spacer 12 may be bonded and fixed to the substrate only at one end side, and the arrangement is usually set at a position that does not hinder the operation of each pixel.

  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 can be several tens of μm to several mm or less, the length can be about 20 mm to 1000 mm, and even longer, but a practical value is preferably about 80 mm to 300 mm.

On the other hand, on the inner surface of the front substrate 2 to which one end of the spacer 12 is fixed, a red, green, and blue phosphor layer 15 is formed in a BM window 161 that is partitioned by a light-shielding BM (black matrix) film 16. A metal back (anode electrode) 17 made of a metal thin film is provided so as to cover them, for example, by a vapor deposition method to form a 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 side, toward the front substrate 2 side to increase the light extraction efficiency, and on the surface of the phosphor particles. It also has a function to prevent electrification.
Further, although the metal back 17 is shown as a surface electrode, it may be a stripe electrode that intersects the scanning signal wiring 9 and is divided for each pixel column.

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.

The phosphor screen structure will be described in more detail. A black matrix film 16 is formed on the inner surface of the front substrate 2 with a plurality of BM window portions 161.
The BM window 161 of the black matrix film 16 is formed in a substantially rectangular shape having a long side in the extending direction of the video signal wiring 8 and a short side in the extending direction of the scanning signal wiring 9. The center point of the BM window 161 having a shape is set as the center of gravity, and the center of gravity is sequentially arranged in the extending direction of the scanning signal wiring 9.
The black matrix film 16 covers the BM window 161 and extends to a part of the back surface, and the phosphor layers 15 are respectively disposed in the predetermined BM window.
The relative positions of the BM window 161 and the electron source 10 disposed on the back substrate 1 side so as to be opposed to the BM window 161 are arranged such that the position of the center of gravity of the electron source matches the position of the center of gravity of the BM window 161. .

In the configuration of the first embodiment, the spacer 12 has a large number of fine dot-like protrusions 122 arranged on the side surfaces of the spacer base 121 to form irregularities on the surface, and thus when the irregularity treatment on the surface is performed, hopping conduction is performed. Due to the suppression effect, the charge amount is small and the electron beam deflection amount can be reduced as compared with the spacer not subjected to the unevenness treatment.
In addition, since the secondary electron emission coefficient δ at the smooth portion and the convex portion of the spacer surface is about 20% lower due to the relationship of smooth portion> convex portion, the electron beam deflection due to the emission current is reduced. It becomes possible to suppress the dependency.

Here, in the first embodiment, the spacer base 121 and the fine dot protrusion 122 are made of glass materials having different characteristics. However, the secondary electron emission coefficient δ of the spacer base 121 and the fine dot protrusion 122 is substantially the same. However, the effect of suppressing hopping conduction by the unevenness effect can be expected. In this case, it is desirable that the secondary electron emission coefficient δ is small.

FIG. 5 is a schematic cross-sectional view corresponding to FIG. 3 for explaining another embodiment of the image display device of the present invention.
In FIG. 5, the spacer 12 includes an antistatic film 123 that covers the outer surface of the spacer base 121 and the fine dot-like protrusions 122, and the antistatic film 123 follows the uneven shape of the surface by the numerous independent fine dot-like protrusions 122. It is a configuration. Other configurations are substantially the same as those of the first embodiment.
With such a configuration, the antistatic film 123 is formed of, for example, a mixed material of iron oxide (Fe ₂ O ₃ ) and gallium oxide (Ga ₂ O ₃ ), and the coating thickness is about 50 nm.

  In the configuration of the second embodiment, the charge amount of the spacer can be further reduced by arranging the antistatic film 123 in addition to the configuration of the first embodiment.

FIG. 6 is a schematic cross-sectional view corresponding to FIG. 3 for explaining still another embodiment of the image display apparatus of the present invention.
In FIG. 6, the spacer 12 has a multi-layered, in this example, two-layer conductive film 23 disposed at the joint between the two substrates 1 and 2, and the multilayer conductive film 23 is bonded to the bonding member 13. 2 is configured to be joined and fixed.
This multilayer conductive film 23 has a structure in which, for example, a 100 nm-thickness Cr (chromium) film 231 is disposed in contact with the end surface of the spacer base 121 and the upper side thereof is covered with, for example, a 200 nm-thickness Al (aluminum) film. is there. Each of these films can be formed by sputtering, for example.

In the configuration of Example 3, the Cr film was covered with the Al film as described above.
On the other hand, in this type of image display device using spacers, the spacers are bonded between the end surfaces of the spacers and the joining members in order to stabilize the adhesion and connection between the two substrates and reduce the amount of electron beam deflection in the vicinity of the spacers. It has been proposed to arrange a single layer Cr film.
The Cr film forms a surface oxide film by a heating process in the panel manufacturing process, and film unevenness occurs. As a result, the resistance of the Cr film is also increased, the resistance uniformity within one spacer is lost, and there is a problem that the electron beam deflection is also affected.
In Example 3, as described above, the Cr film is covered with an Al film to prevent the Cr film from being oxidized and to achieve uniform resistance. As a specific example, as a result of confirming the change in resistance value after heating the single-layer Cr film and the two-layer film of the example at 460 ° C. for 30 minutes with the respective film thicknesses described above, the single-layer Cr film has a fluctuation range of the resistance value. While a large variation exceeding three times was exhibited, the configuration of the example did not cause a variation in resistance value and could maintain a stable property.
Here, in Example 3, the multilayer film is disposed at both ends of the spacer. However, the back substrate 1 side can be omitted in consideration of the potential gradient, and this configuration also reduces the amount of electron beam deflection in the vicinity of the spacer. Although effective, it is possible to prevent electric field concentration due to the spacer connection and to suppress the generation of stray emissions.

FIG. 7 is a schematic cross-sectional view corresponding to FIG. 3 for explaining still another embodiment of the image display apparatus of the present invention.
In FIG. 7, the spacer 12 is composed of a combination of a spacer base 121 and a large number of independent fine dot-like protrusions 122 arranged on the side surfaces of the spacer base 121. In this example, a multi-layered, two-layered conductive film 23 is disposed in the joint, and the multi-layered conductive film 23 is joined to the substrates 1 and 2 as a construction to be joined to the joining member 13. Other configurations are substantially the same as those of the first and third embodiments.

  FIG. 8 is an explanatory diagram of an equivalent circuit example of a flat-type image display device to which the configuration of the present invention is applied. A region indicated by a broken line in FIG. 8 is a vacuum region 6 including a display region. In this vacuum region 6, n video signal wirings 8 and m scanning signal wirings 9 are arranged so as to cross each other, and n × A matrix of m is formed. Each intersection of the matrix constitutes a sub-pixel, and one group of three unit pixels (or sub-pixels) “R”, “G”, and “B” in the figure constitutes one color pixel. The configuration of the electron source is not shown. The video signal line 8 is connected to the video signal drive circuit DDR at the video signal line lead terminal 81, and the scan signal line 9 is connected to the scan signal drive circuit SDR at the scan signal line lead terminal 91. The video signal NS is input from the external signal source to the video signal driving circuit DDR, and the scanning signal SS is similarly input to the scanning signal driving circuit SDR.

  Accordingly, a two-dimensional full-color image can be displayed by supplying a video signal to the video signal wiring 8 that intersects the scanning signal wiring 9 that is sequentially selected.

In the above embodiment, the structure using the MIM type as the electron source is taken as an example. However, the present invention is not limited to this, and the present invention is also applicable to the self-luminous FPD using the various electron sources described above. The same applies.
Further, although the planar shape of the fine dot-like projections is circular, other shapes can be applied in the same manner.
Furthermore, it goes without saying that the multilayer conductive film is not limited to Cr or Al.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining one embodiment of a flat image display device of the present invention, in which FIG. 1 (a) is a schematic plan view seen from the front substrate side, and FIG. 1 (b) is a schematic diagram of FIG. It is a side view. It is a schematic plan view along the AA line of FIG.1 (b). FIG. 3 is a schematic cross-sectional view of a back substrate taken along line BB in FIG. 2 and a schematic cross-sectional view of a front substrate corresponding to the back substrate. FIG. 3 is a partial schematic side view and a schematic enlarged view of FIG. 2. It is a schematic cross section corresponding to FIG. 3 of the other Example of the flat type image display apparatus of this invention. FIG. 6 is a schematic cross-sectional view corresponding to FIG. 3 of still another embodiment of the flat image display device of the present invention. FIG. 6 is a schematic cross-sectional view corresponding to FIG. 3 of still another embodiment of the flat image display device of the present invention. It is explanatory drawing of the equivalent circuit example of the flat type image display apparatus to which the structure of this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back substrate, 2 ... Front substrate, 3 ... Frame, 4 ... Exhaust pipe, 5 ... Sealing member, 6 ... Vacuum region including display region, 7 ... -Through hole, 8 ... Video signal wiring, 82 ... Tunnel insulating layer, 9 ... Scanning signal wiring, 10 ... Electron source, 11 ... Connection wiring, 12 ... Spacer, 121 ... ..Spacer base, 122... Dots, 123 .Antistatic film, 13 .adhesive member, 14 .. interlayer insulating film, 15... Phosphor layer, 16. BM (black matrix) film, 17 ... metal back (anode electrode) made of a metal thin film, 23 ... multilayer conductive film.

Claims (12)

A plurality of video signal wirings extending in the first direction and arranged in parallel in a second direction intersecting the first direction, and extending in the second direction and aligned in the first direction. A plurality of scanning signal wirings provided; an insulating film interposed between the video signal wirings and the scanning signal wirings; and the scanning signal wirings provided in the vicinity of an intersection of the video signal wirings and the scanning signal wirings. A back substrate having a plurality of electron sources connected to
A black matrix film provided with a plurality of BM window portions on the inner surface facing the back substrate, and a plurality of BM window portions of the black matrix film covering the plurality of BM window portions and arranged on the inner surface from the electron source A phosphor film having a phosphor layer that emits light by excitation of electrons, a metal back layer covering the phosphor film, and a front substrate disposed opposite to the back substrate at a predetermined interval;
A frame disposed between the back substrate and the front substrate to hold the substrates at a predetermined interval;
A plurality of spacers arranged and fixed substantially parallel to the frame body between the back substrate and the front substrate;
An image display device comprising a sealing member that hermetically seals the end face of the frame and the front substrate and the rear substrate,
The image display apparatus, wherein the spacer includes a large number of independent fine-point protrusions on a side surface of the spacer.   2. The image display device according to claim 1, wherein the spacer includes a spacer base and a large number of independent fine dot-like projections attached to side surfaces of the spacer base.   The image display device according to claim 1, wherein the spacer base has a secondary electron emission coefficient different from that of the fine dot-like projections.   The image display device according to claim 1, wherein the spacer base has a volume resistivity different from that of the fine dot-like projections.   5. The image display device according to claim 1, wherein the spacer covers 30% to 70% of a side surface of the spacer base with the fine dot-like projections.   The image display device according to claim 1, wherein a height of the fine dot-like projections is 0.5 μm to 3 μm.   7. The spacer base is made of glass containing tungsten and phosphorus as main components, and the fine dot-like projections are made of glass containing vanadium and phosphorus as main components. Image display device.   8. The image display device according to claim 2, wherein the spacer has a configuration in which the side surface of the spacer base and the fine dot-like projections are covered with an antistatic film. A plurality of video signal wirings extending in the first direction and arranged in parallel in a second direction intersecting the first direction, and extending in the second direction and aligned in the first direction. A plurality of scanning signal wirings provided; an insulating film interposed between the video signal wirings and the scanning signal wirings; and the scanning signal wirings provided in the vicinity of an intersection of the video signal wirings and the scanning signal wirings. A back substrate having a plurality of electron sources connected to
A black matrix film provided with a plurality of BM window portions on the inner surface facing the back substrate, and a plurality of BM window portions of the black matrix film covering the plurality of BM window portions and arranged on the inner surface from the electron source A phosphor film having a phosphor layer that emits light by excitation of electrons, a metal back layer covering the phosphor film, and a front substrate disposed opposite to the back substrate at a predetermined interval;
A frame disposed between the back substrate and the front substrate to hold the substrates at a predetermined interval;
A plurality of spacers arranged and fixed substantially parallel to the frame body between the back substrate and the front substrate;
An image display device comprising a sealing member that hermetically seals the end face of the frame and the front substrate and the rear substrate,
The image display device, wherein the spacer is formed by bonding the end face of the spacer to the substrate via a multilayer conductive film and a bonding member.   The image display device according to claim 9, wherein the multilayer conductive film has a two-layer film structure in which a first layer on a spacer end face side is a Cr film and a second layer is an Al film.   11. The image display device according to claim 9, wherein the spacer is formed by covering the side surface of the spacer base with a number of independent fine-point protrusions.   The electron source has a lower electrode, an upper electrode, and an electron acceleration layer sandwiched between the lower electrode and the upper electrode, and an electron is applied from the upper electrode by applying a voltage between the lower electrode and the upper electrode. The image display device according to claim 1, wherein the image display device is a thin film electron source array that emits light.

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