JP2003077410A - Display device and substrate for display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with fluctuation between display cells curtailed on various controls concerning electron emission. SOLUTION: A gate electrode 14 is provided with a positioning hole 14a, a rib 13 with a protrusion 13a at the peak, which is inserted into the positioning hole 14a. The protrusion 13a is provided with a frit glass 15, to which the gate electrode 14 is fixed. Each of cold cathodes contained in each cell makes up an electron emitting source for having a corresponding phosphor 23 emit light. Ribs 13 are arranged to partition adjacent cells, formed in a given height by, for instance, a multilayer printing method. The ribs 13 of multilayer films are all insulating films, or a part of them are formed including conductive films. The cold cathode 12 is formed by printing paste of carbon nanotube or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a substrate for a display device, and more particularly, to a high quality display in which variations such as unevenness in brightness are suppressed by reducing variations among display cells for various controls relating to electron emission. Technology for obtaining.

[0002]

2. Description of the Related Art FIG. 10 shows a sectional view for explaining a conventional display device 1P, and FIG. 11 shows a plan view for explaining a first substrate 10P of the display device 1P. The cross section taken along the line II-II in FIG. 11 corresponds to FIG. 10. The conventional display device 1P includes a first substrate 10P, a second substrate 20, and a frame 30.

More specifically, the first substrate 10P is the cathode substrate 11
P, a cold cathode 12P, a rib 13P and a gate electrode 14P. For example, a plurality of cold cathodes 12P and ribs 13P extend on a cathode substrate 11P made of glass, and the cold cathodes 12P and the ribs 13P are alternately arranged. Rib 13P
Are formed at a predetermined height by multilayer printing.

A plurality of gate electrodes 1 are provided on top of the ribs 13P.
4P is arranged. The gate electrode 14P is the cold cathode 12.
The gate electrode 14 extends so as to intersect with P.
Both ends of P are fixed with frit glass or the like (not shown). A mesh opening 14bP is formed in each portion of the gate electrode 14P facing the cold cathode 13P.

On the other hand, the second substrate 20 is provided with an anode substrate 21, a phosphor 23 and an anode (see the anode 22 shown in FIG. 1 described later). For example, the fluorescent material 23 is applied to the glass anode substrate 21 so as to face the mesh openings 14bP of the gate electrode 14P. Furthermore, the anode substrate 21
An anode is formed on the phosphor 23 so as to cover the phosphor 23 (not shown).

The cathode substrate 11P and the anode substrate 21 are sealed via a frame-shaped body 30 along the peripheral edges of the both substrates 11P and 21. The cathode substrate 11, the anode substrate 21 and the frame-shaped body 30 display A vacuum container that serves as the base of the device 1P is formed.

In the display device 1P, the gate electrode 14P
Each (three-dimensional) intersection between the cold cathode 12P and the cold cathode 12P or each phosphor 23 is one display cell (also simply referred to as "cell") on the screen.
Corresponds to 3P.

The electrons emitted from the cold cathode 12P are extracted by (the potential of) the gate electrode 14P, pass through the mesh opening 14bP, and collide with the phosphor 23. The phosphor 23 emits light due to the collision of the electrons.

Unlike the hot cathode, the cold cathode 2P does not need to be heated and therefore consumes less power. Further, since the cold cathode 2P can be arranged at a higher density than the hot cathode, a high resolution display device can be realized.

Here, FIG. 12 shows a diagram for explaining a general electron emission characteristic of the cold cathode 12P. Cold cathode 12P
Since electrons are emitted from the high electric field, it is necessary to apply a voltage equal to or higher than a threshold value to the cold cathode 12P in order to obtain stable electron emission. Gate electrode 14P and cold cathode 1
When ON voltage is applied to 2P and cold cathode simultaneously, cold cathode 12P
The potential in the vicinity exceeds the threshold value, and electrons are emitted from the cold cathode 12P. On the other hand, the gate electrode 14P and the cold cathode 12
When only one of P and P is ON, the potential of the cold cathode 12P does not reach the threshold value and electrons are not emitted.

As described above, the cold cathode 12P and the gate electrode 1
Since it is arranged so as to be orthogonal to 4P, dynamic driving can be applied. In the dynamic driving, a scanning signal is applied to the gate electrode 14P and a data signal is applied to the cold cathode 12P to control the light emission of the phosphor 23 arranged at the position corresponding to the intersection of the two electrodes 14P and 12P, thereby performing scanning. The image is displayed by going around.

[0012]

Generally, the cold cathode 12
The electrons emitted from P sensitively change depending on the electric field near the cold cathode 12P. Therefore, the positional accuracy of the cold cathode 12P and the gate electrode 14P is important in order to stabilize the electric field near the cold cathode 12P and secure a sufficient amount of emitted electrons.

In the conventional display device 1P, the cold cathode 12
The distance between P and the gate electrode 14P is, for example, about several tens of μm. The accuracy in the vertical direction of the screen, specifically, the accuracy in the arrangement direction of the gate electrodes 14P is 10 μm or less.
Further, the accuracy in the horizontal direction, specifically, the accuracy in the arrangement direction of the cold cathodes 12P becomes stricter as the pitch of the cells 3P becomes narrower and the resolution becomes higher.

As described above, in the conventional display device 1P, the gate electrode 14P is disposed on the rib 13P, and the gate electrode 1
Only both ends of 4P are fixed with frit glass or the like. Therefore, there is a problem in that the arrangement accuracy of the gate electrode 14P is low and the spread of the electron beam varies due to the arrangement displacement of the mesh opening 14bP.
Further, the above-mentioned fixing method has a problem that the gate electrode 14P is deformed, and the electric field near the cold cathode 12P and the amount of emitted electrons vary.

As a result, in the conventional display device 1P,
Light emission is likely to vary among the cells 3P, and it is difficult to make the entire screen emit light uniformly. It should be noted that variations in light emission are observed as, for example, uneven brightness on the entire screen.

The present invention has been made in view of the above points, and it is possible to realize high-quality display in which variations such as brightness unevenness are suppressed by reducing variations among display cells regarding various controls relating to electron emission. It is an object of the present invention to provide a display device and a display device substrate.

[0017]

According to a first aspect of the present invention, there is provided a display device, wherein a vacuum container, an electron emission source arranged in the vacuum container, and a positioning hole arranged so as to face the electron emission source. And a rib that is disposed adjacent to the electron emission source in the vacuum container and that has a convex portion that is inserted into the positioning hole of the gate electrode.

A display device according to a second aspect is the display device according to the first aspect, wherein the rib is formed of a multilayer film of at least two kinds of materials.

The display device according to a third aspect is the display device according to the first or second aspect, further comprising a frit glass which is provided on the convex portion of the rib and fixes the gate electrode. Further prepare.

The display device according to claim 4 is the display device according to any one of claims 1 to 3, wherein a plurality of the electron emission sources are provided, and the ribs are provided with the plurality of electron emission sources. It is arranged so as to divide the space.

The display device according to claim 5 is the display device according to any one of claims 1 to 4, wherein the electron emission source is a cold cathode made of a carbon-based material containing carbon nanotubes. Including.

A display device substrate according to a sixth aspect has an insulating substrate, an electron emission source arranged on the insulating substrate, and a positioning hole arranged so as to face the electron emission source. A gate electrode and a rib that is arranged on the insulating substrate adjacent to the electron emission source and has a convex portion that is inserted into the positioning hole of the gate electrode are provided.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION <First Embodiment> FIG. 1 is a sectional view showing a display device 1 according to the first embodiment.
FIG. 2 shows a plan view for explaining the first substrate 10 of the display device 1. In order to avoid complication of the drawing, some elements of the first substrate 10 are omitted in FIG. For the sake of explanation, FIG. 3 shows a diagram in which some elements are removed from the plan view of FIG. The cross section taken along the line I-I in FIG. 2 corresponds to FIG.

The display device 1 includes a first substrate (or a display device substrate) 10, a second substrate 20 and a frame 30 (see FIG. 10). The first and second substrates 10 and 20 are both substrates. It is sealed via a frame-shaped body 30 along the periphery of 10, 20. At this time, the first substrate 10 includes the cathode substrate 11, the second substrate 20 includes the anode substrate 21,
The cathode substrate 11, the anode substrate 21, and the frame-shaped body 30 form a vacuum container 2 that serves as a base of the display device 1. Both substrates 11,
21 is arranged such that the surface 11S of the cathode substrate 11 and the surface 21S of the anode substrate 21 face each other in parallel.
1S and 21S form the inner surface of the vacuum container 2. The substrates 11 and 21 and the frame 30 are made of an insulating material such as glass.

The display device 1 includes a cold cathode 1 inside a vacuum container 2.
2, ribs 13, gate electrodes 14, frit glass 15,
An anode 22 and a phosphor 23 are further provided.

More specifically, a plurality of ribs 13 extend in a predetermined direction (here, in the vertical direction of the screen) on the surface 11S of the cathode substrate 11, and between adjacent ribs 13 on the surface 11S. A strip-shaped cold cathode 12 extends in each of the above. The rib 13 is larger than the cold cathode 12 in the dimension in the direction perpendicular to the surface 11S of the cathode substrate 11.

A plurality of strip-shaped gate electrodes 14 extend three-dimensionally (in a plane view (see FIG. 2) orthogonally) with the cold cathode 12 in a three-dimensional manner. At this time, the (three-dimensional) intersections between the cold cathodes 12 and the gate electrodes 14 are defined in a matrix, and each intersection corresponds to one display cell (also simply referred to as “cell”) 3 on the screen.

In particular, the gate electrode 14 has a positioning hole 14a.
And the rib 13 is provided on the surface 1 of the cathode substrate 11.
The protrusion 13a is provided on the top opposite to 1S (in other words, on the side of the anode substrate 21). The protrusion 13a of the rib 13 is inserted into the positioning hole 14a of the gate electrode 14. The height of the convex portion 13a of the rib 13 is equal to the height of the gate electrode 14
The thickness of the protrusion 13a is greater than the thickness of the protrusion 13a and protrudes from the positioning hole 14a. Frit glass 15 is attached to the protruding portion.
Are provided and the gate electrode 14 is fixed.

The gate electrode 14 has a mesh opening 14b at each portion facing the cold cathode 12 or at each intersection described above.
Are formed. However, in order to avoid complication of the drawing, detailed illustration of the mesh shape is omitted.

The ribs 13 are formed at a desired height by, for example, a multi-layer printing method. Specifically, by repeating printing, drying, and baking of the insulating paste, a plurality of (here, four layers as an example) insulating films 13b, 13c, 13d, and 13e are formed on the surface 11S of the cathode substrate 11. The insulating film 13e is laminated in this order, and the insulating film 13e is formed on the insulating film 13e by changing the printing pattern from the insulating film 13e.

Note that, unlike the illustration of FIG. 2, the protrusion 13a is
May be formed to have the same width as the insulating films 13b to 13e (dimension in the direction crossing the extending direction of the ribs or in the extending direction of the gate electrode 14).

The cold cathode 12 is formed by a printing method using a paste of a carbon material such as carbon nanotube. According to the printing method, the cold cathode 12 can be formed more simply and at lower cost than the semiconductor manufacturing process.

On the other hand, on the surface 21S of the anode substrate 21,
The phosphors 23 are applied so as to face the mesh openings 14b of the gate electrode 14 (thus, the phosphors 23 are arranged in a matrix). Furthermore, the surface 2 of the anode substrate 21
An anode 22 is formed on the 1S so as to cover the phosphor 23. The anode 22 may be provided for each phosphor.

In the display device 1, the electrons emitted from the cold cathode 12 are extracted by (the potential of) the gate electrode 14, pass through the mesh opening 14b, and collide with the phosphor 23 facing the mesh opening 14b. To do. The phosphor 23 emits light due to the collision of the electrons. Each phosphor 23 corresponds to one display cell 3 on the screen, and the emission of the phosphor 23 causes the cell 3 to emit light. At this time, the second substrate 20 or the anode substrate 21 forms a display surface or a screen. In the case of color display, one pixel is formed by a cell group including the phosphor 23 or the cell 3 that emits red (R), green (G), and blue (B), for example.

In particular, among the strip-shaped cold cathodes 12, each cell 3
Each of the portions included in the above (including each portion facing each mesh opening 14b) corresponds to an electron emission source 12b (see FIG. 3) for causing the corresponding phosphor 23 to emit light.
At this time, the electron emission source 12b and the gate electrode 14 face each other.

Since the convex portion 13a of the rib 13 is inserted into the positioning hole 14a of the gate electrode 14 as described above,
Compared with the conventional display device 1P in which only both ends of the gate electrode 14 are fixed, the gate electrode 14 can be accurately arranged in a plane parallel to the surface 11S of the cathode substrate 11. Therefore, the mesh openings 14b of the gate electrode 14 can be appropriately arranged, and the spread of the electron beam can be made similar in all cells 3.

At this time, since the formed film thickness can be controlled with high accuracy by the printing method, the rib 13 having a uniform height up to the insulating film 13e immediately below the convex portion 13a is formed on the entire first substrate 10. be able to. Therefore, the gate electrode 14 can be arranged with sufficient parallelism to the surface 11S or the cold cathode 12.

Furthermore, since the gate electrode 14 is fixed by the frit glass 15, the deformation of the gate electrode 14 is suppressed. Therefore, the gate electrode 14 and the cold cathode 12
Can be made uniform over the entire first substrate 10, and thus the electric field in the vicinity of the cathode 12 and the electron emission amount can be made the same in all cells 3.

Therefore, it is possible to reduce variations among the display cells 3 in various controls relating to electron emission (for example, spread of electron beam, electric field in the vicinity of the cold cathode 12 and control of electron emission amount). As a result, according to the display device 1, it is possible to obtain a high-quality display in which defects such as uneven brightness are suppressed.

Further, as described above, the cold cathodes 12 are arranged between the adjacent ribs 13, and the cold cathodes 12 and the ribs 13 are alternately arranged. Therefore, the ribs 13 (of which, the portions on both sides of each cell 3) are arranged in a part of the periphery of the electron emission source 12b, and the ribs 13 extend in a direction intersecting the extending direction of the ribs 13 (that is, the extending direction of the gate electrode 14). The electron emission sources 12b arranged side by side (in the present direction) are partitioned. Therefore, the electrons emitted from the electron emission source 12b are prevented from heading to the mesh opening 14b of the adjacent display cell 3 via the rib 13, so that erroneous light emission is prevented between the adjacent display cells 3.

Also, by using carbon nanotubes for the cold cathode 12, the life of the electron emission source 12b, and thus of the display device 1, can be extended.

It is possible to prevent erroneous light emission by using the first substrate 10A shown in the plan view of FIG. 4 instead of the first substrate 10. The first substrate 10A includes a grid-shaped rib 113 instead of the rib 13 in the above-described first substrate 10. First
In the substrate 10A, the arrangement position, dimensions, etc. of the ribs 113 are determined so that the electron emission sources 12b are arranged in the lattice-shaped window, and each electron emission source 12b is entirely surrounded by the ribs 113. .

Further, instead of the first substrates 10 and 10A, the first substrate 10B shown in the plan view of FIG. 5 can be applied to the display device 1. The first substrate 10B is the first substrate 10A described above.
In place of the cold cathode 12, an electrode or wiring 112 including a base electrode 112a and a cold cathode (or an electron emission source) 112b is provided.

Specifically, the base electrode 112a is formed in a strip shape between the adjacent ribs 13 on the surface 11S of the cathode substrate 11 as in the cold cathode 12 described above, and a plurality of base electrodes 112a are formed on the base electrode 112a. Cold cathode 112b is formed. Each cold cathode 112b is arranged facing the phosphor 23 through the mesh opening 14b of the gate electrode 14 and further through the mesh opening 14b.
12b are not in contact with each other. The base electrode 112a is formed by a printing method using a paste such as silver, and the cold cathode 112b is formed similarly to the cold cathode 12 described above.

In the cold cathode 12 described above, electrons emitted from a portion of the gate electrode 14 which does not face the mesh opening 14b hardly pass through the mesh opening 14b, so that the contribution to light emission is low. On the other hand, according to the electrode 112, unnecessary electron emission can be reduced by not providing the cold cathode 112b in a portion where the contribution to light emission is low. Therefore, the utilization efficiency of the emitted electrons can be improved and the power consumption can be reduced.

In FIG. 5, the electrodes 112 and the grid-like ribs 113 are shown.
Although the configuration in which the above is combined is shown, it is also possible to combine the electrode 112 and the linear rib 13 (see FIGS. 2 and 3).

4 and 5, elements necessary for the above description are extracted and shown, and other configurations not shown are the same as those of the first substrate 10 described above. The first substrate 10A,
10B and the like can be applied to the display device 1 instead of the first substrate 10. Also, the grid-shaped ribs 113 also have convex portions 13a.
Needless to say that it has.

Second Embodiment Now, the first embodiment has described the case where the ribs 13 and 113 are formed by the multi-layer printing method using the insulating paste. At this time, each insulating film 1
3b to 13e may be formed of one kind of insulating paste or plural kinds of insulating paste.

Further, it is possible to use not only the insulating paste but also the conductive paste, and the second embodiment
Now, the first substrate (or the display device substrate) having the ribs thus formed will be described.

FIG. 6 shows a first substrate 10C according to the second embodiment.
A sectional view for explaining The first substrate 10C has a structure in which the ribs 13 in the first substrate 10 (see FIG. 1) described above are replaced with the ribs 213. As can be seen by comparing FIG. 6 and FIG. 1, the rib 213 has conductive films 13f and 13g instead of the insulating films 13c and 13d of the rib 13 described above.
Is included. The rib 213 may be linear like the rib 13 or may be lattice-like like the rib 113.

By the way, there are various printing processes in the manufacturing process of the display device 1. Therefore, for example, the conductive films 13f and 13g can be formed at the same time when the cold cathode 12 and wiring (not shown) are formed by printing. Such simultaneous printing is cold cathode 1
It can be easily realized by changing the pattern of the printing plate used for 2 and wiring. Therefore, the manufacturing process can be simplified and the manufacturing time can be shortened as compared with the case where the ribs are formed by multilayer printing of a single material for forming the ribs.

The use (combined use) of printing processes other than the formation of the ribs is not limited to the case where the rib 213 includes the conductive films 13f and 13g, but the case where the rib is formed by a plurality of kinds of insulating pastes. Is also effective.

At this time, for example, when the ribs 213 having the conductive film 13h in the lowermost layer are formed in a lattice pattern as in the first substrate 10D shown in the sectional view of FIG. 7, the cold cathode 12 is short-circuited via the ribs 213. sell. In other words, if the stacking position is set so that the cold cathode 12 and the gate electrode 14 are not short-circuited via the rib 213, various positions in the rib 213 (the convex portion 1
3a is also included), a conductive film can be used.

Alternatively, the above short circuit can be prevented by designing the plan view pattern of the ribs. For example, by forming the rib 213 of the first substrate 10D of FIG. 7 in the pattern shown in the plan view of FIG. 8, it is possible to prevent a short circuit.

Specifically, the rib 213 of the first substrate 10D shown in FIG. 8 does not contact the plurality of cold cathodes 12 at the portion extending in the direction intersecting with the cold cathodes 12 in the above-mentioned grid-like ribs. It corresponds to the divided pattern. In other words,
The rib 213 has a comb-like shape (a portion extending along the cold cathode 12 (corresponding to the rib 13 in FIG. 2) corresponds to the back of the comb, and a plurality of ribs intersect the cold cathode 12 and extend. Part corresponds to the comb teeth).

On the contrary, for example, in the case of the rib 213 obtained by replacing the layer (corresponding to the above-described insulating film 13e) immediately below the convex portion 13a in the ribs 13 and 113 with a conductive film, the cold cathode 12 is used. A short circuit between the gate electrodes 14 can be prevented by dividing a portion (a portion corresponding to the rib 13) extending along the gate electrode. Also, the grid-shaped ribs 213
The shape may be such that the intersection portion is deleted in.

The periphery of the electron emission source 12b is also surrounded by these divided ribs 213, and is arranged in a direction intersecting the extending direction of the cold cathode 12, or further in the extending direction of the cold cathode 12. The aligned electron emission sources 12b are partitioned.

The rib 213 having a conductive film may be combined with the above-mentioned electrode 112 (see the first substrate 10E shown in the plan view of FIG. 9), and the various shapes of the rib 213 described above are conductive. It goes without saying that the present invention can also be applied to ribs that do not include a flexible film.

6 to 9, elements necessary for the above description are extracted and shown, and other configurations not shown are the same as those of the first substrate 10 described above. First substrate 10C, 1
0D, 10E, etc. can be applied to the display device 1 instead of the first substrate 10. In addition, the rib 21 having a conductive film
It goes without saying that 3 also has the convex portion 13a.

<Modifications Common to Embodiments 1 and 2> Instead of the cold cathodes 12 and 112b, a hot cathode can be used as an electron emission source.

[0061]

According to the first aspect of the present invention, since the convex portion of the rib is inserted in the positioning hole of the gate electrode, the accuracy is higher than that of the conventional structure in which only both ends of the gate electrode are fixed. A well-arranged gate electrode can be provided. For this reason, it is possible to reduce variations among display cells regarding various controls related to electron emission. Therefore, it is possible to provide a display device capable of high-quality display in which defects such as uneven brightness are suppressed.

According to the second aspect of the present invention, the rib made of the multilayer film can be formed by utilizing various printing steps in the manufacturing process of the display device. Therefore, the manufacturing process can be simplified and the manufacturing time can be shortened as compared with the case where the ribs are formed by multilayer printing of a single material.

According to the invention of claim 3, since the gate electrode is fixed by the frit glass, the deformation of the gate electrode can be suppressed. For this reason, it is possible to reduce variations among display cells regarding various controls related to electron emission. Therefore, it is possible to obtain a high quality display in which defects such as uneven brightness are suppressed.

According to the invention of claim 4, erroneous light emission can be prevented between adjacent display cells.

According to the fifth aspect of the present invention, the life of the electron emission source and thus of the display device can be extended.

According to the sixth aspect of the present invention, since the rib protrusions are inserted into the positioning holes of the gate electrode, the ribs can be arranged more accurately than the conventional structure in which only both ends of the gate electrode are fixed. A gate electrode can be provided. For this reason, it is possible to reduce variations among display cells regarding various controls related to electron emission. Therefore, it is possible to provide a display device capable of high-quality display in which defects such as uneven brightness are suppressed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining a display device according to a first embodiment.

FIG. 2 is a plan view for explaining the display device substrate according to the first embodiment.

FIG. 3 is a plan view for explaining the display device substrate according to the first embodiment.

FIG. 4 is a plan view for explaining a second display device substrate according to the first embodiment.

FIG. 5 is a plan view for explaining a third display device substrate according to the first embodiment.

FIG. 6 is a cross-sectional view illustrating a display device substrate according to a second embodiment.

FIG. 7 is a cross-sectional view illustrating a second display device substrate according to the second embodiment.

FIG. 8 is a plan view for explaining a second display device substrate according to the second embodiment.

FIG. 9 is a cross-sectional view for explaining a third display device according to the second embodiment.

FIG. 10 is a cross-sectional view for explaining a conventional display device.

FIG. 11 is a plan view for explaining a conventional display device.

FIG. 12 is a diagram for explaining electron emission characteristics of a cold cathode.

[Explanation of symbols]

1 display device, 2 vacuum container, 3 cells, 10, 10A
10E First substrate (display device substrate), 11 Cathode substrate, 12 Cold cathode, 12b Electron emission source, 13, 11
3, 213 rib, 13a convex portion, 13b to 13e insulating film, 13f to 13h conductive film, 14 gate electrode, 14a positioning hole, 15 frit glass, 11
2b Cold cathode (electron emission source).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaaki Kai             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5C031 DD17                 5C036 EE15 EF01 EF06 EG12 EG17                       EH10

Claims (6)

[Claims] 1. A vacuum container, an electron emission source arranged in the vacuum container, a gate electrode having a positioning hole arranged facing the electron emission source, and the electron emission in the vacuum container. A rib disposed adjacent to the source and having a convex portion inserted into the positioning hole of the gate electrode. 2. The display device according to claim 1, wherein the rib is formed of a multilayer film of at least two kinds of materials. 3. The display device according to claim 1, further comprising a frit glass which is provided on the convex portion of the rib and fixes the gate electrode. 4. The display device according to claim 1, further comprising a plurality of the electron emission sources, wherein the rib is arranged so as to partition the plurality of electron emission sources. There is a display device. 5. The display device according to claim 1, wherein the electron emission source includes a cold cathode made of a carbon-based material containing carbon nanotubes. 6. An insulating substrate, an electron emitting source arranged on the insulating substrate, a gate electrode having a positioning hole arranged facing the electron emitting source, and on the insulating substrate. A display device substrate, comprising a rib that is disposed adjacent to the electron emission source and that has a convex portion that is inserted into the positioning hole of the gate electrode.