JP2000030640A - Luminescence element for display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminescence element for a display device preventing an intra-tube electric discharge caused by a conductive paste and having high quality. SOLUTION: This luminescence element is provided with a vacuum container 1 having a front panel 2 and a back panel 3, a fluorescent screen 106 formed on the inner face of the front panel 2, multiple recesses 27 formed on the back panel 3, an exhaust port 18 provided in the region other than multiple recesses 2 7, multiple external electrodes provided in the region other than multiple recesses 27, multiple cold cathode substrates 26 fitted to multiple recesses 27, an insulating plate 29 arranged between the front panel 2 and the back panel 3 and covering multiple cold cathode substrate end sections and external electrodes, scanning electrodes formed on the faces of multiple cold cathode substrates 26 and connected to the external electrodes, multiple cold cathodes connected to the scanning electrodes and emitting electrons, and gate electrodes surrounding the cold electrodes and connected to the external electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device using a cold cathode used for a large screen display device such as an aurora vision.

[0002]

2. Description of the Related Art In recent years, with the increase in screen size of display devices, flat panel display devices (flat panel displays) have been increasingly developed. Among them, a field emission type cathode arranged in a plane, that is, a cold cathode (Cold Catho)
de), a field emission display device (F
ED: Field Emission Display
y) is attracting attention as a self-luminous display device capable of realizing high luminance, a wide viewing angle, high-speed response, and low power consumption.

FIG. 16 shows that the inventor of the present invention disclosed in Japanese Patent Application No. 9-2773.
FIG. 1 is a schematic cross-sectional view showing a light emitting element of a display device using a cold cathode disclosed in No. 77, which is applied to a color large-screen display device such as Aurora Vision. In the figure, reference numeral 1 denotes a vacuum vessel, in which a transparent front panel 2 and a rear panel 3, which are disposed to face each other at a distance of about 5 to 10 mm, sandwich a rectangular frame-shaped glass spacer 4 therebetween. And is hermetically sealed. A substantially square phosphor 10 having red R, green G, and blue B regions is provided on the inner surface of the front panel 2.
6 (several mm square) is applied in a matrix,
The phosphor screen 6 is formed. An aluminum back anode 9 is formed on the entire phosphor screen 6 for the purpose of increasing the luminous efficiency and functioning as an anode for electron acceleration.

FIG. 17 is a schematic sectional view taken along the line DD of FIG. 16, and FIG. 18 is a schematic sectional view taken along the line EE of FIG. As shown in FIG. 17 and FIG.
A plurality of cold cathode substrates 26 each having a thickness of about 1 mm are arranged on the rear panel 3. On the surface (front surface) of the cold cathode substrate 26, a large number of cold cathode groups 20 are formed in a matrix at positions corresponding to the respective phosphors 106 constituting the phosphor screen 6. FIG. 19 shows a front panel 2 and spacers 4, which are main components of a light emitting element, and a cold cathode substrate 2
FIG. 6 is an exploded perspective view of the rear panel 3 as viewed from the front side.

FIG. 20 is an enlarged view showing a portion V in FIG. 16 and schematically shows the configuration of the cold cathode group 20. As shown in FIG. FIG.
Although the phosphor 106 and the cold cathode group 20 are shown in substantially the same size in the figure, in practice, the cold cathode group 20 takes into account the divergence angle of light from the corresponding phosphor of several mm square. It is made small similarly (for example, 0.3 mm to several mm
Corner). On the surface of the cold cathode substrate 26, for example, niobium, gold,
Scan electrodes 22 made of a metal such as chromium are formed in a matrix, and on the surface thereof, an insulating layer 56 having thousands to tens of thousands of holes and a gate electrode made of a metal such as niobium, tantalum, and molybdenum are provided. 55 are stacked. The holes of the insulating layer 56 and the gate electrode 55 have a diameter of about 1 μm and are arranged in a matrix at intervals of about 5 to 10 μm. In each of the holes, a conical cold cathode 23 (bottom diameter: about 1 μm) electrically connected to the scanning electrode 22 by depositing a metal such as tungsten or molybdenum.
m) is formed. Therefore, the tip portions of the thousands of cold cathodes 23 are each surrounded by the gate electrode 55.

FIG. 21 shows a front view of the cold cathode substrate 26.
In the figure, a group of cold cathodes 20 composed of thousands of conical cold cathodes 23 are arranged in a matrix, and these electrode groups are composed of a scanning electrode wiring layer 22a and a gate electrode wiring layer 55a.
Is connected to the land 34 at the end.

FIG. 22 shows a front view of the back panel 3. As shown in FIG. In the figure, a portion surrounded by a dashed line is a portion on which the cold cathode substrate 26 is mounted, 16 is an external electrode for electrical connection with the outside, 31 is a land for electrical wiring, and 30 is a wiring for electrical connection. Reference numeral 33 denotes an adhesive such as a conductive paste for transmitting a signal to an external electrode. In this state, the cold cathode substrate 26 is placed on the area indicated by the dashed line,
4 are installed so as to overlap each other. The lands 31 and 34 are electrically connected by a conductive paste (silver paste) 32 applied thereto as shown in FIG. Thus, the external electrode 16 is connected to the predetermined scanning electrode 22 or the gate electrode 55. As a result, the plurality of scan electrode wiring layers 22a
And among the intersections of the plurality of gate electrode wiring layers 55a, the cold cathode groups 20 at the intersections of the wiring layers reaching a predetermined voltage are turned on.

A plurality of exhaust ports 1 are provided at the center of the back panel 3.
8 (approximately 3 to 5 mm in diameter) are opened, and an exhaust port 18 is connected to an exhaust pipe 17 whose tip is enlarged. A plurality of getters 14 for adsorbing gas to increase the degree of vacuum are provided in the enlarged portion. A power supply line 10 for supplying a predetermined potential to the aluminum back anode 9 is connected to the aluminum back anode 9 from outside through an exhaust pipe 17 and an exhaust port 18.

The light-emitting elements having such a configuration are arranged vertically and horizontally in a predetermined matrix so as to constitute a large-screen display device. Here, when the gap between the adjacent light emitting elements is large, there is a problem that the boundary portion (seam, seam) is noticeable when the entire screen is viewed. Therefore, it is desirable that the distance between the adjacent light emitting elements is as small as possible. For that purpose, the external electrodes 16 and the exhaust pipe 17 are provided on the back side.

The operation of the light emitting device will be described. The inside of the vacuum vessel 1 is evacuated from the exhaust pipe 17 to a predetermined vacuum state. In addition, a predetermined voltage is applied between the scanning electrode 22 and the gate electrode 55 via the predetermined external electrode 16, and
0, a predetermined voltage for electron acceleration is applied to the aluminum back anode 9. When the voltage between the scanning electrode 22 and the gate electrode 55 reaches several tens of volts, the bottom is connected to the scanning electrode 22 and the tip is the cold cathode 23 surrounded by the gate electrode 55.
The electrons are emitted from the tip of the light emitting device and head toward the fluorescent screen 6. The electrons are accelerated by the high voltage applied to the aluminum back anode 9 and collide with the phosphor 106 to emit light.

A gas generated when electrons collide with the phosphor 106 and emit light passes through a plurality of exhaust ports 18 formed in the back panel 3 and is formed on the tip surface of the exhaust pipe 17 by the flash of the getter 14. The getter film is adsorbed. Thereby, the high vacuum state in the vacuum vessel 1 is maintained.

[0012]

It is important for a light-emitting element for a large-screen display to have no failure and high reliability. However, in the case of this light-emitting element, when the anode is set to a high voltage in order to illuminate the phosphor with high brightness, the conductive paste 3 for electrical connection shown in FIGS.
2, a discharge in the tube is generated, and a sufficiently high voltage cannot be applied. As a result, high luminance cannot be obtained. This is because the conductive paste generally has a drawback that when it is placed in a vacuum environment, it dries and its surface becomes lumpy, and when viewed microscopically, protrusions are formed on the surface, which becomes a starting point of discharge in the tube. .

The present invention has been made in view of such circumstances, and a plurality of cold cathode substrates are mounted in recesses of a back panel 3, and a suitable insulating plate such as glass is placed on a conductive paste for electrical connection. And a new mesh-shaped grid electrode is provided between the front panel 2 and the rear panel 3 to prevent the occurrence of discharge in the tube beforehand, and to provide a high-luminance and highly reliable light-emitting element. The purpose is to:

[0014]

A light emitting device of a display device according to the present invention comprises a vacuum vessel having a front panel and a back panel, a phosphor screen formed on an inner surface of the front panel, and a plurality of phosphor screens formed on the back panel. Concave portion, an exhaust port opened in a region other than the plurality of concave portions, a plurality of external electrodes penetrated in the region other than the plurality of concave portions, and a plurality of cold cathodes mounted in the plurality of concave portions. A substrate, disposed between the panel and the back panel, an insulating plate covering a plurality of cold cathode substrate ends and external electrodes, and formed on each surface of the plurality of cold cathode substrates and connected to the external electrodes. Scanning electrode, a plurality of cold cathodes connected to the scanning electrode and emitting electrons, and a gate electrode surrounding each cold cathode and connected to an external electrode.

Further, the insulating plate of the light emitting element of the display device according to the present invention is characterized in that the insulating plate is a glass plate having a thickness of 5 mm or less, a width of 20 mm or less, and a length of 100 mm or less.

Further, the insulating plate of the light emitting element of the display device according to the present invention is obtained by applying a conductive film to the surface on the fluorescent screen side and setting the potential to a low potential.

Further, the insulating plate of the light emitting element of the display device according to the present invention has a conductive film pattern corresponding to the land pattern formed on the back panel formed on the surface on the back panel side.

Further, the light emitting element of the display device according to the present invention comprises: a vacuum vessel having a front panel and a back panel;
A fluorescent screen formed on the inner surface of the front panel, an exhaust port formed on the rear panel, a plurality of external electrodes penetrating through the rear panel, and adhered to an area of the rear panel where the exhaust port is not formed. A plurality of cold cathode substrates, a scan electrode formed on the surface of the cold cathode substrate and connected to the external electrode, a plurality of cold cathodes formed to be connected to the scan electrode and emitting electrons, and each cold cathode And a gate electrode connected to an external electrode, and a mesh grid electrode disposed between the front panel and the rear panel to cover the plurality of cold cathode substrates.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. Note that the same reference numerals as those in the related art indicate the same or equivalent parts as in the related art. Embodiment 1 FIG. FIG. 1 is a schematic sectional view showing a structure of a light emitting element of a display device according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. In the figure, reference numeral 1 denotes a vacuum vessel, in which transparent front and rear panels 2 and 3 which are opposed to each other at a distance of about 5 to 10 mm sandwich a rectangular frame-shaped glass spacer 4 therebetween, and these are made of low melting glass. 5 is hermetically sealed. On the inner surface of the front panel 2, a red R
Phosphor 106 having green G and blue B regions (several mm square)
Are applied in a matrix to form the phosphor screen 6. Increasing the luminous efficiency on the entire phosphor screen 6;
Further, an aluminum back anode 9 intended to function as an anode for electron acceleration is formed.

At the center of the back panel 3, as shown in FIG. 2, a plurality (five in the figure) of exhaust ports 18 are provided in a cross shape. FIG. 3 is a schematic cross-sectional view taken along line BB of FIG. 2. As shown in FIG. 3, a plurality of recesses 27 are formed on the inner surface of the back panel 3 in accordance with the size of the cold cathode substrate 26. Are provided so as not to overlap with the exhaust port 18, and a plurality (four in the figure) of cold cathode substrates 26 made of, for example, glass or ceramics having a thickness of about 1 mm are bonded with the low-melting glass 5 a to form a recess 27 in the recess 27. It is embedded in.
Further, as shown in FIG. 1, an exhaust pipe 17 having a large diameter connection portion is connected to the outer surface of the back panel 3 so as to cover all the exhaust ports 18. A getter 14 for adsorbing gas is provided inside the large diameter portion of the exhaust pipe 17.

FIG. 2 shows the front surface (front surface) of the cold cathode substrate 26.
As shown in the figure, cold cathode groups 20 to be described later are formed in a matrix at positions corresponding to the respective phosphors 106 constituting the phosphor screen 6, and the end of the cold cathode substrate 26 is made of thin glass or the like. Insulating plate 29 is provided to cover the conductive paste portion. Further, as will be described later in detail, the plurality of external electrodes 16 are provided in a cross shape avoiding the recess 27 of the back panel. FIG. 3 shows a state in which the insulating plate 29 covers the end lands 34 of the cold cathode substrate 26 and the conductive paste on the ends of the external electrodes 16 inserted through the back panel 3. FIG. 4 is an exploded perspective view of the front panel 2, the spacer 4, the cold cathode substrate 26, and the rear panel 3, which are main components of the light emitting element, as viewed from the front.

FIG. 5 is an enlarged view showing a portion V in FIG.
The configuration of the cold cathode group 20 is schematically shown. In FIG. 5, the phosphor 106 and the cold cathode group 20 are shown to have substantially the same size, but in reality, each cold cathode group 20 has a corresponding divergence angle of light from the phosphor 106 of several mm square. In consideration of this, they are similarly made smaller (for example, 0.3 mm square). Cold cathode substrate 2
The surface of No. 6 has this size, for example, niobium, gold,
The scanning electrodes 22 made of a metal such as chromium are formed in a matrix, and on the surface thereof, an insulating layer 56 having thousands of holes and a gate electrode 55 made of a metal such as niobium, tantalum, molybdenum are stacked. Have been. The holes of the insulating layer 56 and the gate electrode 55 have a diameter of about 1 μm and are arranged in a matrix at intervals of about 5 to 10 mm.
In each of the holes, a conical cold cathode 23 (bottom diameter: about 1 μm) electrically connected to the scanning electrode 22 is formed by evaporating a metal such as tungsten or molybdenum. Therefore, the tip portions of the thousands of cold cathodes 23 are each surrounded by the gate electrode 55.

FIG. 6 is a schematic front view of the rear panel 3. As shown in FIG. 6, a large number of crosses are formed on the rear panel 3 so as to avoid the recesses 27 for mounting the cold cathode substrates 26 thereon. Through holes are formed, and each through hole has a scanning electrode 2.
In order to apply a control voltage to 2 or the gate electrode 55, a predetermined number of external electrodes 16 are inserted from the outside in close contact with the through holes. The tip of the external electrode 16 inserted into the through hole is slightly recessed from the surface (front surface) of the back panel 3, and a conductive paste (for example, silver paste) 33 is provided at that position, as shown in FIG. For example, a rectangular shape is applied so as to electrically connect 16 and land 31.
The plurality of lands 31 are formed to be elongated on the surface of the back panel 3 so as to connect the adjacent regions of the two cold cathode substrates 26, and one end of each of the lands 31 and the external electrode 16 are electrically conductive. They are electrically connected via a paste 33.

FIG. 7 is a schematic front view of the cold cathode substrate 26. On the surface (front panel side) of the cold cathode substrate 26, as shown in FIG.
A plurality of scan electrode wiring layers 22a connecting the two are formed in the vertical direction, and their ends are respectively connected to a plurality of lands 34 provided on the edge (lower side) of the cold cathode substrate 26. Further, a plurality of gate electrode wiring layers 55a connecting the gate electrodes 55 of the cold cathode groups 20 arranged in the horizontal direction are formed in a large number in the horizontal direction, and the ends thereof are other edges (right side) of the cold cathode substrate 26. Are connected to a plurality of lands 34 provided at the same time.

Then, on the surface of the rear panel 3 shown in FIG.
A cold cathode substrate 26 as shown in FIG. 7 is placed such that the corresponding lands 31 and 34 overlap each other, and these lands 31 and 34 are connected by a coated conductive paste (silver paste) 32. (See FIGS. 2 and 3). Thus, the external electrode 16 is connected to the predetermined scanning electrode 22 or the gate electrode 55. As a result, the plurality of scan electrode wiring layers 22
Among the a and the gate electrode wiring layer 55a, the cold cathode group 20 at the intersection of the wiring layers reaching a predetermined voltage is turned on. A power supply line 10 for supplying a predetermined potential to the aluminum back anode 9 is provided with an exhaust pipe 17 and one exhaust port 1 from outside.
8 and connected to an aluminum back anode 9. Although not shown, a tube made of thin glass or the like is covered on the surface of the power supply line 10 for insulation.

The gas generated when the electrons collide with the phosphor 106 and emit light passes through a plurality of exhaust ports 18 formed in the back panel 3 and passes through a getter formed in the large diameter portion of the exhaust pipe 17. It is adsorbed by 14. Thereby, the high vacuum state in the vacuum vessel 1 is maintained.

As described above, the light emitting device of the present embodiment has the cold cathode substrate 26 fitted in the recess formed in the rear panel, and the land 34 at the end of the cold cathode substrate 26 and the rear panel. The conductive paste 32 for connecting to the land 31 in 3 is covered with an insulating plate 29 such as glass. Also, a conductive paste 33 applied to electrically connect the end of the external electrode 16 to the land 31 formed on the back panel side is formed on the insulating plate 29.
Covered with. That is, since neither of the conductive pastes 31 and 32 is exposed when viewed from the anode side, the effect of the high voltage does not reach the conductive paste portion, and there is no fear that a discharge in the tube is generated starting therefrom. Therefore, it is not necessary to worry about the discharge in the tube, and a high voltage can be applied to the anode without worry, and high luminance can be obtained.

FIG. 8 shows an example of the shape of the insulating plate 29 in the present embodiment. As shown in the figure, the insulating plate 29 was formed of a glass plate having a thickness of 1 mm, a width of 5 mm, and a length of 30 mm. By using a plurality of (four in the figure) insulating plates 29 having such a shape in the light emitting device shown in FIGS. 1 and 2, the insulating plate 29 is provided at the end of the external electrode 16 and the end of the cold cathode substrate 26. Since it is not necessary to expose the conductive paste applied to the land portions, the influence of the high voltage does not reach the conductive paste portion, and there is no danger that an in-tube discharge is generated starting there. Therefore, there is no need to worry about the discharge in the tube, and high luminance can be obtained by applying a high voltage to the anode.

However, in general, since the surface (anode side) of the insulating plate 29 is an insulator, there is a drawback that the potential is not determined due to the influence of static electricity. However, in this case, the surface area of the insulating plate 29 is small. It is thought that there is no real harm.
In addition, if the shape of the insulating plate 29 is 5 mm or less in thickness, 20 mm or less in width, and 100 mm or less in length, the disadvantage that the potential is not determined due to the influence of static electricity does not appear remarkably.
It was confirmed experimentally that there was no practical problem.

Embodiment 2 FIG. FIG. 9 shows an example of an insulating plate 29 having a conductive film applied to the surface (anode side).
By using such an insulating plate 29, the insulating plate 29
For example, by electrically connecting the conductive film 30 applied to the surface of the semiconductor device to any one of the many external electrodes 16,
Since the potential can be made as low as the gate voltage (several tens of volts), the potential when the surface (anode side) of the insulating plate 29 is an insulator is not determined, and a high voltage is applied to the anode without worry and high brightness is obtained. Can be obtained.

Embodiment 3 FIG. 10 shows an example of the insulating plate 29 in which a plurality of conductive films 30 corresponding to a wiring pattern are applied to the back surface (the rear panel side) of the insulating plate 29. The patterns of the plurality of conductive films 30 correspond to the wiring patterns of the lands 31 on the rear panel of FIG. 6, and not only eliminate the discharge in the tube but also further increase the accuracy of the electrical connection.
The reliability of the element can be improved.

Embodiment 4 FIG. FIG. 11 is a schematic cross-sectional view illustrating a structure of a light emitting element in Embodiment 4. As shown in the figure, the present embodiment is characterized in that a grid electrode 40 made of a mesh-like thin metal is newly disposed between the front panel 2 and the rear panel 3. FIG. 12 is a perspective view showing an example of a schematic structure of the grid electrode 40, and FIG. 13 is a cross-sectional view taken along line CC in FIG. As shown in the figure, a small hole 41 for passing the power supply line 10 wrapped in protective glass is provided at a substantially central portion of the grid electrode 40. The grid electrode 40 is arranged as far away from the front panel 2 as the anode as far as possible and several mm away from the cold cathode substrate 26,
The potential of the grid is set to a low potential (about several hundred volts).

FIG. 14 is an exploded perspective view of the front panel 2, the spacer 4, the grid electrode 40, the cold cathode substrate 26, and the rear panel 3, which are main components of the light emitting device in the present embodiment, as viewed from the front. It is. Further, FIG.
FIG. 12 is an enlarged view showing a portion V in FIG. 11 and shows a state in which a grid electrode 40 is provided on the cold cathode group 20.

Next, the operation of the light emitting device will be described. The inside of the vacuum vessel 1 is evacuated from the exhaust pipe 17 to a predetermined vacuum state. Further, a predetermined voltage is applied between the scanning electrode 22 and the gate electrode 55 via the plurality of external electrodes 16, and a predetermined voltage for electron acceleration is applied to the aluminum back anode 9 via the power supply line 10. Scanning electrode 22, gate electrode 5
When the voltage between the electrodes 5 reaches several tens of volts, the bottom is connected to the scanning electrode 22, and the tip is discharged from the tip of the cold cathode 23 surrounded by the gate electrode 55, and the gate electrode 5
The light passes through the mesh of the grid electrode 40 set to a potential somewhat higher than 5 (about one hundred to several hundred V), and travels toward the phosphor screen 6. The electrons are accelerated by the high voltage applied to the aluminum back anode 9 and collide with the phosphor 106 to emit light. FIGS. 12 and 13 show examples of the dimensions of the grid electrode 40 (0.2 mm in thickness and width in width) suitable when the outer dimensions of the light emitting element are good enough to incorporate a grid electrode of about 80 mm square. 80 mm, length 80 mm, bending allowance 3 mm).

As described above, in the present embodiment, the conductive paste 32 applied for electrically connecting the land 31 on the rear panel side and the land 34 on the end side of the cold cathode substrate 26 is applied to the insulating plate 29. Instead of covering with grid electrode 4
0 is disposed between the front panel 2 and the rear panel 3 to cover the surface of all the cold cathode substrates, so that the effect of the high voltage does not reach the conductive paste portion. Therefore,
Embodiments 1 to 3 (although the electrons hit the grid electrode 40 become heat and do not contribute to light emission)
Similarly to the above, it is not necessary to worry about the discharge in the tube, and a high voltage can be applied to the anode without worry, and high brightness can be obtained.

[0036]

The light emitting element of the display device according to the present invention is:
A vacuum vessel having a front panel and a back panel, a fluorescent screen formed on the inner surface of the front panel, a plurality of recesses formed in the back panel, and an exhaust port opened in a region other than the plurality of recesses, A plurality of external electrodes penetrated in a region other than the plurality of recesses, a plurality of cold cathode substrates mounted on the plurality of recesses, and a plurality of cold cathodes disposed between the front panel and the back panel. An insulating plate covering the end of the substrate and the external electrode,
A scanning electrode formed on each surface of the plurality of cold cathode substrates and connected to the external electrode, a plurality of cold cathodes connected to the scanning electrode and emitting electrons, and surrounding each cold cathode, an external electrode When viewed from the anode side, neither of the conductive pastes 31 and 32 is covered with the insulating plate, and is not exposed. Therefore, there is no fear that the discharge in the tube is generated from the starting point. Therefore, there is no need to worry about the discharge in the tube, and there is an effect that a high voltage can be applied to the anode without worry and high brightness can be obtained.

The insulating plate of the light emitting element of the display device according to the present invention has a thickness of 5 mm or less, a width of 20 mm or less, and a length of 1 mm or less.
Since the glass plate is not more than 00 mm, there is an effect that a high voltage can be applied to the anode and a high luminance can be obtained without the disadvantage that the potential is not determined due to the influence of static electricity.

Further, the insulating plate of the light emitting element of the display device according to the present invention is formed by applying a conductive film on the surface on the phosphor screen side and setting the potential to a low potential, so that the potential on the surface of the insulating plate becomes stable. There is an effect that a high voltage can be applied to the anode with a sense of security and high luminance can be obtained.

Further, since the insulating plate of the light emitting element of the display device according to the present invention has the conductive film pattern corresponding to the land pattern formed on the back panel on the surface on the back panel side, only discharge in the tube is eliminated. In addition, there is an effect that the accuracy of electrical connection can be further increased and the reliability of the element can be increased.

Further, the light emitting element of the display device according to the present invention comprises: a vacuum container having a front panel and a back panel;
A fluorescent screen formed on the inner surface of the front panel, an exhaust port formed on the rear panel, a plurality of external electrodes penetrating through the rear panel, and adhered to an area of the rear panel where the exhaust port is not formed. A plurality of cold cathode substrates, a scan electrode formed on the surface of the cold cathode substrate and connected to the external electrode, a plurality of cold cathodes formed to be connected to the scan electrode and emitting electrons, and each cold cathode And a gate electrode connected to an external electrode, and a mesh grid electrode disposed between the front panel and the rear panel so as to cover all the cold cathode substrates. Since the influence does not reach the conductive paste part on the cold cathode substrate, there is no need to worry about the discharge in the tube, so apply a high voltage to the anode with confidence,
There is an effect that high luminance can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a schematic structure of a light-emitting element in Embodiment 1.

FIG. 2 is a schematic sectional view taken along line AA in FIG.

FIG. 3 is a schematic sectional view taken along line BB of FIG.

FIG. 4 is an exploded perspective view showing main components of the light emitting element in Embodiment 1.

FIG. 5 is an enlarged view showing a portion V in FIG. 1;

FIG. 6 is a schematic front view of a rear panel.

FIG. 7 is a schematic front view of a cold cathode substrate.

FIG. 8 is a diagram showing a shape of an insulating plate according to the first embodiment.

FIG. 9 is a schematic diagram showing an insulating plate according to the second embodiment.

FIG. 10 is a schematic diagram showing an insulating plate according to a third embodiment.

FIG. 11 is a schematic cross-sectional view illustrating a schematic structure of a light-emitting element in Embodiment 4.

FIG. 12 is a perspective view showing a structure of a grid electrode.

FIG. 13 is a sectional view taken along line CC in FIG.

FIG. 14 is an exploded perspective view showing main components of the light emitting device shown in FIG.

FIG. 15 is an enlarged view showing a portion V in FIG. 11;

FIG. 16 is a schematic cross-sectional view showing a schematic structure of a conventional light emitting device.

FIG. 17 is a schematic sectional view taken along line DD in FIG. 16;

18 is a schematic sectional view taken along line EE in FIG.

FIG. 19 is an exploded perspective view showing main components of the conventional light emitting device shown in FIG.

20 is an enlarged view showing a portion V in FIG.

FIG. 21 is a schematic front view of a cold cathode substrate.

FIG. 22 is a schematic front view of a conventional back panel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum container 2 Front panel 3
Back panel 4 Spacer 9 Aluminum back anode, 16
External electrode 18 Exhaust port 20 Cold cathode group 2
2 Scanning electrode 22a Scanning electrode wiring layer 23 Cold cathode
26 Cold Cathode Substrate 27 Depression 29 Insulating Plate 31 34 Land 32, 33 Conductive Paste 40 Grid Electrode 41 Hole 55 Gate Electrode 55a Gate Electrode Wiring Layer 106 Phosphor Screen

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Fujikawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Akihiko Hosono 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Shuji Iwata 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C031 DD09 DD16 DD17 DD20 5C032 AA01 AA06 FF03 FF05 5C036 EE19 EF14 EG02 EG07 EG12 EG16 EG33 EG50 EH04 EH06

Claims (5)

[Claims] A vacuum vessel having a front panel and a back panel; a phosphor screen formed on an inner surface of the front panel; a plurality of recesses formed on the back panel; and a region other than the plurality of recesses. A plurality of external electrodes provided in areas other than the plurality of recesses, a plurality of cold cathode substrates mounted in the plurality of recesses, An insulating plate disposed between the plurality of cold cathode substrate ends and the external electrode, and a scanning electrode formed on each surface of the plurality of cold cathode substrates and connected to the external electrode, A light-emitting element for a display device, comprising: a plurality of cold cathodes connected to the scanning electrodes to emit electrons; and a gate electrode surrounding each of the cold cathodes and connected to the external electrode. 2. The light emitting device according to claim 1, wherein the insulating plate is a glass plate having a thickness of 5 mm or less, a width of 20 mm or less, and a length of 100 mm or less. 3. The light emitting device according to claim 1, wherein a conductive film is applied to the surface of the insulating plate on the fluorescent screen side, and the potential is set to a low potential. 4. The light emitting device according to claim 1, wherein a pattern of a conductive film corresponding to a land pattern formed on the rear panel is formed on a surface of the insulating plate on the rear panel side. 5. A vacuum vessel having a front panel and a back panel, a phosphor screen formed on an inner surface of the front panel, an exhaust port formed on the back panel, and a plurality of holes penetrating the back panel. An external electrode, a plurality of cold cathode substrates adhered to a region of the back panel where no exhaust port is formed, a scan electrode formed on a surface of the cold cathode substrate and connected to the external electrode, A plurality of cold cathodes formed to be connected to electrodes and emitting electrons; a gate electrode surrounding each cold cathode and connected to the external electrode; and the plurality of cold cathodes between the front panel and the back panel. A light emitting element for a display device, comprising: a mesh grid electrode provided so as to cover a substrate.