JP2002033081A - Light emitting element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the conventional problems such that it is difficult to shorten an arrangement pitch of light emitting elements when forming a large screen display unit and reduce cost, internal structure is complicated, and the reliability is reduced. SOLUTION: A cathode support electrode 4 which is an internal electrode is arranged on an insulation layer 13 covering a wiring layer 12, and the wiring layer 12 and the cathode support electrode 4 are mutually connected and fixed by a conducting layer 18 due to conducting paste coated by a dispenser through a through hole 14 opened in the insulation layer 13.

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 for forming a large-screen display used in a stadium or the like.

[0002]

2. Description of the Related Art FIG. 8 is a front view schematically showing a conventional light emitting device for forming a large-screen display, FIG. 9 is a cross-sectional view taken along line AA 'of FIG. 8, and FIG. It is a perspective view showing the important section of the light emitting element which removed a panel part. 8 and 9, reference numeral 1 denotes an evacuated vacuum envelope of the light emitting element, and 2 denotes R (red), G (green), and B regularly applied to the light emitting element in a matrix.
(Blue) phosphors. By arranging a large number of such light-emitting elements, a large-screen display capable of performing color display can be formed.

In FIG. 9, reference numeral 1a denotes a front panel serving as a display portion of the light emitting element, and 1b denotes a front panel 1a.
And a rear panel 1c as a substrate on which various electrodes are arranged. The rear panel 1c is a spacer formed by a cylindrical side plate that hermetically joins the front panel 1a and the rear panel 1b at predetermined intervals. The vacuum envelope 1 of the light emitting element is formed by the front panel 1a, the rear panel 1b, and the spacer 1c. The phosphors 2 are arranged in a matrix on the inner surface of the front panel 1a in the vacuum envelope 1, and each phosphor 2 has about 10
A high voltage of about kV is applied.

Further, in FIGS. 9 and 10, reference numeral 3 denotes a cathode formed in a linear shape and wired in parallel in the row or column direction, and reference numeral 4 denotes a cathode support electrode for wiring the cathode 3. It is. The cathodes 3 are prepared in a one-to-one correspondence with the phosphors 2, and the cathode support electrodes 4 are provided.
Are arranged in a matrix on the back panel 1b of the vacuum envelope 1. Reference numeral 5 denotes a scanning electrode as a first control electrode, which controls the flow of electrons emitted from the cathode 3 according to a scanning signal. Reference numeral 6 denotes a data electrode serving as a second control electrode, which controls the flow of electrons emitted from the cathode 3 according to display data. Reference numeral 7 denotes an aperture which is opened in the data electrode 6 corresponding to the phosphor 2 as an opening through which electrons emitted from the cathode 3 pass. In addition,
The scanning electrodes 5 are arranged on the inner surface of the back panel 1b in the row direction, and the data electrodes 6 are arranged between the phosphor 2 and the cathode 3 in the column direction. In FIG. 9, reference numeral 8 denotes an electrode pin for applying a signal from outside the light emitting element to the scanning electrode 5 and the like in the vacuum envelope 1. In FIG. 10, reference numeral 9 denotes exhaust of the vacuum envelope 1. It is an exhaust part for performing.

Next, the operation will be described. The basic principle of the operation of the conventional light-emitting device thus configured is that the thermoelectrons emitted from the cathode 3 are accelerated and the phosphor 2 serving as the anode is accelerated.
This causes the phosphor 2 to excite and emit light. That is, the thermoelectrons emitted from the cathode 3 are controlled as follows by the combination of the potentials of the scanning electrode 5 and the data electrode 6.

First, when the potentials of the scanning electrode 5 and the data electrode 6 are both positive with respect to the cathode 3, electrons are emitted from the cathode 3 since the vicinity of the cathode 3 has a positive potential. The electrons emitted from the cathode 3 pass through the aperture 7 of the data electrode 6 and reach the corresponding phosphor 2, causing the phosphor 2 to emit light. When the potential of the scan electrode 5 is positive and the data electrode 6 is negative, electrons emitted from the vicinity of the cathode 3 due to the negative potential of the data electrode 6 cannot reach the phosphor 2 and 2 does not emit light. Similarly, when the scanning electrode 5 is negative and the data electrode 6 is positive, the potential near the cathode 3 becomes negative due to the negative potential of the scanning electrode 5, and emission of thermoelectrons is suppressed. Here, the cathode 3 is wired close to the scanning electrode 5 side, and electrons emitted from the cathode 3 are strongly affected by the electric field of the scanning electrode 5. Further, when the scanning electrode 5 and the data electrode 6 are both negative, the potential near the cathode 3 becomes negative,
The emission of thermoelectrons is suppressed.

As a result, only the electrons emitted from the cathode 3 located at the intersection of the scanning electrode 5 and the data electrode 6 to which the positive potential is applied, are transmitted to the aperture 7 of the data electrode 6.
And only the corresponding phosphor 2 emits light. In this way, a desired display can be obtained by sequentially applying a scan signal to the scan electrode 5 and applying a predetermined data signal to the data electrode 6 in synchronization with the scan signal. Here, a direct heating type linear cathode is used as the cathode 3. This is heated by the flow of a predetermined current to emit thermoelectrons, and is characterized by low power consumption. Also, the cathodes 3 are wired one by one corresponding to each phosphor 2 so that the electrons emitted from the cathode 3 are uniformly irradiated on each phosphor 2.

When a large-screen display is formed by arranging a large number of such light-emitting elements, the electrode pins 8 of the light-emitting elements are arranged at the interface between the back panel 1b and the sealing portion of the spacer 1c as shown in FIG. Therefore, it is necessary to provide a predetermined space between the light emitting elements so that the electrode pins 8 of the adjacent light emitting elements do not contact each other. Accordingly, as shown in FIG. 8, a gap g1 corresponding to the width of the seam is formed between the phosphors 2 of the adjacent light emitting elements, and the seam of each light emitting element is made inconspicuous. It was necessary to provide an equivalent gap g2 between the respective phosphors 2.

In the above description, an example of a light emitting element having 4 × 4 pixels has been described. However, a large screen display formed by using this kind of light emitting element requires high resolution and low cost. Therefore, the number of pixels in the light emitting element is actually increased, and a light emitting element of m × n pixels is generally used. As the pixel density of the light emitting element increases, the gap g2 between the phosphors 2 in the light emitting element also needs to be reduced. However, as shown in FIG. 9, the gap between the back panel 1b and the sealing portion of the spacer 1c is required. Since the electrode pins 8 are drawn to the side from the interface, there is a limit in reducing the distance between the light emitting elements. When only the gap g2 between the phosphors 2 in the light emitting element is reduced, the phosphor of the adjacent light emitting element is reduced. The difference from the gap g1 between the two becomes large, and the seam becomes conspicuous.

In order to solve such a problem, a type in which the electrode pins 8 penetrate the back panel 1b as shown in FIGS. 11 and 12 has been proposed. In the figure, 1 is a vacuum envelope, 1a is a front panel, 1b is a back panel, 1c is a spacer, and 6 is a data electrode. Reference numeral 8 denotes an electrode pin that penetrates into the vacuum envelope 1 from the back panel 1b. The electrode pin 8 is made of a material having the same expansion coefficient as the back panel 1b. Reference numeral 10 denotes a ceramic plate on which the cathode, the scanning electrode and the like arranged on the rear panel 1b are arranged, and the illustration of the cathode and the scanning electrode is omitted here. Reference numeral 11 denotes a lead pin for connecting a scanning electrode or the like on the ceramic plate 10 to the electrode pin 8. The lead pin 11 is made of a material having the same expansion coefficient as that of the ceramic plate 10.

As described above, the electrode pins 8 are connected to the rear panel 1b.
Is introduced into the vacuum envelope 1 so that the light emitting elements can be arranged more densely. However,
When various control electrodes such as scanning electrodes and wiring are formed by screen printing or the like, the surface to be printed must be flat. However, since the electrode pins 8 pass through the inside of the vacuum envelope 1, they are placed on the rear panel 1 b. Is difficult to print. Therefore, control electrodes and wires that need to be formed by printing are formed on a flat plate such as the ceramic plate 10, and the control electrodes and wires on the ceramic plate 10 are connected to the electrode pins 8 via the lead pins 11. . In this case, the ceramic plate 10 is arranged so as to float by a predetermined dimension L from the back panel 1b.

References describing technologies related to such a conventional light emitting element include, for example, Japanese Patent Application Laid-Open No. Hei 2-295031 and Japanese Utility Model Application Laid-Open No. Sho 62-149156.

[0013]

Since the conventional light-emitting device is constructed as described above, in the light-emitting device shown in FIGS. 8 to 10, the electrodes of the light-emitting device seal the back panel 1b and the spacer 1c. Since a large number of light emitting elements are arranged side by side from the interface of the part, a predetermined interval is required between the light emitting elements so that the electrodes of the adjacent light emitting elements do not contact each other, and the joint of the light emitting elements is There is a problem that it is difficult to increase the pixel density so as to be inconspicuous. In the light-emitting elements shown in FIGS. 11 and 12, the light-emitting elements can be densely arranged, but the control electrodes and wirings that need to be formed by printing are separated from each other by a ceramic plate 10 in which only L is floated. Since the control electrodes and the like are connected to the electrode pins 8 via the lead pins 11, the internal structure of the light emitting element becomes complicated, which leads to an increase in cost and a decrease in reliability. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to shorten the arrangement pitch of the light emitting elements and to simplify the electrode structure, to achieve high resolution, low cost, and An object is to obtain a light-emitting element that can achieve high reliability.

[0015]

According to a first aspect of the present invention, there is provided a light emitting device, wherein a wiring layer is formed on an inner surface of a back panel by printing, the wiring layer is covered with an insulating layer, and a through hole formed in the insulating layer is provided. It has a conductive layer made of a conductive paste for electrically connecting the internal electrode provided on the insulating layer to the wiring layer through the hole.

In the light-emitting device according to the second aspect of the present invention, a wiring layer is formed on the inner surface of the back panel by printing and is covered with an insulating layer, and the wiring layer is electrically connected to the wiring layer via a through hole on the insulating layer. A lead layer which is electrically connected is provided, and an internal electrode is further provided on the lead layer via a conductive layer made of a conductive paste.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Reference Example 1. FIG. 1 is a sectional view showing a main part of a light emitting device according to a reference example 1, and FIG. 2 is a sectional view showing details thereof. In the drawing, 1a is a front panel, 1b is a rear panel provided opposite to the front panel 1a, and 1c is a cylindrical side plate that hermetically joins the front panel 1a and the rear panel 1b at a predetermined interval. A spacer 1 is a vacuum envelope of the light emitting element formed by the front panel 1a, the rear panel 1b, and the spacer 1c. Reference numeral 2 denotes three kinds of R, G, and B phosphors regularly applied to the inner surface of the front panel 1a in a matrix, and 3 is arranged in a matrix corresponding to each phosphor 2 in a one-to-one correspondence. The cathodes 4 formed in a linear shape and wired in parallel in the row or column direction are cathode support electrodes for wiring the cathodes 3. Reference numeral 5 denotes a scanning electrode as a first control electrode, which is arranged on the inner surface of the back panel 1b by printing in the row direction, and controls the flow of electrons emitted from the cathode 3 according to the scanning signal. Reference numeral 6 denotes a data electrode as a second control electrode, which is arranged in the column direction between the phosphor 2 and the cathode 3, and controls the flow of electrons emitted from the cathode 3 according to display data. Reference numeral 7 denotes an aperture which is opened in the data electrode 6 corresponding to the phosphor 2 as an opening through which electrons emitted from the cathode 3 pass. These are equivalent to those in the conventional light emitting device shown in FIGS. 8 to 10 or FIGS. 11 and 12.

Reference numeral 8 denotes an electrode pin for applying a signal from outside the light emitting element to the scanning electrode 5 and the like in the vacuum envelope 1, which penetrates the back panel 1b and
11 and FIG. 12 are the same as the electrode pins in the conventional light emitting element shown in FIGS. Is different. Reference numeral 12 denotes a wiring layer formed by printing on the inner surface of the back panel 1b. In FIG. 2, the scanning electrodes 5 belonging to the same row are connected to each other and are led to the vicinity of the electrode pins 8 to be connected. Are representatively shown. Reference numeral 13 denotes an insulating layer covering the wiring layer, and reference numeral 14 denotes a through hole formed in the insulating layer 13.
It serves to electrically connect the scanning electrode 5 formed thereon to the wiring layer 12. 15 is formed by applying a conductive paste with a dispenser between a portion of the wiring layer 12 not covered by the insulating layer 13 and a tip end surface of the electrode pin 8 exposed on the inner surface of the back panel 1b. The connection layer shown in FIG.
The scanning electrode 5 formed by printing on the inner surface plays a role of electrically connecting to the tip end surface of the electrode pin 8 via the wiring layer 12.

Next, the operation will be described. Reference Example 1
The light-emitting element operates electrically in the same manner as the conventional light-emitting element, and emits thermions emitted from the cathodes 3 provided corresponding to the phosphors 2 arranged in a matrix to the scanning electrode 5 sequentially. By controlling by applying a scanning signal and applying a predetermined data signal to the data electrode 6 in synchronization with the scanning signal, a high potential (about 10 kV) phosphor 2 is caused to selectively emit light by colliding with it. And the desired display has been obtained.

Here, the electrode pins 8 of the light emitting element in the reference example 1 are arranged so as to penetrate through the rear panel 1b such that the front end surfaces thereof are exposed on the same plane as the inner surface of the rear panel 1b. Therefore, the electrode pins 8 are connected to the back panel 1b.
The inner surface of the back panel 1b is kept flat regardless of where it is pulled out. Therefore, without separately preparing a flat plate such as the ceramic plate 10, various electrodes such as the scanning electrode 5 disposed on the back surface of the cathode 3 and the wiring layer 1 for their wiring are provided.
2 can be printed directly on the back panel 1b. In addition, by connecting the various electrodes and the wiring layer 12 to the electrode pins 8 via the connection layer 15 made of a conductive paste, the electrode pins 8 can be directly drawn out from anywhere on the back panel 1b. In addition, electrical connection is unnecessary,
For example, since there is an insulating layer 13 between the cathode support electrode 4 and the wiring layer 12, they are not short-circuited.

As described above, according to the light emitting device of the first embodiment, the electrode pins 8 can be directly pulled out from anywhere on the back panel 1b. As compared with the case where the electrode pins 8 are pulled out from the light emitting element, it is possible to arrange the light emitting elements more closely, and to realize a high resolution of a large screen display without making the joints stand out. Also,
Various electrodes and the wiring layer 12 can be directly printed on the back panel 1b, and a flat plate such as a ceramic plate is not required. Therefore, the structure of the light emitting element is simplified, and the manufacturing is facilitated. Low cost and high reliability can be achieved.

In the above description, the back panel 1
3B shows a case where the scanning electrode 5 is arranged on the scanning electrode 5b.
And the data electrode 6 may be arranged, and the same effect as in the above description can be obtained.

Reference Example 2 In the first embodiment, the case has been described where the tip end surfaces of the electrode pins 8 penetrating the back panel 1b are aligned on the same plane as the inner surface of the back panel 1b. Back panel 1
You may make it dent slightly lower than the inner surface of b. FIG. 3 is a sectional view showing details of the light emitting device according to the reference example 2. As shown in FIG. In the figure, 1b is a back panel,
Reference numeral 2 denotes a wiring layer printed on the inner surface of the back panel 1b. Reference numeral 8 denotes an electrode pin which penetrates the back panel 1b and whose tip end surface is exposed inside the back panel 1b, and whose tip end surface does not reach the same plane as the inner surface of the back panel 1b. Reference Example 1 where the same reference numeral is assigned to 2
Is different from the one. Reference numeral 15 denotes a conductive layer that fills a recess formed by the tip surface of the electrode pin 8 not reaching the same plane as the inner surface of the rear panel 1b, and electrically connects the wiring layer 12 and the electrode pin 8. This is a connection layer made of paste.

Here, as in Reference Example 1, back panel 1
b of the back surface panel 1
When the connection layer 15 is formed by applying a conductive paste with a dispenser when it is aligned on the same plane as the inner surface of b, it is difficult to make the thickness uniform. Therefore, it is not always possible to secure a sufficient amount of conductive paste in order to reliably obtain electrical continuity in the vicinity of the distal end surface of the electrode pin 8, which causes a problem that the reliability of connection is reduced. However, in Reference Example 2, since the tip end surfaces of the electrode pins 8 are slightly recessed below the inner surface of the back panel 1b, a sufficient amount of conductive paste is accumulated in the recesses formed therein, which is necessary for connection. A reliable conductive paste is secured, and the reliability of the electrical connection in the connection layer 15 is improved.

Reference Example 3 In the second embodiment, in order to secure a sufficient amount of the conductive paste to ensure the electrical conduction, the tip surface of the electrode pin 8 is slightly recessed from the inner surface of the back panel 1b to form a recess. Although the case has been described, a depression may be provided around the distal end portion of the electrode pin 8 of the rear panel 1b while keeping the distal end surface of the electrode pin 8 flush with the inner surface of the rear panel 1b.
FIG. 4 is a sectional view showing details of such a light emitting device according to the third embodiment. In the drawing, reference numeral 1b denotes a rear panel, 8 denotes an electrode pin which penetrates through the rear panel 1b and whose front end surface is exposed to be flush with the inner surface of the rear panel 1b and 12 denotes a rear panel 1b. This is a wiring layer printed on the inner surface. Reference numeral 16 denotes a recess provided in the rear panel 1b around the tip of the electrode pin 8, and reference numeral 15 fills a recess formed by the recess 16 to electrically connect the wiring layer 12 and the electrode pin 8. Connection layer made of conductive paste.

Here, when the concave portion is formed by making the tip end surface of the electrode pin 8 slightly lower than the inner surface of the back panel 1b as in Reference Example 2, the glass material forming the back panel 1b is Electrode pins 8 when shaping panel 1b
And the exposed area of the tip surface of the electrode pin 8 may decrease. As a result, it is not possible to secure a sufficient connection area for reliably obtaining electrical conduction, which may lead to a decrease in reliability of conduction. However, in the third embodiment, the distal end surfaces of the electrode pins 8 are aligned on the same plane as the inner surface of the rear panel 1b, and the recesses 16 are provided around the distal end portions of the electrode pins 8 on the rear panel 1b. Rear panel 1b on the tip surface of electrode pin 8
No longer flows into the glass material,
A sufficient amount of conductive paste is secured, and in the recess 16, the peripheral surface of the tip of the electrode pin 8 is also exposed and comes into contact with the conductive paste, so that the reliability of the electrical connection in the connection layer 15 is improved. It can be further improved. Here, the height of the tip of the electrode pin 8 does not need to be controlled so strictly.

Reference Example 4 Further, in Reference Examples 1 to 3,
Although the case where the connection layer 15 is formed by applying a conductive paste with a dispenser has been described, the connection layer 15 may be formed by screen-printing the conductive paste.

When the connection layer 15 is formed by applying a conductive paste with a dispenser as in Reference Examples 1 to 3, since it is difficult to make the thickness uniform, the conductivity of the formed connection layer 15 is reduced. The paste easily cracks,
This has led to a decrease in the reliability of the electrical connection. On the other hand, in Reference Example 4, the connection layer 15 is formed by screen-printing a conductive paste in order to make the thickness of the connection layer 15 uniform. The screen printing process for forming the connection layer 15 is the same as the process for forming the control electrodes such as the scanning electrodes 5 and the wiring layer 12, and the thickness and the position thereof can be accurately controlled. The reliability can be greatly improved and its manufacture is easy.

Reference Example 5 FIG. 5 is a sectional view showing details of a light emitting device according to Reference Example 5. In the drawing, reference numeral 1b denotes a back panel, and 8 denotes electrode pins which penetrate the back panel 1b and whose front end surfaces are aligned on the same plane as the inner surface of the back panel 1b and exposed. Reference numeral 12 denotes a wiring layer printed and formed on the inner surface of the back panel 1b, 13 denotes an insulating layer covering the wiring layer 12, and 14 denotes an insulating layer.
It is a through hole opened in Reference numeral 15 denotes a connection layer that electrically connects the wiring layer 12 and the electrode pins 8;
Reference numeral 7 denotes an upper wiring layer formed by printing on the insulating layer 13 and connected to the wiring layer 12 through the through hole 14. Reference Example 5 differs from Reference Examples 1 to 4 in that the connection layer 15 is also covered with the insulating layer 13.

Here, this kind of light emitting element is used in a manufacturing process when the front panel 1a, the back panel 1b, the spacer 1c, etc. are sealed to form the vacuum envelope 1.
Pass the heating step multiple times. When the connection layer 15 formed of the conductive paste is exposed to a high temperature in an oxygen atmosphere, the conductivity is reduced, and the reliability of the electrical connection may be reduced.
Therefore, in Reference Example 5, the connection layer 15 connecting the tip end surface of the electrode pin 8 and the wiring layer 12 is replaced with the insulating layer 13.
Covered by. As a result, the conductive paste forming the connection layer 15 is shielded from oxygen and is not exposed to an oxidizing atmosphere in the heating step, so that the conductivity does not decrease and good electrical characteristics are obtained. be able to.

Embodiment 1 FIG. 6 is a sectional view showing details of the light emitting device according to Embodiment 1 of the present invention. In the drawing, 1b is a back panel, 12 is a wiring layer printed and formed on the inner surface of the back panel 1b, 13 is an insulating layer covering the wiring layer 12, and 14 is a through hole formed in the insulating layer 13. It is. Reference numeral 4 denotes a cathode support electrode for supporting the cathode 3, and is shown here as an example of the cathode support electrode 4 and an internal electrode such as a data electrode 6 not formed by printing on the inner surface of the back panel 1b. Reference numeral 18 denotes a conductive layer that electrically connects the cathode support electrode 4 as an internal electrode to the wiring layer 12 through a through hole 14 formed in the insulating layer 13 and fixes the conductive layer. For example, it is formed of a conductive paste applied by a dispenser.

Here, when the number of pixels included in one light emitting element increases, the wiring of the electrodes becomes complicated, so that various wirings need to be multilayer wiring. For example, as shown in FIG. 5, a wiring layer 12 is printed on the inner surface of the back panel 1b, and control electrodes such as the scanning electrodes 5 and the upper wiring layer 1 are sandwiched between insulating layers 13.
7, and the control electrodes such as the scanning electrodes 5 are connected by the wiring layer 12 or the upper wiring layer 17, respectively, and the wiring layer 12 is connected to the control electrode or the upper wiring layer 17 by the through holes provided in the insulating layer 13. 14.

On the other hand, this kind of light emitting element is
b. In addition to the control electrodes such as the scan electrodes 5 printed on the substrate b, wiring of internal electrodes such as the support electrode 4 for connecting the cathode 3 and the data electrode 6 disposed between the cathode 3 and the phosphor 2. And fixation is required. Here, on the surface of the back panel 1b, there are a control electrode such as the scanning electrode 5 printed as described above, the wiring layer 12, the upper wiring layer 17, and the like. A short circuit with the wiring layer is a concern. Therefore, the first embodiment
In the above, the cathode support electrode 4 as an internal electrode is disposed on the insulating layer 13 covering the wiring layer 12, and the wiring layer 12 and the internal electrode are connected to each other through a through hole 14 formed in the insulating layer 13. (Cathode support electrode 4) and conductive layer 1 of a conductive paste applied by a dispenser.
Connection is made at step 8 and the connection is fixed. as a result,
The internal electrodes such as the cathode support electrode 4 are arranged and fixed on the insulating layer 13 and are electrically connected to a predetermined wiring layer 12, and are electrically short-circuited with other control electrodes (such as the scanning electrode 5) and the wiring layer. Is eliminated.

Embodiment 2 FIG. 7 is a sectional view showing details of a light emitting device according to Embodiment 2 of the present invention. In the drawing, 1b is a back panel, 12 is a wiring layer printed and formed on the inner surface of the back panel 1b, 13 is an insulating layer covering the wiring layer 12, and 14 is a through hole formed in the insulating layer 13. It is. Reference numeral 19 denotes a lead layer formed by printing on the insulating layer 13 and electrically connected to the wiring layer 12 through a through hole 14 formed in the insulating layer 13. Reference numeral 4 denotes a cathode support electrode which supports the cathode 3, which is shown as an example of an internal electrode. Reference numeral 18 denotes a cathode support electrode formed of, for example, a conductive paste applied by a dispenser. 1
9 is a conductive layer that is electrically connected to and fixed mechanically.

Here, the connection between the internal electrode such as the cathode support electrode 4 and the printed wiring layer 12 is made as follows.
Unlike the connection between the wiring layer 12 and the upper wiring layer 17, both of which are formed by printing, or the connection between the wiring layer 12 and a control electrode such as the scanning electrode 5, the following problem occurs. That is, the internal electrode (cathode support electrode 4) is connected to the conductive layer 1 through the through hole 14 provided in a part of the insulating layer 13.
8 when directly connected to the wiring layer 12, the through hole 1
In the portion 4, the conductive paste accumulates in excess by the thickness of the insulating layer 13, and the thickness of the conductive layer 18 becomes uneven. When the thickness of the conductive layer 18 becomes non-uniform as described above, cracks may be generated in the conductive paste of the conductive layer 18 due to vibration, and thus the reliability of the electrical connection is reduced. Therefore, in the second embodiment,
A lead layer 19 is formed on the insulating layer 13 by printing and connected to the wiring layer 12 through a through hole 14 provided in the insulating layer 13. The internal electrode (cathode support electrode 4) is connected and fixed to the non-existing portion by using a conductive layer 18 of a conductive paste applied by a dispenser. As a result, the internal electrodes such as the cathode support electrode 4 and the lead layer 19
Since the thickness of the connection surface is uniform and a sufficient connection area is secured, the reliability of the electrical connection is improved.

[0036]

As described above, according to the first aspect of the present invention, the wiring layer formed by printing on the inner surface of the back panel is covered with the insulating layer, and the wiring layer is formed through the through hole formed in the insulating layer. Since the internal electrodes were configured to be electrically connected to the wiring layer using a conductive layer made of conductive paste,
The internal electrodes, such as the cathode support electrode, are arranged on the insulating layer, eliminating electrical shorts with the printed control electrodes and wiring layers, thus simplifying the structure of the light emitting element and providing a high resolution light emitting element. Is obtained, and the cost of the light emitting element can be further reduced.

According to the second aspect of the present invention, the wiring layer formed by printing on the inner surface of the back panel is covered with the insulating layer, and the insulating layer is electrically connected to the wiring layer via a through hole. A lead layer is provided, and the internal electrodes are electrically connected to the lead layer by a conductive layer made of a conductive paste. Therefore, the thickness of the conductive layer connecting the internal electrode such as a cathode support electrode to the lead layer is set. Is uniformed and a sufficient connection area is secured, so that there is an effect that the reliability of the electrical connection of the internal electrodes can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a light emitting device according to Reference Example 1.

FIG. 2 is an enlarged sectional view showing details of FIG. 1 in detail.

FIG. 3 is a cross-sectional view illustrating details of a light emitting device according to Reference Example 2.

FIG. 4 is a cross-sectional view illustrating details of a light emitting device according to Reference Example 3.

FIG. 5 is a cross-sectional view illustrating details of a light emitting device according to Reference Example 5.

FIG. 6 is a sectional view showing details of the light emitting device according to the first embodiment of the present invention.

FIG. 7 is a sectional view showing details of a light emitting device according to a second embodiment of the present invention.

FIG. 8 is a front view showing an example of a conventional light emitting device.

FIG. 9 is a sectional view taken along line A-A ′ of FIG. 8;

FIG. 10 is a perspective view showing a main part of the light emitting device from which a front panel portion is removed.

FIG. 11 is a bottom view showing another example of the conventional light emitting device.

FIG. 12 is a cross-sectional view illustrating a main part of the light-emitting element.

[Explanation of symbols]

1 vacuum envelope, 1a front panel, 1b rear panel, 1c spacer, 2 phosphors, 3 cathodes, 5 scanning electrodes (first control electrode), 6 data electrodes (second control electrode), 8 electrode pins, 12 wiring layer, 13 insulating layer, 14 through hole, 15 connection layer, 16 hollow, 18 conductive layer, 19 lead layer.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) H01J 31/15 H01J 31/15 C (72) Inventor Yoji Yamaguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Kosaburo Shibayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Norihisa Hasegawa 700 Wada, Uenocho, Ise-shi, Mie Ise Electronics Within Industrial Co., Ltd. AA43 AA44 BA03 BA32 CA19 EA04 EA07 EC03

Claims (2)

[Claims] 1. A front panel in which a plurality of phosphors are arranged in a matrix on an inner surface thereof, a cathode provided corresponding to each of the phosphors, and a cathode connected in a row direction and connected from the cathode. First to control emitted thermoelectrons
A control electrode, a second control electrode commonly connected in the column direction to control thermionic electrons emitted from the cathode, and the first control electrode and A back panel in which at least one of the second control electrodes and a wiring layer covered with an insulating layer are formed by printing; and a vacuum envelope formed by airtightly joining the front panel and the back panel. And a conductive layer made of a conductive paste for electrically connecting an internal electrode provided on the insulating layer to the wiring layer through a through hole formed in the insulating layer. 2. A front panel in which a plurality of phosphors are arranged in a matrix on an inner surface thereof, a cathode provided corresponding to each of the phosphors, and a cathode connected in common in a row direction to the cathode. First to control emitted thermoelectrons
A control electrode, a second control electrode commonly connected in the column direction to control thermionic electrons emitted from the cathode, and the first control electrode and A back panel in which at least one of the second control electrodes and a wiring layer covered with an insulating layer are formed by printing; and a vacuum envelope formed by airtightly joining the front panel and the back panel. And a lead layer disposed on the insulating layer and electrically connected to the wiring layer via a through hole formed in the insulating layer, and a portion other than the through hole on the lead layer. And an internal electrode provided through a conductive layer made of a conductive paste.