JP2003100209A - Manufacturing method of plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of plasma display panel capable of suppressing a difference in resistances of electrodes at a central and end parts of a large area screen, where the distribution of luminance in the electrodes can be kept uniform. SOLUTION: The method is an improved manufacturing method of PDP which uses the steps of injecting electrode material ink on a substrate with an ink jet. The electrode material ink contains at least two kinds, a first and second electrode material inks. The first electrode material ink contains a colloid consisting of either one or both of a metal Ru or Ru-based oxides. The second electrode material ink contains a colloid containing of either one as both of a metal or metal oxides. The metal is one kind selected from among Au, Ag, Pd, Pt, Ir, Cu, Rh and Os or alloys or mixture of at least two kinds of metals. The method comprises the steps of plotting a pattern by injecting the first electrode material ink on a substrate, and then injecting the second electrode material ink to form electrodes by plotting a pattern on the first material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel used for information display terminals, flat-screen televisions and the like. More specifically, the present invention relates to a method for manufacturing a plasma display panel suitable for a large area panel.

[0002]

2. Description of the Related Art Plasma display panels (Plasma D
The isplay Panel (PDP) can display at a higher speed than a liquid crystal display, etc., and can be thinner and lighter than a CRT-type direct-view display device, etc., so that a large-screen wall-mounted TV or the like can be realized. Is expected as a powerful means of. Further, since it can be easily upsized, it has penetrated into the fields of office automation equipment, public relations display devices, etc., and the progress in the field of high-definition television is highly expected. With the expansion of such applications, attention has been paid to a color PDP having a large number of fine display cells.

A PDP is a display device that excites and emits a fluorescent substance by ultraviolet rays generated by gas discharge to perform a display operation. This PDP has an AC type and a DC type depending on the type of discharge.
The AC type is superior to the DC type in terms of brightness, luminous efficiency, and life. In particular, among the AC types, the reflective AC surface discharge type is superior in brightness and luminous efficiency,
Here, a reflective AC surface discharge type will be described as an example.

FIG. 2 is a sectional view of a reflective AC surface discharge color PDP. As shown in FIG. 2, this panel is one in which two substrates 11 and 12 are separately prepared and then stacked in a sandwich. The transparent electrode 1 is formed on the front substrate 11 formed of a transparent glass plate on the display surface side.
3 is formed. A plurality of transparent electrodes 13 are formed in a strip shape in a direction parallel to the paper surface, and one pair is formed for each discharge cell. A display discharge can be obtained by applying a pulsed AC voltage of several tens of kHz to several hundreds of kHz between the adjacent transparent electrodes 13 to generate a surface discharge. In addition, reference numeral 18 in FIG. 2 denotes a partition wall which forms the discharge space 17 between the front substrate 11 and the rear substrate 12 which are superposed on each other.
Reference numeral 19 is a phosphor, 21 is a color filter, 22 is a protective layer, and 23 is an insulating layer.

A bus electrode 14 is laminated on the transparent electrode 13. The width of the bus electrode 14 is narrower than the width of the transparent electrode 13, and is formed along the end portion of the transparent electrode 13. Usually, this transparent electrode 13 is made of tin oxide (SnO ₂ ) or I
TO (Indium Tin Oxide) or the like is used. Transparent electrode 1
The bus electrode 14 formed to reduce the resistance of No. 3 is formed of a thick metal film of silver or the like, an aluminum thin film, or a chromium / copper / chrome multilayer thin film. The thick film paste used for film formation is often mixed with some black pigment to improve the contrast. The line width of the bus electrode 14 is preferably as long as the resistance value is sufficiently low, because the thinner the panel, the higher the panel brightness.

On the other hand, a data electrode 16 for writing display data is formed on the rear substrate 12. The data electrode 16 extends in the direction perpendicular to the paper surface, and one data electrode 16 is formed for each discharge cell. That is, the data electrodes 16 are the transparent electrodes 13 and the bus electrodes 1 formed on the front substrate 11.
It is orthogonal to 4.

Here, a method of forming the bus electrodes and the data electrodes will be briefly described. As a forming method, a screen printing method, a thick film etching method, a photosensitive paste method, or a dispenser method is used. The screen printing method is a method of printing on a substrate using a screen on which an electrode pattern is formed. The thick film etching method is a method in which a solid pattern of a thick film of silver is formed on the front surface of a substrate by screen printing, and after baking, etching is performed with nitric acid or the like. The photosensitive paste method is a method in which a silver paste is mixed with a photosensitive agent to form a solid pattern on a substrate, which is then exposed and developed and baked. The dispenser method is a method in which an electrode material paste is extruded from the tip of a nozzle and directly drawn on a substrate.

However, the conventional forming method has the following problems. The screen printing method is a method of directly printing the material of the electrode pattern on the substrate, but for a high-definition color PDP having a large area of a diagonal of 1 meter or more and a trio pitch of 1 mm or less, the pattern accuracy is high. Is insufficient, and the line width of the bus electrode can be stably formed only up to about 100 μm. If the line width is less than 100 μm, disconnection easily occurs and the process becomes unstable.
Therefore, it was extremely difficult to use it in an actual product. In addition, the thick film etching method can sufficiently support pattern accuracy, but it requires a resist forming process,
There is a problem that the glass substrate is colored yellow by once forming a solid film on the glass substrate and baking it, thereby deteriorating the display quality of the display, especially the color purity. There is also a drawback that most of the material is discarded by etching.

The photosensitive paste method is sufficiently compatible with pattern accuracy, but since the photosensitizer is mixed with the paste containing silver particles that do not transmit light, the photosensitizer in the shadow of the silver particles is mixed. Had a drawback that it was difficult to be sufficiently exposed to light and the adhesiveness to the substrate deteriorated. Therefore, in the case of a fine pattern of 100 μm or less, there is a problem that the process stability, that is, the yield is deteriorated due to poor adhesion. Further, for the same reason, there is a drawback that a large amount of black pigment cannot be mixed. Further, like the thick film etching method, there is also a drawback that most of the material is discarded. Further, the dispenser method requires 30 to 10 which is required for the bus electrode of the color PDP.
It is very difficult to draw with a thin line width of 0 μm.
Further, since the distance between the substrate and the nozzle needs to be 100 to 500 μm, there is a problem that when the substrate has a warp or undulation as in a large area substrate, the substrate and the nozzle are in contact with each other and drawing cannot be performed.

As a method for solving the above problems, a method of ejecting an electrode material ink by an ink jet to form an electrode of a PDP has been proposed (Japanese Patent Laid-Open No. 2000-26).
8716). By the method using this inkjet,
It is possible to minimize the waste of electrode material and to accurately form an electrode having a line width of 100 μm or less in a short process.

[0011]

However, when a screen is formed in a large area, the PDP has different distances from the control device between the electrodes forming the screen and the electrodes located at the center and the control device. An electrode with a short distance has a small voltage drop, and an electrode with a long distance has a large voltage drop. Therefore, there is a problem that the luminance distribution appears even when the electrodes of the PDP are formed by the method disclosed in the above publication.

An object of the present invention is to provide a method for manufacturing a PDP which can suppress the change in the resistance value of the electrode at the central portion and the end portion of a large area screen. Another object of the present invention is to provide a PDP capable of uniforming the brightness distribution in the formed electrode.
It is to provide a manufacturing method of.

[0013]

The invention according to claim 1 is
As shown in FIG. 1, the electrode material ink 26 is ejected onto the glass substrate 11 by an ink jet to form the electrode 1 for PDP.
4 is an improvement in the manufacturing method of the PDP forming No. 4. The characteristic constitution is that the electrode material ink includes at least two kinds of ink, that is, a first electrode material ink and a second electrode material ink, and the first electrode material ink is a colloid composed of either or both of metal ruthenium and ruthenium oxide. And the second electrode material ink contains a colloid consisting of one or both of metal and metal oxide, and the metal used for the second electrode material ink is Au, Ag, Pd, Pt, Ir, Cu, Rh.
And one or more alloys or mixed systems selected from Os, the first electrode material ink is ejected to be drawn on the glass substrate 11, and the first electrode material ink is further drawn thereon. The electrode 14 is formed by ejecting the second electrode material ink for drawing.

In the invention according to claim 2, as shown in FIG. 1, the electrode material ink 26 is ejected onto the glass substrate 11 by an ink jet to form the electrode 14 for PDP.
This is an improvement in the DP manufacturing method. The characteristic constitution is that the electrode material ink includes at least two kinds of ink, that is, a first electrode material ink and a second electrode material ink, and the first electrode material ink is a colloid composed of either or both of metal ruthenium and ruthenium oxide. And the second electrode material ink contains a colloid composed of either or both of a metal and a metal oxide, and the metal used for the second electrode material ink is A
One or more alloys or mixed systems selected from u, Ag, Pd, Pt, Ir, Cu, Rh, and Os, wherein the first electrode material ink and the second electrode material ink are simultaneously and at the same location. Then, the electrode 14 is formed by discharging.

In the invention according to claim 1 or 2, the electrodes are formed by combining the ink of the first electrode material and the ink of the second electrode material ejected by the ink jet, so that the resistance value of each electrode is made one by one. Since it is possible to change the book, it is possible to suppress the change in the resistance value of the electrode at the central portion and the end portion of the large area screen, and to eliminate and uniform the distribution of the luminance of the electrode.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material). Ink) is 5 to 10: 5 to 0.1. In the invention according to claim 3, the discharge amount weight ratio of the second electrode material ink to the first electrode material ink is 5 to 5.
It is 10: 5 to 0.1. The discharge amount weight ratio of the second electrode material ink to the first electrode material ink varies depending on the length of the electrode formed, but a preferable discharge amount ratio is 7
-10: 3 to 0.1.

The invention according to claim 4 relates to claims 1 to 3.
The invention according to any one of the aspects, is a manufacturing method in which the electrode is the bus electrode 14 or the data electrode 16.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to the drawings. The method for forming the electrode for PDP in the present invention is to form the electrode material ink by ejecting the electrode material ink onto the glass substrate by inkjet.

The ink jet is an apparatus for ejecting and drawing a minute ink droplet, and there are various methods depending on the principle of ejecting the ink. For example, a piezo-type inkjet that uses a piezoelectric material called a piezo applies a voltage to the piezo attached to the head to expand and contract the piezo.
The electrode material ink in the head is ejected from the nozzle.
A predetermined electrode pattern can be drawn by inputting a signal corresponding to the electrode pattern to the piezo and moving the head or the substrate. The head is connected to the electrode material ink tank, and the electrode material ink is replenished by the ejected amount.

A characteristic constitution of the present invention is that the electrode material ink contains at least two kinds of ink, that is, a first electrode material ink and a second electrode material ink, and the first electrode material ink is either metal ruthenium or ruthenium oxide. Alternatively, the second electrode material ink contains a colloid made of both, and the second electrode material ink contains a colloid made of one or both of a metal and a metal oxide, and the metal used for the second electrode material ink is Au, Ag, P.
d, Pt, Ir, Cu, Rh, and Os, which are one or more alloys or mixed systems selected from the first electrode material ink and ejected to draw on the glass substrate. The second electrode material ink is further ejected on the ink drawn to form an electrode by drawing.

As the electrode material ink, at least two kinds of ink, that is, a first electrode material ink and a second electrode material ink are used. Although there are two types in this embodiment, three types are used depending on the application.
You may use four or more types of electrode material ink. The first electrode material ink contains a colloid composed of either or both of metal ruthenium and a ruthenium oxide.
The colloid has a particle size of about 1 nm to 1 μm. The second electrode material ink contains a colloid composed of one or both of metal and metal oxide, and the metal used for the second electrode material ink is selected from Au, Ag, Pd, Pt, Ir, Cu, Rh and Os. One or more alloys or mixed systems.

As shown in FIG. 1, when the bus electrode 14 is laminated on the transparent electrode 13 formed on the front substrate 11,
When the electrode material ink 26 is ejected from the inkjet head 24, the inkjet draws the pattern of the electrode 14 by moving the head 24 or the substrate 11.

When drawing this electrode pattern, first,
The first electrode material ink is ejected to draw a predetermined electrode pattern, and then the second electrode material ink is ejected to draw on the electrode pattern drawn with the first electrode material ink. As a result, the change in the resistance value of the electrode at the central portion and the end portion of the screen due to the different distance from the controller, which has been a problem of the electrode formed only by the first electrode material ink, and the applied voltage It is possible to solve the destabilization and the nonuniform brightness distribution. The ejection amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) is 5 to 10: 5 to 0.1.

Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in the following points. That is, the first electrode material ink and the second electrode material ink are ejected at the same time and at the same location to form electrodes. The configuration other than the above is the same as that of the first embodiment.
Compared to the first embodiment, in the second embodiment,
Since a plurality of electrode material inks are ejected at the same time and at the same place, the electrode pattern can be evenly laminated on the transparent electrode on the glass substrate.

[0025]

EXAMPLES Next, examples of the present invention will be described in detail together with comparative examples. Example 1 A first electrode material ink containing Ru colloid and a second electrode material ink containing Au colloid were prepared. First, an ink tank was filled with each of the first electrode material ink and the second electrode material ink, and the first electrode material ink was ejected to draw an electrode pattern having a length of 100 cm on a glass substrate. Next, the discharge electrode weight ratio of the second electrode material ink to the first electrode material ink is 9 (first electrode material ink: second electrode material ink).
An electrode pattern was formed by further discharging on the electrode pattern drawn by the first electrode material ink by discharging so as to be 0: 1.0.

<Embodiment 2> The length of the electrode pattern is set to 110.
cm and the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) was 8.5: 1.5, and the same as Example 1. Then, an electrode pattern was formed on the glass substrate. <Example 3> The length of the electrode pattern is 120 cm, and the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) is 8.0: 2. An electrode pattern was formed on the glass substrate in the same manner as in Example 1 except that 0 was set.

<Embodiment 4> The length of the electrode pattern is set to 130.
cm, and the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) was 7.5: 2.5 except that the first electrode material ink was 7.5: 2.5. Then, an electrode pattern was formed on the glass substrate. <Embodiment 5> The length of the electrode pattern is 140 cm, and the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) is 7.0: 3. An electrode pattern was formed on the glass substrate in the same manner as in Example 1 except that 0 was set. <Example 6> The length of the electrode pattern was 150 cm, and the discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) was 6.5: 3. An electrode pattern was formed on a glass substrate in the same manner as in Example 1 except that No. 5 was used.

Comparative Example 1 An electrode pattern was formed on a glass substrate in the same manner as in Example 1 except that only the first electrode material ink was ejected to form the electrode pattern.

<Comparative Example 2> The length of the electrode pattern is set to 110.
An electrode pattern was formed on a glass substrate in the same manner as in Comparative Example 1 except that the electrode pattern was cm. <Comparative Example 3> An electrode pattern was formed on a glass substrate in the same manner as in Comparative Example 1 except that the length of the electrode pattern was 120 cm.

<Comparative Example 4> The length of the electrode pattern was set to 130.
An electrode pattern was formed on a glass substrate in the same manner as in Comparative Example 1 except that the electrode pattern was cm. <Comparative Example 5> An electrode pattern was formed on a glass substrate in the same manner as in Comparative Example 1 except that the length of the electrode pattern was 140 cm. <Comparative Example 6> An electrode pattern was formed on a glass substrate in the same manner as in Comparative Example 1 except that the length of the electrode pattern was 150 cm.

<Comparative Test and Evaluation> 400 glass substrates having the electrode patterns of Examples 1 to 6 and Comparative Examples 1 to 6 were used.
The electrode was formed by baking at 30 ° C. for 30 minutes, and the resistance value of the formed electrode was measured. Each is shown in Table 1.

[0032]

[Table 1]

As is clear from Table 1, in the electrodes of Comparative Examples 1 to 6, there was a clear difference in the resistance value depending on the length.
On the other hand, in the electrodes of Examples 1 to 6, the resistance value depending on the length was almost uniform.

[0034]

As described above, according to the present invention, the method for manufacturing a plasma display panel is improved in which the electrode material ink is ejected onto the glass substrate by the ink jet to form the electrodes for the plasma display panel.
The characteristic configuration is that the electrode material ink is at least the first.
Including two types of electrode material ink and second electrode material ink,
The first electrode material ink contains a colloid composed of either one or both of metal ruthenium or a ruthenium oxide, and the second electrode material ink contains a colloid composed of either one or both of a metal and a metal oxide. The metal used for the electrode material ink is Au, Ag, Pd, Pt, Ir,
One or more alloys or mixed systems selected from Cu, Rh, and Os, which are drawn on the glass substrate by ejecting the first electrode material ink and then drawn by the first electrode material ink In addition, the electrode is formed by further ejecting the second electrode material ink and drawing. As a result, an electrode having a fine line width can be formed, a change in the resistance value of the electrode at the central portion and the end portion of the large area PDP formed by this electrode can be suppressed, and further, the luminance distribution in the formed electrode can be reduced. It can be made uniform.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method for manufacturing a plasma display panel of the present invention.

FIG. 2 is a cross-sectional configuration diagram of main parts of a plasma display panel.

[Explanation of symbols]

11 Front board 12 Rear substrate 13 Transparent electrode 14 bus electrodes 16 data electrodes 17 discharge space 18 Partitions (barriers, ribs) 19 phosphor 21 color filter 22 Protective layer 23 Insulation layer 24 inkjet heads 26 Electrode material ink

Continued front page    F-term (reference) 5C027 AA02                 5C040 FA01 GB03 GB14 GC18 GC19                       MA03                 5C094 AA06 BA31 DA14 EA04 EA05                 5G435 AA02 BB06 EE33 HH12 KK05                       KK10

Claims (4)

[Claims] 1. An electrode material ink (2
In the method for manufacturing a plasma display panel, the electrode material ink is at least a first electrode material ink and a second electrode material ink, by discharging 6) onto a glass substrate (11) to form electrodes (14) for the plasma display panel. The first electrode material ink contains a colloid composed of either or both of metal ruthenium and ruthenium oxide, and the second electrode material ink contains one or both of metal and metal oxide. And a metal used for the second electrode material ink is Au, Ag, Pd, or P.
1 or 2 selected from t, Ir, Cu, Rh and Os
It is an alloy or a mixed system of one or more kinds, and the first electrode material ink is ejected to draw on the glass substrate (11), and the second electrode material ink is further drawn on the drawn on the glass substrate (11). A method for manufacturing a plasma display panel, which comprises forming electrodes (14) by discharging and drawing. 2. An electrode material ink (2
In the method for manufacturing a plasma display panel, the electrode material ink is at least a first electrode material ink and a second electrode material ink, by discharging 6) onto a glass substrate (11) to form electrodes (14) for the plasma display panel. The first electrode material ink contains a colloid composed of either or both of metal ruthenium and ruthenium oxide, and the second electrode material ink contains one or both of metal and metal oxide. And a metal used for the second electrode material ink is Au, Ag, Pd, or P.
1 or 2 selected from t, Ir, Cu, Rh and Os
Manufacture of a plasma display panel, which is an alloy or a mixed system of one or more kinds, wherein the first electrode material ink and the second electrode material ink are ejected at the same time and at the same location to form the electrode (14). Method. 3. The discharge amount weight ratio of the second electrode material ink to the first electrode material ink (first electrode material ink: second electrode material ink) is 5 to 10: 5 to 0.1.
Or the manufacturing method according to 2. 4. The electrode is a bus electrode (14) or a data electrode (16)
The manufacturing method according to any one of claims 1 to 3.