JP2003208852A - Display device and method of manufacturing the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode of a plasma display panel capable of preventing a glass substrate from being colored yellowish even if a silver material is used, increasing a contrast and a brightness, and a method of manufacturing the electrode. <P>SOLUTION: To form the electrode, a transparent electrode 100, a coloring suppressing layer 103, and a silver conductive layer 101 are stacked on a front substrate glass 10 formed by a float method in that order. A bus electrode is formed under the transparent electrode 100 by using a material including a silver with a low electric resistance, and the coloring suppressing layer 103 is formed of a material including an element having an ionization tendency larger than the silver is formed between the silver conductive layer 101 and the transparent electrode 100. Since the coloring suppressing layer 103 including the element having the ionization tendency larger than the silver reduces the silver ion into metal silver, the coloring yellowish produced by the diffusion of the silver ion on the glass substrate can be suppressed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-luminous display device having a plurality of pixels and emitting light in units of pixels, and more particularly to a flat panel display device such as a plasma display panel.

[0002]

2. Description of the Related Art In recent years, as a large-sized flat panel display, the development of a plasma display panel (hereinafter referred to as PDP) in which a phosphor is excited and emitted by ultraviolet rays generated by rare gas discharge to be used for image / video display has been accelerated. There is an increasing social demand as a display device of an information processing apparatus represented by a computer or the like, or as a large-sized television receiver or a public display monitor.

The PDP has an AC drive system and a DC drive system. Here, the structure of a general AC drive system PDP (hereinafter, the AC drive system PDP is referred to as AC-PDP) is shown in FIG. . Although there are various types of AC-PDPs, FIG. 1A shows a part of the structure of a type called a surface discharge type as a three-dimensional perspective view. In a PDP, row electrodes and column electrodes are orthogonally arranged on a glass front substrate 1 and a rear substrate 2, respectively, and a discharge space 3 is formed by an intersection of both row and column electrodes which become pixels, and a partition wall between both substrates. Has a structure to form.

In the surface discharge type AC-PDP, as shown in FIG. 1 (a), the front substrate 1 has a sustain electrode 13 for inputting a sustain signal of discharge on the front substrate glass 10 and a sequential display. A plurality of scan electrodes 14 for inputting the scan signal of the above are formed in parallel to form a row electrode, and a dielectric layer 11 for forming wall charges due to discharge on these row electrodes. A protective film 12 made of MgO is formed on the top. Further, a black matrix 15 serving as a light-shielding layer may be formed between adjacent pairs of sustain electrodes / scanning electrodes as needed in order to enhance the contrast of the display surface.

On the other hand, the rear substrate 2 includes a rear glass substrate 16
A plurality of address electrodes 19 serving as column electrodes for inputting a plurality of display data signals are formed on the sustain electrodes 13 and the scan electrodes 14 forming the row electrodes of the front substrate 1 so as to intersect therewith. A base dielectric layer 1 for forming wall charges due to discharge on the address electrodes 19 as well.
7, and the partition wall 1 on top of it in parallel with the address electrode 19.
8 is formed, and a phosphor layer 20 that emits red, blue, and green is provided on the partition wall 18.

Then, the front substrate 1 and the rear substrate 2 are bonded together to form a discharge space 3, and a rare gas containing Ne as a main component is sealed therein to produce a PDP. By applying a voltage pulse of a predetermined signal to the sustain electrode 13, the scan electrode 14, and the address electrode 19, the enclosed rare gas is excited and emits ultraviolet rays, and the ultraviolet rays cause the phosphor layer 20 provided on the partition walls 18. Can excite and emit visible light to display information.

Further, as the electrode material, Ag, Al, Cu
A material containing a metal such as is used and is mixed with various organic materials to be used as a paste or a transfer sheet formed on a protective film. A low softening point glass or the like is used as the dielectric material or the partition wall material, and is provided in the form of a paste or a sheet like the electrode.

As a method of manufacturing the respective constituent members, the electrodes and the black matrix are formed by a photolithography method or a thin film forming method using a photosensitive material.
The phosphor layer and the dielectric layer are formed by screen printing or a coating method using various coaters. For the formation of electrodes and dielectrics, a method in which the material used is processed into a sheet shape and attached is also used. After formation, firing is performed at a predetermined temperature to fix various components to the substrate to complete the process.

FIG. 1B shows a detailed structure of a sustain electrode 13 and a scan electrode 14 forming a row electrode formed on the front substrate glass 10 of FIG. The sustain electrode 13 and the scan electrode 14 are the transparent electrode 100 and the silver conductive layer 1 serving as a bus electrode formed on the transparent electrode 100.
It is composed of 01. The reason why silver is used as the electrode material of the bus electrode is that the electrical resistance is low, and after the pattern formation, atmospheric baking is possible in the baking process for fixing to the substrate. Copper and aluminum can obtain low electric resistance values like silver, but they are used because the resistance value increases from the original electric resistance due to oxidation when firing in the air. Rarely. Further, in order to increase the contrast of the display surface, as shown in FIG. 1C, the black electrode 102 may be provided below the silver conductive layer 101 to form the sustain electrode 13 and the scan electrode 14.

By the way, glass materials for substrates such as PDP glass substrates which require a large area are generally manufactured by a float method in which molten glass is cast on molten tin (Sn) to be molded. This is because the float method has a feature that a glass material having a flat surface can be easily mass-produced.

Then, as schematically shown in FIG. 8, a black layer 102 containing a black pigment on a front substrate glass 10 formed by a float method and a silver conductive layer 101 to be a bus electrode.
It is known that when a laminated layer is formed, the colored layer 105 is formed on the surface of the front substrate glass 10 immediately below the silver conductive layer 101 and turns yellow during the heat treatment process during the process regardless of the presence or absence of the transparent electrode. (Example: JP-A-10-255669
Issue).

[0012]

The phenomenon in which the float glass is colored or colored by the silver electrode is due to the redox reaction of the reducing tin (Sn) present on the float glass with silver ions. Generated by wavelength 3
It is considered to be caused by the light absorption in the vicinity of 00 nm to 400 nm.

That is, since the float glass is exposed to a hydrogen atmosphere during the forming process, a reducing layer having a thickness of several microns is formed on the glass surface, and tin ions (Sn ⁺⁺ ) derived from molten tin (Sn) are formed in this layer. ) Exists. By heat treatment when the glass substrate through the transparent electrode to form a bus electrode of a silver (Ag), silver (Ag) is changed to a silver ion (Ag ^+), the silver ions (Ag ⁺⁾ diffused transparent electrode Then, ion exchange occurs between the glass surface and the alkali metal ions contained in the glass, and the silver ion (A
g ⁺ ) invades. The invading silver ion (Ag ⁺ ) is reduced by the tin ion (Sn ⁺⁺ ) existing in the reducing layer to generate a colloid of metallic silver (Ag). The substrate glass is colored or develops yellow due to this silver (Ag) colloid. The float method is the best method for manufacturing a glass substrate used for a large-sized display device such as a PDP, but since it is formed on molten tin (Sn), tin (S) on glass is used.
Adhesion of n) cannot be avoided.

When the glass substrate is colored or colored yellow in this way, it is a fatal defect for a display device such as a PDP. This is because the chromaticity of light emission changes due to the coloring of the substrate glass, resulting in a decrease in the brightness of the image display, which is an obstacle to improving the contrast. It is also because the whole panel looks yellow and reduces the commercial value. It is clear that the coloring or coloring of the glass substrate caused by the use of such an electrode containing silver can be suppressed by polishing the electrode formation surface side of the glass substrate and removing the reducing layer formed on the surface. (Example: JP-A-10-2
55669). According to this, although it is possible to manufacture a glass substrate having a low degree of color development, when it is applied to the manufacturing process of a glass substrate for PDP, a step of removing the surface layer is required, which improves mass productivity. Is a new issue.

The present invention has been made to solve the above problems, and is a substrate formed of silver ions when an electrode is formed of a material containing silver on a substrate glass used for a display device such as a PDP using a float glass. Coloring of glass (yellowing)
It is an object of the present invention to provide a display device with reduced power consumption.

[0016]

A display device according to the present invention has a glass substrate and an electrode layer having a plurality of conductive layers formed on one surface of the glass substrate. Is a layer containing silver, and at least one layer between the conductive layer containing silver and the glass substrate has a structure containing an element having a greater ionization tendency than silver. Further, the display device of the present invention has a glass substrate and an electrode layer provided with a plurality of conductive layers formed on one surface of the glass substrate, and the electrode layers are separated from each other and have a narrower width. At least one of the conductive layers in the electrode layer is a layer containing silver, and at least one layer between the conductive layer containing silver and the glass substrate contains an element having a greater ionization tendency than silver. It has a configuration including. In addition to these constitutions, the display device of the present invention has a layer containing an element having a greater ionization tendency than silver and a layer containing a black pigment under the layer containing silver, and has three or more layers. ,
Alternatively, in a layer containing an element having a higher ionization tendency than silver, a black pigment is added to the element having a higher ionization tendency than silver, and the elements having a higher ionization tendency than silver are copper, iron, tin, nickel, cobalt, and chromium. At least one of zinc, aluminum, magnesium, calcium, and potassium, and also has a configuration containing the element in the state of metal or metal oxide.

With these configurations, in the display device of the present invention, the color suppression layer composed of a layer containing an element having a greater ionization tendency than silver is provided immediately below the conductor layer containing silver, and the heat treatment process in the manufacturing process is performed. Changes silver into silver ions, and in the process of diffusion of these silver ions to the substrate side, elements with a large ionization tendency are ionized, and the emitted electrons are received by the silver ions, becoming metallic silver and the diffusion is interrupted. In addition, silver ions do not diffuse into the substrate glass, and coloring or coloring can be suppressed, and by providing a black layer, a PDP with high contrast and high brightness can be realized.

The method for producing an electrode for a display device of the present invention is a method for forming an electrode formed on a float glass substrate and comprising a plurality of conductive layers, after forming a layer containing an element having a greater ionization tendency than silver. , And a structure including a step of forming a conductor layer containing silver. The method for producing an electrode for a display device of the present invention is a method for forming an electrode having a layer structure of at least three layers or more on a float glass substrate, and before forming a layer containing an element having a greater ionization tendency than silver, Alternatively, it has a structure including a step of forming a layer containing a black pigment after the formation, and then forming a conductor layer containing silver. Furthermore, in the method for manufacturing an electrode for a display device of the present invention, any one of a layer containing an element having a greater ionization tendency than silver, a layer containing a black pigment, and a conductor layer containing silver is a screen printing method, a photolithography method, or an etching method. It also has a configuration including a step of forming any one of the forming methods selected from the above or a combination of two or more methods. With these configurations, a material containing an element having a greater ionization tendency than silver is formed by screen printing, a photolithography method, an etching method, etc., and then an electrode material containing silver is similarly screen printed, a photolithography method, an etching method, etc. on this layer. Since the electrode containing an element having a greater ionization tendency than silver is located between the glass substrate and the conductor layer containing silver, an electrode having a layer structure of at least two layers is formed on the substrate. The coloring mechanism starting from the diffusion process to the glass substrate cannot occur, and it is possible to form an electrode for PDP which has a structure for suppressing coloring and which requires high-precision smoothness.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the front substrate of the display device of the present invention comprises a layer containing an element having a higher ionization tendency than silver in a layer immediately below a conductor layer containing silver as an electrode to be formed. It has a structure in which a color suppression layer is provided. Before describing the details of the embodiments of the invention, a specific material for forming the color suppression layer will be described in some detail.

[0020] The substrate glass is colored yellow or color is changed to silver ions (Ag ⁺⁾ in the course of heat treatment silver silver conductive layer (Ag) is in the manufacturing process, the silver ions (Ag ⁺⁾ in the glass And is reduced by tin ions (Sn ⁺⁺ ) present in the reduction layer on the surface of the float glass to form a colloid of metallic silver (Ag). the heat treatment for forming the silver (Ag), can be suppressed or are in the surface of a glass substrate silver ions (Ag ⁺⁾ diffused transparent electrode, that the silver ions (Ag ⁺⁾ are entering the substrate glass In that case, the substrate glass will not be colored or develop yellow. To this end, the heat treatment for forming silver (Ag) in the silver conductive layer of the bus electrode removes the silver ions (Ag ⁺ ) before the silver ions (Ag ⁺ ) diffuse through the transparent electrode on the front substrate glass. It may be reduced to metallic silver that is not a colloid. Since silver ions (Ag ⁺ ) are reduced to metallic silver if an element having a greater ionization tendency than silver is present, the layer containing an element having a larger ionization tendency than silver is suppressed between the silver conductive layer and the substrate glass. If provided as a layer, silver ions from the silver conductive layer generated by the treatment of the manufacturing process of the front substrate are reduced to non-colloidal metallic silver by an element having a greater ionization tendency than silver contained in the color suppression layer, As a result, it is considered that yellowing is suppressed.

Generally, as elements having a greater ionization tendency than silver (Ag), copper (divalent), iron (trivalent), tin (2)
(Valent), nickel, cobalt (divalent), iron (divalent), chromium (trivalent), zinc, aluminum, magnesium, calcium, potassium and the like are known. Therefore, a simple substance, an alloy of a metal element having a greater ionization tendency than the above silver,
If the front substrate is manufactured by forming the coloring suppressing layer with a material containing a metal compound or a composite compound, it is expected that the coloring or coloring of the front substrate glass can be suppressed.

FIG. 1 shows an embodiment of the present invention.
7 to FIG. 2, 4, and 6 showing the configuration and structure of the PDP in the embodiment of the present invention.
Already follows the configuration and structure of the AC-PDP described in the related art with reference to FIG.

(Embodiment 1) FIG. 2 schematically shows an example of an electrode structure of a PDP according to Embodiment 1 of the present invention. FIG. 2 shows a cross section of the front substrate cut in the direction perpendicular to the row electrodes, with the electrode formation surface side of the front substrate glass facing downward, as in FIGS. 1 (a) and 1 (b).

In FIG. 2, the transparent electrode 100 and the color suppression layer 10 are formed on the front substrate glass 10 formed by the float method.
3 and the silver conductive layer 101 are laminated in this order to form an electrode. The transparent electrode 100 is made of ITO and is patterned to have a width of 300 μm and a thickness of 1000Å. Following the transparent electrode 100, a bus electrode is formed of a material containing silver having a low electric resistance. In the heat treatment step at the time of forming the electrode, silver of the metal element contained in the silver conductive layer 101 to be the bus electrode changes into silver ion, and the generated silver ion colors the front substrate glass 10 formed by the float method. In order to suppress coloring, the coloring suppressing layer 10 is provided between the silver conductive layer 101 and the transparent electrode 100.
3 is formed. As described above, it is important to use an element having a greater ionization tendency than silver as the material for forming the color suppression layer 103, but it is preferable that it is easily available and inexpensive. Here, SnO, which is a divalent tin (Sn) oxide that is compatible with ITO of the transparent electrode 100 and is easy to form an electrode, was selected to form the color suppression layer 103. Both the silver conductive layer 101 and the color suppression layer 103 have a width of 120
A pattern having a thickness of 3 μm was formed.

Next, the PD according to the first embodiment of the present invention
The procedure of the manufacturing process for forming the electrodes of the P front substrate 1 will be briefly described. FIG. 3 is a PD according to the first embodiment of the present invention.
It is a flow chart which shows roughly an example of the manufacturing process for forming the electrode of front substrate 1 of P. On the right side of FIG. 3, cross sections of the front substrate 1 in respective steps are shown in order to understand the actual processing contents. Here, unlike the cross-sectional view in FIG. 2, the electrode formation surface side of the substrate glass is shown facing upward so as to be the same as the processing state in the process. In FIG. 3, the first step A1 is to form the transparent electrode 100 on the front substrate glass 10 formed by the float method.
Is a step of patterning. Here, details of the transparent electrode forming step are not shown, and only the state where the transparent electrode 100 is patterned on the front substrate glass 10 is shown.

The second step A2 is a step of applying and drying a photosensitive paste 201 containing SnO, which is a divalent tin (Sn) oxide, which is to be the color suppression layer 103. After applying the photosensitive paste 201 containing SnO by screen printing, for example, at 80 ° C. in a warm air drying oven or the like.
Drying is performed for 30 minutes.

Further, as a coating method, slit coating or the like can be used in addition to screen printing. The method for forming the coloration suppressing layer is not limited to the method of exposing and developing the photosensitive layer coated on the entire surface by printing or coating as described above, and patterning in advance a predetermined pattern into a sheet. A method of sticking to the substrate is also possible. Also,
In addition to the warm air drying oven, an infrared (IR) drying oven or the like can be used for drying. Although the treatment conditions such as the drying temperature and the drying time also vary depending on the method, means and material used, conditions suitable for each condition can be set arbitrarily.

Third step A in the flow chart shown in FIG.
3 is a divalent tin (S) for forming the color suppression layer 103.
In this step, a photosensitive paste containing the oxide SnO of n) is applied and dried, and the film is exposed to ultraviolet light through the exposure mask 202. A negative exposure mask 202 on which a predetermined electrode pattern is formed is set, and, for example, ultraviolet rays 203 guided from an ultra-high pressure mercury lamp light source are exposed to, for example, 300 m.
Exposure is performed by irradiating with an exposure energy of J / cm ² . When using a positive photosensitive paste,
An exposure mask may be used so that the patterned portion is unexposed. Further, the exposure energy may be appropriately selected in accordance with the characteristics of the photosensitive paste to be used, and is not limited to the above-mentioned specific conditions.

In the fourth step A4, the exposed photosensitive paste film containing SnO serving as the color suppression layer is developed with, for example, an alkaline aqueous solution (0.3 wt% sodium carbonate aqueous solution) to form a pattern. This is a step of baking in the air at 600 ° C. to fix the substrate.

As the developing solution, an organic solvent can be used depending on the photosensitive material used, and the concentration thereof can be changed appropriately. Further, the firing temperature can be changed according to the photosensitive paste, and the firing temperature is not limited to the conditions described in the first embodiment of the present invention.

The fifth step A5, the sixth step A6, and the seventh step A7 in FIG. 3 correspond to the above-described second step A2, third step A3, and fourth step A4, respectively. Therefore, the photosensitive paste to be used is not the layer 201 containing the color suppression layer material made of a photosensitive paste containing the oxide SnO of divalent tin (Sn) for forming the color suppression layer 103, but the silver conductive layer 101. Except that it is a silver-containing layer 204 made of a photosensitive paste containing silver for forming
Repeat almost the same process. To avoid duplication, the description of the fifth step A5 to the seventh step A7 is omitted.

By the steps A1 to A7 as described above, the front substrate 1 on which the electrode capable of suppressing yellow coloring of the glass substrate for PDP which requires high-precision smoothness is formed.
Can be manufactured.

As an example of the electrode structure of the PDP according to the embodiment of the present invention, the front substrate having electrodes formed in the respective structures shown in FIGS. 2, 4 and 6 has a yellow color of the glass substrate when baked at 600 ° C. The degree of coloring was measured. The results are shown in Table 1.

[0034]

[Table 1]

As a comparative example, a conventional electrode structure having a general PDP electrode structure without a coloring suppression layer, that is, FIG.
The front substrate 1 having the structure shown in (b) and FIG. 1 (c) was used. The electrode width, the thickness of each layer, and the firing temperature of the front substrate of the comparative example were in accordance with those of the front substrate illustrated in the first embodiment of the present invention.

The degree of yellow coloration was measured from the front surface side of each front substrate on which the color tone of the formed electrode was experimentally manufactured. Specifically, a commercially available colorimeter was used to measure the b * value of the L * a * b * color system (CIE1976) under a C light source (a type of standard light source). The L * a * b * color system is also called the CIELab color system, and is one of the uniform color spaces defined by the CIE (International Commission on Illumination) in 1976 in order to numerically express colors.
A color system using a color space that uses three-dimensional Cartesian coordinates. Color is expressed by two orthogonal axes of red-green (a *) and yellow-blue (b *) and a total of three axes of brightness (L *). In the L * a * b * color system, the larger the value of b *, the more yellow the color is. When the measured value b * of the degree of yellow coloring exceeds 5, the transparent (b * value is 0) glass substrate becomes yellow and looks unsuitable as a substrate for a display device.

In Table 1, the electrode structure having no color suppression layer shown as the comparative example, that is, the electrode having the structure shown in FIGS. 1B and 1C as the electrode structure of a general PDP is clear. It was confirmed that the value of b * exceeded 5 in both cases. On the other hand, in the electrode having the structure shown in FIG. 2, which is shown as an example of the electrode structure in the first embodiment of the present invention, that is, the electrode having the coloring suppression layer, the value of b * is 5 or less, and yellow coloring is visually recognized. The inspection could not admit. Therefore, by the SnO coloring suppression layer 103, silver ions from the silver conductive layer 101 generated by the processing in the manufacturing process of the front substrate 1 are reduced to metallic silver that is not in a colloidal state, and as a result, yellowing is suppressed. It is thought that it was done. Therefore, it is apparent that the yellow coloring of the glass substrate can be suppressed by providing the coloring suppressing layer.

In the first embodiment of the present invention, the case where ITO is used as the material of the transparent electrode 100 has been described.
It should be noted that the present invention is not limited to ITO, and that there is no problem even if other transparent electrode materials including, for example, tin oxide (SnO) doped with antimony (Sb) are used. deep.

In addition, the transparent electrode 100, the silver conductive layer 101, and the color suppression layer 10 shown and described in the first embodiment of the present invention.
The width and thickness of 3 are also examples, and the present invention is not limited to these examples of sizes and shapes, and it is obvious that the dimensions and shapes can be arbitrarily set.

(Embodiment 2) A display device according to Embodiment 2 of the present invention is the same as that shown in FIG.
The device configuration and the manufacturing process of FIG. 3 were followed. To avoid duplication, detailed description is omitted and only the differences are described.

In the display device according to the second embodiment of the present invention, tin (divalent) is used as the material for forming the color suppression layer 103 in the manufacturing process shown in FIG. ), SnO, FeO, Cr, which are metal oxides of zinc, iron, chromium, and copper (divalent), which are elements having a greater ionization tendency than silver, instead of SnO.
A front substrate 1 was manufactured by using a photosensitive paste containing O and CuO.

The four types of completed front substrates 1 containing the above-mentioned metal oxide as the color suppression layer 103 were visually inspected under external natural light and indoor fluorescent lamp illumination. As a result, no coloring or coloring was observed on the four types of front substrate glass 10. Therefore, the silver conductive layer 101 and the front substrate glass 1
It is clear that forming the color suppression layer with a material containing a metal element or its metal oxide having an ionization tendency higher than that of silver suppresses the coloring and coloring of the front substrate.

(Third Embodiment) FIG. 4 schematically shows an example of an electrode structure of a PDP according to a third embodiment of the present invention. In FIG. 4A, a part of the cross section of the front substrate cut in the direction perpendicular to the row electrodes is enlarged in the same manner as in FIG. 2 and the electrode formation surface side of the front substrate glass is shown face down.

The electrode structure of the PDP according to the third embodiment of the present invention has a transparent electrode 1 as shown in FIG.
00 and the color suppression layer 103 have the same configuration as that of the first embodiment except that the black layer 102 is formed to have the same width of 120 μm as the silver conductive layer 101 and the color suppression layer 103. In FIG. 4A, the same members as those in FIG. 2 are designated by the same reference numerals. In order to avoid duplication, detailed description of the same components as those of the first embodiment of the present invention will be omitted for the electrode structure of the PDP according to the third embodiment of the present invention.

In FIG. 4A, the black layer 102 is formed immediately above the transparent electrode 100 with a material containing a black pigment for the purpose of improving the contrast. Black layer 102
Has the same thickness of 3 μm as the silver conductive layer 101 and the color suppression layer 103.
m is patterned and laminated. The same constitution is provided under the silver conductive layer 101 to suppress the coloring of the front substrate by forming a coloring suppressing layer with a material containing a metal element having a higher ionization tendency than silver or a metal oxide thereof. Differently from the first embodiment, the black layer 102 is replaced with the color suppression layer 103 and the transparent electrode 100.
Even if it is formed between the two, the coloring of the coloring suppressing layer 103 is as shown in Table 1 where b *, which represents the degree of yellow coloring measured by using a commercially available colorimeter, for the color tone of the electrode is the smallest. It is clear that the suppression effect is great.

Next, the PD according to the third embodiment of the present invention
The procedure of the manufacturing process for forming the electrodes of the P front substrate 1 will be briefly described. FIG. 5 is a PD according to the third embodiment of the present invention.
It is a flow chart which shows roughly an example of the manufacturing process for forming the electrode of front substrate 1 of P. On the right side of FIG. 5, in order to understand the actual processing contents, the cross section of the front substrate 1 in each step is shown with the electrode formation surface side of the substrate glass facing upward.

The procedure of the step of forming the electrode of the PDP in the third embodiment of the present invention is the same as the step in the first embodiment, that is, the first step B1 for forming the transparent electrode and the second step in the first embodiment. A black layer 102 is provided between the color suppression layer 103 and the transparent electrode 100 during the fifth step B5 of the second embodiment for applying and drying a material containing an element having an ionization tendency larger than that of silver corresponding to the step. It is almost the same except that each of the second step B2, the third step B3, and the fourth step B4 for forming the above is added.

In FIG. 5, the second part for forming each member of the front substrate 1 of the PDP according to the third embodiment of the present invention.
Step B2 is a black pigment material layer 401 made of a photosensitive paste in which the black layer 102 is blended with a material containing a black pigment.
Is a process of coating and drying. In this step, a black pigment material layer 401 made of a photosensitive paste prepared with a material containing a black pigment is applied by, for example, screen printing, and then dried in a hot air drying oven or the like under the conditions of 80 ° C. for 30 minutes.

In the third embodiment B3 of the present invention, the third step B3 is a negative exposure mask 202 in which a predetermined electrode pattern is formed on a photosensitive paste 401 prepared by coating a material containing a black pigment. Is set, and ultraviolet rays 203 guided from a light source of an ultra-high pressure mercury lamp, for example,
Exposure is performed by irradiating with an exposure energy of 00 mJ / cm ² . Then, in the fourth step B4, the photosensitive paste 401 film prepared by using the material containing the exposed black pigment is developed with an alkaline aqueous solution (0.3 wt% sodium carbonate aqueous solution) to form a pattern, For example, 6
In this step, baking is performed in the atmosphere at 00 ° C. to fix the substrate. The steps of exposing, developing and baking can be the same as those described in the first embodiment. In this way, as shown in FIG. 5, the black layer 102 for the purpose of improving the contrast is formed immediately above the transparent electrode 100 with a material containing a black pigment.

In FIG. 5, fifth step B5 to tenth step
Up to step B10 corresponds to the second step A2 to the seventh step A7 in the first embodiment of the present invention. To avoid duplication, detailed description of the same steps as those in the first embodiment will be omitted.

The PD according to the third embodiment of the present invention
The various materials, devices, processing conditions, and the like described in the manufacturing process for forming each member of the P front substrate 1 are those exemplified in the first embodiment of the present invention except for the process of forming the black layer 102. Can be used as is. However, the present invention is not limited to these examples, various materials, devices,
It goes without saying that the processing conditions can be appropriately selected and set.

In this way, according to the process shown in FIG. 5, in addition to the color suppression layer 103 for suppressing the yellow coloring of the front substrate glass 10 by the silver conductive layer 101, the black layer 103 for improving the contrast of the display surface. The front substrate 1 having as a member can be formed.

The third embodiment of the present invention is shown in FIG.
4A, the black layer 102 and the color suppression layer 1 shown in FIG.
03 may be made into a single layer to form the composite layer 104. In this case, the manufacturing process shown in FIG. 5 includes the second process B2 to the fourth process B2.
The process B4 may be omitted, and the fifth process B5 may be a process of applying and drying a photosensitive paste prepared by mixing a black pigment and a material containing an element having an ionization tendency higher than that of silver. This is followed by a sixth step B6 of exposing this photosensitive paste and a seventh step of developing and baking. Finally, proceeding to the tenth step B10, in addition to the effect of improving the contrast of the display surface, the front substrate 1 having the composite layer 104 for suppressing the yellow coloring of the front substrate glass 10 by the silver conductive layer 101 as a member is provided. Can be formed. Figure 4
In the manufacturing process of the front substrate glass 10 having the configuration shown in (b), a photosensitive paste is applied and dried to expose, develop,
Since one firing cycle is omitted, there is a great effect that the number of manufacturing steps can be reduced.

Further, in the third embodiment of the present invention,
Front substrate glass 10, transparent electrode 100, color suppression layer 10
3, each of the members constituting the front substrate such as the silver conductive layer 101 can use the materials described in the first embodiment as they are. On the other hand, the black layer 10
No. 2 can be used as long as it is a material using a general black pigment, and is not limited to the description in the third embodiment of the present invention.

Furthermore, the dimensions and shapes of the transparent electrode 100, the silver conductive layer 101, and the color suppression layer 103, which are illustrated and described in the third embodiment of the present invention, such as width and thickness, are the same as those of the present invention except for the black layer 102. The one exemplified in the first embodiment can be used as it is. However, the present invention is not limited to these examples of dimensions and shapes, and it goes without saying that dimensions and shapes can be appropriately designed and set.

(Embodiment 4) FIG. 6 schematically shows an example of an electrode structure of a PDP according to Embodiment 4 of the present invention. In FIG. 6, a part of the cross section of the front substrate cut in the direction perpendicular to the row electrodes is enlarged similarly to FIGS. 2 and 4, and the electrode formation surface side of the front substrate glass is shown face down.

In the electrode structure of the PDP according to the fourth embodiment of the present invention, as is apparent from FIG. 6, the electrode member is directly laminated on the front substrate glass without forming the transparent electrode 100. This is different from the first and second embodiments. The layer configuration of each row electrode including the sustain electrode 13 and the scan electrode 14 is the same as that of the second embodiment of the present invention shown in FIG.
Similarly to the front substrate 1 of the PDP in, the black layer 102, the color suppression layer 103, and the silver conductive layer 101 are laminated in this order by pattern formation.

However, in FIG. 6, FIG. 2 and FIG.
The main difference is that the sustain electrodes 13 and the scan electrodes 14 that are row electrodes are divided into a plurality of narrow unit electrodes 106. That is, as shown in FIG. 6, the black layer 102, the color suppression layer 103, and the silver conductive layer 101 that form each unit electrode 106 all have the same width of 45 μm.
m, the pattern is formed with the same thickness of 3 μm. Then, the number of sustain electrodes 13 and scan electrodes 14 serving as row electrodes is 4
Each of the unit electrodes 106 is arranged as a set of four unit electrodes 106 arranged at intervals of 0 μm. In FIG. 6, FIG.
The same members as those in FIG. 4 are also given the same reference numerals. In order to avoid duplication, detailed description of the same components as those of the first and third embodiments of the present invention will be omitted for the electrode structure of the PDP in the fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the transparent electrode 100 is not formed, and the electrode member is directly laminated on the front substrate glass 10, and the sustain electrode 13 and the scan electrode 14 to be the row electrodes are further formed. The main point of the configuration in which the unit electrodes 106 are divided into a plurality of narrow widths is that the transparent electrode 100 is not provided and the display aperture ratio of each discharge cell is secured to maintain the display quality, and then the display quality is stabilized. It is to realize a low-priced PDP device by driving the PDP by electric discharge and saving the material cost of the transparent electrode 100 and the number of process steps.

In the electrode structure of the PDP according to the fourth embodiment of the present invention, the black layer 102 is formed directly on the front substrate glass 10 with a material containing a black pigment for the purpose of improving the contrast as in the third embodiment. To form.
The thickness of the black layer 102 is the silver conductive layer 101 and the color suppression layer 10.
The same thickness of 3 μm as that of No. 3 is used to form a pattern and the layers are laminated. The same constitution is provided under the silver conductive layer 101 to suppress the coloring of the front substrate by forming a coloring suppressing layer with a material containing a metal element having a higher ionization tendency than silver or a metal oxide thereof.

With respect to the front substrate on which the black layer 102 was formed directly on the front substrate glass 10, the phenomenon that the electrode portion of the front substrate glass turned yellow was not observed in the visual appearance check. With respect to the front substrate glass having the electrode structure according to the fourth embodiment of the present invention, the color tone of the electrodes was measured using a commercially available colorimeter. As shown in the results in Table 1, b *, which represents the degree of yellow coloring, has a smaller value than that in the first embodiment, and the coloring suppression layer 103 of the coloring suppression layer 103 has no transparent electrode or is subdivided into electrodes. It is clear that the effect of suppressing coloring is great.

Next, the PD according to the fourth embodiment of the present invention
The procedure of the manufacturing process for forming the electrodes of the P front substrate 1 will be briefly described. FIG. 7 is a PD according to the fourth embodiment of the present invention.
It is a flow chart which shows roughly an example of the manufacturing process for forming the electrode of front substrate 1 of P.

The procedure of the step of forming the electrodes of the PDP in the fourth embodiment of the present invention is the same as in the first and third embodiments.
In contrast to the process described in (1), the process for forming the transparent electrode is omitted. From the first step C1 of applying and drying a material containing a black pigment to form the black layer 102 in the fourth embodiment to the ninth step C9 of developing and baking to form the silver conductive film 101. Are almost the same as the second to tenth steps B2 to B10 in the third embodiment. To avoid duplication, detailed description of the same steps as those in the first and third embodiments will be omitted, and only different contents will be described.

As described above with respect to the electrode structure, in the fourth embodiment of the present invention, the sustain electrodes 13 and the scan electrodes 14 which are the row electrodes are divided into a plurality of unit electrodes 106 each having a small width. , An exposure mask 402 for patterning when forming a layer of each member in each exposure step corresponding to the second step C2, the fifth step C5, and the eighth step C8 in FIG. 7 is different. There is. In terms of steps, almost the same procedure as that of the third embodiment is performed, and the unit electrodes 106 in which the sustain electrodes 13 and the scan electrodes 14 serving as row electrodes are subdivided into a width of 45 μm are arranged as a set of four unit electrodes 106 at intervals of 40 μm. Then, the front substrate 1 is formed.

In this way, according to the process shown in FIG. 7, in addition to the color suppression layer 103 for suppressing the yellow coloring of the front substrate glass 10 by the silver conductive layer 101, the black layer 102 for improving the contrast of the display surface. It is possible to form the front substrate 1 that has as a member.

Also in the fourth embodiment of the present invention, the black layer 102 is the same as described in the third embodiment.
The coloring suppressing layer 103 may be formed as a single layer to form a composite layer (not shown). In this case, the manufacturing process shown in FIG.
The first step C1 to the third step C3 are omitted, and the fourth step C4 is applied with a photosensitive paste prepared by mixing a black pigment and a material containing an element having a greater ionization tendency than silver, and dried. The process may be performed. In this case also, in addition to the effect of improving the contrast of the display surface, the silver conductive layer 1
The front substrate 1 having the composite layer 104 for suppressing the yellow coloring of the front substrate glass 10 by 01 as each member can be formed.

In the fourth embodiment of the present invention,
Front substrate glass 10, coloring suppression layer 103, silver conductive layer 10
The materials described in the third embodiment can be used as they are for the respective members constituting the front substrate 1, such as 1 and the black layer 102. Further, as the various materials, devices, processing conditions, etc. described in the manufacturing process for forming each member of the front substrate 1 of the PDP, those exemplified in the third embodiment of the present invention can be used as they are. However, the present invention is not limited to these examples, and the dimensions and shapes, various materials, devices, processing conditions, etc. are appropriately designed and set,
It goes without saying that you can select.

[0068]

As described above, according to the electrode and the method for manufacturing the electrode of the present invention, the float glass PDP is used.
It is possible to reduce yellow coloring of the substrate glass due to silver ions when a PDP electrode that requires high-precision smoothness is formed on the front substrate of the above, and there is no decrease in brightness. , P with high contrast and high display quality
DP can be provided.

[Brief description of drawings]

1A is a sectional perspective view showing a general structure of an AC type PDP, FIG. 1B is an enlarged sectional view showing an example of the structure of an AC type PDP front substrate, and FIG. 1C is another structure of the AC type PDP front substrate. Enlarged sectional view showing an example

FIG. 2 is an enlarged cross-sectional view showing the structure of the PDP front substrate according to the first and second embodiments of the present invention.

FIG. 3 is a flowchart showing an example of a manufacturing process of the PDP front substrate according to the first and second embodiments of the present invention.

FIG. 4 is an enlarged sectional view showing a structure of a PDP front substrate according to a third embodiment of the present invention.

FIG. 5 is a flowchart showing an example of a manufacturing process of a PDP front substrate according to the third embodiment of the present invention.

FIG. 6 is an enlarged sectional view showing a structure of a PDP front substrate according to a fourth embodiment of the present invention.

FIG. 7 is a flow chart showing an example of a manufacturing process of a PDP front substrate according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating yellow coloring of float glass by a bus electrode containing silver.

[Explanation of symbols]

1 Front substrate 2 Back substrate 3 discharge space 10 Front substrate glass 11 Dielectric layer 12 Protective layer 13 Sustain electrode 14 scanning electrodes 15 Black Matrix 16 Rear substrate glass 17 Base dielectric layer 18 partitions 19 address electrodes 20 Phosphor layer 100 transparent electrode 101 silver conductive layer 102 black layer 103 Color suppression layer 104 composite layer 105 colored layer 106 unit electrode 201 Layer containing color suppression layer material 202,402 exposure mask 203 UV light 204 a layer containing silver 401 Black pigment material layer A1, B1, C1 First step A2, B2, C2 Second step A3, B3, C3 Third step A4, B4, C4 Fourth step A5, B5, C5 Fifth step A6, B6, C6 6th process A7, B7, C7 7th process B8, C8 Eighth process B9, C9 ninth step B10 Tenth step

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Ashida             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Sei Nakagawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Daisuke Adachi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C027 AA01                 5C040 FA01 GB02 GB12 GC18 JA12                       JA14 JA15 KA01 KB29 MA02                       MA03 MA23 MA30

Claims (8)

[Claims] 1. A glass substrate, and an electrode layer having a plurality of conductive layers formed on one surface of the glass substrate, wherein at least one of the conductive layers in the electrode layer contains silver. A display device, which is a layer and at least one layer between the conductive layer containing silver and the glass substrate is a layer containing an element having a greater ionization tendency than silver. 2. A plurality of electrode layers having a glass substrate and an electrode layer having a plurality of conductive layers formed on one surface of the glass substrate, the electrode layers being separated from each other and having a narrower width. And at least one layer of the conductive layer in the electrode layer is a layer containing silver, and at least one layer between the conductive layer containing silver and the glass substrate is more ionizable than silver. A display device, which is a layer containing a large element. 3. The silver-containing layer has a layer below the silver-containing layer, a layer containing an element having a greater ionization tendency than silver, and a layer containing a black pigment, and is composed of three or more layers. Alternatively, the display device according to claim 2. 4. The layer containing an element having a higher ionization tendency than silver contains a black pigment in addition to the element having a higher ionization tendency than silver.
Display device according to. 5. The element having a greater ionization tendency than silver is copper, iron, tin, nickel, cobalt, chromium, zinc,
The display device according to claim 1, wherein the display device is at least one of aluminum, magnesium, calcium, and potassium, and contains the element in a metal or metal oxide state. 6. A method of manufacturing a display device having a glass substrate and an electrode layer having a plurality of conductive layers formed on one surface of the glass substrate, wherein the electrode layer is ionized from silver. After forming a layer containing elements with a high tendency,
A method of manufacturing a display device, comprising a step of forming a conductor layer containing silver. 7. A method for forming an electrode having a layer structure of at least three layers or more on a float glass substrate, comprising a black pigment before or after forming a layer containing an element having a greater ionization tendency than silver. A method of manufacturing an electrode for a display device, comprising the steps of forming a layer and then forming a conductor layer containing silver. 8. A forming method, wherein any one of a layer containing an element having a higher ionization tendency than silver, a layer containing the black pigment, and a conductor layer containing silver is selected from a screen printing method, a photolithography method, and an etching method. 8. The method for manufacturing an electrode for a display device according to claim 6 or 7, further comprising a step of forming any one of the above methods or a combination of two or more methods.