JP3582248B2 - Gas discharge display panel and method of manufacturing the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas discharge display panel used for a display terminal or a display device of a computer, and a method for manufacturing the same.
[0002]
2. Description of the Related Art Plasma display panels (PDPs), which are known as gas discharge display panels, are generally widely used as display means for OA equipment because of their excellent display brightness and contrast. It has attracted attention as a large full-color flat panel display capable of displaying. For this reason, there is a demand for the flat panel to realize a clear, high-contrast screen with good contrast and to reduce the cost by reducing the number of steps in the manufacturing process and improving the yield.
[0003]
[Prior art]
As a conventional gas discharge display panel of, for example, an AC drive type, a basic structure of a surface discharge type plasma display panel (PDP) for color display has a matrix display unit as shown in an exploded perspective view of a main part in FIG. The light emitting region EU has a three-electrode structure in which the display electrode 12 composed of a pair of X and Y and the address electrode A correspond to each other.
[0004]
The display electrode 12 composed of a pair of X and Y for surface discharge forming the display line is provided on the glass substrate 11 on the display surface H side with respect to the discharge space 24, and minimizes shielding of display light. In order to minimize the thickness, a transparent electrode 12a made of a transparent conductive film such as a Nesa film or an ITO (Indium Tin Oxide) film and a metal auxiliary electrode 12b made of a metal film for supplementing the conductivity (lowering resistance) are laminated. It consists of a configuration.
[0005]
The display electrode 12 is covered with a dielectric layer 13 for AC driving for maintaining gas discharge using wall charges in an insulating state with respect to the discharge space 24. Is further provided with a protective film 14 made of an MgO film having a thickness of about several thousand mm.
[0006]
On the other hand, the address electrodes A for selectively emitting light in the unit light emitting region EU are arranged on the rear glass substrate 21 at a constant pitch so as to be orthogonal to the pair of X and Y display electrodes 12. A stripe-shaped partition wall 22 having a height of about 100 to 150 μm is provided between each address electrode A, so that the discharge space 24 is formed in the line direction (extending direction of the display electrode 12) for each unit light emitting region EU. And the distance between the discharge spaces 24 is defined.
[0007]
Further, the three primary colors of R (red), G (green) and B (blue) are coated on the glass substrate 21 so as to cover the inner surface on the back side including the upper surface of the address electrode A and the side surfaces of the partition walls 22. A phosphor 23 is provided. In the PDP 1 having such a configuration, the phosphors 23 of respective colors are excited by ultraviolet rays radiated from the gas discharge in the discharge space 24 at the time of surface discharge to emit light, and a full-color display by a combination of R, G, and B is possible. In the display, the partition 22 prevents crosstalk between the unit light emitting areas EU.
[0008]
In the PDP 1 having the above-described configuration, predetermined components are individually provided for each of the glass substrates 11 and 21 as described above, and then the glass substrates 11 and 21 are arranged to face each other and the periphery of the gap is hermetically sealed. It is manufactured by a series of steps of sealing and evacuating the inside once and filling a discharge gas.
[0009]
In addition, the non-discharge portion (non-display line) between the plurality of display electrodes 12 arranged on the glass substrate 11 on the display surface H side is formed by the phosphor 23 provided on the glass substrate 21 on the back side. In order to prevent the disadvantage that the contrast is reduced due to the reflection of light from the outside, a light-shielding film 15 is provided as shown in the sectional view of the main part of FIG.
[0010]
[Problems to be solved by the invention]
By the way, as shown in FIG. 5, a display electrode 12 made of a pair of X and Y in the above-mentioned conventional PDP 1 has a metal on a transparent electrode 12a made of a transparent conductive film to supplement the conductivity (to reduce the resistance). A metal film having a three-layer structure of chromium (Cr) -copper (Cu) -chromium (Cr) having excellent electrical characteristics and excellent adhesion to the glass substrate 11 and the dielectric layer is used as the auxiliary electrode 12b in a sputtering process or vacuum deposition. Although the metal auxiliary electrode 12b is formed in an overlapping manner by a process or the like, the electric resistance of the metal auxiliary electrode 12b still tends to be high (about 20 to 30 mΩ / □), and it is necessary to further reduce the resistance to about 10 mΩ / □. In addition, there has been a problem that it is difficult to increase the size of an apparatus (such as a sputtering apparatus) for forming the metal auxiliary electrode 12b in response to such an increase in the size of the PDP 1.
[0011]
Therefore, as a method for solving such a problem, it is well known that a silver (Ag) film is applied to the metal auxiliary electrode to reduce the resistance. Therefore, a silver (Ag) paste is used for the metal auxiliary electrode. When formed by a coating process and a photolithography process, the metal auxiliary electrode made of a silver (Ag) film becomes white after baking, and the contrast is reduced due to strong reflection of external light on the white surface, thereby causing a display to be performed. There is a problem that an image is difficult to see, and the display quality is deteriorated.
[0012]
In view of the above-mentioned conventional problems, the present invention not only provides a light-shielding film for preventing light reflection at a non-discharge portion between display electrodes, but also reduces the resistance of a metal auxiliary electrode laminated on a transparent electrode and reduces light reflection. It is an object of the present invention to provide a novel gas discharge display panel in which the display quality is improved by preventing a decrease in the contrast of the display screen by reducing the rate, and a method for manufacturing the same.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention forms a discharge space between a pair of opposed substrates and forms a plurality of pairs of display electrodes for surface discharge forming a plurality of display lines on the inner surface of one of the substrates on the display surface side. A gas discharge display panel in which each display electrode is composed of a strip-shaped transparent electrode and a narrow metal auxiliary electrode superimposed on the transparent electrode, wherein the display is a non-display line between the display lines. between the between the electrode pairs and the transparent electrode and a metal auxiliary electrode in each of the display electrodes, a dark shielding layer of conductive by the same material and the same process and their respective settings only configuration.
[0014]
Further, as a method for producing the gas discharge display panel forms a dark shading layer pairs transparent electrode formed was board on a conductive comprising and a black pigment metallic materials for surface discharge, with leaving a narrow band than the transparent electrode width the dark shading layer on the transparent electrode, a step of leaving be a clearance between the transparent electrode pairs, the transparent electrode, substrate with the dark shading layer is formed the metal film for auxiliary electrode is formed on, and a step to the metal film selectively leaving the metal auxiliary electrode covering the dark color light-shielding layer on the strip formed on the transparent electrode Is characterized by the following.
[0015]
In the present invention, between the transparent electrode constituting the display electrode and the metal auxiliary electrode such as a silver film, and the non-discharge portion between the pair of adjacent transparent electrodes, the light reflectance is higher than that of the metal auxiliary electrode. Low conductivity, for example, including a black pigment composed of manganese (Mn) -iron (Fe) -copper (Cu) -based oxide and chromium (Cr) -Cu-based oxide and metal fine particles composed of Cu, Ni and Ag. By providing a dark light-shielding layer at the same time, it is possible not only to prevent light reflection at the non-discharge portion, but also to lower the resistance of the metal auxiliary electrode and reduce the light reflectance, so that the display screen Is improved over the entire surface to make it easier to see, and it is possible to improve display quality at low cost by reducing man-hours.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view of a main part showing an embodiment of a gas discharge display panel according to the present invention, and portions having the same functions as those in FIG. 5 are denoted by the same reference numerals.
[0017]
In this embodiment, a transparent conductive film such as a Nesa film or an ITO (Indium Tin Oxide) film is used in a pair of X and Y display electrodes 38 provided in stripes on a glass substrate 11 on the display surface side as shown in the figure. Between the transparent electrode 12a made of and a metal auxiliary electrode 37 made of a silver (Ag) film for supplementing conductivity (lowering resistance) provided on each of the transparent electrodes 12a, A non-discharge portion between a pair of adjacent transparent electrodes 12a has a light reflectance lower than that of the metal auxiliary electrode 37, such as a manganese (Mn) -iron (Fe) -copper (Cu) -based oxide and chromium. A structure is provided in which a black pigment made of a (Cr) -Cu-based oxide and a conductive first dark light-shielding layer 33 and a second dark light-shielding layer 34 containing metal fine particles made of Cu, Ni and Ag are simultaneously provided. There.
[0018]
The second dark light-shielding layer 34 is electrically disconnected from the display electrode 38 as shown in FIG.
The display electrodes are discharged by the dielectric layer 13 having a thickness of about 30 to 40 μm on the glass substrate 11 on the display surface side on which the pair of X and Y display electrodes 38 having such a configuration are arranged. The dielectric layer 13 is covered so as to be insulated from the space, and a protective film 14 made of an MgO film having a thickness of about several thousand degrees is further provided on the surface of the dielectric layer 13.
[0019]
A structure in which a phosphor is provided between the glass substrate 11 on the display surface side having such a configuration and each of a plurality of partition walls provided on the address electrodes and the same address electrodes as described in the related art separately. And a glass substrate on the rear side of the substrate is overlapped with a discharge gap therebetween, the periphery of the opposed gap is hermetically sealed, and the inside exhaust gas and discharge gas are sealed to complete the panel.
[0020]
In the panel configured as described above, even if a silver (Ag) film having a lower resistance and a higher external light reflectance than the conventional one is used for the metal auxiliary electrode 37 for supplementing the conductivity of the transparent electrode 12a, the transparent electrode can be used. The same applies to the conductive first dark light-shielding layer 33 having a lower light reflectance than the metal auxiliary electrode 37 between the metal auxiliary electrode 37 and the non-discharge portion between the pair of adjacent transparent electrodes 12a. Since the conductive second dark-colored light-shielding layer 34 made of a suitable material is provided, the light reflectance of the metal auxiliary electrode 37 is reduced, and the light reflectance of the second dark-colored light-shielding layer 34 in the non-discharge portion is reduced. In combination with the decrease in the contrast, the contrast of the display screen is easily improved over the entire surface, and the display screen is easy to see.
[0021]
Next, a method for manufacturing the gas discharge display panel will be described.
2 and 3 are cross-sectional views of a main part for sequentially explaining one embodiment of a method of manufacturing a gas discharge display panel according to the present invention.
[0022]
First, as shown in FIG. 2A, a transparent conductive film such as SnO ₂ or ITO (Indium Tin Oxide) is formed on the entire surface of the glass substrate 11 on the display surface side by a vacuum evaporation method, a sputtering method, or the like. The transparent conductive film is patterned in a stripe shape by a photolithography process, and a pair of transparent electrodes 12a of X and Y adjacent to each other are formed in a plurality of rows at predetermined intervals.
[0023]
Further, on the glass substrate 11 including the pair of transparent electrodes 12a, for example, a black pigment composed of an Mn-Fe-Cu-based oxide and a Cr-Cu-based oxide and metal fine particles composed of Cu, Ni, and Ag are provided. Is uniformly applied by a screen printing method or the like, and dried at a temperature of about 80 to 120 ° C. to form a photosensitive black film 31.
[0024]
Next, as shown in FIG. 2B, the photosensitive black film 31 is irradiated with light through a predetermined exposure mask 32 and patterned by a photolithography step of developing, as shown in FIG. 2C. Forming a first dark-colored light-shielding layer 33 on each transparent electrode 12a and a second dark-colored light-shielding layer 34 in a non-discharge portion between a pair of adjacent transparent electrodes 12a; 33 and the second dark-colored light-shielding layer 34 are subjected to a heat curing treatment or a light curing treatment at a temperature of about 100 to 150 ° C.
[0025]
Next, a first dark-colored light-shielding layer 33 is formed on each of the transparent electrodes 12a, and a second dark-colored light-shielding layer 34 is also formed on a non-discharge portion between a pair of adjacent transparent electrodes 12a. As shown in FIG. 3A, a silver paste obtained by mixing silver (Ag) fine powder with a photosensitive binder is uniformly applied to the surface by a screen printing method or the like, and dried at a temperature of about 80 to 120 ° C. Thus, a photosensitive metal film 35 is formed.
[0026]
Next, as shown in FIG. 3B, the photosensitive metal film 35 is patterned by a photolithography process of irradiating light through a predetermined exposure mask 36 and developing, as shown in FIG. 3C. After forming a metal auxiliary electrode 37 made of a silver (Ag) film on each of the transparent electrodes 12a via a first dark light shielding layer 33, the first dark light shielding layer 33, the second dark light shielding layer 34, and the metal auxiliary electrode 37 are formed. The electrode 37 is simultaneously baked at a temperature of about 500 to 600 ° C.
[0027]
As shown in FIG. 1, an insulating material such as a low-melting glass is provided on the glass substrate 11 on the display surface side on which the pair of X and Y display electrodes 38 and the second dark light-shielding layer 34 having the above-described configuration are arranged. The paste is uniformly applied by a screen printing method or the like, dried at a temperature of about 100 to 150 ° C., and then subjected to a baking treatment at a temperature of about 500 to 600 ° C. for the insulating film made of the low melting point glass or the like. A first dark shielding layer 33 having a thickness of 1 to 3 μm, a metal auxiliary electrode 37 having a thickness of 1 to 5 μm, and second dark shielding layers 34 and 30 having a thickness of 1 to 3 μm on the transparent electrode 12a. A glass on the display surface side in which a dielectric layer 13 made of an insulating film such as a low melting point glass having a thickness of about 40 μm and a protective film 14 made of an MgO film having a thickness of about several thousand mm are further provided on the entire surface. The substrate 11 is obtained.
[0028]
Therefore, the rear surface side of the structure in which the phosphor is provided between the glass substrate 11 on the display surface side having such a configuration and the plurality of partition walls provided on the address electrodes and the address electrodes separately similar to the conventional example. The glass substrate is overlapped with a discharge gap formed by the partition walls, the periphery of the opposing gap is hermetically sealed, the inside is evacuated, and a discharge gas is sealed to complete the panel.
[0029]
According to the above-described embodiment, the first dark-color light-shielding layer 33 and the second dark-color light-shielding layer 34 are formed by using the same metal paste and performing the steps from the application process to the curing process simultaneously in parallel. It is not necessary to separately form the first dark light shielding layer 33 and the second dark light shielding layer 34, and the first dark light shielding layer 33, the second dark light shielding layer 34, and the metal auxiliary electrode 37 are formed by firing. The gas discharge display panel can be manufactured efficiently and at low cost.
[0030]
In addition, as an etching technique used for patterning each of the dark light shielding layers and the electrode layers, either wet etching or dry etching may be selected and used as necessary.
[0031]
Further, in this embodiment, a gas discharge display panel for a surface discharge type plasma display for color display is described, but the present invention is limited to such a surface discharge type plasma display for color display. Instead, the present invention can be applied to a gas discharge display panel of this type such as a surface discharge type plasma display for monochrome display.
[0032]
【The invention's effect】
As is clear from the above description, according to the gas discharge display panel and the method of manufacturing the same of the present invention, the transparent electrode constituting the display electrode and the low-resistance metal auxiliary electrode such as a silver film are arranged. In a plurality of pairs of transparent electrodes, a non-discharge portion between a pair of adjacent transparent electrodes (between display electrodes) has a light reflectance lower than that of the metal auxiliary electrode, for example, an Mn-Fe-Cu-based oxide and Cr. A conductive dark-colored light-shielding layer containing a black pigment made of a Cu-based oxide and metal fine particles made of Cu, Ni and Ag is simultaneously formed and provided; As well as preventing reflection, the resistance of the metal auxiliary electrode can be reduced and the light reflectance can be significantly reduced, so that the contrast of the display screen has been improved over the entire surface, making it easier to see, resulting in good display quality and reduced man-hours. By This makes it possible to easily obtain a low-cost gas discharge display panel, and has a practically excellent effect.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a main part of an embodiment of a gas discharge display panel according to the present invention.
FIG. 2 is a sectional view of a main part for sequentially explaining one embodiment of a method for manufacturing a gas discharge display panel of the present invention.
FIG. 3 is a cross-sectional view of a main part, in which one embodiment of a method for manufacturing a gas discharge display panel according to the present invention will be described in succession to FIG. 2;
FIG. 4 is an exploded perspective view of an essential part showing an example of a gas discharge display panel.
FIG.
FIG. 5 is a cross-sectional view of a main part illustrating a conventional gas discharge display panel.
[Explanation of symbols]
1 PDP
11 Glass substrate 12, 38 Display electrode 12a Transparent electrode 12b, 37 Metal auxiliary electrode 13 Dielectric layer 14 Protective film 31 Black film 32, 36 Exposure mask 33 First dark light shielding layer 34 Second dark light shielding layer 35 Metal film

Claims (2)

The discharge space formed between a pair of substrates facing, arranging a plurality of pairs of display electrodes for forming a surface discharge a plurality of display lines on the inner surface of one substrate of display surface side, the respective display electrodes transparency electrode And a gas discharge display panel comprising a narrow metal auxiliary electrode overlapped with the transparent electrode,
Between the non-display between the display electrode pair is a line and a transparent electrode and a metal auxiliary electrode in each of the display electrodes between the display lines, each provided with it a dark shading layer of conductive by the same material and the same process Characteristic gas discharge display panel. Forming a metal material and a black pigment and comprising a conductive dark shading layer pairs of transparent electrodes formed was based board for surface discharge, the transparent electrode the dark shading layer on the transparent electrode Leaving in a band narrower than the width, leaving a gap between the transparent electrode pair,
The transparent electrode, selecting the dark shading layer a metal film for auxiliary electrode formed on a substrate formed, the metal film covering the dark color light-shielding layer on the strip formed on the transparent electrode 2. A method for manufacturing a gas discharge display panel according to claim 1, further comprising the step of forming a metal auxiliary electrode by leaving the metal auxiliary electrode.

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