KR100329046B1 - Manufacturing Method of Front Board of Plasma Display Panel - Google Patents

Abstract

The present invention discloses a method for fabricating a front substrate of a plasma display panel, in which the alignment between the black pattern and the discharge sustaining electrode is made stable while preventing an increase in the number of processes and an increase in cost due to the formation of the black pattern. Method of manufacturing a front substrate of a display panel includes forming transparent electrodes on a glass substrate; Coating an electrode material having a black color on the glass substrate on which the transparent electrodes are formed; Patterning the electrode material to form a first bus electrode on each transparent electrode, and forming black patterns on portions of the glass substrate between the discharge cells; Forming a second bus electrode on the first bus electrode; And applying a dielectric layer on the result until the step of forming the second bus electrode.

Description

Manufacturing Method of Front Board of Plasma Display Panel

The present invention relates to a plasma display panel, and more particularly, to a method of manufacturing a front substrate of a plasma display panel which can prevent an increase in the number of manufacturing processes and costs due to the formation of a black pattern.

Plasma Display Panel (PDP), which is one of the flat panel display devices, is composed of an array of discharge cells capable of independently discharging, and discharges each discharge cell independently according to an electrical signal applied from the outside. To reproduce the image.

The PDP can produce a total thickness of 1 cm or less, which can significantly reduce the thickness and weight of the cathode ray tube display device using an electron gun, and can secure a wider viewing angle than a liquid crystal display device. There is this.

In addition, the PDP has a structure in which a pair of glass substrates are bonded to each other through a barrier rib defining a discharge cell. In this case, a large display device can be easily manufactured by forming a wide gap between the barrier ribs. Have.

FIG. 1 is a view showing a conventional AC PDP. As illustrated, the AC PDP includes a rear substrate 1 having an address electrode 2 and a front substrate 6 having a discharge sustaining electrode 7. These are bonded to face each other, and a discharge gas (not shown) such as argon (Ar), neon (Ne), or xenon (Xe) is enclosed in the discharge space between the substrates 1 and 6.

In the above, the first dielectric layer 3 is coated on the back substrate 1 on which the plurality of address electrodes 2 are formed in a stripe shape, and the first dielectric layer 3 is adjacent to define an independent discharge space. The barrier ribs 4 for preventing crosstalk between the discharge cells are formed in the form of stripes between the address electrodes, and the phosphor 5 is coated between the barrier ribs 4.

The second dielectric layer 8 is coated on the front substrate 6 on which the discharge sustaining electrodes 7 including the transparent electrode 7a and the bus electrode 7a are arranged so that two discharge electrodes 7 are disposed for each discharge cell. A protective layer 9 made of a material such as MgO is coated on the second dielectric layer 8.

On the other hand, since PDP has a lack of sharpness compared to CRT, in order to solve this problem, when manufacturing the front substrate, the position of the same vertical line as the partition wall when bonding the adjacent discharge cells, that is, the back substrate, is usually used. The black pattern 10 in stripe form is provided in the inside.

However, the black pattern is usually formed after the discharge sustaining electrodes are formed. Since the alignment with the discharge sustaining electrode is difficult, there is a problem that contrast unevenness between discharge cells is caused due to misalignment.

In addition, since a separate process must be added to provide the black pattern, the number of manufacturing steps of the PDP is increased, as well as the manufacturing cost is increased.

Accordingly, the present invention has been made to solve the above problems, by forming a black pattern at the time of the formation of the bus electrode, while preventing misalignment with the discharge sustaining electrode while preventing an increase in the number of manufacturing processes and costs. The purpose is to provide a method for manufacturing a front substrate of the PDP that can be prevented.

1 is a cross-sectional view showing a conventional AC plasma display panel.

2A to 2D are cross-sectional views illustrating a method of manufacturing a front substrate of a plasma display panel according to an exemplary embodiment of the present invention.

3 is a plan view illustrating a front substrate of a plasma display panel according to an exemplary embodiment of the present invention.

4 is a plan view illustrating a front substrate of a plasma display panel according to another embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

11 glass substrate 12 transparent electrode

13 electrode material 14 first bus electrode

15: black pattern 15a: connection of the black patterns

16: second bus electrode 17: bus electrode

17a: electrode terminal 18: dielectric layer

Method of manufacturing a front substrate of the PDP of the present invention for achieving the above object, forming a transparent electrode on a glass substrate; Coating an electrode material having a black color on the glass substrate on which the transparent electrodes are formed; Patterning the electrode material to form a first bus electrode on each transparent electrode, and forming black patterns on portions of the glass substrate between the discharge cells; Forming a second bus electrode on the first bus electrode; And applying a dielectric layer on the result until the forming of the second bus electrode.

According to the present invention, since the black pattern is formed together at the time of forming the bus electrode, a separate process for forming the black pattern is not necessary, thereby preventing an increase in the number of manufacturing processes and manufacturing costs due to the formation of the black pattern. In addition, by forming the black pattern and the bus electrode together, the alignment between them can be made stable.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2A to 2D are cross-sectional views illustrating a method of manufacturing a front substrate of a PDP according to an embodiment of the present invention.

First, as shown in FIG. 2A, in a state in which transparent electrodes 12 made of ITO are formed on a glass substrate 11 by a known method, the transparent electrodes 12 on the glass substrate 11 are formed. Electrode material 13 is applied to the entire surface to cover the thickness.

Here, the electrode material 13 is a photosensitive Ag (silver) paste mixed with a black pigment, or is a Cr (chromium) film, in the case of the former is formed by a method of drying after full printing using a printing machine, In the latter case, it is formed by evaporation by a deposition method such as sputtering.

Next, as shown in FIG. 2B, the first bus electrode 14 is formed on the transparent electrode 12 by patterning the electrode material, and at the same time, the black pattern 15 is formed on the glass substrate between the discharge cells. To form.

Here, in forming the first bus electrode 14 and the black pattern 15, when the electrode material is a photosensitive Ag paste, the first bus electrode 14 and the black pattern 15 are formed using an exposure and development process, and the electrode material is a Cr film formed by a deposition method. In this case, after the photoresist pattern is formed on the Cr film by a known method, the Cr film is formed by etching the Cr film using the photoresist pattern as an etching mask.

Meanwhile, when the black pattern 15 is formed through the above process, the black pattern 15 and the first bus electrode 14 are formed of the same electrode material due to the black pattern 15 and the first bus electrode 14 being formed of the same electrode material. The black pattern 15 may be excited by the potential difference between the bus electrodes 14 to cause erroneous discharge. Therefore, in order to prevent such a problem, one end portions of the black patterns 15 are connected to each other to stabilize the state in which the black pattern 15 is excited during gas discharge.

Subsequently, as shown in FIG. 2C, the second bus electrode 16 made of a material having excellent conductivity is formed on the first bus electrode 14 to complete the bus electrode 17.

In this case, the second bus electrode 16 is formed to compensate for the high resistance of the first bus electrode 14. The second bus electrode 16 has a white photosensitive Ag paste formed on its entire surface. After coating, it is formed by performing exposure and development processes, or by depositing Cu (copper) and Al (aluminum), which are metals having excellent conductivity, by vapor deposition, and then performing a photolithography process.

At this time, when the second bus electrode 16 is formed by the deposition method, as many electrode layers as desired layers are formed.

In addition, when the black pattern 15 and the first and second bus electrodes 14 and 16 are formed using the photosensitive Ag paste, a firing process is performed to form the black pattern 15 and the bus electrode 17. Complete the process.

Thereafter, as illustrated in FIG. 2D, a dielectric layer 18 for accumulating charges is coated on the glass substrate 11 having the transparent electrode 12, the bus electrode 17, and the black pattern 15, and MgO. By depositing a protective film (not shown), the fabrication of the front substrate is completed.

At this time, in applying the dielectric layer 18, as shown in FIG. 3, the connecting portions 15a of the black patterns 15 are covered by the dielectric layer 18, while the bus electrode 17 is provided. A portion of the electrode terminal 17a, which is an end portion of the electrode terminal 17, is not covered by the dielectric layer 18.

As described above, when the first bus electrode 14 and the black pattern 15 are formed at the same time, a separate process for forming the black pattern 15 is not necessary, so that the formation of the black pattern 15 is performed. An increase in the number of processes and an increase in cost are not caused, and a stable alignment between the discharge sustaining electrode and the black pattern 15 can be achieved.

Meanwhile, as another embodiment of the present invention, as shown in FIG. 4, in forming the bus electrode 17 including the first and second bus electrodes, the electrode terminal 17a portion has the black patterns 15. ) Is arranged in the other side opposite to the connecting portion (15a), in this case, it is possible to prevent the risk of short with the black patterns (17) when connecting the electrode terminal (17a) and the driving circuit. .

As described above, since the present invention simultaneously forms the bus electrode and the black pattern, a separate process for forming the black pattern is not necessary, and thus an increase in the number of manufacturing processes and an increase in cost can be prevented.

In addition, by forming the bus electrode and the black pattern at the same time, it is possible to achieve a stable alignment between the black pattern and the discharge sustaining electrode, so that a uniform contrast between the discharge cells can be obtained.

In addition, since all the black patterns are connected into one, it is possible to stabilize the excited state of the black pattern, thereby improving the driving characteristics of the PDP.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (10)

Forming transparent electrodes on a glass substrate; Coating an electrode material having a black color on the glass substrate on which the transparent electrodes are formed; Patterning the electrode material to form a first bus electrode on each transparent electrode, and forming black patterns on portions of the glass substrate between the discharge cells; Forming a second bus electrode on the first bus electrode; And And applying a dielectric layer on the resultant material up to the step of forming the second bus electrode. The method of claim 1, wherein the electrode material is a photosensitive silver (Ag) paste in which black pigment is mixed. The method of claim 2, wherein the forming of the first bus electrode and the black pattern from an electrode material made of the photosensitive silver paste comprises: And forming the photosensitive silver paste by exposing and developing the photosensitive silver paste. The method of claim 1, wherein the electrode material is a chromium (Cr) film deposited by sputtering. The method of claim 4, wherein the forming of the first bus electrode and the black pattern from the electrode material made of the chromium film comprises forming a photoresist pattern on the chromium film and then using the photoresist pattern as an etching mask. A method of manufacturing a front substrate of a plasma display panel, characterized in that the film is formed by etching. The method of claim 1, wherein the forming of the second bus electrode comprises: Printing a photosensitive silver (Ag) paste having a white color on the glass substrate on which the first bus electrode is formed; And And exposing and developing the photosensitive silver (Ag) paste. The method of claim 6, wherein after forming the second bus electrode, before applying the dielectric layer, And firing the second bus electrode, the first bus electrode, and the black pattern. The method of claim 1, wherein the forming of the second bus electrode comprises: Depositing copper or aluminum metal on the glass substrate on which the first bus electrode is formed; And A method of manufacturing a front substrate of a plasma display panel comprising the step of photo-etching the metal. The method of claim 1, wherein the black patterns are formed such that one ends thereof are connected to one. 10. The method of claim 9, wherein the dielectric layer is coated to cover the connection portions of the black patterns.