KR100662455B1 - Green sheet for dielectric of plasma display panel and manufacturing method using the same - Google Patents

Abstract

A green sheet for a dielectric of a plasma display panel and a manufacturing method using the same are provided to control the thickness of the dielectric and improve uniformity of the dielectric by forming a green sheet with a plurality of layers. A first dry film(210) is formed on an upper surface of a base film(240). A second dry film(220) is formed on an upper surface of the first dry film. A photoresist(230) is formed on an upper surface of the second dry film. A cover film(200) is formed on an upper surface of the photoresist. The first dry film includes dielectric powder, a high molecular organic material insoluble to a developer, a dispersing agent, and a plasticizer. The second dry film includes the dielectric powder, a high molecular organic material soluble to the developer, the dispersing agent, and the plasticizer.

Description

Green sheet for dielectric of plasma display panel and manufacturing method using the same}

1 is a view showing the structure of a typical plasma display panel.

2 illustrates a green sheet for a dielectric of a plasma display panel according to the present invention;

3 is a view showing the structure of a plasma display panel according to the present invention;

4a to 4f sequentially illustrate a method of manufacturing a front substrate of a plasma display panel according to the present invention.

<Description of the symbols for the main parts of the drawings>

200: cover film 210: first dry film

220: second dry film `230: photoresist

240: base film

The present invention relates to a plasma display panel, and more particularly, to a green sheet for a dielectric of a plasma display panel capable of easily forming a differential dielectric and a method of manufacturing a plasma display panel using the same.

The most widely used display device device to date is a cathode ray tube (CRT). However, the CRT has a problem in that as the display area is widened, the weight becomes heavier and the volume becomes considerably larger. Therefore, recently, flat panel display devices are being developed to solve such shortcomings of the CRT and lead the next generation display industry.

As a result, research and investment in liquid crystal displays (LCDs), plasma display panels (PDPs), field emission devices (FEDs), and the like, are being actively conducted. In addition, electro-cromic displays using electrochemical properties and suspended particle displays (SPD) using dispersed particles have also been studied as promising flat panel display devices.

Particularly, in the plasma display panel, a partition wall formed between the front substrate and the rear substrate forms one unit cell, and in each cell, neon, helium, or a mixture of neon and helium (ne + he) is used. An inert gas containing a main discharge gas such as and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration. Looking at the structure of such a plasma display panel in detail as follows.

1 illustrates a structure of a general plasma display panel.

As illustrated in FIG. 1, the front substrate includes a sustain electrode formed by pairing a scan electrode 101 and a sustain electrode 102 formed of a transparent electrode and a bus electrode on the front glass 100, and the scan electrode 101. ) And a dielectric layer 103 is formed on the sustain electrode 102 to limit the discharge current and to insulate the electrode pairs. A protective layer 104 made of magnesium oxide (MgO) is formed on the dielectric layer 103 to form a front substrate.

On the rear substrate, an address electrode 111 arranged on the rear glass 110 is formed to intersect the scan electrode 101 and the sustain electrode 102 of the front substrate, and the white back 112 is formed on the address electrode 111. Is formed. A partition wall 113 is formed on the white bag 112 to form a unit discharge cell. R, G, and B phosphors are coated between the partition walls 113 to form a phosphor layer 114.

In the conventional plasma display panel, the dielectric layer 103 formed on the front substrate forms a wall charge to maintain the discharge by the discharge sustain voltage, protects the electrode from ion impact during the discharge of the plasma, and prevents the diffusion film. In addition to playing a role, it also serves as the foundation layer for the shield.

If the dielectric layer 103 is formed differentially by forming grooves or protrusions in the dielectric layer having such a role, the discharge efficiency of the plasma display panel may be further improved.

The differential dielectric layer is formed through a plurality of dielectric pastes printed on the front glass on which the scan electrodes 101 and the sustain electrodes 102 are formed, and then subjected to exposure and development processes.

However, when the differential dielectric layer is formed in the above manner, the dielectric film characteristics are not good, and the number of manufacturing processes for forming the differential dielectric layer is increased and the manufacturing time is long.

Accordingly, an object of the present invention is to provide a dielectric green sheet of a plasma display panel and a method of manufacturing a plasma display panel using the same, which can simplify a manufacturing process for forming a differential dielectric layer by improving a dielectric green sheet.

In order to achieve the above object, the first dry film and the green sheet formed on the dielectric layer of the plasma display panel of the present invention, the base film, the base fill the second dry film formed on the first dry film, the second dry It includes a photoresist formed on the film and a cover film formed on the photoresist.

The first dry film is characterized in that it comprises a dielectric powder, a polymer organic material that is not dissolved in the developer, a dispersant, a plasticizer.

The second dry film is characterized in that it comprises a dielectric powder, a polymer organic material that can be dissolved in a developer, a dispersant, a plasticizer.

The polymer binder that can be dissolved in the developer is characterized in that the acrylic series.

The photoresist is characterized in that it is composed of a negative photosensitive organic material.

In addition, a method of manufacturing a plasma display panel using a dielectric green sheet of the plasma display panel may include forming a scan electrode and a sustain electrode on a glass, and including the glass and a dielectric green on the scan electrode and the sustain electrode. Laminating a sheet, placing a photo mask having a predetermined pattern formed thereon on the dielectric green sheet, exposing the photomask, and applying a predetermined developer to form a dielectric layer; and forming a protective layer on the dielectric layer. do.

The dielectric green sheet may include a first dry film, a second dry film, and a photoresist from which the base film and the cover film are removed.

The dielectric layer is formed of a first dielectric layer and a second dielectric layer.

The first dry film is characterized by forming a first dielectric layer.

The second dry film is characterized by forming a second dielectric layer.

In the second dry film, a groove is formed in a portion corresponding to between the scan electrode and the sustain electrode.

The developer is characterized in that any one of an aqueous alkali solution, water.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a view showing a green sheet for a dielectric of a plasma display panel according to the present invention.

As shown in FIG. 2, the dielectric green sheet of the plasma display panel according to the present invention has a cover film 200 and a first dielectric dry film 210 formed on the cover film 200. The first dielectric dry film is composed of a dielectric powder, a polymer organic material, a dispersant, and a plasticizer that are not dissolved in a developer during development regardless of exposure. The second dielectric dry film 220 is formed on the first dielectric dry film 210, and the second dielectric dry film 220 may be a dielectric powder or a polymer organic material that may be dissolved in a developer during development regardless of exposure. , Dispersant and plasticizer. At this time, it is preferable that the high molecular organic substance which can be dissolved in a developing solution is acrylic. The photoresist 230 formed of a negative photosensitive organic material is formed on the second dielectric dry film 220, and the base film 240 is formed on the photoresist 230.

Here, the reason why the second dielectric dry film 220 uses the polymer organic material that can be dissolved in the developer, unlike the first dielectric dry film 210, is due to the thickness of the dielectric layer of the plasma display panel, the discharge efficiency of the plasma display panel, and the discharge. This is because of the correlation of the starting voltage. As the present invention, the first dielectric dry film 210 and the second dielectric dry film 220 form a first dielectric layer and a second dielectric layer, respectively, to form a dielectric layer having two layers. It becomes thicker than conventional. Although the thickness of the dielectric layer is increased, the discharge efficiency of the plasma display panel is improved, but there is a problem that the discharge start voltage is increased. Therefore, in the present invention, the second dry film 220 constituting the second dielectric layer is formed of a polymer organic material that can be dissolved in a developer during development to form a second dielectric layer differentially to lower the discharge start voltage.

The dielectric green sheet of the plasma display panel according to the present invention is subjected to the following manufacturing process.

First, after forming the photoresist 230 to a predetermined thickness on the PET film formed on the conveyor belt with a predetermined thickness, there is a polymer organic material, dielectric powder, dispersant, plasticizer that can be dissolved in the developing solution therein After the second slurry is applied to the photoresist 230 with a predetermined thickness in the coater including the mixed second slurry, the second slurry is formed as the second dry film 220 after passing through the drying zone.

Thereafter, the first slurry is coated on the second dry film 220 in a coater including a first slurry in which a polymer organic material and a dielectric powder, a dispersant, and a plasticizer are mixed, which are not dissolved in the developer during development. After passing through the drying zone, the first slurry is formed of the first dry film 210. When the cover film 200 is formed on the upper part of the first dry film 210 formed as described above, the green sheet for dielectric of the plasma display panel according to the present invention is formed.

Looking at the structure of the plasma display panel according to the present invention formed by using the dielectric green sheet as follows.

3 is a view showing the structure of a plasma display panel according to the present invention.

As shown in FIG. 3, in the front substrate of the plasma display panel according to the present invention, a pair of scan electrodes 301 and sustain electrodes 302 formed of a transparent electrode and a bus electrode is formed on the front glass 300 as a substrate. A sustain electrode is formed. A first dielectric layer 303 is formed on the scan electrode 301 and the sustain electrode 302, and a portion corresponding to the scan electrode 301 and the sustain electrode 302 is formed on the first dielectric layer 303. The second dielectric layer 304 in which the groove G is formed is formed. A protective layer 305 made of magnesium oxide (MgO) is formed on the second dielectric layer 304 formed as described above.

Next, looking at the rear substrate, an address electrode 311 arranged to intersect the scan electrode 301 and the sustain electrode 302 of the front substrate is formed on the rear glass 310, and the upper portion of the address electrode 311. White back 312 is formed. A partition 313 partitioning the unit discharge cells is formed on the white back 312, and R, G, and B phosphors are coated in the discharge cells partitioned by the partition 313 to form a phosphor layer 314. .

In the plasma display panel having such a structure, a process of forming the front substrate using the green sheet for dielectric of the plasma display panel according to the present invention will be described as follows.

4A to 4F are diagrams sequentially illustrating a method of manufacturing a front substrate of a plasma display panel according to the present invention.

First, as shown in FIG. 4A, a scan electrode 401 and a sustain electrode 402 formed of a transparent electrode and a bus electrode are formed on the front glass 400.

An example of a method of forming the scan electrode and the sustain electrode is a photo mask in which a predetermined pattern is formed by laminating a dry film on a transparent electrode film formed of an indium tin oxide (ITO) material made of indium oxide and tin oxide. After exposing in a pattern of), the developing and etching processes form a transparent electrode for a scan electrode and a transparent electrode for a sustain electrode.

The photosensitive silver (Ag) paste is printed on the upper portion of the transparent electrode for the scan electrode and the sustain electrode thus formed by the screen-printing method, followed by an exposure process using a pattern of a photo mask, followed by development and etching. When firing through the process, the scan electrode 401 and the sustain electrode 402 are formed.

Thereafter, as shown in FIG. 4B, the cover film of the dielectric green sheet 403 of the plasma display panel according to the present invention is disposed on the front glass 400 on which the scan electrode 401 and the sustain electrode 402 are formed. 4) after laminating the first dielectric dry film 403a, the second dielectric dry film 403b, the photoresist 403c, and the base film 403d, using the roller 404, as shown in FIG. 4C. As described above, the base film 403d is removed. When laminating the dielectric green sheet 403, the dielectric green sheet 403 is pushed to the edge of the electrode, and the front glass 400 having the scan electrode 401 and the sustain electrode 402 pattern formed thereon. The empty space between the green sheet 403 and the dielectric should not be generated.

Thereafter, as shown in FIG. 4D, the photomask 405 having a predetermined pattern is formed on the photoresist 403c and exposed, and as shown in FIG. 4E, when developed, the photoresist having a predetermined pattern ( 403c) is formed. At this time, the photoresist 403c is composed of a negative photosensitive organic material.

Thereafter, as shown in FIG. 4F, after developing the second dry film 403b with a developing solution for developing, grooves are formed in the second dry film 403b when the photoresist 403c is peeled off. When the front glass 400 including the second dry film 403b formed as described above is fired, a first dielectric layer and a second dielectric layer are formed. Here, the first dry film 403a forms a first dielectric layer formed on the scan electrode 401 and the sustain electrode 402, and the grooved second dry film 403b forms a second dielectric layer. Thus, a dielectric layer formed of two layers is completed. At this time, the developing solution for developing the second dry film 403b is either alkaline aqueous solution or water.

When a protective layer (not shown) made of magnesium oxide (MgO) is formed on the dielectric layer formed using the CVD method or the ion plating method, the front substrate of the plasma display panel according to the present invention is completed.

By improving the green sheet for the dielectric as described above, it is possible to easily form the differential dielectric which can improve the discharge efficiency, and the time of the manufacturing process can be reduced.

In addition, the thickness control of the dielectric layer and the uniformity of the dielectric layer can be improved.

As described above, the technical configuration of the present invention can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As can be seen from the above, the present invention has the effect of forming the dielectric green sheet into a plurality of layers to control the thickness of the dielectric layer and improve the uniformity of the dielectric layer.

In addition, by varying the composition of each layer of the green sheet constituting the dielectric layer, it is possible to easily form a differential dielectric layer that can improve the discharge efficiency, it is possible to reduce the time of the manufacturing process for forming the differential dielectric layer.

Claims (12)

Base film; A first dry film formed on the base film; A second dry film formed on the first dry film; A photoresist formed on the second dry film; And A cover film formed on the photoresist; Green sheet for the dielectric of the plasma display panel comprising a. The method of claim 1, The first dry film may include a dielectric powder, a polymer organic material that is not dissolved in a developer, a dispersant, and a plasticizer. The method of claim 1, The second dry film includes a dielectric powder, a polymer organic material that can be dissolved in a developer, a dispersant, and a plasticizer. The method of claim 3, wherein The polymer binder soluble in the developer is an acrylic green sheet for a plasma display panel, characterized in that the acrylic series. The method of claim 1, The photoresist is a green sheet for a dielectric of a plasma display panel, characterized in that the composition is composed of a negative photosensitive organic material. Forming a scan electrode and a sustain electrode on the glass; Laminating a green sheet for dielectric on the scan electrode and the sustain electrode including the glass; Placing a photomask having a predetermined pattern formed thereon on the dielectric green sheet and exposing the photomask to form a dielectric layer by applying a predetermined developer; And Forming a protective layer over the dielectric layer; Method of manufacturing a plasma display panel comprising a. The method of claim 6, The dielectric green sheet may include a first dry film, a second dry film, and a photoresist from which the base film and the cover film are removed. The method of claim 6, And the dielectric layer is formed of a first dielectric layer and a second dielectric layer. The method according to claim 7 or 8, And the first dry film forms a first dielectric layer. The method according to claim 7 or 8, And said second dry film forms a second dielectric layer. The method of claim 7, wherein And a groove is formed in the second dry film at a portion corresponding to between the scan electrode and the sustain electrode. The method of claim 6, The developer is a method of manufacturing a plasma display panel, characterized in that any one of an aqueous alkali solution, water.

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