KR20030013990A - Manufacturing method for pdp - Google Patents

Abstract

PURPOSE: A plasma display panel and a manufacturing method thereof are provided to improve the efficiency of discharge and phosphorescence by forming an upper and a lower of a sidewall having the same area. CONSTITUTION: A seed layer(11) is deposited on an upper portion of a lower substrate(10). An address electrode(12) is formed on an upper portion of the seed layer(11) by applying a metal on the whole upper portion of the lower substrate(10). An dielectric layer(13) is deposited on the whole upper portions of the address electrode(12) and the seed layer(11). A sidewall(14) is formed on an upper portion of the dielectric layer(13) by printing the metal through a screen print method. An upper side of the sidewall(14) is narrower than a lower side thereof. A black matrix is formed on the highest portion of the sidewall(14). A fluorescent layer is formed on a pixel area divided by the sidewall(14) by printing and firing a fluorescent.

Description

Plasma Display Panel and Manufacturing Method Thereof {MANUFACTURING METHOD FOR PDP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a method for manufacturing the same, and more particularly, to a plasma display panel and a method for manufacturing the plasma display panel adapted to increase the discharge efficiency and the luminous efficiency by changing the partition structure of the plasma display panel.

In general, a plasma display panel is a surface discharge type display device suitable for a full color matrix by phosphors, and has attracted attention as a thin display device replacing a conventional CRT.

Plasma display panels used for thin, large-color display, etc. are installed in each space by installing electrodes facing the space surrounded by the partition wall called fine discharge display cell, the back plate bonded to the lower surface of the partition wall, and the front plate on which the image is displayed. After discharging a dischargeable gas such as a rare gas, it is sealed to form an airtight structure, and plasma is generated by discharge between opposite electrodes, and vacuum ultraviolet rays generated in each plasma emit phosphors to display a screen. It is configured to be displayed. In this case, the partition wall of the conventional plasma display panel has a structure having an elongated shape in the same water direction as the area of the upper side and the lower side, and will be described in detail with reference to the accompanying drawings. same.

1 is a schematic cross-sectional view of a pixel portion of a conventional plasma display panel, and as shown therein, an underlayer 11 which is an insulating film located on an upper portion of a lower substrate 10; An address electrode 12 to which a voltage located at an upper portion of the underlayer 11 is applied; A dielectric film 13 disposed on the upper surface of the address electrode 12 and the underlying film 11; The barrier rib 14 which is in contact with the upper portion of the dielectric film 13 spaced apart from the address electrode 12 by a predetermined distance, has the same area on the upper side and the lower side, has a long shape on the upper and lower sides, and divides the pixel region. and; A black matrix (BM) positioned on an upper side of the partition wall 14; Phosphor layer positioned at a predetermined thickness on the side of the partition 14 and the upper side of the dielectric layer 13 of the pixel region divided into the partition 14, and emits visible light of each of R, G, B by the application of ultraviolet light (15); An upper substrate 20; A sustain electrode 21 which is in contact with a lower side of the upper substrate 20 and is positioned to vertically intersect the address electrode 12 in a pixel region defined by the barrier rib 14; A bus electrode 22 positioned at a lower portion of the sustain electrode 21; A dielectric film 23 positioned on the front surface of the bus electrode 22, the sustain electrode 21, and the upper substrate 20; The dielectric layer 23 may be protected, and the protective layer 24 may be disposed below the dielectric layer 23 to contact the partition 14.

Hereinafter, the structure and operation of the conventional plasma display panel as described above will be described in more detail.

First, both the upper substrate 20 and the lower substrate 10 of the conventional plasma display panel use a soda-lime silicate (SODA-LIME SILICATE) glass substrate.

An insulating film is deposited on the lower substrate 10 to form a base film 11.

Next, a metal is deposited on the upper surface of the structure, and the metal is patterned to form an address electrode 12 positioned on an upper portion of the base layer 11.

Then, a dielectric film 13 is deposited which reflects the light emitted on the upper front surface of the structure to the upper side.

Then, the upper surface of the structure is in contact with the upper portion of the dielectric film 13 facing each other spaced apart from the address electrode 12 by a predetermined distance, the area of the upper side and the lower side is the same, the upper and lower sides The partition 14 which shows the form is formed.

Next, a black matrix BM is formed on the partition 14.

Subsequently, phosphor layers 15 for generating housekeeping light representing red, green, and blue colors are formed in the pixel region divided by the partition wall 14 by application of ultraviolet rays.

At this time, the phosphor layer 15 for emitting visible light of each of R, G, and B is coated by using a screen printing method or an inkjet method, and formed through a sintering process. Each of these methods will be described in more detail.

First, in the screen printing method, the phosphor is repeatedly printed on the pixel area defined by the partition 14 by the screen printing method, dried at 120 to 150 ° C., and then baked at a temperature of 350 to 450 ° C. This is a method of forming the phosphor layer 15 through. Such a screen printing method is simple in the process, it is effective to reduce the manufacturing cost by using a low-cost equipment.

However, the thickness of the phosphor layer 15 to be printed is about 20 μm, and the thickness thereof is so thick that the size of the discharge space defined by the partition wall is reduced. That is, in order to increase the discharge efficiency, the size of the discharge space should be large, and the surface area of the exposed phosphor layer 15 should be wide. However, in the case of forming the phosphor layer 15 by the screen printing method, the thickness thereof becomes thick and relatively discharged. The size of the space is reduced, and the surface area of the phosphor layer 15 is also reduced, resulting in a decrease in discharge efficiency.

In addition, the method of printing the phosphor layer 15 by the inkjet method is a method of pressurizing the ink liquid mixed with the phosphor and the organic binder to adverb from the nozzle to print and fire the phosphor layer 15 having a desired pattern between partition walls. The characteristic of this method is that the phosphor layer 15 is accurately formed in a desired area, thereby eliminating waste of materials and using low-cost equipment, thereby reducing manufacturing costs, and reducing the thickness of the phosphor layer 15 to a thickness of 5 to 10 μm. The discharge space is larger than that of the screen printing method, and the surface area of the phosphor layer 15 is large, thereby increasing the discharge efficiency.

However, in the case of using such an inkjet method, the specific gravity is large and the particle size is about 2 to 3 μm, so that phosphors are deposited between the partition walls during drying so that they may not be evenly applied to the yarns of the partition walls 14. do. As a result, the luminous efficiency decreases due to the formation of the uncoated region.

The lower plate of the plasma display panel is manufactured by the above method.

Next, a sustain electrode 21 is formed on the upper substrate 20 so as to vertically intersect the address electrode 12 of the lower substrate, and the bus electrode 22 is formed on an upper portion of the sustain electrode 21. To form.

Next, a dielectric film 23 having excellent light transmittance is deposited on the upper surface of the structure, and a protective film 24 for protecting the dielectric film is deposited to fabricate a top plate.

Then, the upper plate and the lower plate are joined so that the protective film 24 and the partition wall 14 face each other. To form a plasma display panel.

As described above, the conventional plasma display panel and the method of manufacturing the same have a screen printing method by forming the partition wall so that the area of the upper side and the lower side are the same, and forming the phosphor layer using the screen printing method or the inkjet method. In this case, the phosphor layer is thick, so that the discharge efficiency decreases due to the reduction of the discharge space and the surface area of the phosphor layer, and in the case of using the inkjet method, particles are precipitated between the partition walls so that the phosphor layer is not evenly formed, thereby improving the luminous efficiency. There was a declining issue.

It is an object of the present invention to provide a plasma display panel and a method of manufacturing the same, which can improve discharge efficiency and luminous efficiency simultaneously.

1 is a schematic cross-sectional view of a conventional plasma display panel.

2A to 2D are cross-sectional views of a manufacturing process of the present invention plasma display panel.

Figures 3a and 3b is a cross-sectional view of the process of forming the phosphor layer in the present invention.

** Description of symbols for the main parts of the drawing **

10: bottom substrate 11: bottom film

12: address electrode 13: dielectric film

14 bulkhead 15 phosphor layer

The above object is a glass substrate; An address electrode on the glass substrate; A dielectric film located on an upper surface of the structure; A partition wall positioned at an upper portion of the dielectric layer, the barrier rib having a width of an upper side thereof gradually decreasing than a width of a lower side; Selectively applying a metal on the upper portion of the glass substrate to a lower plate structure including a phosphor layer positioned on the sidewalls of the barrier rib and the dielectric layer therebetween, thereby forming a plurality of address electrodes having an elongated shape on one side; Depositing a dielectric film that reflects light over the top surface of the structure; Printing a barrier paste for a plurality of printing processes on the top of the dielectric layer by a screen printing method to form a barrier rib having a narrower shape than a lower side thereof; The present invention is achieved by manufacturing a lower plate manufacturing method comprising printing a phosphor between the partitions using an inkjet printing method, and firing to form a phosphor layer in a pixel region divided by the partitions. When described in detail with reference to the accompanying drawings as follows.

2A to 2D are cross-sectional views illustrating a process of manufacturing a lower panel of the plasma display panel according to the present invention, and as shown therein, depositing an underlayer 11, which is an insulating layer, located on the lower substrate 10 (FIG. 2A). Wow; The metal is coated on the upper surface of the structure to form an elongated address electrode 12 on one side positioned on an upper portion of the underlying film 11, and then the address electrode 12 and the underlying film 11 are formed. Depositing a dielectric film 13 that reflects light over the top surface (FIG. 2B); A metal is printed on the dielectric layer 13 by a screen printing method through a plurality of printing processes to form a partition 14 having a narrower shape than the lower side, and a black matrix on the uppermost layer of the partition 14. Forming (BM) (FIG. 2C); A phosphor is printed between the barrier ribs 14 using an inkjet printing method, followed by baking to form the phosphor layer 15 in the pixel region divided by the barrier ribs 14 (FIG. 2D).

Hereinafter, a method of manufacturing the plasma display panel of the present invention configured as described above will be described in more detail.

First, as shown in FIG. 2A, an underlayer 11, which is an insulating film, is deposited on the lower substrate 10, which is a soda lime glass substrate. At this time, the base film 11 is used only for the AC type and not for the DC type plasma display panel.

Next, as illustrated in FIG. 2B, a metal is printed on the base layer 11 to form a plurality of address electrodes 12 having an elongate shape in one direction on an upper portion of the base layer 11.

Next, a dielectric film 13 reflecting light is deposited on the upper surface of the address electrode 12 and the underlying film 11.

Next, as shown in FIG. 2C, a partition wall 14 for dividing pixels is formed on the dielectric film 13 by screen printing.

At this time, the partition wall 14 is formed high by using a plurality of screen printing methods, and each time the number of times the screen printing method is used, the width of the printed area is narrowed so that the side is stepped, and the width thereof is gradually increased. This narrows and forms the width of the upper layer narrower than the width of the adjacent lower layer.

Next, a black matrix BM is formed on the uppermost layer of the partition 14.

When the partition 14 of such a shape is used, a sudden step change is eliminated, so that the phosphor layer can also be easily formed on the side surface of the partition 14.

Then, as shown in Fig. 2D, the phosphor layer 15 is evenly formed in the area between the partitions 14 whose width on the upper side is narrower than the width on the lower side using the inkjet printing method.

3A and 3B are cross-sectional views illustrating a process of forming the phosphor layer 15. As shown in FIG. 3, phosphor droplets 17 are applied to an area between the partitions 14 in the inkjet head 16. Referring to FIG. (Fig. 3a)

The phosphor droplets 17 applied in this way are coated on the same plane as the upper side of the partition 14.

The phosphor droplet 17 uses an inorganic pigment containing BaMgAl ₁₀ O ₁₇ : Eu as a material showing blue color, and an inorganic pigment containing (Y.Gd) Bo ₃ : Eu and a BaAl as a material indicating green color. Inorganic pigments containing ₁₂ O ₁₉ : Mn or ZnSiO ₄ : Mn are used.

After coating the phosphor droplets 17 and firing, the organic binder and the solvent contained in the phosphor droplets 17 are burned and volatilized to be removed, and only the phosphors remain to form the phosphor layer 15. (Fig. 3b)

The particles of the phosphor have a size of about 2 ~ 3㎛, the phosphor particles are precipitated as the organic binder and the solvent is volatilized to form a phosphor layer 15 of 5 ~ 10㎛ thickness.

Conventionally, while the phosphor particles are precipitated, the phosphor particles are not formed evenly on the side portion of the side wall, but as the present invention is deposited using the side wall 14 gradually increasing in width toward the lower side. By preventing the phosphor particles from being deposited on top of the dielectric film 13 and remaining on the side surfaces of the sidewalls 14, the phosphor layer 15 having an even distribution can be formed.

In addition, since the side surfaces of the sidewalls 14 are formed to be inclined, the discharge efficiency can be improved by increasing the surface area of the phosphor layer 15 to be applied.

As described above, the plasma display panel of the present invention and a method of manufacturing the same have a multi-layered structure in which the width of the partition that separates the pixels of the plasma display panel decreases as the upper layer is formed, and a phosphor layer is formed between the regions by inkjet printing. Thus, the thinner phosphor layer is formed evenly to prevent the reduction of the discharge space, the surface area of the phosphor layer is prevented from being reduced, thereby improving the discharge efficiency, and the phosphor layer is evenly distributed to increase the luminous efficiency. .

Claims (5)

Glass substrates; An address electrode on the glass substrate; A dielectric film located on an upper surface of the structure; A partition wall positioned at an upper portion of the dielectric layer, the barrier rib having a width of an upper side thereof gradually decreasing than a width of a lower side; And a phosphor layer positioned on the sidewalls of the barrier ribs and the dielectric film therebetween. The plasma display panel of claim 1, wherein the barrier ribs are sequentially stacked with a plurality of structures having mutually different widths so that their side portions have a stepped structure. Selectively applying a metal to the upper portion of the glass substrate to form a plurality of address electrodes elongated to one side; Depositing a dielectric film that reflects light over the top surface of the structure; Printing a barrier paste for a plurality of printing processes on the top of the dielectric layer by a screen printing method to form a barrier rib having a narrower shape than a lower side thereof; And printing a phosphor between the partition walls using an inkjet printing method, and baking the same to form a phosphor layer in a pixel region divided by the partition walls. The method of claim 3, wherein the forming of the partition wall is performed by using a screen printing method, and as the printing process proceeds, the width of the printing area is reduced, the width of the uppermost layer is the narrowest, the width of the lowermost part is wide, and the side part thereof. A plasma display panel manufacturing method characterized by forming a partition wall having a step shape. 4. The method of claim 3, wherein the forming of the phosphor layer comprises: applying a phosphor droplet to an area between the partition walls using an inkjet head; Firing to volatilize the volatile components of the applied phosphor droplets to precipitate only the phosphors to form a phosphor layer.