KR20060062995A - Manufacturing method of plasma display panel - Google Patents

Abstract

The present invention relates to a method of manufacturing a plasma display panel.

The method of manufacturing a plasma display panel according to the present invention includes a front panel in which a plurality of storage electrode pairs are formed by pairing a scan electrode and a sustain electrode on a front glass, and a plurality of address electrodes are intersected with the plurality of storage electrode pairs. In the method of manufacturing a plasma display panel comprising a phosphor layer disposed between the rear panel arranged on the rear glass, the front panel and the rear panel at regular intervals to partition the R, G, B subpixels. A phosphor powder, a binder, and a solvent are mixed to form a phosphor paste having a viscosity of 25,000 cPs or more and 30,000 cPs or less.

Therefore, the present invention has the effect of reducing the manufacturing cost by preventing the spreading of the paste by changing the composition of the phosphor paste when forming the phosphor layer of the plasma display panel to prevent mixing.

Description

Manufacturing method of plasma display panel {Manufacturing Method of Plasma Display Panel}

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

2 illustrates a dispensing apparatus for forming a phosphor layer of a conventional plasma display panel.

3 is a block diagram sequentially illustrating a method of manufacturing a plasma display panel according to the present invention;

4 is a view sequentially showing a method of manufacturing a phosphor paste of a plasma display panel according to the present invention;

The present invention relates to a plasma display panel, and more particularly, to a phosphor layer of a plasma display panel.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He). 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.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. A rear panel 110 having a plurality of address electrodes 113 arranged so as to intersect the plurality of sustain electrode pairs on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is a bus made of a scan material 102 and a sustain electrode 103, that is, a transparent electrode a made of a transparent material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the electrodes b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by a dielectric layer 104 which limits the discharge current and insulates the electrode pairs, and the upper surface of the upper dielectric layer 104 is magnesium oxide to facilitate the discharge conditions. A protective layer 105 on which (MgO) is deposited is formed.

The rear panel 110 is arranged such that a plurality of discharge spaces, that is, stripe-type partitions 112 for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 which perform address discharge to generate vacuum ultraviolet rays are arranged parallel to the partition wall 112. On the upper side of the rear panel 110, R, G, and B phosphors 114 which emit visible light for image display during address discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

In such a plasma display panel, the phosphor layer of the rear panel is formed by screen printing or using a dispensing device.

Referring to the method of forming the phosphor layer of the plasma display panel using the screen printing method, first, a phosphor paste is prepared, and the phosphor paste is printed a plurality of times between partition walls using a mask.

As a result, a phosphor showing a specific color of red, green, and blue is printed on each pixel area, and the light-emitting layer is repeated several times to form a phosphor layer having a suitable thickness and uniformity. In other words, printing is performed on all of the red pixel pastes at the same time using the red phosphor paste, and then the mask is changed again to print the green phosphor paste, and finally, the blue phosphor paste is replaced with the mask.

Between such a printing process includes a step of drying at a temperature of 100 ℃ ~ 150 ℃ or less, if all the phosphors are printed through the above-described process, by firing at a temperature of 350 ℃ ~ 500 ℃ to form a phosphor layer.

However, the method of forming the phosphor layer between the partition walls by the screen printing method has the advantage of using low-cost equipment, but the mask may be clogged by the phosphor paste, thereby reducing the reliability of the process.                         

In addition, it is not easy to precisely adjust the thickness of the phosphor layer to be printed, there is a problem that may be caused by the wear of the squeegee for printing the paste through a mask may increase the manufacturing cost.

Due to the problem of the screen printing method, a phosphor layer is formed using a dispensing apparatus. First, the dispensing apparatus will be described with reference to FIG. 2.

2 illustrates a dispensing apparatus for forming a phosphor layer of a conventional plasma display panel.

As shown in FIG. 2, the dispensing apparatus includes a server 210, a pressure pump 220, a header 230, and the like, and the phosphor paste 250 supplied from the server 210 includes a subsidiary pump 220. By the pressurized to the header 230 is supplied.

First, the paste chamber 230a and the nozzle 240 are provided in the header 230, and the phosphor paste 250 pressurized and supplied to the paste chamber 230a is continuously discharged from the nozzle 240. At this time, it is preferable that the nozzle 240 be less than or equal to the distance d between the partitions 109 in order to prevent a collision with the partitions 109 during application.

Although not shown, the header 230 is configured to be linearly driven by the header scanning mechanism, and the rear panel 102 is scanned by continuously discharging the phosphor paste 250 from the nozzle 240 while simultaneously scanning the header 230. The phosphor paste is uniformly applied between the partition walls 109 on the ().

After applying the phosphor paste in this manner, the phosphor layer is formed by baking at a temperature of 350 ° C to 500 ° C.                         

However, if the phosphor layer using the dispensing device is formed, the problem of the screen printing method can be solved. However, if the viscosity of the phosphor paste formed using the dispensing device is too high, it may cause clogging to the nozzle, and stable spraying may be achieved. This prevents the phosphor layer from being applied as desired.

In addition, when the viscosity is low, there is a problem in that the spread of the phosphor paste formed on the partition wall increases and flows into neighboring cells, causing mixing.

In order to solve this problem, an object of the present invention is to provide a plasma display panel which can prevent the color mixture caused by the spread of the paste by improving the phosphor paste composition of the plasma display panel.

Method for manufacturing a plasma display panel according to the present invention for achieving the above object is a front panel arranged with a plurality of storage electrode pairs formed by pairing a scan electrode and a sustain electrode on the front glass, the direction crossing the plurality of storage electrode pairs A method of manufacturing a plasma display panel including a phosphor layer between a rear panel having a plurality of address electrodes arranged on a rear glass, a front panel and a rear panel at regular intervals, and partitioning partitions for R, G, and B subpixels. In the phosphor layer, a phosphor powder, a binder and a solvent are mixed to form a phosphor paste having a viscosity of 25,000 cPs or more and 30,000 cPs or less.

The composition ratio of the phosphor powder It is characterized in that less than 36wt% or more and less than 48wt% relative to the whole phosphor paste.

The binder is EC (Ethyl Cellulose) series, the composition ratio is characterized in that more than 8wt% or less than 10wt% with respect to the whole phosphor paste.

The solvent includes at least one of BC (Butyl Carbitol) or BCA (Butyl Carbitol Acetate), and the composition ratio of the solvent is 44 wt% or more and 54 wt% or less with respect to the entire phosphor paste.

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

3 is a block diagram sequentially illustrating a method of manufacturing a plasma display panel according to the present invention.

As shown in FIG. 3, the manufacturing method of the plasma display panel according to the present invention includes an assembly process including a front panel manufacturing process listed on the right side of FIG. 3, a rear panel manufacturing process listed on the left side, and a sealing process listed below. do.

First, the manufacturing process of the front panel listed on the right side of FIG. 3 is as follows. The front panel first prepares the front glass to be a substrate (100), and then a plurality of sustain electrode pairs are formed on the front glass (110). Thereafter, an upper dielectric layer is formed on the sustain electrode pair 120, and a protective layer made of magnesium oxide (MgO) is formed on the upper dielectric layer 130 to protect the sustain electrode pair.

Next, the manufacturing process of the rear panel listed on the left side of FIG. 3 will be described. Like the front panel, the rear panel is prepared with a rear glass, which is a base material (200), and a plurality of address electrodes are formed on the rear glass so as to face and cross the sustain electrode pair formed on the front panel (210). Thereafter, a lower dielectric layer is formed on the upper surface of the address electrode (220), and a phosphor layer is formed on the upper dielectric layer (230).

The front panel and the rear panel manufactured as described above are sealed to each other to form a plasma display panel 400.

On the other hand, in the above-described method for manufacturing a plasma display panel of the present invention, the phosphor paste for forming the phosphor layer is mixed with a phosphor powder, a binder and a solvent. Looking at the phosphor paste manufacturing method as shown in FIG.

4 is a diagram sequentially illustrating a method of manufacturing a phosphor paste of a plasma display panel according to the present invention.

First, the binder (Binder) and the solvent (Solvent) are mixed by using a planetary mixer (Planetary Mixer) (400). At this time, the binder is composed of EC (Ethyl Cellulose) series, the composition ratio is 8wt% or more and 10wt% or less with respect to the entire phosphor paste. EC (Ethyl Cellulose) series constituting such a binder is cheaper than PPC (Poly Propylene Carbonate) used as a conventional binder to reduce the cost of phosphor paste manufacturing.

In addition, the solvent may be composed of Butyl Carbitol (BC) or Butyl Carbitol Acetate (BCA), and may also be comprised of Butyl Carbitol (BC) and Butyl Carbitol Acetate (BCA). At this time, by using BC (Butyl Carbitol) as a solvent, the price is lower than that of the conventional PC (Propylene Carbonate) used as a solvent to reduce the cost of the phosphor paste manufacturing. Such a solvent has a composition ratio of 44 wt% or more and 54 wt% or less with respect to the entire phosphor paste.

After the binder and the solvent are mixed, the phosphor paste is prepared by mixing the mixed binder, the solvent and the phosphor powder using a planetary mixer (410). At this time, the phosphor powder has a composition ratio of 36 wt% or more and 48 wt% or less with respect to the entire phosphor paste.

After preparing the phosphor paste, the viscosity characteristic of the paste is evaluated (420). At this time, the viscosity of the measured phosphor paste is 25,000 cPs or more and 30,000 cPs or less, which is a phenomenon caused by an increase in the content of the phosphor powder. As the viscosity increases, the spreading width decreases, but the dispersion is not good or the flowability becomes small. This problem can be solved by appropriately adjusting the content of the binder when mixing the phosphor paste. At this time, in case of failing to control the content of the binder, the binder and the solvent must be combined to prepare a phosphor paste.

After the viscosity characteristic evaluation is finished, a phosphor paste is applied using a dispensing apparatus to form a phosphor layer (430).

By forming the phosphor by improving the composition of the phosphor paste thus formed, it is possible not only to reduce the phosphor paste manufacturing cost but also to improve the spread of the phosphor paste, thereby preventing mixing of the phosphor.

As described above, the technical configuration of the present invention will 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 their All changes or modifications derived from equivalent concepts should be construed as being included in the scope of the present invention.

As described above, the present invention has the effect of improving the composition of the phosphor paste when forming the phosphor layer of the plasma display panel to reduce the manufacturing cost and to prevent the spread of the paste to prevent color mixing.

Claims (4)

A front panel having a plurality of sustain electrode pairs formed by pairing a scan electrode and a sustain electrode on the front glass; a rear panel having a plurality of address electrodes arranged on the rear glass in a direction crossing the plurality of sustain electrode pairs; In a method of manufacturing a plasma display panel comprising a phosphor layer disposed between the rear panel and the rear panel at regular intervals to partition R, G, and B subpixels. Wherein the phosphor layer is formed by dispersing a phosphor paste having a viscosity of 25,000 cPs or more and 30,000 cPs or less by mixing a phosphor powder, a binder, and a solvent. The method of claim 1, The composition ratio of the phosphor powder is A plasma display panel manufacturing method, characterized in that the total phosphor paste is 36wt% or more and 48wt% or less. The method of claim 1, The binder is EC (Ethyl Cellulose) series, the composition ratio of the plasma display panel, characterized in that more than 8wt% or less than 10wt% with respect to the entire phosphor paste. The method of claim 1, The solvent includes at least one of Butyl Carbitol (BC) or Butyl Carbitol Acetate (BCA), The composition ratio of the solvent is a plasma display panel manufacturing method, characterized in that 44wt% or more and 54wt% or less with respect to the whole phosphor paste.

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