KR20060082759A - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel.

The plasma display panel according to the first exemplary embodiment of the present invention includes a discharge cell partitioned by a row barrier rib and a column barrier rib and a phosphor coated on the discharge cell, wherein the upper width of the row barrier rib is It is characterized in that it is narrower than the upper width of the column partition.

In addition, the plasma display panel according to the second embodiment of the present invention includes a discharge cell partitioned by a row barrier and a column barrier, and a phosphor coated on the discharge cell, wherein an upper portion of the row barrier is It is characterized by having a round shape in the partition height direction.

Description

Plasma Display Panel

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

2 is a view for explaining a process of forming a phosphor layer of a conventional plasma display panel using a dispensing apparatus.

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

4 is a diagram illustrating a partition structure of a plasma display panel according to a second embodiment of the present invention.

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

200: rear glass 210: partition paste

211: dry film resin 212: photo mask

213: sandblasting device 210a: low partition

210b: column bulkhead

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of preventing mixed color generation when phosphors are applied by changing a structure of a partition wall formed in the 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 provided with the electrode b and the sustain electrode 103 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 in parallel with 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.

Meanwhile, in the above-described structure of the plasma display panel, the phosphor layer of the rear panel is formed through screen printing using a mask or dispensing using a dispensing apparatus.

Referring to a method of forming a phosphor layer of a plasma display panel using a screen printing method, first, a phosphor paste is prepared, and a 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 printing process includes a step of drying at a temperature of 100 ℃ or more and 150 ℃ or less, if all the phosphors are printed through the above-described process, the phosphor layer is formed by firing at a temperature of 350 ℃ or more and 500 ℃ or less.

However, the method of forming the phosphor layer between the partition walls using the screen printing method has the advantage of using inexpensive 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 occur due to 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, recently, a phosphor layer is formed through a dispensing method using a dispensing apparatus, which is one of direct patterning methods.

2 is a view for explaining a process of forming a phosphor layer of a conventional plasma display panel using a dispensing apparatus.

As shown, the dispensing apparatus is provided with a server 210, a pressure pump 220, a header 230, etc., the phosphor slurry 250 supplied from the server 210 is a subscription pump 220 By the pressurized to the header 230 is supplied.

First, the slurry chamber 230a and the nozzle 240 are provided in the header 230, and the phosphor slurry 250 pressurized and supplied to the slurry chamber 230a is continuously discharged from the nozzle 240. .

Although not shown, the header 230 is configured to be linearly driven by the header scanning mechanism, and the rear panel 110 is scanned by continuously discharging the phosphor slurry 250 from the nozzle 240 while simultaneously scanning the header 230. The phosphor slurry is uniformly applied between the partition walls 112. Subsequently, firing at a temperature of 350 ° C. or higher and 500 ° C. or lower forms a phosphor layer.

As described above, when the phosphor layer is formed by using the dispensing apparatus, the phosphor slurry is uniformly applied between the partition walls, but the viscosity characteristic of the phosphor slurry is generally higher than that of the phosphor paste used when forming the phosphor layer by screen printing. Lower. The viscosity characteristic of the phosphor slurry has a problem of causing mixing of the phosphor formed in the discharge cell. That is, when dispensing a low-viscosity phosphor slurry between partition walls, the phosphor slurry should be formed only in a desired discharge cell, but flows into an undesired neighboring discharge cell due to the high spreadability of the slurry, causing a mixture of phosphors.

In particular, such phosphor mixing occurs easily due to misalignment between the dispensing device and the partition wall formed in the panel.

In addition, the phosphor mixture color generation easily occurs according to the discharge cell structure when discharging the phosphor slurry, that is, when the structure of the barrier rib is a closed type including a row barrier rib and a column barrier rib. This is because, during slurry dispensing, the phosphor slurry flows over the upper row partition wall of the closed type partition walls and forms an unwanted phosphor in another discharge cell. Here, the low barrier ribs are barrier ribs for dividing into one unit pixel in a discharge space in which phosphors of the same color, for example, only R phosphors, only G phosphors or only B phosphors are applied, and the column barriers are R, Means a partition for separating each of the R, G, B phosphors in the discharge space coated with the G, B phosphors to divide into unit pixels.

On the other hand, when the phosphor layer is formed using a dispensing apparatus, it is possible to increase the viscosity of the phosphor slurry to prevent color mixing, but if the viscosity is too high, it may cause clogging to the nozzle of the dispensing apparatus and the desired spray may not be performed. As a result, there is a problem in that the phosphor slurry cannot be applied.

In order to solve this problem, the present invention improves the partition structure of the plasma display panel to provide a plasma display panel that can prevent the occurrence of mixed color irrespective of the alignment characteristics between the dispensing device and the partition and the viscosity characteristics of the phosphor slurry. The purpose is.

A plasma display panel according to a first embodiment of the present invention for achieving the above object comprises a discharge cell partitioned into a row partition and a column partition and a phosphor coated on the discharge cell, The upper width is narrower than the upper width of the column partition.

The upper width of the row partition wall is characterized in that more than 20% to 50% of the width of the upper column partition wall.

The upper width of the row partition wall is characterized in that more than 10㎛ 100㎛.

A plasma display panel according to a second embodiment of the present invention includes a discharge cell partitioned into a row barrier rib and a column barrier rib and a phosphor coated on the discharge cell, and an upper portion of the row barrier rib is formed in a row barrier height direction. It is characterized by having a round shape.

The round shape on the upper row partition wall is characterized in that formed by heating.

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

First, although not shown in the drawings, the plasma display panel according to the present invention is formed by bonding a front panel, which is a display surface on which an image is displayed, and a rear panel constituting a rear surface at a predetermined interval, as in the related art.

The front panel includes a sustain electrode formed by pairing a scan electrode and a sustain electrode on the front glass, and an upper dielectric layer is stacked on the front glass where the scan electrode and the sustain electrode are arranged in parallel to limit the discharge current. In addition, the upper dielectric layer is formed with a protective layer in which magnesium oxide (MgO) is deposited to prevent damage to the upper dielectric layer and to increase emission efficiency of secondary electrons by sputtering generated during plasma discharge.

The rear panel is provided with an address electrode in a direction crossing the sustain electrodes arranged in parallel with the upper part of the upper glass, and a lower dielectric layer is formed on the address electrode to accumulate wall charges. In addition, a partition wall is formed on the lower dielectric layer to partition a discharge cell, and a fluorescent layer is applied to the discharge cell space, so that visible light having any one of R (red), G (green), and B (blue) color is discharged. Will occur.

In the plasma display panel having the structure as described above, the structure of the partition wall for dividing the discharge cells is as follows.

<Bulk wall structure according to the first embodiment>

3 illustrates a partition structure of a plasma display panel according to a first embodiment of the present invention. As shown, the row partition 210a and the column partition 210b are stacked and formed in a closed type to define a discharge cell, and the upper width of the row partition 210a is greater than the upper width of the column partition. It is narrowly formed. That is, the row partition wall forms a tapered shape in the partition height direction. In this case, the upper width W2 of the row partition wall 210a is preferably formed to be 20% or more and 50% or less with respect to the upper width W1 of the column partition wall 210b. This takes into account the mechanical strength of the partition wall and spreadability when the phosphor slurry is applied to the discharge cells. That is, when the upper width W2 of the row partition is less than 20% of the width W1 of the upper part of the column partition, the mechanical strength of the partition decreases and there is a risk of collapse, and the upper width W2 of the row partition is If the width is formed over 50% of the width W1 of the column partition wall, the phosphor is not applied only to a desired discharge cell in the method of manufacturing a plasma display panel, and sufficient color mixing of phosphors generated by flowing into neighboring discharge cells cannot be prevented. Because.

In addition, the numerical value for the upper width of the row partition wall is preferably 10㎛ more than 100㎛. Numerical values for the upper width of the row partitions also take into account the mechanical strength of the partition walls as described above and the spreadability of the phosphor slurry on the discharge cells.

Plasma display panel according to the present invention having such a partition structure is more smoothly compared to the plasma display panel having a partition structure in which the discharge process of the impurity gas existing in the manufacturing process is completely sealed by the low partition wall and the column partition wall. Proceed. That is, since the partition wall is tapered in the height direction as in the present invention, the predetermined space acts as an exhaust passage of the impure gas, thereby improving the exhaust process characteristics.

<Bulkhead Structure According to Second Embodiment>

4 illustrates a partition structure of a plasma display panel according to a second embodiment of the present invention. As shown, the row partition 210a and the column partition 210b are stacked and stacked to form a closed type for partitioning discharge cells. An upper portion of the row partition 210a has a round shape in a partition height direction. . The round shape of the upper part of the partition wall can be made in various ways, but it is preferable to form it by applying a predetermined heat. This partition wall shape is able to flow into the desired discharge cell by reducing the friction between the phosphor slurry and the partition wall when the phosphor is applied to the discharge cell.

On the other hand, in the plasma display panel having the barrier rib structure of the present invention, the method of applying the phosphor to the discharge cells partitioned by the barrier rib is more effective when the direct patterning method is used than the screen printing method which is generally used. That is, since the viscosity of the slurry is lower than the viscosity of the phosphor slurry used in other screen printing methods when forming the phosphor layer by the direct patterning method, the upper part of the round partition wall helps to apply the phosphor slurry to a desired discharge cell. Here, the direct patterning method does not form a phosphor pattern by using an auxiliary means such as a pattern mask as in the screen printing method, and forms a phosphor layer by directly applying a phosphor slurry to a discharge cell through a nozzle of an inkjet device or a nozzle of a dispensing device. Say how.

Plasma display panel according to the present invention having such a partition structure is more smoothly compared to the plasma display panel having a bulkhead structure in which the discharge process of the impurity gas existing in the manufacturing process is completely sealed by the low partition wall and the column partition wall. Proceed. That is, when the upper portion of the partition has a rounded shape as in the present invention, since a predetermined space is formed on the partition surface, the predetermined space serves as an exhaust passage for the impure gas, thereby improving the exhaust process characteristics.

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 their All changes or modifications derived from equivalent concepts should be construed as being included in the scope of the present invention.

As can be seen from the above, the present invention can improve the partition structure of the plasma display panel to prevent flow into neighboring discharge cells when the phosphor is applied, thereby preventing the mixing of phosphors.

Claims (5)

A plasma display panel comprising a discharge cell partitioned by a row partition wall and a column partition wall and a phosphor coated on the discharge cell. And an upper width of the row partition wall is narrower than an upper width of the column partition wall. The method of claim 1, And an upper width of the row partition wall is 20% or more and 50% or less with respect to the width of the column partition wall. The method of claim 1, And an upper width of the row partition wall is 10 μm or more and 100 μm or less. A plasma display panel comprising a discharge cell partitioned by a row partition wall and a column partition wall and a phosphor coated on the discharge cell. And an upper portion of the row partition wall having a round shape in a row partition height direction. The method of claim 4, wherein And a round shape on the row partition wall is formed by heating.

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