KR20080052881A - Plasma display apparatus - Google Patents

Abstract

A plasma display device is provided to prevent a barrier rib material from collapsing at a fluorescent material firing condition by forming the barrier rib using Bi2O3 or Pb3PO4. A plasma display device includes an upper substrate, first and second electrodes, a lower substrate, a third electrode, and a barrier rib(21). The first and second electrodes are formed on the upper substrate. The lower substrate is arranged to be opposed to the upper substrate. The third electrode is formed on the lower substrate. The barrier rib is formed on the lower substrate to define discharge cells. The barrier rib is made by using one of Bi2O3 and Pb3PO4. A concentration of Bi2O3 lies between 50 and 60 wt%. A concentration of the Pb3PO4 lies between 5 and 20 wt%. The barrier rib contains CuO and MnO.

Description

Plasma display apparatus

1 illustrates an embodiment of a structure of a plasma display panel according to the present invention;

2 illustrates an embodiment of an electrode arrangement of a plasma display panel;

3 is a view showing an embodiment of the partition wall formable using the partition material of the present invention,

4 illustrates an embodiment of an electrode arrangement of a plasma display panel;

FIG. 5 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel device, and more particularly to a material of a partition wall formed in a panel for partitioning discharge cells.

In general, a plasma display panel is a partition wall formed between an upper substrate and a lower substrate to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas 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 partition provided to partition the discharge cells of the plasma display apparatus may have a collapse phenomenon during manufacturing, which may cause difficulty in manufacturing the partition. In order to compensate for this, the conventional partition may include a ceramic filler. It is formed, but there is a problem that does not obtain a satisfactory level of effect.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display apparatus having a partition including a material capable of improving a phenomenon in which a shape collapses during formation of the partition. The purpose is.

Plasma display device according to the present invention for solving the above technical problem, the upper substrate; First and second electrodes formed on the upper substrate; A lower substrate disposed to face the upper substrate; A third electrode formed on the lower substrate; And a partition wall formed on the lower substrate to partition a discharge cell, wherein the partition wall includes any one of Bi 2 O 3 and Pb 3 PO 4.

Bi2O3 contained in the barrier rib is preferably 50wt% to 60wt%, and Pb3PO4 is preferably 5wt% to 20wt%.

In addition, the partition wall may further include CuO or MnO, CuO contained in the partition wall is preferably 25wt% to 30wt%, MnO is preferably 5wt% to 15wt%.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view showing an embodiment of a plasma display panel according to the present invention.

As shown in FIG. 1, the plasma display panel includes scan electrodes 11, sustain electrodes 12, sustain electrodes 12, and address electrodes 22 formed on the lower substrate 20, which are pairs of sustain electrodes formed on the upper substrate 10. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and the bus electrodes 11b and 12b. 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). . The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed and thus not physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, the lower dielectric layer 23 and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

The partition wall 21 of the plasma display panel according to the present invention is preferably formed using at least one of Bi2O3 or Pb3PO4. The partition wall 21 may be formed by a process of completing the partition wall by firing after the basic pattern is formed using a printing and drying process.

The material for forming the partition wall 21 preferably contains 50 wt% to 60 wt% of Bi2O3, or 5 wt% to 20 wt% of Pb3PO4. By making the material forming the partition wall 21 contain Bi2O3 or Pb3PO4 having a ratio as described above, the mechanical strength of the partition wall 21 can be improved, and since the flowability of the glass powder in the phosphor firing is then suppressed. The partition shape collapse can be prevented. In more detail, when Bi2O3 is added in an amount of 50wt% to 60wt% or Pb3PO4 is added in an amount of about 5wt% to 20wt%, the self-crystallization is performed during the calcining of the partition, and the partition may be formed during the phosphor firing process after the partition is formed. May cause collapse. That is, in case of using the bulkhead material to which Bi2O3 or Pb3PO4 is added, it is calcined at a temperature of 500 ° C to 520 ° C to form crystallization. Therefore, it is possible to prevent the phenomenon that the partition shape collapses, and it is possible to form a solid partition without adding a supplementary material to improve the partition strength.

In order to explain this in more detail, it demonstrates with reference to the figure shown in FIG. Figure 2 is a schematic diagram of the phenomenon that appears during the partition wall firing using the partition material according to the present invention.

Referring to FIG. 2, the material constituting the partition wall 21 according to the present invention substantially determines the color of the partition wall 21 and the glass powder 51 including one of Bi 2 O 3 or Pb 3 PO 4 of the present invention in general glass particles. Pigment (pigment) 55 to be included.

The partition wall 21 preferably has a white color in order to smoothly reflect visible light generated from the phosphor during discharge, and the pigment 55 used for this purpose uses a white material such as TiO₂. Would be desirable.

First, the glass powder 51 and the pigment 55 mixed with the solvent are printed on the lower dielectric layer 24 during the partition wall formation process. Next, the drying process is carried out, the temperature used during drying is dried at about 120 ℃ to 200 ℃. In the drying process, the solvent is all volatilized, and the inorganic compounds form a form surrounding the glass powder 51 and the pigment 55. In this case, the inorganic compounds are various materials that may be added at the time of forming the partition wall, and may be materials that promote nucleation and materials that lower the firing temperature. In the present invention, CuO or MnO may be included in the partition material as an inorganic compound. In such a case, the glass powder 51 containing either Bi2O3 or Pb3PO4 can be promoted to crystallize upon firing, and to be able to lower the firing temperature. For this purpose, the ratio of CuO contained in the partition material is preferably 25wt% to 30wt%, and the ratio of MnO is preferably 5wt% to 15wt%.

After the drying process is performed for a predetermined time, the firing process is performed, and the partition wall firing temperature of the present invention is made at 500 ° C to 520 ° C. This is possible because the glass powder 51 containing either Bi2O3 or Pb3PO4 is used, and this is possible because the partition material contains an inorganic compound such as CuO or MnO. When firing is performed for a predetermined time using such a temperature, melting and densification of the glass powder 51 proceeds, and a fine crystal phase 60 is generated in Bi 2 O 3 or Pb 3 PO 4 to form a very hard partition.

3 is a view showing an embodiment of the partition wall formable using the partition material of the present invention.

When the partition material according to the present invention is used, since the phosphor is formed during the calcination process, since the temperature thereof is higher than the temperature used during the formation of the partition, the collapse of the partition does not occur. It is possible to form a partition. That is, since the partition material of the present invention is calcined at 500 ° C. to 520 ° C. to crystallize, the glass powder does not flow in the phosphor firing process using a temperature higher than that.

3, that is, when the width of the upper portion of the barrier rib is narrower than the width of the lower portion of the barrier rib and the side faces toward the center of the barrier rib, the visible light generated at the time of discharge is emitted outside the panel. It becomes appropriate, and the reflection of the visible light incident on the side wall of the partition can be made smoothly.

On the other hand, when the partition wall is formed using the partition material of the present invention, any shape can be easily formed as long as the shape is designed by a person skilled in the art in addition to the partition shape shown in FIG.

 FIG. 4 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel is preferably arranged in a matrix form as shown in FIG. 4. The plurality of discharge cells are provided at the intersections of the scan electrode lines Y1 to Ym, the sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zm may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines, or sequentially driven.

Since the electrode arrangement shown in FIG. 4 is only an embodiment of the electrode arrangement of the plasma panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 4. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned is also possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down in the center portion of the panel.

FIG. 5 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8 and a sustain section S1, ..., S8.

Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, a display data signal is applied to the address electrode X, and scan pulses corresponding to each scan electrode Y are sequentially applied.

In each of the sustain periods S1, ..., S8, a sustain pulse is alternately applied to the scan electrode Y and the sustain electrode Z to form wall charges in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gradations, each subfield is sequentially different at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of sustain pulses can be assigned. In order to obtain luminance of 133 gradations, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, a plasma display panel may be driven by dividing one frame into eight or more subfields, such as 12 or 16 subfields.

The number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and is applied by those skilled in the art within the technically protected scope of the present invention. This is possible.

According to the plasma display device of the present invention configured as described above, by forming the partition wall using Bi2O3 or Pb3PO4, it is not necessary to add a separate supplement such as a ceramic filler for the partition strength, the manufacturing cost is low, the phosphor firing process In order to prevent the collapse of the partition material in the fall phenomenon, those skilled in the art can implement the desired partition shape, it is possible to lower the firing temperature has the effect of facilitating the manufacturing process.

Claims (6)

Upper substrate; First and second electrodes formed on the upper substrate; A lower substrate disposed to face the upper substrate; A third electrode formed on the lower substrate; And a partition wall formed on the lower substrate to partition a discharge cell. The partition wall is plasma display device, characterized in that any one of Bi2O3 and Pb3PO4 is formed. The method according to claim 1, The plasma display device of Bi2O3 contained in the partition is 50wt% to 60wt%. The method according to claim 1, Pb 3 PO 4 contained in the partition wall is characterized in that 5wt% to 20wt%. The method according to claim 1, The partition wall further comprises a CuO or MnO plasma display device. The method according to claim 4, CuO included in the partition wall is a plasma display device, characterized in that 25wt% to 30wt%. The method according to claim 4, MnO contained in the partition wall is a plasma display device, characterized in that 5wt% to 15wt%.

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