KR100603380B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel according to the present invention comprises: an upper substrate; A plurality of sustain electrode pairs formed under the upper substrate; An upper dielectric layer filling the sustain electrode pairs; A lower substrate disposed to face the upper substrate; Address electrodes formed on the lower substrate so as to intersect with the storage electrode pairs; A lower dielectric layer filling the address electrodes; A main partition wall disposed between the upper substrate and the lower substrate, the main partition walls extending in parallel with the address electrode therebetween; It is formed to extend from the main partitions, respectively, when the extended length is called Ld and the height of the main bulkhead Hm, the HL value by the relationship between them HL = Hm / Ld × 100 ranges from 1.50 to 4.80 Dummy partitions having a; And phosphor layers disposed in spaces defined by the main barrier ribs and the dummy barrier ribs, respectively.

Description

Plasma display panel {Plasma display panel}

1 is a plan view of a plasma display panel according to an embodiment of the present invention;

FIG. 2 is a partially separated perspective view illustrating a part of the plasma display panel of FIG. 1; FIG.

3 is a cross-sectional view taken along the line III-III of FIG.

<Brief description of the major symbols in the drawings>

111. Upper substrate 112. Holding electrode pair

115. Upper dielectric layer 121. Lower substrate

122. Address electrode 123. Lower dielectric layer

124..Main bulkhead 125..Discharge space

126. phosphor layer 130. sealing member

140.Dummy space 141.Dummy bulkhead

Hm..Height of main bulkhead Ld..Length of pile bulkhead

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure such that discharge efficiency is prevented from being lowered and uniform image quality can be ensured.

Recently, the plasma display panel, which is attracting attention as a substitute for the cathode ray tube, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed, and a discharge voltage is applied in a predetermined pattern by ultraviolet rays generated thereby. The formed phosphor layer is excited to display an image.

Such plasma display panels are classified into DC type and AC type according to the driving method. In a DC plasma display panel, electrodes are exposed to a discharge space to directly transfer charges between corresponding electrodes. In an AC plasma display panel, at least one electrode is covered with a dielectric layer to accumulate wall charges accumulated in the dielectric layer. The discharge is caused by the movement of the wall charge.

In the DC plasma display panel, since the charge is directly transferred between the corresponding electrodes, there is a problem that the electrodes are severely damaged. In recent years, an AC plasma display panel having a three-electrode surface discharge structure has been adopted. There is a trend.

In general, the AC plasma display panel includes two main substrates that are spaced apart in parallel, and main partitions partitioning a space therebetween in a predetermined pattern, and the discharge spaces between the main partition walls are red, Any one of the green and blue phosphor layers is selectively disposed.

The red, green, and blue phosphor layers may be formed by various methods. For example, the screen printing method prints the red, green, and blue phosphors sequentially three times. There is a problem of wasting. In order to solve such a problem, the nozzle injection method is used recently.

The nozzle spraying method is a method of forming red, green, and blue phosphor layers by simultaneously spraying red, green, and blue phosphors in a paste state into discharge spaces between main partition walls by a plurality of nozzles, respectively. Since the nozzle spraying method has an unstable discharge amount and discharge pressure of the initially injected phosphors, the phosphors may be formed to have uniform thicknesses of red, green, and blue phosphor layers to obtain uniform image quality of the panel. After the discharge amount, the discharge pressure, etc. are stabilized, they are injected into the discharge spaces.

As described above, dummy spaces are provided at the outermost sides of the discharge spaces so that the phosphors in which the discharge amount and the discharge pressure are unstable may be injected first until the discharge amount and the discharge pressure of the phosphor are stabilized. The dummy spaces should have a sufficient size so that the discharge amount, discharge pressure, etc. of the phosphor can be stabilized quickly and formed in the discharge spaces with a uniform thickness, respectively.

However, in order to sufficiently secure such dummy spaces, in the conventional structure in which the dummy partitions extend from the main partitions to form dummy spaces, the dummy partitions are disposed too close to the sealing member that couples the two substrates. Can be. In this case, since the space between the dummy partitions and the sealing member becomes too narrow, the exhaust is not made smoothly through the space between the dummy partitions and the sealing member. As a result, impurities may remain to raise the discharge voltage or cause an erroneous discharge, thereby causing a problem that the discharge efficiency is lowered.

The present invention is to solve the above problems, by setting the extended length of the dummy partition wall to a predetermined range so as to secure a sufficient space with the sealing member and to stabilize the discharge amount and the discharge pressure of the phosphor quickly, discharge It is an object of the present invention to provide a plasma display panel in which efficiency is prevented from being lowered and uniform image quality can be ensured.

Plasma display panel according to the present invention for achieving the above object,

An upper substrate;

A plurality of sustain electrode pairs formed under the upper substrate;

An upper dielectric layer filling the sustain electrode pairs;

A lower substrate disposed to face the upper substrate;

Address electrodes formed on the lower substrate so as to cross the sustain electrode pairs;

A lower dielectric layer filling the address electrodes;

A main partition wall disposed between the upper substrate and the lower substrate and extending in parallel with the address electrode therebetween;

HL values formed by extending from the main barrier ribs, respectively, when the extended length is Ld and the height of the main barrier rib is Hm, HL = Hm / Ld × 100, which is a relation between them, is 1.50 to 4.80 Dummy bulkheads having a range of;

And phosphor layers disposed in spaces defined by the main barrier ribs and the dummy barrier ribs, respectively.

Here, the HL value is preferably in the range of 1.50 to 3.43.

Here, the dummy partitions are preferably formed at substantially the same height as the main partitions.

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

1 is a plan view of a plasma display panel according to an exemplary embodiment of the present invention.

The illustrated plasma display panel 100 includes an upper panel 110 and a lower panel 120 that is opposite to and coupled to the upper panel 110. The common area C, which is an area where the upper panel 110 and the lower panel 120 overlap, may be roughly divided into a display area D and a non-display area N. FIG. Here, the display area D is located at the center of the common area C to correspond to the area where the image is displayed, and the non-display area N is located at the edge of the common area C to display the image. It corresponds to an area that is not displayed. In the non-display area N, a sealing member 130 such as a frit is formed to surround the display areas along an edge thereof, thereby bonding the upper panel 110 and the lower panel 120 to each other to seal the display area.

The display area D and the non-display area N will be described in more detail with reference to FIGS. 2 and 3. In FIG. 2, a partially separated perspective view of a portion of the display area and the non-display area is illustrated in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2.

2 and 3, the upper substrate 111 is formed of a transparent glass material through which an image can pass, and the lower substrate 121 is disposed to face the upper substrate 111.

A plurality of storage electrode pairs 112 extending in one direction are disposed below the upper substrate 111, and an upper portion of the lower substrate 121 extends to cross the storage electrode pairs 112. The address electrodes 122 are disposed. The address electrodes 122 are arranged in a stripe shape on the upper surface of the lower substrate 121, and are covered by the lower dielectric layer 123 formed on the upper surface of the lower substrate 121.

In addition, the storage electrode pairs 112 are formed on the lower surface of the upper substrate 111, and each of the storage electrode pairs 112 includes a common electrode 113 and a scan electrode 114 that form a discharge gap G. The scan electrode 114 generates an address discharge together with the address electrode 122, and the common electrode 113 generates a sustain discharge together with the scan electrode 114.

As illustrated, the common electrode 113 includes a common transparent electrode 113a and a common bus electrode 113b connected to the common electrode 113, and the scan electrode 114 is a scan transparent electrode 114a and a scan connected thereto. The bus electrode 114b may be provided.

The common and scan transparent electrodes 113a and 114a are formed of indium tin oxide (ITO), which is a transparent material, to transmit visible light generated during discharge. The common and scan bus electrodes 113b and 114b connected to the common and scan transparent electrodes 113a and 114a respectively serve to apply voltages to the common and scan transparent electrodes 113a and 114a, respectively. In order to improve the electrical resistance of the common and scan transparent electrodes 113a and 114a formed of ITO having relatively low electrical conductivity, it is preferable to be formed of a metal such as copper, silver, etc. having excellent conductivity. The common and scan bus electrodes 113b and 114b have a width smaller than that of the common and scan transparent electrodes 113a and 114a and extend in a direction crossing the address electrode 122.

The storage electrode pairs 112 are covered by the upper dielectric layer 115 formed on the lower surface of the upper substrate 111. In addition, the upper dielectric layer 115 may be covered by a protective film 116 formed of MgO or the like, wherein the protective film 116 directly impinges the upper dielectric layer 115 by collision of charged particles with the upper dielectric layer 115 during discharge. It can prevent damage, and when charged particles collide, it can release secondary electrons and play a role of increasing discharge efficiency.

The main barrier ribs 124 are formed in a predetermined pattern between the upper substrate 111 and the lower substrate 121, that is, between the passivation layer 116 and the lower dielectric layer 123, and have a stripe shape. Here, the main partitions 124 are disposed in parallel with each other between the address electrodes 122. The main partitions 124 are limited to the plurality of discharge spaces 125 and prevent cross talk between adjacent discharge spaces 125. Discharge gas is filled in the discharge spaces 125 defined by the main partitions 124, and a penning mixture gas may be employed as the discharge gas. In the discharge spaces 125, the storage electrode pairs 112 and the address electrode 122 intersect with each other, and the intersections of the storage electrode pairs 112 and the address electrode 122 cross each other. This corresponds to each of them. On the other hand, the main partition wall is not limited to the above, it may be formed in a structure that can limit the discharge space in the form of a matrix or delta.

As described above, the phosphor layer 126 is disposed in the discharge spaces 125 defined by the main partition walls 124. That is, the phosphor layer 126 is formed by applying phosphors on inner surfaces of the main barrier ribs 124 and an upper surface of the lower dielectric layer 123 defined by the main barrier ribs 124.

Phosphors forming the phosphor layer 126 are roughly divided into red, green, and blue phosphors that emit light of red, green, and blue colors, respectively, so that red, green, and blue phosphor layers are formed. (126R) 126G and 126B are formed, respectively. The discharge spaces 125 in which the red, green, and blue phosphor layers 126R, 126G, and 126B are disposed respectively form the red, green, and blue discharge spaces 125R, 125G, and 125B, respectively. The red, green, and blue discharge spaces 125R, 125G, and 125B include red, green, and blue subpixels, and adjacent red, green, and blue subpixels form a group to form a unit pixel. Done.

Meanwhile, the phosphor layer 126 may be formed by various methods. For example, the nozzle spray method may spray red, green, and blue phosphors in a paste state into the discharge spaces 125 by a plurality of nozzles, respectively. The red, green, and blue phosphor layers 126R, 126G, and 126B are formed to have a predetermined thickness. According to the nozzle spraying method, the phosphor layer 126 is formed by spraying the phosphor paste into the discharge spaces 125 along the direction in which the address electrodes 122 respectively extend by at least one nozzle.

The nozzle spraying method has characteristics that the discharge amount and discharge pressure of the initially injected phosphors are unstable. In order to obtain uniform image quality of the panel 100, the red, green, and blue phosphor layers 126R (126G) Since the discharge holes 126B must be formed to have substantially uniform thicknesses in the discharge spaces 125, the discharge spaces 125 and the discharge pressure of the phosphor are stabilized, and then sprayed into the discharge spaces 125 between the main partitions 124 after the discharge amount and the discharge pressure of the phosphor are stabilized. Need to be.

To this end, dummy partitions 141 according to an aspect of the present invention are disposed outside the ends of the main partitions 124, respectively. That is, the dummy partitions 141 are formed to extend from ends of the main partitions 124, respectively. Here, as shown, the dummy partition wall 141 may be formed such that the center line along the longitudinal direction coincides with the center line along the longitudinal direction of the main partition wall 124, and the height and the width of the main partition wall 124 are different from each other. It can be formed substantially the same as the height and the width, respectively. However, it is not necessarily limited thereto.

The dummy barrier ribs 141 having the above structure form dummy spaces 140 therebetween, and the dummy spaces 140 formed as described above are initially sprayed with phosphors having an unstable discharge amount and discharge pressure therein. As a result, the discharge amount and the discharge pressure of the phosphor can be stabilized, thereby acting as a buffer.

When the length of the dummy partitions 141 forming the dummy spaces 140 is too short, the size of the dummy spaces 140 becomes small, so that the discharge amount and the discharge pressure of the phosphor, etc., pass through the dummy spaces 140. This is not sufficiently stabilized, so that the phosphor layer 126 cannot be formed in the discharge spaces 125 with a uniform thickness and height, respectively. As a result, it is difficult to ensure uniform image quality of the panel 100. On the contrary, when the extended lengths of the dummy barrier ribs 141 become too long, the gap between the sealing member 130 sealing between the upper panel 110 and the lower panel 120 becomes small, and the dummy barrier rib 141 is provided. ) And the spaced space between the sealing member 130 becomes too narrow, the exhaust is not made smoothly through the spaced space. As a result, there is a high possibility that impurities may remain and the discharge efficiency may be lowered by raising the discharge voltage or causing an erroneous discharge.

Therefore, the extended length of the dummy partition wall 141 needs to be set in a predetermined range. Meanwhile, sizes of the dummy spaces 140 vary according to the heights of the dummy partitions 141. The dummy partitions 141 are formed to have substantially the same height as the main partitions 124. The ratio between the height of 124 and the length of the dummy partition wall 141 needs to be set in an optimum range.

The setting of the optimum range for the ratio between the height of the main partition wall 124 and the length of the dummy partition wall 141 may be made based on the experimental data summarized in Table 1 below.

In Table 1, when the height of the main bulkhead is Hm and the length of the dummy bulkhead is Ld, the height and luminance values of the phosphor layer according to the HL value calculated by the relational equation HL = Hm / Ld × 100 are shown. Each is summarized. Here, as the experimental conditions of Table 1, a Ne-Xe mixed discharge gas having a content ratio of 42 "SD and 90% -10% (450 Torr) was employed.

Height of main bulkhead Hm (㎛) Length of dummy bulkhead Ld (㎛) HL = Hm / Ld × 100 Height of phosphor layer (㎛) Luminance (㏅ / ㎡) 120 9000 1.33 117 1000 8500 1.41 117 1000 8000 1.50 117 1000 7500 1.60 117 1000 7000 1.71 118 1000 6500 1.85 118 1000 6000 2.00 118 1000 5500 2.18 118 1000 5000 2.40 118 1000 4500 2.67 118 1000 4000 3.00 114 1000 3500 3.43 110 1000 3000 4.00 106 960 2500 4.80 100 950 2000 6.00 90 890 1500 8.00 85 850

Referring to Table 1, when the HL value is 4.80, that is, when the Hm value, which is the height of the main partition wall, is 120 μm, and the Ld value, which is the length of the dummy partition wall, is 3000 μm, the height of the phosphor layer formed in the discharge space is 100. It can be seen that the micrometer corresponds to about 83% of the height of the main barrier rib, 120 mu m, and the luminance has a value of 950 mW / m 2. When the HL value is larger than 4.80, it can be seen that the height of the phosphor layer formed in the discharge space is also smaller than 100 μm and the luminance is smaller than 950 mW / m 2. The height of the phosphor layer is 83% or more with respect to the height of the main partition wall, and the HL value should be set to 4.80 or less in order to secure the luminance to 950 mW / m 2 or more. More preferably, in order to ensure the height and brightness of the phosphor layer higher, that is, the height of the phosphor layer is 90% or more with respect to the height of the main partition wall, and the HL value is secured to ensure that the brightness is 1000 mW / m 2 or more. It may be set to 3.43 or less.

On the other hand, when the HL value is smaller than 1.50, the height of the phosphor layer is 90% or more with respect to the height of the main bulkhead, and the brightness can be ensured to be 1000 mW / m2 or more, but the length of the dummy bulkhead is too long to seal the sealing member. By being close to, there was a problem that exhaust through the spaces between them was not smooth.

From the results as described above it can be seen that the HL value may have a range of 1.50 to 4.80, more preferably 1.50 to 3.43. As such, the range of the ratio between the height of the main barrier rib 124 and the length of the dummy barrier rib 141 is optimally set, so that the discharge amount and the discharge pressure of the phosphor may be stabilized while passing through the dummy space 140. Therefore, the thickness and height of the phosphor layer 126 may be sufficiently secured in the discharge spaces 125. In addition, the spaced space between the dummy barrier ribs 141 and the sealing member 130 may be sufficiently secured so that the exhaust air may be smoothly spaced through the spaced space.

As described above, according to the present invention, by setting the extended length of the dummy partition wall to a predetermined range, the space with the sealing member can be sufficiently secured and the exhaust is made smoothly, thereby preventing the discharge efficiency from being lowered. Can be. Then, the discharge amount, discharge pressure, and the like of the phosphor can be stabilized quickly, and the effect of ensuring uniform image quality is obtained.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (6)

An upper substrate; A plurality of sustain electrode pairs formed under the upper substrate; An upper dielectric layer filling the sustain electrode pairs; A lower substrate disposed to face the upper substrate; Address electrodes formed on the lower substrate so as to cross the sustain electrode pairs; A lower dielectric layer filling the address electrodes; A main partition wall disposed between the upper substrate and the lower substrate and extending in parallel with the address electrode therebetween; HL values formed by extending from the main barrier ribs, respectively, when the extended length is Ld and the height of the main barrier rib is Hm, HL = Hm / Ld × 100, which is a relation between them, is 1.50 to 4.80 Dummy bulkheads having a range of; And a phosphor layer disposed in the spaces defined by the main barrier ribs and the dummy barrier ribs, respectively. The method of claim 1, And the HL value is in the range of 1.50 to 3.43. The method of claim 1, The phosphor layer includes red, green, and blue phosphor layers, and phosphor layers having the same color are disposed along a direction in which the main partition walls extend. The method of claim 1, The dummy barrier ribs are disposed to be spaced apart from the sealing member for coupling between the upper substrate and the lower substrate. The method of claim 1, And the dummy barrier ribs are formed at substantially the same height as the main barrier ribs. The method of claim 1, And the dummy barrier ribs are formed to have substantially the same width as the main barrier ribs.

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