KR100615324B1 - Plasma display panel - Google Patents

Abstract

According to the present invention, a plasma display panel is disclosed. The plasma display panel includes an upper substrate and a lower substrate disposed to face each other, a partition wall disposed between the upper substrate and the lower substrate to define a plurality of discharge spaces together with the upper substrate and the lower substrate, and discharge spaces continuously arranged in one direction. A plurality of first discharge electrodes disposed to face each other with each other interposed therebetween, a plurality of second discharge electrodes disposed to face each other with discharge spaces continuously arranged in different directions therebetween, and a phosphor disposed to face the discharge spaces A discharge gas filled in the layer and the discharge space, the first connection electrode interconnecting the first discharge electrodes and the second connection electrode interconnecting the second discharge electrodes extend through the lower sides of the discharge spaces. . According to the disclosed plasma display panel, the light and small size of the display device can be reduced, and the luminance level and the driving efficiency are improved.

Description

Plasma Display Panel {Plasma display panel}

1 is an exploded perspective view showing a conventional plasma display panel;

2 is an exploded perspective view showing a plasma display panel according to a first embodiment of the present invention;

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

4 is a perspective view illustrating an electrode structure of the plasma display panel of FIG. 2;

5 and 6 are cross-sectional views of the plasma display panel shown in FIG. 2, taken along the lines V-V and VI-VI of FIG. 2, respectively;

FIG. 7 is a cross-sectional view illustrating a modification of the plasma display panel illustrated in FIG. 6;

8 is an exploded perspective view showing a plasma display panel according to a second embodiment of the present invention;

9 and 10 are cross-sectional views of the plasma display panel shown in FIG. 8, taken along the lines VII-VII and VII-VII of FIG. 8, respectively.

<Description of Symbols for Major Parts of Drawings>

111,311: upper substrate 112,312: first discharge electrode

113,313: second discharge electrode 114,314: partition wall

115,315: protective film 121,321: lower substrate

122,322: first connection electrode 123,323: second connection electrode

124,324 dielectric layer 125 phosphor layer

130,330: discharge space 150: filter assembly

325: lower phosphor layer 350: upper phosphor layer

The present invention relates to a plasma display panel that implements an image using gas discharge.

Recently, a device employing a plasma display panel as a flat panel display device has a large screen and has excellent characteristics of high definition, ultra-thin, light weight, and wide viewing angle, and is easier to manufacture than other flat panel display devices. It is attracting attention as a large flat panel display device.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to an applied discharge voltage, and classified into a counter discharge type and a surface discharge type according to a discharge structure. Recently, most plasma display panels produced at home and abroad are three-electrode surface discharge plasma display panels.

1 illustrates a conventional three-electrode surface discharge plasma display panel. The illustrated plasma display panel includes an upper substrate 11 and a lower substrate 21 disposed to face the upper substrate 11. Discharge sustaining electrode pairs 16 are arranged on the lower surface of the upper substrate 11, and the upper dielectric layer 14 and the protective film 15 covering the upper dielectric layer 14 are embedded in this order. Here, one electrode of the discharge sustaining electrode pair 16 is the scan electrode 12, the other electrode is the common electrode 13, and the scan electrode 12 and the common electrode 13 are transparent electrodes 12a and 13a, respectively. ) And bus electrodes 12b and 13b.

On the other hand, an upper surface of the lower substrate 21 is formed with an address electrode 22 extending to intersect with the discharge sustaining electrode pair 16 and a lower dielectric layer 23 embedded therein. A partition wall 24 is formed on the lower dielectric layer 23 to partition the plurality of discharge spaces 30. The phosphor layer 25 is disposed on the lower dielectric layer 23 over the partition wall 24, and the discharge space 30 is filled with discharge gas.

In such a plasma display panel, plasma is formed by the discharge performed by the discharge sustaining electrode pair 16, and the phosphor layer 25 is excited by the vacuum ultraviolet rays emitted from the formed plasma to emit visible light. A predetermined image is made by the visible light.

By the way, in the conventional three-electrode surface discharge structure shown in the drawing, while diverging visible light passes through the discharge sustaining electrode pair 16 formed on the lower side of the upper substrate 11, the upper dielectric layer 14, and the protective film 15, Up to about 40% of the visible light is absorbed by these structures, there is a problem that the luminous efficiency is very low. In addition, when the same image is displayed for a long time, there is a problem that the charged particles of the discharge gas strike the phosphor layer 25 and cause permanent afterimages.

An object of the present invention is to provide an improved plasma display panel in which the luminous efficiency and driving efficiency are improved and the degradation of the phosphor layer is prevented in order to solve the above and other problems.

Another object of the present invention is to provide a plasma display panel which is advantageous for light and short reduction of the display device.

In order to achieve the above objects and other objects, the plasma display panel of the present invention,

An upper substrate and a lower substrate disposed to face each other;

A partition wall disposed between the upper substrate and the lower substrate to define a plurality of discharge spaces together with the upper substrate and the lower substrate;

A plurality of first discharge electrodes disposed to face each other with discharge spaces continuously disposed in one direction;

A plurality of second discharge electrodes disposed to face each other with the discharge spaces continuously arranged in different directions therebetween;

A phosphor layer disposed to face the discharge space; And

And a discharge gas filled in the discharge space.

A first connection electrode interconnecting the first discharge electrodes and a second connection electrode interconnecting the second discharge electrodes extend through the lower sides of the discharge spaces.

In the present invention, preferably, the upper substrate is an image display surface on which display light is emitted.

In the present invention, preferably, the first connection electrode and the second connection electrode are spaced apart from each other in the vertical direction, and a dielectric layer is interposed between the first connection electrode and the second connection electrode.

In the present invention, preferably, the first connection electrode and the second connection electrode extend in a direction crossing each other.

In each discharge space, a direction in which the first discharge electrodes face each other and a direction in which the second discharge electrodes face each other may be perpendicular to each other.

In one embodiment of the present invention, a filter assembly is disposed on the upper substrate, and in another embodiment, a filter assembly is interposed between the upper substrate and the partition wall. In another embodiment, the upper phosphor layer and the lower phosphor layer are formed to correspond to each other up and down the discharge space. In this case, the upper phosphor layer may be formed over the partition wall below the upper substrate, and the lower phosphor layer may be formed over the partition wall above the lower substrate.

Next, the plasma display panel according to the first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6. 2 is an exploded perspective view showing the plasma display panel of the present embodiment, Figure 3 is a cross-sectional view taken along the line III-III of Figure 2, Figure 4 is a perspective view showing the electrode structure of the plasma display panel shown in FIG. . Referring to FIG. 2, the plasma display panel according to the present exemplary embodiment includes an upper substrate 111 and a lower substrate 121 disposed to face up and down directions (z direction). The upper substrate 111 and the lower substrate 121 are typically formed of a material mainly containing glass. In particular, when the upper substrate 111 is used as the image display surface, it is preferable that the upper substrate 111 is formed of a transparent substrate having excellent light transmittance. The upper substrate 111 and the lower substrate 121 support the structures formed therebetween, and serve to define the discharge spaces 130 in the vertical direction.

As can be seen in the figure, the partition wall 114 is disposed between the upper substrate 111 and the lower substrate 121, the partition wall 114 between the discharge space 130 by defining the side of the discharge space 130 Prevent mis-discharge. As shown in the figure, the partition wall 114 may be formed in a matrix pattern by extending in the x direction and the y direction, but the present invention is not limited to such a matrix pattern, but an open type such as a stripe. The same applies to the bulkhead, as well as to closed bulkhead structures such as waffles, deltas, and the like. Here, the closed partition wall may be formed such that the shape when viewed from above is a polygon such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle as in the present embodiment. The partition wall 114 formed of a dielectric serves to prevent the charged particles of the discharge gas from impacting the discharge electrodes 112 and 113 and to damage the discharge electrodes 112 and 113 and to induce accumulation of wall charges. For example, dielectrics forming the partition 114 include PbO, B ₂ O ₃ , and SiO ₂ . The exposed surface of the partition wall 114 is preferably covered by the protective film 115, in order to prevent the charged particles from being damaged by collision with the partition wall 114 by the discharge and to emit a lot of secondary electrons. The protective film 115 may typically be formed of an MgO film.

The first discharge electrode 112 and the second discharge electrode 113 are embedded in the partition 114. As shown in FIGS. 2 and 3, each of the first discharge electrodes 112 and the second discharge electrodes 113 is disposed to face the discharge space 130 to face each other, and to the discharge electrodes 112 and 113. By this, the display discharge is executed to realize the image. The discharge electrodes 112 and 113 are electrically connected to each other by connection electrodes 122 and 123 extending downward of the discharge space 130, and are connected to each other by the dielectric layer 124 formed on the lower substrate 121. A portion of 122,123 is buried. The dielectric layer 124 prevents charged particles of the discharge gas from being damaged by impacting the connection electrodes 122 and 123, and prevents discharge from being directly performed between the connection electrodes 122 and 123. Examples of the dielectric for forming the dielectric layer 124 include PbO, B ₂ O ₃ , SiO _2, and the like.

Referring to FIG. 4, the first discharge electrodes 112 are disposed to face each other at regular intervals, and the first discharge electrodes 112 extend in one direction (x direction). Are electrically connected to each other. The first connection electrode 122 protrudes upward from the first base portion 122a and the first base portion 122a extending in one direction (x direction) with a predetermined distance therebetween, and the first discharge electrode at the end thereof. 112 includes first connections 122b to which it is connected.

Similarly to the first discharge electrode 112, the second discharge electrodes 113 are also disposed to face each other with a predetermined interval therebetween, and the second discharge electrodes 113 extend in one direction (y direction). The second connection electrodes 123 are electrically connected to each other. The second connection electrode 123 protrudes upward from the second base part 123a extending in one direction (y direction) and the second base part 123a with a predetermined distance therebetween, and a second discharge electrode at an end thereof. 113 includes connected second connecting portions 123b. Here, the second connection electrode 123 extends in a direction crossing the extension direction (x direction) of the first connection electrode 122. For example, as shown in the drawing, the first connection electrode ( It may extend in a direction (y direction) orthogonal to the extension direction (x direction) of 122.

 The discharge electrodes 112 and 113 and the connection electrodes 122 and 123 are formed of a metal material having excellent electrical conductivity, for example, Ag, Cu, Al, or the like. This is to minimize the voltage drop caused by the resistance of the electrode itself, to improve driving efficiency and response speed, and to apply a uniform voltage to a discharge space disposed at a relatively long distance from the point of application of the voltage.

Meanwhile, referring again to FIG. 2, the filter assembly 150 is disposed on the upper substrate 111, and the filter assembly 150 may be directly attached to the upper surface of the upper substrate 111. The filter assembly 150 functions to block electromagnetic waves, neon light emission or infrared rays generated from the inside of the panel, or to block reflection of external light. To this end, the filter assembly 150 is an anti-reflection film for preventing visibility deterioration due to external light reflection, an electromagnetic shielding film for effectively blocking electromagnetic waves generated during driving, and an inert gas used for neon light emission and screen emission A selective wavelength absorbing film or the like for shielding unnecessary light emission of near infrared rays by the plasma may be formed of a laminated film. Meanwhile, the filter assembly 150 excludes a thick film-type transparent glass substrate, a plastic substrate, or the like. In addition, since the filter assembly 150 is directly attached to the upper substrate 111, a separate mounting structure for installing the filter assembly 150 is unnecessary, and thus, the plasma display device can be made light and short. have.

According to the present invention including the present embodiment, the discharge sustaining electrode pairs 16 and the discharge sustaining electrode pair which existed on the upper substrate 11 of the conventional plasma display panel shown in FIG. Since there is no dielectric layer 14 covering the fields 16, the upward transmittance of visible light is remarkably improved. That is, the discharge electrodes 112 and 113 are disposed on the side of the discharge space 130, and in particular, the connection electrodes 122 and 123 interconnecting them are concentrated on the lower side of the discharge space 130, so that the upper substrate ( The transmittance on the 111 side is improved, and thus the filter assembly 150 can be directly attached to the upper substrate 111 side.

Thus, since the discharge electrodes 112 and 113 and the connection electrodes 122 and 123 of the present invention are not disposed on the upper substrate 111 but disposed on the side of the discharge space, a transparent electrode having a large resistance can be used as the electrodes 112, 113, 122 and 123. It is not necessary to use a low resistance, for example, a metal electrode, so that the discharge response speed is high, and low-voltage driving is possible without distortion of the waveform.

Meanwhile, the phosphor layer 125 is disposed to face the discharge space 130. More specifically, the phosphor layer 125 is disposed on the side of the partition wall 114 on the dielectric layer 124 surrounded by the partition wall 114. do. The phosphor layer 125 includes a component that receives a vacuum ultraviolet ray generated by the discharge and converts it into visible light, and is roughly divided into a red phosphor layer, a green phosphor layer, and a blue phosphor layer having different emission colors.

Although not shown in the figure, the discharge space 130 is filled with a discharge gas such as Ne, Xe and the like and a mixed gas thereof. In the case of the present invention including this embodiment, the discharge surface can be increased and the discharge region can be enlarged, so that the amount of plasma formed is increased, thereby enabling low voltage driving. Therefore, in the case of the present invention, even when a high concentration of Xe gas is used as the discharge gas, low voltage driving is possible, thereby significantly improving the luminous efficiency. This solves the problem of low voltage driving when using a high concentration of Xe gas as a discharge gas in a conventional plasma display panel.

Hereinafter, a driving method of the plasma display panel of the present invention will be described with reference to FIG. 3. As shown in the figure, two first discharge electrodes 112 face each other in the x direction and one second discharge electrode 113 in the y direction, with one discharge space 130 interposed therebetween. To face. When a predetermined AC voltage is applied to the first discharge electrodes 112 and the second discharge electrodes 113, the display discharge is performed. As shown in the drawing, discharge is performed on four sides of the discharge space 130. . More specifically, the discharge is performed along the substantially circular discharge path P around the edge of the discharge space 130 between the first discharge electrode 112 and the second discharge electrode 113 adjacent to each other, and as a result discharge The gas is excited to form vacuum ultraviolet rays, which are converted into visible light by the phosphor layer to express a predetermined image.

In the conventional plasma display panel shown in Fig. 1, the display discharge between the scan electrode 12 and the sustain electrode 13 occurs in the horizontal direction, so that the discharge area is relatively narrow. However, since the display discharge of the plasma display panel 200 according to the present embodiment occurs in a horizontal direction in all aspects defining the discharge space 130, the discharge area is relatively wide.

In addition, the display discharge in this embodiment is formed in a closed curve along the side of the discharge space 130, and gradually diffuses to the center portion of the discharge space (130). As a result, the volume of the region where the display discharge occurs is increased, and the space charge in the discharge space 130, which is not well used in the past, also contributes to light emission. Such matters result in the improvement of the luminous efficiency of the plasma display panel.

In addition, in the plasma display panel according to the present embodiment, since the display discharge is made only at the portion defined by the partition wall 114, as shown in FIG. 3, the ion of the phosphor layer due to the charged particles, which has been a problem of the conventional plasma display panel. Sputtering is prevented, and thus there is an advantage that a permanent afterimage does not occur even when the same image is displayed for a long time.

Meanwhile, an address discharge may be performed before the display discharge is performed. As a result of the address discharge, the discharge space 130 in which the display discharge is to be performed is selected. That is, since the start voltage is lowered in the discharge space 130 where the address discharge is performed, the display discharge can be performed. Such address discharge can be performed by applying a predetermined address voltage between the first discharge electrode 112 and the second discharge electrode 113.

5 and 6 are cross-sectional views taken along the lines V-V and VI-VI of FIG. 2, respectively. Referring to the drawings, the first connection electrode 122 and the second connection electrode 123 may be formed of a dielectric layer ( Spaced apart from each other by 124, and this spacing d is preferably maintained at a sufficient distance so that no direct discharge is caused between them.

FIG. 7 shows a modification of the first embodiment shown in FIG. 5. Hereinafter, a description will be given focusing on differences from the first embodiment. Also in the plasma display panel shown in the drawing, the upper substrate 111 and the lower substrate 121 are disposed to face each other, and the partition wall 114 is disposed between the substrates 111 and 121 so that the discharge spaces 130 are formed. Compartment. In this modification, the filter assembly 250 is disposed between the upper substrate 111 and the partition wall 114 differently from the first embodiment. The arrangement structure of the filter assembly 250 may be changed according to the function and structure of the specific filter assembly 250, and other components are the same as those described in the first embodiment.

8 to 10 show a plasma display panel according to a second embodiment of the present invention, in which FIG. 8 is an exploded perspective view of the present embodiment, and FIGS. 9 and 10 are lines VII-VII and VII- of FIG. 8, respectively. These are cross-sectional views taken along the line. Also in the plasma display panel shown in FIG. 8, an upper substrate 311 and a lower substrate 321 are disposed to face up and down, and partition walls 314 are formed between the plurality of discharge spaces 330. . A plurality of first discharge electrodes 312 and second discharge electrodes 313 are buried in the partition wall 314, and the first discharge electrode 312 is adjacent to the first discharge electrode 312 and the discharge space ( 330 is disposed to face in the x direction, and similarly, the second discharge electrode 313 is disposed to face in the y direction with the adjacent second discharge electrode 313 and the discharge space 330 interposed therebetween. do. They are electrically connected to each other by the first connection electrode 322 and the second connection electrode 323, respectively. The first connection electrode 322 and the second connection electrode 323 are discharged through the lower side of the discharge space 330. And a dielectric layer 324 is disposed between them 322 and 323 to prevent direct discharge therebetween.

Also in the plasma display panel of this embodiment, phosphor layers 325 and 350 are formed in the discharge space 330. Here, unlike in the first embodiment, the upper phosphor layer 350 and the lower side of the discharge space 330 are formed. Phosphor layer 325 is formed. More specifically, the upper phosphor layer 350 is formed on the barrier rib 314 on the lower surface of the upper substrate 311, and the lower phosphor layer 325 is formed on the barrier rib 314 on the dielectric layer 324. . Here, the upper phosphor layer 350 and the lower phosphor layer 325 are formed to correspond up and down. That is, the phosphor layers 325 and 350 include red, green and blue phosphor layers having different emission colors, and the upper phosphor layer 350 and the lower phosphor layer 325 are disposed to have the same emission color. According to the present invention, since the electrode structure is not disposed on the upper substrate 311 side, the upper phosphor layer 350 supported on the upper substrate 311 is greatly reduced in deterioration with time, and accordingly, the light emission time elapses. A high quality display can be realized by preventing a phenomenon of deterioration of luminance.

In the illustrated plasma display panel, when a predetermined alternating voltage is applied between the first discharge electrode 312 and the second discharge electrode 313, a display discharge is performed therebetween, and the vacuum generated as a result of the display discharge is performed. When the ultraviolet rays excite the phosphor layers 325 and 350, the visible light constituting the image is emitted. Here, according to the present exemplary embodiment, since the phosphor layers 350 and 325 are formed to correspond to the upper and lower sides of the discharge space 330, the amount of vacuum ultraviolet rays immediately flowing to the outside without contributing to the image can be drastically reduced or eliminated. As a result, the luminance level and luminous efficiency of the plasma display panel can be improved. This means that the luminance level is improved for the same power consumption as compared with the conventional plasma display panel, and the power consumption can be reduced to obtain the same luminance.

Meanwhile, referring to FIGS. 9 and 10, the upper phosphor layer 350 is preferably limited to a predetermined thickness t so as not to interfere with upward transmission of visible light. For example, the upper phosphor layer 350 may be formed to have a thickness of 20 μm or less. . However, the decrease in the transmittance of visible light by the upper phosphor layer 350 can be sufficiently compensated by the increase in luminous efficiency generated by preventing the outflow of vacuum ultraviolet rays.

According to the plasma display panel according to the present invention, the electrode structure is not formed on the upper substrate side through which visible light is transmitted. Therefore, the upward transmittance of the visible light is remarkably increased, and in particular, the filter assembly can be directly attached to the upper substrate side, or the phosphor layer can be arranged on the upper substrate side. When the filter assembly is directly attached to the upper substrate side, light and small size reduction of the plasma display device can be achieved. When the phosphor layer is disposed to face up and down the discharge space, leakage of vacuum ultraviolet light is prevented, thereby increasing luminance level and driving efficiency. do.

Although the present invention has been described with reference to the embodiments shown in the 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. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (12)

An upper substrate and a lower substrate disposed to face each other; A partition wall disposed between the upper substrate and the lower substrate to define a plurality of discharge spaces together with the upper substrate and the lower substrate; A plurality of first discharge electrodes disposed to face each other with discharge spaces continuously disposed in one direction; A plurality of second discharge electrodes disposed to face each other with the discharge spaces continuously arranged in different directions therebetween; A phosphor layer disposed to face the discharge space; And And a discharge gas filled in the discharge space. And a first connection electrode interconnecting the first discharge electrodes and a second connection electrode interconnecting the second discharge electrodes extend through the lower sides of the discharge spaces. The method of claim 1, And the upper substrate is an image display surface on which display light is emitted. The method of claim 1, And the first connection electrode and the second connection electrode are spaced apart from each other in the vertical direction, and a dielectric layer is interposed between the first connection electrode and the second connection electrode. The method of claim 3, And the dielectric layer is disposed between the lower substrate and the partition wall. The method of claim 1, And the first connection electrode and the second connection electrode extend in a direction crossing each other. The method of claim 1, And a direction in which the first discharge electrodes face each other and a direction in which the second discharge electrodes face each other perpendicular to each other in each discharge space. The method of claim 1, And a filter assembly disposed on the upper substrate. The method of claim 1, And a filter assembly interposed between the upper substrate and the partition wall. The method of claim 1, And an upper phosphor layer and a lower phosphor layer formed above and below the discharge space so as to correspond to each other. The method of claim 9, The upper phosphor layer is formed over the partition wall under the upper substrate, And the lower phosphor layer is formed over the partition wall on the lower substrate. The method of claim 1, And the partition wall is formed in a matrix pattern extending in two directions crossing each other. The method of claim 1, And an exposed surface of the partition wall to the discharge space is covered by a protective film.

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