KR100553768B1 - Plasma display panel - Google Patents

Abstract

According to the present invention, a plasma display panel is disclosed. The plasma display panel includes a transparent upper substrate, a lower substrate disposed parallel to the upper substrate, a first partition wall disposed between the upper substrate and the lower substrate to partition the space between the upper substrate and the lower substrate into a plurality of discharge spaces; Scan electrodes and common electrodes disposed in the first partition wall and disposed to face each other with discharge spaces arranged in one direction therebetween, a center part disposed in the first partition wall and extending in a direction crossing the scan electrodes, respectively; Address electrodes having protrusions protruding in a direction parallel to the scan electrodes in the center portion, phosphor layers disposed opposite the discharge spaces, and discharge gas filled in the discharge spaces. According to the disclosed plasma display panel, luminous efficiency and driving efficiency are improved, and deterioration of the phosphor layer is prevented.

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 an embodiment of the present invention,

3 is a cross-sectional view taken along line III-III of FIG. 2,

4 is a cross-sectional view taken along line IV-IV of FIG. 3,

FIG. 5 is a perspective view illustrating an electrode structure of the plasma display panel shown in FIG. 2.

<Description of Symbols for Major Parts of Drawings>

111: upper substrate 112: scanning electrode

113: common electrode 114: first partition

115: protective film 121: lower substrate

122: address electrode 122a: center portion of address electrode

122b: protrusion of address electrode 124: second partition wall

125: phosphor layer 130: discharge space

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 disposed 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 discharge spaces. The phosphor layer 25 is disposed on the lower dielectric layer 23 over the partition wall 24, and the internal space is filled with discharge gas.

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

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, Visible light is absorbed by these structures, so 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.

The present invention has been made in an effort to provide a plasma display panel having an improved structure in which the luminous efficiency and driving efficiency are improved in order to solve the above and other problems.

Another object of the present invention is to provide an improved plasma display panel in which degradation of the phosphor layer is prevented.

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

Transparent upper substrate;

A lower substrate disposed in parallel with the upper substrate;

A first partition wall disposed between the upper substrate and the lower substrate to partition a space between the upper substrate and the lower substrate into a plurality of discharge spaces;

Scan electrodes and common electrodes disposed in the first partition wall and disposed to face each other with discharge spaces arranged in one direction therebetween;

Address electrodes disposed in the first partition wall, each having a central portion extending in a direction crossing the scan electrode and a protrusion protruding from the central portion in a direction parallel to the scan electrode;

A phosphor layer disposed to face the discharge space; And

And a discharge gas filled in the discharge space.

The protrusion may be spaced apart from the scan electrode in a vertical direction.

In the present invention, the discharge space is partitioned together with the first partition, and the second partition is further provided below the first partition. In this case, the width of the upper space partitioned by the first partition is preferably narrower than the width of the lower space partitioned by the second partition.

In the present invention, it is preferable that at least the side surface of the first partition wall is covered with a protective film.

Next, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. FIG. 2 is an exploded perspective view illustrating the plasma display panel, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3. 5 is a perspective view illustrating the electrode structure of FIG. 2.

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 on a lower side thereof (as opposed to z). 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 define the discharge spaces 130 in the up and down direction, where the discharge space 130 is one of a red subpixel, a green subpixel, and a blue subpixel constituting one pixel. Subpixels.

As shown in FIG. 2, a first partition wall 114 is formed below the upper substrate 111. The discharge space 130 is defined by side surfaces of the first partition wall 114. More specifically, the upper space G1 of the discharge space 130 is partitioned. As shown in FIG. 3, the upper space G1 of the discharge space 130 concentrates an electric field by the scan electrode 112, the common electrode 113, and the address electrode 122 embedded in the first partition wall. It becomes an area.

The first partition wall 114 illustrated in FIG. 2 may extend in the x and y directions to form a matrix. The first partition wall 114 of the present invention is not limited to such a matrix shape and may be formed in a partition structure such as a waffle, a delta, or the like. The first partition wall 114 formed of a dielectric material prevents the scan electrode 112 and the address electrode 122 from being directly energized during address discharge and induces accumulation of wall charges. Dielectrics for forming the first partition 114 include PbO, B 2 O 3, SiO 2, and the like.

Referring to FIG. 2, the side surface of the first partition wall 114 is preferably covered by the protective film 115. The protective film 115 may be damaged when charged particles due to discharge collide with the first partition wall 114. To prevent a lot of secondary electrons. The protective film 115 may typically be formed of an MgO film.

The scan electrode 112 and the common electrode 113 are embedded in the first partition wall 114. The scan electrode 112 and the common electrode 113 are disposed to face each other with the discharge spaces 130 extending in one direction therebetween. The sustain discharge is performed by the scan electrode 112 and the common electrode 113 to realize an image. Referring to FIG. 5, the scan electrode 112 and the common electrode 113 are spaced apart from each other in parallel and are formed in a stripe shape extending in one direction. The scan electrode 112 and the common electrode 113 extend in the x direction across the side of the discharge space disposed therebetween, more specifically, the upper space G1.

As shown in Fig. 1, in the conventional plasma display panel, discharge is performed in the form of surface discharge, thereby forming a curved discharge path. Referring to FIG. 3, in the present invention, the scan electrode 112 and the common electrode 113 are disposed to face each other, and accordingly, the sustain discharge P1 has a counter discharge shape. Therefore, a straight discharge path can be formed, so that the discharge can be made more easily, the discharge start voltage is lowered, and the driving efficiency is improved. In particular, as the charged particles move along a straight discharge path, the probability of colliding with the barrier rib or the phosphor layer is reduced, so that the discharge start voltage and the discharge sustain voltage are lowered, the luminance characteristic is improved, and the definition is high. An advantageous plasma display panel can be provided. In addition, ion sputtering of the phosphor layer by charged particles, which has been a problem of the conventional plasma display panel, is prevented, and thus there is an advantage that permanent afterimages do not occur even when the same image is displayed for a long time.

In forming the first partition 114, the width W1 of the upper space G1 is preferably narrower than the width W2 of the lower space G2 in consideration of the sustain discharge distance. This is to facilitate the sustain discharge between the two electrodes by bringing the scan electrode 112 and the common electrode 113 close together. By adjusting the width W1 of the upper space G1, the discharge start voltage can be adjusted.

The scan electrode 112 and the common electrode 113 are formed of a metal material having excellent electrical conductivity, for example, Ag, Cu, Al, or the like. In the conventional plasma display panel, the discharge sustaining electrode pair is formed below the upper substrate, and the discharge sustaining electrode pair includes a transparent electrode such as ITO for upward transmission of visible light. In the present invention, since the scan electrodes and the common electrodes 112 and 113 are disposed in the first partition wall 114, the scan electrodes and the common electrodes 112 and 113 may be formed of metal electrodes having excellent electrical conductivity. Therefore, the voltage drop due to the electrode itself is minimized, driving efficiency and response speed are improved, and a uniform voltage can be applied to the discharge space 130 disposed at a relatively long distance from the point of application of the voltage.

Meanwhile, referring to FIG. 4, reference numeral NP denotes a non-discharge space defined by the first partition wall 114 and in which discharge is not performed. The scan electrode 112 is formed across the outside of the non-discharge space NP. ) And the width W3 is preferably designed appropriately in relation to the upper space G1 so that discharge is not performed between the and the common electrode 113.

Meanwhile, referring to FIG. 2, the address electrode 122 is buried by the first partition wall 114 above the scan electrode 112. As shown in FIG. 5, the address electrode 122 includes a central portion 122a extending in one direction (y direction) and a protrusion 122b protruding in the vertical direction (x direction) at a predetermined interval from the central portion 122a. It is provided. The central portion 122a extends in a direction (y direction) crossing the extending direction of the scan electrodes 112, and serves to apply an address voltage to the protrusion 122b. The protrusions 122b are spaced apart from each other at predetermined intervals along the center portion 122a, and the protrusions 122b are spaced apart from each other so as to be disposed directly above the scan electrode 112. The protrusion 122b, together with the scan electrode 112, is used for causing an address discharge, and serves to lower a voltage at which sustain discharge is initiated. The address discharge is a discharge occurring between the scan electrode 112 and the address electrode 122, more specifically, the protrusion 122b. When the address discharge is completed, cations are accumulated on the scan electrode 112 side, and on the common electrode 113 side. Electrons are accumulated, thereby making it easier to sustain discharge between the scan electrode 112 and the common electrode 113. When the protrusion 122b is disposed adjacent to the scan electrode 112, the address voltage can be lowered. Therefore, the protrusion 122b is preferably disposed directly above the scan electrode 112. As shown in FIG. 4, as the length L of the protrusion 122b increases, the discharge surface A between the protrusion 122b and the scan electrode 112 increases, and the protrusion 122b has a sufficient length. It is preferably formed.

In the conventional plasma display panel, an address electrode is formed below the phosphor layer, and there is a problem that the phosphor layer is deteriorated due to the impact of charged particles due to the address discharge, that is, ion sputtering, and the luminance characteristic is lowered. In the plasma display panel illustrated in FIG. 3, since the address electrode 122 is formed in the first partition wall 114, deterioration of the phosphor layer 125 may be prevented. In the conventional structure, the address discharge between the address electrode and the scan electrode is performed through the phosphor layer. However, in the present invention, the address discharge can be directly performed between the address electrode 122 and the scan electrode 112. You can expect an improvement. In particular, in the present invention, by adjusting the distance d between the scan electrode 112 and the address electrode 122, the address discharge path can be shortened, thereby achieving a desired addressing effect at a low voltage.

The second partition 124 is formed on the lower substrate 121. The second partition 124 defines a side surface of the discharge space 130 together with the first partition 114. More specifically, the second partition 124 partitions the lower space G2 of the discharge space 130. As can be seen in FIG. 3, in the present embodiment, the width W1 of the upper space G1 is relatively narrowed, so that the discharge is easily performed, while the width W2 of the lower space G2 is relatively reduced. It is made larger so that the light emitting area is increased. That is, by increasing the area in which the phosphor layer 125 is disposed, the emission area may be increased, and thus, the luminance characteristics and the luminous efficiency of the plasma display panel may be improved.

The second partition wall 124 illustrated in FIG. 2 is formed in a matrix shape extending in the x direction and the y direction. The second partition wall 124 of the present invention may be formed in a variety of structures other than the matrix shape, for example, may be formed in a partition structure such as waffle, delta type. Further, the second partition wall 124 may be formed such that the shape when viewed from above is a polygonal structure such as a pentagon or a curved structure such as an ellipse or a circle, in addition to the quadrangle shown in the drawing.

The phosphor layer 125 is formed to face the discharge space 130. More specifically, in the present embodiment, the phosphor is disposed on the lower substrate 121 surrounded by the second partition 124 over the side of the second partition 124. Layer 125 is disposed. The phosphor layer 125 receives vacuum ultraviolet rays emitted from the plasma generated by the discharge and converts the visible rays into visible light. Each discharge space 130 is divided into a red light emitting subpixel, a green light emitting subpixel, and a blue light emitting subpixel according to the type of the phosphor layer 125 disposed. The phosphor layer 125 formed on the red light emitting subpixel may include phosphors such as Y (V, P) O4: Eu. The phosphor layer 125 formed on the green light emitting subpixel may include Zn2SiO4: Mn, YBO3: Tb, or the like. The same phosphor may be included, and the phosphor layer 125 formed in the blue light emitting subpixel may include a phosphor such as BAM: Eu.

The discharge space 130 is filled with a discharge gas such as Ne, Xe, and the like, and a mixed gas thereof. In the present invention including the present embodiment, the sustain discharge is performed in the form of the counter discharge, whereby low voltage driving is possible. 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.

Referring to Fig. 3, in the plasma display panel of the present invention having the above structure, an address voltage is applied between the address electrode 122 and the scan electrode 112, so that an address discharge P2 occurs, and this address discharge is caused. As a result, the discharge space 130 in which the sustain discharge will occur is selected. Here, the address discharge P2 is executed in the vertical direction in the form of surface discharge, as shown in the figure.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the scan electrode 112 and the common electrode 113 of the selected discharge space 130, the sustain discharge P1 is generated between the scan electrode 112 and the common electrode 113. Happens. The sustain discharge is performed in the horizontal direction in the form of the counter discharge, and the ultraviolet rays are emitted while the energy level of the discharge gas excited by the sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 125. As the energy level of the excited phosphor layer 125 decreases, visible light is emitted. Here, the visible light is emitted to the outside when only the upper substrate 111 is transmitted to form an image, so that the upper transmittance of the visible light is remarkably improved. That is, in the conventional plasma display panel, visible light is absorbed by these structures while passing through the discharge sustaining electrode pair, the dielectric layer, and the protective film formed under the upper substrate, so that the luminous efficiency is very low. The problem is solved, and the upward transmittance of visible light is significantly improved.

According to the plasma display panel of the present invention, the following effects can be achieved.

First, according to the plasma display panel of the present invention, since the scan electrode and the common electrode are disposed to face each other, the sustain discharge is in the form of the counter discharge. Therefore, the sustain discharge can be easily made, and in particular, since the charged particles move along a straight discharge path, the probability of colliding with the partition or the phosphor layer is reduced, so that the discharge start voltage and the discharge sustain voltage decrease. In addition, the plasma display panel can be provided with improved luminance characteristics and advantageous for high definition. In addition, ion sputtering of the phosphor layer by charged particles, which has been a problem of the conventional plasma display panel, is prevented, and thus, permanent image retention does not occur even when the same image is displayed for a long time.

Second, according to the present invention, the address electrode is not formed below the phosphor layer, but is disposed in the partition wall, whereby deterioration of the phosphor layer is prevented. In addition, unlike the conventional structure in which address discharge is performed through the phosphor layer, in the present invention, the address discharge can be directly performed between the address electrode and the scan electrode, so that the driving efficiency can be improved by the electric field strengthening. In addition, in the present invention, the address discharge path can be shortened by adjusting the distance between the scan electrode and the address electrode, thereby achieving a desired addressing effect at a low voltage.

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 (5)

Transparent upper substrate; A lower substrate disposed in parallel with the upper substrate; A first partition wall disposed between the upper substrate and the lower substrate to partition a space between the upper substrate and the lower substrate into a plurality of discharge spaces; Scan electrodes and common electrodes disposed in the first partition wall and disposed to face each other with discharge spaces arranged in one direction therebetween; Address electrodes disposed in the first partition wall, each having a central portion extending in a direction crossing the scan electrode and a protrusion protruding from the central portion in a direction parallel to the scan electrode; A phosphor layer disposed to face the discharge space; And And a discharge gas filled in the discharge space. The method of claim 1, And the protrusion is spaced apart from the scan electrode in a vertical direction. The method of claim 1, And a second partition wall disposed below the first partition wall to partition the discharge space together with the first partition wall. The method of claim 3, The width of the upper space partitioned by the first partition wall is narrower than the width of the lower space partitioned by the second partition wall. The plasma display panel of claim 1, wherein at least a side surface of the first partition wall is covered by a protective film.

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