KR20070109433A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to increase the uniformity of discharge and the amount of discharge by inducing opposite discharge, thereby improving the luminous efficiency. Barrier ribs(115,124) are formed between a first substrate(111) and a second substrate(121) to define discharge cells(126). First discharge electrodes(112) are formed in the barrier ribs, and second discharge electrodes(113) are spaced apart from the first discharge electrodes in the barrier ribs. Address electrodes(122) are formed to intersect the first and second discharge electrodes. Floating electrodes(122a) are interposed between any one of the first and second discharge electrodes and the address electrodes.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view schematically illustrating a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.

FIG. 3 is a conceptual diagram schematically illustrating a position and a shape of a first discharge electrode, a second discharge electrode, and an address electrode of FIG. 1.

FIG. 4 is a conceptual diagram schematically illustrating a position and a shape of a first discharge electrode, a second discharge electrode, and an address electrode of a plasma display panel according to another exemplary embodiment of the present invention.

FIG. 5 is a conceptual diagram schematically illustrating a position and a shape of an address electrode and a floating electrode of a plasma display panel according to another embodiment of the present invention.

6 is an exploded perspective view schematically illustrating a plasma display panel according to another embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view taken along the line VII-VII of FIG. 6.

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

111: first substrate 112: first discharge electrode

113: second discharge electrode 115: first partition wall

116: protective film 121: second substrate

122: address electrode 122a: floating electrode

123: dielectric layer 124: second partition wall

125: phosphor layer 126: discharge cell

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 in which driving voltage and power consumption are reduced while increasing luminance by inducing opposite discharge to increase uniformity and amount of discharge to improve luminous efficiency. will be.

In general, a plasma display panel is a flat panel display device that realizes a predetermined image by exciting phosphors by ultraviolet rays generated by gas discharge, and is a next-generation thin flat panel display device that can be thinned and composed of a large screen with high resolution. Be in the spotlight.

Such plasma display panels are divided into AC type, DC type, and hybrid type according to the structure and driving principle. Especially, AC type and DC type plasma display panel are according to the discharge structure. Is divided into surface discharge type and counter discharge type.

In the AC type surface discharge plasma display panel, since the discharge electrode pairs causing the discharge are disposed on the surface of the substrate, which is the path of the light propagated through the visible light, the discharge electrode pairs must be formed of a transparent material having high visible light transmittance. The discharge electrode pair is an electrode that displays the gray scale of the plasma display panel to implement an image, and thus plays a large role in power consumption and image quality of the plasma display panel, so that the quality of the plasma display panel can be improved by appropriate modification. However, due to the limitation of using a material having a predetermined transparency for the visible light transmittance, there are many limitations in the selection of the shape and the material of the electrode, thereby limiting the quality of the plasma display panel.

In order to solve the problems of the conventional surface discharge plasma display panel, a counter discharge plasma display panel has been proposed. However, the conventional counter-discharge plasma display panel has a problem in that the discharge start voltage for initiating the discharge between the discharge electrode and the address electrode at the time of addressing is too high, so that the power consumption is large and the lifetime of the plasma display panel is short.

The present invention has been made to solve various problems including the above problems, plasma in which the driving voltage and power consumption are reduced while increasing the luminance by improving the luminous efficiency by inducing opposite discharge to increase the uniformity and discharge amount of the discharge. It is an object to provide a display panel.

According to the present invention, a partition wall disposed between a first substrate, a second substrate facing the first substrate, the first substrate and the second substrate, and defining discharge cells together with the first substrate and the second substrate are provided. And first discharge electrodes disposed in one direction in the partition wall and spaced apart from the first discharge electrode and disposed in the partition wall and disposed to face the first discharge electrode with respect to the center of each discharge cell. Second discharge electrodes, address electrodes intersecting the first discharge electrodes and the second discharge electrodes, electrodes of any one of the first discharge electrodes and the second discharge electrodes, and the address. The present invention provides a plasma display panel comprising floating electrodes disposed between the electrodes and a phosphor layer disposed in the discharge cell.

According to another aspect of the present invention, the address electrodes may be further provided with a first dielectric layer disposed on one of the first substrate and the second substrate and covering the address electrodes.

According to another feature of the present invention, the floating electrodes may be further provided with a second dielectric layer disposed on the first dielectric layer and covering the floating electrodes.

According to still another feature of the present invention, the address electrode may be disposed to correspond to the non-discharge area of the discharge cell, and the address electrode may include a protrusion projecting into the discharge cell.

According to still another feature of the present invention, the protruding portion of the address electrode may be further disposed adjacent to any one of the adjacent first discharge electrode and the second discharge electrode.

According to still another feature of the present invention, the floating electrode may have a shape corresponding to the protruding portion of the address electrode.

According to another feature of the present invention, the light generated in the discharge cell may be extracted to the outside through the substrate on which the address electrodes of the first substrate and the second substrate are arranged.

According to still another feature of the present invention, it may be further provided with a protective layer disposed on at least part of the side surface of the partition wall.

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

1 is an exploded perspective view schematically illustrating a plasma display panel according to an embodiment of the present invention, FIG. 2 is a cross-sectional view schematically illustrating a cross section taken along line II-II of FIG. 1, and FIG. 3 is FIG. 1. Fig. 1 is a conceptual diagram schematically showing the position and shape of each of the first discharge electrode, the second discharge electrode and the address electrode.

Referring to the drawings, the plasma display panel according to the present exemplary embodiment is disposed such that the first substrate 111 and the second substrate 121 face each other. The first substrate 111 and the second substrate 121 may be formed of a material such as glass or plastic.

Partition walls 115 and 124 are provided between the first substrate 111 and the second substrate 121. The partition wall may be provided integrally, but the partition walls 115 and 124 may have a second direction in the direction of the first partition wall 115 and the second substrate 121 in the direction of the first substrate 111 as shown in FIG. 1. The partition wall 124 may be provided. Hereinafter, a case in which the partition wall includes the first partition wall 115 and the second partition wall 124 as shown in FIG. 1 will be described. However, the present invention is not limited thereto. The partition walls 115 and 124 define discharge cells 126 together with the first substrate 111 and the second substrate 121. In this case, although the partition walls 115 and 124 are provided in a lattice form in FIG. 1 to limit the discharge cells 126, the present invention is not limited thereto. That is, various modifications are possible such that the partition walls 115 and 124 may be provided in a stripe shape in one direction, for example, the x direction in FIG. 1. In addition, the shape of the discharge cells 126 defined by the partition walls 115 and 124 may also be variously modified, and the various modifications may be made, such that the arrangement may also be arranged in a delta form. Although the cross-section of the discharge cell 126 is shown in FIG. 1 as a quadrangle, various modifications may be made to polygons such as triangles, pentagons, circles, or ellipses. The same is true in the embodiments to be described later.

The partition wall, particularly as shown in FIG. 1, is preferably the first partition wall 115 formed of a dielectric. This is because the first discharge electrode 112 and the second discharge electrode 113 are provided in the partition wall, particularly as shown in FIG. 1, as described later in the first partition wall 115. That is, to prevent the first discharge electrode 112 and the second discharge electrode 113 from directly energizing each other, and to prevent the charged particles from damaging them by colliding with the discharge electrodes 112 and 113. Such dielectrics include PbO, B ₂ O ₃ and SiO ₂ .

Of course, the first discharge electrode and the second discharge electrode may be disposed on the surface of the first partition wall 115, respectively, and a protective layer covering the first discharge electrode and the second discharge electrode may be formed, in which case such a protective layer may also be formed. As a component of the first partition, the result is the same structure as that in which the first discharge electrode and the second discharge electrode are provided in the partition.

On the other hand, it is preferable to cover at least a part of the side surface of a partition by a protective film. In FIG. 1, the side surface of the first partition wall 115 forming the partition wall is illustrated as being covered by the protective film 116. The protective film 116 is formed by depositing a material such as MgO.

The first discharge electrodes 112 are provided in one direction in the partition wall. 1 and 2, the first discharge electrodes 112 extending in the x direction are disposed in the first partition wall 115. The second discharge electrode 113 is provided to face the first discharge electrode 112 based on the center of each discharge cell 126. The second discharge electrode 113 may also be disposed in the first partition wall 115 in the case of the partition wall and FIGS. 1 and 2, and is spaced apart from the first discharge electrode 112. In this case, since the second discharge electrode 113 is disposed to face the center of the first discharge electrode 112 and the respective discharge cells 126, the second discharge electrode 113 also has the first discharge electrode 112. Similarly, in the case of one direction, FIGS. 1, 2, and 3, the extension is provided in the x direction.

The first discharge electrode 112 and the second discharge electrode 113 are electrodes for sustain discharge, and sustain discharge for realizing an image of the plasma display panel occurs between the electrodes. The first discharge electrode 112 and the second discharge electrode 113 may be formed of a conductive metal such as aluminum or copper.

Meanwhile, address electrodes 122 are provided to intersect the discharge electrodes 112 and 113, that is, extend in the y direction. In such an electrode arrangement structure, an address discharge occurs between any one of the first discharge electrode 112 and the second discharge electrode 113 and the address electrode 122, and then the first discharge electrode 112 and the second discharge electrode 112. This is to cause sustain discharge between the discharge electrodes 113. 1 and 2, the address electrodes 122 are disposed on the surface 111a of the first substrate 111 in the direction of the second substrate 121.

As described above, each discharge cell of the plasma display panel driven by the address discharge and the sustain discharge is further provided with at least one address electrode in addition to two discharge electrodes (one discharge electrode pair), which are commonly referred to as X electrodes and Y electrodes. The address discharge is a discharge that occurs between the Y electrode and the address electrode. As in the case of the plasma display panel according to the present embodiment, the address electrode 122 is disposed above the first discharge electrode 112 and the second discharge electrode 113. When arrange | positioned, either one of the 1st discharge electrode 112 and the 2nd discharge electrode 113 becomes a Y electrode, and the other electrode becomes an X electrode. In this case, the electrode serving as the Y electrode may be disposed closer to the address electrode 122 than the electrode serving as the X electrode.

The address electrode 122 may also be formed of a conductive metal such as aluminum or copper. When the light generated inside the plasma display panel is emitted in the direction in which the address electrode 122 is provided, that is, the first substrate 111 When emitted to the outside through), it is preferable that the address electrode 122 is formed to be transparent or translucent. In order to form the transparent electrode, a transparent material such as indium tin oxide (ITO) may be used.

In this case, a bus electrode (not shown) may be further provided on the address electrode 122 as necessary. Since the address electrode formed of a transparent or translucent material generally has a high resistance, the bus electrode may be further provided to prevent the voltage drop caused by the high resistance. Therefore, the bus electrode may be formed of silver, copper, gold, aluminum, or the like having low resistance and high electrical conductivity. In addition, the contrast may be improved by including a black additive in the bus electrode or by having the multilayer structure including a layer formed of a black material.

The address electrode 122 is connected to a connection cable disposed at an edge of the plasma display panel to be supplied with power, and various modifications are possible, such that only the bus electrode may be connected to the connection cable.

The address electrodes 122 are covered by the first dielectric layer 1231, and the floating electrode 122a is provided on the surface of the first dielectric layer 1231 in the direction of the second substrate 121. 122a is covered with a second dielectric layer 1232. The first dielectric layer 1231 prevents the address electrode 122 and the floating electrode 122a from directly conducting electricity, and the second dielectric layer 1232 prevents the charged particles from damaging them by colliding with the floating electrode 122a. For sake. Such dielectrics include PbO, B ₂ O ₃ and SiO ₂ . When light generated inside the plasma display panel is extracted to the outside through the first substrate 111, the first dielectric layer 1231 and the second dielectric layer 1232 may be formed of a transparent material.

In this case, at least part of the surface of the second dielectric layer 1232 is preferably covered by a protective film (not shown). The protective film is formed by depositing a material such as MgO. In addition to protecting the second dielectric layer 1232, the passivation layer also emits secondary electrons to further activate discharge.

Meanwhile, as described above, the partition wall defining the discharge cells 126 may include a first partition wall 115 and a second partition wall 124 as shown in FIG. 1. In this case, the second partition wall 124 is provided in the direction of the second substrate 121, and the second partition wall 124 includes a phosphor layer including a red light emitting phosphor, a phosphor layer including a green light emitting phosphor, and a blue light emitting phosphor. The region in which the phosphor layer is disposed is partitioned. In addition, similar to the first partition wall 115, the second partition wall 124 also has a lattice shape in which a space having a rectangular cross section is arranged in a matrix form. Accordingly, the second partition 124 also defines a space having a closed cross section. Of course, as described above, the second partition 124 may be modified in various forms.

The phosphor layer 125 disposed inside the discharge cell 126, more specifically, on the upper surface 121a of the second substrate 121 and the side surface 124a of the second partition wall, includes a red light emitting phosphor, a green light emitting phosphor, One phosphor in the blue light-emitting phosphor, and a phosphor paste mixed with a solvent and a binder are applied to the upper surface 123a of the second substrate 121 and the side surface 124a of the second partition wall, and then dried and baked. Examples of the red light emitting phosphor include Y (V, P) O ₄ : Eu, and examples of the green light emitting phosphor include Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the blue light emitting phosphor includes BAM: Eu.

1 and 2 illustrate that the phosphor layer 125 is disposed on the upper surface 121a of the second substrate 121 and the side surface 124a of the second partition wall, but the position of the phosphor layer 125 is not limited thereto. 126).

The discharge gas is filled in the discharge cell 126 or maintained in a vacuum. When filled with the discharge gas, the discharge gas is, for example, a Ne-Xe mixed gas containing 5% to 15% of Xe. If necessary, at least a part of Ne may be replaced with He. Of course, other gases can also be used.

In the above structure, the floating electrode 122a is provided between any one of the first discharge electrode 112 and the second discharge electrode 113 and the address electrode 122, so that the first discharge electrode at the address ( The voltage difference between any one of the 112 and the second discharge electrode 113 and the address electrode 122 can be significantly lowered. This can improve the life of the plasma display panel while lowering power consumption.

The floating electrode 122a may be grounded or not grounded, and no electrical signal may be directly applied. As a result, a voltage difference between any one of the first discharge electrode 112 and the second discharge electrode 113 and the address electrode 122 may be reduced. For example, when no electrical signal is directly applied to the floating electrode 122a, the potential between the potential of one of the first discharge electrode 112 and the second discharge electrode 113 and the potential of the address electrode 122 is changed. The floating electrode 122a is present. As a result, an electric force line from one of the first discharge electrode 112 and the second discharge electrode 113 toward the address electrode 122 passes through the floating electrode 122a to facilitate the formation thereof. The voltage difference between any one of the discharge electrode 112 and the second discharge electrode 113 and the address electrode 122 is greatly reduced, and as a result, the lifetime of the plasma display panel can be significantly improved.

In FIG. 1 and FIG. 2, the floating electrode 122a is shown to correspond to the shape of the address electrode 122, but may have a different shape. That is, in the neighboring discharge cells 126, various modifications are possible, such as floating electrodes may not be connected to each other.

FIG. 4 is a conceptual diagram schematically illustrating a position and a shape of a first discharge electrode, a second discharge electrode, and an address electrode of a plasma display panel according to another exemplary embodiment of the present invention.

Referring to FIG. 4, the plasma display panel according to the present embodiment differs from the plasma display panel according to the above-described embodiment in that the address electrode 122 is disposed so as to correspond to the non-discharge area of the discharge cell, and the address electrode ( 122 has a protrusion 1221 protruding into the discharge cell. This structure is more effective especially when light generated in the discharge cell is taken out through the substrate on which the address electrode 122 is disposed. That is, even if the address electrode 122 is formed of a transparent material or a translucent material, light generated in the discharge cell may be prevented from being taken out to the outside, and thus, the non-discharge area of the discharge cell such as the top of the partition wall may be prevented. This possibility can be prevented by having the address electrode 122 arranged. In this case, as described above, the address electrode 122 generates a discharge between any one of the first discharge electrode 112 and the second discharge electrode 113, and the address electrode 122 is used to facilitate this. The protrusion 1221 of FIG. 2 may be disposed closer to any one of the adjacent first discharge electrode 112 and the second discharge electrode 113.

Meanwhile, as described above, the floating electrode does not necessarily have the same shape as that of the address electrode 122. In this case, the plasma display panel according to another embodiment of the present invention shown in FIG. As can be seen from the conceptual diagram schematically showing the position and shape of the address electrode 122 and the floating electrode 122a of each other, the floating electrode 122a has a shape corresponding to the protrusion 1221 of the address electrode 122. Various modifications are possible, such as to have a.

In the above-described embodiments, the case in which the address electrode is disposed on the first substrate has been described, but a different structure is also possible. For example, as can be seen in the plasma display panel according to another embodiment of the present invention illustrated in FIGS. 6 and 7, the address electrode 122, the first dielectric layer 1231, and the floating on the second substrate 121 are floated. The electrode 122a and the second dielectric layer 1232 may be provided, and the phosphor layer 125 may be provided on the second dielectric layer 1232. In this case, when light generated in the discharge cell 126 is emitted to the outside through the first substrate 111, the address electrode 122, the first dielectric layer 1231, the floating electrode 122a and the second dielectric layer ( The 1232 may not be formed of a transparent material, but may be formed of a reflective material, such that various modifications may be made such that light may be directed toward the first substrate 111.

According to the plasma display panel of the present invention made as described above, it is possible to implement a plasma display panel in which the driving voltage and the power consumption are reduced while increasing the luminance by increasing the uniformity and the discharge amount by inducing opposite discharge to improve the luminous efficiency. Can be.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand 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 (8)

A first substrate; A second substrate opposed to the first substrate; A partition wall disposed between the first substrate and the second substrate and defining discharge cells together with the first substrate and the second substrate; First discharge electrodes disposed in one direction in the partition wall; Second discharge electrodes spaced apart from the first discharge electrode and disposed in the partition wall and disposed to face the first discharge electrode with respect to the center of each discharge cell; Address electrodes intersecting the first discharge electrodes and the second discharge electrodes; Floating electrodes disposed between any one of the first discharge electrodes and the second discharge electrodes and the address electrodes; And And a phosphor layer disposed in the discharge cell. The method of claim 1, And the address electrodes are disposed on one of the first substrate and the second substrate, and further comprising a first dielectric layer covering the address electrodes. The method of claim 2, And the floating electrodes are disposed on the first dielectric layer and further include a second dielectric layer covering the floating electrodes. The method of claim 1, And the address electrode is disposed to correspond to the non-discharge area of the discharge cell, and the address electrode includes a protrusion protruding into the discharge cell. The method of claim 4, wherein And the protrusion of the address electrode is further adjacent to any one of the adjacent first discharge electrode and the second discharge electrode. The method of claim 4, wherein And the floating electrode has a shape corresponding to the protruding portion of the address electrode. The method of claim 4, wherein And the light generated in the discharge cells passes through a substrate on which the address electrodes of the first substrate and the second substrate are disposed and is extracted to the outside. The method of claim 1, And a protective layer disposed on at least part of a side surface of the partition wall.

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