KR100626028B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel according to the present invention comprises: a lower substrate; Address electrodes spaced apart from each other on an upper surface of the lower substrate; A lower dielectric layer formed to cover the address electrodes; Barrier ribs having vertical barrier ribs formed on the lower dielectric layer, the parallel barrier ribs extending in parallel with the address electrodes therebetween; A phosphor layer disposed in discharge spaces between the vertical partition walls; An upper substrate facing the lower substrate, the upper substrate having recesses formed on lower surfaces of the lower substrate to correspond to the discharge spaces; Each of the grooves is disposed so as to be spaced apart from each other, and at least one side of each of the grooves is disposed along the shape of the groove, and has a pair of X and Y electrodes respectively extending in a direction crossing the address electrodes. Sustain electrode pairs; M electrodes spaced apart from each other between the X electrode and the Y electrode and disposed in the recesses, respectively; And an upper dielectric layer formed to cover the sustain electrode pairs and the M electrodes.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a plasma display panel according to a conventional example.

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

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

<Brief description of the major symbols in the drawings>

111.Top substrate 112.Top dielectric layer

121. Lower substrate 122. Address electrode

123. Lower dielectric layer 124 Bulkhead

127 phosphor layer 128 discharge cell

131..Keep electrode pair 132..X electrode

135..Y electrode 141..M electrode

150..groove

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure to lower a driving voltage and improve discharge efficiency.

In general, a plasma display panel applies a predetermined voltage to an electrode while a gas is charged between electrodes provided in an enclosed space so that a glow discharge occurs, and a predetermined pattern is generated by ultraviolet rays generated during discharge. The phosphor layer thus formed is excited to form an image.

The plasma display panel is classified into a direct current type or an alternating current type according to a driving method. In the case of the direct current type, an auxiliary electrode is added to induce the auxiliary discharge. In the case of the alternating current type, an address electrode is introduced to separate the address discharge and the sustain discharge to improve the address speed. The alternating current type may be classified into a counter discharge electrode structure and a surface discharge electrode structure according to the arrangement of the electrodes for discharging. In the case of the counter discharge electrode structure, two sustain electrodes forming a discharge are respectively formed on the substrates. In the surface discharge type electrode structure, the discharge is formed on the plane of the substrate by placing two sustain electrodes forming the discharge on the same substrate.

1 shows an example of an AC plasma display panel having a conventional surface discharge type 3-electrode structure.

The illustrated plasma display panel 10 includes an upper substrate 11 on which an image is displayed and a lower substrate 21 disposed so as to face the upper substrate 11 in parallel.

On the lower surface of the upper substrate 11, sustain electrode pairs 12 including the common electrode 13 and the scan electrode 14 are formed. The common electrode 13 and the scan electrode 14 are spaced apart from each other by a discharge gap g. Here, the common electrode 13 is composed of a common transparent electrode 13a and a common bus electrode 13b formed on a lower surface thereof. Similarly, the scan electrode 14 also includes a scan transparent electrode 14a and a lower surface thereof. The formed scan bus electrode 14b is formed. The sustain electrode pairs 12 are buried in the upper dielectric layer 15, and a passivation layer 16 is formed on the lower surface of the upper dielectric layer 15.

The lower substrate 21 is disposed to face the upper substrate 11, and the address electrodes 22 are formed to intersect the storage electrode pairs 12 on the upper surface of the lower substrate 21. . The address electrodes 22 are embedded by the lower dielectric layer 23. On the upper surface of the lower dielectric layer 23, partition walls 24 including vertical partitions 24a and horizontal partitions 24b intersecting with each other are formed and partitioned into matrix discharge cells 25. Here, the partition wall 24 is formed such that regions where the sustain electrode pair 12 and the address electrode 22 cross each other may correspond to the discharge cells 25, respectively. The discharge cells 25 are formed of phosphors selected from red, green, and blue phosphors for color implementation, and are filled with discharge gas.

In the plasma display panel 10 configured as described above, the storage electrode pairs 12 may have various types of structures. As an example, according to the structure shown in FIG. 1, the common transparent electrode 13a of the common electrode 13 constituting the sustain electrode pair 12 and the scan transparent electrode 14a of the scan electrode 14 are strips. Each of the common and scan transparent electrodes 13a and 14a is disposed to form a discharge gap g in the discharge cells 25. As described above, the discharge between the common and scan transparent electrodes 13a and 14a starts from the discharge gap g and diffuses into the entire discharge cell 25.

By the way, in order for the discharge initiated from the discharge gap g to diffuse effectively into the entire discharge cell 25, it is preferable that the initiation of discharge occurs over a wide area, but as shown, the discharge gap g is spaced at a constant interval. In this case, there is a problem that the start of discharge occurs locally and the spread of the discharge is not smoothly performed. This is because when a voltage is applied to the common and scan bus electrodes 13b and 14b to cause a discharge, an electric field is not formed in the common and scan transparent electrodes 13a and 14a as a whole. This is because unnecessary portions that contribute little to the number of common and scan transparent electrodes 13a and 14a are increased. On the other hand, when the discharge gap g is made larger, the discharge efficiency is increased, and thus the discharge start voltage is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel capable of driving low voltage and improving discharge efficiency by improving the structure of electrodes for performing discharge.

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

A lower substrate;

Address electrodes spaced apart from each other on an upper surface of the lower substrate;

A lower dielectric layer formed to cover the address electrodes;

Barrier ribs having vertical barrier ribs formed on the lower dielectric layer to extend in parallel with the address electrodes therebetween;

A phosphor layer disposed in discharge spaces between the vertical partition walls;

An upper substrate facing the lower substrate and having recesses formed on lower surfaces thereof corresponding to the discharge spaces;

Each of the grooves is disposed so as to be spaced apart from each other, and at least one side of each of the grooves is disposed along the shape of the grooves, and the pair of X electrodes and Y electrodes respectively extending in a direction crossing the address electrodes is provided as a pair. Sustain electrode pairs each provided;

M electrodes spaced apart from each other between the X electrode and the Y electrode, and disposed in the recessed portions, respectively;

And an upper dielectric layer formed to cover the sustain electrode pairs and the M electrodes.

Herein, the X electrode includes X transparent electrodes arranged to correspond to each space between the vertical partition walls and X bus electrodes connected to one side of the X transparent electrodes, and the Y electrode includes the X transparent electrodes. And Y transparent electrodes spaced apart from each other and spaced apart to correspond to spaces between the vertical partition walls and Y bus electrodes connected to one side of the Y transparent electrodes.

Here, it is preferable that the X transparent electrode and the Y transparent electrode are disposed to have a predetermined length along the inner surface of the recess.

Herein, the M electrode preferably includes M transparent electrodes arranged in correspondence with spaces between the vertical partition walls and M bus electrodes connected to the M transparent electrodes.

Here, the M transparent electrode is preferably disposed on the inner surface of the groove portion.

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

2 is an exploded perspective view of the plasma display panel according to an embodiment of the present invention, Figure 3 is a cross-sectional view taken along the line III-III of FIG.

2 and 3, the plasma display panel 100 includes an upper substrate 111 and a lower substrate 121 disposed to face the upper substrate 111. The upper substrate 111 is formed of a transparent material such as glass through which visible light can be transmitted so that an image can be seen. Under the upper substrate 111, sustain electrode pairs 131 and M electrodes 141 according to an embodiment of the present invention are formed. Detailed description thereof will be described later.

The sustain electrode pairs 131 and the M electrodes 141 are covered by an upper dielectric layer 112 formed of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like, and the upper dielectric layer 112 is discharged. It prevents time charged particles from directly colliding with the storage electrode pairs 131 and the M electrodes 141, thereby damaging the storage electrode pairs 131 and the M electrodes 141, and serve to guide the charged particles. .

In addition, a lower surface of the upper dielectric layer 112 may be covered by a protective film 113 formed of MgO, etc. The protective film 113 may have charged particles directly collide with the upper dielectric layer 112 when discharged, and thus the upper dielectric layer 112 may be formed. ), And when charged particles collide with each other, the secondary electrons may be discharged to increase discharge efficiency.

On the upper surface of the lower substrate 121 facing the upper substrate 111, the address electrodes 122 extend in a direction crossing the storage electrode pairs 131, respectively, and are arranged in a stripe shape spaced apart from each other. The address electrodes 122 are covered and embedded by the lower dielectric layer 123, and the partition wall 124 is formed in a predetermined pattern on the lower dielectric layer 123.

The partition wall 124 is limited to discharge spaces in which discharge is performed, thereby preventing cross talk between adjacent discharge spaces.

As shown in FIG. 5, the partition wall 124 may extend in the direction of crossing the vertical partition walls 125 on the same plane as the vertical partition walls 125 and the vertical partition walls 125 extending apart from each other. Horizontal barrier ribs 126 extending apart from each other are provided to limit the discharge cells 128 in a closed structure.

Here, the vertical partitions 125 extend in parallel with the address electrodes 122, respectively, and are formed such that at least one address electrode 122 may be disposed between the vertical partitions 125. As illustrated, one horizontal partition wall 126 may be formed of first and second horizontal partition walls 126a and 126b spaced apart from each other to form a space therebetween. In this case, an area including the space between the first and second horizontal partitions 126a and 126b corresponds to a non-discharge area, and the space between the first and second horizontal partitions 126a and 126b serves as an exhaust passage. You can also do On the other hand, the partition wall is not limited to the above, it may be made of a structure of various forms, such as a stripe shape in which the horizontal partition walls are omitted.

In the discharge cells 128 defined by the partition wall 124 having the above structure, a discharge gas in which Ne, Xe, and the like are mixed is filled, and the phosphor layer emits visible light by being excited by ultraviolet rays generated during discharge. 127 are disposed respectively. Here, the phosphor layer 127 may be formed over the side surface of the partition wall 124 and the lower dielectric layer 123 defined by the partition wall 124, as shown.

The phosphor layer 127 may be formed of any one phosphor selected from among red, green, and blue phosphors for color implementation, and thus, red, green, and blue phosphor layers 127R, 127G, and 127B. Can be classified. The red phosphor layer 127R includes phosphors such as Y (V, P) O ₄ : Eu, and the like, and the green phosphor layer 127G includes phosphors such as Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the like. The blue phosphor layer 127B may be formed to include a phosphor such as BAM: Eu.

The red discharge cell 128R on which the red phosphor layer 127R is disposed is a red subpixel, and the green discharge cell 128G on which the green phosphor layer 127G is disposed is a green subpixel, and the blue phosphor layer 127B is disposed. ), The blue discharge cells 128B are arranged as a blue subpixel, and the red subpixel, the green subpixel, and the blue subpixel form a unit pixel to form a unit pixel. It will express the color.

Meanwhile, according to one feature of the present invention, recesses 150 formed in a concave shape with a predetermined curvature are formed on the lower surface of the upper substrate 111, and the recesses 150 are formed in the discharge cells 128. It is arranged to correspond to each other. Here, one groove 150 may be continuously formed to correspond to the entire discharge cells 128 arranged in a line along the direction in which the horizontal partition wall 126 extends. In this case, the groove portion The width of 150 is set to be equal to or less than the width of the discharge cell 128 corresponding thereto. However, the present invention is not limited thereto, and one recess may be formed discontinuously to correspond to each of the discharge cells arranged in a line along the direction in which the horizontal partition wall extends. It is set below the size of the cell. The grooves 150 may be formed by an etching process or the like.

On the lower surface of the upper substrate 111 on which the recesses 150 are formed, sustain electrode pairs 131 formed by pairing the X electrode 132 and the Y electrode 135 are disposed. As described above, the X electrode 132 and the Y electrode 135 forming one sustaining electrode pair 131 are disposed on both sides of the recess 150 to be spaced apart from each other. At least one side of the X electrode 132 and at least one side of the Y electrode 135 are disposed in the recess 150 along the shape of the recess 150.

In more detail, as shown in the drawing, the X electrode 132 is formed on the bottom surface of the upper substrate 111 by being separated from the X transparent electrodes 133, and the X transparent electrodes 133 are connected to the discharge cell. The X bus electrode 134 extends in the direction crossing the address electrode 122 at the edges of the 128, and likewise, the Y electrode 135 is also formed on the lower surface of the upper substrate 111 by being spaced apart from each other. The transparent electrodes 136 and the Y transparent electrodes 136 are connected to each other and have a Y bus electrode 137 extending in a direction crossing the address electrode 122 at the edges of the discharge cells 128.

Here, the X transparent electrodes 133 have predetermined widths and lengths, respectively, and at least a portion of the X transparent electrodes 133 are disposed to be inserted into the recesses 150, and likewise, the Y transparent electrodes 136 are each predetermined widths and lengths. At least a portion thereof has a lead drawn into the recess 150. That is, as shown, each of the X transparent electrode 133 and each of the Y transparent electrode 136 introduced into the groove 150 is disposed along the inner surface of the groove 150, respectively, X transparent The opposite ends of the electrode 133 and the Y transparent electrode 136 are spaced apart.

Portions of the X transparent electrode 133 and the Y transparent electrode 136 may be withdrawn from the recess 150 and disposed at the edge of the discharge cell 128, respectively. The X bus electrode 134 and the Y bus electrode 137 may be disposed and connected to ends of the X transparent electrode 133 and the Y transparent electrode 136 disposed at each other. In this case, the X bus electrode 134 and the Y bus electrode 137 may be disposed to correspond to the horizontal partition walls 126 corresponding to the non-discharge area to increase the aperture ratio of the panel 100.

For example, as illustrated, when the horizontal barrier ribs 126 include the first and second horizontal barrier ribs 126a and 126b, respectively, spaced apart from each other, the two pairs of storage electrode pairs 131 are disposed adjacent to each other. The X bus electrode 134 and the Y bus electrode 137 may be divided and disposed on the first horizontal barrier rib 126a and the second horizontal barrier rib 126b. Meanwhile, the X bus electrode 134 and the Y bus electrode 137 may include a black layer in order to absorb external light and improve contrast, and the black layer may include ruthenium (Ru), cobalt (Co), and manganese. (Mn) or the like.

As described above, the X transparent electrodes 133 and the Y transparent electrodes 136 disposed in the center region of the discharge cells 128 transmit visible light emitted from the phosphor layer 127 through the upper substrate 111. In order not to interfere, it may be desirable to be formed of a transparent material such as indium tin oxide (ITO). The X bus electrode 134 and the Y bus electrode 137 supply the voltages applied from the driver to the X transparent electrodes 133 and the Y transparent electrodes 136, respectively, and thus, the X bus electrodes 134. ) And the Y bus electrode 137 are metals having excellent conductivity such as silver (Ag) or copper to improve the electrical resistance of the X transparent electrode 133 and the Y transparent electrode 136 formed of ITO having relatively low electrical conductivity. It will be preferred to be formed of (Cu) or the like.

As described above, the X transparent electrode 133 and the Y transparent electrode 136 have a structure in which the X transparent electrode 133 and the Y transparent electrode 136 are inserted into the recess 150 at a predetermined length along the inner surface of the recess 150. An angle formed between the transparent electrode 133 and the Y transparent electrode 136 may be smaller than 180 °. That is, according to the present invention, a V-type discharge can be performed between the X transparent electrode 133 and the Y transparent electrode 136, and thus the angle between the X transparent electrode 133 and the Y transparent electrode 136 is achieved. Compared to the surface discharge structure of 180 °, low voltage driving can be enabled.

In the X electrode 132 and the Y electrode 135 having the above structure, the M electrode 141 is disposed between the X electrode 132 and the Y electrode 135 so that the sustain discharge therebetween can be easily initiated. ) Is provided. That is, the M electrode 141 is disposed in the recess 150 and spaced apart from each other between the X electrode 132 and the Y electrode 135.

The M electrode 141 serves to initiate sustain discharge with the X electrode 132 or the Y electrode 135, and the M electrode 141 is disposed between the X electrode 132 and the Y electrode 135. As a result, the distance from the M electrode 141 to the X electrode 132 or the Y electrode 135 may be relatively shorter than the distance between the X electrode 132 and the Y electrode 135. Can be facilitated. The M electrode 141 may not only serve to initiate sustain discharge but also serve to perform address discharge together with the address electrode 122, thereby contributing to increasing discharge efficiency.

In more detail, the M electrode 141 is formed on the lower surface of the upper substrate 111 and is separated from each other, and the M transparent electrodes 142 and the M transparent electrodes 142 filled with the upper dielectric layer 112 are formed. The M bus electrode 143 is connected to each other. The M bus electrode 143 may have a predetermined width across the center of the M transparent electrodes 142 and extend in parallel with the X bus electrode 134 and the Y bus electrode 137.

The M transparent electrodes 142 connected to the M bus electrodes 143 are disposed at the centers of the inner surfaces of the recesses 150, and each of the M transparent electrodes 142 is the X transparent electrode 133 and the Y transparent electrode. The transparent electrodes 136 are spaced apart from each other. That is, the X transparent electrode 133 and the M transparent electrode 142, and the Y transparent electrode 136 and the M transparent electrode 142 are spaced apart at substantially constant intervals, respectively, the X transparent electrode 133 ) And a short gap relatively shorter than the long gap between the Y transparent electrode 136. On the other hand, the shape of the M transparent electrode is not necessarily limited to the above.

As described above, the M transparent electrodes 142 disposed in the center region of the discharge cells 128 may be formed of a material such as ITO such that visible light emitted from the phosphor layer 127 does not prevent transmission of the visible light through the upper substrate 111. It will be preferable to form a. In addition, since the M bus electrode 143 supplies voltages applied from the driver to the M transparent electrodes 142, respectively, the M bus electrode 143 may be formed of a metal having excellent conductivity, such as silver or copper.

An operation of the plasma display panel 100 configured as described above is described as an example.

First, when a voltage is applied between the address electrode 122 and the M electrode 141, an address discharge occurs, and as a result of the address discharge, a discharge cell 128 in which sustain discharge occurs is selected. After the address discharge is executed, if the voltage is alternately applied between the M electrode 141 and the X electrode 132 or the M electrode 141 and the Y electrode 135 disposed in the selected discharge cell 128, it is maintained. The discharge is started. After the sustain discharge is started as described above, if the voltage is alternately applied between the X electrode 132 and the Y electrode 135, the sustain discharge occurs over the entire X electrode 132 and the Y electrode 135. Ultraviolet rays are emitted by the sustain discharge, and the emitted ultraviolet rays emit visible light from the phosphor layer 127 by exciting the phosphor layer 127 formed in the discharge cell 128.

As described above, according to the present invention, since the V-type discharge can be performed between the X electrode and the Y electrode, the low voltage driving can be performed and the discharge efficiency can be increased. Further, by providing the M electrode between the X electrode and the Y electrode, the sustain discharge can be easily started and the effect of lowering the discharge start voltage can be 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 (10)

A lower substrate; Address electrodes spaced apart from each other on an upper surface of the lower substrate; A lower dielectric layer formed to cover the address electrodes; Barrier ribs having vertical barrier ribs formed on the lower dielectric layer to extend in parallel with the address electrodes therebetween; A phosphor layer disposed in discharge spaces between the vertical partition walls; An upper substrate facing the lower substrate, the upper substrate having recesses formed in a concave shape with a predetermined curvature on a lower surface thereof corresponding to the discharge spaces; Each of the grooves is disposed so as to be spaced apart from each other, and at least one side of each of the grooves is disposed along the shape of the grooves, and the pair of X electrodes and Y electrodes respectively extending in a direction crossing the address electrodes is provided as a pair. Sustain electrode pairs each provided; M electrodes spaced apart from each other between the X electrode and the Y electrode, and disposed in the recessed portions, respectively; An upper dielectric layer formed to cover the sustain electrode pairs and the M electrodes; The X electrode includes X transparent electrodes arranged to correspond to the spaces between the vertical partition walls and X bus electrodes connected to one side of the X transparent electrodes, and the Y electrode corresponds to the X transparent electrodes, respectively. And Y transparent electrodes spaced apart from each other and correspondingly spaced between the vertical partition walls and Y bus electrodes connected to one side of the Y transparent electrodes. The M electrode includes M transparent electrodes dividedly arranged to correspond to spaces between the vertical partition walls and M bus electrodes connected to the M transparent electrodes. The X transparent electrodes and the Y transparent electrodes are formed along the inner surface of the groove portion, the ends of the transparent electrodes are concave with a predetermined curvature, And the M transparent electrode is formed concave with a predetermined curvature along the inner surface of the groove portion. delete delete delete delete delete The method of claim 1, The X transparent electrode and the Y transparent electrode form a long gap, and the plasma display, wherein the short gap is shorter than the long gap between the X transparent electrode and the M transparent electrode and between the Y transparent electrode and the M transparent electrode. panel. The method of claim 1, The barrier rib further includes horizontal barrier ribs extending in a direction crossing the vertical barrier ribs and spaced apart from each other, and the X bus electrode and the Y bus electrode are disposed on the horizontal barrier ribs, respectively. panel. The method of claim 8, And the horizontal barrier ribs are formed of first and second horizontal barrier ribs spaced apart from each other. The method of claim 1, A lower surface of the upper dielectric layer is further provided with a protective film plasma display panel.

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