KR20050111908A - Plasma display panel - Google Patents

Abstract

The present invention discloses a plasma display panel. According to the invention, the upper substrate; An upper dielectric layer formed on the upper substrate; A lower substrate disposed to face the upper substrate; A lower dielectric layer opposite the upper dielectric layer and formed on the lower substrate; Barrier ribs formed between the upper substrate and the lower substrate and partitioned into discharge cells; A phosphor layer disposed for each discharge cell; A transparent electrode embedded in an upper dielectric layer, each having an inlet portion having a long gap at one end and a protrusion having a short gap at both sides of the inlet portion, and a bus electrode connected to the other end of the transparent electrodes, respectively; Sustain electrode pairs each having a pair of X and Y electrodes disposed in the discharge cell; The center line along the extended direction is embedded in the lower dielectric layer and extends in a direction intersecting with the transparent electrodes disposed in the discharge cell so that an area overlapping the transparent electrodes is maximized. Address electrodes disposed to deviate from the substrate;

Description

Plasma display panel {Plasma display panel}

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

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

The plasma display panel is classified into a direct current type, an alternating current type, or a hybrid type according to a driving method. And, depending on the electrode structure, it is divided into having at least two electrodes required for discharge and having three electrodes. In the case of the DC type, an auxiliary electrode is added to induce an auxiliary discharge. In the case of an AC type, an address electrode is introduced to separate the address discharge and the sustain discharge to improve the address speed. In addition, the AC type may be classified into a counter electrode structure and a surface discharge electrode structure according to the arrangement of the electrodes for discharging. In the case of the counter electrode structure, two sustain electrodes forming a discharge are respectively formed on the substrates. The surface discharge type electrode structure is a structure in which the discharge is formed on one plane of the substrate by placing two sustain electrodes forming the discharge on the same substrate.

1 shows a cross-sectional structure of a unit discharge cell provided in a conventional plasma display panel.

Referring to the drawings, in the discharge cell 10, the lower surface of the upper substrate 11 is formed with a sustain electrode pair 12 consisting of an X electrode 13 and a Y electrode 14 spaced apart from each other by a discharge gap therebetween. have. The X electrode 13 and the Y electrode 14 serve as the common electrode and the scan electrode, respectively. The X electrode 13 and the Y electrode 14 are each provided with bus electrodes 13b and 14b formed on the transparent electrodes 13a and 14a and their lower surfaces to apply a voltage. The sustain electrode pair 12 is embedded by an upper dielectric layer 15, and a protective layer 16 is formed on a lower surface of the upper dielectric layer 15.

The lower substrate 21 is disposed to face the upper substrate 11, and the address electrode 22 is formed on the lower substrate 21. The address electrode 22 is embedded by the lower dielectric layer 23. The phosphor layer 24 is formed of a fluorescent material on the lower dielectric layer 23. On the other hand, the discharge gas is inject | poured into the discharge cell 10 comprised in this way.

The operation of the plasma display panel with the discharge cells 10 having the above structure will be briefly described as follows.

First, when an address discharge voltage is applied between the address electrode 22 and the Y electrode 14, an address discharge occurs. Thus, a predetermined wall charge is formed in the addressed discharge cell 10. In this state, when the sustain discharge voltage is applied between the X electrode 13 and the Y electrode 14, the sustain discharge occurs. The charges generated by such a discharge collide with the discharge gas, and thus plasma is formed to generate ultraviolet rays. The phosphor layer 24 is excited by the generation of such ultraviolet rays, thereby displaying an image.

On the other hand, the pair of sustain electrodes contributing to the sustain discharge may be of a structure as shown in FIG.

As shown, in the X electrode 13 and the Y electrode 14 of the sustain electrode pair 12, the transparent electrodes 13a and 14a respectively connected to the bus electrodes 13b and 14b are divided. It consists of a structure arrange | positioned with the partition 25 in between. This structure has the advantage of reducing circuit current and increasing luminous efficiency. The discharge by the sustain electrode pair 12 configured as described above is initiated in the discharge gap g between the transparent electrodes 13a and 14a and diffused into the entire discharge cell 10.

By the way, in order for the discharge initiated from the discharge gap g to be effectively diffused into the entire discharge cell 10, the discharge should be initiated over a wide area, but as shown, the discharge gap g is formed at regular intervals. There is a problem that the initiation of the discharge occurs locally and the diffusion of the discharge is not smoothly performed. This is because when a voltage is applied to the bus electrodes 13b and 14b to cause a discharge, a totally uniform electric field is not formed in the transparent electrodes 13a and 14a, thereby contributing to the discharge. This is because fewer unnecessary portions are added to the transparent electrodes 13a and 14a. This unnecessary portion not only lowers the discharge efficiency in the discharge cell 10, but also covers a substantial portion of the discharge cell 10, thereby reducing the luminance.

In order to solve this problem, there is an example in which the discharge gap is formed of a short gap and a long gap by partially deleting each of the end centers of the transparent electrodes, but in this case, the end centers of the transparent electrodes are deleted. Therefore, the area where address discharge is performed between the transparent electrode and the address electrode is reduced. Therefore, there is a problem in that the address discharge voltage must be increased to compensate for this.

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 low voltage driving and improving discharge efficiency even if the area of the address electrode is reduced.

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

An upper substrate;

An upper dielectric layer formed on the upper substrate;

A lower substrate disposed to face the upper substrate;

A lower dielectric layer facing the upper dielectric layer and formed on the lower substrate;

Barrier ribs formed between the upper substrate and the lower substrate and partitioned into discharge cells;

A phosphor layer disposed for each discharge cell;

Transparent electrodes embedded in the upper dielectric layer, each having an inlet portion forming a long gap at one end and a protrusion portion forming a short gap at both sides of the inlet portion, and a bus electrode connected to the other end of the transparent electrodes. Sustain electrode pairs each provided with a pair of X and Y electrodes disposed in the discharge cell;

The center line of the transparent electrode is embedded in the lower dielectric layer and extends in a direction crossing the transparent electrodes disposed in the discharge cell, so that an area overlapping the transparent electrodes is maximized. And address electrodes disposed to deviate from the center line.

Here, the address electrode is preferably disposed to include a short gap region of the transparent electrode.

Here, it is preferable that the discharge cells partitioned by the partitions each have an octagonal structure.

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

3 is an exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 4 is a plan view showing a state in which sustain electrode pairs and address electrodes are arranged in FIG. 3.

In the illustrated plasma display panel 100, an upper substrate 111 on which an image is displayed and a lower substrate 131 disposed to face the upper substrate 111 are provided. A plurality of sustain electrode pairs 121 are arranged on the surface of the upper substrate 111 facing the lower substrate 131. The sustain electrode pair 121 may include an X electrode 122 and a Y electrode 125, and the X electrode 122 and the Y electrode 125 may serve as a common electrode and a scan electrode, respectively.

The X-electrode 122 and the Y electrode 125 are connected to one side of the transparent electrodes 123 and 126 and the transparent electrodes 123 and 126 to connect the bus electrodes 124 and 127. Equipped. The transparent electrodes 123 and 126 are formed of indium tin oxide (ITO), which is a transparent conductor to transmit visible light. In addition, the bus electrodes 124 and 127 apply voltages to the transparent electrodes 123 and 126, respectively, and the electric power of the transparent electrodes 123 and 126 formed of ITO having relatively low electrical conductivity. In order to improve the resistance, it is formed of a metal having excellent conductivity such as silver (Ag) or copper (Cu). The X electrode 122 and the Y electrode 125 will be described in more detail later.

An upper dielectric layer 112 is formed on the upper substrate 111 to cover the sustain electrode pairs 121, and the upper dielectric layer 112 is covered by a protective layer 113 such as MgO. .

In the second substrate 131 facing the upper substrate 111, the address electrodes 132 intersect the sustain electrode 121 on the surface facing the upper substrate 111 and are formed in a stripe shape. The address electrodes 132 are covered by a lower dielectric layer 133 and buried therein, and a partition wall 134 is formed between the address electrodes 132 at an upper portion of the lower dielectric layer 133 to form a plurality of discharge cells ( 135). The partition 134 prevents cross talk with adjacent discharge cells 135.

Phosphor is coated on the inner surface of the partition 134 and the upper surface of the lower dielectric layer 133 surrounded by the partition 134 to form the phosphor layer 137. The color of the phosphor is divided into red, green, and blue to implement a color, and forms a phosphor layer 137 of red, green, and blue according to the color of the phosphor.

Meanwhile, the discharge cells partitioned by the partition wall may be formed in various forms, for example, a stripe type, a matrix type, a delta type, or the like, depending on the structure of the partition wall. The discharge cell 135 according to the embodiment of the present invention may have an octagonal shape. Consists of In more detail, the discharge cells 135 are continuously arranged in an octagonal shape, and a non-discharge area 136 is disposed around the discharge cells 135. The non-discharge region 136 corresponds to a region where no discharge occurs because no separate voltage is applied, and is provided between the discharge cells 135 arranged along the direction in which the address electrode 132 is formed.

4, the X electrode 122 and the Y electrode 125 forming the sustain electrode pair 121 are discharge cells from both edges of the discharge cell 135, as shown in FIG. 4. The lead electrodes 132 are respectively spaced apart from each other at predetermined intervals, and the address electrodes 132 are disposed to intersect the X electrodes 122 and the Y electrodes 125.

In addition, the discharge cells 135 are filled with a discharge gas in which neon (Ne), xenon (Xe) and the like are mixed, and in the state where the discharge gas is filled as described above, the upper and lower substrates 111 and 131 of the discharge cells 135 are filled. The upper and lower substrates 111 and 131 are sealed and bonded to each other by a sealing member such as frit glass formed at the edge thereof.

Meanwhile, the X electrode 122 and the Y electrode 125 have a structure in which discharge stability is secured while maximizing emission luminance and discharge efficiency, corresponding to the aforementioned barrier rib structure 134.

As illustrated, the X electrode 122 includes transparent electrodes 123 spaced apart from each other and disposed for each discharge cell 135, and bus electrodes 124 connected to one side of the transparent electrodes 123. Similarly, the Y electrode 125 is spaced apart from each other, and the transparent electrodes 126 and the transparent electrodes 126 of the X electrode 122 are disposed for each of the discharge cells 135, respectively, and the transparent electrode 126. The bus electrode 127 connected to one side of the field is provided. The bus electrodes 124 and 127 extend in directions crossing the address electrodes 132, respectively, and are disposed in discharge cells 135 arranged in a direction orthogonal to the direction in which the address electrodes 132 extend. The transparent electrodes 123 and 126 are connected to each other. The bus electrodes 124 and 127 may be disposed in the non-discharge area 136 or an area close thereto to increase the opening ratio of the panel 100, but is not limited thereto.

Bus electrodes 124 and 127 are connected to one end of the transparent electrodes 123 and 126, and the other end of the transparent electrodes 123 and 126 is disposed to protrude into the discharge cell 135. . Since the end portions of the transparent electrodes 123 and 126 to which the bus electrodes 124 and 127 are connected have a small contribution to the discharge, the edges of the transparent electrodes 123 and 126 are increased from the center of the side portions of the transparent electrodes 123 and 126. It may be preferable that the width is gradually narrowed to the end where the bus electrodes 124 and 127 are connected.

The transparent electrode 123 of the X electrode 122 and the transparent electrode 126 of the Y electrode 125, which are disposed at each discharge cell 135, face each other, and the transparent electrodes 123 and 126 face each other. Leading portions 123a and 126a and protrusions 123b and 126b are provided at the end portions, respectively, to form symmetry.

The lead portions 123a and 126a are formed at the centers of the transparent electrodes 123 and 126, respectively, to form a long gap G1, and the protrusions 123b and 126b are formed of the transparent electrode ( It is formed on both edges of the (123) 126 to form a short gap (Sg) shorter than the long gap (Lg). As shown, the lead portions 123a and 126a and the protrusions 123b and 126b are formed to be curved and connected, respectively, and the remaining portions of the transparent electrodes 123 and 126 are formed in a substantially curved shape. It is. In addition, the transparent electrodes 123 and 126 are formed with inlet portions 123a and 126a and protrusions 123b and 126b to be symmetrical with respect to the center thereof. On the other hand, since only the lead portion of the transparent electrode may be formed to have a predetermined curvature and the remaining portion may be formed in a straight line, the structure is not necessarily limited to the illustrated structure.

As the transparent electrodes 123 and 126 are formed as described above, in the discharge mechanism in which the sustain discharge starts in the short gap Sg and spreads out to the long gap Lg, the discharge cell diffuses into the entire discharge cell 135. The lead portions 123a and 126a forming the long gap Lg concentrate the discharge in the center to achieve stable discharge, and the protrusions 123b and 126b forming the short gap Sg lower the discharge starting voltage. It becomes possible.

Meanwhile, the width of the address electrode 132 is generally set smaller than the width of the transparent electrodes 123 and 126. In this case, as described above, as the inlet portions 123a and 126a are formed at the centers of the ends of the transparent electrodes 123 and 126, the area at the center of the transparent electrodes 123 and 126 is reduced. Address discharge may be disadvantageous. This is because address discharge is performed between the address electrode 132 and the transparent electrodes 123 and 126 as the address electrode 132 is disposed at the center of the inlets 123a and 126a of the transparent electrodes 123 and 126. This is because the area becomes smaller.

In order to solve this problem, according to an embodiment of the present invention, as shown in FIG. 4, the address electrode 132 and the transparent electrodes 123 and 126 positioned on the address electrode 132 are the address electrodes. The center line A of 132 is disposed to cross the center line B of the transparent electrodes 123 and 126 by a predetermined distance apart. That is, the address electrode 132 is disposed to move away from the center of the inlets 123a and 126a of the transparent electrodes 123 and 126 to the protrusions 123b and 126b, and includes a short gap Sg region. In this case, the overlapping area between the address electrode 132 and the transparent electrodes 123 and 126 may be increased. Accordingly, the address electrodes 132 and the transparent electrodes 123 and 126 may be disposed to have a maximum overlapping area. As the overlapping area between the address electrodes 132 and the transparent electrodes 123 and 126 increases as described above, when the widths of the address electrodes 132 are the same, the address discharge voltage may be lowered, and the same address discharge may be obtained. Under voltage conditions, the width of the address electrode 132 may be reduced. When the width of the address electrode 132 is reduced in this manner, the current flowing through the address electrode 132 is reduced, thereby reducing power consumption.

The effect as described above is the width of the address electrode when the center line of the address electrode is spaced apart from the center line of the transparent electrode as an embodiment of the present invention, and when the center line of the address electrode is aligned with the center line of the transparent electrode as a comparative example. It can be confirmed from the experimental results comparing the address discharge voltage according to the In this embodiment, as shown in FIG. 4, the center line of the address electrode is spaced apart from the center line of the transparent electrode so that the edge line of the address electrode passes through the apex of the protrusion. The maximum width along the extending direction of the bus electrode in the transparent electrode was set to 290 µm, the length protruding from the bus electrode to 365 µm, the long gap to 95 µm, and the short gap to 75 µm, respectively.

Referring to the graph of FIG. 4, when the widths of the address electrodes are the same, it can be seen that the address discharge voltage according to the embodiment of the present invention is lower than the address discharge voltage according to the comparative example, and the address discharge voltage is the same. In this case, it can be seen that the width of the address electrode according to the embodiment of the present invention is smaller than the width of the address electrode according to the comparative example.

As described above, according to the present invention, as the overlapping area between the address electrode and the transparent electrode is increased, the address discharge voltage can be lowered when the widths of the address electrodes are the same, so that the discharge efficiency can be improved. Further, under the same address discharge voltage condition, the width of the address electrode can be reduced, so that an effect of reducing power consumption 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.

1 is a cross-sectional view showing a conventional unit discharge cell.

FIG. 2 is a partial plan view illustrating a state in which the storage electrode pairs of FIG. 1 are disposed. FIG.

3 is a partially separated perspective view illustrating a plasma display panel according to an embodiment of the present invention.

FIG. 4 is a partial plan view of the sustain electrode pairs and the address electrodes of FIG. 3.

FIG. 5 is a graph illustrating an address discharge voltage according to a width of an address electrode in an embodiment and a comparative example according to the present invention.

<Brief description of the major symbols in the drawings>

111.Top substrate 112.Top dielectric layer

121..holding electrode pair 122..X electrode

123,126 .. transparent electrode 123a, 126a ..

123b, 126b..Protrusion 124,127..Bus electrode

125 Y electrode 131 lower substrate

132. Address electrode 133. Lower dielectric layer

134. Bulkhead 135. Discharge cell

136. Phosphor layer Lg .. long gap

Sg .. short gap

Claims (10)

An upper substrate; An upper dielectric layer formed on the upper substrate; A lower substrate disposed to face the upper substrate; A lower dielectric layer facing the upper dielectric layer and formed on the lower substrate; Barrier ribs formed between the upper substrate and the lower substrate and partitioned into discharge cells; A phosphor layer disposed for each discharge cell; Transparent electrodes embedded in the upper dielectric layer, each having an inlet portion forming a long gap at one end and a protrusion portion forming a short gap at both sides of the inlet portion, and a bus electrode connected to the other end of the transparent electrodes. Sustain electrode pairs each provided with a pair of X and Y electrodes disposed in the discharge cell; The center line of the transparent electrode is embedded in the lower dielectric layer and extends in a direction crossing the transparent electrodes disposed in the discharge cell, so that an area overlapping the transparent electrodes is maximized. And an address electrode disposed to deviate from the center line. The method of claim 1, And the address electrode is arranged to include a short gap region of the transparent electrode. The method of claim 1, And the inlet portion is curved to have a predetermined curvature. The method of claim 3, wherein And the protrusion is curved to have a predetermined curvature. The method of claim 4, wherein And the address electrode is arranged such that an edge line coincides with a vertex of the protrusion. The method of claim 1, And the discharge cells partitioned by the barrier ribs each having an octagonal structure. The method of claim 6, And a non-discharge area is provided between each of the discharge cells arranged along the direction in which the address electrode extends. The method of claim 7, wherein And the bus electrode is disposed in the non-discharge area. The method of claim 1, And the transparent electrode is formed such that its width gradually narrows from the side center to an end portion of the transparent electrode connected to the bus electrode. The method of claim 1, And a protective layer is formed on the lower surface of the upper dielectric layer.