KR100592275B1 - 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 formed on the lower substrate so as to face the upper dielectric layer; Barrier ribs partitioning discharge cells between the upper substrate and the lower substrate; A phosphor layer disposed for each discharge cell; A common electrode and a pair of scan electrodes embedded in an upper dielectric layer, each having a base extending in one direction and extending portions protruding from the base into discharge cells, respectively, and extending from the common electrode and the scan electrode. Each of the discharge electrodes is disposed at both sides of the discharge cell at the center and disposed so as to form a discharge gap between side surfaces of the extension parts; Address electrodes embedded in the lower dielectric layer and extending in a direction crossing the sustain electrode pairs, the body having a main body disposed along the center of the discharge cell, and protrusions protruding from the side of the main body toward the scan electrode; Include.

Description

Plasma display panel {Plasma display panel}

1 is a plan view illustrating a state in which sustain electrode pairs and address electrodes are disposed in discharge cells according to the related art.

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 in FIG. 2;

4 is a plan view illustrating a state in which sustain electrode pairs and address electrodes are disposed in discharge cells in FIG. 2;

<Brief description of the major symbols in the drawings>

111.Top substrate 112.Top dielectric layer

121. Lower substrate 122. Lower dielectric layer

123. bulkhead 124 discharge cell

125. Phosphor layer 132. Common electrode

133. Common bus electrode 134 Common electrode

135.Scan electrode 136.Scan bus electrode

137 Scanned electrode 141 Address electrode

143..Protrusion

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure to enable high-speed addressing.

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 (DC) type, an alternating current (AC) type, and a hybrid type according to an applied discharge voltage, and is classified into a counter discharge type and a surface discharge type according to a discharge structure. In the DC plasma display panel, all electrodes are exposed to a discharge space, and charges are directly transferred between the corresponding electrodes. In the AC plasma display panel, at least one electrode is surrounded by a dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the DC plasma display panel, since the charge is directly transferred between the corresponding electrodes, there is a problem in that the electrode is severely damaged. Therefore, an AC plasma display panel having an AC three-electrode surface discharge structure is generally employed. Has been.

In such a plasma display panel, efforts have recently been made to drive a panel at a low voltage in order to reduce power consumption. For example, the sustain electrode of the plasma display panel of Korean Patent Laid-Open Publication No. 2000-15444 shown in FIG.

As shown, partition walls 12 are formed in a stripe shape to partition the discharge cells 11, address electrodes 13 are disposed between the partition walls 12, and the address electrodes 13 are disposed. The sustain electrode pairs 21 are arranged to intersect with each other.

The sustain electrode pair 21 includes a common bus electrode 23 extending in a direction crossing the partition walls 12, a common electrode 22 having a common transparent electrode 24 connected thereto, and a scan bus electrode ( And a scan electrode 25 having a scan transparent electrode 27 connected thereto. In addition, the common transparent electrode 24 includes a base 24a connected to the common bus electrode 23, and extensions 24b protruding from the base 24a into discharge cells 11 at predetermined lengths, respectively. The scan transparent electrode 27 has a base 27a connected to the scan bus electrode 26 and an extension part 27b protruding from the base 27a into discharge cells 11 at predetermined lengths, respectively. Are provided. The extension part 24b of the common transparent electrode 24 and the extension part 27b of the scan transparent electrode 27 are arranged in parallel and spaced apart on both sides with the center between the partition walls 12 as a boundary.

Accordingly, a discharge gap is formed between the side surface of the extension part 24b of the common transparent electrode 24 and the side surface of the extension part 27b of the scan transparent electrode 27, and the extension of the common transparent electrode 24 is performed. Between the protruding end of the part 24b and the base 27a of the scan transparent electrode 27, and the protruding end of the extension part 27b of the scan transparent electrode 27 and the base of the common transparent electrode 24 ( By forming a discharge gap between 24a), the discharge region can be increased, so that discharge can be performed even at a low voltage.

However, as the extension 27b of the scan transparent electrode 27 is disposed on one side of the discharge cell 11, an address discharge is transferred between the extension 27b of the scan transparent electrode 27 and the address electrode 13. The area executed is reduced. Accordingly, there is a problem in that the addressing speed is lowered and address discharge is not performed smoothly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by improving the structure of the address electrode so that an electric field can be concentrated between the scan electrode and the address electrode, a high speed addressing and address discharge can be stably performed. The purpose is.

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 formed on the lower substrate so as to face the upper dielectric layer;

Partition walls partitioning discharge cells between the upper substrate and the lower substrate;

A phosphor layer disposed for each discharge cell;

A pair of common electrodes and scan electrodes embedded in the upper dielectric layer, each having a base extending in one direction and extending portions protruding from the base into the discharge cells, respectively; Extension electrodes of the scan electrodes are disposed on both sides of the discharge cells at the centers thereof, respectively, and sustain electrode pairs are disposed to form discharge gaps between side surfaces of the extension parts;

Embedded in the lower dielectric layer and extending in a direction crossing the sustain electrode pairs, the main body disposed along a center of the discharge cell, and protrusions protruding from the side of the main body toward the scan electrode; Address electrodes;

The protrusions may be disposed to overlap with the extension of the scan electrode.

Here, each of the protrusions is preferably made of a pointed end shape.

Here, the protrusions are preferably arranged on the same plane as the body portion.

Here, it is preferable that a discharge gap is formed between the protruding end of the extension of the common electrode and the base of the scan electrode, and the protruding end of the extension of the scan electrode and the base of the common electrode arranged for each discharge cell. Do.

The base and extension portions of the common electrode and the scan electrode are formed of indium tin oxide (ITO), respectively, and a common bus electrode is connected to the base of the common electrode, and a scan bus electrode is connected to the base of the scan electrode. desirable.

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

2 and 3 illustrate a plasma display panel according to an embodiment of the present invention.

2 and 3, the plasma display panel 100 includes an upper substrate 111 on which an image is displayed and a lower substrate 121 disposed to face the upper substrate 111. A plurality of sustain electrode pairs 131 formed of pairs of the common electrode 132 and the scan electrode 135 are formed on the surface of the upper substrate 111 facing the lower substrate 121.

The common electrode 132 may include a common bus electrode 133 extending in one direction and a common transparent electrode 134 connected thereto. The scan electrode 135 may include a scan bus electrode 136 extending in one direction. A scan transparent electrode 137 connected thereto is provided.

The common transparent electrode 134 and the scan transparent electrode 137 are formed of indium tin oxide (ITO), which is a transparent conductor to transmit visible light. In addition, the common bus electrode 133 and the scan bus electrode 136 apply a voltage to the common transparent electrode 134 and the scan transparent electrode 137, respectively, and the common transparent electrode formed of ITO having relatively low electrical conductivity. In order to improve the electrical resistance of the 134 and the scan transparent electrode 137, it is formed of a metal having excellent conductivity, such as silver (Ag) or copper (Cu).

The common transparent electrode 134 includes a base 134a connected to the common bus electrode 133 and an extension part 134b protruding from the base 134a, and the scan transparent electrode 137. A base 137a connected to the scan bus electrode 136 and an extension part 137b protruding from the base 137a are provided. Meanwhile, in the common transparent electrode and the scan transparent electrode, bases may be omitted, and thus, the common bus electrode and the scan bus electrode may be connected to the ends of the extension portions, respectively.

The sustain electrode pairs 131 configured as described above are covered and embedded by an upper dielectric layer 112 formed on the upper substrate 111, and the upper dielectric layer 112 is formed by a protective layer 113 formed of MgO or the like. Covered.

In the lower substrate 121 facing the upper substrate 111, the address electrodes 141 are formed on the surface facing the upper substrate 111 so as to cross the sustain electrode pairs 131. The address electrode 141 is disposed for each discharge cell 124, and the address electrode 141 extends in the direction crossing the sustain electrode pairs 131 and the body portion 142. Protrusions 143 protruding on the same plane from one side of the. As shown in the figure, the protrusions 143 are each formed in a triangular shape with a sharp end, but are not necessarily limited thereto.

The address electrodes 141 having the above structure are covered and embedded by the lower dielectric layer 122 formed on the lower substrate 121, and the partition wall 123 is formed on the lower dielectric layer 122. Discharge cells 124 are partitioned between the upper substrate 111 and the lower substrate 121.

As shown in the figure, the partition walls 123a are formed to be spaced apart at predetermined intervals and horizontally formed to extend in the direction crossing the vertical partition walls 123a from the side surfaces of the vertical partition walls 123a, respectively. Partition walls 123b. Here, the vertical partitions 123a are disposed parallel to each other with one address electrode 141 interposed therebetween. As the vertical bulkhead 123a and the horizontal bulkhead 123b are formed as described above, the cells are partitioned into discharge cells 124 closed in four surfaces in a matrix form, and cross talk between the discharge cells 124 is performed. Is prevented. When partitioned in the form of a matrix as described above, there is an advantage in that fine pitch, brightness, and efficiency can be increased. On the other hand, the partition wall is not limited to the above, it may be made of a structure such as a stripe shape, a delta shape.

Phosphor layers 125 are disposed in the discharge cells 124 partitioned as described above, and as shown, the phosphor layers 125 have a side surface of the partition wall 123 and an upper surface of the lower dielectric layer 122. It is formed over. The phosphor layer 125 uses red, green, and blue phosphors for color implementation, and may be classified into red, green, and blue phosphor layers according to the color of the phosphor. The discharge cells 124 in which the red, green, and blue phosphor layers are disposed, respectively, form red, green, and blue discharge cells, and they constitute a group to form a unit pixel. The discharge cells 124 are filled with a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed. In the state where the discharge gas is filled, the upper and lower substrates 111 and 121 are sealed to each other by a sealing member such as frit glass formed at edges of the upper and lower substrates 111 and 121.

Meanwhile, as illustrated in FIG. 4, sustain electrode pairs 131 are disposed in the discharge cells 124.

Referring to FIG. 4, in the common electrode 132 and the scan electrode 135 forming the sustain electrode pair 131, the base 134a and the scan of the common transparent electrode 134 to which the common bus electrode 133 is connected are scanned. The base 137a of the scan transparent electrode 137 to which the bus electrode 136 is connected is spaced apart from each other at predetermined intervals and extends in a direction parallel to the horizontal partition wall 123b. Extension portions 134b protrude from the base 134a of the common transparent electrode 134 so as to pass through the centers of the discharge cells 124, respectively, and from the base 137a of the scan transparent electrode 137. The extension portions protrude so as to pass through the center in the discharge cells 124, respectively.

Here, the extension part 134b of the common transparent electrode 134 and the extension part 137b of the scan transparent electrode 137 are centered at each center of the discharge cells 124, that is, between the vertical partition walls 123a. They are arranged on both sides with the center of the boundary as the boundary. In this case, the side surfaces of the extension part 134b of the common transparent electrode 134 and the side surfaces of the extension part 137b of the scan transparent electrode 137 are disposed to be spaced in parallel to each other so that the common transparent electrodes 134 face each other. The discharge gap is formed between the side surface of the extension portion 134b and the side surface of the extension portion 137b of the scan transparent electrode 137.

The protruding end of the extension portion 134b of the common transparent electrode 134 is spaced apart from the base 137a of the scan transparent electrode 137 disposed in the discharge cell 124 at predetermined intervals. The protruding end of the extension 137b of the transparent electrode 137 is spaced apart from the base 134a of the common transparent electrode 134 disposed in the discharge cell 124 at predetermined intervals, thereby forming a discharge gap.

As such, a discharge gap is formed between the side surface of the extension portion 134b of the common transparent electrode 134 and the side surface of the extension portion 137b of the scan transparent electrode 137, and the extension portion of the common transparent electrode 134 ( A discharge gap is formed between the protruding end of the 134b and the base 137a of the scan transparent electrode 137, and the protruding end of the extension 137b of the scan transparent electrode 137 and the common transparent electrode 134. As the discharge gap is formed between the bases 134a, the discharge region can be increased. Therefore, discharge can occur even at a low voltage. In addition, the common transparent electrode 134 and the scan transparent electrode 137 have a structure in which portions corresponding to the vertical partitions 123a are partially removed, thereby reducing circuit current and thus reducing power consumption.

The address electrode 141 is disposed below the common electrode 132 and the scan electrode 135 arranged in parallel with the vertical partition wall 123a so as to intersect them. The main body 142 of the address electrode 141 is disposed along the center between the vertical partitions 123a, and the protrusions 143 are scanned from one side of the main body 142 by the scan common electrode 137. It protrudes toward the extension part 137b of. Here, the pointed end of the protrusion 143 is disposed to protrude to the outer edge surface of the extension part 137 via the extension part 137b of the scan common electrode 137 and thus, at the top of the upper substrate 111. When viewed, the protrusions 143 and the extension 137b of the scan common electrode 137 overlap with each other. Accordingly, the area where the address discharge is performed between the address electrode 141 and the scan electrode 135 can be increased as compared with the conventional art shown in FIG. In addition, since the end portions of the protrusions 143 provided on the address electrode 141 are each made of a pointed triangular shape, the electric field concentration effect can also be maximized, so that stable address discharge can be achieved, and high-speed addressing is possible. .

Referring to the driving of the plasma display panel 100 configured as described above is as follows.

First, when an address discharge voltage is applied between the address electrode 141 and the scan electrode 135, an address discharge occurs. In this case, since the protrusions 143 provided on the address electrode 141 are disposed to protrude toward the scan electrode 135, they are addressed at a high speed and the address discharge is more stable. As the address discharge occurs as described above, a predetermined wall charge is formed in the addressed discharge cell 124. In this state, when the sustain discharge voltage is applied between the common electrode 132 and the scan electrode 135, a sustain discharge occurs. do. In addition, the charges generated by the discharge collide with the discharge gas, thereby forming a plasma to generate ultraviolet rays. The generated ultraviolet rays excite the phosphor layer 125, and thus an image is displayed through the upper substrate 111.

As described above, according to the present invention, in the structure in which the common electrode and the scan electrode are disposed on both sides of the discharge cell in the direction in which the address electrode extends, the protrusions protruding toward the scan electrode are provided in the address electrode. The addressing can be performed at high speed, and the address discharge can be stably executed.

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)

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 formed on the lower substrate so as to face the upper dielectric layer; Partition walls partitioning discharge cells between the upper substrate and the lower substrate; A phosphor layer disposed for each discharge cell; A pair of common electrodes and scan electrodes embedded in the upper dielectric layer, each having a base extending in one direction and extending portions protruding from the base into the discharge cells, respectively; Extension electrodes of the scan electrodes are disposed on both sides of the discharge cells at the centers thereof, respectively, and sustain electrode pairs are disposed to form discharge gaps between side surfaces of the extension parts; Embedded in the lower dielectric layer and extending in a direction crossing the sustain electrode pairs, a main body portion disposed along a center of the discharge cell, and an end portion protruding from the side surface of the main body portion toward the scan electrode; And an address electrode having protrusions of the plasma display panel. The method of claim 1, And the protrusions are disposed to overlap the extension of the scan electrode. delete The method of claim 1, And each of the protrusions has a triangular shape. The method of claim 1, And the projections are arranged on the same plane as the main body. The method of claim 1, A discharge gap is formed between the protruding end of the extension of the common electrode and the base of the scan electrode, and the protruding end of the extension of the scan electrode and the base of the common electrode arranged for each discharge cell. Plasma display panel. The method of claim 1, The base and the extension of the common electrode and the scan electrode are formed of indium tin oxide (ITO), respectively, and a common bus electrode is connected to the base of the common electrode, and a scan bus electrode is connected to the base of the scan electrode. Plasma display panel. The method of claim 1, And the barrier ribs are formed to be spaced apart from each other with the address electrodes interposed therebetween, the barrier ribs having vertical barrier ribs partitioning into stripe-shaped discharge cells. The method of claim 8, Plasma display panel, characterized in that the horizontal partitions are formed on each side of the vertical partition wall so as to be spaced apart in the direction crossing the vertical partition wall, and divided into discharge cells of the matrix form. The method of claim 1, And a protective layer is formed on the lower surface of the upper dielectric layer.

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