KR20070097201A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve luminance and to reduce power consumption by using a plurality of fine lines for connecting a plurality of main parts with each other. A first and second substrates(111,121) are opposite to each other. A barrier rib(130) is formed in a space between the first and second substrates in order to form discharge cells(170). A plurality of address electrodes(122) are extended across the second substrate. A plurality of pairs of sustain electrodes(112) are extended across the first substrate and include pairs of first and second sustain electrodes across the address electrodes in a part corresponding to the discharge cells. A light emitting layer is disposed in each of the discharge cells. The discharge cells are filled with discharge gas. The first and second sustain electrodes are extended across the first substrate. The first and second sustain electrodes include a plurality of main parts(181,182,183,191,192,193) which cross the address electrodes. The first and second sustain electrodes further include a connective part which is formed to connect the main parts with each other. A concave part(184,194) is formed partially at the main parts adjacent to a center part of the discharge cells.

Description

Plasma display panel {Plasma display panel}

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

2 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention.

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

4 is a plan view illustrating the shapes of the discharge cells and the sustain electrodes illustrated in FIG. 2.

5 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention.

6 is a plan view illustrating the shapes of the discharge cells and the sustain electrodes illustrated in FIG. 5.

<Brief description of symbols for the main parts of the drawings>

100: plasma display panel 111: first substrate

115: first dielectric layer 116: protective film

121: second substrate 122: address electrode

125: second dielectric layer 130: partition wall

140: light absorption layer 170: discharge cell

180: X electrode 190: Y electrode

181,191: first main body 182,192: second main body

183, 193: third body part 184 (185), 194 (195): connection part

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having high luminance and low power consumption.

Plasma display panel, which is recently attracting attention as a replacement for a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. It is an apparatus which obtains a desired image by exciting a light-emitting body formed in a predetermined pattern with ultraviolet light to emit visible light.

1 illustrates a conventional AC plasma display panel 10.

The conventional AC plasma display panel 10 illustrated in FIG. 1 includes a front panel 50 showing an image to a user and a rear panel 60 coupled in parallel thereto.

On the front substrate 11 of the front panel 50, a sustain electrode pair 12 in which the X electrode 31 and the Y electrode 32 are paired is disposed. On the rear substrate 21 of the rear panel 60 opposite to the surface on which the sustain electrode pair 12 of the front substrate 11 is disposed, an address electrode 22 is formed on the positive electrodes 31 and 32 of the front substrate 11. ) To intersect. Each of the first dielectric layer 15 and the second substrate is embedded in each of the front substrate 11 having the sustain electrode pairs 12 and the rear substrate 21 provided with the address electrodes 22. Dielectric layer 25 is formed. A protective layer 16, usually made of MgO, is formed on the back of the first dielectric layer 15. The front surface of the second dielectric layer 25 maintains a discharge distance and provides electro-optic crosstalk between discharge cells. The partition 30 which prevents is formed. Red, green, and blue light emitting phosphors 26 are coated on both sides of the partition wall 30 and on the entire surface of the second dielectric layer 25 on which the partition wall 30 is not formed.

Each of the X electrode 31 and the Y electrode 32 includes transparent electrodes 31a and 32a and bus electrodes 31b and 32b. The space formed by the pair of X electrodes 31 and Y electrodes 32 arranged in this way and the address electrodes 22 intersecting the same forms one discharge unit as the unit discharge cells 70. The transparent electrodes 31a and 32a are formed of a transparent material which is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor layer 26 from going out to the front substrate 11. indium tin oxide). However, transparent conductors such as ITO generally have high resistance, and thus, when the discharge sustaining electrode is formed only by the transparent electrode, a large voltage drop in the longitudinal direction consumes a lot of driving power and a slow response time. To this end, bus electrodes 31b and 32b made of a metal material and having a narrow line width are disposed on the transparent electrode.

However, in the sustain electrode provided with the bus electrode and the transparent electrode, since the cost of the transparent electrode is high, and processes for forming the bus electrode and the transparent electrode are required, cost and manufacturing time have been increased.

In order to solve this problem, techniques for forming a sustain electrode using only the bus electrode have been developed. However, only a bus electrode having a general shape has a problem of low luminance.

An object of the present invention is to provide a plasma display panel with high brightness.

Another object of the present invention is to provide a plasma display panel with low power consumption.

According to the present invention, a partition wall partitioning a space between the first and second substrates facing each other, the first substrate, and the second substrate into a plurality of discharge cells, and a plurality extending long across the second substrate, are provided. The first holding electrode and the second holding electrode, which are separated from each other and face each other, extend long across the first substrate, and cross the address electrodes at portions corresponding to the discharge cells. A pair of sustain electrodes paired with each other, a light emitting layer disposed in the discharge cells, and a discharge gas disposed in the discharge cells, wherein each of the first and second sustain electrodes crosses the first substrate. A plurality of body parts extending from each other and separated from each other, intersecting the address electrodes, and connecting portions connecting the main body parts to each other, the bone adjacent to a central portion of the discharge cell; A concave portion is formed in at least a portion of the body portions.

In the present invention, the main body portion may be composed of three.

In the present invention, the connection portion and the main body portion may have a structure that perpendicularly cross each other.

In the present invention, one connection part may be arranged for each discharge cell.

According to another aspect of the present invention, a first substrate and a second substrate facing each other, a partition wall partitioning the space between the first substrate and the second substrate into a plurality of discharge cells, and across the second substrate The first sustaining electrode and the second sustaining electrode are elongated and are separated from each other, facing each other, extending long across the first substrate, and intersecting the address electrodes at a portion corresponding to the discharge cells. A plurality of pairs of sustain electrodes having a pair of electrodes, a light emitting layer disposed in the discharge cells, and a discharge gas disposed in the discharge cells, each of the first and second sustain electrodes being the first electrode; A plurality of body parts extending and separated across the substrate and intersecting the address electrodes, and connecting parts connecting the body parts, each connecting parts being formed in a plurality of lines. The present invention provides a plasma display panel, wherein a space is formed between the plurality of lines.

In the present invention, the main body parts may be manufactured such that a recess is formed in at least a part of the main body parts adjacent to the central part of the discharge cell.

In the present invention, the connecting portion may be formed of two lines.

In the present invention, the connection portion and the main body portion may have a structure that perpendicularly cross each other.

In the present invention, one connection part may be arranged for each discharge cell.

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

FIG. 2 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. 4 is a plan view illustrating the shapes of the discharge cells and the sustain electrodes illustrated in FIG. 2, and FIG. 5 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention. 6 is a plan view illustrating the shapes of the discharge cells and the sustain electrodes illustrated in FIG. 5.

2 to 6, the plasma display panel 100 according to the exemplary embodiment of the present invention may include a first substrate 111, a second substrate 121, sustain electrode pairs 112, and an address electrode 122. ), A partition wall 130, a protective layer 116, phosphor layers 126, a first dielectric layer 115, a second dielectric layer 125, and a discharge gas (not shown).

The first substrate 111 may be generally made of a material having excellent light transmittance mainly containing glass. However, the first substrate 111 may be colored in order to improve the bright room contrast by reducing the reflection luminance. In addition, the second substrate 121 may be spaced apart from the first substrate 111 at a predetermined interval to face each other, and may be made of a material having excellent light transmittance such as glass. The second substrate 121 may be colored similarly to the first substrate 111. In the present invention, visible light generated by the discharge cells 170 may be emitted to the outside through the first substrate 111 or the second substrate 121. However, in the present embodiment, visible light generated in the discharge cell may be emitted to the outside through the first substrate 111.

A partition wall 130 is disposed between the first substrate 111 and the second substrate 121 to divide the space therebetween into a plurality of discharge cells 170 in which discharge occurs. The partition 130 performs a function of preventing optical crosstalk between the discharge cells 170. In the present exemplary embodiment, the partition wall 130 intersects the first partition wall portions 130a and the first partition wall portions 130a that are arranged in a direction (y direction) in which the address electrodes 122, which will be described later, extend. Direction) and the second partition walls 130b, the discharge cells 170 are formed to have a rectangular cross section. However, the shape of the partition wall is not limited thereto, and as long as it is possible to form a plurality of discharge spaces, the partition wall of various patterns, for example, an open partition wall such as a stripe, may be a closed partition wall such as a waffle, a matrix, a delta, and the like. Can be. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon, such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the rectangle as in the present embodiment.

On the first substrate 111 facing the second substrate 121, the sustain electrode pairs 112 are arranged in parallel at predetermined intervals. Each sustain electrode pair 112 includes an X electrode 180 and a Y electrode 190, and the X electrode 180 and the Y electrode 190 cause plasma discharge in the discharge cell 170.

Each X electrode 180 includes a first main body 181, a second main body 182, a third main body 183, and a connection 184. In this case, the first electrode part 181, the second electrode part 182, and the third electrode part 183 are disposed in the order from the center of the discharge cell 170. The first main body 181, the second main body 182, and the third main body 183 are spaced apart at predetermined intervals, and the third main body 183 is concave with the discharge cell as the center. To form. In this embodiment, each X electrode 180 has three main body portions 181, 182, and 183, but the present invention is not limited thereto.

The connecting portions 184 are arranged to make an electrical connection between the first body portion 181, the second body portion 182, and the third body portion 183. In the present exemplary embodiment, one connection part 184 of each X electrode is disposed in each discharge cell 170 so as to correspond to the center portion of the discharge cell 170, and the first, second and third body parts 181, and the like. 182 and 183, and are disposed substantially in a vertical direction (y direction). However, the present invention is not limited to the above-described arrangement structure. According to another embodiment of the present invention, the connection portions 184 and 185 of each X electrode are formed of a plurality of lines, and have a structure in which a space is formed between the plurality of lines.

The first, second, and third body parts 181, 182, and 183 and the connection parts 184 of the X electrode may be formed using various conductive materials, and preferably include a metal material or a ceramic material. It is formed of a material. Examples of the metal material include Ag, Pt, Pd, Ni, and Cu, and ceramic materials include indium doped tine oxide (ITO) and antimony doped tine oxide (ATO). In addition, in order to increase emission of secondary electrons, the first, second, and third electrode portions 181, 182, and 183 and the connection portions 184 of the X electrode may be formed using a material including carbon nanotubes. It may be.

The first, second, and third body parts 181, 182, and 183 and the connection parts 184 of the X electrode may have a single layer structure, but preferably have a multilayer structure. If the first, second, and third electrode portions 181, 182, and 183 and the connecting portions 184 of the X electrode have a multilayer structure, each layer may be formed using a different material.

Each of the Y electrodes 190 also includes a first body portion 191, a second body portion 192, a third body portion 193, and a connection portion 194. The Y electrode 190 has a shape symmetrical to the X electrode 180 in each discharge cell 170, it is preferable for the uniformity of the discharge. For the structure, function and material of the first, second and third body parts 191, 192, 193 and the connection parts 194 of the Y electrode, the first, second and third electrode parts of the X electrode ( 181, 182, 183, and connections 184, so they are omitted here.

Light absorption layers 140 are disposed between adjacent pairs of sustain electrodes 112. In more detail, the light absorption layers 140 are disposed on the first substrate 111 corresponding to the second partition walls 130b. The light absorbing layers 140 absorb visible light incident from the outside and reduce the reflected brightness, thereby increasing contrast. In the present embodiment, the light absorption layers 140 have a stripe shape. In addition, when the light absorption layers 140 are formed using the same material as the X electrodes 180 and the Y electrodes 190, the light absorption layers 140 are formed simultaneously in the process of forming the X electrodes 180 and the Y electrodes 190. Since it is possible, the process has the advantage of being simplified.

The first dielectric layer 115 is formed on the front substrate 111 to fill the X electrodes 180 and the Y electrodes 190. The first dielectric layer 115 is directly connected between the adjacent X electrode 180 and the Y electrode 190 during discharge, and positive or negative electrons directly collide with the X electrodes 180 and the Y electrodes 190 to discharge the X electrodes. While preventing damage to the 180 and the Y electrode 190, a dielectric material capable of inducing charge and accumulating wall charges is formed. Such dielectrics include PbO, B2O3, and SiO2.

On the first dielectric layer 115, a protective layer 116, which is usually made of MgO, is formed. The protective layer 116 prevents cations and electrons from colliding with the first dielectric layer 115 when the discharge damages the first dielectric layer 115, and has good light transmittance and emits a lot of secondary electrons during discharge. . In particular, the protective layer 116 is mainly formed of a thin film using sputtering, electron beam deposition, or the like.

On the second substrate 121 opposite to the first substrate 111, the address electrodes 122 are disposed to intersect the X electrodes 180 and the Y electrodes 190. The address electrodes 122 are intended to cause an address discharge to facilitate sustain discharge between the X electrodes 180 and the Y electrodes 190. More specifically, the address electrodes 122 serve to lower a voltage for generating a discharge. The address discharge is a discharge occurring between the Y electrodes 190 and the address electrodes 122. When the address discharge is completed, cations are accumulated on the Y electrodes 190 and electrons are accumulated on the X electrode 180 side. As a result, the sustain discharge between the X electrodes 180 and the Y electrodes 190 becomes easier.

The second dielectric layer 125 is formed on the rear substrate 121 to fill the address electrodes 122. The second dielectric layer 125 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrodes 122 when they are discharged and damaging the address electrodes 122. Such dielectrics include PbO, B2O3, SiO2, etc.

Red, green, and blue light emitting phosphor layers 126 are formed on the second dielectric layer 125 between the partition walls 130 partitioning the discharge cells 170 and on the side surfaces of the partition walls 130. The phosphor layers 126 have a component that generates ultraviolet light by receiving ultraviolet rays. The red phosphor layers formed in the red discharge cells include phosphors such as Y (V, P) O 4: Eu, and green discharge cells. The red light emitting phosphor layers formed on the light emitting diodes include phosphors such as Zn 2 SiO 4: Mn, and the like, and the blue light emitting phosphor layers formed on the blue discharge cells include phosphors such as BAM: Eu and the like.

In addition, the discharge cells 180 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 first and second substrates 111 and 121. The first substrate and the second substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edge of the substrate.

Referring to the operation of the plasma display panel 100 according to the present invention configured as described above are as follows.

The address discharge is generated by applying an address voltage between the address electrodes 122 and the Y electrodes 190, and the discharge cells 170 in which the sustain discharge is generated as a result of the address discharge are selected. Thereafter, when a sustain voltage is applied between the X electrodes 180 and the Y electrodes 190 of the selected discharge cells 170, the cations and the X electrodes 180 accumulated on the Y electrodes 190 side. The electrons accumulated on the side collide with each other to generate sustain discharge. After that, voltage pulses applied to the X electrodes 180 and the Y electrodes 190 are alternated, and the discharge continues. In the sustain discharge between the X electrodes 180 and the Y electrodes 190, the third body portions 183 of the X electrodes having the narrowest discharge gap and the third body portions 193 of the Y electrodes. The discharge is started between them, and then the discharge is continuously spread to the second body portions 182 and 192 and the first body portions 181 and 191.

In this manner, ultraviolet rays are emitted while the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor 126 applied in the discharge cells 170. As the energy level of the excited phosphor 126 is lowered, visible light is emitted, and the emitted visible light constitutes an image.

However, the X electrode 180 and the Y electrode 190 perform a function of causing a sustain discharge, but prevent the visible light generated in the discharge cells 170 from passing through the first substrate 111 to the outside. Has its drawbacks.

 Therefore, in the present invention, the third body portion of each sustain electrode pair is concave at the center portion of the discharge cell so that each of the body portions maintains a close distance toward the edge, so that when the discharge voltage is supplied, the discharge body is formed close to the low discharge voltage. Discharge may occur first at both edge regions of the discharge cell, and thus discharge may spread to all of the sustain electrode pairs 180 and 190, and the third body parts 183 and 193 may be concave at the center of the discharge cell. Therefore, since the path of the visible light generated by the discharge is not blocked, high luminance can be expressed.

In addition, in the present invention, the connecting portions 184 and 194 of the X and Y electrodes are discharged smoothly, and the third body portions 183 and 193 and the second body portion 182 ( Discharge occurs in the space between the 192 and the second body portion 182 (192) and the first body portion 181, 191, but not only the electrode area facing each other is small, Since the discharge is disposed along the center portion of the discharge cells that generate a lot of discharges, it has a disadvantage of largely shielding the visible light generated in the discharge cells 170. Therefore, since the connection portion has a smaller contribution to the discharge compared to the main body portion, the light emitted from the phosphor is blocked, and as a result, the efficiency is greatly reduced due to the decrease in the luminance and the discharge efficiency due to the decrease in the aperture ratio compared to the discharge. . Therefore, by forming the empty space in the center portion by treating the connection portion with a plurality of thin lines instead of one thick connection portion in the center connection portion, it is possible to obtain the aperture ratio improvement and the luminance improvement effect.

Although the present invention has been described with reference to the above-described embodiments, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

The plasma display panel of the present invention has the following effects.

First, since the third body portion of the electrode adjacent to the center portion of the discharge cell among the sustain electrode pairs has a concave shape, the luminance is improved and the power consumption is reduced.

Second, since the space is formed by forming a plurality of thin lines connected to the respective main body portions of the sustain electrode, the luminance is improved and the power consumption is reduced.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (11)

A first substrate and a second substrate facing each other; A partition wall partitioning a space between the first substrate and the second substrate into a plurality of discharge cells; A plurality of address electrodes extending longitudinally across the second substrate; A plurality of pairs of first and second sustain electrodes which are separated from each other and extend long across the first substrate and cross the address electrodes at portions corresponding to the discharge cells; Sustain electrodes; A light emitting layer disposed in the discharge cells; And A discharge gas disposed in the discharge cells; Each of the first and second holding electrodes extends long across the first substrate and is separated from each other, and includes a plurality of main body portions intersecting the address electrodes, and a connecting portion connecting the main body portions to each other. And a recessed portion formed in at least a portion of the main body portions adjacent to the center portion of the discharge cell. The method of claim 1, And three body parts. The method of claim 1, And the connection parts and the body parts perpendicularly cross each other. The method of claim 1, And one or more connection parts arranged on each of the discharge cells. A first substrate and a second substrate facing each other; A partition wall partitioning a space between the first substrate and the second substrate into a plurality of discharge cells; Address electrodes extending across the second substrate; A plurality of pairs of first and second sustain electrodes which are separated from each other and extend long across the first substrate and cross the address electrodes at portions corresponding to the discharge cells; Sustain electrodes; A light emitting layer disposed in the discharge cells; And A discharge gas disposed in the discharge cells; Each of the first and second sustain electrodes extends and is separated from the first substrate, and includes a plurality of main body portions intersecting the address electrodes, and a connection portion connecting the main body portions. The connections of the plasma display panel having at least one hole. The method of claim 5, And the main body portions have recesses in at least a portion adjacent to a central portion of the discharge cell. The method of claim 6, The holes of the connection parts are formed along the direction connecting the main body parts.       The method of claim 5,       The holes of the connection parts are formed along the direction connecting the main body parts. The method of claim 5, And three body parts. The method of claim 5, And the connection parts and the body parts perpendicularly cross each other. The method of claim 5, And one or more connecting parts are disposed in each of the discharge cells.

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