KR20060112305A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to increase a transmittance ratio from less than 60% to more than 90% by increasing an aperture ratio of a front panel by removing components other than the front panel from a front portion of the plasma display panel. A plasma display panel includes front and rear substrates(120,130), a first barrier rib(127), first electrodes(122), second electrodes(123), a fluorescent layer(139), and discharge gas. The front and rear substrates face each other. The first barrier rib is arranged between the front and rear substrates and defines discharge cells with the front and rear substrates. The first electrodes are arranged inside the first barrier rib to enclose a first corner portion of discharge cells. The second electrodes are arranged in the first barrier rib to enclose a second corner portion of the discharge cells, which faces the first corner portion. The second electrodes are apart from the first electrodes by a predetermined gap. The fluorescent layer is arranged inside the discharge cells. The discharge gas is contained in the discharge cells. Each of the first and second electrodes includes a front end, a rear end, and a central portion, which is located inside the first barrier rib, rather than on the front and rear ends.

Description

Plasma display panel {Plasma display panel}

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

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

3 is a cross-sectional view showing one lateral cross section of FIG. 2.

4 is a cross-sectional view taken along line IV-IV of FIG. 2.

5 is a perspective view illustrating a first electrode, a second electrode, and an address electrode of FIG. 2.

FIG. 6 is a cross-sectional view taken along the line IV-IV of FIG. 2 to explain the address discharge of the embodiment of the present invention.

7 is a plan view for explaining the sustain discharge of the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 120: front substrate

122: first electrode 123: second electrode

122a: first base 122b: first protrusion

122_a: First electrode front end 122_b: First electrode rear end

122_c: center of first electrode 123a: second base

123b: second protrusion 123_a: front end of second electrode

123_b: Rear end of second electrode 123_c: Center of second electrode

127: first partition 129: shield

130: rear substrate 133: address electrode

136: dielectric layer 137: second partition wall

139: phosphor layer C: discharge cell

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel that expresses a character or an image by using gas discharge. More particularly, the present invention relates to a plasma display panel capable of low voltage driving, an enlarged surface of a discharge, and an improved aperture ratio. It is about.

Recently, a device employing a plasma display panel as a flat panel display device has a large screen, and has excellent characteristics of high definition, ultra-thin, light weight, and wide viewing angle. It is attracting attention as a large flat panel display device.

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 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. In recent years, an AC plasma display panel having an AC type, in particular, a three-electrode surface discharge structure is present. This has been generally employed.

The conventional surface discharge plasma display panel 10 including the AC three-electrode surface discharge plasma display panel includes a front substrate 20 and a rear substrate 30 as shown in FIG. 1.

The rear substrate 30 includes an address electrode 33 for generating an address discharge, a rear dielectric layer 35 embedding the address electrode, a partition wall 37 partitioning discharge cells, and both sides of the partition wall and the partition wall. The phosphor layer 39 applied to the back substrate which is not formed is formed.

The front substrate disposed to face the rear substrate so as to be spaced apart from each other, the front and rear dielectric layers 25 having the X and Y electrodes 22 and 23 generating a sustain discharge, and the X and Y electrodes 22 and 23 embedded therein; The protective film 29 is provided.

However, in the conventional plasma display panel, first, the transparent X electrode 22a and one side of the transparent X electrode are disposed on the front substrate 20 through which visible light emitted from the phosphor layer 39 in the discharge space passes. Y electrode 23 normally provided with an X electrode 22 having a bus X electrode 22b, and a bus Y electrode 23b disposed on one side of the transparent Y electrode 23a and the transparent Y electrode 23a. ), A front dielectric layer 27, and a protective film 29 formed sequentially on the X and Y electrodes. These factors have a serious problem that the visible light transmittance of about 60%.

Second, in the conventional surface discharge plasma display panel 10, the electrode which causes the discharge is formed on the upper surface of the discharge space, that is, the inner surface of the front substrate 20 through which visible light passes, so that the discharge occurs on the inner surface and diffuses. Therefore, there is an inherent problem of low luminous efficiency.

Third, the conventional surface discharge plasma display panel 10 has a problem that, when used for a long time, the charged particles of the discharge gas causes ion sputtering on the phosphor by an electric field, causing permanent afterimage.

SUMMARY OF THE INVENTION The present invention is to solve the above problems, to provide a plasma display panel that can significantly expand the opening area and transmittance as compared to the conventional plasma display panel, and can significantly expand the discharge area by greatly expanding the discharge surface. .

Another object of the present invention is to provide a plasma display panel having a structure which prevents the phosphor from being damaged by the address discharge and the sustain discharge.

Another object of the present invention is to concentrate the plasma by the discharge to a predetermined portion of the discharge space, for example, the center portion, to efficiently use the space charge of the plasma, it is possible to drive low voltage, and to significantly improve the luminous efficiency It is to provide a plasma display panel.

In order to achieve the above object, a plasma display panel according to an embodiment of the present invention is:

A front substrate and a rear substrate facing each other and disposed in front and rear, respectively;

A first partition wall disposed between the front substrate and the rear substrate to form a plurality of corners to partition discharge cells together with the front substrate and the rear substrate, and a dielectric;

First electrodes arranged in a first partition wall to surround a first corner part for each of the discharge cells;

Second electrodes disposed in parallel with the first electrodes in the first partition wall to surround the second corner portions facing the first corner portions for each of the discharge cells, and having a gap with the first electrodes. ;

A phosphor layer disposed in the discharge cell; And

And a discharge gas in the discharge cell,

Each of the first and second electrodes includes: a front end and a rear end; And a central portion located inside the first partition wall covering the front and rear ends thereof, and is concavely disposed from the side surface of the first partition wall into the first partition wall.

In this case, the second electrode has an inclination of 5 degrees to 40 degrees from an imaginary line perpendicular to the lower surface of the first partition to an inner portion of the first electrode at the front and rear ends of the first electrode. It is preferable to have an inclination of 5 degrees to 40 degrees from the imaginary line perpendicular to the lower surface of the first partition to the inner side from the rear end to the center of the first partition.

The first electrode may include a first base portion disposed to extend in one direction for each of the discharge cells, and first protrusions protruding from the first base portion at the first corner portion for each discharge cell. The second electrode may include: a second base part spaced apart in a direction parallel to the first base part for each of the discharge cells, and a second projecting part protruding from the second base part at a second corner part facing the first corner part for each discharge cell; It is preferable to have two protrusions.

Here, the first base portion and the second base portion may further include an address electrode disposed to extend in a direction crossing the direction in which the extension, the address electrode is disposed between the back substrate and the phosphor layer, the phosphor It is preferable that a dielectric layer filling the address electrode is disposed between the layer and the address electrode.

Meanwhile, a second partition wall is formed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall, and the phosphor layer has no side surface and the second partition wall formed thereon. It is preferable that it is formed on the upper surface of the dielectric layer.

Next, a plasma display panel according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

2 to 4, the plasma display panel 100 according to an exemplary embodiment of the present invention may include a front substrate 120, a rear substrate 130, a first partition 127, a first electrode 122, and a first substrate 122. The second electrode 123, the phosphor layer 139, and a discharge gas are provided.

The transparent front substrate 120 is disposed in parallel with the rear substrate at the front (+ z direction) of the rear substrate 130 so that visible light passes and the image is projected. A first partition 127 is formed between the front substrate 120 and the rear substrate 130. The first partition wall 127 is disposed in the non-discharge unit to partition the discharge cell (C). The first partition wall 127 has a first corner portion 127a forming a corner of the discharge cell C, a second corner portion 127b facing the first corner portion 127a in a diagonal direction, and a discharge, respectively. Corner parts 127c and 127d are provided.

The discharge cell C is disposed in a sub-pixel in which a red discharge cell is disposed in a subpixel on which a red phosphor layer 139R emitting red visible light is formed, and a green phosphor layer 139G in which green visible light is emitted. One of the green discharge cells and the blue discharge cells disposed in the sub-pixels on which the blue phosphor layer 139B emitting blue visible light is formed. The discharge cell C is a space for generating a discharge and generating light to implement an image.

In the first partition 127, the first electrode 122 and the second electrode 123 extend in one direction for each discharge cell. The first electrode 122 is disposed in the first partition wall 127 so as to surround the first corner portion 127a for each of the discharge cells C. In addition, the second electrode 123 is arranged to have a predetermined gap with the first electrodes so as to surround the second corner portion 127b facing the first corner portion 127a for each of the discharge cells C. Is placed.

In this case, the first electrode 122 may include a first base portion 122a and a first protrusion 122b. The first base portion 122a is disposed to extend in one direction for each of the discharge cells, for example, in the x-axis direction in the drawing, and the first protrusion 122b is formed at each of the discharge cells in the first corner portion 127a. It protrudes from the 1st base part 122a in-y-axis direction, for example in drawing.

The second electrode 123 includes a second base 123a and a second protrusion 123b. The second base part 123a is disposed in the first partition wall, and is spaced apart in the direction parallel to the first base part 122a in one discharge cell, for example, in the x-axis direction in the drawing, and the second protrusion part 123b is provided. ) Projects from the second base portion 123a at the first corner portion 127b facing the first corner portion 127a, for example, in the y-axis direction.

That is, the first electrode 122 is disposed in the first partition 127 so as to surround the first corner portion 127a of one discharge cell C, and the second electrode 123 is the first electrode. The wrap is disposed in the partition wall 127 so as to surround the first corner portion 127a of the discharge cell C and the second corner portion 127b facing in a diagonal direction.

The first electrode 122 and the second electrode 123 are not disposed in the center of the discharge cell (C). Therefore, the cross-sectional area of the AC plasma display panel 10 having the three-electrode surface discharge structure can be larger than that of the X electrode and the Y electrode.

In particular, as shown in FIG. 4, the central portion 122_c of the first electrode 122 has a first partition wall covering the first electrode 122 than the front end 122_a and the rear end 122_b. 127) located inside. In addition, the center portion 123_c of the second electrode 123 is also located inside the first partition 127 covering the second electrode than the front end portion 123_a and the rear end portion 123_b. That is, the first and second electrodes 122 and 123 are concavely disposed in the first partition wall from the side surface of the first partition wall 127a. As a result, the phosphor layer 139 is prevented from being damaged, and the luminance is raised to improve the efficiency.

That is, in the present invention, the first electrode 122 and the second electrode 123 corresponding to one discharge cell are disposed to face each other in the adjacent first partition wall 127 so as to face each other. In this case, if the first electrode and the second electrode facing each other on the upper side of the phosphor layer 139 are arranged in a straight line in the front and rear side parallel to the side surface of the first partition wall, the first electrode and the second electrode move during the sustain discharge. Due to the discharge flux of the ions, a part thereof approaches the phosphor layer and collides with the phosphor layer. This causes damage to the phosphor layer, which in turn adversely affects the life of the phosphor layer.

Accordingly, in the present invention, the center portions 122_c and 123_c of the first electrode 122 and the second electrode 123 are located inside the first partition wall than the front and rear ends 122_a and 122_b and 123_a and 123_b. . That is, the first partition wall is the first partition wall from the front and rear end portions 122_a and 122_b to the center portion 122_c and the virtual line L perpendicular to the bottom surface 127r of the first partition wall. 127 is formed to have a predetermined inclination α1, α2 toward the inner side, and the second electrode 123 from the front and rear end portions 123_a and 123_b to the center portion 122_c, and the lower surface of the first partition wall It is formed to have a predetermined slope (β1, β2) toward the inside of the first partition wall with respect to the virtual line (L) perpendicular to (127r).

The rear end portions 122_b and 123_b of the first electrode 122 and the second electrode 123 are formed to be inclined α2 and β2 in a direction away from the phosphor layer 139 to thereby form a rear side of the first electrode. During discharge between the end 122_b and the rear end 123_b of the second electrode, the discharge flux is generated in a direction away from the phosphor layer, that is, toward the center of the discharge cell C. FIG.

As a result, the extent to which the ions moving between the first electrode 122 and the second electrode 123 do not collide or collide with the phosphor layer 139 during the sustain discharge is minimized, thereby increasing the life of the phosphor layer 139. As a result, even if a long time passes, the degree of excitation of the visible light of the phosphor layer 139 does not significantly decrease.

 In addition, the virtual line L perpendicular to the lower surface 127r of the first partition wall is also referenced to the central portions 122_c and 123_c from the front ends 122_a and 123_a of the first and second electrodes 122 and 123. As a result, the inclined surfaces α1 and β1 may be inclined toward the inside of the first partition wall 127. Accordingly, the first and second electrodes 122 and 123 are concavely disposed in the first partition wall from the side surface of the first partition wall 127a. As a result, the distance between the front and rear end portions 122_a and 122_b of the first electrode corresponding to one discharge cell C and the front and rear end portions 123_a and 123_b of the second electrode is close, so that even at a low voltage As the firing occurs, the discharge start voltage is decreased, and the distance between the center portion 122_c of the first electrode and the center portion 123_c of the second electrode corresponding to one discharge cell C is increased, thereby discharging the discharge path. It becomes longer and the amount of discharge increases, thereby increasing the luminance.

As a result, the voltage of the discharge is relaxed by reducing the discharge start voltage, and the luminance is increased without increasing the voltage, and as a result, the efficiency of the panel is increased.

  In this case, each of the front and rear end portions 122_a and 122_b of the first electrode 122 is moved from the virtual line L perpendicular to the lower surface of the first partition wall 127r to the inside of the first partition wall. It has an inclination α1, α2 of 5 to 40 degrees, and is also perpendicular to the first bottom surface 127r from the front and rear end portions 123_a and 123_b to the center portion 123c of the second electrode. It is preferable to have inclinations β1 and β2 of 5 to 40 degrees in the direction of the first partition wall from the line L. When the inclination α1 (α2) (β1) (β2) is 5 degrees or less from the imaginary line L, the discharge flux is not significantly different as compared with the case where the first electrode and the second electrode are straight. When the inclination is 40 degrees, the ions do not collide with the phosphor layer, and at higher inclinations, the effect is not superior to the inclination of 40 degrees or less, and the length of the center portion is excessively long. This is because an adverse effect of decreasing efficiency is generated.

On the other hand, it is preferable to have a predetermined clearance K between the first electrode 122 and the second electrode 123 disposed in the one first partition 127. The predetermined clearance K is such that induced electromotive force is generated between the first electrode 122 and the second electrode 123 during the sustain discharge, so that no false discharge occurs in the neighboring discharge cells. It means that the clearance between the 122 and the second electrode 123 can prevent the mutual short circuit.

Meanwhile, the front substrate 120 and the rear substrate 130 are generally formed of glass, and the front substrate 120 is preferably formed of a material having high light transmittance.

The first partition wall 127 disposed between the front substrate 120 and the rear substrate 130 is formed to define the discharge cells C together with the front substrate 120 and the rear substrate 130.

First and second electrodes 122 and 123 are disposed in the first partition 127, and discharge occurs because a potential is applied to the discharge electrode, so that the first partition 127 is applied to the discharge electrode. The electric field formed by the applied potential must be formed of a dielectric so that it can be transferred into the discharge cell by the molecular arrangement of the front partition material.

In this case, the first partition wall 127 may be formed of a glass component including elements such as Pb, B, Si, Al, and O, and, if necessary, ZrO ₂ , TiO ₂ , and Al. It may be formed of a dielectric including fillers such as ₂ O ₃ and pigments such as Cr, Cu, Co, Fe, TiO _2, and the like. Such a dielectric induces charged particles by a potential applied to the discharge electrode, induces wall charges participating in the discharge, and protects the discharge electrodes.

After forming the first partition 127, it is preferable to form the passivation layer 129 on the side surface of the first partition by deposition or the like. The protective layer protects the first electrode and the second electrode 123 and the first partition 127 covering the discharge electrode, and emits secondary electrons during discharge to facilitate discharge. In the process of forming the passivation layer 129, a passivation layer may be formed on the rear surface 120r of the front substrate and the rear surface 127r of the first partition wall. However, the protective film formed on the rear surface 120r of the front substrate and the rear surface 127r of the first partition wall does not significantly affect the present invention.

The second partition 137 may be formed between the dielectric layer 136 and the first partition 127. In this case, the second partition 137 may also be formed of a glass component including elements such as Pb, B, Si, Al, and O, such as the first partition, and, if necessary, ZrO ₂ Fillers such as, TiO ₂ , and Al ₂ O ₃ and pigments such as Cr, Cu, Co, Fe, TiO _2, and the like may be included. In this case, it is preferable that the second partition 137 has a bright color, which is because the second partition 137 reflects visible light directed to the second partition 137 so that the visible light excited by the phosphor layer 139 becomes the second partition ( This is because it can be prevented from flowing into another discharge cell adjacent to each other through 137.

The second partition 137 is secured to the space to which the phosphor layer 139 can be applied, and is filled in the front substrate 120 and the rear substrate 130 together with the first partition 127. It supports the pressure generated due to the vacuum state of the discharge gas (for example, 0.5 atm), secures the space of the discharge cell (C), and serves to prevent cross talk between the discharge cells. Can be. In addition, the second partition wall may include a reflective material so that visible light generated from the discharge cell may be reflected forward. The second partition wall 137 prevents an erroneous discharge between the discharge cells (C).

In FIG. 2, the second partition wall 137 partitions the discharge cells in a matrix form, but is not limited thereto. The second partition wall 137 may also partition the discharge cells in another form such as a honeycomb form. In addition, although the cross section of the discharge cell C defined by the second partition 137 is illustrated in FIG. Can be formed.

Address electrodes 133 may be disposed on the front surface 130f of the back substrate 130. The address electrode 133 extends in the y-axis direction across the discharge cells C in the drawing and extends to intersect the first and second electrodes 122 and 123, wherein the address electrodes are formed of the dielectric layer 136. Can be covered by).

In this case, as shown in FIG. 5, the address electrode 133 is formed to cross the direction in which the first and second base parts 122a and 123a extend. The extension of the first and second base portions 122a and 123a to intersect the address electrode 133 means that the columns of the discharge cells C through which the address electrode 133 passes, and the first and second electrodes 122, This means that the columns of the discharge cells C passing through 123 cross each other. In addition, the first electrode 122 extended in parallel with the second electrode 123 means that the first base portion 122a is disposed together at a predetermined interval from the second base portion 123a.

In the present exemplary embodiment, the first electrode 122, the second electrode 123, and the address electrode 133 are disposed to surround the upper side of the discharge cell C. The upper side of the discharge cell means a portion higher than the second partition wall 137.

As the discharge gas charged in the discharge cell, a penning mixture such as Xe-Ne, Xe-He, Xe-Ne-He, etc. is used. The reason why Xe is used as the main discharge gas is that because Xe is a chemically stable inert gas, it is not dissociated due to discharge, but because the atomic number is large, the excitation voltage is lowered and the wavelength of light emitted is increased. to be. The reason for using He or Ne as a buffer gas is that the voltage reduction effect due to the panning effect due to Xe and the sputtering effect due to the high pressure are reduced. The main discharge gas may be a rare gas such as Kr in addition to Xe.

As described above, the phosphor layer 139 may be roughly classified into a red phosphor layer 139R, a green phosphor layer 139G, and a blue phosphor layer 139B according to the color of visible light emitted. The red phosphor layer 139R is formed to include phosphors such as Y (V, P) O ₄ : Eu and the like, and the green phosphor layer 139G is formed to include phosphors such as Zn ₂ SiO ₄ : Mn and YBO ₃ : Tb. The blue phosphor layer 139B may be formed to include a phosphor such as BAM: Eu.

In the discharge cell C of the front substrate 120 employed in the plasma display panel 100 according to the present invention, an indium tin oxide (ITO) film existing on the front substrate of the conventional plasma display panel shown in FIG. A front dielectric layer 27 covering the transparent Y electrode 23a and the transparent X electrode 22a, the bus X electrode and the bus Y electrode 22b and 23b formed of metal, and the electrodes 22a, 22b, 23a and 23b. ) And the protective film 29 do not exist, so that the front transmittance of visible light is remarkably improved from about 60% to about 90%. Therefore, if the image is realized with the luminance of the conventional level, the electrodes provided in the plasma display panel are driven at a relatively low voltage, thereby improving the luminous efficiency.

In this case, since the first electrode 122 and the second electrode 123 serving as the X electrode and the Y electrode, respectively, are not disposed on the front substrate 120 through which visible light is transmitted, but are disposed on the side of the discharge space. As a discharge electrode, a low-resistance electrode, such as a metal electrode, can be used as a discharge electrode without using a transparent electrode having a high resistance, and thus the discharge response speed is increased, and low-voltage driving can be performed without distortion of the waveform.

In addition, since the discharge path of the ions between the first and second electrodes 122 and 123 is formed in parallel with the phosphor layer 139, the phosphor layer 139 is damaged during the sustain discharge as compared with the conventional plasma display panel. Low proportion

Hereinafter, a driving method of the plasma display panel having the above configuration will be described with reference to FIGS. 6 and 7. When an address voltage is applied between the address electrode 133 and the second electrode 123, an address discharge occurs, and as a result of this address discharge, the discharge cell C in which sustain discharge occurs is selected.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the second electrode 123 and the first electrode 122 of the selected discharge cell, a sustain discharge occurs between the second electrode 123 and the first electrode 122, Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet light excites the phosphor layer 139 coated in the discharge cell. The energy level of the excited phosphor layer 139 is lowered to emit visible light, and the emitted visible light forms an image.

That is, referring to FIG. 6, since the address discharge is disposed so that the first electrode 122 and the second electrode 123 intersect with the address electrode 133, the first electrode 122 and the address electrode 133. Alternatively, it may be caused by the second electrode 123 and the address electrode 133, but it is assumed here that an address discharge occurs between the second electrode 123 and the address electrode 133. A discharge cell to emit light, in which a predetermined pulse voltage is applied between the address electrode 133 and the second electrode 123 from an external power source, and the second electrode 123 and the address electrode 133 are alternately identified. C) is selected, and the selected discharge cell is discharged while the potential difference applied to the second electrode 123 and the address electrode 133 reaches a firing voltage, thereby on the inner side of the discharge cell. Wall charges accumulate in the

With reference to Fig. 7, the discharge discharge of the plasma display panel according to the embodiment of the present invention will be described by way of example. In general, sustain discharge means that in a discharge cell selected by an address discharge, a potential is applied to the sustain electrode pairs alternately a specific number of times to display a specific gray level, so that predetermined visible light is emitted from the discharge cell. As is the discharge of the step of implementing the image on the panel. At this time, in the sustain discharge, when a potential is applied to a plurality of sustain electrode pairs arranged in all the discharge cells alternately to form a voltage lower than the discharge start voltage, wall charges are accumulated only in the discharge cells in which the address discharge has occurred. As the potential difference formed by the wall charge and the sustain electrode pair is added to exceed the discharge start voltage, discharge occurs only in the discharge cell in which the address discharge has occurred, thereby generating visible light.

Referring to FIG. 7 to describe such sustain discharge, positive wall charges are stored on the inner side of the discharge cell, more specifically, on the inner side of the discharge cell in which the first electrode 122 is disposed by the address discharge. Negative wall charges are accumulated on the second electrode 123. In this case, a negative potential is applied to the first electrode 122 and a positive potential is applied to the second electrode 123.

Then, a positive potential is applied to the first electrode 122 and a negative potential is applied to the second electrode 123, so that a predetermined potential difference occurs. As a result, the dielectric of the first partition wall 127 is applied. It is polarized, and an electric field is formed inside the discharge cell C by this. At this time, according to the Gauss law, since the equipotential surface is formed on the surface of the conductor to which the same potential is applied, the same equipotential surface corresponding to the potential applied to the first electrode is formed on the entire first electrode surface, and the second electrode The same equipotential surface corresponding to the potential applied to the second electrode is formed on the entire surface.

At this time, the first electrode 122 is disposed to surround the first corner portion 127a of the first partition wall in one discharge cell, and the second electrode 123 is diagonal to the first corner portion 127a. Since it is arranged to surround the second corner portion 127b of the partition facing in the direction, the size of the electric field around the first corner portion 127a of the discharge cell wrapped around the first electrode is substantially the same size. An electric field is formed, and an electric field of the same size is formed around the second corner portion 127b of the discharge cell for the same reason. On the other hand, in the other corner portions 127c and 127d of the discharge cell except for the first corner portion 127a and the second corner portion 127b, hereinafter referred to as discharge corner portions, between the first electrode and the second electrode. A strong magnitude electric field is formed from the first electrode to the second electrode due to the potential difference generated according to the applied potential.

In addition, as the distance from the discharge corners 127c and 127d toward the center of the discharge cell C decreases, the size of the electric field decreases. This can be easily seen from the laws of physics that the magnitude of the electric field is proportional to the magnitude of the potential difference and inversely proportional to the spaced distance between the points at which the potential is applied. At this time, the discharge starts in a portion where the electric field is relatively strong, and the discharge extends to a portion where the electric field is relatively weak. Therefore, the discharge starts at the discharge corner and extends toward the center of the discharge cell.

Based on this reason, the wall charges stored in the discharge corners are moved along the direction of the electric field by the strong electric field formed in the discharge corners, and the discharge gas atoms and the walls in the discharge cells are moved by the movement of the wall charges. The charges collide, and the collision with the discharge gas due to the movement of the wall charges extends toward the center of the discharge cell C, thereby exciting the energy level of the discharge gas inside the discharge cell from the low energy level to the high energy level. . The energy level of the excited discharge gas is changed from the high energy level to the low energy level, thereby generating ultraviolet rays having a predetermined wavelength.

The ultraviolet light excites the phosphor layer 139 disposed in the discharge cell, more specifically, in the space defined by the second partition 137 and the dielectric layer 136, from a low energy level to a high energy level. In addition, the phosphor layer 139 changes from a high energy level to a low energy level, thereby generating predetermined visible light.

On the other hand, when the voltage difference between the first electrode 122 and the second electrode 123 is lower than the discharge voltage after the discharge is formed, the discharge is no longer generated, the space charge and the wall charge is discharge cell (C) Is formed. At this time, when the polarity of the pulse voltage between the discharge electrodes is changed and a voltage lower than the applied voltage is applied, the discharge starting voltage is reached again with the help of the wall charge, and the discharge is generated again. If the potential of the pulse voltage is alternately applied between the first electrode 122 and the second electrode 123 repeatedly, the discharge is maintained. In addition, a predetermined visible light is generated as many times as the number of discharges in the phosphor layer due to the potentials applied alternately to the first electrode 122 and the second electrode 123, thereby displaying a predetermined gray scale on the screen. . Through such a sustain discharge, a desired image can be finally realized on the plasma display panel. On the other hand, this driving example is only one example of the driving method of the first embodiment of the present invention, the description of the driving method described above does not limit or limit the features of the present invention.

According to the plasma display panel having the above structure, first, since there is no other element other than the substrate in the portion of the front substrate through which visible light passes, the aperture ratio can be significantly improved, and the transmittance can be improved at 60% or less. Up to about 90%.

Second, by minimizing the collision of ions with the phosphor layer during the sustain discharge, to prevent degradation of the phosphor layer to improve the life of the panel, increase the discharge area to increase the brightness, thereby increasing the efficiency of the panel.

Third, even when a high concentration of Xe gas is used as the discharge gas, the luminous efficiency can be improved. When using a high concentration of Xe gas as a discharge gas in order to increase the luminous efficiency, it is difficult to drive a low voltage, the low voltage can be driven as described above in the plasma display panel of the present invention, even when using a high concentration of Xe gas as a discharge gas It becomes possible to drive and can improve luminous efficiency.

Fourth, in the plasma display panel and the flat panel display device having the same, the discharge electrode is not disposed on the front substrate through which visible light is transmitted, but is disposed on the side of the discharge space, thereby increasing luminance.

In addition, as the structure of the plasma display panel is drastically changed as compared with the related art, the discharge region is greatly enlarged, and the amount of plasma is greatly increased to emit a lot of ultraviolet rays.

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 (7)

A front substrate and a rear substrate facing each other and disposed in front and rear, respectively; A first partition wall disposed between the front substrate and the rear substrate to form a plurality of corners to partition discharge cells together with the front substrate and the rear substrate, and a dielectric; First electrodes disposed in the first partition wall to surround a first corner part for each discharge cell; Second electrodes arranged side by side with a gap with the first electrodes in the first partition wall so as to surround a second corner portion facing the first corner portion for each discharge cell; A phosphor layer disposed in the discharge cell; And And a discharge gas in the discharge cell, Each of the first and second electrodes includes: a front end and a rear end; And a central portion positioned inside the first partition wall than the front and rear ends, and is concavely disposed from the side surface of the first partition wall into the first partition wall. The method of claim 1, From the front end to the rear end of the first electrode to the central portion, it has an inclination of 5 degrees to 40 degrees from the imaginary line perpendicular to the lower surface of the first partition wall in the first partition wall, And an inclination of 5 degrees to 40 degrees from an imaginary line perpendicular to the lower surface of the first partition to an inner portion of the first partition in a direction from the front end to the rear end of the second electrode. The method according to claim 1 or 2, The first electrode includes a first base portion disposed to extend in one direction for each discharge cell, and first protrusions protruding from the first base portion at the first corner portion for each discharge cell, The second electrode protrudes from the second base part at a second base part spaced apart in a direction parallel to the first base part for each of the discharge cells, and at a second corner part facing the first corner part for each discharge cell. And a second protrusion. The method of claim 3, wherein And a plurality of address electrodes arranged to extend in a direction crossing the direction in which the first base portion and the second base portion extend. The method of claim 4, wherein And the address electrode is disposed between the rear substrate and the phosphor layer, and a dielectric layer filling the address electrode is disposed between the phosphor layer and the address electrode. The method according to claim 1 or 2, And at least a side surface of the first partition wall is covered by a protective film. The method according to claim 1 or 2, A second partition wall is formed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall. And the phosphor layer is formed on a side surface of the second partition wall and an upper surface of the dielectric layer on which the second partition wall is not formed.

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