KR100751319B1 - Plasma display panel - Google Patents

Abstract

The present invention has a purpose of providing a plasma display panel having a structure that can adjust the color temperature and the address voltage margin, in order to achieve this, the present invention, the front substrate and the rear substrate facing each other disposed; A first partition wall disposed between the front substrate and the rear substrate with a plurality of corner portions, the discharge cells partitioning the discharge cells together with the front substrate and the rear substrate; The first base part disposed in the first partition wall and arranged to extend in one direction for each discharge cell and the first protrusion part protruding from the first base part at the first corner part of the corner parts are different from each other. First electrodes having a; The second base part is disposed in the first partition wall, and the second base part spaced apart in the direction parallel to the first base part for each discharge cell and the second corner part facing the first corner part so as to protrude from the second corner part are different from each other. Second electrodes having second protrusions protruding from the second base; An address electrode disposed on the rear substrate; A dielectric layer filling the address electrode; A phosphor layer disposed in the discharge cell; And a plasma display panel having a discharge gas in the discharge cell.

Description

Plasma display panel {Plasma display panel}

1 is a perspective view showing a conventional conventional plasma display panel,

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

3 is a plan view taken along line III-III of FIG. 2,

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

5 is a modification of FIG. 3,

6 is a cross-sectional view taken along line VI-VI of FIG. 2,

7 to 9 are plan views for explaining the driving 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

123a: second base 123b: second protrusion

127: first partition 129: shield

130: rear substrate 130r: rear substrate

133: address electrode 136: dielectric layer

137: second partition 139: phosphor layer

139R: red phosphor layer 139G: green phosphor layer

139B: blue phosphor layer C: discharge cell

Cr: red discharge cell Cg: green discharge cell

Cb: blue 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 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.

Fourth, in the conventional surface discharge plasma display panel 10, visible light generated from the red, green, and blue phosphors 39 has different luminance ratios, and red and green colors are different. If the number of sustain discharges in the discharge cells coated with the blue phosphor is the same, optimal color temperature cannot be realized.

In this case, the thickness of the front dielectric layer or the back dielectric layer is changed or the gap between the front dielectric layer and the back dielectric layer is changed for each discharge cell so that the sustain discharge number is different according to the type of phosphor in one discharge cell. Although the method can be considered, the optimum range of thickness of the front dielectric layer and the range of change of the gap distance between the front and rear dielectric layers have a certain limit. In particular, since the plasma display panel is light and short, the structural change as described above further reduces the effect.

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 capable of correcting color temperature without changing the driving circuit.

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 a preferred embodiment of the present invention includes: a front substrate and a rear substrate facing each other; A first partition wall disposed between the front substrate and the rear substrate to form a plurality of corner portions, the discharge cells partitioning discharge cells together with the front substrate and the rear substrate; The first base part disposed in the first partition wall and disposed to extend in one direction for each discharge cell and the protruding length for each discharge cell are different from each other at the first corner part of the corner parts. First electrodes having protruding first protrusions; The second base part disposed in the first partition wall, the second base part spaced apart in the direction parallel to the first base part for each discharge cell, and the second corner part facing the first corner part so as to protrude from the discharge cell. Second electrodes having second protrusions protruding from the second base at a corner; An address electrode disposed on the rear substrate; A dielectric layer filling the address electrode; A phosphor layer disposed in the discharge cell; And it provides a plasma display panel having a discharge gas in the discharge cell.

In this case, the phosphor layer includes, for each pixel, a red phosphor layer having a red phosphor, a green phosphor layer having a green phosphor, and a blue phosphor layer having a blue phosphor, and the first and second protrusions. It is preferable that each of the red, green, and blue discharge cells to which the red, green, and blue phosphor layers are coated protrudes at different lengths.

The protruding length of the first and second protrusions corresponding to the blue discharge cells among the first and second protrusions is the longest, or the protrusions of the first and second protrusions corresponding to the green discharge cells among the first and second protrusions. It may be the longest, in this case, it is preferable that the protruding length of the first and second protrusions corresponding to the red discharge cell of the first and second protrusions is the shortest.

The address electrode extends to cross the direction in which the first and second bases extend, and the red, green, and blue phosphor layers are formed on the side surfaces of the first and second electrodes of the first partition wall and the dielectric layer. Can be covered.

In addition, at least a side surface of the first partition wall may be covered by a protective film.

A second partition wall is formed between the first partition wall and the rear substrate to partition the discharge cells together with the first partition wall, and the phosphor layer is formed on a side of the second partition wall and the dielectric layer on which the second partition wall is not formed. Can be covered.

Next, the plasma display panel according to the first 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 the first embodiment of the present invention includes a front substrate 120, a rear substrate 130, a first partition 127, and a first electrode 122. ), A second electrode 123, a second partition 137, a phosphor layer 139, and a discharge gas.

The transparent front substrate 120 is disposed in parallel with 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 discharge cell C includes a red discharge cell Cr disposed on a subpixel in which a red phosphor layer 139R emitting red visible light is formed, and a green phosphor layer 139G emitting green visible light. One of the green discharge cells Cg disposed in the subpixels and the blue discharge cells Cb disposed in the subpixels in 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. 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 first electrode 122 and the second electrode 123 extend in one direction in the first partition 127. The first electrode 122 includes a first base 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 second corner portion 127b facing the first corner portion 127a, for example, in the y-axis direction in the drawing.

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. The second electrode 123 may surround the first corner portion 127b facing the first corner portion 127a of the discharge cell C surrounded by the first electrode in a diagonal direction. Is disposed within.

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 connected 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 first barrier material.

In this case, the first partition 127 may be formed of a glass component including an element such as Pb, B, Si, Al, and O, and the like, if necessary, such as ZrO 2, TiO 2, and Al 2 O 3. It may be formed of a dielectric including a filler and pigments such as Cr, Cu, Co, Fe, TiO 2, and the like, which induces charged particles by a potential applied to the discharge electrode and participates in discharge by wall charge. Induces and serves to protect 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 back surface of the first partition wall. However, the protective film formed on the rear surface 120r of the front substrate and the rear surface 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, ZrO2 Fillers such as, TiO 2, and Al 2 O 3 and pigments such as Cr, Cu, Co, Fe, TiO 2 may be included.

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 is mis-discharged between discharge cells C corresponding to one subpixel among red discharge cells Cr, green discharge cells Cg, and blue discharge cells Cb constituting a unit pixel. Prevent it from happening.

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 be partitioned into other shapes 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.

An address electrode disposed in the front surface 130f of the rear substrate 130 and extending to cross the first and second electrodes 122 and 123 and extending in the y axis direction across the discharge cells C in the drawing. 133 may be formed, and the address electrodes may be covered by the dielectric layer 136.

In this case, the address electrode 133 is formed to cross the direction in which the first and second base portions 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 column of the discharge cells C through which the address electrode 133 passes, and the second electrode 123 pass through This means that the columns of the discharge cells C cross each other. In addition, the first electrode 122 extends in parallel with the second electrode 123, which means that the first electrode 122 is disposed together with the second electrode 123 at regular intervals.

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 because 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, YBO 3: Tb, and the like. The phosphor layer 139B may be formed to include a phosphor such as BAM: Eu.

The red discharge cell Cr on which the red phosphor layer 139R is disposed is a red subpixel, the green discharge cell Cg on which the green phosphor layer 139G is disposed is a green subpixel, and the blue phosphor layer 139B is The disposed blue discharge cells Cb function as blue subpixels. The red subpixels, the green subpixels, and the blue subpixels form a unit pixel to form a unit pixel, thereby forming a color according to a combination of three primary colors. Will be represented.

More specifically, the luminance of the red, green, and blue light that can be emitted from the red, green, and blue phosphor layers 139R, 139G, and 139B, respectively, is subdivided into a plurality of steps, for example, 256 levels, respectively. When red, green, and blue light are added and mixed in various combinations, 1677 million colors can be expressed from a unit pixel. In this case, if the grays of red (R), green (G), and blue (B) are 256 grays, for example, black display is performed when all of the RGB grays are 0, and all of the red, green, and blue grays. In the case of 256 gradations, white display is performed. In addition, when the gray scales of RGB do not fill 256 gray scales but all are the same, a white display (gray) having low luminance is displayed.

In general, it is preferable that the color temperature of white formed of three primary colors is set to an optimal color temperature value according to each condition, for example, in the case of 9000K to 1000K being evaluated as suitable for Asian people.

In general, a color temperature refers to a temperature when an object shines with visible light and the color looks like a color radiated by a black body at a certain temperature. In other words, the color temperature of the object is expressed by the temperature of the black body of the same color light (absolute temperature K). In the case of blue, the color temperature is the largest, followed by the green and the red. In other words, when the luminance in the blue discharge cell Cb increases, the color temperature increases. In contrast, when the luminance in the red discharge cell Cr increases, the color temperature decreases.

Therefore, by controlling the amount of visible light emitted from the red, green, and blue phosphor layers 139R, 139G, and 139B provided in the plasma display panel, the color temperature at one pixel may be controlled. If the discharge surface (Cr, Cg, Cb) of the discharge surface area of the first and second electrodes 122, 123 are different from each other and the number of times of sustain discharge is changed, the amount of visible, red, green, and blue visible light is emitted. This can be adjusted to correct the color temperature in each condition.

That is, in the present invention, the protruding lengths of the second electrodes 123 located in the red, green, and blue discharge cells Cr, Cg, and Cb are different from each other. When the protruding lengths of the first and second protrusions 122b and 123b become long, the surface area of the electrode participating in the discharge increases. As a result, the sustain discharge path is shortened, the discharge surface area is increased, and the amount of sustain discharge is increased. As a result, the amount of ultraviolet rays emitted by the sustain discharge increases, so that a lot of visible light is emitted from the phosphor layer 139, thereby increasing the luminance in the discharge cell (C).

On the other hand, when the protruding length of the first and second protrusions 122b and 123b is shortened, the surface area of the electrode participating in the discharge is reduced. As a result, the sustain discharge path becomes long and the discharge surface area becomes small, thereby reducing the amount of sustain discharge. As a result, the amount of ultraviolet rays emitted by the sustain discharge becomes small, so that the visible light is emitted in the phosphor layer 139, thereby reducing the luminance in this discharge cell.

Typically, when the same sustain discharge occurs in each discharge cell, the white color temperature is 7500K. In this case, in order to achieve a white color temperature of 9000K to 1000K suitable for Asians, it is necessary to increase the luminance of the blue discharge cells.

Accordingly, as shown in FIGS. 3 and 4, the protruding lengths of the first and second protrusions 122b_b and 123b_b corresponding to the blue discharge cells may be set to the first and second protrusions 122b_r, 123b_r and 122b_g corresponding to the other discharge cells. , 123b_g), the number of visible rays emitted from the blue discharge cell Cb increases accordingly, resulting in a large amount of light in one pixel, thereby increasing the white color temperature.

In addition, when the protruding lengths of the first and second protrusions 122b_r and 123b_r corresponding to the red discharge cells Cr are smaller than the first and second protrusions corresponding to the other discharge cells, red light is emitted from one pixel. The less light, the greater the white color temperature.

On the other hand, due to the difference in the characteristics of the phosphor as described above, the address voltage margin required to excite the red, green, blue phosphor layers (139R, 139G, 139B) may vary. Here, the address voltage margin refers to the difference between the upper limit value and the lower limit value of the address voltage capable of maintaining a stable discharge state. When the address voltage margin of the phosphor layer having the smallest address voltage margin is increased, address discharge can be stably performed. Thus, as shown in FIG. 5, the phosphor layer having the smallest address voltage margin is commonly known as green. The protruding lengths of the first and second protrusions 122b_g and 123b_g corresponding to the discharge cells Cg in which the phosphor layer 139G is disposed are lengthened, so that the separation distances between the first and second electrodes in the discharge cells are different. The red and blue phosphor layers 139R and 139B, which are phosphor layers, may be shorter than a distance between the first electrode and the second electrode corresponding to at least one of the discharge cells Cr and Cb. Can be configured.

In the conventional surface discharge type plasma display panel, when the X and Y electrodes 22 and 23 are disposed too close to each other, unnecessary interference occurs between the X and Y electrodes 22 and 23, so that the discharge path is discharged. It becomes short and the light emitting area is limited, so that the amount of ultraviolet light is decreased, so that the luminance is lowered. On the contrary, when the X and Y electrodes 22 and 23 are disposed farther than necessary, the initial discharge voltage increases, and the discharge capacity is impaired. Therefore, the X and Y electrodes 22 and 23 disposed on the front substrate must have a constant gap, and thus it is practically difficult to change the surface area of the X and Y electrodes 22 and 23. However, according to the present invention, since the first and second electrodes 122 and 123 discharge to each other and the opposite corners of the discharge cells have a constant gap, the protrusions of the first and second protrusions 122b and 123b may be changed. Can be.

In addition, in the discharge cell C of the front substrate 120 adopted in the plasma display panel 100 according to the present invention, ITO (indium tin oxide) existing in the front substrate of the conventional plasma display panel shown in FIG. A front dielectric layer covering the transparent Y electrode 23a and transparent X electrode 22a formed of a film, the bus X electrode and bus Y electrodes 22b and 23b formed of metal, and the electrodes 22a, 22b, 23a and 23b. (27) 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, when the image is implemented at the luminance of the conventional level, the electrodes 122 and 123 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. Since 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 as a discharge electrode, the discharge response speed is increased and low voltage driving can be performed without distortion of the waveform.

Hereinafter, a driving method of the plasma display panel having the above configuration will be described. 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.

This will be described in detail with reference to FIGS. 6 to 9. The address discharge of the present invention will be described with reference to FIG. In general, an address discharge is a discharge voltage generated by applying a pulse voltage to the crossing electrode pairs to emit light of the discharge cells specified by the crossing electrode pairs in order to select the discharge cells to be implemented. It refers to a discharge that selects a discharge cell in which discharge should occur by accumulating wall charges on the inner surface of the discharge cell by the address discharge.

The address discharge is disposed so that the first electrode 122 and the second electrode 123 intersect the address electrode 133, and thus, the first electrode 122 and the address electrode 133 or the second electrode 212. ) 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. The discharge cell C 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 to be identified by the intersection of the second electrode 123 and the address electrode 133. ) 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 the firing voltage, thereby on the inner side of the discharge cell. Wall charges accumulate.

7 to 9, the sustain 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, the discharge occurs only in the discharge cell in which the address discharge occurs, 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, as shown in FIG. 8, a predetermined potential difference occurs as a positive potential is applied to the first electrode 122 and a negative potential is applied to the second electrode 123. The dielectric of the one partition 127 is polarized, whereby an electric field is formed inside the discharge cell C. 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 first partition wall facing in the direction, the magnitude of the electric field around the first corner portion 127a of the discharge cell wrapped around the first electrode is substantially the same. An electric field of the same size 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. As the charges collide, the collision with the discharge gas due to the movement of the wall charges extends toward the center of the discharge cell C as shown in FIG. 9, and the energy level of the discharge gas inside the discharge cell is increased at a low energy level. Will be excited at a 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 varying the protruding length of the electrodes disposed in the partition wall for each discharge cell, the color temperature and the address discharge voltage margin can be easily corrected.

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, the discharge response speed is high and low voltage driving is possible. In the plasma display panel and the flat panel display device having the same according to the present invention, since the discharge electrode is not disposed on the front substrate through which visible light is transmitted, the discharge electrode is disposed on the side of the discharge space. Therefore, it is necessary to use a transparent electrode having high resistance as the discharge electrode. Since a low-resistance electrode such as a metal electrode can be used as the discharge electrode, the discharge response speed is high, and low-voltage driving is possible without distortion of the waveform.

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 (8)

A front substrate and a rear substrate disposed to face each other; A first partition wall disposed between the front substrate and the rear substrate to form a plurality of corner portions, the discharge cells partitioning discharge cells together with the front substrate and the rear substrate; The first base parts disposed in the first partition wall and arranged to extend in one direction for each of the discharge cells and the first base parts in the first corner part of the corner parts are different from each other so as to protrude from the first base parts. First electrodes having first protrusions protruding from the first electrode; A second base portion disposed in the first partition wall and spaced apart in a direction parallel to the first base portion, and a second facing portion of the first corner portion so that the lengths protruding from the discharge cells are different from one discharge cell; Second electrodes having second protrusions protruding from the second base at a corner; An address electrode disposed on the rear substrate; A dielectric layer filling the address electrode; A phosphor layer disposed in the discharge cell; And And a discharge gas in the discharge cell. The method of claim 1, The phosphor layer is composed of a red phosphor layer having a red phosphor, a green phosphor layer having a green phosphor, and a blue phosphor layer having a blue phosphor, And wherein the first and second protrusions protrude to different lengths for each of the red, green, and blue discharge cells to which the red, green, and blue phosphor layers are applied. The method of claim 2, And wherein the protruding length of the first and second protrusions corresponding to the blue discharge cells is the longest among the first and second protrusions. The method of claim 2, And a protruding length of the first and second protrusions corresponding to the green discharge cells is the longest among the first and second protrusions. The method according to claim 3 or 4, And wherein the protruding length of the first and second protrusions corresponding to the red discharge cells is shortest among the first and second protrusions. The method of claim 1, The address electrode extends to cross the direction in which the first and second bases extend. And wherein the phosphor layers are respectively covered on the side surfaces of the heights lower than the first and second electrodes of the first partition and on the dielectric layer. The method of claim 1, And at least a side surface of the first partition wall is covered by a protective film. The method of claim 1, 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 covered on a side surface of the second partition wall and a dielectric layer on which the second partition wall is not formed.

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