KR20050104266A - Plasma display panel - Google Patents

Abstract

Compared to the conventional plasma display panel, the present invention significantly improves the aperture ratio and transmittance, significantly enlarges the discharge surface, and greatly expands the discharge region, and has a structure capable of correcting the color temperature without correcting the driving circuit. In order to achieve the above object, the present invention provides a display panel comprising: a transparent front substrate; A rear substrate disposed in parallel with the front substrate; A first partition wall disposed between the front substrate and the rear substrate and partitioning the red discharge cells, the green discharge cells, and the blue discharge cells together with the front substrate and the back substrate, the first partition formed of a dielectric; Front discharge electrodes disposed in the first partition wall to surround the discharge cell; Rear discharge electrodes disposed in the first partition wall to surround the discharge cells, and spaced apart from the front discharge electrodes; A second partition wall disposed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall; A phosphor layer disposed in each of red, green, and blue discharge cells, the phosphor layer including a red phosphor layer, a green phosphor layer, and a blue phosphor layer having different discharge surface areas; And a discharge gas in the discharge cell.

Description

Plasma display panel {Plasma display panel}

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.

Fourthly, in the conventional surface discharge plasma display panel 10, a rear dielectric layer 35 is disposed on a lower surface of the phosphor layer 39, and the address electrode 33 is embedded in the rear dielectric layer 35. Since the thickness of the rear dielectric layer must be maintained at a predetermined level or more, it is difficult to change the structure of the rear dielectric layer or the rear substrate, in particular, for color temperature correction.

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, such as the center portion, to efficiently use the space charge of the plasma, it is possible to drive low voltage, significantly improve the luminous efficiency, and permanent The present invention provides a plasma display panel that can drastically reduce an afterimage phenomenon.

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

Transparent front substrate;

A rear substrate disposed in parallel with the front substrate;

A first partition wall disposed between the front substrate and the rear substrate and partitioning red discharge cells, green discharge cells, and blue discharge cells together with the front substrate and the back substrate;

Front discharge electrodes disposed in a first partition wall to surround the discharge cell;

Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode;

A second partition wall disposed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall;

A phosphor layer disposed in each of the red, green, and blue discharge cells, the phosphor layer including a red phosphor layer, a green phosphor layer, and a blue phosphor layer having different discharge surface areas; And

And a discharge gas in the discharge cell.

In this case, the thickness of the back substrate is the same for each discharge cell, and on the back substrate, red, green, and blue phosphor coating layers having different thicknesses are formed for each of the red, green, and blue discharge cells. The green, blue and blue phosphor layers may be applied on the same level side of the second partition and the red, green, and blue phosphor coating layers. In this case, the second partition and the phosphor coating layer may be integrated as the same material. It is preferable to form.

In contrast, the red, green, and blue phosphor layers are coated on the red, green, and blue back substrates having the same level side surfaces of the second partition walls and the second partition walls, respectively, from the rear surface of the rear substrate. The thickness up to the front of each of the red, green, and blue back substrates may be different.

The thickness from the rear surface of the rear substrate to the rear surface of the phosphor layer is preferably thick in order of the red back substrate, the green back substrate, and the blue back substrate.

In addition, the red, green, and blue phosphor layers are respectively applied on the red, green, and blue back substrates having the same level side surfaces of the second partition walls and the second partition walls, and from the rear surface of the back substrate. It is preferable that the thicknesses of the front and rear surfaces of the green, blue and blue back substrates are different from each other.

In this case, the thickness from the rear surface of the rear substrate to the front surface of each of the red, green and blue back substrates is preferably thick in order of the red back substrate, the green back substrate, and the blue back substrate.

On the other hand, it is preferable that the front discharge electrodes extend in one direction, and the rear discharge electrodes extend to cross the front discharge electrode.

The first partition further includes an address electrode formed to be spaced apart from the front and rear discharge electrodes to surround the discharge cell, and the front discharge electrodes and the rear discharge electrodes extend in one direction. Preferably, the electrode extends to intersect the front discharge electrode and the rear discharge electrode.

In this case, it is preferable that the front discharge electrode and the rear discharge electrode have a ladder shape, and at least the side surface of the first partition wall is covered by a protective film.

The first partition wall and the second partition wall may be integrally formed.

On the other hand, the plasma display panel according to the second embodiment of the present invention is:

Transparent front substrate;

A rear substrate disposed in parallel with the front substrate;

A first partition wall disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate and formed of a dielectric;

Front discharge electrodes disposed in a first partition wall to surround the discharge cell;

Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode;

A second partition wall disposed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall;

Protrusions formed on the rear substrate in different numbers according to the blue discharge cells, the green discharge cells, and the red discharge cells;

A phosphor layer having red, green, and blue phosphor layers coated on the red, green, and blue back substrates including the protrusions, without forming side surfaces of the second partition and the second barrier walls; And

And a discharge gas in the discharge cell.

Preferably, the protrusions are provided with a plurality of protrusions in order of blue discharge cells, green discharge cells, and red discharge cells.

In this case, the protrusion is preferably made of the same material as the second partition wall.

Here, the front discharge electrodes may extend in one direction, and the rear discharge electrodes may extend to cross the front discharge electrode.

Alternatively, the front discharge electrodes and the rear discharge electrodes may extend in one direction, and further include address electrodes extending to intersect the front discharge electrode and the rear discharge electrode. In this case, the address electrode may have a rear substrate. And a phosphor layer, a dielectric layer is disposed between the phosphor layer and the address electrode, and the protrusion is formed on the dielectric layer.

In this case, the protrusion is preferably made of the same material as the dielectric layer.

Meanwhile, the first partition wall and the second partition wall may be integrally formed.

The front discharge electrodes and the rear discharge electrodes may each have a ladder shape, and at least a side surface of the first partition wall may be covered by a protective film.

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 5, 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 front discharge electrode 122. ), A rear discharge 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 and the rear substrate. The first partition 127 is disposed in the non-discharge unit to partition the discharge cell. The discharge cell refers to one of a red discharge cell disposed in a subpixel having a red phosphor, a green discharge cell disposed in a subpixel having a green phosphor, and a blue discharge cell disposed in a subpixel having a blue phosphor. In the first partition wall, the front discharge electrode 122 and the rear discharge electrode 123 are formed to surround the discharge cell.

A second partition 137 is formed between the first partition 127 and the rear substrate 130, and the second partition 137 functions to prevent crosstalk of charged particles. The phosphor layer 139 is disposed in the space defined by the second partition 137. Discharge gas (not shown) exists in the discharge cell.

The back substrate 130 is usually made of a material mainly composed of glass.

The first partition wall 127 partitions adjacent discharge cells C, and is formed of a dielectric material to prevent the rear discharge electrode 123 and the front discharge electrode 122 from being directly energized during sustain discharge. Prevents direct collision with the electrodes 122 and 123 to damage them, and induces charged particles to accumulate wall charges.

The first partition 127 is preferably covered by a protective film 129. The passivation layer 129 is not an essential component, but it prevents the charged particles from colliding with the first partition 127 and damaging the first partition. It is preferable.

The second partition wall 137 prevents mis-discharge between discharge cells C corresponding to one subpixel among red discharge cells, green discharge cells, and blue discharge cells constituting a unit pixel.

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.

The front discharge electrode 122 and the rear discharge electrode 123 may be disposed to cross each other. In this case, one of the front discharge electrode 122 and the rear discharge electrode 123 serves as an address electrode for causing an address discharge, and At the same time, it can serve as a sustain electrode causing sustain discharge.

2, in addition to the front discharge electrode and the rear discharge electrode, an address electrode 133 may be further provided in the first partition 127. In this case, the front discharge electrode 122 and the rear may be further provided. The discharge electrodes 123 extend in one direction in parallel with each other, and the address electrodes 133 extend to cross the front discharge electrodes 122 and the rear discharge electrodes 123. If the address electrode 133 is provided in the plasma display panel 100, the rear discharge electrode 123 and the front discharge electrode 122 are electrodes for sustain discharge, and implement an image of the plasma display panel between the electrodes. Maintenance discharge occurs.

The rear discharge electrode 123 and the front discharge electrode 122 may be formed of a conductive metal such as aluminum or copper. The extension of the rear discharge electrode 123 to intersect the address electrode means that the column of discharge cells C through which the address electrode passes and the column of discharge cells C through which the rear discharge electrode passes. to be. In addition, the front discharge electrode 122 extends in parallel with the rear discharge electrode 123, which means that the front discharge electrode is disposed together with a predetermined distance from the rear discharge electrode.

In the present embodiment, the rear discharge electrode 123, the front discharge electrode 122, 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.

In FIG. 2, the rear discharge electrode 123, the front discharge electrode 122, and the address electrode 133 are each formed as one electrode. In contrast, the rear discharge electrode, the front discharge electrode, and the address electrode each have two or more sub-electrodes. It may be provided.

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.

The front substrate 120 is made of a material having good light transmittance such as glass.

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 includes phosphors such as Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the like. The blue phosphor layer 139B may include a phosphor such as BAM: Eu.

The red discharge cell C _R on which the red phosphor layer 139R is disposed is a red subpixel, and the green discharge cell C _G on which the green phosphor layer 139G is disposed is a green subpixel, and the blue phosphor layer 139B. ), The blue discharge cells C _B are arranged to function as blue subpixels. The red subpixels, the green subpixels, and the blue subpixels form a unit pixel to form a unit pixel. It will express the color accordingly.

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. That is, the color temperature of the object is expressed by the temperature (absolute temperature K) of the black body of the same color light. In the case of blue, the color temperature is the largest, followed by the green and the red.

Therefore, the color temperature can be adjusted by adjusting the amount of visible light emitted from the red, green, and blue phosphor layers 139R, 139G, and 139B provided in the plasma display panel.

That is, by varying the discharge surface areas of the red, green, and blue phosphor layers, the discharge surface areas of the phosphor layers are respectively different, thereby adjusting the amount of red, green, and blue visible light emitted to control the color temperature. Can be corrected. Here, the discharge surface area of the phosphor layer refers to the surface area of the phosphor layer capable of emitting visible light when the front discharge electrode and the rear discharge electrode encounter ultraviolet rays generated by generating a sustain discharge.

In this case, as shown in FIG. 3, the thickness of the back substrate is the same for each discharge cell, and on the back substrate, red, green, and blue phosphors having different thicknesses for each of the red, green, and blue discharge cells. Coating layers 136R, 136G, and 136B are formed, and the red, green, and blue phosphor layers 139R, 139G, and 139B have the same level side surfaces of the second partition 137 and the red, green, and blue phosphors, respectively. It can be applied on the application layer.

In this case, it is preferable that the second partition 137 and the phosphor coating layer 136 are integrally formed as the same material, so that the phosphor coating layer can be simply manufactured.

That is, assuming that the discharge surface area is made small in order of the blue phosphor layer 139B, the green phosphor layer 139G, and the red phosphor layer 139R, the integral second partition wall 137 and the phosphor coating layer 136 are formed. For example, in the case of using a sand blast method, first, a second partition material having a thickness of the second partition wall is coated on the back substrate 130. Thereafter, the second partition wall material is blasted to a thickness of a red phosphor coating layer in a state in which a photosensitive film is coated.

Thereafter, the photosensitive film is again blasted to the thickness of the green phosphor coating layer while being coated on the second barrier rib and the red phosphor coating layer. Finally, the photoresist film is blasted to the thickness of the blue phosphor coating layer in a state in which the photosensitive film is coated on the second phosphor, the red phosphor coating layer and the green phosphor coating layer, thereby forming the same material as that of the second partition wall and having different thicknesses from each other. An application layer can be formed.

Unlike FIG. 3, the red, green, and blue phosphor layers may be formed by varying the thicknesses of the red, green, and blue back substrates 130R, 130G, and 130B located in the red, green, and blue discharge cells, respectively. The discharge surface areas of 139R, 139G, and 139B may be different. That is, the red, green and blue discharge cells are formed to have different thicknesses from the rear surface 130r of the rear substrate disposed at the same position to the front surface of each of the red, green and blue rear substrates. The blue phosphor layers 139R, 139G, and 139B are applied on the red, green, and blue back substrates 130R, 130G, and 130B having the same level side surfaces of the second partition wall 137 and the second partition wall, respectively. As a result, the color temperature can be easily corrected by varying the discharge surface areas of the red, green, and blue phosphor layers.

That is, as shown in FIG. 1, in the conventional AC three-electrode surface discharge plasma display panel 10, the phosphor layer 39 is coated on the back dielectric layer 35, and the back dielectric layer is disposed on the address electrode 33. Is applied. Therefore, in order to generate the optimum address discharge, a rear dielectric layer having a constant thickness must be provided, so that the thickness of the rear dielectric layer cannot be arbitrarily changed. However, in the present invention, since the address electrode is not disposed on the back of the phosphor layer, the discharge surface area of the phosphor layer can be easily changed.

Herein, in order to correct the color temperature value, it is preferable that the most visible blue light is emitted to the outside and the least visible red light is emitted to the outside. Accordingly, the thicknesses D _R , D _G , and D _B from the rear surface 130r of the rear substrate to the rear surfaces 139Rr, 139Gr, and 139Br of the phosphor layer are in order of the red discharge cells, the green discharge cells, and the blue discharge cells. It is preferable to be thick, which can be confirmed through the following experimental example.

Experimental Example 1

In the plasma display panel having the structure of the present invention, the luminance and total white color temperature of the red, green, and blue discharge cells when the discharge surface areas of the red, green, and blue phosphor layers 139R, 139G, and 139B were all the same were measured. . As a result, as shown in [Table 1], the white color temperature is 7500K.

Red discharge cell Green discharge cell Blue discharge cell Full white discharge cell Luminance (cd / m ² ) 65.7 174.0 25.3 265 Color temperature (K) 7500

Experimental Example 2

In the plasma display panel according to the first embodiment of the present invention, the discharge surface area of the blue phosphor layer 139B is the same as that of Experimental Example 1, and the discharge surface area of the red phosphor layer 139R is the smallest. In the case of red, green, blue discharge cells (C _R , C _G , C _B ), the brightness and the total white color temperature were measured under the same conditions as in Experimental Example 1.

Red discharge cell Green discharge cell Blue discharge cell Full white discharge cell Luminance (cd / m ² ) 52.6 153.1 25.3 231 Color temperature (K) 9400

As a result, as shown in Table 2, as the discharge surface areas of the red phosphor layer and the green phosphor layer decrease, the overall luminance decreases. This is because the luminance is proportional to the discharge area of the phosphor layer.

On the other hand, it can be seen that the white color temperature is 9400K increased compared to 7500K of Experimental Example 1. That is, by making the discharge surface area of the white phosphor layer the largest and the discharge surface area of the red phosphor layer the smallest, the light turns blue and the white color temperature becomes large.

In the discharge cell C of the front substrate 120 employed in the plasma display panel 100 having such a structure, 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, 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, the front discharge electrode 122 and the rear discharge 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. For convenience of explanation, the address electrode 133 is disposed in the first partition wall, the rear discharge electrode 123 serves as the Y electrode causing the address discharge with the address electrode, and the front discharge electrode 122 is the rear discharge electrode. It acts as an X electrode causing over discharge and sustain discharge.

In this case, an address discharge is generated by applying an address voltage between the address electrode 133 and the rear discharge electrode 123, 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 of AC is applied between the rear discharge electrode 123 and the front discharge electrode 122 of the selected discharge cell, a sustain discharge occurs between the rear discharge electrode 123 and the front discharge electrode 122, Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 139 coated in the discharge cell. The energy level of the excited phosphor layer is lowered to emit visible light, and the emitted visible light forms an image.

Meanwhile, the plasma display panel 200 according to the second exemplary embodiment of the present invention is illustrated in FIGS. 6 and 7. In this case, differences from the plasma display panel 100 according to the first embodiment of the present invention will be mainly described.

In the plasma display panel 200 according to the second embodiment of the present invention, the surface areas of the red, green, and blue phosphor layers 239R, 239G, and 239B are changed by forming the protrusions 236 on the front substrate. . That is, on the rear substrate, different numbers of protrusions 236 are formed for each of the blue discharge cells Cr, the green discharge cells C _G , and the red discharge cells C _B. In this case, the same level side surface of the second partition wall 237 and the second partition wall are not formed, and red, green, and blue back substrates 230R, 230G, and 230B including the protrusion 236 are respectively formed of red, Green and blue phosphor layers 239R, 239G, and 239B are provided.

That is, in the discharge cell in which the protrusion part 236 was formed, since the fluorescent substance layer 239 is apply | coated including the protrusion part, the discharge surface area of the fluorescent substance layer increases as the number of protrusion parts increases. This has the same effect as the structure of varying the thickness of the red, green, blue phosphor coating layer or the thickness of the front substrate in the plasma display panel according to the first embodiment of the present invention.

In this case, in order to increase the color temperature, the protrusions are preferably formed in the order of the blue discharge cells (C _R ), the green discharge cells (C _G ), and the red discharge cells (C _B ) in order, and therefore, blue, green, and red phosphors. This is because the discharge surface area becomes large in order.

In this case, it is easy in the manufacturing process that the protrusion 236 and the second partition 237 are made of the same material.

The address electrodes 233 may be disposed between the rear substrate 230 and the phosphor layer 239, and a dielectric layer may be disposed between the phosphor layer and the address electrode. In this case, the address electrodes 233 are used to generate an address discharge for facilitating sustain discharge between the front discharge electrode 222 and the rear discharge electrode 223. More specifically, the address electrodes 233 may be configured to generate a voltage at which the sustain discharge starts. It acts to lower.

In addition, the rear discharge electrode 223 and the front discharge electrode 222 are electrodes for sustain discharge, and a sustain discharge that implements an image of the plasma display panel occurs between the electrodes. The rear discharge electrode 223 and the front discharge electrode 222 are formed of a conductive metal such as aluminum or copper and extend to cross the address electrode.

In this case, the rear discharge electrode 223 and the front discharge electrode 222 extend to intersect with the address electrode. As shown in FIG. 8, the heat of the discharge cells C through which the address electrode passes passes forward discharge. This means that the electrodes 222 and the rear discharge electrodes 223 intersect with the rows of the discharge cells C passing therethrough. In addition, the front discharge electrode 222 extends in parallel with the rear discharge electrode 223 means that the front discharge electrode is disposed together with a predetermined distance from the rear discharge electrode.

In this case, it is preferable that the protrusion 236 is made of the same material as the dielectric layer on the dielectric layer 235, which acts as an obstacle at the time when address discharge occurs by forming the protrusion 236 as the dielectric layer 235. This is because the manufacturing process is simple.

Meanwhile, the first partition 227 and the second partition 237 may be integrally formed.

In addition, it is preferable that at least the side surface of the first partition 227 is covered by the protective film 229.

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 changing the surface area of the phosphor layer, it is possible to easily correct the color temperature value without changing the number of sustain discharges for each discharge cell.

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.

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

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

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

4 is a modification of FIG.

5 is a cross-sectional view taken along the line VV of FIG. 4,

6 is a perspective view showing a plasma display panel according to a second embodiment of the present invention;

7 is a cross-sectional view taken along the line VII-VII of FIG. 6,

FIG. 8 is a perspective view illustrating electrodes adopted in the plasma display panel of FIG. 6.

Explanation of symbols on main parts of drawing

100, 200: plasma display panel 120, 220: front substrate

122, 222: front discharge electrode 123, 223: rear discharge electrode

127, 227: First bulkhead 129, 229: protective shield

130, 230: rear substrate 130r: rear substrate

133 and 233: address electrode 136: phosphor coating layer

137, 237: second partition 139, 239: phosphor layer

139R, 239R: red phosphor layer 139G, 239G: green phosphor layer

139B, 239B: blue phosphor layer 139, 239: phosphor layer

235 dielectric layer 236 protrusions

C: discharge cell C _R : red discharge cell

C _G : green discharge cell C _B : blue discharge cell

D _R : thickness from back substrate to back of red phosphor layer

D _G : Thickness from rear substrate to back of green phosphor layer

D _B : Thickness from back substrate to back of blue phosphor layer

Claims (17)

Transparent front substrate; A rear substrate disposed in parallel with the front substrate; A first partition wall disposed between the front substrate and the rear substrate and partitioning red discharge cells, green discharge cells, and blue discharge cells together with the front substrate and the back substrate; Front discharge electrodes disposed in a first partition wall to surround the discharge cell; Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode; A second partition wall disposed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall; A phosphor layer disposed in each of the red, green, and blue discharge cells, the phosphor layer including a red phosphor layer, a green phosphor layer, and a blue phosphor layer having different discharge surface areas; And And a discharge gas in the discharge cell. The method of claim 1, The thickness of the back substrate is the same for each discharge cell, On the back substrate, red, green, and blue phosphor coating layers having different thicknesses are formed for each of the red, green, and blue discharge cells, And the red, green, and blue phosphor layers are applied on side surfaces of the same level of the second partition and the red, green, and blue phosphor coating layers, respectively. The method of claim 2, And the second barrier rib and the phosphor coating layer are integrally formed of the same material. The method of claim 1, The rear surface of the back substrate is substantially flat, The thicknesses of the red, green, and blue back substrates located in the red, green, and blue discharge cells, respectively, from the rear side to the front side are different from each other. And the red, green, and blue phosphor layers are applied on the red, green, and blue back substrates on which side surfaces of the second partition and the second partition are not formed. The method according to claim 2 or 4, And a thickness from a rear surface of the back substrate to a rear surface of the phosphor layer is thick in order of the red back substrate, the green back substrate, and the blue back substrate. The method of claim 1, And the front discharge electrodes extend in one direction, and the rear discharge electrodes extend to cross the front discharge electrode. The method of claim 1, The first partition further includes an address electrode formed to be spaced apart from the front and rear discharge electrodes to surround the discharge cell. And the front discharge electrodes and the rear discharge electrodes extend in one direction, and the address electrode extends to intersect the front discharge electrode and the rear discharge electrode. The method of claim 1, The front discharge electrode and the rear discharge electrode has a ladder shape, And at least a side surface of the first partition wall is covered by a protective film. Transparent front substrate; A rear substrate disposed in parallel with the front substrate; A first partition wall disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate and formed of a dielectric; Front discharge electrodes disposed in a first partition wall to surround the discharge cell; Rear discharge electrodes disposed in a first partition wall to surround the discharge cell and spaced apart from the front discharge electrode; A second partition wall disposed between the first partition wall and the rear substrate to partition the discharge cell together with the first partition wall; Protrusions formed on the rear substrate in different numbers according to the blue discharge cells, the green discharge cells, and the red discharge cells; A phosphor layer having red, green, and blue phosphor layers coated on the red, green, and blue back substrates including the protrusions, without forming side surfaces of the second partition and the second barrier walls; And And a discharge gas in the discharge cell. The method of claim 9, And wherein the protrusions are provided with a plurality of protrusions in order of blue discharge cells, green discharge cells, and red discharge cells. The method of claim 9, And the protrusion is made of the same material as the second partition wall. The method of claim 9, And the front discharge electrodes extend in one direction, and the rear discharge electrodes extend to cross the front discharge electrode. The method of claim 9, The front discharge electrodes and the rear discharge electrodes extend in one direction, And an address electrode extending to intersect the front discharge electrode and the rear discharge electrode. The method of claim 13, And the address electrode is disposed between the rear substrate and the phosphor layer, and a dielectric layer is disposed between the phosphor layer and the address electrode, and the protrusion is formed on the dielectric layer. The method of claim 14, And the protrusion is made of the same material as the dielectric layer. The method of claim 9, And the first partition wall and the second partition wall are integrally formed. The method of claim 9, Each of the front discharge electrodes and the rear discharge electrodes has a ladder shape, And at least a side surface of the first partition wall is covered by a protective film.