KR100581937B1 - Plasma display panel - Google Patents

Abstract

Disclosure of Invention The present invention aims to provide a plasma display panel in which the discharge space is increased, the light emission efficiency is increased, the discharge start voltage is reduced, and the luminance uniformity is improved in the discharge cell. The present invention provides a rear substrate, a front substrate disposed in parallel and spaced apart from the rear substrate, a partition wall disposed between the front substrate and the rear substrate, partitioning discharge cells, and extending across the discharge cells. And sustain electrode pairs each having an X electrode and a Y electrode, intermediate electrodes disposed between the pair of X and Y electrodes and extending in parallel to the X and Y electrodes, and the sustain electrode. A first dielectric layer formed to cover the pairs and the intermediate electrodes, wherein a groove is formed between the Y electrode and the intermediate electrode; Address electrodes extending across the discharge cells to intersect the pair and the intermediate electrode, a second dielectric layer formed to cover the address electrodes, a phosphor layer disposed in the discharge cells, and a discharge in the discharge cell. A plasma display panel having a gas is provided.

Description

Plasma display panel {Plasma display panel}

1 is a partially cutaway perspective view of a typical plasma display panel;

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

3 is a cross-sectional view taken along line III-III of FIG. 2, showing a state in which the upper plate is rotated 90 degrees,

4 is a cross-sectional view corresponding to FIG. 3 as a modification of the plasma display panel according to the first embodiment of the present invention;

5 is a partial perspective view illustrating another modified example of the upper plate illustrated in FIG. 2;

FIG. 6 is a block diagram illustrating a plasma display device including the plasma display panel of FIG. 2.

7 is a waveform diagram of signals applied to electrodes disposed in one discharge cell of the plasma display panel of FIG. 2 in a unit sub-field;

8 is a cross-sectional view illustrating an internal structure of a plasma display panel according to a second embodiment of the present invention, and shows a state in which a top plate is rotated 90 degrees.

FIG. 9 is a graph measuring luminance deviation according to depth of a groove of the front substrate illustrated in FIG. 8.

Explanation of symbols on the main parts of the drawings

100, 200: plasma display panel

111, 211: front substrate 113, 213: intermediate electrode

115, 215: first dielectric layer 116, 216: protective film

121, 221: back substrate 122, 222: address electrode

126, 226: phosphor 130, 230: partition wall

131, 231: X electrode 132, 232: Y electrode

145, 145 ', 145' ', 245: groove

H: depth of groove formed on the front substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which the luminous efficiency is increased and the discharge start voltage is reduced. The present invention also relates to a plasma display panel with improved luminance uniformity in a discharge cell.

Recently, a plasma display panel, which is drawing attention as a replacement of a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern by the ultraviolet rays is excited to obtain a desired image.

The general AC plasma display panel 10 includes an upper plate 50 for displaying an image to a user and a lower plate 60 coupled in parallel with each other, as shown in FIGS. 1 and 2. On the front substrate 11 of the upper plate 50, a pair of sustain electrodes 12, which are paired with the X electrode 31 and the Y electrode 32, is arranged, and the pair of sustain electrodes 12 of the front substrate 11 On the rear substrate 21 of the lower substrate 60 opposite to the disposed surface, the address electrodes 22 are disposed to intersect the electrodes 31 and 32 of the front substrate 11. Each of the first dielectric layer 15 and the second substrate is embedded in each of the front substrate 11 having the sustain electrode pairs 12 and the rear substrate 21 provided with the address electrodes 22. Dielectric layer 25 is formed. A protective film 16 made of MgO is generally formed on the rear surface of the first dielectric layer 15. The front surface of the second dielectric layer 25 maintains a discharge distance and prevents electro-optic crosstalk between discharge cells. The partition 30 is formed. Red, green, and blue phosphors 26 are coated on both sides of the partition wall 30 and on the entire surface of the second dielectric layer 25 on which the partition wall 30 is not formed. Each of the X electrode 31 and the Y electrode 32 includes transparent electrodes 31a and 32a and bus electrodes 31b and 32b. The space formed by the pair of X electrodes 31 and Y electrodes 32 arranged in this way and the address electrodes 22 intersecting the same form one discharge unit as the unit discharge cells 70.

In the plasma display panel 10 having such a shape, in order to increase the discharge area, the distance between the X electrode 31 and the Y electrode 32 must be arranged far. This is because when the distance between the X electrode 31 and the Y electrode 32 is far, the discharge space is increased and discharge is actively generated. However, when the distance between the X electrode 31 and the Y electrode 32 increases, there is a problem that power consumption increases because the discharge start voltage increases.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a plasma display panel in which a discharge space is enlarged to increase luminous efficiency and a discharge start voltage is reduced.

Another object of the present invention is to provide a plasma display panel having improved uniformity of luminance in discharge cells.

In order to achieve the above and other objects, the present invention provides a rear substrate, a front substrate disposed in parallel and spaced apart from the rear substrate, and disposed between the front substrate and the rear substrate and partitioning the discharge cells. Disposed between the barrier ribs, sustain electrode pairs extending across the discharge cells, each having an X electrode and a Y electrode, and disposed between the pair of X electrode and the Y electrode, and parallel to the X electrode and the Y electrode. A first dielectric layer formed to cover the intermediate electrodes, the sustain electrode pairs and the intermediate electrodes, and a groove formed between the Y electrode and the intermediate electrode; Address electrodes extending across the discharge cells to intersect the sustain electrode pair and the intermediate electrode, a second dielectric layer formed to cover the address electrodes, and disposed in the discharge cells; And a phosphor layer, there is provided a plasma display panel having a discharge gas in the discharge cells.

In the present invention, the groove is preferably formed such that the first dielectric layer penetrates. In this case, the groove may be extended to a predetermined depth of the front substrate portion through which the first dielectric layer penetrates.

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

(First embodiment)

2 and 3, there is shown an AC plasma display panel 100 according to a first embodiment of the present invention. 3 illustrates a state in which the upper plate 150 is rotated 90 degrees for convenience of description.

As shown, the plasma display panel 100 includes a top plate 150 and a bottom plate 160 coupled in parallel therewith, and are provided on the front substrate 111 and the bottom plate 160 provided on the top plate 150. The plurality of discharge cells 170 are partitioned by the partition wall 130 between the rear substrates 121. The partition wall serves to prevent optical crosstalk between the discharge cells 170. In the present embodiment, the partition wall 130 partitions the discharge cells 170 having rectangular cross sections. However, the barrier rib 130 may be a barrier rib of various patterns, for example, a closed barrier rib such as a waffle, a matrix, a delta, or the like, as long as a plurality of discharge spaces can be formed. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon such as a triangle, a square, a pentagon, or a circle, an ellipse, or the like.

A plurality of sustain electrode pairs 112 are disposed on the front substrate 111. In this case, the front substrate 111 is generally formed of a transparent material mainly made of glass.

The sustain electrode pair 112 refers to a pair of sustain electrodes 131 and 132 formed on the rear surface of the front substrate 111 to cause sustain discharge, and the sustain electrode pair 112 is formed on the front substrate 111. It is arranged in parallel at predetermined intervals. One sustaining electrode of the pair of sustaining electrodes 112 is the X electrode 131, and the other sustaining electrode is the Y electrode 132. In the present embodiment, the sustain electrode pairs 112 are disposed on the rear surface of the front substrate 111, but the arrangement position of the sustain electrode pairs is not limited thereto. For example, the sustain electrode pairs may be spaced apart from the rear surface of the front substrate at predetermined intervals. However, the sustain electrode pairs are preferably disposed at the same level from the front substrate.

Each of the X electrode 131 and the Y electrode 132 includes transparent electrodes 131a and 132a and bus electrodes 131b and 132b. The transparent electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor 126 from advancing to the front substrate 111. Such a material is indium tin (ITO). oxide). However, transparent conductors such as ITO generally have a high resistance, and thus, when the sustain electrode is formed only of the transparent electrodes, a large voltage drop in the longitudinal direction consumes a lot of driving power and slows the response speed. To this end, bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the transparent electrode. The bus electrode may be formed in a single layer structure using a metal such as Ag, Al, or Cu, but may be formed to have a multilayer structure such as Cr / Al / Cr. Such transparent electrodes and bus electrodes are formed using a photoetching method, a photolithography method, or the like.

The intermediate electrode 113 is disposed between the paired X electrode 131 and the Y electrode 132. The intermediate electrode 113 is formed on the rear surface of the first dielectric layer 114 and extends in one direction across the discharge cells 170 to be parallel to the X electrode 131 and the Y electrode 132. In addition, the intermediate electrode 113 is preferably spaced apart from the pair of X electrode 131 and the Y electrode 132 at substantially the same distance.

The intermediate electrode 113 also includes a transparent electrode 113a and a bus electrode 113b. The intermediate electrode 131 may be disposed at a different level from the X electrode 131 and the Y electrode 132, but the X electrode 131 and the Y electrode 132 may be disposed to perform the electrode forming process in the same process. It is preferable to be disposed at the same level from the front substrate 111.

The first dielectric layer 115 is formed on the front substrate 111 to fill the sustain electrode pairs 112 and the intermediate electrodes 113. The first dielectric layer 115 may be directly energized between adjacent sustain electrodes 131 and 132 and the intermediate electrode 113 during discharge, and positive or negative electrons may be applied to the sustain electrodes 131 and 132 and the intermediate electrode 113. While preventing direct damage by damaging the electrodes 131, 132, 113, it is formed of a dielectric that can induce charge and accumulate wall charges. Such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ . have.

A groove 145 is formed in the first dielectric layer 115 between the Y electrode 132 and the intermediate electrode 113. In the present embodiment, the groove 145 is formed to a predetermined depth of the first dielectric layer 115, but as shown in FIG. 4, the groove 145 ′ may be formed to penetrate the first dielectric layer 115 ′. have. In this case, the visible light transmittance to the front is improved due to the first dielectric layer 115 'removed by the groove 145'.

In addition, in the present embodiment, the groove 145 is formed to have a trapezoidal cross section, but is not limited thereto and may be formed to have various shapes. The groove 145 of the first dielectric layer may be formed by various methods. For example, after applying the first dielectric layer, sandblasting may be performed to form grooves. Alternatively, after the first dielectric layer is coated using a photosensitive dielectric, grooves may be formed by performing a photosensitive and developing process using a photomask.

Referring to FIG. 2, the groove 145 is formed to extend across the discharge cells 180 between the X electrode 131 and the Y electrode 132. In this case, the groove 145 may provide an exhaust path of the impure gas filled in the discharge space during the exhaust process, and provide an inflow path of the discharge gas during the encapsulation process. However, as shown in FIG. 5, the groove 145 ″ formed in the first dielectric layer 115 ″ may be discontinuously formed based on the discharge cell 170. However, the shape of the groove is not limited to the above.

The groove 145 reduces the discharge path between the Y electrode 132 and the intermediate electrode 113, and the electric field is strongly generated in this portion, thereby increasing the electron and ion density. Thus, a strong plasma discharge occurs in the groove 145. In particular, as the depth H of the groove increases, the discharge between the X electrode and the Y electrode becomes closer to the structure of the counter discharge, thereby having the advantage of the counter discharge.

The protective layer 116 is formed to cover the first dielectric layer 115. The protective layer 116 prevents cations and electrons from colliding with the first dielectric layer 115 during the discharge and damaging the first dielectric layer 115. In addition, the protective layer 116 emits a large amount of secondary electrons during discharge, thereby smoothing plasma discharge. The protective layer 116 performing this function is formed using a material having a high secondary electron emission coefficient and a high visible light transmittance.

As the protective layer 116, a material including MgO is formed on the first dielectric layer as a thin film. The protective layer 116 is mainly formed by sputtering or electron beam deposition after other processes of the upper plate 150 are completed.

On the front surface of the back substrate 121, address electrodes 122 intersecting with the X electrode 131, the Y electrode 132, and the intermediate electrode 113 are disposed in the unit discharge cell 170. The address electrodes 122 are intended to cause an address discharge to facilitate sustain-discharge between the X electrode 131 and the Y electrode 132, and more specifically, serve to lower a voltage for sustain-discharge. . In the above, the address discharge is a discharge occurring between the intermediate electrode 132 and the address electrode 122.

The space formed by the pair of X electrodes 131, Y electrodes 132, and the intermediate electrodes 113 and the address electrodes 122 intersecting the same is formed as a unit discharge cell 170 as one discharge unit. Done.

The second dielectric layer 125 is formed on the rear substrate 121 to fill the address electrode 122. The second dielectric layer 125 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrode 122 during discharge and damaging the address electrode 122. Such dielectrics include PbO and B ₂ O ₃ , SiO ₂ and the like.

Red light emission, green light emission, and blue light emission phosphor layers 126 are formed on the entire surface of the second dielectric layer 125 between the partition walls 130 partitioning the discharge cells 170. In addition, red, green, and blue light emitting phosphor layers 126 corresponding to the respective discharge cells are formed on the side surfaces of the partition wall 130.

The phosphor layer 126 has a component that generates ultraviolet light by receiving ultraviolet rays. The red phosphor layer formed in the red discharge cell includes a phosphor such as Y (V, P) O ₄ : Eu, and the green discharge cell. The red light emitting phosphor layer formed on the substrate includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layer formed on the blue discharge cell includes a phosphor such as BAM: Eu.

In addition, the discharge cells 170 are filled with a discharge gas in which neon (Ne), xenon (Xe), etc. are mixed, and in the state where the discharge gas is filled as described above, the front and rear substrates 111 and 121 The front substrate and the back substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edge thereof.

As shown in FIG. 6, the plasma display apparatus 200 including the plasma display panel 100 according to an exemplary embodiment of the present invention includes the above-described plasma display panel 100, an image processor 256, and a logic controller ( 262, an address driver 223, an X driver 224, a Y driver 225, and an M driver 226. In FIG. 6, X electrodes 131, Y electrodes 132, and intermediate electrodes 113 forming a plurality of lines are illustrated.

Referring to the drawings, the Y electrodes 132 are spaced apart from each other to one side of the front substrate 111, and are connected to each other at the edge portion. When the plasma display panel 100 is driven, since the same electrical signal is applied to the Y electrodes 132, the Y electrodes 132 are electrically connected in common. Similarly to the Y electrodes 132, the X electrodes 131 are electrically connected in common because common signals are applied. However, since independent signals are applied to the intermediate electrodes 113, the intermediate electrodes 113 extend apart from each other and are connected to the intermediate electrode driver 226.

In the unit discharge cell 170, the positions and shapes of the electrodes 113, 122, 131, and 132 are substantially positioned in the intermediate electrode 113, the address electrode 122, and the X of FIGS. 2 and 3. It is the same as the electrode 131 and the Y electrode 132.

The image processing unit 256 converts an external analog image signal into a digital signal to convert an internal image signal, for example, 8 bits of red (R), green (G), and blue (B) image data, a clock signal, vertical and horizontal, respectively. Generate sync signals. The logic controller 262 controls the driving control signals S _A , S _X , and _A according to an internal image signal from the image processor 256. S _Y , S _M ) is generated.

6 and 7, reference numeral S _A denotes a drive signal applied to the address electrode 122, S _X denotes a drive signal applied to the X electrode 131, and S _Y denotes a drive applied to the Y electrode 132. S _M indicates a drive signal applied to the intermediate electrode 113.

The address driver 223 may include driving control signals S _A , S _X , and _A from the logic controller 262. S _Y , The address driving signal S _A is processed in S _M to generate display data signals, and the generated display data signals are applied to the address electrodes 122. The X driver 224 may drive driving signals S _A , S _X , from the logic controller 262. S _Y , S _M) processes the X driving control signal _(X S) to be applied from the X electrode 131. In addition, the Y driver 225 may drive driving signals S _A , S _X , from the logic controller 262. S _Y , The S _M driving control signal S _Y is processed and applied to the Y electrodes 132, and the M driving unit 226 receives the driving control signals S _A , S _X , and S from the logic controller 262. S _Y , S _M) from among processes the M drive control signal (S _M) is applied to the intermediate electrode 113.

FIG. 7 is a waveform diagram of signals applied to electrodes 113, 122, 131, and 132 disposed in one discharge cells 170 of the plasma display panel 100 in a unit sub-field SF. Each of all unit frames is divided into eight subfields to realize time division gray scale display. In addition, each subfield SF is divided into a reset time R, an addressing time A, and a sustain-discharge time S. FIG.

Referring to FIG. 7, during the reset time R of the unit subfield SF, a discharge is generated while the rising lamp is applied to the intermediate electrode 113, and then an erasing discharge is generated while the falling lamp is applied. Reset discharge occurs in the entire panel 100, and the wall charge state of the entire discharge cells 170 is uniform. In detail, the ground voltage, which is the first voltage V _G , is applied to the address electrode 122 and the Y electrode 132. The voltage applied to the intermediate electrode 113 first rises to the second voltage V _SET + V _S and then decreases to the first voltage V _G. At this time, the first voltage V _G is first applied to the X electrode 131, and while the intermediate electrode 113 is reduced from the second voltage V _SET + V _S to the first voltage V _G , the first voltage V _G is applied. A sustain voltage of 3 voltages V _S is applied.

At each addressing time A, an intermediate electrode biased with the scan voltage V _SCAN lower than the third voltage V _S while the display data pulses of the address voltage V _A are applied to the address electrode 122. The scan pulse of the first voltage V _G is applied to 113. Accordingly, when high-level display data pulses are applied while the scan pulse is applied, wall charges are formed by the address discharge. Therefore, as a result of the address discharge, wall charges are accumulated on the X electrode 131, the intermediate electrode 113, and the Y electrode 132. However, since the display data pulse is not applied to the discharge cells for which address discharge is unnecessary, wall charges are not formed in the discharge cells.

At each sustain-discharge time S, sustain-discharge pulses are alternately applied to all the X electrodes 131 and the Y electrodes 132, so that sustain discharges are generated when wall charges are formed at the corresponding addressing time A. FIG. Cause In this case, the intermediate electrode 131 and the address electrode 122 are biased to the third voltage V _S and the first voltage V _G , respectively.

However, when the sustain-discharge is started, the first voltage V _G is applied to the X electrode 131 in which the negative wall charges are accumulated, and the third voltage in the intermediate electrode 113 in which the positive wall charges are accumulated. Since V _S ) is applied, the discharge starts between the X electrode 131 and the intermediate electrode 113 which are relatively close in distance. Therefore, since the discharge starts between the electrodes 113 and 131 disposed at a close distance, the discharge start voltage is reduced. After the discharge occurs between the X electrode 131 and the intermediate electrode 113, the discharge region is extended to the Y electrode 132, so that sustaining-discharge is actively performed between the X electrode 131 and the Y electrode 132. Occurs. At this time, while the first voltage V _G and the third voltage Vs are applied to the Y electrode 132 and the X electrode 131 alternately, a sustain discharge that displays a predetermined gray level during the sustain period is continuously generated to generate an image. Will be implemented. In particular, since the pressure is started between the X electrode 131 and the intermediate electrode 113, the distance between the X electrode 131 and the Y electrode 132 can be arranged far. In this case, since the discharge space has the effect of increasing, the discharge is actively generated, and ultimately the luminous efficiency is increased. As a result, due to the sustain-discharge between the X electrode 131, the intermediate electrode 113, and the Y electrode 132, the discharge start voltage is reduced and the light emission efficiency is increased. Ultraviolet rays are emitted while the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 126 coated in the discharge cell 170. The energy level of the excited phosphor layer 126 is lowered, and visible light is emitted. The light is transmitted through the front substrate 111 to form an image that a user can recognize.

The luminance of the plasma display panel 100 is proportional to the length of the sustain-discharge time S occupied in the unit frame SF. The length of the sustain-discharge time S occupied in the unit frame is 255T (T is the unit time). In this case, each unit frame is divided into eight sub-fields SF ₁ , SF ₂ , SF ₃ , SF ₄ , SF ₅ , SF ₆ , SF ₇ , and SF ₈ to realize time division gray scale display. do. Here, the first maintenance of the sub-fields (SF ₁₎ - the discharge time, the time (1T) corresponding to ^20, the second holding of the sub-field (SF ₂₎ - Time to discharge time corresponding to the 2 ¹ (2T) The time 4T corresponding to 2 ² in the sustain-discharge time of the third subfield SF ₃ , and the time 8T corresponding to 2 ³ in the sustain-discharge time of the fourth subfield SF ₄ . In the sustain-discharge time of the fifth subfield SF ₅ , a time 16T corresponding to 2 ⁴ and a sustained-discharge time of the sixth subfield SF ₆ , 32T correspond to 2 ⁵ . This time 64T corresponds to 2 ⁶ in the sustain-discharge time of the seventh subfield SF ₇ , and the time 128T corresponds to 2 ⁷ in the sustain-discharge time of the eighth subfield SF ₈ . Are set respectively. Accordingly, if the subfield to be displayed among the eight subfields is appropriately selected, the display of 256 gray levels can be performed including all zero (zero) gray levels that are not displayed in any of the subfields.

As described above, at the sustain-discharge time S of the plasma display panel 100, discharge starts between the X electrode and the intermediate electrode, and the discharge discharge is spread between the X electrode and the Y electrode. However, when no groove is formed between the Y electrode and the intermediate electrode, the discharge generated between the X electrode and the intermediate electrode is generated even after the discharge is spread due to the influence of the start discharge between the X electrode and the intermediate electrode. It is more actively generated than the discharge generated between the electrodes. This variation in discharge causes a nonuniformity in luminance in the discharge cell, which causes a problem in that the luminance between the X electrode and the intermediate electrode is about 0.3 dB / m 2 higher than the luminance between the Y electrode and the intermediate electrode. However, in the present invention, since the electric field is concentrated by the groove formed between the Y electrode and the intermediate electrode, the discharge amount in this portion can be made substantially equal to the discharge amount generated between the X electrode and the intermediate electrode. In addition, since a part of the first dielectric layer is removed by the groove, the visible light transmittance is improved, and the brightness is also increased. Therefore, since discharge is generated uniformly throughout the discharge cell, there is no variation in luminance due to a change in position in the discharge cell.

Second Embodiment

8 is a vertical cross-sectional view showing the internal structure of the plasma display panel 200 according to the second embodiment of the present invention. Referring to the drawings, the plasma display panel 200 includes a top plate 250 and a bottom plate 260. In FIG. 8, the top plate 250 is rotated 90 degrees for convenience. Here, description will be made mainly on matters different from those of the first embodiment.

The present embodiment differs from the first embodiment in that the groove 245 formed between the Y electrode 232 and the intermediate electrode 213 passes through the first dielectric layer 215 and has a predetermined depth of the front substrate 211. (H) is formed. Since the groove 245 is not formed deeper than in the first embodiment, the visible light transmittance between the Y electrode 232 and the intermediate electrode 213 is further improved. In addition, as the area of the groove 245 increases, the area where the electric field is concentrated increases, and discharge is actively generated, so that the luminance is improved in the portion.

The material characteristics of the first dielectric layer 215 and the shape of the groove 245 are the same as or similar to those of the first embodiment described above, and thus, reference may be made thereto. In addition, the sustain electrode pair 212 including the X electrode 231 and the Y electrode 232 having the transparent electrodes 231a and 232a and the bus electrodes 231b and 232b, respectively, the front substrate 211 and the protective film ( 216, the discharge cell 270, the partition wall 230, the phosphor layer 226, the second dielectric layer 225, the address electrode 222, and the back substrate 221, the structure and operation of the first embodiment described above. It is the same or similar to the corresponding component.

The operation of the plasma display panel 200 according to the second embodiment having the above structure is the same as that of the first embodiment, and thus a detailed description thereof will be omitted.

9 is a graph illustrating luminance deviation in one discharge cell 270 of the plasma display panel 200 according to the second embodiment. Herein, the width D of the groove was set to 75 µm, and the depth H of the groove formed on the front substrate 211 was measured to vary from 2.5 µm to 15 µm. The measurement was carried out using the optical equipment of Photo Research's PR900. The luminance deviation is defined as the luminance difference of the portion between the Y electrode 232 and the intermediate electrode 213 in the luminance of the portion between the X electrode 231 and the intermediate electrode 213. Referring to FIG. 9, when the depth H of the groove formed on the front substrate 211 is 5 μm to 15 μm, it may be confirmed that no luminance deviation occurs. Therefore, the depth H of the groove formed on the front substrate 211 is preferably 5 μm to 15 μm.

The plasma display panel according to the present invention has the following effects.

First, since the discharge is initiated between the intermediate electrode disposed between the X electrode and the Y electrode and the X electrode, the discharge start voltage is reduced. In addition, since the distance between the X electrode and the Y electrode can be arranged far, the discharge space is increased, the discharge occurs smoothly. Therefore, luminous efficiency is improved.

Second, the luminance in the discharge cell is made uniform by the groove formed between the Y electrode and the intermediate electrode.

Third, since part of the first dielectric layer and / or the front substrate is removed by the groove, the visible light transmittance is improved.

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 (10)

Back substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; Sustain electrode pairs extending across the discharge cells and having X and Y electrodes, respectively; Intermediate electrodes disposed between the paired X and Y electrodes and extending in parallel with the X and Y electrodes; A first dielectric layer formed to cover the sustain electrode pairs and the intermediate electrodes, wherein a groove is formed between the Y electrode and the intermediate electrode; Address electrodes extending across the discharge cells to intersect the sustain electrode pair and the intermediate electrode in the discharge cell; A second dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And And a discharge gas in the discharge cell. The method of claim 1, And the groove is formed such that the first dielectric layer penetrates the plasma display panel. The method of claim 2, And the groove is extended to a predetermined depth of the front substrate portion through which the first dielectric layer penetrates. The method of claim 3, The depth of the groove formed on the front substrate is a plasma display panel, characterized in that 5㎛ to 15㎛. The method of claim 1, And the sustain electrode pairs and the intermediate electrodes are disposed at the same level from the front substrate. The method of claim 5, And the sustain electrode pairs and the intermediate electrodes are disposed on a rear surface of the front substrate. The method of claim 1, And a protective layer covering the first dielectric layer. The method of claim 1, The groove is plasma display panel, characterized in that formed discontinuously for each discharge cell. The method of claim 1, And the groove is formed across the discharge cells. The method of claim 1, And the intermediate electrode is disposed spaced at substantially the same distance from the paired X and Y electrodes.

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