KR100570695B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel.

According to the present invention, a pair of discharge sustaining electrodes extend along a direction crossing the address electrode on the first substrate and are formed to correspond to each of the discharge cells in pairs, and each of the discharge cells is formed inside each discharge cell from the bus electrodes. It extends and includes a protruding electrode formed to face the pair. In addition, the pair of discharge sustaining electrodes may have a first gap G1 and a second gap G2 having different sizes between the protruding electrodes facing each other, and the second gap than the first gap G1. This is formed larger. Here, when half of the difference between the first interval G1 and the second interval G2 is a, a relationship of 2.8% ≦ a / G2 ≦ 16% is formed, and the scan electrode is formed in the address period. When the absolute value of the scan low voltage applied sequentially is referred to as Vscanl, it is preferably formed to have a relationship of 0.0138 μm / V ≦ a / Vscanl ≦ 0.173 μm / V.

Plasma, discharge sustain electrode, discharge gap, discharge voltage, scan low voltage

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

2 is a plan view illustrating a plasma display panel having a conventional protruding electrode and a matrix-type partition wall structure.

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

4 is a partial plan view of a plasma display panel according to an exemplary embodiment of the present invention.

5 is a driving waveform diagram of a plasma display panel according to an exemplary embodiment of the present invention.

6 is an enlarged plan view illustrating a unit discharge cell of a plasma display panel according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a surface discharge plasma display panel having an electrode structure in which one discharge sustaining electrode is disposed on one substrate so as to correspond to each discharge cell between the two substrates to cause display discharge.

In general, a plasma display panel (hereinafter referred to as a 'PDP') is a display device that realizes a predetermined image by exciting phosphors by ultraviolet rays generated by gas discharge. It is attracting attention as a device.

Referring to FIG. 1, in the conventional general PDP structure, an address electrode 112 is formed along one direction (the x-axis direction of the drawing) on the back substrate 110, and covers the address electrode 112 while covering the back substrate 110. The dielectric layer 113 is formed on the front surface. A stripe pattern partition wall 115 is formed on the dielectric layer 113 so as to be disposed between the address electrodes 112, and the red, green, and blue colors are formed between the partition walls 115. The phosphor layer 117 is formed.

In addition, a pair of transparent electrodes 102a and 103a and a bus electrode 102b are disposed on one surface of the front substrate 100 opposite to the rear substrate 110 in a direction crossing the address electrode 112 (y-axis direction in the drawing). Discharge sustaining electrodes 102 and 103 formed of 103b are formed, and the dielectric layer 106 and the MgO passivation layer 108 are formed on the entire front substrate 100 while covering the discharge sustaining electrodes.

The point where the address electrode 112 on the rear substrate 110 and the discharge sustaining electrodes 102 and 103 on the front substrate 100 cross each other constitutes a discharge cell.

The address discharge is performed by applying the address voltage Va between the address electrode 112 and the discharge sustain electrodes 102 and 103, and the sustain voltage Vs is applied between the pair of discharge sustain electrodes 102 and 103 again. Sustain discharge. The vacuum ultraviolet rays generated at this time excite the phosphor to emit visible light through the transparent front substrate 100 to implement the screen of the PDP.

However, in the PDP structure having the discharge sustaining electrodes 102 and 103 and the stripe-shaped partition wall 115 of the type shown in FIG. 1, crosstalk is also performed between neighboring discharge cells with the partition wall 115 interposed therebetween. In addition, since the discharge spaces are connected to each other along the direction in which the partition wall 115 is formed, there is a possibility that erroneous discharge occurs between neighboring discharge cells. In order to prevent this, the distance between the discharge sustaining electrodes 102 and 103 corresponding to adjacent pixels must be secured to a predetermined level or more, which hinders the improvement of efficiency.

In order to solve this problem, a PDP having an improved electrode and partition structure as shown in FIG. 2 has been proposed.

That is, the PDP structure shown in FIG. 2 has a shape in which the transparent electrodes 123a constituting the discharge sustaining electrode 123 protrude from the bus electrodes 123b so as to face each other for each discharge cell. It has a matrix-shaped partition wall 125 consisting of vertical partition walls 125a and horizontal partition walls 125b that are orthogonal to each other for the purpose of reducing crosstalk and increasing phosphor coating area. As a related art, there is a PDP disclosed in Japanese Patent Laid-Open No. 10-149771.

Even in a PDP having such a structure, plasma discharge starts from a space between a pair of discharge sustaining electrodes 123 facing each other in a sustaining period in which actual light emission occurs, diffuses toward an outer portion of a discharge cell, and then disappears. Therefore, the shape characteristics of the members constituting the discharge cell have a great influence on the sustain discharge. In particular, the partition wall 125 which determines the shape of the discharge cell and the shape of the discharge sustain electrode 123 causing the sustain discharge have a large influence on the sustain discharge. Affect

However, in the shape of the discharge sustaining electrode 123, a strong initial discharge is locally generated in the discharge gap. When the initial discharge is locally generated, the plasma discharge is not efficiently diffused in the discharge cell, and thus the discharge efficiency is lowered. There is this.

The technical problem to be achieved by the present invention is to solve the problems of the prior art described above by lowering the discharge voltage and improving the central local discharge through the effective arrangement and design of the electrode to allow the discharge to occur in a large area of the discharge cell It is to provide a plasma display panel that can maximize the efficiency.

According to an aspect of the present invention, a plasma display panel includes: a first substrate and a second substrate facing each other; Address electrodes formed on the second substrate; A partition wall disposed between the first substrate and the second substrate and partitioning a plurality of discharge cells; Phosphor layers formed in the respective discharge cells; And a bus electrode extending in a direction crossing the address electrode on the first substrate so as to correspond to each of the discharge cells in pairs, and extending from the bus electrode into each discharge cell, respectively, so that the pair face each other. And a pair of discharge sustaining electrodes corresponding to each of the discharge cells, each having a first gap G1 and a second gap having different sizes between the protruding electrodes facing each other. G2) is formed, and the second gap G2 is larger than the first gap G1.

When half of the difference between the first interval G1 and the second interval G2 is a,

2.8% ≤ a / G2 ≤ 16%

It is preferably formed to have a relationship of.

Each of the protruding electrodes is formed such that the width of the protruding electrode becomes narrower as the rear end portion of the protruding electrode moves away from the center of the discharge cell.

Here, when the absolute value of the scan low voltage applied sequentially to the scan electrode in the address period is called Vscanl,

0.0138 μm / V ≦ a / Vscanl ≦ 0.173 μm / V

It is preferable to be formed having a relationship of.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

A plasma display panel according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

3 is a partially exploded perspective view showing a plasma display panel according to an embodiment of the present invention, Figure 4 is a partial plan view showing a plasma display panel according to an embodiment of the present invention.

As shown, the plasma display panel according to the present embodiment (hereinafter referred to as 'PDP') basically has the first substrate 10 and the second substrate 20 disposed to face each other at a predetermined interval, and both substrates. A plurality of discharge cells 27R, 27G, and 27B are partitioned by partition walls in the spaces between the 10 and 20 so as to cause plasma discharge, and the discharge holding is maintained in the first and second substrates 10 and 20. The electrodes 12 and 13 and the address electrode 21 are disposed, respectively.

Specifically, first, a plurality of address electrodes 21 are formed along one direction (x-axis direction in the drawing) of the second substrate 20 on a surface facing the first substrate 10 of the second substrate 20. do. The address electrodes 21 are formed in a stripe shape and are formed in parallel with neighboring address electrodes 21 while maintaining a predetermined interval. A dielectric layer 23 is also formed on the second substrate 20 on which the address electrode 21 is formed. The dielectric layer 23 may be formed on the entire surface of the substrate while covering the address electrode 21. In the present embodiment, the stripe address electrode 21 is taken as an example, but the scope of the present invention is not limited thereto, and the shape of the address electrode to be applied may be variously changed.

A partition wall 25 is disposed in the space between the first substrate 10 and the second substrate 20 to partition the plurality of discharge cells 27R, 27G, 27B and the non-discharge region 26. The partition wall 25 is preferably formed on the upper surface of the dielectric 23 formed on the second substrate 20. Here, the discharge cells 27R, 27G, and 27B contain a discharge gas therein, and the discharge cells 27R, 27G, and 27B are spaces intended to cause gas discharge therein while an address voltage or a discharge sustain voltage is applied, and the non-discharge area 26 has a separate voltage therein. Is not applied, and is thus an area or space where discharge or light emission is not intended. This non-discharge region 26 is formed to have an area at least larger than the top width of each of the partition walls 25.

The non-discharge area 26 partitioned by the partition wall 25 is disposed in an area surrounded by the imaginary horizontal axis H and the vertical axis V passing through the center of each discharge cell 27R, 27G, 27B. In particular, on the line passing between the horizontal axis (H) and the vertical axis (V) passing through the center of each of the discharge cells (27R, 27G, 27B), respectively, it is preferable that the lines are arranged in the intersection portion. In other words, a common non-discharge region 26 is formed between two pairs of discharge cells horizontally and vertically adjacent to each other. In the present exemplary embodiment, the non-discharge regions 26 are formed to have independent cell structures by the partition walls 25.

On the other hand, the discharge cells 27R, 27G, and 27B are formed so as to share at least one partition wall with those neighboring in the direction of the discharge sustain electrodes 12 and 13, and in the direction of the address electrode 21 (x-axis in the figure). Direction, the width of both ends (discharge sustaining electrode direction, i.e., y-axis direction in the figure) becomes narrower as it moves away from the center of each discharge cell 27R, 27G, 27B. That is, referring to FIG. 1, the width Wc at the center of the discharge cells 27R, 27G, 27B is larger than the width We at the ends, and the width We at the ends is discharged. The further away from the center of the cells 27R, 27G, 27B, the narrower it becomes. In this embodiment, both ends of the discharge cells 27R, 27G, and 27B located in the direction of the address electrode 21 have a trapezoidal shape, and thus the overall planar shape of each discharge cell 27R, 27G, 27B is octagonal. Is achieved.

Phosphors of red (R), green (G), and blue (B) colors are applied to discharge cells 27R, 27G, and 27B, respectively, to form phosphor layers 29R, 29G, and 29B.

The discharge sustaining electrodes 12 and 13 formed on the first substrate 10 are formed in each of the discharge cells 27R, 27G, and 27B along the direction crossing the address electrode 21 (the y-axis direction in the drawing). Bus electrodes 12b and 13b arranged in pairs to correspond to each other and protruding electrodes extending from the bus electrodes 12b and 13b into the respective discharge cells 27R, 27G, and 27B, respectively, so that the pairs face each other. And 12a and 13a. The protruding electrodes 12a and 13a play a role of causing plasma discharge in the discharge cells 27R, 27G, and 27B. Preferably, the protruding electrodes 12a and 13a are made of indium tin oxide (ITO), which is a transparent electrode to secure luminance, but is not limited thereto. It may be made of an opaque electrode such as a metal electrode.

The pair of discharge sustaining electrodes 12 and 13 corresponding to each of the discharge cells 27R, 27G, and 27B may have a first gap G1 having different sizes between the protruding electrodes 12a and 13a facing each other. ) And a second gap G2, wherein the second gap G2 is larger than the first gap G1.

That is, as shown in FIG. 2, the protruding electrodes 12a and 13a have a concave portion formed at a central portion of the tip, and convex portions are formed at both sides of the concave portion, so that the pair of protruding electrodes 12a and 13a face each other. In the convex portion facing the first gap (G1) is formed a short gap (short gap) is formed, the concave portion is formed a second gap (G2) is a long gap (long gap). As the main discharge starts at the first first interval G1 and spreads out to the second interval G2, the discharge is spread to the entire discharge cells 27R, 27G, and 27B.

The first interval G1 of the protruding electrodes 12a and 13a may close the distances to the ends of the protruding electrodes 12a and 13a facing each other without significantly deteriorating the aperture ratio, thereby reducing the voltage required for discharge. There is an effect that can be lowered, the second interval (G2) serves to ensure a stable discharge by collecting the discharge in the center.

On the other hand, each of the protruding electrodes 12a and 13a has a rear end adjacent to the bus electrodes 12b and 13b toward the bus electrodes 12b and 13b as the distance from the center of the discharge cells 27R, 27G and 27B increases. The width in the y-axis direction in the figure is formed to be narrow. This part, in which the protruding electrodes 12a and 13a are connected to the bus electrodes 12b and 13b, also has a small contribution to discharge, and may be formed to have a narrower width than the end to improve discharge efficiency and to secure an aperture ratio. .

Recently, in order to improve the discharge efficiency, high partial pressure of Xen, ie, xenon, is increased. However, when the partial pressure of xenon Xe is increased to improve the discharge efficiency, a problem arises in that the discharge voltage rises. In order to reduce the discharge voltage, the discharge voltage can be lowered by reducing the gap between the discharge sustain electrodes, and in order to generate the address discharge in the address period better, the scan low voltage Vscal can be lowered than the address voltage Va. Do. However, when the gap between the discharge sustain electrodes is reduced in order to reduce the discharge voltage, a discharge occurs first between the scan electrode and the sustain electrode in the address discharge in the address period, so that an appropriate address discharge does not occur. Particularly, in the plasma display panel according to the embodiment of the present invention, long gaps and shop gaps are formed between the discharge sustaining electrodes. Although a low discharge voltage can be secured through the shop gaps, the gap between the discharge sustaining electrodes can be reduced as described above. In the address discharge, an error discharge may occur. Here, the scan electrode and the sustain electrode correspond to the above-mentioned discharge sustain electrode, and the scan electrode and the sustain electrode correspond to a pair of discharge sustain electrodes in one discharge cell.

Hereinafter, referring to FIG. 5, a problem in which an incorrect discharge occurs in an address period when the gap between the discharge sustain electrodes is reduced will be described.

5 is a driving waveform diagram of a plasma display panel according to an exemplary embodiment of the present invention. As shown in Fig. 5, the method of driving the plasma display panel includes a reset period, an address period, and a sustain period.

The reset period applies a ramp waveform that rises slowly to the Vset voltage and a ramp waveform that gradually falls to the Vnf voltage, thereby erasing the previous sustain discharge and stably performing the next address discharge. Setup Here, the voltage Ve is biased to the sustain electrode when a ramp waveform that gently descends to the scan electrode is applied.

Next, in the address period, the scan low voltage Vscanl is sequentially applied to the scan electrode, and at this time, the address voltage Va is applied to the address electrode corresponding to the cell to be turned on to generate an address discharge, thereby causing the cell to be selected. Pile up wall charges.

In the sustain period, the sustain discharge voltage Vs is alternately applied to the scan electrode and the sustain electrode to cause discharge in the cells addressed in the address period, thereby actually displaying an image.

On the other hand, in general, the address discharge in the address period is first generated between the scan electrode and the address electrode due to the application of the scan low voltage Vscanl applied to the scan electrode and the address voltage Va applied to the address electrode. At this time, a negative wall charge generated in the address discharge is attracted by biasing the voltage Ve to the sustain electrode, and the negative wall charge and the negative wall charge are respectively applied to the sustain electrode and the scan electrode of the discharge cell. Positive wall charges are formed. In this wall charge state, sustain discharge is performed due to the sustain discharge voltage Vs applied alternately in the sustain period. However, when the gap between the discharge sustaining electrodes (i.e., the scan electrodes and sustain electrodes) is reduced, the discharge voltage decreases, so that the address discharge between the scan electrodes and the address electrodes (i.e., between the sustain electrodes) before the address discharge. Discharge may occur. When discharge occurs first between the scan electrode and the sustain electrode, desired wall charges are not formed, and a problem arises in appropriately accumulating wall charges in a cell to be selected which serves as an address period.

Therefore, in order to eliminate the above-mentioned mis-discharge of the address discharge, the gap between the gap between the discharge sustain electrode (i.e. scan electrode and sustain electrode) (long gap G2 and short gap G1) and scan low voltage Vscanl. It is required to set the optimum design range.

Hereinafter, an optimal electrode design value and a setting range of the scan low voltage Vscanl will be described with reference to FIG. 6.

As shown in FIG. 6, the distances between the ends forming the first gap G1 and the ends forming the second gap G2 are respectively a and b up and down in each of the protruding electrodes 12a and 13a. define. In general, since a and b have the same distance, it is assumed to be the same below. In this case, a and b correspond to half of the difference between the first interval G1 and the second interval G2.

Table 1 shows the probability of false discharge while varying the first interval G1, the second interval G2, and the scan low voltage Vscanl, which are factors affecting the discharge characteristics, based on the 6-inch test panel. , Table 2 is shown. Here, the probability of false discharge is measured while the address voltage Va applied to the address electrode in the address period is 70V, the voltage Ve biasing the sustain electrode is 160V, and the scan low voltage Vscanl varies from 130V to 180V relative to ground. It was. In fact, since the scan low voltage is a negative value, the 130V to 180V means an absolute value. In Table 1, the units of G1, G2 and a (or b) are μm, and the scan low voltage Vscanl is V (voltage).

Referring to Table 1, the false discharge probability was observed to be almost zero at scan low voltages of 130 V to 180 V, 100 μm ≦ G2 ≦ 140 μm, and 2.5 μm ≦ a (or b) ≦ 22.5 μm. It can be seen that mis-discharge occurs in the section. That is, when the scan low voltage is between 130V and 180V, an appropriate shop gap distance G1 and a long gap distance G2 may be obtained through experiments.

At the point where the probability of false discharge is observed to be nearly zero, the ratio of a (or b) to G2 ((a or b) / G2) is 2.5% (2.5 / 100) ≤ a / G2 ≤ 16% (22.5 / 140). Range. In addition, the ratio of a (or b) to the scan low voltage (a / Vscanl) at the point where the false discharge probability is almost zero is 0.0138 μm / V (2.5 μm / 180 V) ≦ a / Vscanl ≦ 0.173 μm / V ( 22.5 µm / 130 V).

Referring to Table 2, the false discharge probability was observed to be almost zero at scan low voltages of 130 V to 180 V, 90 μm ≦ G2 ≦ 130 μm, and 2.5 μm ≦ a (or b) ≦ 22.5 μm. It can be seen that mis-discharge occurs in the section. That is, when the scan low voltage is between 130V and 180V, an appropriate shop gap distance G1 and a long gap distance G2 may be obtained through experiments. Here, the ratio of a (or b) to G2 ((a or b) / G2) at the point where the probability of false discharge is almost zero is 2.8% (2.5 / 90) ≤ a / G2 ≤ 17.3% (22.5 / 130 ) Range. In addition, the ratio (a / Vscanl) of a (or b) to the scan low voltage (a / Vscanl) at the point where the false discharge probability is almost 0 is 0.0138 µm / V (2.5 µm / 180V) ≤ a / Vscanl? 0.173 µm / V (22.5 µm / 130 V).

Here, the experimental results under the conditions of Table 1 shows that the relationship between a (or) b and the long gap distance G2 ranges from 2.5% (2.5 / 100) ≤ a / G2 ≤ 16% (22.5 / 140) The experimental results under the experimental conditions ranged from 2.8% (2.5 / 90) ≤ a / G2 ≤ 17.3% (22.5 / 130), so the common range between the two is 2.8% ≤ a / G2 ≤ 16%. In other words, through the experimental results of Table 1 and Table 2, the relationship between the optimum a (or) b and the long gap distance G2 becomes almost zero at 2.8% ≤a / G2≤16%.

On the other hand, in the experimental results of Table 1 and Table 2, the ratio (a / Vscanl) of a (or b) to the scan low voltage is equal to 0.0138 µm / V (2.5 µm / 180 V) ≤ a / Vscanl ≤ 0.173 µm / V In the range of (22.5㎛ / 130V), the probability of false discharge is almost zero.

Therefore, the optimum ratio of a (or) b to G2, which can be commonly derived from Tables 1 and 2, is in the range of 2.8% ≦ a / G2 ≦ 16%, and the ratio of a (or) b to scan low voltage. Is in the range of 0.0138 μm / V ≦ a / Vscanl ≦ 0.173 μm / V.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, the protruding electrodes of the pair of discharge sustaining electrodes corresponding to each discharge cell are formed to have different intervals G1 and G2 to improve the discharge efficiency, and scan the distance between G1 and G2 Designed to optimize in relation to voltage, it can prevent mis-discharge.

Claims (8)

A first substrate and a second substrate disposed to face each other; Address electrodes formed on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the respective discharge cells; And A bus electrode extending in a direction crossing the address electrode on the first substrate so as to correspond to each of the discharge cells, and a protrusion extending from the bus electrode into each of the discharge cells, respectively, so that the pair face each other; Discharge sustaining electrodes including an electrode Including, The pair of discharge sustaining electrodes corresponding to each of the discharge cells may have a first gap G1 and a second gap G2 having different sizes between the protruding electrodes facing each other, and the first gap G1. The second gap G2 is larger than When half of the difference between the first interval G1 and the second interval G2 is a, 2.8% ≤ a / G2 ≤ 16% The plasma display panel is formed to have a relationship of. The method of claim 1, And the pair of discharge sustain electrodes are a scan electrode and a sustain electrode. The method of claim 2, When the absolute value of the scan low voltage sequentially applied to the scan electrode in the address period is called Vscanl, 0.0138 μm / V ≦ a / Vscanl ≦ 0.173 μm / V Plasma display panel having a relationship of. The method of claim 1, Each of the protruding electrodes is narrower in width in the direction of the bus electrode as a rear end thereof adjacent to the bus electrode becomes farther from the center of the discharge cell.  The method according to claim 1 or 4, And the protruding electrode comprises a transparent electrode. A first substrate and a second substrate disposed to face each other; Address electrodes formed on the second substrate; A partition wall disposed between the first substrate and the second substrate to partition the plurality of discharge cells and the non-discharge area; Phosphor layers formed in the respective discharge cells; And A bus electrode extending in a direction crossing the address electrode on the first substrate, the pair of bus electrodes being formed to correspond to each of the discharge cells, and extending from the bus electrode into each of the discharge cells; Discharge sustaining electrodes including protruding electrodes Including, The non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, A pair of discharge sustaining electrodes corresponding to each of the discharge cells and a second gap G2 larger than the first gap G1 are formed between the protruding electrodes facing each other, When half of the difference between the first interval G1 and the second interval G2 is a, and the absolute value of the scan low voltage sequentially applied to the scan electrode in the address period is Vscanl, 0.0138 μm / V ≦ a / Vscanl ≦ 0.173 μm / V The plasma display panel is formed to have a relationship of. The method of claim 6, And the non-discharge regions are formed to have independent cell structures by the partition walls. The method of claim 6, And the discharge cells become narrower as the widths of both ends located in the direction of the address electrodes move away from the center of the discharge cells.

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