KR20080094277A - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to enhance discharge distribution efficiency by connecting first and second electrode lines through bridge electrodes. A plasma display apparatus includes a substrate and sustain electrodes(202,203), which are formed in pairs on the substrate. The sustain electrodes include at least two electrode lines(202a,202b,203a,203b) and bridge electrodes(202c,203c). The electrode lines are crossed over a discharge cell. The bridge electrodes connect at least two electrode lines. The closest electrode line to a center of the discharge cell among the electrode lines is bended over toward a center of the discharge cell. A distance between opposing electrode lines at the center of the discharge cell is 50mum through 120mum.

Description

Plasma display apparatus

1 and 2 are perspective views showing an embodiment of the structure of a plasma display panel according to the present invention.

FIG. 3 is a timing diagram illustrating an embodiment of a method of time-divisionally driving a plasma display panel by dividing one frame into a plurality of subfields.

4 is a timing diagram illustrating an embodiment of driving signals for driving a plasma display panel.

5 is a view showing a first embodiment of the electrode arrangement of the plasma display panel according to the present invention;

6, 7, and 8 illustrate a second embodiment of the electrode arrangement of the plasma display panel according to the present invention.

9 is a view showing a third embodiment of the electrode arrangement of the plasma display panel according to the present invention.

10 is a sectional view showing a first embodiment of a sustain electrode structure;

11 is a view showing a second embodiment of a sustain electrode structure;

12 is a view showing a third embodiment of the sustain electrode structure;

13 is a view showing a fourth embodiment of the sustain electrode structure;

14 is a view showing a fifth embodiment of the sustain electrode structure;

Fig. 15 is a diagram showing the sixth embodiment of the sustain electrode structure.

The present invention relates to a plasma display device, and more particularly, to a structure of an electrode formed in a discharge cell.

Recently, various flat panel displays manufactured by reducing the weight and volume, which are disadvantages of cathode ray tubes, have been developed. Examples of the flat panel display include a liquid crystal display (LCD) and a field emission display ( Field Emission Display (FED), Plasma Display Panel (hereinafter referred to as "PDP device") and Electro-Luminescence (EL) display.

Among them, PDP is a flat panel display device that displays images using plasma discharge. The PDP is used for high resolution televisions, monitors, and indoor / outdoor advertising displays because it has a fast response speed and is suitable for displaying large area images.

At least one electrode is formed on the upper substrate or the lower substrate constituting the panel, and the plasma discharge is generated in the discharge cell as a voltage is applied to the electrode.

In particular, a scan electrode and a sustain electrode are paired on the upper substrate to form a plurality of sustain electrode pairs, and an address electrode is formed on the lower substrate in a direction crossing the plurality of sustain electrode pairs.

At this time, according to the structure of the plurality of sustain electrode pairs formed on the upper substrate, such factors as light transmittance toward the front of the panel, discharge start voltage, discharge diffusion efficiency, etc. are different.

An object of the present invention is to provide a structure of a panel electrode that can increase the mass productivity of the plasma display device.

In addition, to provide a plasma display device having an electrode structure of the present invention that can reduce the cost by removing the transparent electrode made of ITO.

In addition, the structure of the panel electrode of the present invention to provide a plasma display device that the aperture ratio is improved as the bridge electrode is shifted.

According to an aspect of the present invention, there is provided a plasma display apparatus including a substrate, sustain electrodes formed in pairs on the substrate, the sustain electrodes comprising at least two electrode lines crossing a discharge cell; And a bridge electrode connecting the at least two electrode lines, wherein an electrode line closest to the center of the discharge cell among the at least two electrode lines is bent in a center direction of the discharge cell.

Each electrode line facing each other at the center of the discharge cell is formed to form the shortest distance from the center of the electrode line, the distance between the electrode lines facing each other is 50um or more and 120um or less.

Among the at least two electrode lines, the electrode line furthest from the center of the discharge cell is bent in a direction opposite to the center of the discharge cell.

At this time, the bent portion of the electrode line furthest from the center of the discharge cell among the at least two electrode lines is formed more smoothly than the bent portion of the electrode line closest to the center of the discharge cell.

At least one protruding portion protruding in a direction opposite to the center of the discharge cell is formed in the electrode line furthest from the center of the discharge cell among the at least two electrode lines, which is preferably formed in the center of the electrode line.

In addition, the protrusion may be formed in line with the bridge electrode.

The protruding portion is preferably formed to have a length of 30 μm or more and 80 μm or less, and is formed to be in contact with a partition wall partitioning a discharge cell or spaced apart by a distance of 50 μm or less.

The bridge electrode may be formed to overlap with the address electrode, or may be formed to be deflected outward from the center line of the discharge cell so as not to overlap with the address electrode. In this case, the bridge electrode is formed spaced apart from the partition wall partitioning the discharge cell by 20um or more and 70um or less.

The width of the electrode line furthest from the center of the discharge cell among the at least two electrode lines is 40 um or more and 50 um or less, and the width of the electrode line nearest to the center of the discharge cell is 30 um or more and 40 um or less. In addition, the width of the bridge electrode is formed to be 30um or more and 50um or less.

The shortest distance between the electrode line furthest from the center of the discharge cell and the closest electrode line among the at least two electrode lines is preferably 50 μm or more and 180 μm or less.

The length of the bridge electrode connecting the at least two electrode lines is 120 um or more and 230 um or less, and the electrode line furthest from the center of the discharge cell is spaced apart from the partition wall partitioning the discharge cell by 30 um or more and 80 um or less. Is formed.

Hereinafter, a plasma display device according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 illustrate a perspective view of an embodiment of a structure of a plasma display panel according to the present invention.

1 and 2, the plasma display panel includes an upper panel 200 and a lower panel 210 that are bonded at predetermined intervals. An address electrode 213 formed on the lower substrate 211 in a direction crossing the sustain electrode pairs 202 and 203, and a partition 212 formed on the lower substrate 211 and partitioning a plurality of discharge cells. do.

The upper panel 200 includes a pair of sustain electrodes 202 and 203 formed in pairs on the upper substrate 201. The sustain electrode pairs 202 and 203 are divided into the scan electrode 202 and the sustain electrode 203 according to the applied voltage. The sustain electrode pairs 202 and 203 are covered by an upper dielectric layer 204 which limits the discharge current and insulates the electrode pairs, and a protective film layer 205 is formed on the upper dielectric layer 204, so that during gas discharge. The upper dielectric layer 204 is protected from sputtering of charged particles generated, and the emission efficiency of secondary electrons is increased.

The lower panel 210 has a plurality of discharge spaces, that is, partitions 212 partitioning the discharge cells are formed on the lower substrate 211. In addition, the address electrode 213 is disposed in a direction crossing the sustain electrode pairs 202 and 203, and the visible surface of the lower dielectric layer 215 and the partition wall 212 is emitted by ultraviolet rays generated during gas discharge. Phosphor 214 is applied.

In this case, the barrier rib 212 is composed of a vertical barrier rib formed in a direction parallel to the address electrode 213 and a horizontal barrier rib formed in a direction crossing the address electrode 213, and physically distinguishes discharge cells and is generated by discharge. UV light and visible light are prevented from leaking to adjacent discharge cells.

The sustain electrode pairs 202 and 203 shown in FIG. 1 are composed of transparent ITO electrodes 207 and 208 and metal bus electrodes 202 and 203 such as silver (Ag), copper (Cu) or chromium (Cr). That is, the sustain electrode pair is formed by stacking two layers.

In addition, the sustain electrode pairs 202 and 203 shown in FIG. 2 do not use transparent ITO electrodes, and the metal bus electrodes 202 and 203 are formed in a single layer. The metal bus electrode includes a metal such as silver (Ag), copper (Cu), or chromium (Cr).

For example, the metal bus electrode according to the present embodiment is preferably formed of silver, and silver (Ag) preferably has photosensitive properties. In addition, each of the sustain electrode pairs 202 and 203 according to the embodiment of the present invention has a darker color and lower light transmittance than the upper dielectric layer 204 or the lower dielectric layer 214 formed on the upper substrate 201. It is desirable to have a property.

In the discharge cell, the phosphor layers 214 of R (Red), G (Green), and B (Blue) may each have a symmetrical structure having the same pitch or asymmetrical structures having different pitches. When the discharge cell has an asymmetric structure, the width of the (Red) cell <the width of the G (Green) cell <the width of the B (Blue) cell can be adjusted according to the color temperature of each phosphor layer.

As described above, the sustain electrodes 202 and 203 formed of a double layer or a single layer are preferably formed of a plurality of electrode lines.

1 and 2, the sustain electrode pair of the present invention includes a scan electrode and a sustain electrode, and the scan electrode 202 includes at least two electrode lines 202a and 202b. Similarly, the sustain electrode 203 disposed to face the center of the scan electrode and the discharge cell is also formed to include at least two electrode lines 203a and 203b.

The reason why each electrode constituting the sustain electrode pairs 202 and 203 is formed of at least two electrode lines is to increase the aperture ratio and the discharge diffusion efficiency. That is, each electrode is configured to include at least two electrode lines in order to closely arrange the sustain electrode pairs that form a voltage difference to cause a discharge, and maintain the aperture ratio by forming each electrode line in a fine width.

In this case, the number of electrode lines is preferably determined in consideration of the aperture ratio and the discharge efficiency at the same time, the case of the electrode consisting of a metal bus layer as shown in FIG. 2 than the embodiment of the electrode consisting of a transparent electrode layer and a metal bus layer as shown in FIG. Since the aperture ratio is high, the number of electrode lines and electrode line widths that can be applied in both embodiments can be changed by the designer.

In addition, the structure shown in Figures 1 and 2 is only an embodiment of the structure of the plasma panel according to the present invention, the panel structure of the present invention is not limited thereto. For example, a black matrix (BM) that absorbs external light generated from the outside to reduce reflection and improves the purity and contrast of the upper substrate 201 includes a black matrix (BM). 201), the black matrix can be both a separate and integral BM structure.

Here, the separate BM has a structure in which a black layer and a black matrix formed between the sustain electrodes 202 and 203 and the upper substrate 201 are not connected, and the integrated BM is integral with the layer and the black matrix connected. It means the structure that makes up. In addition, when the separate BM is formed, the black matrix and the layer may be formed of different materials, and when the integral BM is formed, the black matrix and the layer may be formed of the same material.

In addition, although the barrier rib structure of the panel illustrated in FIGS. 1 and 2 shows a close type in which the discharge cells have a closed structure by the vertical barrier and the horizontal barrier, a stripe type including only three barrier ribs is used. Alternatively, a structure such as a fish bone in which protrusions are formed at predetermined intervals on the vertical bulkhead may be used.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIGS. 1 and 2, but also the structure of the partition wall having various shapes may be possible. For example, a channel type in which a channel usable as an exhaust passage is formed in at least one of a differential partition structure, a vertical partition 21a, or a horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. The barrier rib structure having a groove formed in at least one of the barrier rib structure, the vertical barrier rib 21a or the horizontal barrier rib 21b may be possible. Here, in the case of the differential barrier rib structure, the height of the horizontal barrier rib 21b is more preferable, and in the case of the channel barrier rib structure or the groove barrier rib structure, it is preferable that the channel is formed in the horizontal barrier rib 21b or the groove is formed. something to do.

Meanwhile, in one embodiment of the present invention, although each of the R, G, and B discharge cells is shown to be arranged on the same line, it may be arranged in a different shape. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal as well as rectangular.

FIG. 3 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields in the plasma display panel according to the present invention having the structure as described above. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8, and a sustain section S1, ..., S8. . Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, a display data signal is applied to the address electrode X, and scan pulses corresponding to each scan electrode Y are sequentially applied. In another embodiment according to the present invention, the address electrode X is driven by being separated into two or more, so that the scan pulse may be simultaneously applied to the two or more scan electrodes (Y).

In each of the sustain periods S1, ..., S8, a sustain pulse is alternately applied to the scan electrode Y and the sustain electrode Z to form wall charges in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gradations, each subfield in turn has different sustains at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of pulses can be assigned. In order to obtain luminance of 133 gradations, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields or the like, such as 12 or 16 subfields.

The number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

4 is a timing diagram illustrating an embodiment of driving signals for driving the plasma display panel with respect to the divided subfield.

First, there is a pre-reset section for forming the positive wall charges on the scan electrodes (Y) and the negative wall charges on the sustain electrodes (Z). A reset section for initializing the discharge cells of the entire screen by using the wall charge distribution formed by the pre-reset section, an address section for selecting the discharge cells, and a sustain for maintaining the discharge of the selected discharge cells ( Includes sustain range.

The reset section includes a setup section and a setdown section. In the setup section, rising ramp waveforms (Ramp-up) are simultaneously applied to all scan electrodes to generate fine discharges in all discharge cells. Thus, wall charges are generated. In the set-down period, a falling ramp waveform (Ramp-down) falling at a positive voltage lower than the peak voltage of the rising ramp waveform (Ramp-up) is simultaneously applied to all the scan electrodes (Y), thereby eliminating discharge discharge in all the discharge cells. Generated, thereby eliminating unnecessary charges during wall charges and space charges generated by the setup discharges.

In the address period, a negative scan signal scan is sequentially applied to the scan electrode, and at the same time, a positive data signal data is applied to the address electrode X. The address discharge is generated by the voltage difference between the scan signal and the data signal and the wall voltage generated during the reset period, thereby selecting the cell. On the other hand, a signal for maintaining a sustain voltage Vs is applied to the sustain electrode during the set down period and the address period.

In the sustain period, a sustain pulse is alternately applied to the scan electrode and the sustain electrode to generate sustain discharge in the form of surface discharge between the scan electrode and the sustain electrode.

The driving waveforms shown in FIG. 4 are exemplary embodiments of signals for driving the plasma display panel according to the present invention, and the present invention is not limited to the waveforms shown in FIG. 4. For example, the pre-reset period may be omitted, the polarity and the voltage level of the driving signals may be changed as necessary, and an erase signal for erasing wall charge may be applied to the sustain electrode after the sustain discharge is completed. In addition, the single sustain driving may be performed by applying the sustain signal to only one of the scan electrode (Y) and the sustain (Z) electrode to generate a sustain discharge.

FIG. 5 illustrates a first embodiment of an electrode arrangement of a plasma display panel according to the present invention. It is preferable that a plurality of discharge cells constituting the plasma display panel are arranged in a matrix form within the effective area 300. The discharge cells are provided at the intersections of the scan electrodes Y ₁ to Y _m , the sustain electrodes Z ₁ to Z _m , and the address electrodes X ₁ to X _n . The scan electrodes Y ₁ to Y _m are sequentially driven, and the sustain electrodes Z ₁ to Z _m are commonly driven. As driving signals are applied to the scan electrodes Y ₁ to Y _m , the sustain electrodes Z ₁ to Z _m , and the address electrodes X ₁ to X _{n in the} effective region 300, discharge occurs in the discharge cells. The display image is displayed. The electrodes may be disposed in the non-effective area outside the effective area 300, but the electrodes disposed outside the effective area 300 are dummy electrodes that do not affect the display image.

As shown in FIG. 5, the address electrodes X ₁ to X _n are preferably driven to be divided into odd-numbered lines and even-numbered lines.

As illustrated in FIG. 5, scan electrodes Y ₁ and Y _m are arranged in upper and lower outermost portions of the effective area 300 of the plasma display panel according to the present invention. The scan electrodes and the sustain electrodes are alternately arranged. According to the present invention, in order for the scan electrodes Y ₁ and Y _m to be arranged at the outermost side, two sustain electrodes must be continuously arranged in at least one portion. That is, as the two sustain electrodes Z ₃ and Z ₄ are continuously arranged as shown in FIG. 5, scan electrodes Y ₁ and Y _m may be arranged on the upper and lower outermost sides of the plasma display panel.

By disposing the scan electrodes (Y ₁ , Y _m ) in the upper and lower outermost portions of the plasma display panel as described above, the abnormal discharge by the accumulated charged particles generated when the sustain electrode (Z) is disposed at the outermost portion is prevented. can do.

6 to 8 illustrate a second embodiment of the electrode arrangement of the plasma display panel according to the present invention, in which address electrodes X ₁ to X _n are separated from the center of the panel. As illustrated in FIGS. 6 to 8, the separated address electrodes X ₁ to X _n are preferably driven up and down, thereby effectively processing a very large amount of image data. In addition, the address electrodes X ₁ to X _n may be separated into three or more.

As shown in FIG. 6, when the separated address electrodes X ₁ to X _n are separated up and down, a data signal is simultaneously applied to the upper address electrodes and the lower address electrodes around the center of the panel. The address discharge is simultaneously generated in any one of the upper discharge cells and one of the lower discharge cells, thereby increasing the period of the sustain pulse.

As a method of separating the address electrodes X ₁ to X _n from the center portion of the panel, the address electrodes X ₁ to X _n are separated by a horizontal partition wall, or the address electrodes X ₁ to X _n . It is preferable to form each separately at the time of formation of an electrode.

Meanwhile, the separated gap Gap between the address electrodes separated at the center of the panel may be 70 μm to 220 μm. When the separated gap between the two address electrodes is 70um to 220um, it is preferable to improve mis-discharge and bright point.

FIG. 6 shows scan electrodes Y and sustain electrodes Z which are closest to the center of the panel _where address electrodes X ₁ to X _n are separated, and address electrodes X ₁ to X _n in FIG. 7. The two electrodes closest to the center of the separated panel) are sustain electrodes (Z _a , Z _{a + 1} ). It is possible to prevent the abnormal discharge occurs due to accumulation of charged particles by placing the electrodes close to the center portion of the panel to the sustain electrode _{(Z a, Z a +1)} .

FIG. 8 illustrates that two electrodes closest to the center of the panel _{where the} address electrodes X ₁ to X _n are separated are scan electrodes Y _a and Y _{a +1} . Thus, by disposing the electrode adjacent to the center portion of the panel as the scan electrodes (Y _a , Y _{a +1} ), it is possible to prevent abnormal discharge due to accumulation of charged particles.

FIG. 9 illustrates a third embodiment of an electrode arrangement of a plasma display panel according to the present invention, wherein dummy electrodes 710 and 720 do not affect a display image outside the effective area 300 of the panel. It is placed. In FIG. 9, the number of lines of the dummy electrodes 710 and 720 is illustrated as three lines each up and down, but the number of lines of the dummy electrodes 710 and 720 may be two or less or four or more. Preferably, a voltage having the same polarity as that of the scan electrode or the sustain electrode located at the outermost side of the effective region is applied to the dummy electrodes 710 and 720, thereby preventing abnormal discharge from the electrodes in the effective region adjacent to the dummy electrode. At this time, the voltage applied to the dummy electrodes 710 and 720 does not affect the address discharge between the scan electrodes (Y ₁ to Y _m ) and the address electrodes (X ₁ to X _n ) of -90V to -50V or less Is preferably.

10 to 16 illustrate cross-sectional views of first to sixth embodiments of the sustain electrode structure of the plasma display panel according to the present invention. This shows an arrangement structure of the sustain electrode pairs 202 and 203 formed in the discharge cells of one of the plasma display panels shown in FIGS. 1 and 2.

As shown in FIG. 10, the sustain electrodes 202 and 203 according to the first embodiment of the present invention are paired to face each other based on the center of the discharge cell on the substrate, and the shape of the sustain electrodes may be symmetrical. It may be asymmetric.

Each of the sustain electrodes is formed in a direction in which at least two electrode lines 202a, 202b, 203a, and 203b cross the address electrode. As illustrated in and described with reference to FIGS. 1 and 2, each of the sustain electrodes may be a double layer including an ITO transparent electrode, and may be formed as a single layer that is an ITOless without the ITO transparent electrode.

At this time, if the electrode line 202a closest to the center of the discharge cell among the at least two electrode lines is called the first electrode line, it is formed by bending in the center direction of the discharge cell. That is, it is formed convexly toward the center of the discharge cell, at least one region of the bent portion may be formed flat.

In addition, in the structure shown in FIG. 10, when the electrode line 202b farthest from the center of the discharge cell among the at least two electrode lines is referred to as a second electrode line, it is bent in the opposite direction to the center of the discharge cell. That is, it is formed convexly toward the partition wall opposite to the center of the discharge cell, at least one region of the bent portion may be formed flat.

As described above, when each of the sustain electrodes includes at least two electrode lines, the distance a between the first electrode lines 202a and 203a facing each other at the center of the discharge cell is preferably 50 μm or more and 120 μm or less. Since the discharge is generated between the opposing first electrode line, when the distance between the first electrode line is close, the discharge start voltage is lowered to increase the discharge efficiency, and when the minimum distance is 50um or more, the discharge diffusion efficiency is increased and the aperture ratio is improved. Here, the discharge start voltage means a voltage level at which discharge starts when a voltage is applied to at least one of the sustain electrode pairs 202 and 203.

In this case, each of the first electrode lines 202a and 203a facing each other at the center of the discharge cell may be bent at the center to form the shortest distance from the center of the electrode line.

As such, although a protrusion electrode such as a tip is formed on the sustain electrode so that the distance between the first electrode line where discharge is generated is close, productivity is low due to a high loss ratio in the process of forming the protrusion electrode. Although there was a problem, the structure in which the first electrode line itself is bent as in the present invention has almost no process loss rate, and thus, productivity and reliability are improved.

In addition, the at least two electrode lines 202 and 203 may have a narrow width in order to improve the aperture ratio. To this end, the width d of the first electrode lines 202a and 203a is finely formed to be 30 μm or more and 40 μm or less, and the width e of the second electrode lines 202b and 203b is 40 μm or more and 50 μm or less. It is preferable to form finely. Of course, since the discharge is generated in the center of the discharge cell, the width of the first electrode line should be smaller than the width of the second electrode line so that the opening ratio is not lowered. Therefore, the width of the first electrode line is formed narrower than the width of the second electrode line.

In addition, the shortest distance (b) of the first and second electrode line is formed to be spaced apart to be 50um or more and 180um or less, and the second electrode line (202b, 203b) partition wall partitioning the discharge cell, in more detail Is preferably formed spaced apart from the horizontal partition wall 30um or more and 80um or less. This facilitates the diffusion of discharge from the center of the discharge cell to the outside and increases the aperture ratio.

The at least two electrode lines 202 and 203 are connected by the bridge electrodes 202c and 203c, and the bridge electrodes are formed in the direction crossing each electrode line. Thus, the discharge generated between the first electrode line is diffused along the bridge electrode to the second electrode line. That is, since the discharge is diffused from the center of the discharge cell to the periphery of the discharge cell through the bridge electrode, the overall light emission efficiency of the plasma display panel is increased.

To this end, the width f of the bridge electrodes 202c and 203c connecting the two electrode lines is formed to have a fine width of 30 μm or more and 50 μm or less, thereby improving the aperture ratio.

The bridge electrode of FIG. 10 is formed to overlap the address electrode formed on the lower substrate along the discharge cell center line while crossing the first and second electrode lines.

As such, when the bridge electrode is formed along the discharge cell center line, the length c of the bridge electrode is formed to be 120 μm or more and 230 μm or less, which is the longest distance between the first and second electrode lines.

In this case, although two electrode lines are formed in this embodiment, the number of electrode lines may be determined in consideration of the aperture ratio.

FIG. 11 is a cross-sectional view illustrating a second embodiment of a sustain electrode structure of the plasma display panel according to the present invention, and descriptions overlapping with those described with reference to FIG. 10 will be replaced with the above description.

In the embodiment of FIG. 11, the bridge electrodes 202c ′ and 203c ′ connecting the two electrode lines are not formed along a virtual discharge cell center line overlapping the address electrode, but more adjacent to the outside from the center of the discharge cell. It relates to a structure formed by deflecting to one side.

In this case, the pair of sustain electrodes formed as the bridge electrodes 202c 'and 203c' are deflected to one side is formed to be symmetrical with respect to the center of the discharge cell. Thus, a region in which light is emitted is compared with that of the first embodiment. It expands and an opening ratio becomes high. To this end, the separation distance h between the bridge electrode and the partition wall partitioning the discharge cell is 20 μm or more and 70 μm or less.

Of course, the bridge electrodes 202c 'and 203c' may be formed to be parallel to the virtual discharge cell centerline in the direction in which the address electrode is formed, as shown in FIG. 11, and may be diagonally formed so as not to be parallel. It may be formed by bending nonlinearly.

FIG. 12 is a cross-sectional view illustrating a third embodiment of the sustain electrode structure of the plasma display panel according to the present invention, and descriptions overlapping with those described with reference to FIG. 10 will be replaced with the above description.

In the third embodiment, the second electrode line 202b ′ is formed in a straight line without any bent portion. That is, the bent portion of the second electrode line of the at least two electrode lines constituting each sustain electrode is formed more smoothly than the first electrode lines 202a and 203a, so that the flatness of the second electrode line is the first electrode line. It is equivalent to greater than the flatness of one electrode line.

In the embodiment of FIG. 12, a bridge electrode is formed at the center of each of the first electrode line that is bent and the second electrode line having a greater flatness than the first electrode line. In the embodiment of FIG. 13, in the electrode structure of the third embodiment, FIG. It relates to a structure in which the bridge electrode is deflected to one side so as to be adjacent to the outside. This is a fourth embodiment.

As shown in the fourth embodiment, since the sustain electrode structure is symmetrical with respect to the center of the discharge cell, the area in which light is emitted is expanded compared to the third embodiment to increase the aperture ratio. To this end, the bridge electrodes 202c 'and 203c' are preferably formed to be spaced apart from the barrier rib partitioning the discharge cells by 20um or more and 70um or less.

FIG. 14 is a cross-sectional view illustrating a fifth embodiment of a sustain electrode structure of the plasma display panel according to the present invention, and descriptions overlapping with those described with reference to FIG. 10 will be replaced with the above description.

14 is similar to the structure of the third embodiment, but at least one protrusion 202d protruding in a direction opposite to the center of the discharge cell is formed in the second electrode lines 202b 'and 203b'. .

In this case, the protrusion 202d is preferably formed in the center of the second electrode line in terms of discharge diffusion efficiency, and a plurality of protrusions may be formed if the aperture ratio is not a problem.

The protrusions 202d may be formed to have a length i of 30 μm or more and 80 μm or less, and the protrusions may contact a horizontal partition wall defining a discharge cell or may be spaced apart by a distance g ′ of 50 μm or less. Thus, the discharge generated between the first electrode lines 202a and 203a facing each other is diffused through the bridge electrodes 202c and 203c to the second electrode lines 202b 'and 203b' and simultaneously to the protrusions 202d and 203d. Since it can be diffused, it is possible to increase the diffusion efficiency from the center of the discharge cell to the outside of the discharge cell compared to the third embodiment.

FIG. 15 is a cross-sectional view illustrating a sixth embodiment of a sustain electrode structure of a plasma display panel according to the present invention, and descriptions overlapping with those described with reference to FIG. 10 will be replaced with the above description.

In the fifth embodiment, the bridge electrodes 202c and 203c are formed at the center of each of the first and second electrode lines. In the sixth embodiment, the bridge electrodes 202c 'and 203c' are further extended to the outside. It relates to a structure that is formed to be biased toward one side to be adjacent.

Thus, although the protrusion is formed as the bridge electrode extends toward the partition wall beyond the second electrode line, the bridge electrode and the protrusion do not form a straight line in the structure of FIG. 15.

However, as shown in FIG. 15, since the sustain electrode structure is symmetrical with respect to the center of the discharge cell, the area in which light is emitted is expanded compared to the fifth embodiment, thereby increasing the aperture ratio. For this purpose, the bridge electrodes 202c 'and 203c' are preferably formed to be spaced apart from the barrier rib partitioning the discharge cells by 20um or more and 70um or less.

As described above, the shortest distance between the first electrode line is formed at the center of the discharge cell as the opposed first electrode line causing the initial discharge is bent. As a result, the discharge start voltage is lowered, and the discharge efficiency is improved. In addition, as the first electrode line is bent, the electrode area increases as compared with a straight parallel electrode line. Accordingly, the discharge start voltage is lowered, the discharge speed is increased, and the wall charge amount is increased after the discharge is started to increase the luminance.

In addition, since a separate protrusion is not formed in order to form a distance between the first electrode lines close to each other, productivity is greatly improved and a higher opening ratio can be ensured than forming a protrusion.

In the electrode structures of the first to sixth embodiments, the separation distance between the first and second electrode lines is formed farthest from the center of each electrode line as the center of the first electrode line is bent toward the center of the discharge cell. As the first and second electrode lines are connected by the bridge electrode, a path in which the discharge is diffused is formed, thereby improving the discharge from the center of the discharge cell toward the outside.

In this case, the bridge electrode connecting the first and second electrode lines may be formed along the center line of the discharge cell, but may be formed to be biased toward one side so as to be close to the outside of the discharge cell to facilitate light emission due to the discharge. .

At least one sustain electrode of the sustain electrode pair including at least two electrode lines may be an electrode including both a transparent electrode and a metal bus electrode line, or may be an electrode formed of only a metal bus electrode without a transparent electrode.

Although the preferred embodiments of the present invention have been described in detail above, those of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit of the present invention as defined in the appended claims. It will be appreciated that the present invention may be modified or modified as described above. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

The plasma display device according to the present invention configured as described above has the effect of lowering the discharge start voltage and improving the discharge efficiency as the first electrode line facing the center of the discharge cell is bent.

In addition, forming the electrode line so that the second electrode line is bent has an effect of improving productivity due to less process loss.

In addition, the discharge diffusion efficiency is improved as the first and second electrode lines are connected by the bridge electrode, and the bridge electrode may be formed to be deflected toward the outside so as to expand an area where light is emitted. It is effective to increase.

Claims (13)

Board; And A sustain electrode formed in pairs on the substrate; The sustain electrode comprises at least two electrode lines across the discharge cell; A bridge electrode connecting the at least two electrode lines; And wherein the electrode line closest to the center of the discharge cell of the at least two electrode lines is bent toward the center of the discharge cell. The method of claim 1, The distance between the electrode lines facing each other at the center of the discharge cell is 50um or more and 120um or less, The plasma display apparatus characterized by the above-mentioned. The method of claim 1, Each electrode line facing each other at the center of the discharge cell, And a shortest distance from the center of the electrode line. The method of claim 1, And the electrode line furthest from the center of the discharge cell among the at least two electrode lines is bent in a direction opposite to the center of the discharge cell. The method of claim 4, wherein The bent portion of the electrode line furthest from the center of the discharge cell of the at least two electrode lines, And a gentler shape than the bent portion of the electrode line closest to the center of the discharge cell. The method of claim 1, And at least one protruding portion protruding in a direction opposite to the center of the discharge cell is the electrode line furthest from the center of the discharge cell among the at least two electrode lines. The method of claim 6, And the protrusion is formed in the center of the electrode line. The method of claim 6, And the protrusion is formed in line with the bridge electrode. The method of claim 6, And the protrusion is formed to have a length of 30 μm or more and 80 μm or less. The method of claim 6, The protruding portion abuts the partition wall partitioning the discharge cell, Or at least 50 μm apart from each other. The method of claim 1, And the bridge electrode is formed to overlap with the address electrode. The method of claim 1, And the bridge electrode is deflected from the center of the discharge cell to the outside so as not to overlap with the address electrode. The method of claim 12, And the bridge electrode is formed spaced apart from the partition wall partitioning the discharge cell by 20um or more and 70um or less.

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