KR20090126069A - Plasma display device thereof - Google Patents

Abstract

PURPOSE: A plasma display panel apparatus is provided to reduce fabrication cost by removing transparent electrodes from scan and sustain electrodes. CONSTITUTION: A plasma display panel apparatus comprises a top substrate(10), a first electrode(12), a second electrode(13), a third electrode(23), a bottom substrate(20) and a barrier rib. The first and the second electrodes are arranged on the top substrate. The bottom substrate is arranged to face with the top substrate. The third electrode and the barrier rib are formed on the bottom substrate. The barrier rib has a horizontal barrier rib(22b). The horizontal barrier rib crosses with the third electrode. The horizontal barrier rib corresponds to a black matrix on the top substrate. The first electrode has first and second electrode lines, and first and second protruded electrodes. The first and the second electrode lines cross with the third electrode. The first electrode line is arranged in the vicinity of a discharge cell. The first protruded electrode is protruded toward the center of the discharge cell from the first electrode line. The second protruded electrode is protruded toward the horizontal barrier rib from the second electrode line. The black matrix is separated into first and second black matrixes. The first and the second black matrixes are arranged around the second protruded electrode.

Description

Plasma display device

The present invention relates to a plasma display device, and more particularly, to an electrode structure of a panel provided in the plasma display device.

In general, a plasma display panel is a partition wall formed between an upper substrate and a lower substrate to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays (Vacu μm Ultraviolet rays), and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because a thin and light configuration is possible.

In a typical plasma display panel, a scan electrode and a sustain electrode are formed on an upper substrate, and the scan electrode and the sustain electrode are laminated with a transparent electrode and a bus electrode made of expensive ITO (Indiμm Tin Oxide) to secure an aperture ratio of the panel. Has a structure.

Recently, the focus is on manufacturing a plasma display panel that can secure sufficient viewing characteristics, driving characteristics, and the like, while reducing manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device capable of reducing the manufacturing cost of a panel and improving the brightness of a display image by removing the transparent electrode made of ITO in a panel provided in the plasma display device.

Plasma display device according to the present invention for solving the above technical problem, the upper substrate; First and second electrodes formed on the upper substrate; A lower substrate disposed to face the upper substrate; And a third electrode and a partition wall formed on the lower substrate, wherein the partition wall includes a horizontal partition wall formed in a direction crossing the third electrode and having a black matrix formed on the partition wall. First and second electrode lines formed in a direction crossing the three electrodes; A first protruding electrode protruding toward the center of the discharge cell from the first electrode line further adjacent to the center of the discharge cell among the first and second electrode lines; And a second protruding electrode protruding from the second electrode line in the transverse bulkhead direction, wherein the black matrix has a first region of the transverse bulkhead overlapping at least a portion of an extension line of the second protruding electrode. And first and second black matrices separated from each other.

According to the plasma display device according to the present invention configured as described above, it is possible to reduce the manufacturing cost of the plasma display panel by removing the transparent electrode made of indium tin oxide (ITO), discharge efficiency and display using the protruding electrode The brightness of the image can be improved. In addition, by changing the structure of the black matrix formed on the partition wall of the panel, it is possible to reduce the occurrence of defects of the panel upper substrate and to simplify the manufacturing process.

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

Referring to FIG. 1, the plasma display panel includes an upper panel 10 and a lower panel 20 that are bonded at predetermined intervals.

The upper panel 10 includes a pair of sustain electrodes 12 and 13 formed in pairs on the upper substrate 11. The sustain electrode pairs 12 and 13 are divided into the scan electrode 12 and the sustain electrode 13 according to their function. The sustain electrode pairs 12 and 13 are covered by the upper dielectric layer 14 which limits the discharge current and insulates the electrode pairs, and a protective film layer 15 is formed on the upper dielectric layer 204, so that during the gas discharge. The upper dielectric layer 14 is protected from sputtering of charged particles generated, and the emission efficiency of secondary electrons is increased.

Discharge gas is injected into the discharge space provided between the upper substrate 11, the lower substrate 21, and the partition wall 22. Preferably, the discharge gas contains 10% or more of xenon (Xe). When the xenon (Xe) is included in the discharge gas with the above mixing ratio, the discharge / light emitting efficiency and the luminance of the plasma display panel can be improved.

The lower panel 20 is formed with a plurality of discharge spaces, that is, partitions 22 partitioning the discharge cells on the lower substrate 21. In addition, the address electrodes 23 are disposed in a direction crossing the sustain electrode pairs 22 and 23, and the surface of the lower dielectric layer 25 and the partition wall 22 are emitted by ultraviolet rays generated during gas discharge to generate visible light. Phosphor 24 is applied.

In this case, the partition wall 22 includes a vertical partition wall 22a formed in a direction parallel to the address electrode 23, and a horizontal partition wall 22b formed in a direction crossing the address electrode 23, and physically distinguishes the discharge cells. In addition, ultraviolet rays and visible light generated by the discharge are prevented from leaking to the adjacent discharge cells.

Further, in the plasma display panel according to the present invention, the sustain electrode pairs 12 and 13 consist of only opaque metal electrodes. That is, the ITO, which is a conventional transparent electrode material, is not used, and the sustain electrode pairs 12 and 13 are formed using silver (Ag), copper (Cu), chromium (Cr), or the like, which is a material of the conventional bus electrode. . That is, each of the electrode pairs 12 and 13 of the plasma display panel according to the present invention does not include a conventional ITO electrode and is formed of one layer of a bus electrode.

For example, each of the sustain electrode pairs 12 and 13 according to the embodiment of the present invention is preferably formed of silver, and silver (Ag) preferably has photosensitive properties. In addition, each of the sustain electrode pairs 12 and 13 according to an exemplary embodiment of the present invention has a darker color and lower light transmittance than the upper dielectric layer 14 or the lower dielectric layer 14 formed on the upper substrate 11. Can have properties.

The discharge cell may have a symmetrical structure in which the phosphor layers 24 each of R (Red), G (Green), and B (Blue) have the same pitch, or have an asymmetric structure having different pitches. When the discharge cells have an asymmetrical structure, the discharge cells may have the order of the width of the R (Red) cell <the width of the G (Green) cell <the width of the B (Blue) cell.

As shown in FIG. 1, sustain electrodes 12 and 13 may be formed of a plurality of electrode lines in one discharge cell. That is, the first storage electrode 12 is formed of two electrode lines 12a and 12b, and the second storage electrode 13 is symmetrically arranged with the first storage electrode 12 based on the center of the discharge cell. Two electrode lines 13a and 13b may be formed.

Preferably, the first and second sustain electrodes 12 and 13 are scan electrodes and sustain electrodes, respectively. This takes into account the aperture ratio and the discharge diffusion efficiency by using the opaque sustain electrode pairs 12 and 13. That is, an electrode line having a narrow width is used in consideration of the aperture ratio, while a plurality of electrode lines are used in consideration of discharge diffusion efficiency. In this case, the number of electrode lines may be determined by considering the aperture ratio and the discharge diffusion efficiency simultaneously.

Since the structure shown in FIG. 1 is only an embodiment of the structure of the plasma panel according to the present invention, the present invention is not limited to the structure of the plasma display panel shown in FIG. 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 11 includes a black matrix (BM). 11) can be formed on the black matrix, both of the detachable and integral BM structure is possible.

In addition, although the barrier rib structure of the panel shown in FIG. Stripe Type) or a structure such as a Fish Bone having a protrusion formed at a predetermined interval on the vertical partition wall.

FIG. 2 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 2. The plurality of discharge cells are provided at the intersections of the scan electrode lines Y1 to Ym, the sustain electrode lines Z1 to Zm, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zm may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines, or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrode lines among the scan electrode lines Y1 to Ym are simultaneously scanned is possible. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down or left and right in the center portion of the panel.

3 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. 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 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 the 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, a plasma display panel may be driven by dividing one frame into eight or more subfields, 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 a drive signal for driving a plasma display panel.

The subfield is a wall formed by a pre-reset section and a pre-reset section for forming positive wall charges on the scan electrodes Y and negative wall charges on the sustain electrodes Z. It may include a reset section for initializing the discharge cells of the entire screen by using the charge distribution, an address section for selecting the discharge cells, and a sustain section for maintaining the discharge of the selected discharge cells. have.

The reset section is composed of 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 discharge in all discharge cells. As a result, 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 scan signal having a negative scan voltage Vsc is sequentially applied to the scan electrode, and at the same time, a positive data signal 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, in order to increase the efficiency of the address discharge, a sustain bias voltage Vzb is applied to the sustain electrode during the address period.

During the address period, the plurality of scan electrodes Y may be divided into two or more groups, and scan signals may be sequentially supplied to each group, and each of the divided groups may be further divided into two or more subgroups and sequentially by the subgroups. Scan signals can be supplied. For example, the plurality of scan electrodes Y is divided into a first group and a second group, and scan signals are sequentially supplied to scan electrodes belonging to the first group, and then scan electrodes belonging to the second group Scan signals may be supplied sequentially.

According to an embodiment of the present invention, the plurality of scan electrodes Y may be divided into a first group located at an even number and a second group located at an odd number according to a position formed on a panel. In another embodiment, the panel may be divided into a first group positioned above and a second group positioned below the center of the panel.

The scan electrodes belonging to the first group divided by the above method are further divided into a first subgroup located at an even number and a second subgroup located at an odd number, or the first group. The first subgroup positioned above and the second group positioned below may be divided based on the center of the.

In the sustain period, a sustain pulse having a sustain voltage Vs 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 width of the first sustain signal or the last sustain signal among the plurality of sustain signals alternately supplied to the scan electrode and the sustain electrode in the sustain period may be greater than the width of the remaining sustain pulses.

After the sustain discharge occurs, an erase period for erasing the wall charge remaining in the scan electrode or the sustain electrode of the selected ON cell in the address period by generating a weak discharge may be further included after the sustain period.

The erase period may be included in all or some of the plurality of subfields, and the erase signal for the weak discharge is preferably applied to the electrode to which the last sustain pulse is not applied in the sustain period.

The cancellation signal is a ramp-type signal that gradually increases, a low-voltage wide pulse, a high-voltage narrow pulse, an exponential signal, or half Sinusoidal pulses can be used.

In addition, a plurality of pulses may be sequentially applied to the scan electrode or the sustain electrode to generate the weak discharge.

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, and the polarity and the voltage level of the driving signals illustrated in FIG. 4 may be changed as necessary. After the sustain discharge is completed, an erase signal for erasing wall charge may be applied to the sustain electrode. May be authorized. 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.

5 to 20 illustrate cross-sectional views of embodiments of an electrode structure formed on an upper substrate of a plasma display panel according to the present invention, wherein a pair of sustain electrodes formed in one discharge cell of the plasma display panel shown in FIG. Only the structure of (12, 13) is shown briefly.

Referring to FIG. 5, the storage electrodes 110 and 120 according to the exemplary embodiment of the present invention are formed in a symmetrical pair on the substrate with respect to the center of the discharge cell. Each of the sustain electrodes 110 and 120 is connected to at least two electrode lines 111, 112, 121, and 122 crossing the discharge cell and the electrode lines 112 and 121 closest to the center of the discharge cell. Two protruding electrodes 114, 115, 124, and 125 protruding in the center direction may be included.

In addition, each of the sustain electrodes 110 and 120 may further include connection electrodes 113 and 123 connecting the two electrode lines 111 and 112, 121 and 122.

The electrode lines 111, 112, 121, and 122 cross the discharge cells and extend in one direction of the plasma display panel. The electrode line according to the embodiment of the present invention is formed to have a narrow width to always maintain the aperture ratio. In addition, although a plurality of electrode lines 111, 112, 121, and 122 are used to improve the discharge diffusion efficiency, it is preferable to determine the number of electrode lines in consideration of the aperture ratio.

The protruding electrodes 114, 115, 124, and 125 lower the discharge start voltage when the plasma display panel is driven. That is, since discharge is initiated even between the protruding electrodes 111, 112, 121, and 122 formed adjacent to each other, the discharge start voltage of the plasma display panel can be lowered. Here, the discharge start voltage may mean a voltage level at which discharge starts when a pulse is supplied to at least one of the sustain electrode pairs 110 and 120.

The connecting electrodes 113 and 123 help the discharges initiated through the protruding electrodes 111, 112, 121, and 122 to easily diffuse from the center of the discharge cell to the far electrode lines 111 and 122.

As described above, the discharge start voltage is reduced by the protruding electrodes 111, 112, 121, and 122, and the discharge is performed by using the connection electrodes 113 and 123 and the plurality of electrode lines 111, 112, 121, and 122. By increasing the diffusion efficiency, it is possible to improve the luminous efficiency of the plasma display panel as a whole. Accordingly, the ITO transparent electrode can be removed without reducing the luminance of the plasma display panel.

Referring to FIG. 6, as the distance d1 between two adjacent electrode lines 111 and 112 increases, the aperture ratio of the panel may increase, but the discharge diffusion efficiency may decrease, and the two protruding electrodes 114 generating the discharge may occur. , The discharge start voltage may increase when the interval d2 between 124 increases.

Table 1 below shows the result of measuring the discharge start voltage according to the change of the distance d1 between two adjacent electrode lines 111 and 112 and the distance d2 between the protruding electrodes 114 and 124. Since the size of the discharge cell is limited, the distance d2 between the protruding electrodes 114 and 124 may decrease as the distance d1 between two adjacent electrode lines 111 and 112 increases.

FIG. 21 illustrates the relationship between d1 / d2 and the discharge start voltage according to the measurement result of Table 1. FIG.

Referring to Table 1 and FIG. 21, as d1 / d2 decreases, the distance d1 between two adjacent electrode lines 111 and 112 decreases to improve discharge diffusion efficiency, and thus, d1 is 4.6 times d2. When the discharge start voltage is reduced to 180V or less.

However, when d1 / d2 exceeds 1.8 times, the discharge start voltage rapidly increases with the increase of the interval d2 between the protruding electrodes 114 and 124 to increase above 187V.

Therefore, when the distance d1 between two adjacent electrode lines 111 and 112 is 1.8 times to 4.6 times the distance d2 between the protruding electrodes 114 and 124, the discharge start voltage is stabilized to a low voltage of about 180V. Can be reduced.

In addition, the gap d1 between two adjacent electrode lines 111 and 112 may be a protruding electrode in order to secure an aperture ratio of the panel to prevent a decrease in luminance of the display image and to uniformly generate discharge in all areas of the discharge cell. It may be 2.1 to 2.8 times the interval d2 between (114, 124).

Assuming that the lengths of the protruding electrodes 114 and 124 are 50 μm to 100 μm, the two sustain electrode lines having different distances d1 between two adjacent electrode lines 111 and 112 according to the measurement results of Table 1 are different from each other. When 0.6 times to 1.5 times the interval d4 between 112 and 121, the discharge start voltage can be stably reduced to a low voltage of about 180V.

On the other hand, assuming that the spacing d2 between the protruding electrodes 114 and 124 is constant, the spacing d1 between the two adjacent electrode lines 111 and 112 and between the electrode line 111 and the partition wall 100. The interval d3 may be in inversely proportional relationship. As described above, when the distance d1 between two adjacent electrode lines 111 and 112 increases, the discharge generation region of the discharge cell is widened, but the discharge diffusion efficiency may decrease.

When discharge occurs only in a partial region of the discharge cell, deterioration of the quality of the speckle may occur in the display image.

Therefore, when the distance d1 between the two electrode lines 111 and 112 adjacent to each other is 1 to 1.7 times the distance d3 between the electrode line 111 and the partition wall 100, the discharge is generated in all areas of the discharge cell. It is possible to reduce the deterioration of the image quality occurring in the display image by making it evenly occur.

Referring to FIG. 7, widths b1 and b2 of two adjacent electrode lines 111 and 112 may be different from each other.

When the wall charges formed on the two electrode lines 111 and 112 are different due to the address discharge, the amount of light generated during the sustain discharge may be different depending on the positions of the two electrode lines 111 and 112, thereby causing stain on the display image. Deterioration of the quality of the pattern may occur.

For example, since the wall charges are formed by the discharge of the electrode line 111 located at the outer side of the discharge cell among the two electrode lines 111 and 112, the address is higher than that of the electrode line 112 adjacent to the center of the discharge cell. The amount of wall charges formed by the discharge may be small. Therefore, the width b1 of the electrode line 111 positioned outside the discharge cell is larger than the width b2 of the electrode line 112 adjacent to the center of the discharge cell, thereby forming the two electrode lines 111 and 112. The wall charge can be made uniform.

As described above, by uniformizing the amount of wall charges formed on the two electrode lines 111 and 112, it is possible to evenly generate discharge in all areas of the discharge cell, thereby reducing the deterioration in image quality generated in the display image.

Table 2 below shows the result of measuring the occurrence and the luminance of the speckle in the display image according to the change of the width (b1, b2) of the two adjacent electrode lines (111, 112).

Referring to Table 2, when the width b1 of the electrode line 111 positioned outside the discharge cell is 44 μm or more, no deterioration in image quality such as a spot pattern occurs in the display image. However, when the width b1 of the electrode line 111 positioned outside the discharge cell exceeds 80 µm, the luminance of the display image is rapidly decreased to 460 cd / m ² or less.

Therefore, when the width b1 of the electrode line 111 positioned at the outer side of the discharge cell is 1.1 to 2 times the width b2 of the electrode line 112 adjacent to the center of the discharge cell, deterioration of image quality of the display image is prevented. At the same time, the brightness can be improved.

Also, in order to increase the wall charges formed in the electrode lines 111 located at the outer side of the discharge cells without significantly reducing the discharge diffusion efficiency, to make the wall charges formed in the two electrode lines 111 and 112 uniform. The width b1 of the electrode line 111 positioned at the outside of the electrode line 111 may be 1.15 to 1.5 times the width b2 of the electrode line 112 adjacent to the center of the discharge cell.

As described with reference to Table 1, the distance d1 between two adjacent electrode lines 111 and 112 may be 180 μm to 230 μm, and as described with reference to Table 2, the gap d1 is located at the outer side of the discharge cell. Since the width b1 of the electrode line 111 may be 44 μm to 80 μm, the distance d1 between two adjacent electrode lines 111 and 112 may be equal to the width of the electrode line 111 located at the outer side of the discharge cell. It may be 2.25 times to 5.2 times of (b1).

For the above reason, the widths c1 and c2 of the two adjacent electrode lines 121 and 122 positioned below the discharge cell may have different values within the above range.

Referring to FIG. 8, the bottom widths of the protruding electrodes 214, 215, 224, and 225 protruding from the electrode lines 212 and 221 may be different from the top width thereof. . Accordingly, the protruding electrodes 214, 215, 224, and 225 may be separated from the electrode lines 212 and 221 by an external impact lamp, thereby preventing the plasma display panel from being damaged.

By the structure of the protruding electrodes 214, 215, 224, and 225 as described above, the discharge efficiency may be improved by increasing the surface area where discharge may occur between the protruding electrodes 214, 215, 224, and 225.

Table 3 below shows the result of measuring the damage of the electrode and the generation of the speckles of the display image according to the change of the bottom width w1 of the protruding electrode 214.

Referring to Table 3, when the bottom width w1 of the protruding electrode 214 is 20 μm, damage of the protruding electrode due to external pressure does not occur, and the bottom width w1 of the protruding electrode 214 is 135 μm. In the case of exceeding, intervals between adjacent protruding electrodes 214 and 224 are non-uniform, causing vertical speckles in the display image.

Therefore, when the lower width w1 of the protruding electrode 214 is 0.7 times to 4.5 times the upper width w2, damage of the protruding electrode may be prevented and the deterioration of image quality of the display image may be reduced.

In addition, in order to reduce the discharge start voltage and improve the discharge diffusion efficiency, the bottom width w1 of the protruding electrode 214 may be two or more times the top width w2.

In addition, when the distance between the lower ends of the two protruding electrodes 214 and 215 adjacent to each other is 0.9 to 2 times the lower width w1 of the protruding electrode 214, the aperture ratio of the panel is ensured and the discharge cells are evenly distributed in all areas of the discharge cell. Discharge may occur.

In addition, as shown in FIGS. 10 and 11, the cross-sectional shape of the inclined surfaces of the protruding electrodes 216, 217, 218, and 219 is curved to form a surface area of the protruding electrodes 216, 217, 218, and 219 for discharge. By increasing the discharge efficiency can be improved.

Referring to FIG. 12, the black matrices 330 and 340 may be formed on the partition 300 to improve the opening ratio of the panel, and the width a1 of the black matrices 330 and 340 may be defined by the partition 300. It may be smaller than the width a2.

In addition, to improve the aperture ratio of the panel and to improve the clear contrast of the display image, the width a1 of the black matrices 330 and 340 may be 0.5 times or more of the width a2 of the partition 300.

Meanwhile, the black matrices 330 and 340 formed on the partition walls and the electrodes 310 and 320 formed on the upper substrate of the panel may be simultaneously baked, thereby simplifying the panel manufacturing process and reducing the time spent on the process. You can.

However, when simultaneously firing the electrodes 310 and 320 and the black matrix 330 and 340 having the structure as shown in FIG. 12, the outer electrode lines 311 and 322 and the black matrix 330 and 340 are formed. There may be difficulties in forming the electrode panel such as shorting each other.

In particular, as shown in FIG. 13, when the electrodes 310 and 320 of the upper substrate include second protruding electrodes 316 and 326 protruding from the outer electrode lines 311 and 322 in the direction of the horizontal partition wall adjacent thereto. In the case of co-firing, the second protruding electrodes 316 and 326 and the black matrix 330 and 340 may short-circuit to cause an error in driving the panel.

In the case of the plasma display device according to the present invention, the black matrices 331 and 332 formed on the horizontal barrier ribs may have a structure separated from the central portion of the horizontal barrier ribs, and thus, the electrodes 310 and 320 of the upper substrate may be separated. The pattern may be easily formed and the short circuits of the electrodes 310 and 320 and the black matrix 330 and 340 of the upper substrate may be prevented.

13 is a cross-sectional view showing a first embodiment of a black matrix structure formed on the upper substrate of the plasma display device according to the present invention.

Referring to FIG. 13, the second protruding electrodes 316 and 326 allow the discharge generated between the first protruding electrodes 314, 315, 324, and 325 to diffuse up and down the upper and lower outer portions of the discharge cell, thereby improving discharge efficiency. The brightness of the display image may be increased.

In addition, the black matrices 331 and 332 may have a structure separated from each other with a first region 350 overlapping an extension line (indicated by a dashed line) of the second protruding electrode 316 among the horizontal partition walls. Accordingly, it is possible to prevent the black matrices 331 and 332 and the second protruding electrode 316 on the horizontal partition wall from being short-circuited during the simultaneous firing.

Referring to FIG. 14, the spacing between two black matrices 331 and 332 separated from each other in order to effectively prevent a short circuit of the black matrices 331 and 332 and the second protruding electrode 316 on the horizontal partition wall during co-firing. It is preferable that e1 is larger than the width e2 of the second protruding electrode 316.

However, as the distance e1 between the two black matrices 331 and 332 increases, the contrast of the display image may decrease, and as the width e2 of the second protruding electrode 316 decreases, the efficiency of discharge diffusion is increased. This can be reduced.

Therefore, in order to improve the discharge diffusion efficiency and the ease of forming the electrode pattern without significantly reducing the contrast of the display image, the distance e1 between the two black matrices 331 and 332 separated from each other is equal to that of the second protruding electrode 316. It is preferable that it is 1.4 times-2.1 times the width e2.

As another embodiment of the plasma display device according to the present invention, the black matrix 330 formed on the horizontal partition wall may have a width at the center portion of the horizontal partition wall smaller than the width of the remaining portion. Therefore, the pattern formation of the electrodes 310 and 320 of the upper substrate may be facilitated, and the short circuit of the electrodes 310 and 320 and the black matrix 330 of the upper substrate may be prevented.

15 is a cross-sectional view of a second embodiment of a black matrix structure formed on an upper substrate of a plasma display device according to the present invention.

Referring to FIG. 15, the black matrix 330 may have a concave groove formed in the direction of the second protruding electrode 316, and more specifically, the second protruding electrode 316 of the horizontal partition wall of the black matrix 330 may be formed. A groove may be formed in the first region 350 overlapping the extension line (indicated by the dotted line).

That is, the black matrix 330 has a width t1 in the first region 350 overlapping with an extension line (indicated by a dashed line) of the second protruding electrode 316 in the horizontal partition wall than the width t2 in the remaining region. Can be small. Accordingly, the black matrix 330 and the second protruding electrode 316 on the horizontal partition wall may be prevented from being short-circuited during the simultaneous firing.

However, as the width t1 of the black matrix 330 in the first region 350 decreases, contrast of the display image may decrease and difficulty in pattern formation of the black matrix 330 may occur.

Referring to FIG. 16, the black matrix 330 and the second protruding electrode 316 may be easily formed while facilitating the pattern formation of the black matrix 330 and the upper substrate electrodes 310 and 320 without significantly reducing the contrast of the display image. In order to prevent a short circuit, the depth g2 of the groove 333 formed in the black matrix 330 is preferably 0.85 to 1.5 times the length g1 of the second protruding electrode 316.

Referring to FIG. 17, the shape of the groove 333 formed in the black matrix 330 may have a round cross section other than the shape shown in FIG. 16.

In addition, referring to FIG. 18, in order to prevent the second protruding electrodes 316 and 366 formed on two vertically adjacent discharge cells and the black matrix 330 formed on the horizontal partition wall from being short-circuited at the same time, the black matrix ( The central portion 350 of the 330 may be formed with two or more grooves concave in the vertical direction.

At this time, the contrast of the display image is not greatly reduced, and the pattern of the black matrix 330 and the upper substrate electrodes 310 and 320 may be easily formed, and the black matrix 330 and the second protruding electrodes 316 and 366 may be formed. In order to prevent a short circuit of the black matrix 330, the width h1 of the first region 350 is preferably 0.15 to 0.4 times the width h2 of the remaining region.

Referring to FIG. 19, the shape of two or more grooves formed in the black matrix 330 may have various shapes other than the shape shown in FIG. 18.

As shown in FIG. 20, the plasma display panel according to the present invention may further include protruding electrodes 417 and 427 protruding from the electrode lines 411 and 422 positioned outside the discharge cells among the electrode lines. .

In addition, the number of protruding electrodes 414, 415, 416, 424, 425, and 426 protruding from the electrode lines 412 and 421 adjacent to the center of the discharge cell among the electrode lines may be 6 or more.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

1 is a perspective view showing an embodiment of the structure of a plasma display panel according to the present invention.

2 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel.

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 a waveform of a driving signal for driving a plasma display panel.

5 to 20 are cross-sectional views illustrating embodiments of an electrode structure formed on an upper substrate of a plasma display panel according to the present invention.

21 is a graph showing a discharge start voltage measurement result of the plasma display panel according to the present invention.

Claims (9)

Upper substrate; First and second electrodes formed on the upper substrate; A lower substrate disposed to face the upper substrate; And a third electrode and a partition formed on the lower substrate. The partition wall may include a horizontal partition wall formed in a direction crossing the third electrode and having a black matrix formed on the partition wall. The first electrode may include first and second electrode lines formed in a direction crossing the third electrode; A first protruding electrode protruding toward the center of the discharge cell from the first electrode line further adjacent to the center of the discharge cell among the first and second electrode lines; And a second protruding electrode protruding from the second electrode line in the horizontal partition wall direction. And the black matrix includes first and second black matrices separated from each other with a first area of the horizontal partition wall overlapping an extension line of at least a portion of the second protruding electrode. The method of claim 1, And a spacing between the first and second black matrices is 1.4 to 2.1 times the width of the second protruding electrode. The method of claim 1, And the width of the second electrode line is greater than the width of the first electrode line. The method of claim 3, And the width of the second electrode line is 1.1 to 2 times the width of the first electrode line. The method of claim 1, And a spacing between the first and second electrode lines is 2.25 to 5.2 times the width of the first electrode line. Upper substrate; First and second electrodes formed on the upper substrate; A lower substrate disposed to face the upper substrate; And a third electrode and a partition formed on the lower substrate. The partition wall may include a horizontal partition wall formed in a direction crossing the third electrode and having a black matrix formed on the partition wall. The first electrode may include first and second electrode lines formed in a direction crossing the third electrode; A first protruding electrode protruding toward the center of the discharge cell from the first electrode line further adjacent to the center of the discharge cell among the first and second electrode lines; And a second protruding electrode protruding from the second electrode line in the horizontal partition wall direction. The width of the black matrix formed on the first region overlapping at least a part of the extension line of the second protruding electrode of the horizontal partition wall is narrower than the width of the black matrix formed on the remaining region except the first region And a plasma display device. The method of claim 6, The black matrix formed on the first region of the horizontal partition wall has a recess formed in the direction of the second protruding electrode. The method of claim 7, wherein And the depth of the groove is 0.85 to 1.5 times the length of the second protruding electrode. The method of claim 6, And a width of the black matrix formed on the first region of the horizontal partition wall is 0.15 to 0.4 times the width of the black matrix formed on the remaining region.

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