KR100520832B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel which can improve a discharge efficiency by providing a plurality of discharge gaps per discharge cell.

The present invention provides a plasma display panel in which discharge cells in which discharge spaces are partitioned by partitions are formed in a matrix form, the discharge cells comprising: first and second scan electrodes facing each other in a first diagonal direction; First and second sustain electrodes facing each other in a second diagonal direction crossing the first diagonal direction; The scan electrode and the sustain electrode include a transparent electrode and a bus electrode for supplying a driving signal to the transparent electrode, wherein the bus electrode includes a main bus electrode formed to overlap the partition wall; And an auxiliary bus electrode protruding from the main bus electrode and connected to the transparent electrode.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel which can improve discharge efficiency by providing a plurality of discharge gaps per discharge cell.

Plasma Display Panels (hereinafter referred to as "PDPs") are characterized by emitting phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

The discharge cells of the PDP shown in FIGS. 1 and 2 include a pair of sustain electrodes formed on the upper substrate 10, that is, scan electrodes Y and sustain electrodes Z, and data formed on the lower substrate 18. An electrode X is provided.

Each of the scan electrode Y and the sustain electrode Z of the sustain electrode pair has a line width smaller than the line widths of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed at one edge of the transparent electrode. (13Y, 13Z). The transparent electrodes 12Y and 12Y are usually formed on the upper substrate 10 by indium tin oxide (ITO). The bus electrodes 13Y and 13Z are usually made of metal such as chromium (Cr) and formed on the transparent electrodes 12Y and 12Z so as to overlap the partition wall 24, thereby reducing the voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. It serves to reduce.

An upper dielectric layer 14 and a passivation layer 16 are formed on the upper substrate 10 on which the sustain electrode pairs Y and Z are formed. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The passivation layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The data electrode X is formed in a direction crossing the scan electrode Y and the sustain electrode Z. A lower dielectric layer 22 for wall charge accumulation is formed on the lower substrate 18 on which the data electrode X is formed. The partition wall 24 is formed on the lower dielectric layer 22, and the phosphor 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The partition wall 24 is formed in parallel with the data electrode X and prevents ultraviolet rays and visible rays generated by the discharge from leaking into the adjacent discharge cells. The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The discharge cell of this structure is selected by the counter discharge between the data electrode X and the sustain electrode Y, and then sustains the discharge by the surface discharge between the sustain electrode pairs Y and Z. In such a discharge cell, the fluorescent material 26 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted to the outside of the cell. As a result, the discharge cells adjust the period during which the discharge is maintained to implement gray scale, and the PDP in which the discharge cells are arranged in a matrix form displays an image.

In the conventional PDP, display light is mainly emitted from a discharge gap provided by scan electrodes Y and sustain electrodes Z arranged in parallel as shown in FIG. 3. However, since there is only one discharge gap for each discharge cell, the overall efficiency decreases relatively.

Accordingly, an object of the present invention is to provide a plasma display panel which can improve the discharge efficiency by providing a plurality of discharge gaps per discharge cell.

In order to achieve the above object, the plasma display panel according to the present invention includes a pair of sustain electrodes formed on a second substrate facing each other with the first substrate and the partition wall interposed therebetween, and the pair of sustain electrodes are mutually aligned in a first direction. And a plurality of scan electrodes facing each other, and a plurality of sustain electrodes facing each other in a second direction crossing the first direction.

The plurality of scan electrodes may include first and second scan electrodes facing in a diagonal direction, and the plurality of sustain electrodes may include first and second sustain electrodes facing in a direction crossing the diagonal direction. It is done.

The first scan electrode and the first sustain electrode face up and down with a first discharge gap therebetween, and the second scan electrode and the second sustain electrode face up and down with a second discharge gap parallel to the first discharge gap. The first scan electrode and the second sustain electrode face each other with the third discharge gap interposed therebetween, and the second scan electrode and the first sustain electrode have the fourth discharge gap parallel to the third discharge gap. It is characterized by facing left and right in between.

Each of the plurality of scan electrodes and the plurality of sustain electrodes includes a transparent electrode formed on the first substrate and a bus electrode supplying a driving signal to the transparent electrode.

The bus electrode may include a main bus electrode formed to overlap the partition wall, and an auxiliary bus electrode protruding from the main bus electrode and connected to the transparent electrode.

The partition wall includes a first partition wall overlapping the main bus electrode, and a second partition wall perpendicular to the first partition wall and parallel to the data electrode.

The auxiliary bus electrode may be formed to cross the transparent electrode in a diagonal direction.

The auxiliary bus electrode may be formed to cross a discharge space provided by the partition wall in a diagonal direction.

An edge portion of one of the plurality of scan electrodes and the sustain electrodes is removed in a direction parallel to the auxiliary bus electrode.

The plasma display panel may further include a data electrode parallel to the vertical partition wall.

The data electrode may face the auxiliary bus electrode included in the scan electrode crossing the discharge space provided by the partition wall.

The data electrode may be opposed to a start portion and an end portion of an auxiliary bus electrode included in a scan electrode formed at one side of a discharge space provided by the partition wall.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 8.

4 is a plan view illustrating a PDP according to the present invention, and FIG. 5 is a cross-sectional view illustrating a PDP cut along the line "I-I '" in FIG. 4.

The discharge cells of the PDP shown in FIGS. 4 and 5 include an upper substrate 110 having sustain electrode pairs, first and second scan electrodes Y1 and Y2, and first and second sustain electrodes Z1 and Z2. And a lower substrate 118 having a data electrode X formed thereon.

Each of the first and second scan electrodes Y1 and Y2 and the first and second sustain electrodes Z1 and Z2 includes transparent electrodes 112Y and 112Z and bus electrodes 113Y and 113Z.

The transparent electrodes 112Y and 112Z are usually formed on the upper substrate 110 by indium tin oxide (ITO). The transparent electrodes 112Y of the first and second scan electrodes Y1 and Y2 face each other in a diagonal direction, and the transparent electrodes 112Z of the first and second sustain electrodes Z1 and Z2 face each other in a diagonal direction. . That is, the transparent electrode of the first scan electrode Y1 and the transparent electrode of the first sustain electrode Z1 face up and down with the first discharge gap W1 interposed therebetween, as shown in FIG. 6, and the second scan. The transparent electrode of the electrode Y2 and the transparent electrode of the second sustain electrode Z2 face up and down with the second discharge gap W2 interposed therebetween, and the transparent electrode and the second sustain electrode of the first scan electrode Y1 are face to face. The transparent electrode of Z2 faces left and right with the third discharge gap W3 interposed therebetween, and the transparent electrode of the second scan electrode Y2 and the first sustain electrode Z1 have a fourth discharge gap ( Facing from side to side with W4) in between. The driving voltages supplied through the pads (not shown) are supplied to the transparent electrodes 112Y and 112Z through the auxiliary bus electrodes 113b and 113d connected to the main bus electrodes 113a and 113c.

On the other hand, the transparent electrodes 112Y and 112Z facing each other in the opposite direction to the formation directions of the auxiliary bus electrodes 113b and 113d have their edges removed, so that the discharge gaps W1, W2, W3, and W4 are removed. , W5, W6) are the same. As a result, wall charges are prevented from concentrating on the corners of the transparent electrodes 112Y and 112Z, so that the amount of wall charges accumulated in each of the transparent electrodes 112Y and 112Z is the same, resulting in uniform discharge characteristics.

The bus electrodes 113Y and 113Z are made of metal such as chromium (Cr), and are formed on the transparent electrodes 112Y and 112Z to reduce voltage drop caused by the transparent electrodes 112Y and 112Z having high resistance. The bus electrodes 113Y and 113Z include main bus electrodes 113a and 113c overlapping the horizontal partition wall 124a and auxiliary bus electrodes 113b and 113d connected to the main bus electrodes 113a and 113c. That is, the main bus electrode 113a of the scan electrode Y is connected to the auxiliary bus electrode 113b crossing the transparent electrode 112Y of the scan electrode Y in an oblique direction, and the main bus of the sustain electrode Z. The electrode 113c is connected to the auxiliary bus electrode 113d crossing the transparent electrode 112Z of the sustain electrode Z in an oblique direction.

The upper dielectric layer 114 and the passivation layer 116 are formed on the upper substrate 110 on which the sustain electrode pairs Y and Z are formed. The upper dielectric layer 114 accumulates wall charges generated during plasma discharge. The passivation layer 116 prevents damage to the upper dielectric layer 114 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 116, magnesium oxide (MgO) is usually used.

The data electrode X is formed parallel to the vertical partition wall 124b on the lower substrate 118.

The odd-numbered data electrode of the data electrode X overlaps the auxiliary bus electrode 113b of the scan electrode Y that crosses the center of the discharge cell, and the sustain electrode Z is positioned at the outer portion of the discharge cell. Overlap with the auxiliary bus electrode 113d. Accordingly, in the discharge cell including the odd-numbered data electrode X, the address discharge occurs at the center of the discharge cell by the scan electrode Y positioned at the center of the discharge cell, so that the address discharge characteristics are relatively low. Is improved.

The even (odd) data electrode of the data electrodes X overlaps the auxiliary bus electrode 113d of the sustain electrode Z crossing the center of the discharge cell, and is located in the outer portion of the discharge cell. Overlap with the auxiliary bus electrode 113b. Accordingly, in the discharge cell including the even (odd) -th data electrode X, the address discharge occurs at the outer edge of the discharge cell by the scan electrode Y positioned at the outer side of the discharge cell.

The lower dielectric layer 122 for wall charge accumulation is formed on the lower substrate 118 on which the data electrode X is formed. The partition wall 124 is formed on the lower dielectric layer 122, and the phosphor 126 is coated on the surfaces of the lower dielectric layer 122 and the partition wall 124.

The partition wall 124 prevents ultraviolet rays and visible rays generated by the discharge from leaking into adjacent discharge cells. The partition wall is formed in a closed shape including a vertical partition wall 124b parallel to the data electrode X and a horizontal partition wall 124a intersecting the vertical partition wall 124b. The horizontal partition wall 124a partially overlaps the transparent electrodes 112Y and 112Z and overlaps with the main bus electrodes 113a and 113c so that the transparent electrode of the scan electrode (sustain electrode) and the main bus electrode of the sustain electrode (scan electrode) are formed. To prevent the mis-discharge of the liver.

The phosphor 126 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower substrates 110 and 118 and the partition wall 124.

This PDP is driven by being divided into an initialization period (RPD) for initializing the full screen, an address period (APD) for selecting a cell, and a sustain period (SPD) for maintaining the discharge of the selected cell, as shown in FIG. .

In the initialization period, the reset pulse RP is supplied to the first and second scan electrodes Y1 and Y2. The reset pulse RP has a ramp wave form in which a rising ramp waveform increases in voltage during set-up and a falling ramp waveform in which voltage decreases in set-down. During setup, setup discharges occur in the cells of the full screen. This setup discharge causes positive wall charges to accumulate on the data electrode X and the first and second sustain electrodes Z1 and Z2, and negative wall charges on the first and second scan electrodes Y1 and Y2. Will accumulate.

The falling ramp waveform falling from the positive voltage lower than the peak voltage of the rising ramp waveform during the set down is applied to the first and second scan electrodes Y1 and Y2 simultaneously. The falling ramp waveform causes some of the overcharged wall charges by causing a slight erase discharge in the cells. By this set-down discharge, the wall charges such that the address discharge can be stably generated remain uniformly in the cells.

In the address period, the first and second negative scan pulses (scan) supplied through the main bus electrodes 13a and 13c of the first and second scan electrodes Y1 and Y2 are connected to the auxiliary bus electrodes 13b and 13d. The positive data pulse data is applied to the data electrodes X in synchronization with the scan pulse scan while being sequentially applied to the transparent electrodes of the two scan electrodes Y1 and Y2. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the initialization period are added, an address discharge is generated in the cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when a sustain voltage is applied.

The positive and negative DC voltages Zdc are supplied to the first and second sustain electrodes Z1 and Z2 during the setdown period and the address period of the initialization period. The DC voltage Zdc causes a setdown discharge between the first and second sustain electrodes Z1 and Z2 and the first and second scan electrodes Y1 and Y2 in the setdown period and the first and second periods in the address period. The first and second sustain electrodes Z1 and Z2 and the first and second scan electrodes (1 and Z2) are disposed so that a discharge does not occur largely between the second scan electrodes Y1 and Y2 and the first and second sustain electrodes Z1 and Z2. The voltage difference between Y1 and Y2 or between the first and second sustain electrodes Z1 and Z2 and the data electrode X is set.

In the sustain period, a sustain pulse su is alternately applied to the first and second scan electrodes Y1 and Y2 and the first and second sustain electrodes Z1 and Z2. At this time, a potential difference is generated between the first scan electrode Y1 and the first and second sustain electrodes Z1 and Z2, and the second scan electrode Y2 includes the first and second sustain electrodes Z1 and Z2. All positions are generated in between. Accordingly, in the cell selected by the address discharge, the first scan electrode Y1 and the first and second sustain electrodes (S1) are applied every time the sustain pulse sus is applied while the wall voltage and the sustain pulse sus in the cell are added. Sustain discharge, that is, display discharge, occurs between Z1 and Z2 and between the second scan electrode Y2 and the first and second sustain electrodes Z1 and Z2. That is, a sustain discharge occurs as shown in FIG. 8 between at least two discharge gaps provided by the first and second scan electrodes Y1 and Y2 and the first and second sustain electrodes Z1 and Z2.

As described above, the plasma display panel according to the present invention is provided with at least two discharge gaps in which the display light is mainly emitted, so that the light emitting gap is widened, thereby increasing the luminous efficiency. In addition, the scan electrode positioned at the center of the discharge space improves the address characteristic and helps sustain discharge, thereby lowering the sustain voltage. In addition, the address discharge and sustain discharge characteristics are improved, thereby improving the overall driving margin.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a plan view illustrating a conventional plasma display panel.

FIG. 2 is a cross-sectional view illustrating the plasma display panel shown in FIG. 1.

3 is a plan view illustrating a sustain discharge phenomenon of the plasma display panel illustrated in FIG. 1.

4 is a plan view showing a plasma display panel according to the present invention.

FIG. 5 is a cross-sectional view illustrating the plasma display panel taken along the line "I-I '" in FIG.

FIG. 6 is a plan view illustrating in detail the transparent electrode illustrated in FIG. 4.

FIG. 7 is a waveform diagram illustrating driving waveforms of the plasma display panel illustrated in FIG. 4.

FIG. 8 is a plan view illustrating a sustain discharge phenomenon of the plasma display panel illustrated in FIG. 7.

<Description of Symbols for Main Parts of Drawings>

X: Data electrode Y: Scan electrode

Z: sustain electrode 10,110: upper substrate

12Y, 12Z, 112Y, 112Z: transparent electrode 13Y, 13Z, 113Y, 113Z: bus electrode

14,22,114,122: dielectric layer 16,116 protective film

18,118: lower substrate 24,124: bulkhead

26,126 phosphor

Claims (12)

In a plasma display panel in which discharge cells in which discharge spaces are partitioned by partition walls are formed in a matrix form, The discharge cell First and second scan electrodes facing each other in a first diagonal direction; First and second sustain electrodes facing each other in a second diagonal direction crossing the first diagonal direction; The scan electrode and the sustain electrode include a transparent electrode and a bus electrode for supplying a driving signal to the transparent electrode. The bus electrode may include a main bus electrode formed to overlap the partition wall; And an auxiliary bus electrode protruding from the main bus electrode and connected to the transparent electrode. delete The method of claim 1, The first scan electrode and the first sustain electrode face up and down with a first discharge gap therebetween, The second scan electrode and the second sustain electrode face up and down with a second discharge gap parallel to the first discharge gap interposed therebetween. The first scan electrode and the second sustain electrode face left and right with a third discharge gap therebetween, And the second scan electrode and the first sustain electrode face each other from side to side with a fourth discharge gap parallel to a third discharge gap interposed therebetween. delete delete The method of claim 1, The partition wall A first partition wall overlapping the main bus electrode; And a second partition wall perpendicular to the first partition wall and parallel to the data electrode. The method of claim 1, And the auxiliary bus electrode is formed to cross the transparent electrode in a diagonal direction. The method of claim 7, wherein And the auxiliary bus electrode is formed to cross a discharge space provided by the partition wall in a diagonal direction. The method of claim 1, And at least one of the plurality of scan electrodes and one of the sustain electrodes has edges removed in parallel with the auxiliary bus electrodes. The method of claim 6, And a data electrode parallel to the vertical partition wall. The method of claim 10, And the data electrode faces an auxiliary bus electrode included in a scan electrode crossing a discharge space provided by the partition wall. The method of claim 10, And the data electrode is opposite to a start portion and an end portion of an auxiliary bus electrode included in a scan electrode formed on one side of a discharge space provided by the partition wall.