KR100741123B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance an aperture ratio thereby by making line widths of first and second connecting electrodes narrower than a line width of barrier ribs. A scan electrode has three lines of first main electrodes(131 to 133) and plural first connecting electrodes(134) connecting the first main electrodes. The first main electrodes extend in parallel to each other, and the first connecting electrodes are disposed in a direction perpendicular to the first main electrodes. A sustain electrode has three lines of second main electrodes(141 to 143) and plural second connecting electrodes(144) connecting the second main electrodes. The second main electrodes extend in parallel to each other, and the second connecting electrodes are disposed in a direction perpendicular to the second main electrodes.

Description

Plasma display panel {Plasma display panel}

1 is a plan view schematically showing the structure of a plasma display panel according to the prior art.

FIG. 2 is a diagram illustrating an example of a driving method of the plasma display panel illustrated in FIG. 1.

3 is a cutaway perspective view of a schematic portion of a plasma display panel according to an embodiment of the present invention.

FIG. 4 is a plan view schematically illustrating the structure of the plasma display panel illustrated in FIG. 3.

FIG. 5 is a diagram illustrating an example of a driving method of the plasma display panel illustrated in FIG. 3.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 110: first substrate

120: second substrate 130: scanning electrode

131, 132, and 133: first main electrode part 134: first connection electrode part

140: sustain electrode 141, 142, 143: second main electrode portion

144: second connection electrode unit 150: discharge gap

161: first dielectric layer 162: second dielectric layer

170: protective layer 180: address electrode

185: discharge cell 190: partition wall

195 phosphor layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a structure in which luminance uniformity is improved while reducing the number of circuits for driving and an address discharge can be easily performed.

The plasma display panel is a flat panel display panel which displays an image by using gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, and viewing angle. In addition, it has been spotlighted as a next-generation flat panel display panel that can be replaced with a cathode ray tube by being thin and having a large screen display.

1 schematically shows a structure of a conventional plasma display panel. In the illustrated plasma display panel, a plurality of discharge cells 30 are divided by partitions 24 of a matrix pattern extending in a length and width direction, and the scan electrodes span the discharge cells 30 continuously arranged in one direction. Discharge sustaining electrode pairs consisting of a pair of (Y1: Ym) and sustain electrodes (X1: Xm) are arranged, for example, one scan electrode Y1 and one sustain electrode X1 form one discharge sustain electrode pair. . In addition, address electrodes A1: An are disposed over the discharge cells 30 continuously arranged in a direction crossing the discharge sustaining electrode pairs. The scan electrodes Y1: Ym and the sustain electrodes X1: Xm receive a driving signal by the Y driver and the X driver, respectively, and the address electrodes A1: An that intersect them are electrically connected to the address driver. Connected to receive an address signal.

2 illustrates a driving method of the plasma display panel shown in FIG. 1. The plasma display panel is driven by dividing one frame period into several subfields SF having different emission counts for gray scale expression. One subfield SF is divided into a reset section PR, an address section PA, and a sustain section PS.

In the reset period PR, after the ground voltage Vg is applied to all the scan electrodes Y1: Ym, the sustain discharge voltage Vs is rapidly applied, and the rising ramp signal is again applied to the sustain discharge voltage Vs. The maximum rising voltage (Vs + Vset) which rises by the predetermined voltage (Vset) is reached from. Thereafter, the sustain discharge voltage Vs is rapidly applied to the scan electrodes Y1: Ym from the highest rising voltage Vs + Vset, and a falling ramp signal is applied again to the scan electrodes Y1: Ym. The applied voltage drops to the lowest falling voltage V'nf. Meanwhile, while the ground voltage Vg is maintained at the sustain electrodes X1: Xm, while the sustain discharge voltage Vs is applied to the scan electrodes Y1: Ym having the highest rising voltage Vs + Vset, the discharge voltage Vs is constant. A bias voltage Vb of magnitude is applied. The ground voltage Vg is applied to the address electrodes A1: An during the reset period PR.

In the address period PA, scan pulses of the scan low voltage V ′ scl are sequentially applied to the scan electrodes Y1: Ym biased with the scan high voltage V′sch and at the same time, the address electrodes A1: An address signal is applied to An). The address signal applied to each of the address electrodes A1: An is applied with the positive address voltage Va when the discharge cell is selected, and the ground voltage Vg otherwise. Accordingly, when the address signal of the positive address voltage Va is applied while the scan pulse of the scan low voltage V'scl is applied, wall charges are formed by the address discharge in the corresponding discharge cell.

In the sustain period PS, a predetermined sustaining pulse having a predetermined sustain discharge voltage Vs and a ground voltage Vg is applied to all the scan electrodes Y1: Ym and the sustain electrodes X1: Xm. As a result, the discharge cells in which the wall voltage is formed in the address period PA cause sustain discharge.

As described above, according to the related art, since the sustain pulse should be applied to the scan electrodes Y1: Ym and the sustain electrodes X1: Xm, the Y driver for applying a drive signal to the scan electrodes Y1: Ym (See FIG. 1) and an X driver for applying a driving signal to the sustain electrodes X1: Xm, both of which are formed of a circuit board on which a plurality of circuit elements are mounted. This causes a problem that the manufacturing cost of the display device rises.

In addition, the conventional plasma display panel uses transparent indium tin oxide (ITO) electrodes as scan electrodes (Y1: Ym) and sustain electrodes. When the ITO electrode is used, the unit price is high and is formed by a complex process. In the manufacturing process, there was a problem in that a misdischarge occurred between the scan electrodes and the address electrodes.

Therefore, the structure of the discharge electrode that can sufficiently secure the aperture ratio and reduce the luminance decrease, and also facilitate the address discharge, without using the transparent ITO electrode as the scan electrodes Y1: Ym and sustain electrodes. There is a need to develop a plasma display panel panel.

The present invention provides a plasma display panel having a structure for reducing the number of circuits for driving a plasma display panel while improving luminance uniformity and easily performing address discharge without using an ITO electrode as a discharge electrode. To provide.

The present invention is a first substrate; A second substrate arranged in parallel with the first substrate; A plurality of first main electrode portions having different widths and a first connection electrode portion electrically connecting the first main electrode portions, and a scan electrode disposed between the first substrate and the second substrate; field; A plurality of second main electrode portions having a different width, and a second connection electrode portion electrically connected between the second main electrode portions, and disposed between the first substrate and the second substrate and having a constant size. Sustain electrodes to which a constant voltage is applied; A first dielectric layer covering the scan electrode and the sustain electrode; A partition wall disposed between the first substrate and the second substrate and defining a plurality of discharge cells; Address electrodes extending across the second substrate and crossing the scan electrode and the sustain electrode; A second dielectric layer covering the address electrode; A phosphor layer disposed in the discharge cell; And a discharge gas disposed in the discharge cell.

In the present invention, the constant voltage applied to the sustain electrodes may be a ground voltage.

In the present invention, the widths of the first main electrode portions and the second main electrode portions that cross the address electrodes are the widths of the first main electrode portions and the second main electrode portions that do not cross the address electrodes. It can be formed more narrowly.

In the present invention, the first connection electrode portion and the second connection electrode portion may be formed on the partition wall.

In the present invention, the width of the first connection electrode portion and the second connection electrode portion may be formed to be narrower than the width of the partition wall.

In the present invention, the scan electrode and the sustain electrode may be formed of a material including silver (Ag).

In the present invention, the scan electrode and the sustain electrode may be formed including aluminum (Al).

In the present invention, at least a portion of the first dielectric layer may be covered by a protective layer.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

3 is a cutaway perspective view of a schematic part of a plasma display panel according to an embodiment of the present invention, and FIG. 4 is a plan view schematically illustrating a structure of the plasma display panel shown in FIG. 3.

As shown in FIG. 3, the plasma display panel 100 according to the embodiment of the present invention is an AC plasma display panel, and is spaced apart from the transparent first substrate 110 and the first substrate 110 at predetermined intervals. And a second substrate 120 arranged in parallel.

In the present embodiment, since the first substrate 110 is transparent, visible light generated by the discharge passes through the first substrate 110, but the present invention is not limited thereto. That is, while the first substrate of the present invention is opaque, the second substrate may be configured to be transparent, and the first substrate and the second substrate may be configured to be transparent at the same time. In addition, the first substrate and the second substrate of the present invention may be made of a semi-transparent material, it may be configured by embedding a color filter on the surface or inside.

Scan electrodes 130 and sustain electrodes 140, which are discharge electrodes, are formed on the first substrate 110 in pairs with the discharge gap 150 therebetween.

Each of the scan electrodes 130 is provided with a plurality of first electrodes 131, 132, 133 and three lines connecting the first main electrodes 131, 132, 133. 1 includes a connection electrode part 134.

The first main electrode parts 131, 132, 133 of the scan electrode 130 extend in parallel to each other, and the first connection electrode part 134 has the first main electrode parts 131, 132 ( The first main electrode portions 131, 132, and 133 are electrically connected to each other while being vertically intersected with the first and second electrodes 133.

Each of the sustain electrodes 140 also includes a plurality of agents connecting the second main electrode portions 141, 142, and 143 and the second main electrode portions 141, 142 and 143, respectively. It comprises a two connecting electrode portion 144.

The second main electrode parts 141, 142, 143 of the sustain electrode 140 extend in parallel to each other, and the second connection electrode part 144 has a second main electrode part 141, 142 ( The second main electrode portions 141, 142, and 143 are electrically connected to each other so as to vertically cross the 143.

In the present exemplary embodiment, the line width W3 of the first main electrode portions 131, 132, 133 and the second main electrode portions 141, 142, 143 formed on the address electrode 180 is defined as an address. The first main electrode portions 131, 132, 133 and the second main electrode portions 141, 142, 143 that are not formed on the electrode 180 are formed to be narrower than the line width W1. In addition, the first connection electrode part 134 and the second connection electrode part 144 are formed on the partition wall 190, are formed with an arbitrary line width W2, and are formed to be narrower than the line width of the partition wall 190. It is.

The scan electrode 130 and the sustain electrode 140 of the present embodiment are three lines of the first main electrode portions 131, 132, 133, and the second main electrode portions 141, 142, 143, respectively. Although these are provided, this invention is not limited to this. That is, if the discharge can occur while securing the aperture ratio to the extent that the first and second main electrode portions of the present invention have sufficient reflection luminance, the number thereof is not limited. That is, the first and second main electrode portions of the present invention may be formed of two, four, five or more, respectively.

Although the first main electrode parts 131, 132, 133 and the second main electrode parts 141, 142, 143 of the present embodiment extend in parallel to each other, the present invention is not limited thereto. . That is, the first main electrode portions and the second main electrode portions of the present invention do not necessarily have to extend in parallel to each other, and if discharge can occur, they may have a meandering or partial uneven shape having a constant discharge gap therebetween. It may be extended with.

In addition, the first and second connection electrode parts 134 and 144 of the present exemplary embodiment may respectively have first and second main electrode parts 131, 132, and 133 and second and second main electrode parts 141 and 142. (143) has a configuration in which the connection is arranged so as to cross perpendicularly, but the present invention is not limited thereto. That is, the first connection electrode part 134 and the second connection electrode part 144 of the present invention are connected to have a predetermined angle with respect to the direction in which the first main electrode parts and the second main electrode parts extend, respectively. It may be arranged.

Meanwhile, the first main electrode parts 131, 132, and 133, the first connection electrode part 134, the second main electrode parts 141, 142, 143, and the second connection electrode part 144. ) Is formed by mixing a material such as silver (Ag), binder resin, and the like, and then laminating it on the first substrate 110. A metal oxide such as PbO is added if necessary.

The first main electrode parts 131, 132, 133, the first connection electrode part 134, the second main electrode parts 141, 142, 143, and the second connection electrode part ( 144 includes silver (Ag), but the present invention is not limited thereto. That is, the materials of the first main electrode part, the first connection electrode part, the second main electrode part, and the second connection electrode part of the present invention may be applied without particular limitation as long as they are conductive metals. For example, aluminum (Al) It may be made, including.

The first main electrode parts 131, 132, 133, the first connection electrode part 134, the second main electrode parts 141, 142, 143, and the second connection electrode part 144 of the present embodiment. Is limited to one electrode layer, but the present invention is not limited thereto.

Meanwhile, when the scan electrodes 130 and the sustain electrodes 140 having the structure described above are disposed on the first substrate 110, the first dielectric layer 161 is disposed on the scan electrodes 130 and the sustain electrode. 140 is installed while embedding.

The first dielectric layer 161 prevents the scan electrode 130 and the sustain electrode 140 from being directly energized during the sustain discharge, and prevents charged particles from directly colliding with the scan electrode 130 and the sustain electrode 140 and damaging them. In addition, charged charge particles can be induced to accumulate wall charges. Such dielectrics include PbO, B ₂ O ₃ , and SiO _2. Etc. are used.

A protective layer 170 is formed on the first dielectric layer 161, and the protective layer 170 is made of magnesium oxide (MgO).

The protective layer 170 prevents the scan electrode 130 and the sustain electrode 140 from being damaged by the sputtering of the plasma particles and lowers the discharge voltage by emitting secondary electrons.

The address electrode 180 is formed on the second substrate 120. The address electrode 180 performs an address discharge together with the scan electrode 130.

The second dielectric layer 162 is formed while filling the address electrode 180, and the second dielectric layer 162 functions to protect the discharge electrodes like the first dielectric layer 161.

A partition wall 190 made of a dielectric material is formed on the surface of the second dielectric layer 162. The partition wall 190 maintains a discharge distance and functions to prevent electro-optic crosstalk between discharge cells. .

The partition wall 190 of the embodiment of the present invention is formed in a stripe pattern (stripe pattern) in the shape of an open partition wall, but the present invention is not limited thereto. That is, the shape of the partition wall of the present invention may be arranged in the shape of a closed partition wall as a cross-section is made of a polygon, such as a rectangle, a triangle, a pentagon, or a circle, an oval, or the like.

The partition wall 190 forms a discharge space together with the scan electrode 130, the sustain electrode 140, and the address electrode 180, which are called unit discharge cells, and the unit discharge cells form a pixel. do.

Meanwhile, at least one first connection electrode part 134 and second connection electrode part 144 formed on the partition wall 190 are included in each unit discharge cell, and such a structure may include a first main electrode part ( The current flows smoothly between the lines of the 131, 132, and 133 and between the lines of the second main electrode portions 141, 142, 143, and the first main electrode portions 131, 132. In preparation for the short circuits of the 133 and the second main electrode portions 141, 142, 143, the sustain discharge and the address discharge are surely performed.

Phosphor layers 195 are formed by applying red, green, and blue phosphors on both bottom surfaces of the second dielectric layer 162 and the sidewalls of the barrier rib 190 of the discharge cell.

The phosphor layers 195 have a component that generates ultraviolet light by receiving ultraviolet rays. The red phosphor layer formed in the red light emitting cell includes phosphors such as Y (V, P) O ₄ : Eu, and the like. The formed green phosphor layer includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue phosphor layer formed in the blue light emitting discharge cell includes a phosphor such as BAM: Eu or the like.

After the first substrate 110 and the second substrate 120 are sealed, the space inside the assembled plasma display panel 100 is filled with air, thereby completely removing the air in the assembled plasma display panel 100. By exhausting, air is replaced with an appropriate discharge gas capable of increasing the efficiency of discharge. As the discharge gas, a mixed gas such as Ne-Xe, He-Xe, He-Ne-Xe is often used.

Meanwhile, as shown in FIG. 4, in the present exemplary embodiment, the first main electrode parts 131, 132, and 133 and the second main electrode parts 141 and 142 (formed on the address electrode 180) ( The line widths W3 of the first and second main electrode portions 131, 132, and 133 and the second main electrode portions 141, 142, and 143 are not formed on the address electrode 180. Narrower than (W1). This is to reduce the area between the address electrode 180 and the scan electrode 140 to prevent erroneous discharge and facilitate the opposite discharge.

 In addition, the first connection electrode part 134 and the second connection electrode part 144 are formed on the partition wall 190, and the line widths of the first connection electrode part 134 and the second connection electrode part 144 are partition walls. It is formed narrower than the line width of 190. This is to improve the efficiency of the panel by improving the aperture ratio.

In the present invention, the width W2 of the first connection electrode part 134 and the second connection electrode part 144 formed on the partition wall 190 is any one of the first main electrode parts 131, 132, and 133. There is no particular limitation on the width as long as the short circuit or the one of the second main electrode portions 141, 142, 143 can stably pass electricity even if the short circuit occurs.

As shown in FIG. 4, the scan electrodes 140 and Y1: Ym are electrically connected to the Y driver to receive a driving signal, and the address electrodes 180 and A1: An are electrically connected to the address driver. The address signal is applied. On the other hand, a constant voltage, for example, a ground voltage Vg, is applied to the sustain electrodes 130 and X1: Xm, and a separate signal for applying a driving signal to the sustain electrodes 130 and X1: Xm is applied. X drive is not required. That is, in a sustain period in which an image is implemented, a sustain pulse made of a predetermined AC voltage is applied only to the scan electrodes 140 and Y1: Ym, and a ground voltage of a constant level is applied to the sustain electrodes 130 and X1: Xm. Vg) is applied. As a result, discharge is actively performed in the vicinity of the scan electrodes 140 and Y1: Ym, but discharge is relatively weak in the vicinity of the sustain electrodes 130 and X1: Xm where a constant constant voltage is maintained. In the portion where the scan electrodes 140 and Y1: Ym are disposed and the portion where the sustain electrodes 130 and X1: Xm are disposed, the emission level is different.

Hereinafter, a driving method of the plasma display panel illustrated in FIG. 3 will be described in detail with reference to FIG. 5. In the driving method basically applied to the plasma display panel, the reset period PR, the address period PA, and the sustain period PS are sequentially performed to form one subfield SF.

First, the driving signal applied to the scan electrodes 130 and Y1: Ym in the reset period PR will be maintained at the scan electrodes 130 and Y1: Ym in which the ground voltage Vg is applied. The discharge voltage Vs is rapidly applied. Thereafter, a rising ramp signal is applied to the scan electrodes 130 and Y1: Ym to rise from the sustain discharge voltage Vs by a predetermined voltage Vset to reach the highest rising voltage Vs + Vset. The weak discharge is executed by this rising ramp signal, and as a result, negative charges start to accumulate in the vicinity of the scan electrodes 130 and Y1: Ym. Thereafter, the sustain discharge voltage Vs is rapidly applied to the scan electrodes 130 and Y1: Ym, and a falling ramp signal falling from the sustain discharge voltage Vs to the lowest falling voltage Vnf is applied. Here, in the driving method of the plasma display panel of the present invention, the ground voltage Vg is applied to the sustain electrodes 140 and X1: Xm to maintain the ground state, which is maintained in the conventional driving method shown in FIG. 2. It is necessary to compensate for the bias voltage Vb applied to the electrode. Therefore, in the driving method of the present invention, the falling ramp signal applied to the scan electrodes 130 and Y1: Ym drops more rapidly than in the prior art, and as a result, the lowest falling voltage Vnf that is reached is lower than in the prior art. You lose.

As a result of the continuous drop of voltage applied to the scan electrodes 130 and Y1: Ym, a discharge occurs. As a result, some of the negative charges accumulated in the scan electrodes 130 and Y1: Ym are emitted. This means that an appropriate level of negative charges remain in the vicinity of the scan electrodes 130 and Y1: Ym. Meanwhile, a constant level constant voltage, for example, a ground voltage Vg is applied to the sustain electrode pairs 140 and X1 and Xm and the address electrodes 180 and A1 and An during the reset period PR. Through such a reset period PR, the charge states of all the discharge cells become uniform.

Next, a predetermined wall voltage is generated in the selected discharge cells in the address period PA. In detail, the scan pulses of the scan low voltage Vscl are sequentially applied to the scan electrodes 130 and Y1: Ym biased with the scan high voltage Vsch. 180, A1: An), an address signal is applied. The address signal applied to each of the address electrodes 180 and A1: An is applied with the address voltage Va when the discharge cell is selected and the ground voltage Vg when the discharge cell is selected. Meanwhile, the ground voltage Vg is continuously applied to the sustain electrodes 140 and X1: Xm following the reset period PR. In the selected discharge cells, the address voltage Va is applied to the address electrodes 180 and A1: An, the scan low voltage Vscl and the scan electrodes 130 are applied to the scan electrodes 130 and Y1: Ym. The address discharge is performed by the wall voltage due to the negative charge accumulated near Y1: Ym) and the wall voltage due to the positive charge accumulated near the address electrodes 180 and A1: An. As a result of the address discharge, positive charges are accumulated near the scan electrodes 130 and Y1: Ym, and negative charges are accumulated near the sustain electrodes 140 and X1: Xm.

In the sustain period PS, a predetermined sustain pulse is applied to the scan electrodes 130 and Y1: Ym, so that the discharge cells in which the wall voltage is accumulated cause sustain discharge. That is, the sustain pulses having the positive sustain discharge voltage Vs and the negative sustain discharge voltage (-Vs) are alternately applied to the scan electrodes 130 and Y1: Ym, thereby scanning the wall voltage formed by the address discharge. When the sustain discharge voltage Vs applied to the electrodes 130 and Y1 and Ym overlaps and the discharge start voltage or more is applied, the discharge is performed. Meanwhile, during the sustain period, the ground voltage Vg is applied to the sustain electrodes 140 and X1 and Xm and the address electrodes 180 and A1 and An to maintain the ground state.

According to the plasma display panel of the present invention, the following effects can be achieved.

First, the plasma display panel of the present invention can be driven with fewer circuit boards than in the prior art. Therefore, the manufacturing cost of the plasma display device including the same can be significantly reduced, as well as the cost and process required for the heat radiation design or the vibration suppression design of the circuit board.

Secondly, in the plasma display panel of the present invention, the line widths of the first main electrode portions and the second main electrode portions formed on the address electrode are not formed on the address electrode without using the material of the scan electrode and the sustain electrode as the ITO electrode. By forming the thinner than the line widths of the first and second main electrode portions and forming the first and second connecting electrode portions on the partition wall, it is possible to easily perform the address discharge with the address electrode. Therefore, it is possible to improve the image quality by improving the accuracy of the addressing action of the plasma display panel.

Third, since the opening ratio is increased by forming the first connection electrode part and the second connection electrode part on the partition wall, the efficiency of the panel can be improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (8)

A first substrate; A second substrate arranged in parallel with the first substrate; A plurality of first main electrode portions having different widths and a first connection electrode portion electrically connecting the first main electrode portions, and a scan electrode disposed between the first substrate and the second substrate; field; A plurality of second main electrode portions having a different width, and a second connection electrode portion electrically connected between the second main electrode portions, and disposed between the first substrate and the second substrate and having a constant size. Sustain electrodes to which a constant voltage is applied; A first dielectric layer covering the scan electrode and the sustain electrode; A partition wall disposed between the first substrate and the second substrate and defining a plurality of discharge cells; Address electrodes extending across the second substrate and crossing the scan electrode and the sustain electrode; A second dielectric layer covering the address electrode; A phosphor layer disposed in the discharge cell; And It includes a discharge gas disposed in the discharge cell, Widths of the first and second main electrode portions crossing the address electrodes may be narrower than widths of the first and second main electrode portions not crossing the address electrodes. Plasma display panel. The method of claim 1, And a constant voltage applied to the sustain electrodes is a ground voltage. delete The plasma display panel of claim 1, wherein the first connection electrode part and the second connection electrode part are formed on the partition wall. The plasma display panel of claim 4, wherein a width of the first connection electrode part and the second connection electrode part is smaller than a width of the barrier rib. The method of claim 1, The scan electrode and the sustain electrode are formed of a material containing silver (Ag). The method of claim 1, The scan electrode and the sustain electrode are formed of aluminum (Al). The method of claim 1, And at least a portion of the first dielectric layer is covered by a protective layer.

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