KR100647650B1 - Plasma display panel - Google Patents

Abstract

The present invention aims to provide a plasma display panel in which the sustain discharge voltage and the address discharge voltage are reduced, and the brightness is increased. In order to achieve this object, the present invention provides a rear substrate and parallel to the rear substrate. A front panel disposed between the front substrate, the front substrate and the rear substrate, partition walls defining the discharge cells, sustain electrode pairs disposed between the front substrate and the partition walls, and extending across the discharge cells; And intermediate electrodes disposed between the pair of sustain electrodes, a first dielectric layer formed to cover the sustain electrode pairs and the intermediate electrodes, and to cross the sustain electrode pair and the intermediate electrode in the discharge cell. Address electrodes extending across the discharge cells, a second dielectric layer formed to cover the address electrodes, and in the discharge cells Provided is a plasma display panel comprising a phosphor layer disposed and a discharge gas in the discharge cell, the width of the partition wall portion disposed behind the sustain electrode pairs is smaller than the width of the adjacent partition wall portion. .

Description

Plasma display panel {Plasma display panel}

1 is a partially cutaway perspective view of a typical plasma display panel;

2 is a partially cutaway perspective view of a plasma display panel according to an embodiment of the present invention;

3 is a cross-sectional view taken along line III-III of FIG. 2, showing a state in which the upper plate is rotated 90 degrees,

4 is a layout view illustrating an arrangement of partition walls and electrodes illustrated in FIG. 2;

FIG. 5 is a block diagram illustrating a plasma display device including the plasma display panel of FIG. 2.

6 is a waveform diagram of signals applied to electrodes disposed in one discharge cell of the plasma display panel of FIG. 2 in a unit sub-field.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 111: front substrate

112: sustain electrode pair 113: intermediate electrode

115: first dielectric layer 116: protective film

121: back substrate 122: address electrode

126: phosphor 130: partition wall

131: X electrode 132: Y electrode

W1, W2, W3: width of bulkhead

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a reduced sustain discharge voltage and an address discharge voltage. The present invention also relates to a plasma display panel with increased brightness.

Recently, a plasma display panel, which is drawing attention as a replacement of a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern by the ultraviolet rays is excited to obtain a desired image.

The general AC plasma display panel 10 includes an upper plate 50 showing an image to a user and a lower plate 60 coupled in parallel with each other, as shown in FIG. 1. On the front substrate 11 of the upper plate 50, a pair of sustain electrodes 12, which are paired with the X electrode 31 and the Y electrode 32, is arranged, and the pair of sustain electrodes 12 of the front substrate 11 On the rear substrate 21 of the lower substrate 60 opposite to the disposed surface, the address electrodes 22 are disposed to intersect the electrodes 31 and 32 of the front substrate 11. The first dielectric layer 15 and the first dielectric layer 15 may be embedded in each surface of the front substrate 11 having the sustain electrode pairs 12 and the rear substrate 21 having the address electrodes 22. 2 dielectric layers 25 are formed. A protective layer 16, usually made of MgO, is formed on the rear surface of the first dielectric layer 15, and maintains a discharge distance on the front surface of the second dielectric layer 25 and prevents electro-optic crosstalk between discharge cells. The partition 30 is formed. Red, green, and blue light emitting phosphors 26 are coated on both side surfaces of the partition wall 30 and on the entire surface of the second dielectric layer 25 on which the partition wall 30 is not formed. Each of the X electrode 31 and the Y electrode 32 includes transparent electrodes 31a and 32a and bus electrodes 31b and 32b. The space formed by the pair of X electrodes 31 and Y electrodes 32 arranged in this way and the address electrodes 22 intersecting the same form one discharge unit as the unit discharge cells 70.

In the plasma display panel 10 having such a shape, in order to increase the discharge area, the distance between the X electrode 31 and the Y electrode 32 must be arranged far. This is because when the distance between the X electrode 31 and the Y electrode 32 is far, the discharge space is increased and discharge is actively generated. However, when the distance between the X electrode 31 and the Y electrode 32 increases, there is a problem that power consumption increases because the discharge start voltage increases. Further, since the distance between the address electrode 22 and the Y electrode 32 causing the address discharge is far, and some of the Y electrodes 32 do not participate in the discharge by the partition wall 30, the address voltage is increased. There is a problem.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a plasma display panel in which the discharge space is enlarged to increase the luminance and reduce the sustain discharge voltage.

Another object of the present invention is to provide a plasma display panel having a reduced address discharge voltage in a discharge cell.

Another object of the present invention is to provide a plasma display panel with improved luminance.

In order to achieve the above and other objects, the present invention provides a rear substrate, a front substrate disposed in parallel and spaced apart from the rear substrate, and disposed between the front substrate and the rear substrate and partitioning the discharge cells. A pair of storage electrodes disposed between the barrier rib, the front substrate and the barrier rib, extending across the discharge cells, intermediate electrodes disposed between the pair of sustain electrodes, the pair of sustain electrodes and A first dielectric layer formed to cover the intermediate electrodes, address electrodes extending across the discharge cells to intersect the sustain electrode pair and the intermediate electrode in the discharge cell, and a second dielectric layer formed to cover the address electrodes And a partition layer having a phosphor layer disposed in the discharge cells and a discharge gas in the discharge cell, and arranged behind the sustain electrode pairs. Provides minutes PDP, characterized in that formed narrower than the width of the partition portion at which the width of the adjacent.

In the present invention, the barrier rib includes horizontal barrier rib portions arranged in parallel to the sustain electrode pairs, and vertical barrier rib portions intersecting the horizontal barrier rib portions, and disposed at the rear of the sustain electrode pairs at the vertical barrier rib portions. It is preferable that the width of the divided portions is formed to be smaller than the width of the adjacent portions.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

2 and 3, an AC plasma display panel 100 according to an exemplary embodiment of the present invention is illustrated. FIG. 2 is a partially cutaway perspective view of the plasma display panel, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, wherein FIG. 3 is a view illustrating a state in which the upper plate 150 is rotated 90 degrees for convenience of description. Indicates.

As shown, the plasma display panel 100 includes a top plate 150 and a bottom plate 160 coupled in parallel therewith, and are provided on the front substrate 111 and the bottom plate 160 provided on the top plate 150. The plurality of discharge cells 170 are partitioned by the partition wall 130 between the rear substrates 121.

A plurality of sustain electrode pairs 112 are disposed on the front substrate 111. In this case, the front substrate 111 is generally formed of a transparent material mainly made of glass.

The sustain electrode pair 112 refers to a pair of sustain electrodes 131 and 132 formed on the rear surface of the front substrate 111 to cause sustain discharge, and the sustain electrode pair 112 is formed on the front substrate 111. It is arranged in parallel at predetermined intervals. Each of the sustain electrode pairs 112 includes an X electrode 131 and a Y electrode 132. In the present embodiment, the sustain electrode pairs 112 are disposed on the rear surface of the front substrate 111, but the arrangement position of the sustain electrode pairs is not limited thereto. For example, the sustain electrode pairs may be spaced apart from the rear surface of the front substrate at predetermined intervals. However, the sustain electrode pairs are preferably arranged at the same level from the front substrate.

Each of the X electrode 131 and the Y electrode 132 includes transparent electrodes 131a and 132a and bus electrodes 131b and 132b. The transparent electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor 126 from advancing to the front substrate 111. Such a material is indium tin (ITO). oxide). However, transparent conductors such as ITO generally have a high resistance, and thus, when the sustain electrode is formed only of the transparent electrodes, a large voltage drop in the longitudinal direction consumes a lot of driving power and slows the response speed. To this end, bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the transparent electrode. The bus electrode may be formed in a single layer structure using a metal such as Ag, Al, or Cu, but may be formed to have a multilayer structure such as Cr / Al / Cr. Such transparent electrodes and bus electrodes are formed using a photo etching method, a photolithography method, or the like.

Looking at the shape and arrangement of the X electrode 131 and the Y electrode 132 in detail, the transparent electrodes 131a, 132a are spaced apart at predetermined intervals from the unit discharge cells are arranged in parallel, the discharge cells 170 Extends across. The bus electrodes 131b and 132b are disposed on the edges of the transparent electrodes 131a and 132a. Also, referring to the drawings, one side of the transparent electrodes 131a and 132a is electrically connected to the bus electrodes 131b and 132b, and the other side thereof is disposed to face the center direction of the discharge cell 170.

The intermediate electrode 113 is disposed between the paired X electrode 131 and the Y electrode 132. The intermediate electrode 113 is formed on the rear surface of the front substrate 111 and extends in one direction across the discharge cells 170 in parallel with the X electrode 131 and the Y electrode 132. In addition, the bus electrode 113b of the intermediate electrode is preferably spaced apart from the pair of the X electrode 131 and the Y electrode 132 at substantially the same distance.

The intermediate electrode 113 also includes a transparent electrode 113a and a bus electrode 113b. The intermediate electrode 131 may be disposed at a different level from the X electrode 131 and the Y electrode 132, but the X electrode 131 and the Y electrode 132 may be disposed to perform the electrode forming process in the same process. It is preferable to be disposed at the same level from the front substrate 111.

The first dielectric layer 115 is formed on the front substrate 111 to fill the sustain electrode pairs 112 and the intermediate electrodes 113. The first dielectric layer 115 may be directly energized between adjacent sustain electrodes 131 and 132 and the intermediate electrode 113 during discharge, and positive or negative electrons may be applied to the sustain electrodes 131 and 132 and the intermediate electrode 113. While preventing direct damage by damaging the electrodes 131, 132, 113, it is formed of a dielectric that can induce charge and accumulate wall charges. Such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ . have.

The protective layer 116 is formed to cover the first dielectric layer 115. The protective layer 116 prevents cations and electrons from colliding with the first dielectric layer 115 during the discharge and damaging the first dielectric layer 115. In addition, the protective layer 116 emits a large amount of secondary electrons during discharge, thereby smoothing plasma discharge. The protective layer 116 performing this function is formed using a material having a high secondary electron emission coefficient and a high visible light transmittance.

As the protective layer 116, a material including MgO is formed on the first dielectric layer as a thin film. The protective layer 116 is mainly formed by sputtering or electron beam deposition after other processes of the upper plate 150 are completed.

On the front surface of the back substrate 121, address electrodes 122 intersecting with the X electrode 131, the Y electrode 132, and the intermediate electrode 113 are disposed in the unit discharge cell 170. The address electrodes 122 are intended to cause an address discharge to facilitate sustain-discharge between the X electrode 131 and the Y electrode 132, and more specifically, serve to lower a voltage for sustain-discharge. . In the above, the address discharge is a discharge occurring between the intermediate electrode 132 and the address electrode 122.

The space formed by the pair of X electrodes 131, Y electrodes 132, and the intermediate electrodes 113 and the address electrodes 122 intersecting the same is formed as a unit discharge cell 170 as one discharge unit. Done.

The second dielectric layer 125 is formed on the rear substrate 121 to fill the address electrode 122. The second dielectric layer 125 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrode 122 during discharge and damaging the address electrode 122. Such dielectrics include PbO and B ₂ O ₃ , SiO ₂ and the like.

The partition wall 130 functions to prevent optical crosstalk between the discharge cells 170. In the present embodiment, the partition wall 130 partitions the discharge cells 170 having rectangular cross sections. However, the barrier rib 130 may be a barrier rib of various patterns, for example, a closed barrier rib such as a waffle, a matrix, a delta, or the like, as long as it can form a plurality of discharge spaces. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon such as a triangle, a square, a pentagon, or a circle, an ellipse, or the like.

In the present embodiment, the partition wall 130 includes horizontal partition walls 130a and vertical partition walls 130b. The horizontal bulkhead portions 130a are disposed in parallel to the direction in which the sustain electrode pairs 112 extend (x direction), and the vertical bulkhead portions 130b are disposed in a direction (y direction) that intersects the horizontal bulkhead portions 130a. It is arranged to be parallel. Therefore, the unit discharge cell 170 having a substantially rectangular cross section is partitioned by opposing horizontal bulkhead portions 130a and vertical bulkhead portions 130b intersecting the horizontal bulkhead portions 130a.

4 illustrates a layout view of the partition wall 130 and the electrodes 131, 132, and 113 illustrated in FIG. 2. As illustrated, the width W1 of the portion A disposed behind the intermediate electrode 113 in the vertical partition portion 130b is smaller than the width W2 of the adjacent portion. However, the vertical bulkheads 130b also preferably have a symmetrical shape with respect to the longitudinal direction (y direction).

The concave longitudinal partition portion A increases the area of the intermediate electrode participating in the discharge. In other words, the first dielectric layer 115 between the vertical partition portions 130b and the intermediate electrode 113 may not contribute to plasma discharge because space charges are not accumulated by the vertical partition portions. However, in the present invention, since the narrow vertical partition portion A has a structure in which the area of the intermediate electrode participating in the discharge is increased, the discharge is effectively generated and the discharge voltage is reduced. In more detail, in the address discharge, the area of the intermediate electrode participating in the discharge is increased to increase the amount of wall charges. Thus, the address discharge voltage is reduced. In addition, even during sustain discharge, the area of the partition wall is reduced, the discharge area is increased, the amount of space charge hit by the partition wall is extinguished, and the movement of the space charge becomes active, so that the discharge voltage is reduced and luminance is increased. Is improved.

The horizontal partition walls 130a are formed to have a predetermined width W3 unlike the vertical partition walls 130b.

Red, green, and blue light emitting phosphor layers 126 are formed on the side surfaces of the barrier rib 130 and the entire surface of the second dielectric layer 125 between the barrier ribs 130. The phosphor layer 126 has a component that generates ultraviolet light by receiving ultraviolet rays. The red phosphor layer formed in the red discharge cell includes a phosphor such as Y (V, P) O ₄ : Eu, and the green discharge cell. The red light emitting phosphor layer formed on the substrate includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layer formed on the blue discharge cell includes a phosphor such as BAM: Eu.

In addition, the discharge cells 170 are filled with a discharge gas in which neon (Ne), xenon (Xe), etc. are mixed, and in the state where the discharge gas is filled as described above, the front and rear substrates 111 and 121 The front substrate and the back substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edge thereof.

As shown in FIG. 5, the plasma display apparatus 200 including the plasma display panel 100 according to an exemplary embodiment of the present invention includes the plasma display panel 100, the image processor 256, and the logic. The control unit 262 includes an address driver 223, an X driver 224, a Y driver 225, and an M driver 226. In FIG. 5, X electrodes 131, Y electrodes 132, and intermediate electrodes 113 forming a plurality of lines are illustrated.

Referring to the drawings, the Y electrodes 132 are spaced apart from each other to one side of the front substrate 111, and are connected to each other at the edge portion. When the plasma display panel 100 is driven, since the same electrical signal is applied to the Y electrodes 132, the Y electrodes 132 are electrically connected in common. Similarly to the Y electrodes 132, the X electrodes 131 are electrically connected in common because common signals are applied. However, since independent signals are applied to the intermediate electrodes 113, the intermediate electrodes 113 extend apart from each other and are connected to the intermediate electrode driver 226.

In the unit discharge cell 170, the positions and shapes of the electrodes 113, 122, 131, and 132 are substantially positioned in the intermediate electrode 113, the address electrode 122, and the X of FIGS. 2 and 3. It is the same as the electrode 131 and the Y electrode 132.

The image processing unit 256 converts an external analog image signal into a digital signal to convert an internal image signal, for example, 8 bits of red (R), green (G), and blue (B) image data, a clock signal, vertical and horizontal, respectively. Generate sync signals. The logic controller 262 controls the driving control signals S _A , S _X , and _A according to an internal image signal from the image processor 256. S _Y , S _M ) is generated.

5 and 6, reference numeral S _A denotes a drive signal applied to the address electrode 122, S _X denotes a drive signal applied to the X electrode 131, and S _Y denotes a drive applied to the Y electrode 132. The signal S _M indicates a drive signal applied to the intermediate electrode 113.

The address driver 223 may include driving control signals S _A , S _X , and _A from the logic controller 262. S _Y , The address driving signal S _A is processed in S _M to generate display data signals, and the generated display data signals are applied to the address electrodes 122. The X driver 224 may drive driving signals S _A , S _X , from the logic controller 262. S _Y , S _M) processes the X driving control signal _(X S) to be applied from the X electrode 131. In addition, the Y driver 225 may drive driving signals S _A , S _X , from the logic controller 262. S _Y , The S _M driving control signal S _Y is processed and applied to the Y electrodes 132, and the M driving unit 226 receives the driving control signals S _A , S _X , and S from the logic controller 262. S _Y , S _M) from among processes the M drive control signal (S _M) is applied to the intermediate electrode 113.

FIG. 6 is a waveform diagram of signals applied to electrodes 113, 122, 131, and 132 disposed in one discharge cells 170 of the plasma display panel 100 in a unit sub-field SF. Each of all unit frames is divided into eight subfields to realize time division gray scale display. In addition, each subfield SF is divided into a reset time R, an addressing time A, and a sustain-discharge time S. FIG.

Referring to FIG. 6, during the reset time R of the unit subfield SF, the discharge is generated while the rising lamp is applied to the intermediate electrode 113, and then the erasing discharge is generated while the falling lamp is applied. Reset discharge occurs in the entire panel 100, and the wall charge state of the entire discharge cells 170 is uniform. In detail, the ground voltage, which is the first voltage V _G , is applied to the address electrode 122 and the Y electrode 132. The voltage applied to the intermediate electrode 113 first rises to the second voltage V _SET + V _S and then decreases to the first voltage V _G. At this time, the first voltage V _G is first applied to the X electrode 131, and while the intermediate electrode 113 is reduced from the second voltage V _SET + V _S to the first voltage V _G , the first voltage V _G is applied. A sustain voltage of 3 voltages V _S is applied.

At each addressing time A, an intermediate electrode biased with the scan voltage V _SCAN lower than the third voltage V _S while the display data pulses of the address voltage V _A are applied to the address electrode 122. The scan pulse of the first voltage V _G is applied to 113. Accordingly, when high-level display data pulses are applied while the scan pulse is applied, wall charges are formed by the address discharge. Therefore, as a result of the address discharge, wall charges are accumulated on the X electrode 131, the intermediate electrode 113, and the Y electrode 132. However, since the display data pulse is not applied to the discharge cells for which address discharge is unnecessary, wall charges are not formed in the discharge cells.

At each sustain-discharge time S, sustain-discharge pulses are alternately applied to all the X electrodes 131 and the Y electrodes 132, so that sustain discharges are generated when wall charges are formed at the corresponding addressing time A. FIG. Cause In this case, the intermediate electrode 131 and the address electrode 122 are biased to the third voltage V _S and the first voltage V _G , respectively.

However, when the sustain-discharge is started, the first voltage V _G is applied to the X electrode 131 in which the negative wall charges are accumulated, and the third voltage in the intermediate electrode 113 in which the positive wall charges are accumulated. Since V _S ) is applied, the discharge starts between the X electrode 131 and the intermediate electrode 113 which are relatively close in distance. Therefore, since the discharge starts between the electrodes 113 and 131 disposed at a close distance, the discharge start voltage is reduced. After the discharge occurs between the X electrode 131 and the intermediate electrode 113, the discharge region is extended to the Y electrode 132, so that sustaining-discharge is actively performed between the X electrode 131 and the Y electrode 132. Occurs. At this time, while the first voltage V _G and the third voltage Vs are applied to the Y electrode 132 and the X electrode 131 alternately, a sustain discharge that displays a predetermined gray level during the sustain period is continuously generated to generate an image. Will be implemented. In particular, since the pressure is started between the X electrode 131 and the intermediate electrode 113, the distance between the X electrode 131 and the Y electrode 132 can be arranged far. In this case, since the discharge space has an effect of increasing, discharge is actively generated, and ultimately, the luminance is improved and the luminous efficiency is increased. As a result, due to the sustain-discharge between the X electrode 131, the intermediate electrode 113, and the Y electrode 132, the discharge start voltage is reduced, and the brightness and luminous efficiency are increased. Ultraviolet rays are emitted as the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 126 coated in the discharge cell 170. The energy level of the excited phosphor layer 126 is lowered, and visible light is emitted. The light is transmitted through the front substrate 111 to form an image that a user can recognize.

The plasma display panel according to the present invention has the following effects.

First, since the discharge starts between the intermediate electrode disposed between the X electrode and the Y electrode and the X electrode, the sustain discharge voltage is reduced. In addition, since the distance between the X electrode and the Y electrode can be arranged far, the discharge space is increased, the discharge occurs smoothly. Thus, the brightness and the luminous efficiency are improved.

Second, since the width of the partition wall portion disposed behind the intermediate electrode is relatively narrow, the area of the intermediate electrode participating in the discharge is increased. Thus, the address discharge voltage and the sustain voltage are reduced. In addition, since the area of the partition wall is reduced, the amount of space charge that collides with the partition wall and disappears is reduced, and discharge is actively generated, so that the brightness is 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 (5)

Back substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; Sustain electrode pairs disposed between the front substrate and the partition wall and extending across the discharge cells; Intermediate electrodes disposed between the pair of sustain electrodes; A first dielectric layer formed to cover the sustain electrode pairs and the intermediate electrodes; Address electrodes extending across the discharge cells to intersect the sustain electrode pair and the intermediate electrode in the discharge cell; A second dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And And a discharge gas in the discharge cell, The barrier rib includes horizontal barrier rib portions arranged in parallel to the sustain electrode pairs, and vertical barrier rib portions intersecting the horizontal barrier rib portions, and the widths of the portions arranged behind the intermediate electrodes in the vertical barrier rib portions are adjacent to each other. The plasma display panel is formed narrower than the width of the portions. delete The method of claim 1, And the vertical bulkheads have a symmetrical shape with respect to the longitudinal direction. The method of claim 1, And each of the sustain electrodes includes a bus electrode extending across the discharge cells, and a transparent electrode electrically connected to the bus electrode and extending parallel to the bus electrode. The method according to claim 1, 3 or 4, Each of the sustain electrode pairs includes an X electrode and a Y electrode, The X electrodes are electrically connected to each other such that the same control signal is applied between the X electrodes, and the Y electrodes are electrically connected to each other so that the same control signal is applied to the Y electrodes. Display panel.

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