KR20080062325A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to lower a firing voltage between a scan electrode and a sustain electrode by arranging the scan electrode and the sustain electrode so that they face an address electrode in a parallel direction within a discharge cell. A scan electrode(102) and a sustain electrode(103) are arranged in parallel on a front substrate(101). An address electrode(113) intersected with the scan electrode and the sustain electrode, is arranged on a rear substrate(111). A barrier rib(112) divides discharge cells between the front substrate and the rear substrate. The scan electrode faces the sustain electrode in parallel with a progress direction of the address electrode in the discharge cell. The barrier rib includes a horizontal barrier rib(112b) and a vertical barrier rib(112a). The horizontal barrier rib is in parallel with the scan electrode and the sustain electrode. The vertical barrier rib is intersected with the horizontal barrier rib. The scan electrode and the sustain electrode include horizontal parts, which are in parallel with the horizontal barrier rib, and vertical parts, which are in parallel with the vertical barrier rib. The vertical part of the scan electrode faces the vertical part of the sustain electrode in the discharge cell.

Description

Plasma Display Panel

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

2 is a view for explaining the scan electrode and the sustain electrode in more detail.

3 is a view for explaining an example where the bus electrode includes a protrusion.

4 is a diagram for explaining an arrangement of address electrodes.

5 is a view for explaining an example of a structure in which two sustain electrodes are merged into one;

FIG. 6 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an embodiment of the present invention. FIG.

7 is a view for explaining an example of an operation of a plasma display panel according to an embodiment of the present invention in a subfield included in an image frame;

<Explanation of symbols for the main parts of the drawings>

101: front substrate 102: scan electrode

103: sustain electrode 104: upper dielectric layer

105: protective layer 111: back substrate

112: partition 113: address electrode

114: phosphor layer 115: lower dielectric layer

112a: vertical bulkhead 112b: horizontal bulkhead

The present invention relates to a plasma display panel.

In general, a phosphor layer is formed in a discharge cell (Cell) partitioned by a partition, and a plurality of electrodes are formed in the plasma display panel.

The driving signal is supplied to the discharge cell through the electrode.

Then, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

One embodiment of the present invention is to provide a plasma display panel that improves driving efficiency by lowering a discharge voltage between a scan electrode and a sustain electrode.

According to an embodiment of the present invention, a plasma display panel includes a front substrate on which scan electrodes and a sustain electrode are arranged in parallel with each other, a rear substrate on which an address electrode intersecting the scan electrode and the sustain electrode is disposed, and a discharge between the front substrate and the rear substrate. And a partition wall that partitions the cell, wherein the scan electrode and the sustain electrode face each other in a direction parallel to the advancing direction of the address electrode in the discharge cell.

Further, the partition wall includes a horizontal partition wall parallel with the scan electrode and the sustain electrode, and a vertical partition wall intersecting the horizontal partition wall, and the scan electrode and the sustain electrode include a horizontal part parallel with the horizontal partition wall and a vertical part parallel with the vertical partition wall, and scan The vertical part of the electrode and the vertical part of the sustain electrode face each other in the discharge cell.

In addition, the vertical portion overlaps the vertical partition wall.

In addition, the vertical portion includes a transparent electrode and a bus electrode, and the length of the transparent electrode is longer than the length of the bus electrode.

In addition, the bus electrode includes a protrusion protruding toward the center of the discharge cell.

Further, the length of the bus electrode is 0.2 or more and 0.8 or less of the length of the discharge cell in the advancing direction of the address electrode.

The interval between the scan electrode and the sustain electrode is 0.1 to 0.6 times the width of the discharge cell in the direction crossing the address electrode.

Hereinafter, a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 1, the plasma display panel according to the exemplary embodiment of the present invention is disposed to face the front substrate 101 and the front substrate 101 on which the scan electrode 102 and the sustain electrode 103 are arranged in parallel with each other. The back substrate 111 on which the address electrode 113 intersecting the scan electrode 102 and the sustain electrode 103 is disposed is bonded to each other.

Although not illustrated in FIG. 1, the scan electrode 102 and the sustain electrode 103 may each include a transparent electrode and a bus electrode.

The transparent electrode may include a transparent material such as indium tin oxide (ITO).

The bus electrode may include a metal material having excellent electrical conductivity such as silver (Ag).

Alternatively, the scan electrode 102 and the sustain electrode 103 may have a single layer structure. For example, the scan electrode 102 and the sustain electrode 103 may be an electrode in which the above-mentioned transparent electrode is omitted, for example, an ITO-Less electrode.

In addition, although not shown in FIG. 1, a black layer having a color darker than that of the scan electrode 102 and the sustain electrode 103 between the front substrate 101 and the scan electrode 102 and the sustain electrode 103. It is also possible to be arranged. For example, when the scan electrode 102 and the sustain electrode 103 each include a transparent electrode and a bus electrode, between the transparent electrode and the bus electrode of the scan electrode 102 and the transparent electrode of the sustain electrode 103 and Black layers may be disposed between the bus electrodes, respectively.

The scan electrode 102 and the sustain electrode 103 will be described in more detail later.

A dielectric layer covering the scan electrode 102 and the sustain electrode 103 may be disposed on the front substrate 101 on which the scan electrode 102 and the sustain electrode 103 are disposed, for example, the upper dielectric layer 104. .

The upper dielectric layer 104 limits the discharge current of the scan electrode 102 and the sustain electrode 103 and can insulate between the scan electrodes 102 and Y and the sustain electrodes 103 and Z.

A protective layer 105 may be disposed on the upper surface of the upper dielectric layer 104 to facilitate a discharge condition. The protective layer 105 may include a material having a high secondary electron emission coefficient, such as magnesium oxide (MgO).

An electrode, for example, an address electrode 113 is disposed on the rear substrate 111, and a dielectric layer covering the address electrode 113, for example, a lower dielectric layer 115 is disposed on the rear substrate 111 on which the address electrode 113 is disposed. This can be arranged.

The lower dielectric layer 115 may insulate the address electrode 113.

In addition, a partition 112 having a discharge space, that is, a stripe type, a well type, a delta type, a honeycomb type, and the like, which partitions a discharge cell, is formed on an upper portion of the lower dielectric layer 115. Can be arranged. Accordingly, red (R), green (G), and blue (B) discharge cells may be provided between the front substrate 101 and the rear substrate 111.

In addition, in addition to the red (R), green (G), and blue (B) discharge cells, a white (W) or yellow (Y) discharge cell may be further provided.

Although the widths of the red (R), green (G), and blue (B) discharge cells in the plasma display panel according to the embodiment of the present invention may be substantially the same, the red (R), green (G), and blue colors may be substantially the same. (B) The width of at least one of the discharge cells may be different from that of the other discharge cells.

For example, the width of the red (R) discharge cell is the smallest, and the width of the green (G) and blue (B) discharge cells can be made larger than the width of the red (R) discharge cell. Here, the width of the green (G) discharge cell may be substantially the same as or different from the width of the blue (B) discharge cell.

The width of the phosphor layer 114, which will be described later, disposed in the discharge cell is then changed in relation to the width of the discharge cell. For example, the width of the blue (B) phosphor layer disposed in the blue (B) discharge cell is wider than the width of the red (R) phosphor layer disposed in the red (R) discharge cell, and at the same time in the green (G) discharge cell. The width of the green (G) phosphor layer disposed may be wider than the width of the red (R) phosphor layer disposed in the red (R) discharge cell.

Then, color temperature characteristics of the image to be implemented may be improved.

In addition, the plasma display panel according to the exemplary embodiment of the present invention may have not only the structure of the partition wall 112 shown in FIG. 1 but also the structure of the partition wall having various shapes. For example, the partition wall 112 may include a horizontal partition wall 112b and a vertical partition wall 112a, where a differential partition wall structure in which the height of the horizontal partition wall 112b and the height of the vertical partition wall 112a are different from each other may be possible. .

In the case of such a differential partition structure, the height of the horizontal partition wall 112b among the horizontal partition wall 112b or the vertical partition wall 112a may be lower than the height of the vertical partition wall 112a.

In FIG. 1, red (R), green (G), and blue (B) discharge cells are shown and described as being arranged on the same line, but may be arranged in other shapes. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal, as well as rectangular.

In addition, in FIG. 1, only the case where the partition wall 112 is formed on the rear substrate 111 is illustrated, but the partition wall 112 may be disposed on at least one of the front substrate 101 and the rear substrate 111.

Here, a predetermined discharge gas is filled in the discharge cell partitioned by the partition wall 112. For example, gases such as argon (Ar), neon (Ne), and xenon (Xe) are filled as discharge gas.

In addition, a phosphor layer 114 that emits visible light for image display may be disposed in the discharge cell partitioned by the partition wall 112. For example, red (R), green (G), and blue (B) phosphor layers may be disposed.

In addition to the red (R), green (G), and blue (B) phosphors, a white (W) and / or yellow (Y) phosphor layer may be further disposed.

In addition, the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) discharge cells may be different from other discharge cells. For example, the thickness of the phosphor layer of the green (G) discharge cell, that is, the phosphor layer of the green (G) phosphor layer or the blue (B) discharge cell, that is, the blue (B) phosphor layer, is red (R) discharge cell. It may be thicker than the thickness of the phosphor layer in, ie the red (R) phosphor layer. Here, the thickness of the green (G) phosphor layer may be substantially the same as or different from the thickness of the blue (B) phosphor layer.

In the above description, only one example of the plasma display panel according to an exemplary embodiment of the present invention is illustrated and described. Therefore, the present invention is not limited to the plasma display panel having the above-described structure. For example, the above description shows only the case where the upper dielectric layer number 104 and the lower dielectric layer number 115 are each one layer, but one or more of the upper dielectric layer or the lower dielectric layer is a plurality of layers. It is also possible to make.

In addition, although the width or thickness of the address electrode 113 disposed on the rear substrate 111 may be substantially constant, the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. . For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

Next, FIG. 2 is a diagram for explaining the scan electrode and the sustain electrode in more detail.

Referring to FIG. 2, the scan electrode 102 and the sustain electrode 103 are disposed to face each other in parallel with the address electrode 113 in a discharge cell partitioned by the partition wall 112.

The scan electrode 102 and the sustain electrode 103 are horizontal portions 102-1 and 103-1 parallel to the horizontal partition wall 112b among the partition walls 112, and a vertical portion 102-parallel to the vertical partition wall 112a. 2, 103-2). Here, the vertical portion 102-2 of the scan electrode 102 and the vertical portion 103-2 of the sustain electrode 103 are preferably disposed to face each other in the discharge cell.

In the discharge cell partitioned by the partition wall 112, the length L3 in the direction parallel to the address electrode 113 is relatively long by the width W1 in the direction crossing the address electrode 113.

Accordingly, when the scan electrode 102 and the sustain electrode 103 face each other in the direction parallel to the address electrode 113 in the discharge cell, the length of the surface where the scan electrode 102 and the sustain electrode 103 face each other. Can be increased.

Then, a sufficient amount of wall charge may accumulate between the scan electrode 102 and the sustain electrode 103 during driving, and thus, the discharge start voltage between the scan electrode 102 and the sustain electrode 103 may be fixed. The driving efficiency is improved by lowering the voltage.

When the distance W2 between the scan electrode 102 and the sustain electrode 103 is excessively large, the discharge start voltage between the scan electrode 102 and the sustain electrode 103 may be excessively high, while the scan electrode ( If the distance W2 between the 102 and the sustain electrode 103 is excessively small, it becomes difficult to control the discharge generated between the scan electrode 102 and the sustain electrode 103, and at the same time, the scan electrode is caused by a process error. The possibility that the 102 and the sustain electrode 103 are electrically connected increases.

Accordingly, the interval W2 between the scan electrode 102 and the sustain electrode 103 is preferably 0.1 to 0.6 times the width W1 in the direction crossing the address electrode 113 of the discharge cell.

The vertical portions 102-2 and 103-2 of the scan electrode 102 and the sustain electrode 103 preferably include the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b. In addition, it is preferable that the vertical portions 102-2 and 103-2 of the scan electrode 102 and the sustain electrode 103 overlap the vertical partition wall 112a, more preferably the scan electrode 102 and the sustain electrode 103. It is preferable that the bus electrodes 102b and 103b of 103 overlap the vertical partition 112a.

Here, considering that the bus electrodes 102b and 103b are substantially opaque and the transparent electrodes 102a and 103a are substantially transparent, the length L1 of the bus electrodes 102b and 103b is transparent in order to sufficiently secure the aperture ratio. It is preferable to be shorter than the length L2 of the electrodes 102a and 103a.

In addition, when the length L1 of the bus electrodes 102b and 103b is excessively long, the aperture ratio may decrease, so that the luminance of an image may be reduced, whereas the length L1 of the bus electrodes 102b and 103b may be reduced. In an excessively short case, an electric resistance value of the scan electrode 102 and the sustain electrode 103 may be excessively increased, thereby reducing driving efficiency. Accordingly, the length L1 of the bus electrodes 102b and 103b is preferably 0.2 or more and 0.8 or less than the length L3 of the discharge cell in the advancing direction of the address electrode 113.

Next, FIG. 3 is a figure for explaining an example in the case where a bus electrode contains a protrusion part.

Referring to FIG. 3, the bus electrodes 102b and 103b include protrusions 300 and 301 protruding toward the discharge cell center direction.

As such, when the bus electrodes 102b and 103b include protrusions 300 and 301 protruding toward the center of the discharge cell, the protrusions 300 of the scan electrode 102 and the protrusions of the sustain electrode 103 during driving are performed. The probability that the wall charges are distributed between the 301s is increased, and accordingly, the discharge start voltage between the scan electrode 102 and the sustain electrode 103 is further lowered, thereby improving driving efficiency.

3 illustrates only the case in which the scan electrode 102 includes one protrusion 300 and the sustain electrode 103 includes one protrusion 301, but the scan electrode 102 or the sustain electrode ( At least one of the 103 may also include two or more protrusions.

4 is a diagram for explaining the arrangement of the address electrodes.

Referring to FIG. 4, the address electrode 113 may be disposed in a direction in which the scan electrode 102 is disposed in the discharge cell.

As shown in FIG. 7 to be described later, the data signal is supplied to the address electrode 113 in the address period of the subfield, and the scan signal is supplied to the scan electrode 102 to provide the scan electrode 102 and the address electrode 113. An address discharge occurs between them. Therefore, when the address electrode 113 is disposed in a direction in which the scan electrode 102 is disposed in the discharge cell, the efficiency of the address discharge can be improved.

Next, FIG. 5 is a view for explaining an example of a structure in which two sustain electrodes are merged into one.

Referring to FIG. 5, when the scan electrode 102 and the sustain electrode 103 are arranged in the order of the scan electrode 102, the scan electrode 102, the sustain electrode 103, and the sustain electrode 103, the scan electrodes 102 and the sustain electrode 103 are disposed in succession. The two sustain electrodes 103 may be merged into one.

As such, the reason why the two consecutive sustain electrodes 103 are merged into one is that the same driving signal may be supplied to all the sustain electrodes 103 in the active area as shown in FIG. 7 to be described later.

In addition, when the bus electrodes 102b and 103b of the scan electrode 102 and the sustain electrode 103 include the protrusions 500, 501 and 502, the bus electrode 103b of the one sustain electrode 103 protrudes. Preferably, two protrusions 501 and 502 having opposite directions are included together.

Next, FIG. 6 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 6, an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention may be divided into a plurality of subfields having different emission counts.

Although not shown, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing discharge cells, an address period for selecting discharge cells to be discharged, and the number of discharges. It can be divided into the sustain period to implement.

For example, in the case where it is desired to display an image with 256 gray levels, for example, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 6, and each of the eight subfields SF1 to SF8. Can be subdivided into a reset period, an address period and a sustain period.

The gray scale weight of the corresponding subfield may be set by adjusting the number of the sustain signals supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As described above, the number of sustain signals supplied in the sustain period of each subfield is adjusted according to the gray scale weight in each subfield, thereby implementing gray levels of various images.

A plasma display panel according to an embodiment of the present invention uses a plurality of image frames to implement an image, for example, to display an image of 1 second. For example, 60 image frames are used to display an image of 1 second. In this case, the length T of one image frame may be 1/60 second, that is, 16.67 ms.

In FIG. 6, only one image frame is composed of eight subfields. However, the number of subfields constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

In addition, in FIG. 6, subfields are arranged in the order of increasing magnitude of gray scale weight in one image frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one image frame. Alternatively, subfields may be arranged regardless of the gray scale weight.

Next, FIG. 7 illustrates an example of an operation of a plasma display panel according to an exemplary embodiment of the present invention in a subfield included in an image frame.

Referring to FIG. 7, in the set-up period of the reset period for initialization, the scan electrode rapidly rises from the first voltage V1 to the second voltage V2 and then from the second voltage V2 to the third voltage ( A ramp-up signal is supplied in which the voltage gradually rises up to V3). Here, the first voltage V1 may be a voltage of the ground level GND.

In this setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

In a set-down period after the setup period, a ramp-down signal in the opposite polarity direction is supplied to the scan electrode after the ramp lamp signal.

Here, the falling ramp signal may gradually fall from the peak voltage of the rising ramp signal, that is, the fourth voltage V4 to the fifth voltage V5 lower than the third voltage V3.

As the falling ramp signal is supplied, a weak erase discharge, that is, a setdown discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated in the discharge cells remain uniformly.

In the address period after the reset period, a scan bias signal that substantially maintains the lowest voltage of the falling ramp signal, that is, a voltage higher than the fifth voltage V5, for example, the sixth voltage V6, is supplied to the scan electrode.

In addition, a scan signal having a magnitude of Vy from the scan bias signal may be supplied to the scan electrode.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal in at least one subfield may be different from the width of the scan signal in another subfield. For example, the width of the scan signal in the subfield located later in time may be smaller than the width of the scan signal in the preceding subfield. In addition, the reduction of the scan signal width according to the arrangement order of the subfields may be made gradually, such as 2.6 Hz (microseconds), 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz. .... 1.9 ㎲, 1.9 ㎲ and so on.

As such, when the scan signal is supplied to the scan electrode, a data signal having a magnitude of Vd may be supplied to the address electrode corresponding to the scan signal.

As the scan signal and the data signal are supplied, an address discharge may be generated in the discharge cell to which the data signal is supplied while the voltage difference between the scan signal and the data signal and the wall voltage caused by the wall charges generated in the reset period are added. have.

Here, the sustain bias signal may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode in the address period.

Here, the sustain bias signal may maintain a substantially constant sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and greater than the voltage of the ground level GND.

Subsequently, in the sustain period for displaying an image, a sustain signal may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal, and a sustain discharge, i.e., display between the scan electrode and the sustain electrode when the sustain signal is supplied. Discharge may occur. Then, an image may be displayed on the screen of the plasma display panel.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the foregoing description, and the meaning and scope of the claims. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Plasma display panel according to an embodiment of the present invention is arranged so that the scan electrode and the sustain electrode to face in parallel with the address electrode in the discharge cell to lower the discharge start voltage between the scan electrode and the sustain electrode to improve the driving efficiency There is.

Claims (7)

A front substrate on which scan electrodes and sustain electrodes parallel to each other are disposed; A rear substrate on which an address electrode intersects the scan electrode and the sustain electrode; And Barrier ribs defining a discharge cell between the front substrate and the rear substrate; Including, And the scan electrode and the sustain electrode face each other in a direction parallel to a traveling direction of the address electrode in the discharge cell. The method of claim 1, The partition wall includes a horizontal partition wall parallel to the scan electrode and the sustain electrode, and a vertical partition wall intersecting the horizontal partition wall, The scan electrode and the sustain electrode include a horizontal portion parallel to the horizontal partition wall and a vertical portion parallel to the vertical partition wall, And a vertical portion of the scan electrode and a vertical portion of the sustain electrode face each other in a discharge cell. The method of claim 2, And the vertical portion overlapping the vertical partition wall. The method of claim 2, The vertical portion includes a transparent electrode and a bus electrode, wherein the length of the transparent electrode is longer than the length of the bus electrode. The method of claim 4, wherein And the bus electrode includes a protrusion protruding toward the center of the discharge cell. The method of claim 4, wherein And the bus electrode has a length of 0.2 times or more and 0.8 times or less of a length of the discharge cell in the advancing direction of the address electrode. The method of claim 1, And a gap between the scan electrode and the sustain electrode is 0.1 to 0.6 times the width of the discharge cell in the direction crossing the address electrode.

Images