KR100599620B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel having a terminal portion structure of display electrodes suitable for an integrated board for driving scan electrodes and sustain electrodes together.

A plasma display panel according to the present invention includes: a first substrate and a second substrate disposed to face each other; Address electrodes formed on the first substrate; Display electrodes including scan electrodes and sustain electrodes formed in a direction orthogonal to the address electrode on one surface of the second substrate; It includes a sealing material disposed between the first substrate and the second substrate to bond both substrates. The scan electrodes are led out to one edge of the second substrate to form scan electrode terminal portions on the non-display area, the sustain electrodes are electrically connected by connecting wires, and the at least one sustain electrode is in the same direction as the scan electrode terminal portions. It is drawn out to the edge to form the sustain electrode terminal portion. The connection wiring is formed over the inside and the outside of the sealing material.

Plasma, terminal, address electrode, display electrode, scan electrode, sustain electrode, display area, non-display area, heat radiation

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a plan view of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1.

3 is a plan view of a plasma display panel according to an embodiment of the present invention, in which a connection unit is installed.

4 is a partially exploded perspective view of the plasma display panel illustrated to explain an internal structure of the display area.

FIG. 5 is a partially enlarged cross-sectional view of the second substrate illustrated in FIG. 4.

6 is a view showing a drive waveform applicable to the plasma display panel of the present invention.

7 is a partial plan view of a plasma display panel showing another configuration example of the sustain electrode terminal portion.

8 and 9 are partial cross-sectional views of the plasma display panel shown for explaining the cross-sectional structure of the connection wiring, respectively.

10 is a plan view of a plasma display panel showing another configuration example of the connection wiring.

11 and 12 are partial cross-sectional views of the plasma display panel shown for explaining the structure of the heat radiating member, respectively.

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 improved terminal structure of scan electrodes and sustain electrodes.

In general, a plasma display panel (PDP) is a display device for realizing an image by exciting phosphors by vacuum ultraviolet rays generated by gas discharge in a discharge cell. The plasma display panel (PDP) is thin and has a high-resolution large screen configuration. Such PDPs are classified into a direct current type and an alternating current type according to the shape of the driving voltage waveform and the discharge cell structure. An AC PDP having a three-electrode surface discharge structure is widely used.

In the conventional general AC PDP, an address electrode, a partition, and a phosphor layer are formed on a rear substrate corresponding to each discharge cell, and a display electrode composed of a pair of scan electrodes and sustain electrodes along a direction orthogonal to the address electrodes on the front substrate. Is formed. The address electrode and the display electrode are covered with a dielectric layer, and the discharge cell is filled with discharge gas (mainly Ne-Xe mixed gas).

In general, in the AC PDP, one frame is divided into a plurality of subfields, and each subfield includes a reset period, an address period, and a sustain period.

The reset period is a period in which the state of each discharge cell is initialized so that the addressing operation can be performed smoothly in the discharge cell. The address period is configured to accumulate wall charges in the discharge cells that are turned on by selecting the discharge cells that are turned on and the discharge cells that are not turned on. The period of time to perform an operation. The sustain period is a period in which discharge for actually displaying an image is performed on the discharge cells to be turned on.

In order to perform such an operation, a sustain discharge pulse is applied to the scan electrode and the sustain electrode alternately in the sustain period, and the reset waveform and the scan waveform are applied to the scan electrode in the reset period and the address period. Therefore, a scan drive board for driving the scan electrode and a sustain drive board for driving the sustain electrode exist separately, and a connection structure for connecting the scan electrode and the scan drive board and the sustain electrode and the sustain drive board is separately required. do.

In a typical PDP, scan electrodes are drawn to one edge of the front substrate to form a scan electrode terminal portion, and a flexible printed circuit (FPC) is connected to the terminal portion to electrically connect the scan electrode and the scan drive board. The storage electrodes are led to the other edge of the front substrate to form the storage electrode terminal portion, and the flexible printed circuit is connected to the terminal portion to electrically connect the storage electrode and the sustain driving board.

As described above, in the conventional PDP, a separate scan drive board and a sustain drive board are installed in the chassis base, and a separate process is required to connect a flexible printed circuit to the scan electrode terminal part and the sustain electrode terminal part. There is a problem that the cost increases. In addition, the above-described PDP repeatedly displays a discharge in the discharge cell to display an image, and thus, a large amount of heat is generated during driving, and more heat is generated as the discharge intensity is increased to increase the brightness of the screen. .

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to provide an integrated board for driving a scan electrode and a sustain electrode together, and a terminal part structure of display electrodes suitable for the integrated board. To provide.

In order to achieve the above object, the present invention,

A display having first and second substrates disposed opposite to each other, address electrodes formed on the first substrate, and scan electrodes and sustain electrodes formed along a direction orthogonal to the address electrodes on one surface of the second substrate And a sealing material disposed between the electrodes and the first substrate and the second substrate to bond the two substrates, wherein the scan electrodes are drawn to one edge of the second substrate to form the scan electrode terminal portions on the non-display area, and hold it. The electrodes are electrically connected by connecting wirings, and at least one storage electrode is drawn out to the edge in the same direction as the scan electrode terminal portions to form the storage electrode terminal portions, and the connecting wirings are formed on the inside and outside of the sealing material. Provide a panel.

The scan electrode terminal portions and the sustain electrode terminal portion adjacent thereto are connected to a single connection unit. The display electrodes may be divided into at least two electrode groups arranged along the length direction of the address electrode, and may be connected to separate connection units for each electrode group.

The connection wiring may be formed of a stacked structure of a black electrode layer and a white electrode layer, or may be formed of a white electrode layer.

The plasma display panel may further include an extension part connected to the connection line to surround the outside of the long side edge of the display area inside the sealing material, and the extension may have a length at least surrounding the outside of the long side edge of the display area.

The plasma display panel may further include a heat dissipation member covering the connection line outside the sealing material, and the heat dissipation member may be formed of a silicon layer or a graphite layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are plan views of a plasma display panel according to an embodiment of the present invention, FIG. 4 is a partially exploded perspective view of the plasma display panel shown to explain the internal structure of the display area, and FIG. It is an expanded sectional view of the 2nd board | substrate shown.

First, the internal structure of the display area will be described with reference to FIGS. 4 and 5.

Referring to the drawing, in the plasma display panel PDP, the first substrate 2 and the second substrate 4 are disposed to face each other at random intervals, and discharge cells 6R, 6G, 6B) is provided to implement an arbitrary color image with visible light emission by the independent discharge mechanism of each discharge cell 6R, 6G, 6B.

Address electrodes 8 are formed on an inner surface of the first substrate 2 along one direction (y-axis direction in the drawing), and cover the address electrodes 8 to cover the first substrate 2. (10) is formed. The address electrodes 8 are formed in a stripe pattern, for example, and are arranged side by side with a predetermined distance from the neighboring address electrodes 8.

A partition wall 12, for example, a grid-shaped closed partition wall is formed on the first dielectric layer 10 to partition discharge cells 6R, 6G, and 6B, and four sides of the partition wall 12 and the first dielectric layer 10. Red, green, or blue phosphor layers 14R, 14G, 14B are positioned over the top surface. The shape of the partition wall 12 is not limited to the above-described structure, but may be formed of a closed structure other than stripe or lattice.

A pair of scan electrodes 16 and sustain electrodes 18 is formed on one surface of the second substrate 4 opposite to the first substrate 2 along a direction orthogonal to the address electrode 8 (x-axis direction in the drawing). The display electrodes 20 may be formed. The second dielectric layer 22 and the MgO passivation layer 24 may be disposed on the entirety of the second substrate 4 while covering the display electrodes 20.

The scan electrode 16 and the sustain electrode 18 are formed from the bus electrodes 16a and 18a and the bus electrodes 16a and 18a which are formed to correspond to a pair of outer portions of the discharge cells 6R, 6G and 6B. Each of the discharge cells 6R, 6G, and 6B may extend toward the inside and may include protruding electrodes 16b and 18b formed to face each other. The protruding electrodes 16b and 18b serve to cause plasma discharge in the discharge cells 6R, 6G and 6B, and are generally made of indium tin oxide (ITO). The bus electrodes 16a and 18a serve to apply a driving voltage to the protruding electrodes 16b and 18b, and have a stack structure of a black electrode layer 26 for securing contrast of a screen and a white electrode layer 28 having excellent conductivity. Can be done.

The first substrate 2 and the second substrate 4 described above are integrally bonded at edges by a sealing material 30 (see FIG. 1), such as a frit, and inside the discharge cells 6R, 6G, and 6B. The discharge gas (mainly Ne-Xe mixed gas) is filled in a sealed state to constitute a PDP.

The PDP includes a display area 100 (refer to FIG. 1) in which a substantial display in which discharge cells 6R, 6G, and 6B are located, and a non-display area 200 (FIG. 1) set along the periphery of the display area 100. Reference). The address electrodes 8 and the display electrodes 20 are drawn out to one side edges of the first substrate 2 and the second substrate 4, respectively, to form terminal portions on the non-display area 200. A connection unit 32 such as a flexible printed circuit (FPC) (see Fig. 3) is connected to receive the voltage required for driving the PDP. In the drawings, only the display electrode terminal parts and the connection unit connected thereto are shown for convenience.

Here, the PDP of this embodiment includes an integrated board (not shown) for driving the scan electrode 16 and the sustain electrode 18 together, and provides a terminal portion structure of the display electrode 20 suitable for this integrated board. In the realization of the integrated board, the reset waveform, the scan waveform, and the sustain discharge pulse are applied to the scan electrode 16 in the reset period, the address period, and the sustain period while the PDP of the present embodiment applies only a constant reference voltage to the sustain electrode 18. It can be based on the driving method.

A PDP driving waveform applicable to the present invention will be described with reference to FIG. 6. For convenience, the driving is applied to the scan electrode (hereinafter referred to as the 'Y electrode'), the sustain electrode (hereinafter referred to as the 'X electrode') and the address electrode (hereinafter referred to as the 'A electrode') constituting one discharge cell for convenience. Only waveforms will be described. In the illustrated driving waveform, the voltage applied to the Y electrode and the X electrode is supplied from the integrated board, and the voltage applied to the A electrode is supplied from the address buffer board. In this case, since the X electrode receives only the reference voltage (the ground voltage in FIG. 6), the description of the voltage applied to the X electrode is omitted.

Referring to FIG. 6, one subfield includes a reset period, an address period, and a sustain period, and the reset period includes a rising period and a falling period.

In the rising period of the reset period, the voltage of the Y electrode is gradually increased from the Vs voltage to the Vset voltage while the A electrode is maintained at the reference voltage (0 V in FIG. 6). In FIG. 6, the voltage of the Y electrode is increased in the form of a lamp. While the voltage of the Y electrode increases, a weak discharge occurs between the Y electrode and the X electrode and between the Y electrode and the A electrode, and a negative wall charge is formed on the Y electrode, and a positive wall on the X electrode and the A electrode. An electric charge is formed. In the reset period, since the state of all the discharge cells must be initialized, the voltage Vset is high enough to cause the discharge in all the discharge cells.

Then, in the falling period of the reset period, the voltage of the Y electrode is gradually decreased from the voltage of Vs to the voltage of Vfn. Then, a weak discharge occurs between the Y electrode and the X electrode and between the Y electrode and the A electrode, and the negative wall charges formed on the Y electrode and the positive wall charges formed on the X and A electrodes are erased. As a result, the wall voltage between the X electrode and the Y electrode becomes almost 0 V, whereby the discharge cells in which the address discharge has not occurred in the address period can be prevented from being erroneously discharged in the sustain period.

Next, in order to select the discharge cells to be turned on in the address period, a scan pulse having a VscL voltage and an address pulse having a Va voltage are applied to the Y electrode and the A electrode, respectively. The non-selected Y electrode biases the VscH voltage higher than the VscL voltage, and applies a reference voltage to the A electrode of the discharge cell that will not be turned on. Then, a discharge occurs between the A electrode and the Y electrode in the selected discharge cell, thereby forming positive wall charges on the Y electrode and negative wall charges on the A electrode and the X electrode, respectively. As a result, the wall voltage Vwxy is formed between the Y electrode and the X electrode such that the potential of the Y electrode is high with respect to the potential of the X electrode.

Subsequently, in the sustain period, a pulse having a voltage of Vs is first applied to the Y electrode to the discharge cell in which the address discharge has occurred, thereby causing sustain discharge between the Y electrode and the X electrode. At this time, the voltage Vs is set to be lower than the discharge start voltage Vfxy between the Y electrode and the X electrode, and the voltage (Vs + Vwxy) is lower than the voltage Vfxy. As a result of the sustain discharge, negative wall charges are formed on the Y electrode, positive wall charges are formed on the X electrode and the A electrode, respectively, and the wall voltage Vfyx of the X electrode with respect to the Y electrode is formed at a high voltage. .

Subsequently, a pulse having a voltage of -Vs is applied to the Y electrode to generate sustain discharge between the Y electrode and the X electrode. As a result, positive wall charges are formed on the Y electrode, negative wall charges are formed on the X electrode and the A electrode, respectively, so that a sustain discharge can occur when the Vs voltage is applied to the Y electrode. Thereafter, the process of applying the sustain discharge pulse of the Vs voltage and the process of applying the sustain discharge pulse of the -Vs voltage to the scan electrode is repeated a number of times corresponding to the weight indicated by the corresponding subfield.

As such, the PDP of the present embodiment may include an integrated board for driving the scan electrode 16 and the sustain electrode 18 together based on the above-described driving waveform.

Next, the structure of the terminal portion of the scan electrode 16 and the sustain electrode 18 suitable for the integrated board will be described.

1 to 3, the scan electrodes 16 are led out to one side edge of the second substrate 4 (for example, the left edge based on the drawing) to scan electrode terminal portions on the non-display area 200. (16c) is formed. The storage electrodes 18 are electrically connected to each other by the connection wire 34, and any one of the storage electrodes 18 is led out to the edge in the same direction as the scan electrode terminal portions 16c, so that the storage electrode terminal portions 18c may be separated. Form. In particular, the display electrodes 20 may be separated into at least two electrode groups 36 arranged along the length direction (y-axis direction of the drawing) of the address electrode, and the scan electrodes (described above) for each electrode group 36 may be separated. 16, scan electrode terminal portions 16c, sustain electrode 18, and sustain electrode terminal portions 18c.

In each of the electrode groups 36, the sustain electrodes 18 extend in the non-display area 200 toward the other side edge of the second substrate 4 (for example, the right edge of the drawing). On the non-display area 200, a connection line 34 is formed along a direction orthogonal to the storage electrodes 18 so as to be connected to ends of the storage electrodes 18.

The sustain electrode terminal portion 18c is any one of two sustain electrodes 18 positioned at the outermost side of the sustain electrodes 18 in the plurality of sustain electrodes 18 constituting one electrode group 36. It may be extended from the sustain electrode of (for example, one sustain electrode which is located at the outermost of the sustain electrodes in Figure 2). In addition, the sustain electrode terminal unit 18c may extend from one sustain electrode 18 positioned at the outermost part of the electrode group 36.

On the other hand, as shown in Fig. 7, the sustain electrode terminal portion 18c includes two sustain electrodes positioned at the outermost sides of the sustain electrodes 18 in the plurality of sustain electrodes 18 constituting one electrode group. It may extend from the electrode 18.

The position of the sustain electrode 18 in which one end thereof is drawn out in one electrode group 36 to form the sustain electrode terminal portion 18c is not limited to the examples described above.

The display electrodes 20 having the terminal structure described above are connected to a single connection unit 32 for each electrode group 36 and connected to the integrated board. That is, scan electrode terminal portions 16c extending from scan electrodes 16 in one electrode group 36 and sustain electrode terminal portions 18c extending from at least one sustain electrode 18 have a common connection unit 32. Is connected to the integrated board. As a result, the PDP of the present embodiment can reduce the number of connection units 32, so that the number of manufacturing steps is reduced and manufacturing costs are reduced.

At this time, the scan electrode terminal portions 16c connected to one connection unit 32 have an electrode pitch that is reduced through an oblique portion to have an electrode pitch smaller than that of the display region 100.

In addition, in the present embodiment, a part of the connection wiring 34 is drawn out of the sealing material 30 to have a structure that is advantageous for PDP heat dissipation. The connection wire 34 is formed to have a width large enough to cover the inside of the sealing material 30 and the outside of the sealing material 30, and serves to discharge heat generated inside the PDP to the outside of the sealing material.

The connection wire 34 may have a structure in which the black electrode layer and the white electrode layer are stacked in the same manner as the bus electrode 16a of the sustain electrode 18 described above, or may be formed of only the white electrode layer without the black electrode layer. FIG. 8 illustrates a case in which the connection wiring 34 is a laminated structure of the black electrode layer 26 and the white electrode layer 28, and FIG. 9 illustrates a case in which the connection wiring 34 ′ includes only the white electrode layer 28. .

Meanwhile, as shown in FIG. 10, the sustain electrodes 18 may be formed to have a larger surface area inside the sealing material 30 to more efficiently dissipate heat generated inside the PDP.

To this end, the two electrode groups 36 positioned at the outermost sides of the display area 100 are formed to surround the outer side edges of the long side of the display area 100 in the sealing material 30 while being connected to the connection wire 34. And an extension 38. The extension 38 is formed to have at least the same length as the long side edge of the display area 100 and to have a width larger than that of the sustain electrode 18. The connection wire 34 and the extension part 38 may be formed of a white electrode layer.

In addition, the present embodiment provides a structure in which the heat dissipation member is formed on the connection wires 34 drawn out of the sealing material 30 to double the heat radiation efficiency of the connection wires 34. The heat dissipation member may consist of the silicon layer 40 shown in FIG. 11 or the graphite layer 42 shown in FIG. The silicon layer 40 is applied with a sufficient thickness along one side edge of the second substrate 4 from which the connection wire 34 is drawn out of the sealing material 30, and the silicon layer 40 is applied to the connection wire 34. Along with the role of increasing the heat dissipation efficiency, it also serves to enhance the airtightness of the PDP by enclosing the sealing material 30 outside.

The heat dissipation member is not limited to the silicon layer 40 and the graphite layer 42 described above, and is applied to the heat dissipation member as long as it is a material layer that increases the heat dissipation efficiency of the connection wiring 34 without degrading the functionality of the connection wiring 34. It is possible.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, the plasma display panel according to the present invention connects the scan electrode terminal portions and the sustain electrode terminal portions in one electrode group at one edge of the second substrate to a common connection unit and connects them to the integrated board. Accordingly, the plasma display panel of the present invention can reduce the number of connection units, thereby reducing the number of manufacturing steps and reducing the manufacturing cost. In addition, the plasma display panel of the present invention has the effect that the heat dissipation efficiency is improved by emitting heat inside the panel to the outside through the connection wiring.

Claims (13)

First and second substrates disposed opposite to each other and having a display area and a non-display area set along the periphery of the display area; Address electrodes formed on the first substrate; A partition wall disposed in a space between the first substrate and the second substrate on the display area to partition discharge cells; Display electrodes including scan electrodes and sustain electrodes formed on one surface of the second substrate in a direction orthogonal to the address electrode; And A sealing material disposed between the first substrate and the second substrate to bond both substrates, The scan electrodes are led to one edge of the second substrate to form scan electrode terminal portions on the non-display area, and the sustain electrodes are electrically connected by connection wires, and at least one sustain electrode is connected to the scan electrode terminal portions. Is drawn out to the edge of the same direction to form the sustain electrode terminal portion, And the connection wiring is formed on the inside and the outside of the sealing material. The method of claim 1, And the scan electrode terminal portions and the sustain electrode terminal portions adjacent thereto are connected to a single connection unit. The method of claim 1, And the display electrodes are separated into at least two electrode groups arranged along the longitudinal direction of the address electrode, and connected to a separate connection unit for each electrode group. The method of claim 3, And at least one sustain electrode of the two sustain electrodes positioned at the outermost sides of the sustain electrodes in the one electrode group is drawn to one edge of the second substrate to form the sustain electrode terminal portion. The method according to claim 2 or 3, The connection wires are formed along a length direction of the address electrode while having a width that extends from the inside and the outside of the sealing material on a non-display area adjacent to the other edge of the second substrate, and the ends of the sustain electrodes face the connection wires. A plasma display panel that extends to connect with the connection wiring. The method of claim 5, The plasma display panel, wherein the connection wiring has a laminated structure of a black electrode layer and a white electrode layer. The method of claim 5, And the connecting wiring is formed of a white electrode layer. The method of claim 5, And an extension part connected to the connection line and surrounding an outer edge of the long side of the display area inside the sealing material. The method of claim 8, And the extension portion has a length surrounding at least an outer edge of a long side of the display area. The method of claim 8, And a connecting portion and an extension portion formed of a white electrode layer. The method according to claim 2 or 3, And a heat dissipation member covering the connection wiring outside the sealing material. The method of claim 11, And a heat dissipation member comprising a silicon layer. The method of claim 11, And a heat dissipation member comprising a graphite layer.

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