KR100627423B1 - Plasma display and driving method thereof - Google Patents

Abstract

In the plasma display device, the discharge delay of the discharge cells located in the region far from the exhaust port is large in the address period, so that the sustain electrode when a scan pulse is applied to the scan electrodes of the discharge cells located in the region far from the exhaust port formed in the plasma display panel. The voltage applied to is higher than the voltage applied to the sustain electrode when the scan pulse is applied to the scan electrode of the discharge cell located close to the exhaust port. In this way, the address discharge can be easily generated even in the discharge cells located in the region far from the exhaust port.

PDP, electrode, discharge, address period, discharge delay, exhaust port

Description

Plasma display device and driving method thereof {PLASMA DISPLAY AND DRIVING METHOD THEREOF}

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

FIG. 2 is a perspective view of the plasma display panel 100 shown in FIG. 1 seen from the rear side.

3 is a cross-sectional view taken along line II ′ of FIG. 2.

4 illustrates a driving waveform of the plasma display device according to an exemplary embodiment of the present invention.

The present invention relates to a plasma display device and a driving method thereof.

The plasma display device is a display device using a plasma display panel that displays text or an image by using plasma generated by gas discharge. In the plasma display panel, dozens to millions or more of discharge cells are arranged in a matrix form according to their size.

In the plasma display device, one field (1TV field) is divided and driven into a plurality of subfields having respective weights, and gray scales are displayed by a combination of weights of subfields in which a display operation occurs among a plurality of subfields. In the address period of each subfield, discharge cells to emit light and discharge cells not to emit light are selected by the address discharge, and the discharge cells to emit light selected in the sustain period are sustained and discharged for a period corresponding to the weight of the subfield to display an image. do.

In particular, in the address period, in order to select discharge cells to emit light, scan pulses are sequentially applied to the plurality of scan electrodes, and address pulses are applied to the address electrodes of the discharge cells to emit light. At this time, an address discharge occurs in a discharge cell to which a scan pulse and an address pulse are simultaneously applied, and a discharge cell to emit light is selected. As described above, since addressing operations are sequentially performed on all discharge cells in the address period, address discharge may not occur well in the discharge cells that are addressed later due to lack of priming particles in the discharge cells.

On the other hand, the plasma display device is in close contact with the scan substrate for performing a display operation for displaying an image, the front substrate provided with the sustain electrode and the back substrate provided with the address electrode, and then the temperature is increased to bond and activate and cool MgO. It is prepared by injecting a discharge gas after passing through and removing impurities therein. However, due to the surface roughness of the plasma display panel, the discharge gas mobility in the fluorescent layer material, the amount of water adsorbed or chemically bonded to the MgO surface, the amount of residual binder remaining in the fluorescent layer, the internal surface area, etc. Since the cells are not in the same state, all cells do not exhaust impurities in the process of removing impurities therein. In particular, in the case of a discharge cell far from the exhaust port, impurities are not sufficiently exhausted. As such, the discharge cells in which impurities are not sufficiently discharged may have a large discharge delay, and thus, even if the priming particles are sufficiently present in the second half of the address period, the address discharge may not occur.

An object of the present invention is to provide a plasma display device and a driving method thereof capable of performing stable address discharge.

According to an aspect of the present invention, a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode and the first electrode, the second electrode And a plurality of subfields, each of which is driven in a plasma display device including a plurality of discharge cells defined by the third electrodes. The driving method includes applying a second voltage to a second group of electrodes in a state in which a first voltage is applied to the plurality of first electrodes in an address period, and applying the second voltage to the plurality of first electrodes. And applying the second voltage to the second electrode of the second group while applying a third voltage higher than one voltage. At this time, the discharge delay between any one of the second electrode and the third electrode of the second group of the second group, between the second electrode and the third electrode of any one of the second electrode of the first group Greater than the discharge delay.

According to another feature of the present invention, a plurality of scan electrodes and a plurality of sustain electrodes, a plurality of address electrodes formed in a direction crossing the scan electrode and the sustain electrode and the scan electrode, the sustain electrode and the address electrode A plasma display panel including a plurality of discharge cells, each of which is defined by < RTI ID = 0.0 > and a < / RTI > A plasma display device including a driver for applying a pulse is braked. In this case, the discharge delay between the first scan electrode and the address electrode is greater than the discharge delay between the second scan electrode and the address electrode, and the driving unit has a scan pulse applied to the first scan electrode among the plurality of scan electrodes. The first voltage when applied is higher than the first voltage when the scan pulse is applied to a second scan electrode of the plurality of scan electrodes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the wall charge in the present invention refers to a charge formed close to each electrode on the wall (eg, the dielectric layer) of the cell. And the wall charge is not actually in contact with the electrode itself, but is described here as “formed”, “accumulated” or “stacked” on the electrode. In addition, the wall voltage refers to the potential difference formed in the wall of the cell by the wall charge.

First, a plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500. It includes.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as “A electrodes”) A1 to Am extending in the column direction, and a plurality of sustain electrodes extending in pairs to each other in the row direction (hereinafter, “X”). Electrodes ”(X1 to Xn) and scan electrodes (hereinafter referred to as“ Y electrodes ”) (Y1 to Yn). In general, the X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and the display for displaying images in the sustain period between the X electrodes X1 to Xn and the Y electrodes Y1 to Yn. Perform the action. The Y electrodes Y1 to Yn and the X electrodes X1 to Xn are arranged to be orthogonal to the A electrodes A1 to Am. At this time, the discharge space at the intersection of the A electrodes A1 to Am and the X and Y electrodes X1 to Xn and Y1 to Yn forms the cell 12. The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention.

The controller 200 receives an image signal from the outside and outputs an A electrode driving control signal, an X electrode driving control signal, and a Y electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields, and each subfield is composed of a reset period, an address period, and a sustain period.

The address electrode driver 300 receives an A electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each A electrode.

The scan electrode driver 400 receives a Y electrode driving control signal from the controller 200 and applies a driving voltage to the Y electrode.

The sustain electrode driver 500 receives the X electrode driving control signal from the controller 200 and applies a driving voltage to the X electrode.

Next, the plasma display panel 100 illustrated in FIG. 1 will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a perspective view of the plasma display panel 100 shown in FIG. 1 seen from the rear side, and FIG. 3 is a cross-sectional view taken along line II ′ of FIG. 2.

2 and 3, in the plasma display panel 100, one substrate 10 (hereinafter referred to as a "back substrate") and the other substrate 20 (hereinafter referred to as a "front substrate") have a predetermined distance from each other. Are placed opposite each other. A plurality of discharge cells 12 are formed in the space between the back substrate 10 and the front substrate 20. An A electrode extends in the column direction (y-axis direction) on the back substrate 10, and is formed in parallel with a neighboring A electrode at regular intervals. The partition wall 17 is formed along the direction in which the A electrode extends (the y-axis direction in FIG. 2) and the direction orthogonal thereto (the x-axis direction in FIG. 2). In this way, the discharge cells 12 are partitioned by the partition walls 17 formed in a lattice shape. At this time, red, green, and blue fluorescent layers are formed in the discharge cell 12 region, respectively, to determine the color of the discharge cell 12. The X electrode and the Y electrode extend in the direction orthogonal to the A electrode (the x-axis direction in FIG. 2) on the front substrate 20. A transparent dielectric layer and a passivation layer are formed on the front substrate 20 while covering the X electrode and the Y electrode, and the passivation layer may be formed of an MgO component having a good secondary electron emission coefficient.

The rear substrate 10 and the front substrate 20 configured as described above are enclosed with glass frit 30 and an exhaust port 13 is formed at one side of the rear substrate. The exhaust port 13 serves as a passage for connecting the discharge space formed between the rear substrate 10 and the front substrate 20, that is, the discharge cell 12 to the outside. And the exhaust pipe 15 is attached to the outer side of the rear substrate 10 of the exhaust port 23, which protrudes outward. When exhaust and gas are injected by the exhaust pipe 15, the inside and the outside of the plasma display panel 100 are connected. After the discharge gas is injected, the exhaust pipe 25 is sealed so that the inside and the outside of the plasma display panel 100 are sealed. It is isolated. In FIG. 2, it is assumed that the exhaust port 13 is formed above and below the left side of the plasma display panel 100.

Next, a driving waveform of the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 4. In the following description, only the driving waveforms applied to the Y electrode, the X electrode, and the A electrode forming one cell will be described.

4 is a diagram illustrating driving waveforms of a plasma display device according to an exemplary embodiment of the present invention.

As shown in Fig. 4, in the rising period of the reset period, the voltage of the Y electrode gradually increases from the voltage Vs to the voltage Vset while the X electrode is held at the reference voltage (0 V in Fig. 4). In FIG. 4, the voltage of the Y electrode is shown to increase in the form of a lamp. Then, while the voltage of the Y electrode is increased, a weak discharge (hereinafter referred to as “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 applied to the Y electrode. And a positive wall charge is formed on the X and A electrodes.

In the falling period of the reset period, the voltage of the Y electrode gradually decreases from the Vs voltage to the Vnf voltage while the X electrode is maintained at the Ve voltage. Then, while the voltage of the Y electrode decreases, 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 electrode and the A electrode. Is erased. In general, the magnitude of the (Vnf-Ve) voltage is set near the discharge start voltage between the Y electrode and the X electrode. As a result, the wall voltage between the Y electrode and the X electrode becomes almost 0 V, whereby a cell that does not have an address discharge in the address period can be prevented from being erroneously discharged in the sustain period.

In the address period, in order to select discharge cells to emit light, scan pulses having a VscL voltage are sequentially applied to the plurality of Y electrodes. At this time, when the scan pulse is applied to the Y electrode of the discharge cell located in the region where the discharge delay between the Y electrode and the A electrode is large, the Ve2 voltage is applied to the X electrode, and the region where the discharge delay between the Y electrode and the A electrode is small. When a scan pulse is applied to the Y electrode of the discharge cell located at, the Ve1 voltage lower than the Ve2 voltage is applied to the X electrode. The Va voltage is applied to the A electrode passing through the discharge cell to be selected from the plurality of discharge cells formed by the Y electrode and the X electrode to which the VscL voltage is applied. Then, an address discharge is generated between the A electrode to which the Va voltage is applied and the Y electrode to which the VscL voltage is applied, and the Y electrode to which the VscL voltage is applied, and the X electrode to which the Ve1 (or Ve2) voltage is applied, thereby generating a positive (+) A negative wall charge is formed at the wall charge, the A electrode, and the X electrode, respectively. Here, the VscL voltage may be set at a level equal to or lower than the Vnf voltage. The VscH voltage higher than the VscL voltage is applied to the Y electrode to which the VscL voltage is not applied, and the reference voltage is applied to the A electrode of the discharge cell that is not selected.

For example, when looking at the plasma display panel 100 shown in FIG. 2, since the discharge cells located in the area far from the exhaust port 13 have a large discharge delay, they are far from both the exhaust ports 13 in distance in the address period. When a scan pulse is applied to the Y electrode of the discharge cell, that is, the Y electrode positioned in the middle portion of the plasma display panel 100, the voltage Ve2 is applied to the X electrode, and the Y electrode of the discharge cell close to both exhaust ports 13, When scan pulses are applied to the Y electrodes positioned above and below the plasma display panel 100, the Ve1 voltage may be applied to the X electrodes. That is, in the embodiment of the present invention, the control unit 200 divides the plurality of Y electrodes into a plurality of groups, and the Y electrode of the discharge cell is far from the exhaust port 13 formed in the plasma display panel 100 in a distance. When the scan pulse is applied to the Y electrode of the group comprising a voltage applied to the X electrode to the X electrode when the scan pulse is applied to the Y electrode of the group including the Y electrode of the discharge cell close to the exhaust port 13 The sustain electrode driver 500 may be controlled to be applied higher than the applied voltage. In this way, when the voltage applied to the X electrode of the discharge cell with a large discharge delay in the address period is increased, the voltage difference between the Y electrode and the X electrode is larger than the case where the voltage applied to the X electrode is low, so that address discharge occurs easily. Can be. As a result, a large number of negative wall charges are formed on the X electrode, so that subsequent sustain discharges may occur well. In addition, by making the voltage applied to the X electrode of the discharge cell having a large discharge delay in the address period higher than the voltage applied to the X electrode of the discharge cell having a large discharge delay, the discharge conditions are made to be the same in all the cells of the plasma display panel 100 as much as possible. It becomes possible.

In the sustain period, a sustain discharge pulse having an alternating Vs voltage and a 0V voltage is applied to the Y electrode and the X electrode in the opposite phase so that the sustain discharge occurs between the Y electrode and the X electrode. Thereafter, the process of applying the sustain discharge pulse of the Vs voltage to the Y electrode and the process of applying the sustain discharge pulse of the Vs voltage to the X electrode are repeated the number of times corresponding to the weight indicated by the corresponding subfield.

Meanwhile, in the embodiment of the present invention, the case where the sustain discharge pulse having the Vs voltage and the 0V voltage are alternately applied to the Y electrode and the X electrode has been described in the opposite phase, but between the Y electrode (or the X electrode) and the A electrode is described. The present invention can also be applied when another type of sustain discharge pulse is applied that can cause discharge first. For example, the present invention can be applied even when a sustain discharge pulse having alternating Y electrodes, a Vs voltage, and a -Vs voltage is applied while the X electrode is biased to 0V.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, when the scan pulse is applied to the Y electrode of the cell having a large discharge delay in the address period, that is, when the scan pulse is applied to the Y electrode of the discharge cell far from the exhaust port formed in the plasma display panel. By applying a high voltage to the X electrode, address discharge can be stably generated in a discharge cell having a large discharge delay.

Claims (8)

A plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, and the first electrode, the second electrode, and the third electrode, respectively. In the plasma display device including a plurality of discharge cells defined in the driving method by dividing a frame into a plurality of subfields, In the address period, Applying a second voltage to a second electrode of a first group in a state where a first voltage is applied to the plurality of first electrodes, and Applying the second voltage to the second electrode of the second group in a state where a third voltage higher than the first voltage is applied to the plurality of first electrodes, The discharge delay between any one of the second electrode and the third electrode of the second group of the second group is, the discharge delay between any one of the second electrode and the third electrode of the second group of the first group A method of driving a larger plasma display device. The method of claim 1, And the discharge delay of a discharge cell located in a region far from an exhaust port formed in the plasma display device is larger than the discharge delay of a discharge cell located in a region close to the exhaust port. The method of claim 2, And applying a fourth voltage to a third electrode of a discharge cell to emit light in the address period. The method according to any one of claims 1 to 3, And alternately applying a fifth voltage and a sixth voltage lower than the fifth voltage to the plurality of second electrodes and the plurality of first electrodes in the sustain period. The method according to any one of claims 1 to 3, And alternately applying the fifth voltage and the sixth voltage lower than the fifth voltage to the plurality of second electrodes while the fifth voltage is applied to the plurality of first electrodes in the sustain period. Method of driving the display device. A plurality of scan electrodes and a plurality of sustain electrodes, a plurality of address electrodes formed in a direction crossing the scan electrode and the sustain electrode, and a plurality of discharge cells defined by the scan electrodes, the sustain electrodes, and the address electrodes, respectively. A plasma display panel, and In a state in which a first voltage is applied to the plurality of sustain electrodes in an address period, the driving unit sequentially applies a scan pulse to the scan electrodes of the discharge cells to emit light among the plurality of scan electrodes, The discharge delay between the first scan electrode and the address electrode is greater than the discharge delay between the second scan electrode and the address electrode, The driving unit may be configured such that the first voltage when a scan pulse is applied to a first scan electrode of the plurality of scan electrodes is the first voltage when the scan pulse is applied to a second scan electrode of the plurality of scan electrodes. Plasma display device to apply higher. The method of claim 6, The plasma display panel, A first substrate on which the plurality of scan electrodes and the plurality of sustain electrodes are formed; A second substrate having the plurality of address electrodes formed thereon, and At least one exhaust port formed in the second substrate and forming a passage connected to the discharge cell; And the first scan electrode is further from the exhaust port than the second scan electrode. The method of claim 7, wherein The driving unit, And applying an address pulse to an address electrode passing through a discharge cell to emit light among discharge cells formed by the first scan electrode and the second scan electrode to which the scan pulse is applied.

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