KR100777748B1 - Method of driving plasma display apparatus - Google Patents

Abstract

A method for driving a plasma display device is provided to reduce EMI(Electro Magnetic Interference) by lowering a hard switching current in X electrodes during a reset period or an address period. A frame includes plural subfields based on gray scale weighted values for time division gray scale display. Each of the subfields includes reset, address, and sustain periods(PR,PA,PS). The reset period includes a first reset period(PR1) for applying a first voltage to X electrodes, a second period(PR2) for applying ramp pulses from an energy recovering circuit, which are gradually increased from a first voltage to a second voltage, and a third reset period(PR3) for biasing the second voltage. A ramp-up voltage, which is increased from a third voltage(Vs) to a fourth voltage(Vs+Vset) after applying a first voltage during the first reset period, the third voltage during the second reset period, and a ramp-down voltage, which is decreased from the third voltage to a fifth voltage(Vnf), are applied to Y electrodes.

Description

Method of driving plasma display apparatus {Method of driving plasma display apparatus}

1 is a view showing an example of the structure of a plasma display panel driven by the driving method of the present invention.

FIG. 2 is a view schematically illustrating an electrode arrangement of the plasma display panel of FIG. 1.

3 is a block diagram schematically illustrating an apparatus for driving a plasma display panel for driving the plasma display panel of FIG. 1.

4 is a circuit diagram illustrating an example of the X electrode driver of FIG. 3.

5 is a circuit diagram illustrating an example of the Y electrode driver of FIG. 3.

6 is a timing diagram showing a driving signal output to the electrodes by the driving method of the plasma display device according to an embodiment of the present invention and a waveform diagram of the driving switching signal.

7 is a timing diagram showing a driving signal output to the electrodes by the driving method of the plasma display device according to another embodiment of the present invention and a waveform diagram of the driving switching signal.

8A is a graph illustrating a result of measuring a hard switching current of a second voltage Vb according to a conventional driving method.

8B is a graph illustrating a result of measuring a hard switching current of the second voltage Vb according to the driving method of FIG. 6.

Explanation of symbols on the main parts of the drawings

Y1, ..., Yn ... scanning electrode lines

X1, ..., Xn ... holding electrode lines

A1, ..., Am ... address electrode lines

Vg ... first voltage Vb ... second voltage

Vs ... third voltage Vs + Vset ... fourth voltage

Vnf ... fifth voltage Vsch ... sixth voltage

Vscl ... 7th voltage Va ... 8th voltage

400 ... X drive 500 ... Y drive

The present invention relates to a method for driving a plasma display device, and more particularly, to a method for driving a plasma display device capable of reducing reactive power consumption and electro magnetic interference (EMI).

 Recently, a plasma display panel, which is attracting attention as a large flat panel display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. Phosphor formed in the pattern of is excited to obtain a desired image.

The driving apparatus of the plasma display apparatus includes a plurality of driving ICs for controlling switching operations of the plurality of voltage sources, the plurality of switching elements, and the plurality of switching elements to apply a driving signal to each of the plasma display panel, and more particularly, the plurality of electrodes. Equipped. The driving signal is output from the driving apparatus of the plasma display panel by the switching operation of the plurality of switching elements.

Meanwhile, an energy regeneration circuit must be provided in a driving device of the plasma display panel with high driving power consumption. Each time the discharge sustain pulses are applied, a displacement current corresponding to the reactive power flows to each cell of the AC-PDP, and the discharge current flows from the moment when the discharge start voltage is exceeded by adding the wall voltage and the external voltage to form a plasma discharge. The sustain discharge is a discharge in which plasma discharge is initiated only when certain conditions inside the cell are satisfied when a constant voltage is applied, and even if the discharge current does not flow even in cells that do not satisfy the condition, the displacement current always flows. The amount of displacement current depends on the intrinsic capacitance, which varies depending on the shape and constituent material of each pixel. Since the consumption of reactive power by this capacitance is considerable, an energy regeneration circuit is required to reduce wasted reactive power.

Such an energy regeneration circuit is provided in the X electrode driver and the Y electrode driver. When a sustain pulse for display discharge is periodically applied to the X electrode lines and the Y electrode lines in the sustain period constituting the subfield for time division gray scale display, the energy regeneration circuit is applied to the discharge cells displayed in the current pulse period. Unnecessary power is recovered and applied to discharge cells to be displayed in the next pulse period.

However, the energy regeneration circuit has not yet been used to reduce the reactive power consumption in the reset period or the address period.

An object of the present invention is to provide a method of driving a plasma display device capable of reducing hard switching current of a voltage applied to an X electrode in a reset period or an address period, and reducing reactive power consumption and EMI (Electro Magnetic Interference).

According to an aspect of the present invention, there is provided a panel including discharge cells formed in an area where address electrodes intersect with respect to sustain electrode pairs in which X and Y electrodes are alternately arranged side by side; And an electrode driver for outputting a driving signal to the electrodes and including an energy recovery circuit, wherein the frame as a display period includes a plurality of subfields for time division gray scale display. The subfield includes a reset period, an address period, and a sustain period, wherein the reset period includes a first reset period for applying a first voltage to the X electrodes, and a ramp pulse continuously rising from the first voltage to the second voltage. And a second reset section for applying a voltage of a waveform, and a third reset section for holding and biasing the second voltage, wherein the application of the voltage of the ramp pulse waveform of the second reset section is performed by the energy recovery circuit. A driving method of a plasma display apparatus is performed.

The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. And a second switching element to control the first switching element and turning on the first switching element in the second reset period.

The energy recovery circuit may further include an inductor having one end connected to the panel.

The first voltage may be a ground voltage.

The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. A fourth switching element for controlling output to the X electrodes, turning off the fourth switching element in the first and second reset periods, and turning on the fourth switching element in the third reset period. You can.

The first voltage may be applied to the address electrodes in the reset period.

After the first voltage is applied to the Y electrodes in the first reset period for a predetermined period, a voltage of a ramp pulse waveform continuously rising from a third voltage to a fourth voltage is applied to the Y electrodes. Three voltages may be applied, and a voltage of a ramp pulse waveform continuously falling from the third voltage to the fifth voltage may be applied in the third reset period.

In the address period, a second voltage is continuously applied to the X electrodes, and a scan pulse of a seventh voltage is applied to the Y electrodes while being biased with a sixth voltage, and displayed with the Y electrodes. Data pulses of an eighth voltage synchronized with the scan pulse may be applied to the address electrodes forming the discharge cells.

The data pulse may be a positive pulse and the scan pulse may be a negative pulse.

In the sustain period, a first voltage and a ninth voltage may be alternately applied to the Y electrodes and the X electrodes, respectively.

The address period includes a first address period for maintaining and biasing the X electrodes and a second address period for applying a voltage of a ramp pulse waveform continuously falling from the second voltage to the first voltage. In addition, the application of the voltage of the ramp pulse waveform of the second address period may be performed by the energy recovery circuit.

The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. And a second switching element to control the second switching element, and turn on the second switching element in the second address period.

The second switching element may be turned on even in a period in which the first voltage is applied to the Y electrodes at the beginning of the sustain period.

The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. And a fourth switching element for controlling output to the X electrodes, turning off the third switching element in an address period and turning on in an initial period of a sustain period, and turning the fourth switching element into the first address period. It may be turned on until a predetermined time point before the second address period and turned off in the remaining period of the first address period, the second address period and the sustain period.

The initial period of the sustain period may be a period in which a first voltage is applied to the X electrodes.

According to an aspect of the present invention, there is provided a panel including discharge cells formed in an area where address electrodes intersect with respect to sustain electrode pairs in which X and Y electrodes are alternately arranged side by side; And an electrode driver for outputting a driving signal to the electrodes and including an energy recovery circuit, wherein the frame as a display period includes a plurality of subfields for time division gray scale display. The subfield includes a reset period, an address period, and a sustain period, and the address period is continuously lowered from the second voltage to the first voltage and the first address period for maintaining and biasing the second voltage on the X electrodes. And a second address section for applying a voltage of a ramp pulse waveform, wherein the application of the voltage of the ramp pulse waveform in the second address section is performed by the energy recovery circuit.

The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. And a second switching element to control the second switching element, and turn on the second switching element in the second address period.

The second switching element may be turned on even in a period in which the first voltage is applied to the Y electrodes at the beginning of the sustain period.

The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. And a fourth switching element for controlling output to the X electrodes, turning off the third switching element in an address period and turning on in an initial period of a sustain period, and turning the fourth switching element into the first address period. It may be turned on until a predetermined time point before the second address period and turned off in the remaining period of the first address period, the second address period and the sustain period.

The initial period of the sustain period may be a period in which a first voltage is applied to the X electrodes.

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

1 is a view showing an example of the structure of a plasma display panel driven by the driving method of the present invention.

Referring to FIG. 1, between the first substrate 100 and the second substrate 106 of the plasma display panel 1, the A electrodes A1,..., Am and the first and second dielectric layers 102, 110 are described. ), Y electrodes (Y1, ..., Yn), X electrodes (X1, ..., Xn), phosphor layer 112, barrier rib 114 and magnesium monoxide (MgO) protective layer 104 It is prepared.

The A electrodes A1, ..., Am are formed in a predetermined pattern on the second substrate 106 in the direction of the first substrate 100. The second dielectric layer 110 is applied to cover the A electrodes A1,..., Am. The partition walls 114 are formed on the second dielectric layer 110 in a direction parallel to the A electrodes A1,..., Am. The partition walls 114 function to partition the discharge region of each discharge cell and to prevent optical interference between the discharge cells. The phosphor layer 112 is applied on the second dielectric layer 110 on the A electrodes A1,..., Am between the partition walls 114, and sequentially a red light emitting phosphor layer, a green light emitting phosphor layer, and A blue light emitting phosphor layer is disposed.

The X electrodes X1, ..., Xn and the Y electrodes Y1, ..., Yn are formed in the direction of the second substrate 106 to be orthogonal to the A electrodes A1, ..., Am. 1 is formed on the substrate 100 in a predetermined pattern. Each intersection sets a corresponding discharge cell. Each of the X electrodes (X1, ..., Xn) and each of the Y electrodes (Y1, ..., Yn) has conductivity with a transparent conductive material (Xna, Yna) made of a transparent conductive material such as indium tin oxide (ITO), etc. Metal electrodes (Xnb, Ynb) for increasing the ratio may be formed. The first dielectric layer 102 is formed by coating the entire surface to cover the X electrodes X1,..., Xn and the Y electrodes Y1,..., Yn. A protective layer 104, for example a magnesium monoxide (MgO) layer, is formed over the entire surface of the first dielectric layer 102 to protect the panel from a strong electric field. The plasma forming gas is sealed in the discharge space 108.

Meanwhile, the plasma display panel driven by the driving apparatus of the present invention is not limited to that shown in FIG. That is, as shown in FIG. 1, not a plasma display panel having a three electrode structure, but a plasma display panel having a two electrode structure in which only two electrodes are disposed. In addition, a plasma display panel having various structures is possible. It will be sufficient if it is driven by the driving method.

FIG. 2 is a view schematically illustrating an electrode arrangement of the plasma display panel of FIG. 1.

Referring to FIG. 2, the Y electrodes Y1,..., Yn and the X electrodes X1,..., Xn are arranged side by side in parallel, and the A electrodes A1,..., Am. Is disposed to intersect the Y electrodes Y1, ..., Yn and the X electrodes X1, ..., Xn, and the intersecting region divides the discharge cell Ce.

3 is a block diagram schematically illustrating an apparatus for driving a plasma display panel for driving the plasma display panel of FIG. 1.

Referring to FIG. 3, an apparatus for driving a plasma display panel includes an image processor 300, a logic controller 302, a Y driver 304, an address driver 306, an X driver 308, and a plasma display panel 1. It is provided. The image processing unit 300 converts an external image signal from the outside and outputs it as an internal image signal, and the logic controller 302 receives the internal image signal and receives an address driving control signal SA and a Y driving control signal SY, respectively. And an X driving control signal SX, and the Y driving unit 304, the address driving unit 306, and the X driving unit 308 receive driving driving signals, respectively, and Y electrodes and A electrodes of the plasma display panel 1. Outputs a drive signal to each of the and the X electrodes.

4 is a circuit diagram illustrating an example of the X electrode driver of FIG. 3.

Referring to FIG. 4, the X driver 400 outputs a first voltage, which is a ground voltage Vg, to output a driving signal to the X electrodes Cp. And a sustain pulse applying unit 40 including a ninth voltage applying unit 401 for outputting a ninth voltage Vs, a second voltage applying unit 405 for outputting a second voltage Vb, and a panel. An energy recovery unit 42 for accumulating charges in the battery or storing charges in the panel, and a switching unit 407.

The first voltage applying unit 403 includes a third switching element S3 having one end connected to ground and the other end connected to the switching unit 407. The ninth voltage applying unit 401 includes a fifth switching element S5 having one end connected to the ninth voltage source Vs and the other end connected to the switching unit 407. The sustain pulse applying unit 40 including the first voltage applying unit 403 and the ninth voltage applying unit 401 uses the third switching element S3 and the fifth switching element S5 to generate the sustain pulse. Turn on alternately.

The fourth switching element S4 has one end connected to the second voltage source Vb and the other end connected to the X electrodes (first end of Cp) and the switching unit 407 of the panel. ). The fourth switching element S4 is turned on so that the second voltage Vb is output to the X electrodes C1 of the panel.

The energy recovery unit 42 accumulates in the panel Cp an energy storage unit 420 for storing charges in the panel Cp, and charges connected to the energy storage unit 420 and stored in the energy storage unit 420. An energy recovery switching unit 422 for controlling the storage of charges in the panel Cp in the energy storage unit 420, one end of which is connected to the energy recovery switching unit 422, and the other end of the X electrodes Cp of the panel; An inductor L1 connected to the first stage).

The energy store 420 may include a capacitor C2 to store charges in the panel.

The energy recovery switching unit 422 includes a first switching element S1 and a second switching element S2 having one end connected to the energy storage unit 420 and the other end connected to the inductor L1. Two first and second diodes D1 and D2 having different directions may be connected between the device S1 and the second switching device S2.

Referring to the operation of the energy recovery unit 42, when the second switching element S2 of the energy recovery switching unit 422 is turned on, the charges in the panel are inductor L1, the second diode D2, It is stored in the second capacitor C2 via the second switching element S2. When the first switching device S1 of the energy recovery switching unit 422 is turned on, the charge stored in the second capacitor C2 is transferred to the first switching device S1, the first diode D1, and the inductor L2. Is accumulated in the panel Cp through

One end of the switching unit 407 is connected to the sustain pulse applying unit 40, and the other end thereof is connected between the second voltage applying unit 405 and the X electrodes (first end of Cp) of the panel and ground. 6 switching elements S6 are provided. The switching unit 407 performs a switching operation to apply the sustain pulse output from the sustain pulse applying unit 40 to the X electrodes of the panel, and the second voltage Vb output from the second voltage applying unit 405. ) Does not flow to the sustain pulse applying unit 40. That is, the sixth switching element S6 is turned on to apply the sustain pulse to the X electrodes (first stage of Cp) of the panel, and the second voltage Vb does not flow to the sustain pulse applying unit 40. To be turned off.

5 is a circuit diagram illustrating an example of the Y electrode driver of FIG. 3.

Referring to FIG. 5, the Y electrode driver 500 outputs a ninth voltage Vs to the first node N1 in order to output a driving signal to the Y electrodes Cp. The sustain pulse applying unit 50 including the applying unit 501 and the first voltage applying unit 503 for outputting the first voltage, which is the ground voltage Vg, to the first node N1, and one end thereof is the first node. A first switching unit 505 including a seventh switching element S7 connected to N1 and the other end connected to the second node N2, and one end connected to the second node N2, and the other end of the first switch 505. The second switching unit 517 including the fifteenth switching element S15 connected to the third node N3 and the first node N1 and the second node N2 may be connected to and be equal to the ninth voltage. The third voltage Vs is gradually increased by the tenth voltage Vset and output to the second node N2, and the tenth voltage applying unit 507 is connected to the third node N3 and is connected to the third voltage. (Vs) is gradually lowered to the fifth voltage (Vnf) to output to the third node (N3) The fifth voltage applying unit 509 includes a first scan switching element SC1 and a second scan switching element SC2 connected in series with each other, and includes a first scan switching element SC1 and a second scan switching element SC2. The fourth node (N4) between the () and the scan switching unit 511 connected to the Y electrodes (second end of the Cp) of the panel, and the sixth voltage source (Vsch) and the first scan switching device (SC1) ) Is connected to the sixth voltage applying unit 513 for outputting the sixth voltage Vsch to the first scan switching element SC1, and the third node N3 and the second scan switching element SC2. And a seventh voltage applying unit 515 for outputting a seventh voltage Vscl and an energy recovery unit 52 for accumulating charges in the panel Cp or storing charges in the panel Cp.

The ninth voltage applying unit 501 includes an eighth switching element S8 having one end connected to the ninth voltage source Vs and the other end connected to the first node N1. The first voltage applying unit 503 includes a ninth switching element S9 having one end connected to ground and the other end connected to the first node N1. The sustain pulse applying unit 50 including the first voltage applying unit 503 and the ninth voltage applying unit 501 may include the eighth switching element S8 and the ninth switching element S9 to generate a sustain pulse. It is turned on alternately.

The tenth voltage applying unit 507 has a fourth capacitor C4, one end of which is connected to the first node N1 and the other end of which is connected to a tenth voltage source Vset, a tenth voltage source Vset, and a second node ( A tenth switching element S10 connected between N3) is provided. The seventh switching element S7 of the first switching unit 505 is turned off, the fifteenth switching element of the second switching unit 617 is turned on, and the eighth switching element of the first voltage applying unit 601. S10 and the tenth switching element S10 of the third voltage applying unit 607 are turned on and gradually rise from the third voltage Vs by the tenth voltage Vset to finally obtain the fourth voltage Vset + Vs. ) Is output to the third node N3.

The fifth voltage applying unit 509 includes an eleventh switching element S11 having one end connected to the third node N3 and the other end connected to the fifth voltage source Vnf. The eighth switching element S8 of the ninth voltage applying unit 501, the seventh switching element S7 of the first switching unit 505, the fifteenth switching element S15 of the second switching unit 517, and the eighth switching element S501. The eleventh switching element S11 of the fifth voltage applying unit 509 is turned on and the voltage gradually lowered from the third voltage Vs to the fifth voltage Vnf is output to the third node N3.

The seventh voltage applying unit 515 includes a twelfth switching element S12 connected between the third node N3 and the seventh voltage source Vscl. The twelfth switching element S12 is turned on and outputs a seventh voltage Vscl to the third node N2.

When the first scan switching device SC1 of the scan switching unit 511 is turned on and the second scan switching device SC2 is turned off, the sixth voltage Vsch passes through the fourth node N4 to Y electrodes. It is output to (the second stage of Cp). On the other hand, when the first scan switching device SC1 of the scan switching unit 511 is turned off and the second scan switching device SC2 is turned on, each voltage output to the third node N3, that is, the third voltage Vs, the ground voltage Vg, the fourth voltage Vs + Vset, the fifth voltage Vnf, and the seventh voltage Vscl pass through the fourth node N4 to form the second terminal of the Y electrodes Cp. )

The energy recovery unit 52 accumulates in the panel Cp an energy storage unit 520 for storing charges in the panel Cp, and charges connected to the energy storage unit 520 and stored in the energy storage unit 520. An energy recovery switching unit 522 for controlling the storage of charges in the panel Cp in the energy storage unit 520, one end of which is connected to the energy recovery switching unit 522, and the other end of which is connected to the first node N1. Inductor L2 is provided.

The energy store 520 may have a capacitor C5 to store the charges in the panel.

The energy recovery switching unit 522 includes a thirteenth switching element S13 and a fourteenth switching element S14 having one end connected to the energy storage unit 520 and the other end connected to the inductor L2. Two third and fourth diodes D3 and D4 having different directions may be connected between the element S13 and the fourteenth switching element S14.

In order to explain the operation of the energy recovery unit 52, once the seventh switching element S7 of the first switching unit 505 and the second scan switching element SC2 of the scan switching unit 511 are turned on. Assume that it is a state. When the fourteenth switching element S14 of the energy recovery switching unit 522 is turned on, the charge in the panel Cp passes through the inductor L2, the fourth diode D4, and the fourteenth switching element S14. It is stored in the fifth capacitor C5. When the thirteenth switching element S13 of the energy recovery switching unit 522 is turned on, the charge stored in the fifth capacitor C5 is transferred to the thirteenth switching element S13, the third diode D3, and the inductor L2. Is accumulated in the panel Cp through

6 is a timing diagram showing a driving signal output to the electrodes by the driving method of the plasma display device according to an embodiment of the present invention and a waveform diagram of the driving switching signal.

Referring to FIG. 6, a unit frame for driving the plasma display panel (1 of FIG. 3) is divided into a plurality of subfields, and each subfield SF includes a reset period PR, an address period PA, and a sustain period. Divided into (PS).

The reset period PR initializes all the discharge cells and is further divided into a first reset period PR1, a second reset period PR2, and a third reset period PR3.

In the first reset period PR1, a first voltage Vg, for example, a ground voltage is applied to the X electrodes X1, ..., Xn, and the Y electrodes Y1, ..., Yn. After applying the first voltage Vg to a predetermined period of time, a voltage of a ramp pulse waveform continuously rising from the third voltage Vs to the fourth voltage Vs + Vset is applied.

In the second reset period PR2, a voltage of a ramp pulse waveform continuously rising from the first voltage Vg to the second voltage Vb is applied to the X electrodes X1,..., Xn. The third voltage Vs is applied to the Y electrodes Y1,..., And Yn.

In the third reset period PR3, the second voltage Vb is maintained at the X electrodes X1,..., And Xn to bias and biased to the Y electrodes Y1,..., Yn. The voltage of the ramp pulse waveform continuously falling from the third voltage Vs to the fifth voltage Vnf is applied.

During the reset period, a first voltage Vg is applied to the address electrodes Al, ..., Am.

Application of the voltage of the ramp pulse waveform continuously rising from the first voltage Vg of the second reset period PR2 to the second voltage Vb to the X electrodes X1, ..., Xn is shown in FIG. This may be performed by applying electric charges stored in the energy recovery circuit 42 to the X electrodes X1, ..., Xn.

To this end, in the second reset period PR2, a first switching device (FIG. 3) controlling the application of charges stored in the energy storage unit 420 included in the energy recovery circuit 42 of FIG. 4 to the panel Cp (FIG. S1) of 4 can be turned on. In addition, the first switching element S1 of FIG. 4 may be extended to the initial part of the third reset period PR2 and turned on.

In addition, the fourth switching element (S4 of FIG. 4) connected to the second voltage source and controlling the output of the second voltage to the X electrodes X1,. It may be turned off in the second reset period PR2 and turned on in the third reset period PR3.

By the above configuration, it is possible to reduce the hard switching current of the second voltage Vb applied to the X electrodes X1, ..., Xn, and to reduce reactive power consumption and EMI (Electro Magnetic Interference). Has the advantage.

The address period PA selects a discharge cell in which the sustain discharge generated in the sustain period PS is to be performed by the address discharge. In the address period PA, the second voltage Vb is continuously applied to the X electrodes X1, ..., Xn, and the scanning pulse is sequentially applied to the Y electrodes Y1, ..., Yn. The display data signal is applied to the address electrodes A1, ..., Am in accordance with the scan pulse to perform address discharge. The scan pulse has a sixth voltage Vsch and sequentially has a seventh voltage Vscl whose voltage is smaller than the sixth voltage Vsch, and the display data signal is synchronized when the seventh voltage Vscl of the scan pulse is applied. The positive eighth voltage Va is obtained.

In the sustain period PS, a sustain pulse is alternately applied to the X electrodes X1, ..., Xn and the Y electrodes Y1, ..., Yn to perform a sustain discharge. The luminance of the unit field consisting of a plurality of subfields is represented by sustain discharge according to the gray scale weights assigned to each subfield. The sustain pulse alternately has the ninth voltage Vs and the ground voltage Vg. The ninth voltage may be equal to the third voltage.

7 is a timing diagram showing a driving signal output to the electrodes by the driving method of the plasma display device according to another embodiment of the present invention and a waveform diagram of the driving switching signal.

Hereinafter, the embodiment of FIG. 7 will be described centering on a part different from the embodiment of FIG. 6. Referring to FIG. 7, the address period PA is divided into a first address period PA1 and a second address period PA2.

In the first address period PA1, the second voltage Vb is maintained and biased at the X electrodes X1,..., Xn.

In the second address period PA2, a voltage of a ramp pulse waveform continuously falling from the second voltage Vb to the first voltage Vg is applied to the X electrodes X1,..., Xn. The application of the voltage of the ramp pulse waveform of the ramp pulse waveform continuously falling from the second voltage Vb of the second address period PA2 to the first voltage Vg to the X electrodes X1, ..., Xn is in the panel. The accumulated charges can be performed by recovering the energy recovery circuit 42 (Fig. 4).

To this end, in the second address period PA2, the second switching element (S2 of FIG. 4) may be turned on to control the storage of charges in the panel Cp of FIG. 4 in the energy storage unit 420. In addition, the second switching element (S2 of FIG. 4) may be extended and turned on to an initial part of the sustain period PS.

In addition, the third switching device (S3 of FIG. 4) is turned off in the address period PA and a first voltage is applied to an initial period of the sustain period PS, for example, the X electrodes X1,..., Xn. Turn on in the period in which Vg is applied, turn on the fourth switching element S4 to a predetermined time point before the second address period PA2 of the first address period PA1, and turn on the first address period PA1. It may be turned off in the remaining period of, the second address period (PA2) and the sustain period (PS).

By the above configuration, it is possible to reduce the hard switching current of the second voltage Vb applied to the X electrodes X1, ..., Xn, and to reduce reactive power consumption and EMI (Electro Magnetic Interference). Has the advantage.

8A is a graph illustrating a result of measuring a hard switching current of a second voltage Vb according to a conventional driving method, and FIG. 8B is a diagram of measuring the hard switching current of a second voltage Vb according to the driving method of FIG. 6. A graph showing the results.

8A and 8B, according to an embodiment of the method of driving the plasma display device, the hard switching current of the second voltage Vb applied to the X electrodes X1,. It can be seen that it can be reduced, thereby reducing EMI (Electro Magnetic Interference).

As described above, according to the driving method of the plasma display apparatus of the present invention, the hard switching current of the voltage applied to the X electrode in the reset period or the address period can be reduced, and the reactive power consumption and EMI (Electro Magnetic Interference) can be reduced. have.

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 (19)

A panel in which discharge cells are formed in a region where the address electrodes intersect with respect to the pair of sustain electrodes in which the X electrodes and the Y electrodes are alternately arranged side by side; And an electrode driver for outputting a driving signal to the electrodes and including an energy recovery circuit. The frame as the display period includes a plurality of subfields for time division gray scale display, each subfield including a reset period, an address period, and a sustain period, The reset period includes a first reset period for applying a first voltage to the X electrodes, a second reset period for applying a voltage of a ramp pulse waveform continuously rising from the first voltage to a second voltage, and the second reset period. A third reset period for maintaining and biasing the voltage; The application of the voltage of the ramp pulse waveform of the second reset period is performed by the energy recovery circuit, After the first voltage is applied to the Y electrodes in the first reset period for a predetermined period, a voltage of a ramp pulse waveform continuously rising from a third voltage to a fourth voltage is applied to the Y electrodes. 3. The driving method of the plasma display apparatus of applying a voltage and applying a voltage of a ramp pulse waveform continuously falling from the third voltage to a fifth voltage in the third reset period. The method of claim 1, The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. A second switching element for controlling the And driving the first switching device in the second reset period. The method of claim 2, The energy recovery circuit further includes an inductor having one end connected to the panel. The method of claim 1, And the first voltage is a ground voltage. The method of claim 1, The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. A fourth switching element for controlling output to the X electrodes, Turning off the fourth switching device in the first and second reset periods, And driving the fourth switching device in the third reset period. The method of claim 1, And a first voltage applied to the address electrodes in the reset period. The method of claim 1, In the address period, A second voltage is subsequently applied to the X electrodes, A scan pulse of a seventh voltage is applied to the Y electrodes in a biased state at a sixth voltage, And a data pulse of an eighth voltage synchronized with the scan pulse from a first voltage to address electrodes forming discharge cells to be displayed with the Y electrodes. The method of claim 7, wherein And the data pulse is a positive pulse and the scan pulse is a negative pulse. The method of claim 1, And a first voltage and a ninth voltage are alternately applied to the Y electrodes and the X electrodes in the sustain period. The method of claim 1, The address period includes a first address period for maintaining and biasing the X electrodes and a second address period for applying a voltage of a ramp pulse waveform continuously falling from the second voltage to the first voltage. and, And applying the voltage of the ramp pulse waveform in the second address section by the energy recovery. The method of claim 10, The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. A second switching element for controlling the And driving the second switching device in the second address period. The method of claim 11, And the second switching element is turned on even when the first voltage is applied to the Y electrodes at the beginning of the sustain period. The method of claim 10, The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. A fourth switching element for controlling output to the X electrodes, The third switching device is turned off in an address period and turned on in an initial period of a sustain period, And turning on the fourth switching device to a predetermined time point before the second address section of the first address section and turning off the remaining period of the first address section, the second address section, and the sustain period. The method of claim 13, And the initial period of the sustain period is a period in which a first voltage is applied to the X electrodes. A panel in which discharge cells are formed in a region where the address electrodes intersect with respect to the pair of sustain electrodes in which the X electrodes and the Y electrodes are alternately arranged side by side; And an electrode driver for outputting a driving signal to the electrodes and including an energy recovery circuit. The frame as the display period includes a plurality of subfields for time division gray scale display, each subfield including a reset period, an address period, and a sustain period, The address period includes a first address period for maintaining and biasing the X electrodes and a second address period for applying a voltage of a ramp pulse waveform continuously falling from the second voltage to the first voltage. and, And applying the voltage of the ramp pulse waveform in the second address section by the energy recovery circuit. The method of claim 15, The energy recovery circuit includes an energy storage for storing charges from the panel, a first switching element for controlling the application of charges stored in the energy storage to the panel, and a charge for storing the charges in the panel in the energy storage. A second switching element for controlling the And driving the second switching device in the second address period. The method of claim 16, And the second switching element is turned on even when the first voltage is applied to the Y electrodes at the beginning of the sustain period. The method of claim 15, The electrode driver is connected to a first voltage source, the first voltage source to control the output of the first voltage to the X electrodes, a second voltage source, and the second voltage source to be connected to the second voltage source. A fourth switching element for controlling output to the X electrodes, The third switching device is turned off in an address period and turned on in an initial period of a sustain period, And turning on the fourth switching device to a predetermined time point before the second address section of the first address section and turning off the remaining period of the first address section, the second address section, and the sustain period. The method of claim 18, The initial period of the sustain period is a period in which the first voltage is applied to the X electrodes.

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