KR100670363B1 - Apparatus for driving plasma display panel - Google Patents

Abstract

An apparatus for driving a plasma display panel is provided to integrate a sustain electrode driving board into one board by using a single positive voltage source, when a sustain electrode is biased at a ground voltage or a sustain voltage. An apparatus for driving a plasma display panel(PDP) includes a power recovery sustain driving circuit(30), which recovers reactive power of the PDP through a first electrode. The power recovery sustain driving circuit includes a sustain discharge unit(31), a panel charging/discharging unit(32), and a floating capacitor charging unit. The sustain discharge unit outputs a first or second voltage to the PDP by using a boot strap process of a storage element, which stores a sustain voltage. The panel charging/discharging unit charges the panel to the first voltage or discharges the panel to the second voltage. The floating capacitor charging unit maintains the voltage of the storage element to the sustain voltage during an initial start-up or a panel driving process.

Description

Apparatus for driving plasma display panel

1 is a partial perspective view of an AC plasma display panel.

2 is an arrangement diagram of electrodes of a plasma display panel.

3 is a schematic plan view of an existing chassis base.

4 is a schematic plan view of a chassis base for a conventional integrated board implementation.

5 is an electrode arrangement diagram of a plasma display panel for implementing a conventional integrated board.

FIG. 6 is a diagram illustrating a full-wave driving waveform for implementing an integrated board. FIG.

FIG. 7 is a schematic circuit diagram of a conventional driving circuit which generates the sustain discharge driving waveform of FIG. 6.

FIG. 8 is a schematic circuit diagram of another existing driving circuit which generates the sustain discharge driving waveform of FIG. 6.

9 is a schematic plan view of a chassis base according to an embodiment of the present invention.

10A and 10B are circuit diagrams of a power recovery sustain circuit according to an embodiment of the present invention.

11A to 11H are diagrams showing an operation mode of the power recovery sustain circuit shown in FIGS. 10A and 10B, respectively.

FIG. 12 is a diagram illustrating operation timings of FIGS. 10A and 10B.

13 is a full-circuit circuit diagram for generating the waveform of FIG. 6 in accordance with an embodiment of the present invention.

14A to 14C are diagrams illustrating the operation of the circuit of FIG. 13 in an initialization period.

14D and 14E illustrate the operation of the circuit of FIG. 13 in a write section.

15 is an equivalent circuit of the power recovery sustain circuit when charging the floating capacitor of FIGS. 10A and 10B or 12 according to an exemplary embodiment of the present invention.

16A and 16B illustrate an operation mode of a power recovery sustain circuit during charging of the floating capacitor illustrated in FIG. 15.

17 is a diagram illustrating an operation timing when charging a floating capacitor according to an exemplary embodiment of the present invention.

18 is an equivalent circuit of a power recovery sustain circuit when charging the floating capacitor of FIGS. 10A and 10B or 12 according to another embodiment of the present invention.

19A to 19C are diagrams illustrating an operation mode of a power recovery sustain circuit during charging of the floating capacitor illustrated in FIG. 18.

20 is a view showing an operation timing when charging a floating capacitor according to another embodiment of the present invention.

21 is a circuit diagram of a power recovery sustain driving circuit according to another embodiment of the present invention.

22 is a diagram illustrating an operation timing of FIG. 21.

The present invention relates to a driving device of a plasma display panel, and more particularly, to a power recovery sustain driving circuit, and in particular, a sustain driving unit through which most of the gas discharge current flows during emission, and the energy accumulated in the panel can be recovered and administered again. It relates to a panel charging and discharging unit that can be.

A plasma display panel is a flat panel display that displays characters or images using a plasma generated by gas discharge, and tens to millions or more pixels are arranged in a matrix form according to their size. The plasma display panel is classified into a direct current type and an alternating current type according to a shape of a driving voltage waveform applied and a structure of a discharge cell.

In the DC plasma display panel, since the electrode is exposed to the discharge space as it is, the current flows in the discharge space while the voltage is applied. On the other hand, the AC plasma display panel has a dielectric structure covering the electrodes to form a structural capacitance component, so that the current is limited when the driving voltage is applied and the electrode is protected from the impact of ions during gas discharge. have.

In the AC plasma display panel, as illustrated in FIG. 1, a scan electrode 4 and a sustain electrode 5 covered with a dielectric layer 2 and a protective layer 3 are arranged in parallel on the first glass substrate 1. A plurality of address electrodes 8 covered with the insulator layer 7 are provided on the second glass substrate 6. On the insulator layer between the address electrodes, barrier ribs 9 are formed in parallel with the address electrodes. In addition, phosphors 10 are formed on the surface of the insulator layer 7 and on both side surfaces of the partition wall 9. The first glass substrate 1 and the second glass substrate 6 have a discharge space 11 therebetween so that the scan electrode 4 and the address electrode 8 and the sustain electrode 5 and the address electrode 8 are orthogonal to each other. They are arranged to face each other. The discharge space at the intersection of the scan electrode 4 and the sustain electrode 5 paired with the address electrode 8 forms the discharge cell 12.

2 shows an electrode arrangement diagram of the plasma display panel 13.

As shown in FIG. 2, the electrodes have a matrix configuration of m × n. Specifically, the address electrodes A ₁ to A _m are arranged in the column direction and n rows of the scanning electrodes Y ₁ in the row direction. Y _n ) and sustain electrodes X ₁ to X _n are arranged in a zigzag pattern. The discharge cell 12 shown in FIG. 2 corresponds to the discharge cell 12 shown in FIG.

In general, in the method of driving an AC plasma display panel, one frame is divided into a plurality of subfields to be driven, and each subfield includes an initialization (reset) period, a write (address) period, and a sustain (sustain) period.

The initialization period is a period of initializing the state of each cell in order to perform an addressing operation smoothly on the cell, and the writing period is a wall charge on the cell (addressed cell) that is turned on by selecting a cell that is turned on and a cell that is not turned on. This is the period during which the stacking operation is performed. The sustain period is a period in which discharge for actually displaying an image on the addressed cells is performed. In order to perform this discharge sustain operation, sustain discharge pulses should be applied to the scan electrodes and sustain electrodes alternately.

3 is an exploded perspective view of the plasma display device.

As shown in FIG. 3, the chassis base 14 is disposed on an opposite surface on which an image of the plasma display panel 13 is displayed to be coupled to the plasma display panel. The chassis base 14 is provided with boards 15-19 necessary for driving the plasma display panel 13. The address board 15 is formed under the chassis base 14 and may be formed of a single board or a plurality of boards. Such an address board 15 applies a voltage for selecting discharge cells to be displayed to receive the address driving control signal from the image processing and controlling board 16 on the address electrodes (A ₁ ~ A _m). The scan driving board 17 is disposed on the left side of the chassis base 14 to maintain and apply a voltage to the scan electrodes Y ₁ to Y _n to sequentially select the scan electrodes Y ₁ to Y _n during the writing period. In the section, sustain discharge pulses are applied to the scan electrodes Y ₁ to Y _n . The sustain driving board 18 is disposed on the right side of the chassis base 14 to receive driving signals from the image processing and control board 16 in the sustain section, and apply sustain discharge pulses to the sustain electrodes X ₁ to X _n . . Image processing and controlling board 16 to the address electrode receiving the image signal (A ₁ ~ A _m), the necessary control signal and the scan and sustain the driving electrodes _{(Y 1 ~ Y n, X} 1 ~ X n) driven from the outside The necessary control signals are generated and applied to the address driving board 15, the scan driving board 17, and the sustain driving board 18, respectively. The power supply board 19 supplies power for driving the plasma display device. The image processing and control board 16 and the power board 17 are located at the center of the chassis base.

As shown in FIG. 3, the scan driving board 17 for driving the scan electrode and the sustain driving board 18 for driving the sustain electrode for the discharge sustain operation of the plasma display panel 13 are the scan electrodes 4. And sustain electrodes 5 respectively. As such, if the driving board is separately present, the unit cost as well as the mounting problem increases.

In order to solve this problem, as shown in FIG. 4, the integrated board 20 made by combining two driving boards is disposed on the left side of the chassis base 14 so that the scan electrode is directly connected to the integrated board, and the sustain electrode is a copper plate having a large area. A method of extending to 21 and connecting to the integrated board has been proposed. However, simply integrating the two driving boards in this manner may have a large difference between the impedance seen by the sustain electrode and the impedance seen by the scan electrode in the extended drive board 10, thereby affecting the gas discharge characteristics.

5 is an electrode arrangement diagram of the plasma display panel 22 in which the electrode arrangement is modified to implement the integrated board. Existing external connecting connectors of the scan electrode and the sustain electrode are disposed on the left and right sides of the plasma display panel, respectively, to the left side of the panel. Therefore, even if the integrated board is disposed on the left side of the chassis base 14, there is no difference in impedance seen by the scan and sustain electrodes from the driving board. However, since the electric field of the sustain discharge voltage waveform is weak in the right part of the panel, an image displayed on the plasma display panel is not uniform.

Therefore, in order to solve the problem, as shown in FIG. 6, the difference in driving waveforms applied to the scan electrode and the sustain electrode in the initialization section, the recording section, and the sustain section is applied to the scan electrodes without changing the electrode arrangement of the plasma display panel. And a driving method for biasing the sustain electrode to a constant voltage has been proposed. In particular, a driving circuit capable of applying the bipolar sustain discharge voltage to the scan electrode even when only a positive power source is applied by applying the bootstrapping method using the floating capacitor 23 in the sustain period is proposed as shown in FIG. 7. The circuit of FIG. 7 does not need a separate negative power source and has the same advantages as the method of mounting a conventional driving board on each of the electrodes. However, due to the large and complex circuit elements, there is a problem in reliability and productivity.In particular, inrush current is generated when charging the voltage of the floating capacitor 23 which decreases momentarily during initial start-up as well as during gas discharge. It will cause interference problems.

8 illustrates a driving circuit in which floating capacitors are removed using a bipolar power source as an input power source of a sustain discharge circuit to solve this problem. Simple circuit structure improves reliability and productivity, but a negative power source is required so that the existing power supply cannot be used as it is, so instead of removing the floating capacitor from the circuit of FIG. You lose. In addition, the voltage stress of the active element used is doubled compared to the circuit of FIG.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a driving apparatus for a plasma display panel which can apply a bipolar discharge sustain pulse to a scan electrode using only a positive power supply while biasing a sustain electrode at a constant voltage. will be.

In particular, the present invention is to provide a driving device and a driving method of a plasma display panel having a low number of elements and a simple structure even when implementing an integrated board using only a positive power source. Another object of the present invention is to provide a driving apparatus and a driving method of a plasma display panel capable of applying a stable negative voltage without generating an inrush current to generate a negative sustain voltage.

In order to achieve the above objects and other objects, the present invention provides a plurality of first electrodes and second electrodes extending in parallel with each other, and a plurality of third electrodes extending across the plurality of first electrodes and second electrodes. A driving apparatus of a plasma display panel including an electrode and driving a plasma display panel in which discharge cells are defined in an intersecting area,

The driving apparatus of the plasma display panel includes a power recovery sustain driving circuit for recovering and reusing the reactive power of the panel through the first electrode.

The power recovery sustain driving circuit may include a sustain discharge unit configured to output a first voltage or a second voltage to a panel using a bootstrap operation of a reservoir in which a sustain voltage is stored; A panel charge / discharge unit configured to charge the panel voltage to a first voltage or to discharge the panel voltage to a second voltage; And a floating capacitor charging unit which maintains a voltage of a reservoir lowered by a gas discharge current at a sustain voltage at initial startup or when light is emitted from the panel.

According to another aspect of the present invention, the sustain discharge unit, the sustain voltage source; A first switching element electrically connected between the sustain voltage source and the panel; A second switching element having one end electrically connected to a contact point of the first switching element and the panel; A floating capacitor having one end electrically connected to the other end of the second switching element; Ground terminal; And a third switching element connected between the floating capacitor and the ground terminal,

The first voltage is applied to the panel by the turn-on of the first switching element, and the bootstrap operation of the floating capacitor in which the holding voltage is stored is turned on by the turn-on of the third switching element to generate the second voltage, and by the turn-on of the second switching element. The second voltage is applied to the panel.

According to another aspect of the present invention, the panel charging and discharging unit, the third switching element connected in series between the ground terminal and the panel; And a fourth switching element and an inductor, and the third and fourth switching elements are turned on to cause the inductor and the panel to resonate to discharge the voltage of the panel to the second voltage or to charge the first voltage.

According to another feature of this invention, the floating capacitor charging unit, the first switching element; Inductors; A fourth switching element; A third switching element; And a first diode electrically connected between one end of the floating capacitor and the ground terminal, and after the first, third, and fourth switching elements are turned on to accumulate magnetic energy in the inductor, the third switching element is turned on. Off, the accumulated magnetic energy is supplied to the floating capacitor to maintain the voltage of the floating capacitor at the sustain voltage.

According to another aspect of the present invention, the panel charging and discharging unit, a second diode electrically connected between the other end of the floating capacitor, the holding voltage source and the contact of the first switching element; And a third diode electrically connected between the contact point of the inductor and the fourth switching element and the contact point of the floating capacitor and the second switching element, wherein the second diode and the third diode, after the end of the charging or discharging, the panel It sets the path of the reflux current flowing through the inductor, in which the direction of the gas discharge current from the current is opposite.

According to this still further feature of the present invention, the path of the reflux current during charging passes through the third switching element, the fourth switching element, the inductor and the first switching element, and the path of the gas discharge current during charging is the first Pass the switching element and panel.

According to still another aspect of the present invention, the path of the reflux current during discharge passes through the inductor, the internal diode of the fourth switching element, the floating capacitor, and the second switching element, and the path of the gas discharge current during discharge, Passes through the panel, the second switching element, the stray capacitor and the third switching element.

According to another aspect of the present invention, the floating capacitor charging unit, after the first and fourth switching element is turned on and the third switching element is turned off, the fourth switching element is turned on and the third and fourth switching element. Is turned off to further supply the magnetic energy stored in the inductor to the floating capacitor via the internal diode, the inductor and the fourth switching element of the second switching element.

The present invention also includes a plurality of first electrodes and a second electrode extending in parallel with each other, and a plurality of third electrodes extending to intersect with the plurality of first electrodes and the second electrode in order to achieve the above object. A driving apparatus of a plasma display panel for driving a plasma display panel in which discharge cells are defined in an intersecting area,

 The driving apparatus of the plasma display panel includes a power recovery sustain driving circuit for recovering and reusing reactive power of the panel through the first electrode.

The power recovery sustain drive circuit includes a sustain voltage source; A first switching element having one end connected to the sustain voltage source; A second switching element having one end connected to the other end of the first switching element; Ground terminal; A third switching element, a fourth switching element, and an inductor connected in series between a ground terminal and a contact point of the first switching element and the second switching element; A first diode connected between the ground terminal and the second switching element; And a floating capacitor connected between the contacts of the first diode and the second switching element and the contacts of the third switching element and the fourth switching element.

According to another aspect of the present invention, the power recovery sustain driving circuit supplies a first voltage to the panel by turning on the first switching element, and stores the sustain voltage from the sustain voltage source by turning on the third switching element. The capacitor performs a bootstrap operation to generate a second voltage and supplies the second voltage to the panel by turning on the second switching element, and the inductor and the panel resonate with each other by turning on the third fourth switching element. The first voltage is charged or the second voltage is discharged, and the first, third and fourth switching elements are turned on to accumulate magnetic energy in the inductor, and then the third switching element is turned off to supply the accumulated magnetic energy to the floating capacitor. To keep the voltage on the stray capacitor at a sustain voltage.

According to still another aspect of the present invention, the power recovery sustain driving circuit includes a second diode connected between the contacts of the third switching element and the fourth switching element, and the contact of the sustain voltage source and the first switching element; And a third diode connected between the contact point of the second switching element and the first diode and the contact point of the inductor and the fourth switching element, wherein the second diode and the third diode are gas generated from the panel during charging or discharging. Determine the path of the reflux current flowing in the opposite direction to the discharge current.

According to another aspect of the present invention, the power recovery sustain driving circuit, the fifth switching element is connected between the contact point of the third switching element and the fourth switching element, and the contact of the sustain voltage source and the first switching element; And a third diode connected between the contact point of the second switching element and the first diode and the contact point of the inductor and the fourth switching element, wherein the internal diode and the third diode of the fifth switching element are configured to be a panel during charging or discharging. The path of the reflux current flowing in the opposite direction to the gas discharge current generated from

According to another aspect of the present invention, the plasma display panel is driven by being divided into an initialization period for initializing a discharge cell, a recording period for selecting a cell that is turned on and a cell that is not turned on, and a sustain period for performing discharge in the cell that is turned on. ,

The driving apparatus of the plasma display panel further includes an erase pulse applying unit applying an erase pulse, a rising pulse applying unit applying a rising pulse, and a falling pulse applying unit applying a falling pulse during an initialization period, and during a recording period, The apparatus may further include a scan pulse applying unit applying a scan pulse having a scan voltage and a low scan voltage.

According to another aspect of the present invention, the rising pulse applying unit, the first node which is a contact point of the first switching element and the second switching element, and the sixth switching element connected between the second node; A second capacitor connected between the first node and the rising voltage source; A seventh switching element connected between the second capacitor and the rising voltage source and the second node; And an eighth switching element connected between the second node and the third node, wherein the first, seventh, and eighth switching elements are turned on and the sixth switching element is turned off, from the sustain voltage from the sustain voltage source. The rising pulse gradually rising by the rising voltage from the rising voltage source is output to the third node.

According to another feature of the present invention, the falling pulse applying unit, the falling lowest voltage source; And a ninth switching element connected between the third nodes, wherein the ninth switching element is turned on and outputs a falling pulse to the third node to gradually fall down to the falling minimum voltage from the falling lowest voltage source.

According to another aspect of the present invention, the erase pulse applying unit, the erase voltage source; And a tenth switching element connected between the third nodes, wherein the tenth switching element is turned on and outputs to the third node an erase pulse which is gradually lowered to the erase voltage from the erase voltage source.

According to another aspect of the present invention, the scanning pulse applying unit, a low scan voltage source; An eleventh switching element connected between the row scan voltage source and the third node; A third capacitor connected between the third node and the high scan voltage source; And a scan switching unit connected between a contact point of the high scan voltage source and the third capacitor and the third node, the scan switching unit comprising a twelfth switching element and a thirteenth switching element, wherein the eleventh and twelfth switching elements are turned on to be high. The high scan voltage from the scan voltage source is output to the panel, and the thirteenth switching element is turned on to output the low scan voltage from the low scan voltage source to the panel.

According to another aspect of the present invention, the sustain discharge unit, the sustain voltage source; A first switching element electrically connected between the sustain voltage source and the panel; Ground terminal; A second switching element electrically connected between the panel and the ground terminal; A floating capacitor electrically connected between the ground terminal and the sustain voltage source; And a third switching element electrically connected between both ends of the floating capacitor, wherein the floating capacitor stores the sustain voltage from the sustain voltage source by turning on the third switching element to generate a first voltage. One voltage is applied to the panel by turning on the first switching element, and a second voltage, which is a ground voltage, is applied to the panel by turning on the second switching element.

According to another aspect of the present invention, the panel charging and discharging unit, the third switching element connected in series between the sustain voltage source and the panel; And a fourth switching element and an inductor, and the turn-on of the third switching element and the fourth switching element causes the inductor and the panel to resonate to discharge the panel voltage to the second voltage or to charge the first voltage. .

According to another feature of the present invention, the floating capacitor charging unit, the second switching element; Inductors; A fourth switching element; A third switching element; And a first diode electrically connected between one end of the floating capacitor and the sustain voltage source. After the second to fourth switching elements are turned on to accumulate magnetic energy in the inductor, the third switching elements are turned off. In addition, the accumulated magnetic energy is supplied to the floating capacitor to maintain the voltage of the floating capacitor at the sustain voltage.

According to another aspect of the present invention, the ground voltage is constantly applied to the second electrode, the first voltage may be a positive sustain voltage, and the second voltage may be a negative sustain voltage.

According to another aspect of the present invention, a positive sustain voltage is constantly applied to the second electrode, and the first voltage may be a voltage having a magnitude twice that of the sustain voltage.

According to another aspect of the present invention, the power recovery sustain driving circuit includes a first step of turning on the first and fourth switching elements, the voltage applied to the panel is maintained at the first voltage; A second step in which the first, third and fourth switching elements are turned on to accumulate magnetic energy in the inductor; A third step of turning on the third and fourth switching elements to recover energy accumulated in the panel by resonance of the inductor and the panel; A fourth step in which the second and third switching elements are turned on so that a reflux current in a direction opposite to the gas discharge current from the panel flows through the inductor; A fifth step in which the second to fourth switching devices are turned on to accumulate magnetic energy in the inductor; A sixth step in which the third and fourth switching elements are turned on to recover energy accumulated in the panel by resonance of the inductor and the panel; A seventh step in which the first, third and fourth switching elements are turned on so that a reflux current in a direction opposite to the gas discharge current from the panel flows through the inductor; And an eighth step of turning on the first and fourth switching elements to maintain the voltage applied to the panel at the first voltage.

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

9 is a schematic plan view of a chassis base according to an embodiment of the present invention.

Referring to the drawings, the plasma display device of the present invention includes a plasma display panel 24, a chassis base 25, an address board 26, a scan-maintaining integrated board 27, a power board 28, and image processing. Control board 29. The plasma display panel 24 includes a plurality of address electrodes arranged in a column direction and a plurality of scan electrodes and sustain electrodes arranged in a row direction. The address board 26 disposed at the bottom of the chassis base 25 receives an address driving control signal from the image processing and control board 29 and applies an image data signal to each address electrode to select a discharge cell to be displayed. do. The scan-maintenance integrated board 27 is disposed on the left side of the chassis base 25 so as to sequentially select the scan electrodes Y ₁ to Y _{n in the} reset period and the reset waveform for initializing the cells of the panel in the initialization period. applying a voltage to the scan electrodes (Y ₁ ~ Y _n) and the sustain period is applied to the positive polarity sustain pulse to the scan electrodes (Y ₁ ~ Y _n). The image processing and control board 29 receives an image signal from the outside, generates an address driving control signal and a sustain discharge signal, and applies them to the address board 26 and the scan-hold integrated board 27, respectively. The power board 28 supplies power required for driving the plasma display device. The image processing and control board 29 and the power board 28 are located on the right side of the chassis base 25.

The scan-maintenance integrated board 27 according to the embodiment of the present invention includes a power recovery sustain driving circuit which is a circuit for recovering and reusing reactive power. 10A and 10B. 10A and 10B show a power recovery sustain driving circuit of the same embodiment in order to separately describe each functional part of the circuit.

10A and 10B, the power recovery sustain driving circuit 30 according to the embodiment of the present invention includes a sustain discharge unit 31, a panel charge and discharge unit 32, and a floating capacitor charge unit 33. .

The sustain discharge part 31 is connected to a sustain voltage source V _S or a ground terminal, and includes first to third switching elements M ₁ , M ₂ , M ₃ and floating capacitors each formed of a MOSFET or an IGBT having an internal diode. C ₁ ). Voltage between both ends of the panel capacitor (C _P) (v _Cp) is maintained at the positive sustain voltage (V _S) or the negative sustain voltage (-V _S) by the switching operation of these floating capacitor and the three switching elements.

All panels chungbang 32 first and the panel capacitor (C _P), voltage (V _Cp) rises to or panel capacitor (C _P) and an inductor connected in series between the ground terminal (L ₁₎ in order to lower the 3 to And fourth switching elements M ₄ , M ₃ . In addition, the panel charging and discharging unit 32 according to an exemplary embodiment of the present invention has a second to third diode which sets a path of the reflux current flowing through the inductor L ₁ when the panel capacitor C _P is charged or discharged. (D ₂ , D ₃ ). The panel charge / discharge unit 32 serves to charge or discharge the voltage V _Cp of the panel capacitor C _P to the positive sustain voltage V _S or to the negative sustain voltage V _S.

The floating capacitor charging unit 33 includes the first switching element M ₁ of the sustain discharge unit 31, the floating capacitor C ₁ , the inductor L ₁ of the panel charging and discharging unit 32, and the third and fourth switching elements. A first diode D ₁ sharing a (M ₃ , M ₄ ) and connected in series between a floating capacitor C ₁ connected to a contact between the third and fourth switching elements M3 and M4 and a ground terminal. It includes. The floating capacitor charging unit 33 maintains the voltage V _C1 of the floating capacitor C ₁ , which is lowered by the gas discharge current at the time of initial startup or panel emission, to the sustain voltage V _S.

11A to 11H are diagrams showing an equivalent circuit and a current path in each mode according to an embodiment of the present invention, and FIG. 12 is a diagram showing an operation timing diagram according to an embodiment of the present invention.

Next, a driving method of the plasma display panel according to an exemplary embodiment of the present invention will be described with reference to FIGS. 11A through 11F and 12.

It is assumed that the voltage V _C1 of the floating capacitor C ₁ is already charged with the sustain voltage V _S and that the value is so large that there is no change in the voltage V _C1 of the floating capacitor even when the gas discharge current flows.

Mode 0 (before t ₀ )-see FIG. 11A: The first switching element M ₁ is turned on to maintain the voltage across the panel at the sustain voltage V _S. The fourth switching element M ₄ is also turned on to maintain the voltage of the inductor L ₁ at 0V.

Mode 1 (t ₀ to t ₁ )-see FIG. 11B: When the third switching device M ₃ is turned on while the first and fourth switching devices M ₁ and M ₄ are still conducting, the mode 1 is turned on. Begins. During t ₀ to t ₁ , the current of the inductor L ₁ increases linearly with the slope of V _S / L ₁ while the first switching element M ₁ , the inductor L ₁ , and the fourth switching element M ₄ And flow through the third switching device M ₃ . At this time, the current i _L1 of the inductor L ₁ is as shown in Equation 1 below.

During this mode, the energy recovery inductor L ₁ accumulates enough magnetic energy to completely change the voltage across the panel from V _S to -V _S.

Mode 2 (t ₁ to t ₂ )-see FIG. 11C: Mode 2 starts when the first switching device M ₁ is turned off while the third and fourth switching devices M ₃ and M ₄ are still on. . A series resonant circuit consisting of an inductor (L ₁ ) and a panel (C _P ) with a bias of 0 V is formed so that v _ds1 (t ₁ ) = 0V, v _ds2 (t ₁ ) = 2V _S , v _Cp (t ₁ ) = V _S and i _L1 (t ₁ ) = (V _S / L ₁ ) ΔT and ΔT = t ₁ -t ₀ are resonated to initial values to recover and administer the energy stored in the panel. At this time, the panel capacitor _Cp current voltage v i of _Cp (t) and the panel capacitor (C _P) (t) in the (C _P) is given by the following equation (2).

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t ₂ before v _Cp is fixed to -V _S a second output capacitor of the switching elements (M ₂₎ are completely discharge the second switching element (M ₂₎ both-end voltage falls to 0V.

Mode 3 (t ₂ to t ₃ )-see FIG. 11D: Mode 3 starts when the second switching element M ₂ is turned on. Zero voltage switching is performed because the voltage across both of the second switching elements M ₂ is the same. At the same time, the fourth switching device M ₄ is turned off. The current i _L1 of the energy recovery inductor L ₁ decreases with the slope of −V _S / L ₁ , while the inductor L ₁ , the internal diode of the fourth switching element M ₄ , the floating capacitor C ₁ And flow through the second switching element M ₂ . The inductor current i _L1 is given by Equation 3 below.

At the same time, the gas discharge current i _Dis flows through the panel to the second switching element M ₂ , the floating capacitor C ₁ , and the third switching element M ₃ to emit the PDP. Therefore, since the flow direction of the reflux current i _L1 and the gas discharge current i _Dis of the inductor L ₁ is opposite to each other, a slight gas is reduced while reducing the current stress of the switching element, especially the second switching element M ₂ . Compensate for the discharge current. When the current i _L1 of the energy recovery inductor becomes 0A after the ΔT time, the third diode D ₃ clamps the voltage across the inductor L ₁ . During mode 3, the panel voltage is held at -V _S.

Mode 4 (t ₃ to t ₄ )-see FIG. 11E: Mode 4 starts when the fourth switching device M ₄ is turned on. As the voltage of the floating capacitor C ₁ is applied across the inductor L ₁ , energy for completely recovering the energy stored in the panel is accumulated in the inductor L ₁ . At this time, the recovery inductor current i _L1 is given by Equation 4 below.

Mode 5 (t ₄ to t ₅ )-See FIG. 11F: Mode 5 starts when the second switching device M ₂ is turned off while the third and fourth switching devices M ₃ and M ₄ are still on. The basic operation is the same as in mode 2. At this time, the panel voltage v _Cp (t) and the displacement current i _Cp (t) of the panel capacitance are given by Equation 5 below.

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t v before _{5 Cp} is the output capacitor of the first switching element (M ₁₎ is fixed to V _S are completely drained first switch (M ₁₎ both-end voltage falls to 0V.

Mode 6 (t ₅ to t ₆ )-see FIG. 11G: Mode 6 begins when the first switching element M ₁ is turned on at zero voltage. The current i _L1 of the energy recovery inductor decreases with the slope of V _S / L ₁ while the third and fourth switching elements M ₃ and M ₄ , the inductor L ₁ , and the first switching element M ₁ It flows through the internal diode of input power (Vs). The inductor current i _{L1 at} this time is given by Equation 6 below.

At the same time, the gas discharge current i _Dis flows to the panel via the first switching element M ₁ to emit the PDP. Therefore, since the inductor current i _L1 and the gas discharge current i _Dis flow in opposite directions, the current stress of the switching element, in particular the first switching element M ₁ , is reduced and energy of the gas discharge current i _Dis is reduced. It is supplied from the recovery inductor L ₁ . Mode 6 ends when the inductor current i _L1 reaches 0A.

Mode 7 (t ₆ to t ₇ )-See FIG. 11H: Mode 7 starts when the third switching element M ₃ is turned off as the inductor current i _L1 becomes 0A. During the mode 7, the panel voltage is continuously maintained at V _S and the gas discharge current i _Dis flows through the first switching element M ₁ .

FIG. 13 is a schematic circuit diagram of a full-section drive circuit (scan-maintenance integrated board) 27 including a power recovery sustain drive circuit 30 to generate the drive waveform of FIG. 6. The entire section driving circuit can be broadly divided into a power recovery sustain driving circuit 30, an initialization circuit 36, and a selection circuit 38.

The initialization circuit 36 is a circuit for applying an erase pulse, a rising pulse and a falling pulse to the panel during the initialization section, and the selection circuit 38 is a circuit for applying a scanning pulse to the panel during the writing section, and the power recovery sustain driving circuit ( 30 is a circuit for applying a sustain pulse to the panel during the sustain period and recovering and reusing the reactive power of the panel.

The initialization circuit 36 includes an erase pulse applying unit, a rising pulse applying unit, and a falling pulse applying unit. The rising pulse applying unit includes a rising voltage source Vset, a sixth switching element M6, a seventh switching element M7, and a second capacitor C2. The rising pulse applying unit is connected to the second capacitor C2 between the first node N1, which is a contact point of the first switching element M1 and the second switching element M2, and the rising voltage source Vset, The sixth switching element M6 is connected between the N1 and the second node N2, and the contact point of the rising voltage source Vset and the second capacitor C2 of the second capacitor C2 and the third diode D3 is connected. And a seventh switching element M7 is connected between the second node N2. In order to apply the rising pulse, while the first switching device M1 is turned on, the sixth switching device M6 is turned off, and the rising voltage Vset is charged to the second capacitor C2, and the sustain voltage is applied. The rising pulse gradually rising from Vs to the rising maximum voltage Vset + Vs is output to the second node N2 through the seventh switching element M7. The rising pulse output to the second node is transmitted to the third node N3 through the eighth switching element M8. The falling pulse applying unit includes a falling lowest voltage source (-Vnf-V _B ) and a ninth switching element M9. The falling pulse is output to the third node N3 by the turn-on of the ninth switching element M9 connected to the falling lowest voltage source -Vnf-V _B. The erase pulse applying unit includes an erase voltage source (-Ve) and a tenth switching element M10. The erase pulse is output to the third node N3 by the turn-on of the tenth switching element M10 connected to the erase voltage source -Ve.

The selection circuit 38 includes a scan switching unit 34, a high scan voltage source V _{SC_H} -V _B , a low scan voltage source -V _{SC_L} -V _B , an eleventh switching element M11, and a third capacitor C3).

The eleventh switching element M11 is connected between the low scan voltage source (-V _{SC_L} -V _B ) and the third node N3, and the low scan voltage (-V _{SC_L} −) is turned on by the turn-on of the eleventh switching element M11. V _B ) is output to the third node N3. Between the third node N3 and the high scan voltage source V _{SC_H} -V _B , a third capacitor C3 is connected, and the contact point of the third capacitor C3 and the high scan voltage source V _{SC_H} -V _B. The scan switching unit 34 is connected between the fourth node N4. The scan switching unit 34 is formed by connecting the twelfth switching element M12 and the thirteenth switching element M13, and the high scan voltage V _{SC_H} -V _B is turned on by the twelfth switching element M12. The panel Cp is applied to the panel Cp through the fourth node N4, which is a contact point between the twelfth switching element M12 and the thirteenth switching element M13. The low scan voltage (-V _{SC_L} -V _B ) output to the third node N3 by _turning on the thirteenth switching element M13 is applied to the panel Cp, that is, the scan electrode through the fourth node N4. do. The third capacitor C3 stores the difference V _{SC_H} + V _{SC_L} between the low scan voltage (-V _{SC_L} -V _B ) and the high scan voltage V _{SC_H} -V _B to fix the difference. On the other hand, the sixth and eighth switching elements (M ₆ , M ₈ ) disposed on the main path, the switching elements (M1 ~ M4) of the power recovery sustain drive circuit 30 is malfunctioning in the initialization period and the writing period Prevent it.

The power recovery sustain driving circuit 30 is shown in FIG. 10A and FIG. 10B, except that the fifth switching element M ₅ including an internal diode is used instead of the second diode D2 of FIGS. 10A and 10B. Connected. As shown in the drawing, the internal diode of the fifth switching element M _{5 is} referred to as D 2. The role of the fifth switching element M ₅ serves to make the voltage of the main path, that is, the first node to the third node N1 to N3, as the ground voltage. Such ground voltages of the first to third nodes N1 to N3 are applied to the scan electrode Y of the panel before the erase period of FIG. 6, before the fall period, and before the sustain pulse is applied in the sustain period. Will be. Forming a ground voltage on the main path is as shown in (3) of FIG. 14A. As described above, since the fifth switching element M5 is disposed between the sustain voltage source Vs of the power recovery sustain driving circuit 30 and the floating capacitor C1, the third node N3 in the full period driving circuit 27. ), There is no need for a separate ground terminal and a switching element connected to the ground terminal, thereby reducing the manufacturing cost.

Hereinafter, a method of generating the driving waveform of FIG. 6 using the global driving circuit 27 of FIG. 13 will be described with reference to FIGS. 14A to 14E. It is assumed that the sixth, eighth, and thirteenth switching elements M ₆ , M ₈ , and M ₁₃ are turned on before FIG. 14A starts. The path formed through the panel, the thirteenth switching element M ₁₃ , the sixth and eighth switching elements M ₆ and M ₈ of the entire period driving circuit 27 of FIG. 14. Alternatively, the reverse path is referred to as the "main path", and the sixth, eighth, and thirteenth switching elements M ₆ , M ₈ , and M ₁₃ are turned on when the main path is formed.

14A to 14C are diagrams illustrating the operation of the circuit of FIG. 13 in the erase period, the rise period, and the fall period of the initialization section, respectively. 14D and 14E illustrate the operation of the circuit of FIG. 13 in a write period.

14A to 14E are diagrams illustrating current paths of respective modes in an initialization section and a writing section of a full-section driving circuit according to an exemplary embodiment of the present invention.

First, a method of generating driving waveforms in an erase period, a rise period, and a fall period of an initialization section will be described with reference to FIGS. 14A to 14C.

Referring to FIG. 14A, firstly, the second switching device M2 is turned on so that 0 V is applied to the scan electrode Y through the main path (1). Subsequently, the eighth switching element M ₈ of the main path is turned off and the tenth switching element M ₁₀ is turned on so that an erase pulse is applied to the scan electrode Y of the panel. That is, the voltage of the scan electrode Y gradually decreases, and the voltage of the scan electrode becomes -V _B (2). Subsequently, when the tenth switching element M10 is turned off and the eighth switching element M8 and the second and fifth switching elements M2 and M5 of the main path are turned on, a ground voltage (0V) is applied to the panel (3). .

Next look at Figure 14b, is applied to the holding voltage (V _S) to the first switching element scan electrode (Y) via the main path on standing (M ₁₎ in the rising period (4). Then the first switching element (M ₁₎ the sixth switching element in a state that is on (M ₆₎ is turned off and the seventh switching element (M ₇₎ is standing on, keeping the voltage source (V _S), the first switching element (M _1, ), The second capacitor C ₂ ), the switching element M ₇ , the switching element M ₈ , and the scanning electrode Y of the panel capacitor C _P through the switching element M ₁₃ of the scan switching unit 34. A voltage is applied which gradually raises (5). At this time, the voltage of the scan electrode Y finally rises to the rising maximum voltage V _SET + V _S by the rising voltage V _set charged to the sustain voltage source V _S and the second capacitor C ₂ . .

Referring to FIG. 14c, the falling period of the setup period the seventh switching element (M ₇₎ turns off the first switching element holding voltage (V _S) (M ₁₎ is switched on via the main path, the voltage of the standing scan electrode (Y) Decreases. Subsequently, the first switching element M ₁ and the sixth switching element M ₆ are turned off and the ninth switching element M ₉ is turned on so that the voltage of the scan electrode gradually reaches the falling minimum voltage (-V _nf -V _B ). Descend.

As described above, the waveform in the initialization section including the erasing period, the rising period, and the falling period can be applied to the scan electrode Y through FIGS. 14A to 14C.

Next, a method of generating a driving waveform in the writing section will be described with reference to FIGS. 14D and 14E.

Referring to FIG. 14d, the write period, the ninth switching element ₍₉ M) 11 is turned off and the switching elements (M ₁₁₎ and a scan stand a switching element (M ₁₂₎ of the switching unit 34 is turned on, a low scan voltage (-V through the path of _{SC_L} -V _B) and a high scan voltage (V _B -V _{SC_H)} difference (V + V _{SC_H SC_L),} the voltage charged in the third capacitor (C ₃₎ and twelfth switching elements (M ₁₂ in) of A high scan voltage V _{SC_H} -V _B is applied to the scan electrode Y (8). When the scan electrode Y is selected, the twelfth switching element M12 is turned off and the switching element M13 is turned on to apply a low scan voltage (-V _{sc_L} -V _B ) to the scan electrode (9). Subsequently, when another scan electrode is selected, the twelfth switching element M12 is turned on again to apply a high scan voltage (V _{sc_h} -V _B ) to the scan electrode (10).

In FIG. 14E, when the writing period ends, the eleventh switching element M11 is turned off and the second and fifth switching elements M2 and M5 are turned on to apply the ground voltage to the scan electrode Y (11). Subsequently, the fourth switching element M ₄ is turned on to store sufficient magnetic energy in the inductor L ₁ to raise the voltage of the scan electrode to the sustain voltage Vs (12). Next, when the second and fifth switching devices M ₂ and M ₅ are turned off while the fourth switching device M ₄ is continuously turned on, the ground terminal, the third switching device M ₃ , and the fourth switching device M ₄ are turned off. ), The scan electrode Y is raised to the sustain voltage V _S while supplying energy to the panel through the inductor L ₁ and the main path (13). When the voltage of the scan electrode becomes the sustain voltage V _S , the first switching device M ₁ is turned on to fix the scan electrode to the sustain voltage V _S (14).

In this manner, the low scan voltage (selection voltage, -V _{sc_L} -V _B ) can be applied to the scan electrodes Y sequentially selected in the writing period. The operation of the circuit of FIG. 13 in the sustain period is the same as that of FIGS. 11A through 11H through the main path, and thus, further description thereof will be omitted.

In order to briefly explain the operation of the proposed single driver circuit floating capacitor C ₁ goes by the capacitance is so large gas discharge current capacitor voltage is however assumed that there is no change in practice, Fig. 11d, so that the capacitance of the floating capacitor (C ₁₎ Co. As in mode 3 of FIG. 3, when the plasma display panel emits light and the gas discharge current flows through the floating capacitor C ₁ , a voltage drop ΔV occurs. Therefore, an operation for charging the floating capacitor C ₁ without inrush current is required. In addition, during the initial startup, an operation of charging the floating capacitor C ₁ voltage completely discharged to the holding voltage V _S without a surge current is required.

To this end, sufficient magnetic energy is accumulated in the inductor L1 by using the third switching element M ₃ in the portion where the first switching element M ₁ is large, as in the operation mode 7, in the initialization, recording period, and sustain period. The energy is supplied to the floating capacitor C ₁ to maintain the capacitor voltage at the sustain voltage V _S without charging surge current.

15 to 17 are views illustrating a method of charging the floating capacitor C ₁ when the main path is turned on, and FIGS. 18 to 19 show floating of the sixth switching element M ₆ on the main path. The peak value of the charging current of the capacitor C _{1 is} shown to be larger than the method of FIGS. 15 to 17.

Fig. 15 is a circuit when charging the floating capacitor C ₁ when the main path is turned on.

16A and 16B are diagrams illustrating each mode equivalent circuit and a current path of FIG. 15 during charging according to an embodiment of the present invention, and FIG. 17 is a diagram illustrating an operation timing diagram during charging according to an embodiment of the present invention.

In FIG. 15, since the first and fourth switching elements M ₁ and M ₄ are turned on and only the on resistance is shown, the parasitic resistance R _ESR connected in series with the inductor L ₁ and the third switching element M ₃ is approximated. It was. In addition, it is assumed that the floating capacitor (C ₁ ) has an initial value of V _S -ΔV.

Next, a floating capacitor charging method according to an exemplary embodiment of the present invention will be described with reference to FIGS. 16A, 16B, and 17.

Since the operation of charging the floating capacitor C ₁ in the initialization or recording section and the charging process in the mode 7 of FIG. 11H are the same, the charging method will be described by subdividing the mode 7 into the modes 7-1 and 7-2.

Mode 7-1 (t ₄ to t ₅ )-Referring to FIG. 16A: When the third switching device M ₃ is continuously turned on even when the current of the energy recovery inductor reaches 0A, the inductor L ₁ is represented by the following equation (7). As the current increases linearly, energy is accumulated.

In this case, the floating capacitor C ₁ is opened by the first diode D ₁ .

Mode 7-2 (t ₅ to t ₆ )-see FIG. 14B: Mode 7-2 starts when the third switching device M ₃ is turned off. The inductor current i _L1 is the capacitor C ₁ because the voltage of the capacitor C ₁ is less than the holding voltage V _S. And flow through the first diode D ₁ . At this time, the voltage across the inductor (L ₁ ) is given by the following equation (8).

v _L1 = V _S -v _C1 = V _S- (V _S -ΔV) = ΔV

Since ΔV is so small compared to V _S , approximating to 0V, the current in inductor (L ₁ ) is constant for mode 7-2. Therefore, the voltage of the floating capacitor (C ₁ ) is increased by the current of the inductor (L ₁ ) as shown in the following equation (9).

Here, T _ON is the time that the third switching device (M ₃ ) was turned on in the mode 9, ΔV: floating capacitor (C ₁ ) by the gas discharge current The decrease in voltage.

If the time that the third switching element (M ₃ ) is turned off during mode 7-2 is T _OFF , the floating capacitor (C ₁ ) The voltage is finally given by Equation 10 below.

의 조건을 만족하면 부유커패시터(C₁) 전압은 유지전압(V_S)으로 유지된다. 제2 다이오드(D₂)는 부유커패시터(C₁)의 전압이 유지전압(V_S)보다 커지는 경우에 도통되어서 부유커패시터(C₁) 전압을 유지전압(V_S)을 넘지 못하게 한다.therefore

When the condition is satisfied, the floating capacitor C ₁ voltage is maintained at the sustain voltage V _S. A second diode (D ₂₎ is able to exceed the floating capacitor be a voltage of (C ₁₎ to the conductive case is larger than the holding voltage (V _S) floating capacitor (C ₁₎ maintains the voltage voltage (V _S).

FIG. 18 is a circuit for charging the floating capacitor C ₁ by opening and closing the sixth switching element M ₆ on the main path.

19A to 19C are diagrams illustrating each mode equivalent circuit and a current path of FIG. 19 during charging according to an embodiment of the present invention, and FIG. 20 is a diagram illustrating an operation timing diagram when charging according to an embodiment of the present invention.

The charging method according to another embodiment of the present invention shown in FIGS. 18 to 20 may increase the maximum value of the charging current of the capacitor by additionally using the sixth switching element M ₆ . Duplicate descriptions are omitted since the driving timings are only different and can be easily understood by those skilled in the art from the foregoing description with reference to FIGS. 15 to 17.

FIG. 21 is a diagram illustrating a power recovery sustain driving circuit according to still another embodiment of the present invention, and FIG. 22 is a timing chart of FIG. 21. By using the floating capacitors C ₁ and 35, the sustain electrode of the panel capacitor C _P is fixed to the sustain voltage V _S instead of the ground voltage, and the 2 V _S voltage and the ground voltage are applied to the scan electrode Y. a holding voltage (2V _S) twice only sustain voltage (V _S) it can be applied to the scan electrode.

The circuit shown in Fig. 21 has almost the same operation as the components of the power recovery sustain driving circuit shown in Figs. 10A and 10B, and the voltage range that can be applied only to the scan electrode has a negative sustain voltage (-V _S ). The only difference is the shift from the positive polarity holding voltage (+ V _S ) to the ground voltage and twice the holding voltage (2V _S ).

As described above, the present invention provides the positive and negative sustain voltages to the scan electrodes using one positive polarity power supply in a state in which the sustain electrode is biased to the ground voltage or the sustain voltage to drive the plasma display panel. Board that supplies sustain voltage because it can supply double voltage of sustain voltage and ground voltage by applying double voltage of sustain voltage and ground voltage to scan electrode without separate voltage of negative voltage or double voltage. The integrated board can be realized by unifying printed circuit boards. In addition, the circuit structure is simple because the device is shared between a discharge holding part including a bootstrapping operation generating a negative holding voltage or a double holding voltage, and a panel charging / discharging part capable of recovering and administering energy stored in the panel. Low cost implementation is possible. In addition, since the inductor of the charge / discharge unit is used to generate the negative sustain voltage or the double sustain voltage, inrush current does not occur.

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 (23)

A plurality of first and second electrodes extending in parallel to each other, and a plurality of third electrodes extending to intersect with the plurality of first and second electrodes, wherein the discharge cells are defined in the crossing area In the driving device of the plasma display panel for driving the plasma display panel, The driving device of the plasma display panel includes a power recovery sustain driving circuit for recovering and reusing reactive power of the panel through the first electrode. The power recovery sustain drive circuit, A sustain discharge unit configured to output a first voltage or a second voltage to the panel by using a bootstrap operation of a reservoir in which a sustain voltage is stored; A panel charge / discharge unit configured to charge the voltage of the panel to the first voltage or to discharge the voltage to the second voltage; And And a floating capacitor charging unit which maintains the voltage of the reservoir, which is lowered by the gas discharge current, during the initial start-up or when the panel emits light at the sustain voltage. The method of claim 1, wherein the sustain discharge unit, Sustain voltage source; A first switching element electrically connected between the sustain voltage source and the panel; A second switching element having one end electrically connected to a contact point of the first switching element and the panel; A floating capacitor having one end electrically connected to the other end of the second switching element; Ground terminal; And a third switching device connected between the floating capacitor and the ground terminal. The first voltage is applied to the panel by the turn-on of the first switching element, and the bootstrap operation of the floating capacitor, in which the holding voltage is stored, is generated by the turn-on of the third switching element to generate the second voltage. And driving the second voltage to the panel by turning on a second switching element. The method of claim 2, wherein the panel charging and discharging unit, The third switching element connected in series between the ground terminal and the panel; A fourth switching element and an inductor; And the inductor and the panel are resonated by turning on the third and fourth switching elements to discharge the voltage of the panel to the second voltage or to charge the first voltage. The method of claim 3, wherein the floating capacitor charging unit, The first switching element; The inductor; The fourth switching element; The third switching element; And a first diode electrically connected between one end of the floating capacitor and a ground end thereof.  After the first, third, and fourth switching elements are turned on to accumulate magnetic energy in the inductor, the third switching element is turned off to supply the accumulated magnetic energy to the floating capacitor to supply the floating capacitor. A driving device of the plasma display panel for maintaining a voltage of the voltage as the sustain voltage. The method of claim 4, wherein the panel charging and discharging unit, A second diode electrically connected between the other end of the floating capacitor and the contact of the sustain voltage source and the first switching element; And a third diode electrically connected between the contact point of the inductor and the fourth switching element and the contact point of the floating capacitor and the second switching element. The second diode and the third diode drive the plasma display panel to set the path of the reflux current flowing through the inductor, in which the directions of the gas discharge current and the current from the panel are opposite after the charging or discharging ends. . The method of claim 5, The path of the reflux current during the charging passes through the third switching element, the fourth switching element, the inductor, and the first switching element, The gas discharge current path at the time of charging is the drive device of the plasma display panel which passes through the said 1st switching element and the said panel. The method of claim 5, The path of the reflux current during the discharge passes through the inductor, the internal diode of the fourth switching element, the floating capacitor, and the second switching element, And a path of the gas discharge current at the time of discharge is passed through the panel, the second switching element, the floating capacitor, and the third switching element. The method of claim 4, wherein the floating capacitor charging unit, After the first and fourth switching elements are turned on and the third switching element is turned off, the fourth switching element is turned on and the third and fourth switching elements are turned off to store the magnetic stored in the inductor. And supplying energy to the floating capacitor through the internal diode, the inductor, and the fourth switching element of the second switching element. A plurality of first and second electrodes extending in parallel to each other, and a plurality of third electrodes extending to intersect with the plurality of first and second electrodes, wherein the discharge cells are defined in the crossing area In the driving device of the plasma display panel for driving the plasma display panel, The driving apparatus of the plasma display panel includes a power recovery sustain driving circuit for recovering and reusing reactive power of the panel through the first electrode. The power recovery sustain drive circuit includes a sustain voltage source; A first switching element having one end connected to the sustain voltage source; A second switching element having one end connected to the other end of the first switching element; Ground terminal; A third switching element, a fourth switching element, and an inductor connected in series between the ground terminal and the contacts of the first switching element and the second switching element; A first diode connected between the ground terminal and the second switching element; And a floating capacitor connected between the contact point of the first diode and the second switching element and the contact point of the third switching element and the fourth switching element. The method of claim 9, The power recovery sustain driving circuit is configured to supply a first voltage to the panel by turning on the first switching element, and to boot the floating capacitor in which a holding voltage from the sustain voltage source is stored by turning on the third switching element. A second voltage is generated by a strap operation, and the second voltage is supplied to the panel by turning on the second switching element, and the inductor and the panel resonate by turning on the third switching element. The first voltage is charged to the panel or the second voltage is discharged. After the first, third and fourth switching devices are turned on to accumulate magnetic energy in the inductor, the third switching devices are turned off. Plasma display for supplying the accumulated magnetic energy to the floating capacitor to maintain the voltage of the floating capacitor at the sustain voltage Drive device for a panel. The method of claim 10, wherein the power recovery sustain drive circuit, A second diode connected between the contacts of the third and fourth switching elements and the contacts of the sustain voltage source and the first switching element; And a third diode connected between the contact point of the second switching element and the first diode and the contact point of the inductor and the fourth switching element. And the second diode and the third diode determine a path of the reflux current flowing in a direction opposite to the gas discharge current generated from the panel during the charging or discharging. The method of claim 10, wherein the power recovery sustain drive circuit, A fifth switching element connected between a contact point of the third switching element and a fourth switching element and a contact point of the sustain voltage source and the first switching element; And a third diode connected between the contact point of the second switching element and the first diode and the contact point of the inductor and the fourth switching element. And the internal diode and the third diode of the fifth switching element determine the path of the reflux current flowing in a direction opposite to the gas discharge current generated from the panel during the charging or discharging. The method of claim 12, The plasma display panel is driven by being divided into an initialization period for initializing a discharge cell, a writing period for selecting a cell that is turned on and a cell that is not turned on, and a sustain period for performing discharge in the cell that is turned on, The driving device of the plasma display panel, During the initialization period, further comprising an erase pulse applying unit applying an erase pulse, a rising pulse applying unit applying a rising pulse, and a falling pulse applying unit applying a falling pulse, during the writing period, a high scan voltage and a low scan voltage. And a scan pulse applying unit for applying a scan pulse having a scan pulse. The method of claim 13, wherein the rising pulse applying unit, A sixth switching element connected between a first node, which is a contact point of the first switching element and the second switching element, and a second node; A second capacitor connected between the first node and a rising voltage source; A seventh switching element connected between the second capacitor and the rising voltage source and the second node; And an eighth switching device connected between the second node and a third node. The first node, the seventh and eighth switching elements are turned on, and the sixth switching element is turned off, so that a rising pulse gradually rising by the rising voltage from the rising voltage source from the holding voltage from the holding voltage source is a third node. A driving device of the plasma display panel to output to. The method of claim 14, wherein the falling pulse applying unit, Falling lowest voltage source; And a ninth switching element connected between the third nodes. And the ninth switching element is turned on, and outputs a falling pulse to the third node, wherein the falling pulse gradually descends from the falling minimum voltage source to the falling minimum voltage. The method of claim 14, wherein the erase pulse applying unit, Erase voltage source; And a tenth switching element connected between the third nodes. And a tenth switching element is turned on to output an erase pulse to the third node, the erase pulse being gradually dropped to the erase voltage from the erase voltage source. The method of claim 14, wherein the scanning pulse applying unit, Low scan voltage source; An eleventh switching element connected between the row scan voltage source and the third node; High scan voltage source; A third capacitor connected between the third node and a high scan voltage source; And a scan switching unit connected between the contact point of the high scan voltage source and the third capacitor and the third node, the scan switching unit comprising a twelfth switching element and a thirteenth switching element. The eleventh and twelfth switching elements are turned on to output the high scan voltage from the high scan voltage source to the panel, and the thirteenth switching element is turned on to output the low scan voltage from the low scan voltage source to the panel. Driving device of plasma display panel. The method of claim 1, wherein the sustain discharge unit, Sustain voltage source; A first switching element electrically connected between the sustain voltage source and the panel; Ground terminal; A second switching element electrically connected between the panel and the ground terminal; A floating capacitor electrically connected between the ground terminal and the sustain voltage source; And a third switching element electrically connected between both ends of the floating capacitor. By turning on the third switching element, a bootstrap operation of the floating capacitor, in which the holding voltage from the sustain voltage source is stored, generates a first voltage, and the first voltage is applied to the panel by turning on the first switching element. And a second voltage, which is a ground voltage, is applied to the panel by turning on the second switching element. The method of claim 18, wherein the panel charging and discharging unit, The third switching element connected in series between the sustain voltage source and the panel; A fourth switching element and an inductor; The turn-on of the third switching element and the fourth switching element causes the inductor and the panel to resonate to discharge the voltage of the panel to the second voltage or to charge the plasma display panel. Device. The method of claim 19, wherein the floating capacitor charging unit, The second switching element; The inductor; The fourth switching element; The third switching element; And a first diode electrically connected between one end of the floating capacitor and the sustain voltage source. After the second to fourth switching elements are turned on to accumulate magnetic energy in the inductor, the third switching element is turned off to supply the accumulated magnetic energy to the floating capacitor to reduce the voltage of the floating capacitor. And a driving device of the plasma display panel held at the sustain voltage. The method of claim 2 or 10, A ground voltage is constantly applied to the second electrode. Wherein the first voltage is a positive sustain voltage, and the second voltage is a negative sustain voltage. The method of claim 18, A positive sustain voltage is constantly applied to the second electrode. And the first voltage is a voltage twice as large as the sustain voltage. The power recovery sustain driving circuit according to claim 9, A first step in which the first and fourth switching elements are turned on to maintain a voltage applied to the panel at a first voltage; A second step of turning on the first, third and fourth switching elements to accumulate magnetic energy in the inductor; A third step of turning on the third and fourth switching elements to recover energy stored in the panel by resonance of the inductor and the panel; The fourth step of turning on the second and third switching elements such that a reflux current in a direction opposite to the gas discharge current from the panel flows through the inductor; A fifth step of turning on the second to fourth switching elements to accumulate magnetic energy in the inductor; A sixth step of turning on the third and fourth switching elements to recover energy accumulated in the panel by resonance of the inductor and the panel; A seventh step in which the first, third and fourth switching elements are turned on so that a reflux current in a direction opposite to the gas discharge current from the panel flows through the inductor; And And driving the first and fourth switching devices so that the voltage applied to the panel is maintained at the first voltage.

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