KR100502906B1 - Driving method of plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a plasma display panel, and more particularly, to a power recovery circuit and a driving method thereof which directly contribute to plasma display light emission. Unlike the conventional simple LC resonance principle, the plasma display panel of the present invention uses the energy stored in the first and second inductors L1 and L2 to achieve zero voltage switching of the switches Ys, Yg, Xs, and Xg. It is possible to adjust the rise time and fall time in the voltage waveform across the panel capacitor (Cp).

Description

Driving method of plasma display panel {DRIVING METHOD OF PLASMA DISPLAY PANEL}

The present invention relates to a method of driving a plasma display panel (PDP).

A plasma display panel is a flat panel display device that displays characters or images by using 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, current flows in the discharge space while voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made. On the other hand, in the AC plasma display panel, since the electrode covers the dielectric layer, the current is limited by the formation of a natural capacitance component, and the electrode is protected from the impact of ions during discharge.

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

As shown in FIG. 1, the scan electrode 4 and the sustain electrode 5 covered with the dielectric layer 2 and the protective film 3 are arranged in parallel on the glass substrate 1. On the glass substrate 6, a plurality of address electrodes 8 covered with the insulator layer 7 are provided. The partition 9 is formed on the insulator layer 7 between the address electrodes 8 in parallel with the address electrode 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both side surfaces of the partition wall 9. The glass substrates 1 and 2 are disposed to face each other with the discharge space 11 therebetween so that the scan electrode 4, the address electrode 8, the sustain electrode 5, and the address electrode 8 are orthogonal to each other. The discharge space at the intersection of the address electrode 8 and the paired scan electrode 4 and the sustain electrode 5 forms a discharge cell 12.

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

As shown in FIG. 2, the electrodes of the plasma display panel have a matrix form of m × n. Specifically, the address electrodes A1 to Am are arranged in the column direction and the scan electrodes Y1 to the row direction. Yn) and sustain electrodes X1 to Xn are arranged in a zigzag. The discharge cell 12 shown in FIG. 2 corresponds to the discharge cell 12 shown in FIG.

In general, a method of driving an AC plasma display panel includes a reset period, an addressing period, a sustain period, and an erase period.

The reset period is a period of initializing the state of each cell in order to perform an addressing operation smoothly on the cell. The addressing period selects a cell to be turned on and a cell to be turned on by selecting a cell that is not turned on in the panel. 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 is performed on the addressed cell, and the erase period is a period in which the wall discharge of the cell is reduced to end the sustain discharge.

In the AC plasma display panel, since the scan electrodes and sustain electrodes for the sustain discharge act as capacitive loads, capacitances exist between the scan electrodes and the sustain electrodes, and in order to apply a waveform for the sustain discharge, Reactive power is needed. A circuit for recovering and reusing such reactive power is called a power recovery circuit.

Hereinafter, a power recovery circuit of a conventional AC plasma display panel and a driving method thereof will be described.

3 and 4 are diagrams showing a conventional power recovery circuit and its operation waveform.

As in Figure 3, L.F. The circuits proposed by Weber (US Pat. Nos. 4,866,349 and 5,081,400) are power recovery circuits of an AC plasma display panel, in which power recovery circuits 10 of sustain electrodes and power recovery circuits 11 (not shown) of scan electrodes are provided. Each one is made the same. The following describes a power recovery circuit for one electrode for convenience.

The conventional power recovery circuit 10 includes a power recovery unit including two switches Sa and Sb, diodes D1 and D2, an inductor Lc, and a power recovery capacitor Cc, and two switches connected in series. And a sustain discharge portion made of (Sc, Sd).

A plasma display panel is connected to a contact between two switches Sc and Sd of the sustain discharge portion, and the plasma display panel is equivalently represented as a capacitor Cp.

The conventional power recovery circuit configured as described above is operated in four modes according to the switching operation of the switches Sa to Sd, as shown in FIG. The waveforms of the current I _L flowing through the respective appear.

In the initial state, immediately before the switch Sa is turned on, the switch Sd is turned on so that the voltage Vp at both ends of the panel capacitor is maintained at 0V. At this time, the power recovery capacitor Cc is precharged with a voltage Vs / 2 equal to 1/2 of the sustain discharge voltage Vs so that an inrush current does not occur at the start of the sustain discharge.

In this state where the voltage Vp of both ends of the panel capacitor is maintained at 0 V, when the time t0 is reached, the operation of mode 1 in which the switch Sa is turned on and the switches Sb, Sc, and Sd are turned off starts.

In mode 1, an LC resonant circuit is formed in the path of the power recovery capacitor Cc, the switch Sa, the diode D1, the inductor Lc, and the panel capacitor Cp. Therefore, as shown in FIG. 4, the current I _L flowing through the inductor Lc is half-waved by LC resonance, and the voltage Vp at both ends of the panel capacitor is gradually increased to almost maintain discharge voltage Vs. Becomes At this time, almost no current flows through the inductor Lc at the time when the voltage Vp becomes the sustain discharge voltage Vs.

When mode 1 is completed, mode 2 is started in which switches Sa and Sc are turned on and switches Sb and Sd are turned off. In the mode 2, the externally applied voltage Vs flows directly through the switch Sc to the panel capacitor Cp so that the voltage Vp is maintained at Vs.

When mode 2 is completed while the voltage Vp across the panel capacitor is maintained, mode 3 is started in which the switch Sb is turned on and the switches Sa, Sc, and Sd are turned off.

In the mode 3, an LC resonant circuit is formed of the panel capacitor Cp, the inductor Lc, the diode D2, the switch S2, and the power recovery capacitor Cc, which are paths opposite to those of the mode 1, and FIG. As in, the current I _L flows through the inductor Lc and the voltage Vp decreases, so that the current I _L and the voltage Vp of the inductor Lc become zero at time t3.

In mode 4, the switches Sb and Sd are turned on, the switches Sa and Sc are turned off, and the voltage Vp is kept at zero. In this state, when the switch Sa is turned on again, the cycle is repeated in the operation of mode 1.

By the way, in the conventional power recovery circuit as described above, the switch constituting the circuit cannot be zero-voltage switched by the parasitic components of the actual circuit (parasitic resistance of the inductor, parasitic resistance of the capacitor and panel, conduction resistance of the switch), Accordingly, there is a problem that the switching loss is very large when the switch is turned on. That is, according to the conventional power recovery circuit, since the magnetic energy stored in the inductor Lc is zero when one terminal of the panel capacitor is increased by the sustain discharge voltage Vs, the panel is caused by the parasitic component of the actual circuit. If one terminal of the capacitor does not reach the sustain discharge voltage Vs, there is no voltage source to raise one terminal of the panel capacitor to the voltage Vs. Therefore, there is a problem in that the zero voltage switching of the actual switch Sc is impossible and the switching loss becomes very large when the switch is turned on.

In the conventional power recovery circuit, the power recovery capacitor Cc should always be charged by the voltage Vs / 2 immediately after the start of light emission, and at the start of sustain discharge in a state where the power recovery capacitor is not charged by Vs / 2. There is a problem in that a large inrush current occurs, and a protection circuit for limiting the inrush current must be provided separately.

In addition, in the conventional power recovery circuit, the rising or falling time of the voltage across the panel capacitor is long, so that the discharge of the panel may occur in the energy recovery section (the rising or falling section of the voltage), in which case the drop of the voltage across the panel capacitor occurs. Therefore, the sustain switch Sc is hard switched, which causes a problem in that the switching loss is very large when the switch is turned on.

An object of the present invention is to provide a method of driving a plasma display panel capable of zero voltage switching. Another object of the present invention is to provide a method of driving a plasma display panel that can remove an inrush current at the start of a sustain discharge operation. The present invention also provides a method of driving a plasma display panel having a short rise or fall period of the panel voltage.

In order to solve this problem, the present invention changes the X and Y electrode voltages of the panel using energy stored in the inductor after injecting current into the inductor in advance, and the rising time of one electrode voltage and falling time of the other electrode voltage do not overlap. Do not.

According to an aspect of the present invention, there is provided a method of driving a plasma display panel including a first electrode and a second electrode which are arranged in a zigzag pair with each other, and a panel capacitor is formed between the first electrode and the second electrode. . According to this method, first, while the voltages of the first and second electrodes are maintained at the first voltage, respectively, the first energy is injected into the first inductor connected to the first electrode to store the first energy. In the state where the voltage of the second electrode is maintained at the first voltage, the voltage of the first electrode is changed to the second voltage by using the resonance and the first energy between the first inductor and the panel capacitor. Energy remaining in the first inductor is recovered while the voltages of the first and second electrodes are maintained at the second and first voltages, respectively. The voltages of the first and second electrodes are continuously maintained at the second and first voltages. Next, in a state in which the voltages of the first and second electrodes are maintained at the second and first voltages, current is injected into the first inductor in a second direction opposite to the first direction to store the second energy. In the state where the voltage of the second electrode is maintained at the first voltage, the voltage of the first electrode is changed to the first voltage by using the resonance and the second energy between the first inductor and the panel capacitor. Energy remaining in the first inductor is recovered while the voltages of the first and second electrodes are maintained at the first voltage, respectively. The voltages of the first and second electrodes are continuously maintained at the first voltage, respectively.

According to this method, while the voltages of the first and second electrodes are respectively maintained at the first voltage, the third energy is injected into the second inductor electrically connected to the second electrode to inject the third energy. Save it. In the state where the voltage of the first electrode is maintained at the first voltage, the voltage of the second electrode is changed to the second voltage by using the resonance and the third energy between the second inductor and the panel capacitor. Energy remaining in the second inductor is recovered while the voltages of the first and second electrodes are maintained at the first and second voltages, respectively. The voltages of the first and second electrodes are continuously maintained at the first and second voltages, respectively. Next, while maintaining the voltages of the first and second electrodes at the first and second voltages, the fourth energy is stored by injecting a current in a fourth direction opposite to the third direction to the second inductor. In the state where the voltage of the first electrode is maintained at the first voltage, the voltage of the second electrode is changed to the first voltage by using the resonance and the fourth energy between the second inductor and the panel capacitor. Energy remaining in the second inductor is recovered while the voltages of the first and second electrodes are maintained at the first voltage, respectively. The voltages of the first and second electrodes are continuously maintained at the first voltage, respectively.

According to another feature of the invention, the first and second electrodes are connected in series between the first and second power supplies for supplying the first and second voltages, respectively, and the contacts are connected to the first electrode. A second switch, third and fourth switches connected in series between the first and second power sources, the contacts of which are connected to the second electrode, and a first inductor, of which the first end is connected to the first electrode; A method of driving a plasma display panel in which a panel capacitor is formed between a first electrode and a second electrode is provided.

According to this method, first, the first stage of the first inductor is charged with the third voltage while the second terminal of the first inductor is turned on to maintain the voltages of the first and second electrodes at the first voltage, respectively. The first energy is stored in the first inductor by supplying a current in a first direction to the capacitor. The first switch is turned off while the voltage of the second electrode is maintained at the first voltage to change the voltage of the first electrode to the second voltage by using the resonance and the first energy between the first inductor and the panel capacitor. . The second switch is turned on while the voltage of the second electrode is maintained at the first voltage to maintain the voltage of the first electrode at the second voltage, and the energy remaining in the first inductor is recovered. Next, the first inductor is connected to the first capacitor while the voltages of the first and second electrodes are maintained at the second and first voltages, respectively, so that the first inductor has a current in a second direction opposite to the first direction. To store the second energy. The second switch is turned off while the voltage of the second electrode is maintained at the first voltage to change the voltage of the first electrode to the first voltage by using the resonance and the second energy between the first inductor and the panel capacitor. . The first switch is turned on while the voltage of the second electrode is maintained at the first voltage, thereby maintaining the voltage of the first electrode at the first voltage, and recovering energy remaining in the first inductor.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

A method of driving a plasma display panel according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

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

As shown in FIG. 5, a plasma display panel according to an exemplary embodiment of the present invention includes a plasma panel 100, an address driver 200, a scan / hold driver 300, and a controller 400.

The plasma panel 100 includes a plurality of address electrodes A1 to Am arranged in a column direction, a plurality of scan electrodes (hereinafter referred to as Y electrodes) Y1 to Yn arranged in a zigzag direction in a row direction, and a sustain electrode ( (Hereinafter referred to as X electrode) (X1 to Xn). The address driver 200 receives an address drive control signal from the controller 400 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode A1 to Am. The scan / hold driver 300 receives a sustain discharge control signal from the controller 400 and alternately inputs a sustain discharge pulse to the Y electrodes Y1 to Yn and the X electrodes X1 to Xn to sustain discharge for the selected discharge cell. Do this. The control unit 400 receives an image signal from the outside, generates an address driving control signal and a sustain discharge control signal, and applies them to the address driver 200 and the scan / sustain driver 300, respectively.

The scan / maintenance driver 300 according to an exemplary embodiment of the present invention includes a power recovery circuit which is a circuit for recovering and reusing reactive power. The power recovery circuit 320 according to the exemplary embodiment of the present invention is illustrated in FIG. 6. .

As shown in FIG. 6, the power recovery circuit 320 according to the embodiment of the present invention includes a sustain discharge unit 322, a Y electrode charge / discharge unit 324, and an X electrode charge / discharge unit 326.

The sustain discharge unit 322 is connected to the sustain discharge voltage Vs or the ground voltage and includes four switches Ys, Yg, Xs, and Xg, and the switches Ys, Yg, Xs, and Xg each have a body diode. It is made of MOSFET. The voltages Vy and Vx of both terminals of the panel capacitor Cp maintain the sustain discharge voltage Vs or the ground voltage by the switching operation of these four switches.

The Y electrode charge / discharge unit 324 increases or decreases the voltage Vp at both ends of the power recovery capacitors Cyer1 and Cyer2 and the panel capacitor Cp connected in series between the sustain discharge voltage Vs and the ground voltage. To the energy recovery switches Yr and Yf connected in parallel with the contacts between the capacitors Cyer1 and Cyer2, and the inductor L1 formed between the contacts between the switches Yr and Yf and the panel capacitor Cp. do. In addition, the Y electrode charging and discharging unit 324 according to the embodiment of the present invention is connected to the switches (Yr, Yf), respectively, and sets the current path supplied to the panel capacitor Cp and the current path recovered from the panel capacitor ( Dy1, Dy2) may be further included. The Y electrode charge and discharge unit 324 serves to charge the Y electrode of the panel capacitor to the sustain discharge voltage (Vs) or to discharge the ground voltage.

The X electrode charge / discharge unit 326 increases or decreases the voltage Vp at both ends of the power recovery capacitors Cxer1 and Cxer2 and the panel capacitor Cp connected in series between the sustain discharge voltage Vs and the ground voltage. Energy recovery switches Xr and Xf connected in parallel with the contacts between the capacitors Cxer1 and Cxer2, and an inductor L2 formed between the contacts between the switches Xr and Xf and the panel capacitor Cp. do. In addition, the X electrode charging and discharging unit 326 is connected to the switches Xr and Xf, respectively, and sets the current path supplied to the panel capacitor Cp and the current path recovered from the panel capacitor Cp. It may further include. The X electrode charge / discharge unit 326 serves to charge the X electrode terminal of the panel capacitor to the sustain discharge voltage Vs or to discharge the ground voltage.

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. 7A to 7H and 8.

7A to 7H are diagrams showing current paths of respective modes of the power recovery circuit according to the embodiment of the present invention, and FIG. 8 is a diagram showing an operation timing diagram of the power recovery circuit according to the embodiment of the present invention.

In the embodiment of the present invention, before the mode 1 starts, the switches Yg and Xg are turned on, and the capacitors Cyer1, Cyer2, Cxer1, and Cxer2 are charged with voltages of V1, V2, V3, and V4, respectively. Assume that the inductance of (L1, L2) is L.

① Mode 1 (M1)-see FIG. 7A

In the mode 1 section, the switch Yr is turned on while the switches Yg and Xg are turned on. When the switch Yr of the Y electrode charge / discharge unit 324 is turned on while the switches Yg and Xg are turned on, as shown in FIG. 7A, the capacitor Cyer2, the switch Yr, the inductor L1, and the switch are turned on. The current path is formed at (Yg).

Accordingly, as shown in FIG. 8, the current I _L1 flowing in the inductor L1 increases linearly with a slope of V2 / L in the mode 1 period, and magnetic energy is accumulated in the inductor L1. do.

② Mode 2 (M2)-see FIG. 7B

In the mode 2 section, the switch Yg is turned off while the switches Yr and Xg are turned on. Then, as shown in FIG. 7B, a current path is formed by the capacitor Cyer2, the switch Yr, the inductor L1, the panel capacitor Cp, and the switch Xg. At this time, as shown in FIG. 8, a resonance current flows through the inductor L1 due to the panel capacitance, and the Y electrode voltage Vy rises from the ground voltage to the sustain discharge voltage Vs.

③ Mode 3 (M3)-see FIG. 7C

In mode 3, the switch Ys is turned on while the switches Yr and Xg are turned on.

When the Y electrode voltage Vy becomes Vs, the sustain discharge voltage at time t2, the body diode of the switch Ys becomes conductive. At this time, as shown in FIG. 8, when the switch Ys is turned on, the voltage between the drain and the source of the switch Ys becomes conductive, so that the switch Ys performs zero voltage switching. No turn-on switching losses of Ys) occur. According to the embodiment of the present invention, since the energy is stored in the inductor L1 even when the voltage Vp of the Y electrode of the panel capacitor reaches the sustain discharge voltage Vs, the parasitic component of the circuit Even in the actual case, the Y electrode voltage Vy of the panel capacitor may increase to the sustain discharge voltage Vs. Therefore, even when the switch Ys has a parasitic component of the circuit, zero voltage switching can be performed.

In mode 3, as shown in FIG. 8, while the Y electrode voltage Vy is maintained at the voltage Vs, the current I _L1 of the inductor _L1 is the capacitor Cyer1, the switch Yr, and the inductor L1. In the path of the body diode of the switch Ys and the power source Vs, the slope of -V1 / L decreases linearly to zero. That is, energy stored in the inductor L1 is recovered to the capacitor Cyer1 through the body diode of the switch Ys.

④ Mode 4 (M4)-see FIG. 7D

In the mode 4 section, the switch Yr is turned off while the switches Ys and Xg are turned on, and the Y and X electrode voltages Vy and Vx are maintained at the sustain discharge voltage Vs and the ground voltage, respectively. Therefore, the voltage Vp at both ends of the panel capacitor is maintained at the sustain discharge voltage Vs so that the panel emits light.

⑤ Mode 5 (M5)-see FIG. 7E

In the mode 5 section, the switch Yf is turned on while the switches Ys and Xg are turned on. When the switch Yf of the Y electrode charging / discharging unit 324 is turned on while the switches Ys and Xg are turned on, the current path is performed to the switch Ys, the inductor L1, the switch Yf, and the capacitor Cyer2. Is formed.

Therefore, as shown in FIG. 8, the current IL1 flowing in the inductor L1 decreases linearly with a slope of −V1 / L in the mode 5 section, and magnetic energy is accumulated in the inductor L1.

⑥ Mode 6 (M6)-see FIG. 7F

In the mode 6 section, the switch Ys is turned off while the switches Yf and Xg are turned on. Then, as shown in Fig. 7F, a current path is formed by the switch Xg, the inductor L1, the switch Yf, and the capacitor Cyer2. At this time, as shown in FIG. 8, a resonance current due to panel capacitance flows through the inductor L1, and the Y electrode voltage Vy drops from the sustain discharge voltage Vs to the ground voltage. Since the X electrode voltage Vx maintains the ground voltage, the voltage Vp at both ends of the panel capacitor falls from the sustain discharge voltage Vs to the ground voltage.

⑦ Mode 7 (M7)-see FIG. 7G

In mode 7, while the switches Yf and Xg are turned on, the switch Yg is turned on.

When the Y electrode voltage Vy becomes the ground voltage at time t6, the body diode of the switch Yg becomes conductive. At this time, when the switch Yg is turned on as shown in FIG. 8, since the switch Yg performs zero voltage switching, the turn-on switching loss of the switch Yg does not occur.

In mode 7, as shown in FIG. 8, while the Y electrode voltage Vy and the X electrode voltage Vx maintain the ground voltage, the current IL1 flowing in the inductor L1 of the Y electrode charge / discharge unit 324 is It has a slope of V2 / L through the path of the body diode of the switch Yg, the inductor L1, the switch Yf, and the capacitor Cyer2, and increases linearly to zero. In other words, the energy stored in the inductor L1 is recovered to the capacitor Cyer2 through the switch Yf.

⑧ Mode 8 (M8)-see FIG. 7H

In the mode 8 section, the switch Yf is turned off while the switches Yg and Xg are turned on to maintain the Y electrode voltage Vy at the ground voltage. In this section, the voltage Vp at both ends of the panel capacitor Cp becomes 0V, and the panel does not emit light.

As shown in Fig. 8, the switches Xr, Xs, Xf, and Xg in the modes 9 to 16 (M9 to M16) and the switches Yr, Ys, Yf, and Yg after the mode 8 (M8) are respectively Mode 1 It operates in the same manner as the switches Yr, Ys, Yf and Yg and the switches Xr, Xs, Xf and Xg in the operations 8 to 8 (M1 to M8). Therefore, the X electrode voltage Vx of the panel capacitor Cp in the modes 9 to 16 (M9 to M16) has the same waveform as the Y electrode voltage Vy in the modes 1 to 8 (M1 to M8). Therefore, the voltage Vp at both ends of the panel capacitor Cp in the modes 9 to 16 (M9 to M16) swings between the negative sustain discharge voltage (-Vs) at the ground voltage. The description of the operation in the modes 9 to 16 (M9 to M16) of the power recovery circuit according to the embodiment of the present invention will be omitted since those skilled in the art can easily understand through the description of the modes 1 to 8 (M1 to M8).

According to the embodiment of the present invention described above, boosting the inductor current for energy recovery in modes 1 and 5, and boosted when the Y electrode voltage Vy is raised and lowered in modes 2 and 6 By using current (energy) it is possible to raise both terminals of the panel capacitor to the sustain discharge voltage (Vs) or to ground voltage regardless of the power recovery rate. Therefore, according to the embodiment of the present invention, zero voltage switching of the switch may be achieved by using a boosted current in the inductor.

On the other hand, the power recovery circuit according to the embodiment of the present invention shown in Figure 6 by adjusting the overlapping interval of the gate signal of the switch (Yr, Yg) and the switch (Ys, Yf) voltage of the energy recovery capacitor (Cyer1, Cyer2) Level adjustment is possible.

That is, if the time OLT1 at which the gate-on signals of the switches Yr and Yg shown in FIG. 8 overlap and the time OLT2 at which the gate-on signals of the switches Ys and Yf overlap, are the same, FIG. As described above, the charge / discharge current of the capacitor Cyer2 is the same, so that the voltages V1 and V2 of each of the capacitors Cyer1 and Cyer2 are maintained at Vs / 2. Thus, V1 = V2 = Vs / 2.

On the other hand, when the time OLT1 is made longer than the time OLT2, as shown in FIG. 10, the discharge current of the capacitor Cyer2 becomes larger than the charging current of the capacitor Cyer2, and thus the voltage V1 at both ends of the capacitor Cyer1. ) Becomes larger than the voltage V2 across the capacitor Cyer2. Therefore, the voltage V1 becomes larger than Vs / 2.

On the contrary, when the time OLT1 is made shorter than the time OLT2, as shown in FIG. 11, the discharge current of the capacitor Cyer2 becomes smaller than the charging current of the capacitor Cyer2, and thus the voltage V1 at both ends of the capacitor Cyer1. ) Becomes smaller than the voltage V2 across the capacitor Cyer2.

Of course, the power recovery circuit according to the embodiment of the present invention shown in FIG. 6 has the same principle as adjusting the voltage levels of the energy recovery capacitors Cyer1 and Cyer2 as described above, and the switches Xr and Xg and the switches Xs and Xf. It is possible to adjust the voltage level of the energy recovery capacitors Cxer1 and Cxer2 by adjusting the section in which the gate signals overlap with each other.

Thus, unlike the conventional circuit shown in FIG. 3, the power recovery circuit shown in FIG. 6 exists only as a voltage source for boosting current by the voltage of the energy recovery capacitor, and keeps the voltage value at Vs / 2. The advantage is that there is no need.

Meanwhile, according to the exemplary embodiment of the present invention, the rising time T _Rising and the falling time T _Falling of the Y electrode voltage Vy in the modes 2 and 6 may be obtained as follows.

First, the circuit state in mode 2 is modeled as shown in FIG. 12 to obtain rise and fall times (T _{Rising and} T _Falling ).

Where Ipk is equal to Equation 1 below.

Here, ΔT is a rise and fall time (T _Rising, T _Falling ).

Based on the equivalent circuit of FIG. 12, the rise time T _Rising of the Y electrode voltage Vy is obtained as shown in Equation 2 below.

here, to be.

The falling time T _Falling of the Y electrode voltage Vy may be replaced with V1 in the formula (2).

As can be seen from Equation 2, according to the embodiment of the present invention, the rise and fall times can be known by setting values of the inductor and the power recovery capacitor. Therefore, according to the embodiment of the present invention, by appropriately selecting the inductance and the power recovery capacitance, the rise and fall time of the panel voltage can be shortened so that the panel can discharge in the sustain discharge section except the rise and fall of the panel voltage. Can be.

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

As described above, the present invention enables zero voltage switching in spite of parasitic components of the circuit, and prevents inrush current at the start of the sustain discharge operation. In addition, the present invention can shorten the rise and fall time of the panel voltage without increasing the current flowing through the drive element so that the panel can perform the discharge in the sustain discharge period except the rise and fall period of the panel voltage. Since the input voltage is divided and charged to the energy recovery capacitor when the circuit operation is started, a voltage with the internal voltage of the energy recovery switch divided is applied at the initial startup, so that a switch with a low voltage can be used to reduce costs and increase efficiency. have.

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

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

3 and 4 are diagrams showing a conventional power recovery circuit and its driving waveform, respectively.

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

6 is a view showing a power recovery circuit according to an embodiment of the present invention.

7A to 7H are diagrams showing an operation mode of the power recovery circuit shown in FIG. 6, respectively.

8 is a diagram illustrating an operation timing according to an embodiment of the present invention.

9 to 11 are views showing charge and discharge current of the inductor according to the embodiment of the present invention.

12 is a diagram showing an equivalent circuit of Mode 2 according to the embodiment of the present invention.

Claims (11)

A method of driving a plasma display panel including a first electrode and a second electrode arranged in pairs in a zigzag manner, wherein a panel capacitor is formed between the first electrode and the second electrode. A first step of storing first energy by injecting a current in a first direction into a first inductor electrically connected to the first electrode while the voltages of the first and second electrodes are respectively maintained at a first voltage; Changing the voltage of the first electrode to a second voltage using resonance and the first energy between the first inductor and the panel capacitor while the voltage of the second electrode is maintained at the first voltage. 2 step, A third step of recovering energy remaining in the first inductor while maintaining voltages of the first and second electrodes at the second and first voltages, respectively; A fourth step of maintaining the voltages of the first and second electrodes at the second and first voltages, The second energy is stored by injecting a current in a second direction opposite to the first direction to the first inductor while maintaining the voltages of the first and second electrodes at the second and first voltages, respectively. The fifth step, The voltage of the first electrode is changed to the first voltage using the resonance and the second energy between the first inductor and the panel capacitor while the voltage of the second electrode is maintained at the first voltage. Sixth step, A seventh step of recovering energy remaining in the first inductor while maintaining voltages of the first and second electrodes at the first voltage, and An eighth step of maintaining the voltages of the first and second electrodes at the first voltage, respectively Method of driving a plasma display panel comprising a. In claim 1, While the voltages of the first and second electrodes are respectively maintained at the first voltage, a ninth energy is stored by injecting current in a third direction into a second inductor electrically connected to the second electrode. step, The voltage of the second electrode is changed to the second voltage using the resonance and the third energy between the second inductor and the panel capacitor while the voltage of the first electrode is maintained at the first voltage. 10th Step, An eleventh step of recovering energy remaining in the second inductor while maintaining the voltages of the first and second electrodes at the first and second voltages, respectively; A twelfth step of maintaining the voltages of the first and second electrodes at the first and second voltages, respectively, The fourth energy is stored by injecting a current in a fourth direction opposite to the third direction to the second inductor while maintaining the voltages of the first and second electrodes at the first and second voltages, respectively. The thirteenth step, The voltage of the second electrode is changed to the first voltage using the resonance and the fourth energy between the second inductor and the panel capacitor while the voltage of the first electrode is maintained at the first voltage. Fourteenth Step, A fifteenth step of recovering energy remaining in the second inductor while maintaining the voltages of the first and second electrodes at the first voltage; and A sixteenth step of maintaining voltages of the first and second electrodes at the first voltage; The driving method of the plasma display panel further comprising. In claim 1, The plasma display panel includes a sustain discharge unit including first and second switches connected in series between first and second power supplies for supplying the first and second voltages, respectively, and having a contact point connected to the first electrode. Include, And the sustain discharge unit performs zero voltage switching of the first and second switches using energy present in the first inductor. First and second switches connected in series between first and second electrodes, first and second power supplies for supplying first and second voltages, respectively, and contact points of which are connected to the first electrodes, the first and second switches A third and fourth switch connected in series between a second power source and a contact thereof connected to the second electrode, and a first inductor connected to the first electrode at a first end thereof; In the method of driving a plasma display panel in which a panel capacitor is formed between the second electrode, With the first and third switches turned on to maintain the voltages of the first and second electrodes at the first voltage, respectively, the second terminal of the first inductor is charged to the first capacitor charged with the third voltage. A first step of supplying a current in a first direction to the first inductor to store first energy; The first switch is turned off while the voltage of the second electrode is maintained at the first voltage, so that the voltage between the first electrode using the resonance and the first energy between the first inductor and the panel capacitor. A second step of changing to the second voltage, The second switch is turned on while the voltage of the second electrode is maintained at the first voltage to maintain the voltage of the first electrode at the second voltage, and to recover energy remaining in the first inductor. 3 steps, Connecting the first inductor to the first capacitor while the voltages of the first and second electrodes are maintained at the second and first voltages, respectively, so that the first inductor is opposite to the first direction; A fourth step of storing second energy by supplying current in two directions, The second switch is turned off while the voltage of the second electrode is maintained at the first voltage, so that the voltage between the first electrode using the resonance and the second energy between the first inductor and the panel capacitor. A fifth step of changing to the first voltage, and The first switch is turned on while the voltage of the second electrode is maintained at the first voltage to maintain the voltage of the first electrode at the first voltage, and to recover energy remaining in the first inductor. 6 steps Method of driving a plasma display panel comprising a. In claim 4, In the third step, after all the energy remaining in the first inductor is recovered, the connection between the first inductor and the first capacitor is cut off and the voltages of the first and second electrodes are respectively reduced. Further comprising maintaining at 1 voltage, In the sixth step, after all the energy remaining in the first inductor is recovered, the connection between the first inductor and the first capacitor is cut off, and the voltages of the first and second electrodes are set to the first voltage, respectively. Further comprising the step of maintaining Driving method of plasma display panel. delete delete delete In claim 4, The first step is to turn on a fifth switch connected between the second terminal of the first inductor and the first capacitor to connect the first inductor and the first capacitor, The fourth step is to turn on a sixth switch connected between the second end of the first inductor and the first capacitor to connect the first inductor and the first capacitor. Driving method of plasma display panel. In claim 4, The plasma display panel further includes a second inductor connected to a first end connected to the second electrode, With the first and third switches turned on to maintain the voltages of the first and second electrodes at the first voltage, respectively, the second terminal of the second inductor is charged to the second capacitor charged with the fourth voltage. A seventh step of supplying a current in a third direction to the second inductor to store third energy; The third switch is turned off while the voltage of the first electrode is maintained at the first voltage, so that the voltage between the second electrode using the resonance and the third energy between the second inductor and the panel capacitor. An eighth step of changing a to the second voltage, Turning on the fourth switch to maintain the voltage of the second electrode at the second voltage while recovering energy remaining in the second inductor while the voltage of the first electrode is maintained at the first voltage; 9 steps, Connecting the second inductor to the second capacitor while the voltages of the first and second electrodes are maintained at the first and second voltages, respectively; A tenth step of storing fourth energy by supplying current in four directions; The fourth switch is turned off while the voltage of the first electrode is maintained at the first voltage, so that the voltage between the second electrode using the resonance and the fourth energy between the second inductor and the panel capacitor. An eleventh step of changing to the first voltage, and Turning on the third switch to maintain the voltage of the second electrode at the first voltage and recovering energy remaining in the second inductor while the voltage of the first electrode is maintained at the first voltage. 12 steps The driving method of the plasma display panel further comprising. In claim 10, In the ninth step, after all the energy remaining in the second inductor is recovered, the connection between the second inductor and the second capacitor is cut off and the voltages of the first and second electrodes are respectively reduced. Further comprising maintaining at 2 voltages, In the twelfth step, after all the energy remaining in the second inductor is recovered, the connection between the second inductor and the second capacitor is cut off and the voltages of the first and second electrodes are set to the first voltage, respectively. Further comprising the step of maintaining Driving method of plasma display panel.