KR20060022596A - Driving device for plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel driving apparatus which maintains a constant voltage of energy stored in the energy storage unit at Vs / 2 even when the inductance of the energy recovery path and the inductance of the energy supply path are different from each other. It works.

The present invention relates to a plasma display panel driving apparatus including an energy recovery circuit for sustain discharge when driving a plasma display panel, wherein the energy stored in the energy storage unit is supplied to the panel through resonance through a supply path having a predetermined inductance. And an inductor unit for recovering energy supplied to the panel to the energy storage unit through resonance of a recovery path having an inductance larger than the supply path, and an energy supply for switching to supply energy to the panel through the inductor unit. A control unit, a sustain voltage supply control unit for maintaining the sustain voltage at the panel at the sustain voltage Vs, an energy recovery control unit for switching the energy supplied to the panel through the inductor unit, and an external base From a voltage source A base voltage supply control unit for supplying a base voltage to the panel at an urgent voltage, and a voltage holding unit for maintaining a constant voltage of energy stored in the energy storage unit at the sustain voltage Vs. .

Plasma Display Panels, Drivers, Inductors. Inductance, sustain voltage, capacitor,

Description

Plasma Display Panel Driver {Driving Device for Plasma Display Panel}

1 is a view showing the structure of a plasma display panel of the present invention.

2 is a diagram illustrating a method of expressing image gradation of a conventional plasma display panel.

3 is a diagram showing a configuration of a conventional plasma display panel driving apparatus.

4 is a view illustrating a driving waveform of a driving device in the Y electrode driver shown in FIG. 1;

FIG. 5 is a diagram illustrating a structure of a driving apparatus considering the influence of an inductor of an energy recovery circuit in a conventional plasma display panel.

FIG. 6 is a view illustrating another structure of a driving device considering the influence of an inductor of an energy recovery circuit in a conventional plasma display panel.

7 is a view for explaining the imbalance between the energy supply operation and the energy recovery operation in the conventional plasma display panel drive device.

8 is a view showing an embodiment of a plasma display panel driving apparatus according to the present invention.

9 is a view illustrating a driving waveform of a driving device in the Y electrode driver shown in FIG. 8;

10 is a view showing another embodiment of a plasma display panel driving apparatus according to the present invention.

11 is a view for explaining the output voltage of the energy storage unit in the plasma display panel driving apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

80: energy storage unit 81: energy supply control unit

82: inductor 83: sustain voltage supply control unit

84: energy recovery control unit 85: base voltage supply control unit

86: voltage holding unit Cp: panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel driving apparatus for improving the structure of an energy recovery circuit to stabilize driving.

In general, a plasma display panel is a partition wall formed between an upper substrate and a lower substrate to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel. As shown, the plasma display panel is coupled in parallel with the upper substrate 100, which is the display surface on which the image is displayed, and the lower substrate 110 forming the rear surface with a predetermined distance therebetween.

The upper substrate 100 is made of a scan electrode 101 (hereinafter referred to as Y electrode) and a sustain electrode 102 (hereinafter referred to as Z electrode), that is, a transparent ITO material for mutual discharge in one discharge cell and maintaining light emission of the cell. The Y electrode 101 and the Z electrode 102 provided with the formed transparent electrode a and the bus electrode b made of a metal material are formed in pairs. The Y electrode 101 and the Z electrode 102 are covered by one or more dielectric layers 103 which limit the discharge current and insulate the electrode pairs, and the magnesium oxide top surface of the dielectric layer 103 to facilitate discharge conditions. A protective layer 104 on which (MgO) is deposited is formed.

The lower substrate 110 is arranged such that a plurality of discharge spaces, that is, barrier ribs 111 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 112 (hereinafter referred to as X electrodes) for performing address discharge to generate vacuum ultraviolet rays are disposed in parallel with the partition wall 111. On the upper side of the lower substrate 110, R, G, and B phosphors 113 which emit visible light for image display during address discharge are coated. A white dielectric 114 is formed between the X electrode 112 and the phosphor 113 to protect the X electrode 112 and reflect visible light emitted from the phosphor 113 to the upper substrate 100.

A method of expressing image gradation of a conventional plasma display panel having such a structure will be described with reference to FIG. 2.

2 is a diagram illustrating a method of expressing image gray scale of a conventional plasma display panel. As shown, the image gradation of the plasma display panel is driven by dividing one frame into several subfields having different emission counts. Each subfield is divided into a reset section for uniformly generating a discharge, an address section for selecting a discharge cell, and a sustain section for implementing gray levels according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame section (16.67 ms) corresponding to 1/60 second is divided into eight subfields. In addition, each of the eight subfields is divided into an address period and a sustain period. Here, the reset section and the address section of each subfield are the same for each subfield, while the sustain section increases at a rate of 2n (n = 0,1,2,3,4,5,6,7) in each subfield. do.

On the other hand, the driving device for driving the plasma display panel includes a driving device for applying the alternating sustain voltage Vs to the Y electrode and the Z electrode in order to maintain the discharge of the selected cell in the sustain period.

The driving apparatus of the plasma display panel is included in the Y electrode driving unit and the Z electrode driving unit, respectively. The driving apparatus of the plasma display panel included in each driving unit will be described with reference to FIG. 3.

3 is a view showing the configuration of a driving apparatus of a conventional plasma display panel. As shown in the drawing, the driving apparatus of the conventional plasma display panel uses an energy recovery circuit to recover unnecessary power generated in the panel, that is, reactive power. The driving method of the driving apparatus of the conventional plasma display panel will be described with reference to FIG. 4 as follows.

First, in a first state (state 1), the first switch Q1 is turned on and the second to fourth switches Q2, Q3, and Q4 are turned off. As a result, Vp increases as energy stored in the capacitor Css is supplied to the panel Cp. In the first state, as shown in FIG. 3, the current flowing through the inductor L becomes + IL since energy is supplied from the capacitor Css to the panel Cp.

In the second state (state 2), the first switch Q1 and the second switch Q2 are turned on, and the third switch Q3 and the fourth switch Q4 are turned off. Accordingly, Vp becomes the sustain voltage Vs. The sustain voltage Vs is applied to the panel Cp at the end of the first state 1, that is, at the time t1 becomes the maximum value Vs due to LC resonance. Here, the sustain voltage Vs means a voltage for maintaining the discharge of the discharge cell.

Thereafter, in the third state (state 3), the third switch Q3 is turned on, and the first switch, the second switch, and the fourth switches Q1, Q2, and Q4 are turned off. As a result, energy stored in the panel Cp is discharged to the capacitor Css, and energy is recovered, and Vp drops. In the third state, since current flows from the panel Cp to the capacitor Css, the current flowing through the inductor L becomes -IL.

Finally, in the fourth state 4, the third switch Q3 and the fourth switch Q4 are turned on, and the first switch and the second switches Q1 and Q2 are turned off. Vp thus becomes the ground level. At the end of the third state (state 3), that is, at t2, Vp is maintained at the ground level.

The energy recovery circuit included in the driving device of the conventional plasma display panel operated as described above uses only one inductor L for energy recovery and supply, as described above. Drive efficiency is different depending on.

In other words, if the inductance of the inductor is large, the power consumption is reduced, and thus the driving efficiency of the energy recovery circuit is high. On the other hand, the sustain pulse voltage rises slowly, so that a strong discharge is difficult to occur. .

In order to solve this problem, the energy stored in the capacitor Css is stored in the capacitor Css through a first inductor having a relatively small inductance in the period ER-up in which the energy stored in the capacitor Css is supplied to the panel Cp. In the period ER-down, the energy C is supplied to the panel Cp, and the energy stored in the panel Cp is recovered to the capacitor Css. The panel Cp is provided through a second inductor having a relatively large inductance. The structure of the energy recovery circuit included in the driving device of the plasma display panel is improved so that the energy stored in the C) is recovered by the capacitor Css. The driving apparatus of the conventional plasma display panel is shown in FIG. 5.

FIG. 5 is a view illustrating a structure of a driving apparatus considering the influence of an inductor of an energy recovery circuit in a conventional plasma display panel. As shown in the drawing, in consideration of the influence of the inductor of the energy recovery circuit in the conventional plasma display panel, the first switch Q1, the first diode D1, and the first inductor L1 are sequentially turned on in the first state of FIG. 4. The supply path passes through the capacitor Css to supply energy to the panel Cp, and in the third state, the recovery path passes through the second inductor L2, the second diode D2, and the third switch Q3. The energy is recovered from the panel Cp to the capacitor Css. Here, the inductance of the first inductor L1 is smaller than the inductance of the second inductor L2.

The energy recovery circuit included in the driving apparatus of the conventional plasma display panel having such a structure reduces power consumption because the energy of the panel Cp is recovered to the capacitor Css through the second inductor L2 having a relatively large inductance. In addition, since the energy of the capacitor Css is supplied to the panel Cp through the first inductor L1 having a relatively small inductance, the voltage rises quickly to generate a relatively stronger discharge, thereby improving discharge efficiency.

FIG. 6 is a view illustrating another structure of a driving device considering the influence of an inductor of an energy recovery circuit in a conventional plasma display panel. As shown in FIG. 4, another structure considering the influence of the inductor of the energy recovery circuit in the conventional plasma display panel includes the first switch Q1, the first diode D1, and the first inductor L1 ′ in the first state of FIG. 4. In order to supply energy from the capacitor (Css) to the panel (Cp) in order through the supply path, and in the third state, the first inductor (L1 '), the second inductor (L2'), the second diode (D2), The recovery path through the third switch Q3 in turn allows energy to be recovered from the panel Cp to the capacitor Css. In this case, since the energy of the panel Cp is recovered to the capacitor Css through both the first inductor L1 'and the second inductor L2', that is, a large inductance is generated in the energy recovery path. This decreases and because the energy of the capacitor Css is supplied to the panel Cp only through the first inductor L1 ′, i.e., a relatively small inductance is generated in the energy supply path, thereby accelerating the voltage rise and making it relatively stronger. By generating a discharge, the discharge efficiency is improved.

However, in the structure of increasing the discharge efficiency by placing an inductance larger than the energy supply path in the energy recovery path, the switching time of energy supply and energy recovery is different, and the energy induction of each energy supply path and energy recovery path is different. An imbalance between the supply operation and the energy recovery operation is generated. Looking at the imbalance between the energy supply operation and the energy recovery operation as shown in FIG.

7 is a view for explaining the imbalance between the energy supply operation and the energy recovery operation in the conventional drive device of the plasma display panel. Referring to FIG. 7, since the switching time of energy supply and energy recovery is different from each other and the inductances of the energy supply paths and the energy recovery paths are different from each other in the driving apparatus of the conventional plasma display panel, the capacitor Css is stored as time passes. The voltage of the energized energy Vcss becomes smaller than Vs / 2. That is, in the energy supply operation (first state of FIG. 4), the first inductor L1 and L1 ′ are saturated because the inductance is made relatively smaller than that of the energy recovery operation (third state of FIG. 4). There is a possibility that the charge of Css) is lost, and in the energy recovery operation, the second inductor L2 or the first inductor L1 'and the second inductor are made through a relatively large inductance compared to the energy supply operation. There is a possibility that the energy stored in L2 'is relatively increased so that only a small amount of charge in the capacitor Css can be recovered to the capacitor Css. Therefore, there is a problem that the voltage of the energy supplied to the panel Cp becomes unstable and the driving becomes unstable.

In order to solve this problem, the present invention provides a plasma display panel driving apparatus for maintaining the voltage of energy stored in the energy storage unit at a constant Vs / 2 even if the inductance of the energy supply path and the inductance of the energy recovery path are different from each other. The purpose is to provide.

The present invention relates to a plasma display panel driving apparatus including an energy recovery circuit for sustain discharge when driving a plasma display panel, wherein energy stored in the energy storage unit is supplied to the panel through resonance with a supply path having a predetermined inductance, An inductor unit for recovering energy supplied to the panel to the energy storage unit through resonance with a recovery path having an inductance larger than the supply path, and an energy supply control unit for switching to supply energy to the panel through the inductor unit And a sustain voltage supply control unit for maintaining the sustain voltage at the panel at the sustain voltage Vs, an energy recovery control unit for switching the energy supplied to the panel through the inductor unit, and an external base station. From the pressure A base voltage supply control unit for supplying a base voltage to the panel at an urgent voltage, and a voltage holding unit for maintaining a constant voltage of energy stored in the energy storage unit at the sustain voltage Vs. .

The sustain voltage Vs is supplied from an external sustain voltage source, and the sustain voltage source supplies the sustain voltage Vs to the sustain voltage supply control unit and the voltage holding unit.

The voltage of the energy stored in the energy storage unit maintained by the voltage maintaining unit is a voltage (Vs / 2) of 0.5 times the sustain voltage (Vs).

The voltage holding unit has a capacitance equal to that of the energy storage unit.

The capacitance of the voltage storage unit and the energy storage unit is characterized in that the voltage (Vs / 2) of 0.5 times the sustain voltage (Vs).

One end of the voltage maintaining part is connected to an external sustain voltage source, and the other end is commonly connected to one end of the energy storage part, one end of the energy supply control part, and one end of the energy recovery control part.

The inductor unit may include a first inductor and a second inductor having different inductances.

The first inductor has an inductance smaller than the second inductor, one end of which is connected to the other end of the energy supply control unit, the other end of which the other end of the second inductor, the other end of the sustain voltage supply control unit, and the base voltage supply control unit Commonly connected to the other end and the panel Cp, the second inductor is characterized in that one end is connected to the other end of the energy recovery control unit.

The first inductor has an inductance greater than that of the second inductor, one end of which is connected to the other end of the energy recovery control unit, and the other end of which is commonly connected to the other end of the energy supply controller and one end of the second inductor. The inductor is characterized in that the other end is commonly connected with the other end of the sustain voltage supply control unit, the other end of the base voltage supply control unit, and the panel Cp.

The inductor unit may include a first inductor and a second inductor having the same inductance.

One end of the first inductor is connected to the other end of the energy recovery control unit, and the other end is commonly connected to the other end of the energy supply control unit and one end of the second inductor, and the other end of the second inductor is the sustain voltage supply control unit. The other end of the, characterized in that the common connection with the other end of the base voltage supply control unit and the panel (Cp).

Hereinafter, a driving apparatus of the plasma display panel of the present invention will be described in detail with reference to the accompanying drawings.

8 is a view showing an embodiment of a driving apparatus of a plasma display panel according to the present invention. As shown, one embodiment of the driving apparatus of the plasma display panel according to the present invention includes an energy recovery circuit for supplying and recovering energy to the panel (Cp), the energy recovery circuit is an energy storage unit 80, energy And a supply control unit 81, an inductor unit 82, a sustain voltage supply control unit 83, an energy recovery control unit 84, a base voltage supply control unit 85 and a voltage holding unit 86.

The energy storage unit 80 includes a supply and recovery capacitor Css in which energy necessary for sustain discharge is stored, and one end of the supply and recovery capacitor Css is the other end of the voltage holding unit 86, and an energy supply control unit ( 81 is commonly connected with one end of the energy recovery control unit 84. Here, the capacitance of the energy supply and recovery capacitor Css is more preferably Vs / 2.

The energy supply control unit 82 includes a first switch Q1 and a first diode D1, and the first switch Q1 is turned on to supply and recover capacitors of the energy storage unit 80. The energy stored in Css) is supplied to the panel Cp. The first diode D1 blocks the reverse current flowing from the panel Cp toward the supply and recovery capacitor Css via the first switch Q1. The first diode D1 has a cathode end connected to one end of the first inductor L1 included in the inductor 82, and an anode end connected to one end of the first switch Q1.

The inductor portion 82 constitutes a series LC resonant circuit with the panel Cp. Therefore, when the energy stored in the energy storage unit 80 is supplied to the panel Cp by the energy supply control unit 80, the panel Cp begins to be charged with the resonance waveform supplied through the inductor unit 82. Charged to sustain voltage Vs. In addition, when energy of the panel Cp is recovered to the energy storage unit 80, a reactive power recovery path is formed according to the turn-on of the third switch Q3. Therefore, the energy storage unit 80 is charged with the voltage component of the reactive power recovered via the inductor 82.

Here, the inductor unit 82 preferably includes a first inductor L1 and a second inductor L2 having inductances of different sizes, and the first inductor L1 and the second inductor L2 are energy. It is connected in parallel between the storage unit 80 and the panel Cp. In this case, assuming that the first inductor L1 has a smaller inductance than the second inductor L2, one end of the first inductor L1 is connected to the other end of the energy supply control unit 81, and the second inductor L2 is One end is connected to the other end of the energy recovery control unit 84, and the other end of the first inductor L1 and the second inductor L2 is connected in common to the sustain voltage supply control unit 83, the base voltage supply control unit 85, and the panel. Common connection with (Cp).

The sustain voltage supply control unit 83 includes a second switch Q2, one end of the second switch Q2 is connected to an external sustain voltage source for supplying a sustain voltage Vs, and the second switch Q2 is When the energy supplied to the panel Cp becomes the sustain voltage Vs, the panel Cp is turned on to maintain the sustain voltage Vs.

The energy recovery control unit 84 includes a third switch Q3 and a second diode D2, and the third switch Q3 is turned on so that a voltage component of reactive power during sustain discharge is generated by the energy storage unit 80. It is returned to the supply and recovery capacitors (Css). The second diode D2 blocks the reverse current flowing from the supply and recovery capacitor Css to the panel Cp via the third switch Q3. The second diode D2 has an anode end connected to one end of a second inductor L2 included in the inductor 82, and a cathode end connected to one end of the third switch Q3.

The base voltage supply control unit 85 includes a fourth switch Q4, one end of the fourth switch Q4 is connected to an external base voltage source GND, and energy is stored in the energy storage unit 80 Vs / 2. After being charged up to, the panel Cp is turned on to maintain the voltage value (0V) of the base voltage supplied by the base voltage source GND.

The voltage holding unit 86 includes a voltage adjusting capacitor Css ′, one end of the voltage adjusting capacitor Css ′ is connected to an external sustain voltage source supplying a sustain voltage Vs, and the other end thereof is an energy storage unit (Css ′). One end of the 80 is connected in common with one end of the energy supply control unit 81 and one end of the energy recovery control unit 84, and a voltage drop of Vs / 2 is applied to the energy storage unit 80 so as to take a voltage of Vs / 2. do. Here, the capacitance of the voltage regulating capacitor Css' is equal to the capacitance of the energy supply and recovery capacitor Css of the energy storage unit 80, and more preferably Vs / 2.

The driving method of the plasma display panel driving apparatus according to the present invention will be described with reference to FIG.

In the energy supplying step, the first switch Q1 is turned on and the remaining second to fourth switches Q2, Q3, and Q4 are all turned off. Therefore, the energy stored in the supply and recovery capacitor Css is supplied to the panel Cp. The energy supply path is made from the supply and recovery capacitor Css to the first switch-first diode-inductor 82-panel Cp.

In the sustain voltage sustain step, the second switch Q2 is turned on and the remaining first, third and fourth switches Q1, Q3 and Q4 are turned off. Accordingly, the sustain voltage Vs is applied and maintained to the panel Cp to maintain the sustain discharge.

In the energy recovery step, the third switch unit Q3 is turned on and the remaining first, second and fourth switches Q1, Q2 and Q4 are turned off. Accordingly, the reactive power voltage component of the panel is recovered as energy to the supply and recovery capacitor Css during sustain discharge. The path of the energy recovered as described above is composed of the panel Cp, the inductor 82, the second diode D2, the third switch Q3, and the supply and recovery capacitor Css. Here, when less than Vs / 2 energy is recovered and stored in the supply and recovery capacitor Css, the voltage holding unit 86 drops the sustain voltage Vs supplied from an external sustain voltage source by Vs / 2. By applying a voltage of Vs / 2 to the supply and recovery capacitor Css of the energy storage unit 80, the voltage of the energy stored in the supply and recovery capacitor Css is maintained at Vs / 2. That is, when energy is charged into the supply and recovery capacitor Css, energy of the Vs / 2 voltage is always charged.

In the base voltage maintenance and energy replenishment step, the fourth switch Q4 is turned on and the first and second switches Q1 and Q2 are turned off. In this case, the state of the third switch Q3 may be either turned off or turned on. Therefore, the voltage applied to the panel Cp becomes the ground level GND.

The energy recovery circuit included in the plasma display panel driving apparatus of the present invention driven in this manner is an energy supply step for supplying energy required for sustain discharge to the panel, that is, to improve resonance efficiency during ER-up of the sustain waveform. When supplying energy to Cp), the first inductor L1 having an inductance relatively smaller than the second inductor L2 is used. As a result, the voltage rise time can be relatively quick, and the discharge efficiency can be increased. A second inductor L2 having a larger inductance than the first inductor L1 is used in the energy recovery step of recovering reactive power not related to the discharge. Therefore, power consumption is reduced to increase driving efficiency.

In addition, the first inductor L1 is saturated by using a smaller inductance than the energy recovery step in the energy supply step, so that the charge of the capacitor Css is lost, or in the energy recovery step, compared to the energy supply step. By using a relatively large inductance, the energy stored in the second inductor L2 is relatively increased, so that the voltage holding unit 86 is external even if only a smaller amount of charge is recovered in the supply and recovery capacitor Css. Supply and recovery capacitors by dropping the sustain voltage (Vs) supplied from the sustain voltage source of Vs / 2 to apply a voltage of Vs / 2 to the supply and recovery capacitor Css of the energy storage unit 80. The voltage of the energy stored in (Css) is maintained at Vs / 2, so that the energy stored in the supply and recovery capacitor (Css) is supplied to the panel (Cp). In the supply phase, the driving is stabilized by supplying a constant voltage of energy to the panel at all times.

10 is a view showing another embodiment of a driving apparatus of a plasma display panel according to the present invention. As shown, another embodiment of the plasma display panel driving apparatus according to the present invention is that the structure of the inductor portion is changed compared to FIG. That is, in FIG. 8, a first inductor L1 and a second inductor L2 having inductances having different sizes are included, and the first inductor L1 and the second inductor L2 are formed of an energy storage unit 80. In another embodiment of the plasma display panel driving apparatus according to the present invention, the first inductor L1 ′ and the second inductor having the same or different sized inductance are provided. (L2 ') and one end of the first inductor (L1') is connected to the other end of the energy recovery control unit 104, the other end and the other end of the energy supply control unit 101 and one end of the second inductor (L2 ') The second inductor L2 ′ is connected in common and the other end of the second inductor L2 ′ is commonly connected to the other end of the sustain voltage supply control unit 103, the other end of the base voltage supply control unit 105, and the panel Cp. The first inductor L1 'and the second inductor L2' may have the same or different inductances. The reason is that the energy supply path for supplying the energy stored in the energy storage unit 100 to the panel Cp includes only the second inductor L2 'at the inductor unit 102, and the energy of the panel Cp stores the energy. The energy recovery path recovered to the unit 100 includes both the first inductor L1 ′ and the second inductor L2 ′ in the inductor unit 102 so that the inductance included in the energy recovery path is included in the energy supply path. This is because it is absolutely larger than inductance. However, preferably, the inductance of the first inductor L1 ′ is greater than the inductance of the second inductor L2 ′.

Another embodiment of the plasma display panel driving apparatus according to the present invention is an energy supplying step of supplying energy required for sustain discharge to the panel, that is, energy in the panel Cp to improve resonance efficiency during ER-up of the sustain waveform. In supply, a second inductor L2 'having a relatively small inductance is used. As a result, the voltage rise time can be made relatively quick, so that the discharge efficiency can be increased, and both the second inductor L2 'and the first inductance L1' are removed in the energy recovery step of recovering reactive power irrelevant to the discharge. By using relatively large inductance, the power consumption is reduced and the driving efficiency is increased.

In addition, the second inductor L2 'is saturated by using a smaller inductance than the energy recovery step in the energy supply step, and thus the charge of the capacitor Css is lost, or in the energy supply step in the energy recovery step. By using relatively large inductance, the energy stored in the first inductor L1 'and the second inductor L2' is relatively increased, so that only a small amount of electric charge is less than the capacitance in the supply and recovery capacitor Css. Even if recovered, the voltage holding unit 106 drops the sustain voltage Vs supplied from an external sustain voltage source by Vs / 2 to supply a recovery capacitor Css of the energy storage unit 100 to a voltage of Vs / 2. By this, the voltage of the supply and recovery capacitor Css is maintained at Vs / 2, whereby the energy stored in the supply and recovery capacitor Css is supplied to the panel Cp. In the energy supply stage, the driving is stabilized by supplying a constant voltage of energy to the panel at all times.

11 is a view for explaining the output voltage of the energy storage unit in the plasma display panel driving apparatus according to the present invention. Referring to FIG. 11, in the plasma display panel driving apparatus according to the present invention, even when switching times of energy supply and energy recovery are different, and inductances of the energy supply paths and the energy recovery paths are different, Css for supply and recovery are different. The voltage Vcss of energy stored in the Vs / 2 is kept constant. As a result, a constant energy can be supplied to the panel.

As described above, the technical configuration of the present invention described above will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. . Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described in detail above, the present invention can stabilize the driving by keeping the voltage of energy stored in the energy storage unit at Vs / 2 even if the inductance of the energy supply path and the inductance of the energy recovery path are different from each other. It has an effect.

Claims (11)

A plasma display panel driving apparatus comprising an energy recovery circuit for sustain discharge when driving a plasma display panel, Supply energy stored in the energy storage unit to the panel through resonance with a supply path having a predetermined inductance, and recover energy supplied to the panel to the energy storage unit through resonance with a recovery path having an inductance greater than the supply path. An inductor unit; An energy supply control unit configured to perform a switching operation so that energy is supplied to the panel through the inductor unit; A sustain voltage supply control unit for maintaining the sustain voltage at the panel at a sustain voltage Vs; An energy recovery control unit configured to perform a switching operation to recover energy supplied to the panel through the inductor unit; A base voltage supply control unit for supplying a base voltage to the panel with a voltage supplied from an external base voltage source; And And a voltage holding unit for maintaining a constant voltage of the energy stored in the energy storage unit at the sustain voltage (Vs). The method of claim 1, The sustain voltage Vs is supplied from an external sustain voltage source, The sustain voltage source is a plasma display panel driving apparatus, characterized in that for supplying a sustain voltage (Vs) to the sustain voltage supply control unit and the voltage holding unit. The method of claim 1, And a voltage (Vs / 2) of 0.5 times the sustain voltage (Vs) of the energy stored in the energy storage unit maintained by the voltage holding unit. The method of claim 1, The voltage holding unit, And a capacitance equal to that of the energy storage unit. The method of claim 4, wherein And the capacitance of the voltage storage unit and the energy storage unit is a voltage (Vs / 2) of 0.5 times the sustain voltage (Vs). The method of claim 1, The voltage holding unit, One end is connected to an external sustain voltage source, and the other end is connected in common with one end of the energy storage unit, one end of the energy supply control unit and one end of the energy recovery control unit. According to claim 1, The inductor unit, And a first inductor and a second inductor having different inductances. The method of claim 7, wherein The first inductor has a smaller inductance than the second inductor, one end of which is connected to the other end of the energy supply control unit, the other end of which is the other end of the second inductor, the other end of the sustain voltage supply control unit, and the base voltage supply control unit Common connection with the other end and panel (Cp) One end of the second inductor is connected to the other end of the energy recovery control unit plasma display panel driving device. The method of claim 7, wherein The first inductor has a larger inductance than the second inductor, one end is connected to the other end of the energy recovery control unit, the other end is commonly connected to the other end of the energy supply control unit and one end of the second inductor, The second inductor is plasma display panel driving apparatus, characterized in that the other end is commonly connected to the other end of the sustain voltage supply control unit, the other end of the base voltage supply control unit and the panel (Cp). According to claim 1, The inductor unit, And a first inductor and a second inductor having the same inductance. The method of claim 10, One end of the first inductor is connected to the other end of the energy recovery controller, and the other end is commonly connected to the other end of the energy supply controller and one end of the second inductor. The second inductor is plasma display panel driving apparatus, characterized in that the other end is commonly connected to the other end of the sustain voltage supply control unit, the other end of the base voltage supply control unit and the panel (Cp).

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