KR100647580B1 - Energy recovery circuit of plasma display panel and driving apparatus therewith - Google Patents

Abstract

The present invention relates to an apparatus for recovering power of a plasma display panel. A power recovery device of a plasma display panel is a power recovery device of a plasma display panel which resonates with a panel capacitor and recovers charge and discharge power according to a charge / discharge operation of a panel capacitor. With a switch. The resonant inductor is connected to one end of the panel capacitor and resonates during charge / discharge operation of the panel capacitor. The power recovery capacitor is connected in series with the resonant inductor to store power recovered by the resonance operation of the panel capacitor and the resonant inductor. The control switch is connected in series with a resonant inductor and a power recovery capacitor to control the recovery of the charge / discharge power. The control switch has a first control switch and a second control switch connected in series with each other such that directions of internal diodes formed therein are opposite to each other. The power recovery capacitor is connected between the first control switch and the second control switch. According to the present invention, since the power recovery is possible by changing only the arrangement of the power recovery switches without the path diode, the circuit configuration can be simplified.

Description

Power recovery device of plasma display panel and driving device of plasma display panel having same {Energy recovery circuit of plasma display panel and driving apparatus therewith}

1 is a perspective view showing an internal structure of a conventional three-electrode surface discharge plasma display panel.

FIG. 2 is a block diagram illustrating a general driving device of the plasma display panel of FIG. 1.

3 is a timing diagram illustrating driving signals applied to a panel of FIG. 1 in a unit subfield by an address-display separation driving method.

4 is a circuit diagram schematically showing a power recovery apparatus using a conventional external capacitor.

FIG. 5 is a waveform diagram illustrating switching driving of each control switch in the power recovery device illustrated in FIG. 1.

6 is a circuit diagram schematically showing a power recovery device as a preferred embodiment of the present invention.

FIG. 7 is a circuit diagram schematically illustrating a driving device of a plasma display panel including the power recovery device of FIG. 6.

FIG. 8 is a circuit diagram schematically illustrating current paths in mode 1 and mode 2 of the driving apparatus of the plasma display panel of FIG. 7.

FIG. 9 is a circuit diagram schematically illustrating current paths in modes 3 and 4 of the driving apparatus of the plasma display panel of FIG. 7.

FIG. 10 is a timing diagram schematically illustrating sustain driving by the driving apparatus of the plasma display panel of FIG. 7.

FIG. 11 is a waveform diagram schematically illustrating output of sustain discharge pulses by the driving apparatus of the plasma display panel of FIG. 7.

<Description of Symbols for Major Parts of Drawings>

50: power recovery device Cp: panel capacitor

Lr, L6, L7: resonant inductors Cr, C6, C7: power recovery capacitor

Dc, D6, D7: clamping diode Yerp, Yerg: control switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power recovery apparatus for a plasma display panel, and more particularly, to a power recovery apparatus for a plasma display panel in which a configuration of a conventional power recovery circuit is changed to reduce the number of necessary circuit elements, thereby simplifying the circuit configuration. It is about.

In general, a plasma display panel (PDP) is a light emitting device that displays an image by exciting a phosphor formed in a discharge cell, and because of the simple manufacturing process and the thin and large screen, the current status bulletin board, video conference display, and In recent years, as a display device used for a large wall-mounted television, the use thereof is increasing.

1 is a perspective view showing an internal structure of a conventional three-electrode surface discharge plasma display panel.

Referring to the drawings, between the front and rear glass substrates 10 and 13 of the conventional surface discharge plasma display panel 1, the address electrode lines A _R1 , A _G1 , ..., A _Gm , A _Bm ), Dielectric layers 11 and 15, Y electrode lines (Y ₁ , ..., Y _n ), X electrode lines (X ₁ , ..., X _n ), fluorescent layer 16, partition wall 17 ) And a magnesium monoxide (MgO) layer 12 as a protective layer.

The address electrode lines A _R1 , A _G1 ,..., A _Gm , A _Bm are formed in a predetermined pattern on the front side of the rear glass substrate 13. The lower dielectric layer 15 is entirely applied in front of the address electrode lines A _R1 , A _G1 ,..., A _Gm , A _Bm . In front of the lower dielectric layer 15, barrier ribs 17 are formed in a direction parallel to the address electrode lines A _R1 , A _G1 ,..., A _Gm , A _Bm . These partitions 17 function to partition the discharge area of each discharge cell and to prevent optical cross talk between each discharge cell. The fluorescent layer 16 is formed between the partition walls 17.

The X electrode lines (X ₁ , ..., X _n ) and the Y electrode lines (Y ₁ , ..., Y _n ) are the address electrode lines (A _R1 , A _G1 , ..., A _Gm , A _Bm ) is formed in a predetermined pattern on the back of the front glass substrate 10 to be orthogonal to each other. Each intersection sets a corresponding discharge cell. Each X electrode line (X ₁ , ..., X _n ) and each Y electrode line (Y ₁ , ..., Y _n ) have a conductivity and a transparent electrode line made of a transparent conductive material such as indium tin oxide (ITO). Metal electrode lines for heightening are formed in combination. The front dielectric layer 11 is formed by applying the entire surface to the rear of the X electrode lines X ₁ ,..., X _n and the Y electrode lines Y ₁ ..., Y _n . A protective layer 12 for protecting the panel 1 from a strong electric field, for example, a magnesium monoxide (MgO) layer, is formed by applying the entire surface to the back of the front dielectric layer 11. The plasma forming gas is sealed in the discharge space 14.

As a driving method of the plasma display panel 1 having the structure described above, an address-display separation driving method which is mainly used is disclosed in US Pat.

FIG. 2 is a block diagram illustrating a general driving device of the plasma display panel of FIG. 1.

Referring to the drawings, a typical driving device of the plasma display panel 1 includes an image processor 26, a controller 22, an address driver 23, an X driver 24, and a Y driver 25. The image processing unit 26 converts an external analog image signal into a digital signal to convert an internal image signal, for example, 8 bits of red (R), green (G), and blue (B) image data, a clock signal, vertical and Generate horizontal sync signals. The controller 22 generates driving control signals S _A , S _Y , and S _X according to an internal image signal from the image processor 26. The address driver 23 generates the display data signal by processing the address signal S _A among the drive control signals S _A , S _Y , and S _X from the controller 22, and generates the display data signal. Applied to the address electrode lines. The X driver 24 processes the X driving control signal S _X among the driving control signals S _A , S _Y , and S _X from the controller 22 and applies the X driving control signal S _X to the X electrode lines. The Y driver 25 processes the Y driving control signal S _Y among the driving control signals S _A , S _Y , and S _X from the controller 22 and applies the Y driving control signal S _Y to the Y electrode lines.

3 is a timing diagram illustrating driving signals applied to a panel of FIG. 1 in a unit subfield by an address-display separation driving method.

In FIG. 3, reference numeral S _{AR1 ..ABm} denotes a driving signal applied to each address electrode line (A _R1 , A _G1 ,..., A _Gm , A _Bm of FIG. 1), and S _{X1 .. Xn} denotes an X electrode. The driving signal applied to the lines (X ₁ , ... X _{n in} FIG. 1), and S _Y1 , ..., S _Yn are the respective Y electrode lines (Y ₁ , ... Y _{n in} FIG. 1). Indicates a drive signal applied to.

Referring to the drawing, in the reset period PR of the unit sub-field SF, first, the voltage applied to the X electrode lines X ₁ ,..., X _n is set from the ground voltage V _G to the second. for the voltage (V _S) for example, then continue to rise to 155 volts (V). Here, the ground voltage V _G is applied to the Y electrode lines Y ₁ ,..., Y _n and the address electrode lines A _R1 ,..., A _Bm . Accordingly, between the X electrode lines (X ₁ , ..., X _n ) and the Y electrode lines (Y ₁ , ..., Y _n ), and the X electrode lines (X ₁ , ..., X) A weak discharge occurs between _n ) and the address electrode lines A ₁ , ..., A _m , and negative wall charges are formed around the X electrode lines X ₁ , ..., X _n . .

Next, the voltage applied to the Y electrode lines Y ₁ ,..., Y _n is third from the second voltage V _S , for example, from 155 volts V to a second voltage than the second voltage V _S. The highest voltage V _SET + V _{S that} is as high as the voltage V _SET is continuously raised to, for example, 355 volts (V). Here, the ground voltage V _G is applied to the X electrode lines X ₁ ,..., X _n and the address electrode lines A _R1 ..., A _Bm . Accordingly, a weak discharge occurs between the Y electrode lines (Y ₁ ,..., Y _n ) and the X electrode lines (X ₁ ,..., X _n ), while the Y electrode lines (Y ₁ , A weaker discharge occurs between ..., Y _n ) and the address electrode lines A _R1 , ..., A _Bm .

Next, in the state where the voltage applied to the X electrode lines X ₁ ,..., X _n is maintained at the second voltage V _S , the Y electrode lines Y ₁ ,..., Y _n The voltage applied to) is continuously lowered from the second voltage V _S to the ground voltage V _G. Here, the ground voltage V _G is applied to the address electrode lines A _R1 ,..., A _Bm .

Accordingly, in the address period (PA), leading address is applied to a display data signal to the electrode lines, the the second voltage (V _S) lower fourth voltage (V _SCAN) to bias the Y-electrode line than the (Y ₁ As a scan signal of the ground voltage V _G is sequentially applied to the ..., Y _n ), smooth addressing may be performed. The display data signal applied to each of the address electrode lines A _R1 , ..., A _Bm is applied with the positive address voltage V _A when the discharge cell is selected and the ground voltage V _G when the discharge cell is not selected. do. Accordingly, when the display data signal of the positive address voltage V _A is applied while the scan pulse of the ground voltage V _G is applied, wall charges are formed by the address discharge in the corresponding discharge cell. Wall charges do not form. Here, the second voltage (V _S) on to the more accurate and efficient address discharge, the X electrode lines (X _1, ... X _n) applied.

In the sustain discharge period PS that follows, the display of the second voltage V _S is maintained on all the Y electrode lines Y ₁ , ... Y _n and the X electrode lines X ₁ , ... X _n . The pulses are alternately applied, causing a discharge for maintaining the display in the discharge cells in which wall charges are formed in the corresponding address period PA.

When driving the plasma display panel, high voltages equal to or higher than the discharge start voltage of the discharge gas must be continuously applied between sustain electrodes (X electrode and Y electrode) in the discharge cell. In this case, a dielectric is coated on the sustain electrode, and thus, a panel capacitor, which is a certain amount of capacitive component, exists in the X electrode and the Y electrode as the sustain electrode of the plasma display panel.

Therefore, in order to alternately apply high voltages of the positive electrode (+) and the negative electrode (−) between the sustain electrodes when the plasma display panel is driven, the panel capacitor should be charged and discharged. In this case, the panel capacitor consumes a considerable amount of reactive power during charging and discharging operation, and the panel capacitor increases in proportion to the size of the display panel, thereby further increasing its power consumption.

In order to solve this problem, US Patent No. 4,866,349 applies a power recovery device to the driving device to reduce the power loss generated during the charging and discharging operation of the panel capacitor.

4 is a circuit diagram schematically showing a power recovery apparatus using a conventional external capacitor.

Referring to the drawings, the conventional power recovery circuit 30 includes an inductor L1 which forms an LC resonant circuit together with the panel capacitor Cp of the display panel, and is lost when the panel capacitor Cp is discharged. After the energy is recovered through the inductor L1 and temporarily stored, the stored current energy is used during the next charging operation of the panel capacitor Cp, thereby reducing the loss of reactive power generated when the plasma display panel is driven. Circuit.

This shows a configuration of a conventional power recovery apparatus using an external capacitor, which maintains and drives the plasma display panel at the sustain voltage Vs, recovers energy lost during the discharge operation of the panel capacitor Cp, and then charges the battery. The first and second power recovery units 30 and 40 for supplying the energy recovered during the operation to the panel capacitor Cp, the first and second power recovery units 30 and 40 are panel capacitor ( It is constructed symmetrically with Cp) in between.

In addition, in the first and second power recovery units 30 and 40, the voltage Vp at both ends of the panel capacitor Cp alternates between the positive electrode (+) and the negative electrode (−) during the charge / discharge operation of the panel capacitor Cp. Each of them should work alternately.

In the drawing, the first power recovery unit 30 controls the control switch S1 for supplying the sustain voltage Vs to the panel capacitor Cp during the sustain driving of the display panel, and the charge / discharge operation of the panel capacitor Cp. To store energy recovered during the resonance operation of the inductor L1 resonant with the inductor L1, the backflow prevention diodes D15 and D16 to prevent the reverse flow of the resonance current, and the inductor L1 and the panel capacitor Cp. And a control switch (S11, S12) connected between the capacitor (C1) and the panel capacitor (Cp) and the external capacitor (C1) to switch the energy recovery path.

FIG. 5 is a waveform diagram illustrating switching driving of each control switch in the power recovery device illustrated in FIG. 1.

Referring to the drawings, the voltage waveform across the panel capacitor Cp and the current waveform flowing through the inductor L1 according to the switching driving of each control switch in the conventional power recovery apparatus are shown in (I) and (II) on the drawings, respectively. As it is.

First, the conventional power recovery apparatus is configured to reduce the loss due to reactive power generated by discharging the charge charge of the panel capacitor Cp after the driving operation of the plasma display panel after the system power is applied. In addition, energy transfer during the charge / discharge operation of the panel capacitor Cp is performed through a resonance operation between the panel capacitor Cp and the inductor L1.

In addition, the operation of the power recovery device is divided into four sections (T1 ~ T4) as shown in the drawing, the operation of the second power recovery unit 40 is described below the first power recovery unit 30 ) In the same way.

First, the charging energy of the panel capacitor Cp is stored in the external capacitor C1 through a resonance operation with the inductor L1.

Next, a resonant current i1 of the inductor L1 and the panel capacitor Cp is formed from the external capacitor C1 in the first power recovery unit 30, and the panel capacitor Cp is formed by the resonant current i1. The voltage Vp at both ends of the voltage rises to the sustain voltage Vs as shown in (I). At this time, the control switch S11 is driven on to provide a current path (T1 section).

Next, the control switch S1 is turned on for sustain driving of the plasma display panel, and the sustain voltage Vs is continuously applied to the voltage Vp at both ends of the panel capacitor Cp.

Next, after the sustain driving of the display panel, the inductor L1 and the panel capacitor Cp resonate during the discharging operation of the panel capacitor Cp, so that the charging energy of the panel capacitor Cp is reduced in the first power recovery unit 30. Recovered to an external capacitor C1. At this time, the control switch S12 is driven on to provide a current path (T3 section).

Next, the control switch S2 is driven on, and the voltage Vp at both ends of the panel capacitor Cp maintains a zero potential. (T4 section)

At this time, the voltage Vp at both ends of the panel capacitor Cp in the T1 period is inductor L1 and the panel capacitor Cp from the external capacitor C1 charged with Vs / 2 corresponding to half of the sustain voltage Vs. By the resonant operation of), the voltage rises up to the sustain voltage (Vs). In reality, a loss (Δ) caused by the line resistance to the panel and the resistance component (parasitic resistance) of the elements in the circuit is generated, and the discharge before the sustain driving of the display panel occurs. According to the phenomenon, the energy recovery efficiency and the driving characteristics of the panel are reduced.

In particular, in the case of the power recovery device of the conventional display panel, the number of circuit elements required for the configuration of the power recovery device is required more than necessary, thereby increasing the volume of the power recovery device and increasing the manufacturing cost.

In addition, since the heat sink used for heat dissipating the path diode located on the power recovery path occupies a substantial portion of the entire area of the driving circuit, there is a problem that the overall heat dissipation structure may be poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a power recovery apparatus of a plasma display panel in which a circuit configuration is simplified by removing a diode located on a power recovery path in a conventional power recovery circuit.

In order to achieve the above object, in the power recovery apparatus of the plasma display panel according to the present invention, discharge cells are formed in regions where X electrode lines, Y electrode lines, and address electrode lines are alternately arranged side by side, A plasma display panel in which a panel capacitor is formed between at least two electrode lines among the electrode lines, resonates with the panel capacitor to recover charge / discharge power according to the charge / discharge operation of the panel capacitor. A power recovery apparatus, comprising a resonant inductor, a power recovery capacitor, and a control switch.

The resonant inductor is connected to one end of the panel capacitor and resonates during charge / discharge operation of the panel capacitor. The power recovery capacitor is connected in series with the resonant inductor to store power recovered by the resonance operation of the panel capacitor and the resonant inductor. The control switch is connected in series with the resonant inductor and the power recovery capacitor to control the recovery of the charge / discharge power. The control switch has a first control switch and a second control switch connected in series with each other such that directions of internal diodes formed therein are opposite to each other. The power recovery capacitor is connected between the first control switch and the second control switch.

The power recovery device of the plasma display panel may further include a clamping diode connected to the resonance inductor in parallel with the power recovery capacitor and the control switch.

According to the present invention, since the power recovery is possible by changing only the arrangement of the power recovery switches without the path diode, the circuit configuration can be simplified.

In the driving apparatus of the plasma display panel according to another aspect of the present invention, discharge cells are formed in regions where X electrode lines and Y electrode lines and address electrode lines that are alternately arranged side by side intersect each other, and at least among the electrode lines. In the plasma display panel having a panel capacitor formed between two electrode lines, the plasma display panel includes a power recovery unit resonating with the panel capacitor to recover charge and discharge power according to the charge / discharge operation of the panel capacitor. A drive apparatus includes a sustain drive section and a power recovery section.

The sustain driver is connected to a power supply terminal, is switched according to an external control signal to supply a sustain voltage to the panel capacitor to sustain drive the display panel, and periodically discharges the charging power.

The power recovery unit includes a resonant inductor, a power recovery capacitor, and a control switch. The resonant inductor is connected to one end of the panel capacitor and resonates during charge / discharge operation of the panel capacitor. The power recovery capacitor is connected in series with the resonant inductor to store power recovered by the resonance operation of the panel capacitor and the resonant inductor. The control switch is connected in series with the resonant inductor and the power recovery capacitor to control the recovery of the charge / discharge power. The control switch has a first control switch and a second control switch connected in series with each other such that directions of internal diodes formed therein are opposite to each other. The power recovery capacitor is connected between the first control switch and the second control switch.

Preferably, the power recovery unit includes first and second power recovery units symmetrically connected to both ends of the panel capacitor.

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

6 is a circuit diagram schematically showing a power recovery device as a preferred embodiment of the present invention.

Referring to the drawings, the power recovery apparatus 50 of the plasma display panel according to the preferred embodiment of the present invention, the X electrode lines (X ₁ ,..., X _n of FIG. 1) alternately arranged side by side and Discharge cells are formed in a region where Y electrode lines (Y ₁ ,..., Y _n in FIG. 1) and address electrode lines (A _R1 ,..., A _{Bm in} FIG. 1) cross each other. For a plasma display panel in which a panel capacitor Cp is formed between at least two electrode lines among the lines, the panel capacitor Cp is resonated with the panel capacitor Cp in accordance with the charge / discharge operation of the panel capacitor Cp. The resonant inductor Lr, the power recovery capacitor Cr, and the control switches S51 and S52 are provided.

The resonant inductor Lr is connected to one end of the panel capacitor Cp and resonates during charge / discharge operation of the panel capacitor Cp. The power recovery capacitor Cr is connected in series with the resonant inductor Lr to store power recovered by the resonance operation of the panel capacitor Cp and the resonant inductor Lr. The control switches S51 and S52 are connected in series with the resonant inductor Lr and the power recovery capacitor Cr to control the recovery of the charge / discharge power. The control switches S51 and S52 include a first control switch S51 and a second control switch S52 which are connected in series to each other such that the directions of the internal diodes formed inside each other are opposite to each other.

The panel capacitor Cp, the resonant inductor Lr, the power recovery capacitor Cr, and the control switches S51 and S52 are connected in series, so that the charge remaining in the panel capacitor Cp is transferred to the power. A path for recovering the recovery capacitor Cr and charging the recovered charge back to the panel capacitor Cp is formed.

It is preferable that the said control switch S51, S52 is equipped with the 1st control switch S51 and the 2nd control switch S52. The first control switch S51 controls the start and end of series resonance of the power recovery capacitor Cr and the resonant inductor Lr, and the second control switch S52 is connected to the power recovery capacitor Cr. Controls the charge of charge required for series resonance.

The switches including the first and second control switches S51 and S52 are each composed of an internal diode in anti-parallel connection with a metal oxide semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT). Gate Bipolar Transistor). In this embodiment, a switch composed of a MOSFET and an internal diode was used.

At this time, it is preferable that the first control switch S51 and the second control switch S52 are connected in series so that the directions of the internal diodes formed in the respective control switches S51 and S52 are opposite to each other. Do.

Accordingly, when both the first control switch S51 and the second control switch S52 are opened, the power recovery capacitor Cr is not electrically connected to the resonant inductor Lr.

In addition, the power recovery capacitor Cr may be connected between the first control switch S51 and the second control switch S52. Accordingly, the power recovery capacitor Cr is not electrically connected to other elements in the circuit when both the first control switch S51 and the second control switch S52 are opened.

According to the present invention, in the conventional power recovery apparatus as shown in FIG. 4, only the arrangement of the power recovery switches is used without using the backflow prevention diodes (D15 and D16 in FIG. 4) to prevent the reverse flow of the resonance current. It is possible to change the power recovery and charging.

Therefore, the charging and discharging power of the panel capacitor Cp can be recovered and charged with a simple circuit configuration.

In addition, since the number of circuit elements required for the power recovery device is reduced, the cost for manufacturing the power recovery device can be reduced.

Since the heat sink used for heat dissipating the path diode located on the power recovery path occupies a substantial portion of the entire area of the driving circuit, the overall heat dissipation structure is poor. Therefore, according to the present invention, it is possible to improve the heat dissipation structure of the entire driving circuit by removing the path diode.

Preferably, the power recovery device 50 of the plasma display panel further includes a clamping diode Dc. The clamping diode Dc is connected to the resonant inductor Lr in parallel with the power recovery capacitor Cr and the control switches S51 and S52. The clamping diode Dc clamps the overshoot and undershoot of the sustain discharge pulse in order to prevent the power applied to the panel capacitor Cp from being above a predetermined voltage or below a predetermined voltage. (clamping)

The power recovery device 50 of the plasma display panel according to the present invention may be applied to various driving units such as an address driver or a sustain driver for charging and discharging the panel capacitor Cp formed in the display panel.

FIG. 7 is a circuit diagram schematically illustrating a driving device of a plasma display panel including the power recovery device of FIG. 6.

Referring to the drawings, the driving device of the plasma display panel includes X electrode lines (X ₁ ,..., X _n in FIG. 1) and Y electrode lines (Y ₁ ,. , Y _n ) and discharge cells are formed in a region where the address electrode lines (A _R1 , ..., A _{Bm in} FIG. 1) intersect, and a panel capacitor is formed between at least two electrode lines among the electrode lines. The plasma display panel having the sig- nals is resonated with the panel capacitor to recover charge and discharge power according to the charge / discharge operation of the panel capacitor. The sustain display unit 80 and the power recovery units 60 and 70 are provided. do.

In this case, the driving apparatus of the plasma display panel according to the present invention may be applied to various driving units such as an address driving unit or a sustain driving unit for charging and discharging the panel capacitor Cp formed in the display panel. The description centers on. In addition, the same components as the power recovery device of FIG. 6 have the same function, and a detailed description thereof will be omitted.

The sustain driver 80 is connected to a power supply terminal, is switched according to an external control signal to supply a sustain voltage to the panel capacitor Cp to sustain drive the display panel, and periodically discharges the charging power.

The power recovery units 60 and 70 include a first power recovery 60 and a second power recovery unit 70 which are symmetrically connected to both ends of the panel capacitor Cp.

The first and second power recovery units 60 and 70 include resonant inductors L6 and L7, power recovery capacitors C6 and C7, and control switches Yerp, Yerg, Xerp, and Xerg.

The resonant inductors L6 and L7 are connected to one end of the panel capacitor Cp and resonate during the charge / discharge operation of the panel capacitor Cp. The power recovery capacitors C6 and C7 are connected in series with the resonant inductors L6 and L7 to store power recovered by the resonance operation of the panel capacitor Cp and the resonant inductors L6 and L7. . The control switches Yerp, Yerg, Xerp, and Xerg are connected in series with the resonant inductors L6 and L7 and the power recovery capacitors C6 and C7 to control the recovery of the charge / discharge power.

The control switches (Yerp, Yerg, Xerp, Xerg), the first control switch (Yerp, Xerp) and the second control switch (Yerg, which are connected in series with each other so that the direction of the internal diodes formed therein are opposite to each other Xerg).

The sustain driving unit 80 includes first and second switches Ys and Yg, one end of which is connected to each other and commonly connected to the Y electrode lines, and one end of each of which is connected to the X electrode lines. Third and fourth switches Xs and Xg connected in common are provided.

In this case, the first power recovery unit 60 is connected to the Y electrode lines, is connected to the connection of the first switch (Ys) and the second switch (Yg), the second power recovery unit 70 It is connected to the X electrode lines, it is connected to the connection of the third switch (Xs) and the fourth switch (Xg).

The first switch Ys should not be turned on at the same time as the second control switch Yerg of the first power recovery unit 60. Since the signals applied to the first switches Ys have opposite timings, one signal is used. Can be controlled.

In addition, the third switch Xs should not be turned on at the same time as the second control switch Xerg of the second power recovery unit 70. Since the signals applied to the third switches Xs have opposite timings, one signal Can be controlled using.

In addition, it is preferable that the driving device of the plasma display panel further includes clamping diodes D6, D7, D51, and D52. In this case, the clamping diodes D6 and D7 are connected to the resonant inductors L6 and L7 in parallel with the power recovery capacitors C6 and C7 and the control switches Yerp, Yerg, Xerp and Xerg, respectively. The clamping diodes D51 and D52 are connected in parallel with the first and third switches Ys and Xs with respect to the sustain voltage Vs applied thereto. The clamping diodes D6, D7, D51, and D52 may include an overshoot of a sustain discharge pulse to prevent the power applied to the panel capacitor Cp from being above a predetermined voltage or below a predetermined voltage. Clamp the undershoot.

In addition, the power recovered by the power recovery capacitors C6 and C7 may be charged to a voltage level Vs / 2 corresponding to half of the voltage level Vs of the sustain voltage. That is, the level of the full charge voltage of the power recovery capacitors C6 and C7 is half of the sustain voltage level Vs. Accordingly, the first to fourth switches Ys, Yg, Xs, and Xg each receive the same Vs voltage as the sustain discharge voltage, whereas the control switches Yerp, Yerg, Xerp, and Xerg of the power recovery unit have Vs / 2. Voltage is applied. Therefore, it is possible to reduce the cost of the circuit configuration by enabling the switches used for power recovery to use low-voltage components.

According to the driving apparatus of the plasma display panel according to the present embodiment, a pulse voltage is alternately applied between the Y electrode lines and the X electrode lines to cause display discharge in selected discharge cells, and the drop time of the pulse voltage is reduced. Charges collected in the discharge cell are charged in the panel at the time when the pulse voltage rises.

The operation of the driving apparatus of the plasma display panel according to the present invention will be described below.

FIG. 8 is a circuit diagram schematically illustrating current paths in mode 1 and mode 2 of the driving apparatus of the plasma display panel of FIG. 7. FIG. 9 is a circuit diagram schematically illustrating current paths in modes 3 and 4 of the driving apparatus of the plasma display panel of FIG. 7. FIG. 10 is a timing diagram schematically illustrating sustain driving by the driving apparatus of the plasma display panel of FIG. 7. FIG. 11 is a waveform diagram schematically illustrating output of sustain discharge pulses by the driving apparatus of the plasma display panel of FIG. 7.

Referring to the drawings, in the driving apparatus of the plasma display panel, after the system power is applied, and after the sustain driving of the plasma display panel, the loss caused by the reactive power generated by discharging the charging charge of the panel capacitor Cp again is eliminated. It is configured to reduce. In addition, energy transfer during the charge / discharge operation of the panel capacitor Cp is performed through a resonance operation between the panel capacitor Cp and the inductors L6 and L7.

In addition, the operation of the power recovery device is divided into four sections (M1 ~ M4) as shown in the drawing, the operation of the second power recovery unit 70 is described below the first power recovery unit 60 ) In the same way. Therefore, the description of the operation of the second power recovery unit 70 is omitted.

First, the charging energy of the panel capacitor Cp is stored in the power recovery capacitor C6 through a resonance operation with the inductor L6.

Next, the first control switch (Yerp) and the second control switch (Yerg) are driven on, and the M1 current path of FIG. 8 is formed. (M1 section) Power cycle in the first power recovery unit 60 Resonant currents of the inductor L6 and the panel capacitor Cp are formed from the accommodating capacitor C6, and the voltage Vp across the panel capacitor Cp increases to the sustain voltage Vs by the resonance current.

Next, the first switch Ys is turned ON to maintain the plasma display panel, thereby forming the M2 current path of FIG. 8. In this case, the voltage Vp at both ends of the panel capacitor Cp is formed. The sustain voltage Vs is continuously applied. At this time, the first switch Ys should not be turned on at the same time as the second control switch Yerg, and since the two signals have opposite timings to each other, it is possible to control using one signal.

Next, the first switch Ys is driven OFF and the second control switch Yerg is driven ON to form the M3 current path of FIG. 9 (M3 section). After the sustain driving, the inductor L6 and the panel capacitor Cp resonate during the discharging operation of the panel capacitor Cp, and the charging energy of the panel capacitor Cp is reduced by the power recovery capacitor of the first power recovery unit 60. C6). The first control switch Yerp is conducted through the internal diode irrespective of the control signal.

Next, the second switch Yg is driven on, and the M4 current path of FIG. 9 is formed, so that the ground potential state of both the X electrode and the Y electrode is maintained. (M4 section) At this time, the voltage across the panel capacitor Cp (Vp) maintains the ground potential. The M4 section may be shortened, lengthened or removed depending on the timing of the control signal.

In Fig. 11, (I) represents the X output and (II) represents the Y output. (II) shows a current waveform flowing through the resonant inductor L6 of the Y electrode.

According to the power recovery apparatus of the plasma display panel according to the present invention, since the path diode required for the power recovery circuit is eliminated without any additional parts, and only the power recovery switches are changed, the power recovery is possible, thereby simplifying the circuit configuration. Can be.                     

In addition, since the number of circuit elements required for the power recovery device is reduced, the cost for manufacturing the power recovery device can be reduced.

Although the present invention has been described with reference to one embodiment shown in the accompanying 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. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (11)

Plasma display panels in which discharge cells are formed in regions where X electrode lines and Y electrode lines and address electrode lines intersect alternately, and a panel capacitor is formed between at least two electrode lines among the electrode lines. In the power recovery device of the plasma display panel which resonates with the panel capacitor and recovers charge / discharge power according to the charge / discharge operation of the panel capacitor. A resonant inductor connected to one end of the panel capacitor and resonating during charge / discharge operation of the panel capacitor; A power recovery capacitor connected in series with the resonant inductor to store power recovered by the resonance operation of the panel capacitor and the resonant inductor; And The first control switch and the second control switch connected in series with the resonant inductor and the power recovery capacitor to control the recovery of the charge / discharge power. A control switch having a control switch, And a power recovery capacitor connected between the first control switch and the second control switch. delete The method of claim 1, And a clamping diode connected to the resonant inductor in parallel with the power recovery capacitor and the control switch. Plasma display panels in which discharge cells are formed in regions where X electrode lines and Y electrode lines and address electrode lines intersect alternately, and a panel capacitor is formed between at least two electrode lines among the electrode lines. In the driving apparatus of the plasma display panel having a power recovery unit for resonating with the panel capacitor to recover the charge and discharge power in accordance with the charge and discharge operation of the panel capacitor, A sustain driver connected to a power supply terminal and switched according to an external control signal to supply a sustain voltage to the panel capacitor to sustain drive the display panel, and periodically discharge the charging power; A resonant inductor connected to one end of the panel capacitor and resonating during charge / discharge operation of the panel capacitor, and connected in series with the resonant inductor to store power recovered by the resonant operation of the panel capacitor and the resonant inductor; It is connected in series with the power recovery capacitor, and the resonant inductor and the power recovery capacitor to control the recovery of the charge and discharge power, which are connected in series so that the direction of the internal diode formed in each of them is opposite to each other A power recovery unit including a control switch including first and second control switches, And the power recovery capacitor is connected between the first control switch and the second control switch. The method of claim 4, wherein And a first and a second power recovery section, the power recovery section being symmetrically connected to both ends of the panel capacitor. The method of claim 5, The sustain driving unit includes first and second switches having one end connected to each other and commonly connected to the Y electrode lines, and third and fourth ends connected to each other and connected to the X electrode lines. A drive device of a plasma display panel having a switch. The method of claim 6, And the first power recovery unit is connected to the Y electrode lines, and operating states of the first switch and the second control switch of the first power recovery unit are opposite to each other. The method of claim 6, And the second power recovery unit is connected to the X electrode lines, and operating states of the third switch and the second control switch of the second power recovery unit are opposite to each other. The method of claim 4, wherein And a full charge voltage level of the power recovery capacitor is half of the sustain voltage level. The method of claim 4, wherein And a clamping diode connected to the resonant inductor in parallel with the power recovery capacitor and the control switch. delete

Images