CN101013554A - Apparatus and method for driving plasma display panel - Google Patents

Abstract

According to the method for driving a plasma display panel including the first electrode and the second electrode and a panel capacitor formed therebetween. The voltage of the first electrode is changed into the second voltage using resonance between the first inductor and the panel capacitor, while the voltage of the second electrode is maintained as the first voltage. The first inductor connects to the first electrode, while the voltages of the first and the second electrode are maintained as the second and the first voltage. The voltage of the first electrode is changed into the first voltage using resonance between the first inductor and the panel capacitor, while the voltage of the second electrode is maintained as the first voltage and the second inductor connects to the first electrode. And the voltages of the first and the second electrode are maintained as the first voltage respectively.

Description

Drive the equipment and the method for plasma display panel

The application is that name is called " equipment and the method that drive plasma display panel " (application number: 200310123322.7; The applying date: the dividing an application of application on October 11st, 2003)

The application requires the right of priority of the korean patent application 2002-62095 and the korean patent application 2002-70383 on November 13rd, 2002 on October 11st, 2002, and the content of these two korean patent applications is incorporated herein by reference.

Technical field

The present invention relates to the driving arrangement and the driving method of plasma display panel (PDP), particularly comprise the driving circuit of power supply recovery circuit.

Background technology

Plasma display panel (PDP) is to utilize the Plasma Display character that gas discharge produces or the flat-panel monitor of image, according to its size, comprises tens to millions of pixels by the configuration of matrix figure.PDP can according to the structure of its discharge cell with adding driving voltage waveform separation become once-through type (DC) or AC type (AC).

DC PDP has the electrode that is exposed in the discharge space, allows DC to flow through discharge space when making alive, therefore, requires current-limiting resistance.AC PDP has the electrode that covers with dielectric layer, is used to form capacity cell, with restriction electric current and guard electrode in discharge process not by ionic bombardment, therefore, ACPDP has the life-span longer than DCPDP usually.

The side of AC PDP has the scanning and the lasting electrode of parallel formation, and the opposite side of ACPDP has the address electrode perpendicular to scanning and lasting electrode.Continue electrode and form corresponding to scan electrode, an end that continues electrode is connected to an end of each scan electrode.

The driving method of ACPDP generally includes: reset cycle chronologically, addressing period, lasting cycle and erase cycle.

Reset cycle is used to start the state of each unit, so that carry out addressing operation.Addressing period is used to select the conduction and cut-off unit, and adds address voltage for onunit (promptly the unit of addressing), with accumulation wall electric charge.The lasting cycle is used to add lasting pulse, and causes continuous discharge, with display image on the unit of addressing.Erase cycle is used to reduce the wall electric charge of unit, to stop continuous discharge.

Between scanning and the lasting electrode and have PDP one side of address electrode and have discharge space between scanning and lasting electrode one side and be used as capacitance load (below be called " planar capacitor ").Therefore, on flat board, there is electric capacity.Because the electric capacity of plate condenser is that to apply the reactive power of the waveform that is used for continuous discharge necessary.Therefore, the PDP driving circuit comprises the power supply recovery circuit, is used to reclaim reactive power and reuses it.Belong to U.S. Pat-P of people such as Weber (below be called " Weber "), No.4866349 and No.5081400 disclose a kind of power supply recovery circuit.

Disclosed circuit transmits dull and stereotyped energy repeatedly to power supply recovery capacitor among the Weber, and perhaps, the energy that will be stored in the power supply recovery capacitor with the resonance between plate condenser and the inductor is sent to flat board repeatedly.The useful power of recovery circuit thus.But in this circuit, the rising time of plate voltage and reduction time are depended on the inductance value L of inductor and the determined time constant LC of electric capacity C of plate condenser.The rising time of plate voltage equals the reduction time, because time constant LC is constant.With regard to the time of rising faster of plate voltage, in the process that plate voltage raises, the switch that is connected to power supply is a hard switching, and wherein, the stress of switch increases.Hard switching operation also can causing electrical piano power loss and electromagnetic interference (EMI) effect increase.

Summary of the invention

The invention provides a kind of PDP driving circuit that plate voltage raises and reduces of controlling.

The present invention provides the PDP driving circuit by independent mode control X electrode and Y electrode respectively.

The present invention is provided for having driving arrangement and the driving method of the PDP of first electrode that forms plate condenser therebetween and second electrode respectively.

According to an aspect of the present invention, the driving method of plasma display panel is provided, plasma display panel has first electrode and second electrode that forms plate condenser therebetween, method comprises that the electric current with first direction is injected into the inductor that is connected to first electrode, to store first energy, simultaneously, the voltage of first electrode and second electrode all remains on first voltage.Method also comprises with the resonance between inductor and the plate condenser and first energy voltage of first electrode is become second voltage, simultaneously, the voltage of second electrode remains on first voltage, recover energy with in inductor, keeping, simultaneously, the voltage of first electrode and second electrode remains on second voltage and first voltage respectively.

According to a further aspect in the invention, the driving method of plasma display panel is provided, plasma display panel has first electrode and second electrode that forms plate condenser therebetween, method comprises with the resonance between first inductor and the plate condenser voltage of first electrode is become second voltage, simultaneously, make the voltage of second electrode remain on first voltage, wherein, first inductor is connected to first electrode, and the voltage of first electrode and second electrode is remained on second voltage and first voltage respectively.Method also comprises with the resonance between second inductor and the plate condenser voltage of first electrode is become first voltage, simultaneously, make the voltage of second electrode remain on first voltage, second inductor is connected to first electrode, and the voltage of first electrode and second electrode is remained on first voltage.

According to a further aspect in the invention, the driving arrangement of plasma display panel is provided, plasma display panel has first electrode and second electrode that forms plate condenser therebetween, and equipment comprises: the inductor that is connected to first electrode; Improve first path of tertiary voltage through inductor; With first power supply that provides first voltage to use to inductor injection first direction electric current, simultaneously, the voltage of first electrode and second electrode all remains on first voltage, and tertiary voltage is between first voltage and second voltage.Equipment also comprises second path, cause LC resonance with tertiary voltage and inductor, plate condenser makes the voltage of first electrode become second voltage from first voltage, and second electrode remains on first voltage, the electric current of first direction flows to inductor, the second source of Third Road footpath through second voltage is provided improves tertiary voltage, inductor injects inductor with the second direction electric current, and the voltage of first electrode and second electrode remains on second voltage and first voltage respectively, and second direction is opposite with first direction.And, equipment comprises the 4th path, and LC resonance and tertiary voltage with plate condenser and inductor cause become first voltage with the voltage with first electrode from second voltage, and remaining on the electric current of first voltage and second direction, the voltage of second electrode flows to inductor.

According to a further aspect in the invention, the driving arrangement of plasma display panel is provided, plasma display panel has first electrode and second electrode that forms plate condenser therebetween, and equipment comprises: first inductor and second inductor that is connected to first electrode; With first resonant path, be used between first inductor and plate condenser, causing resonance, the voltage of first electrode is become second voltage, and the voltage of second electrode remains on first voltage.The present invention also provides second resonant path, is used for causing resonance between second inductor and plate condenser, the voltage of first electrode is become first voltage, and the voltage of second electrode remains on first voltage.The inductance value that the inductance value that first inductor has has less than second inductor.

According to a further aspect in the invention, the invention provides the driving method of plasma display panel, plasma display panel has first electrode and second electrode that forms plate condenser therebetween, method may further comprise the steps: first energy is stored in the inductor, and this inductor is connected between the capacitor and plate condenser that charges with predetermined voltage; Plate condenser charges and storage second energy in inductor by the inductor with the charging of first energy.Method comprises that also plate condenser passes through the inductor discharge with the charging of second energy, with the predetermined voltage of value control of first energy and second energy.

Description of drawings

Accompanying drawing is included in the instructions, and becomes a component part of instructions, and the description of drawings embodiments of the invention are used from the principle of explaining invention with instructions one.

Fig. 1 is the schematic block diagram of PDP according to an embodiment of the invention;

Fig. 2 is the schematic circuit diagram according to the holding circuit of the first embodiment of the present invention;

Fig. 3 is the driving sequential chart according to the holding circuit of the first embodiment of the present invention;

Fig. 4 A is the circuit diagram that illustrates according to the current path of each pattern of the holding circuit of the first embodiment of the present invention to 4H;

Fig. 5 is the chart that the state of charhing unit mesospore electric charge is shown;

Fig. 6 is the driving sequential chart of holding circuit according to a second embodiment of the present invention;

Fig. 7 is the schematic circuit diagram of the holding circuit of a third embodiment in accordance with the invention;

Fig. 8 is the driving sequential chart of the holding circuit of a third embodiment in accordance with the invention;

Fig. 9 A is the circuit diagram of current path of each pattern that the holding circuit of a third embodiment in accordance with the invention is shown to 9H;

Figure 10,11 and 12 is the discharge current of the capacitor in the holding circuit of a third embodiment in accordance with the invention and the synoptic diagram of charging current;

Figure 13 is the schematic circuit diagram of the holding circuit of a fourth embodiment in accordance with the invention;

Figure 14 is the driving sequential chart of the holding circuit of a fourth embodiment in accordance with the invention;

Figure 15 is the schematic circuit diagram of holding circuit according to a fifth embodiment of the invention;

Figure 16 is the driving sequential chart of holding circuit according to a fifth embodiment of the invention.

Embodiment

In the following detailed description, the best mode of thinking with the present inventor is an example, illustrates and described exemplary embodiments of the present invention.Just as will be seen, without departing from the scope of the invention, the present invention can be improved with various tangible aspects.Therefore, drawing and description come down to be used for explanation invention rather than restriction invention.

Below with reference to driving arrangement and the driving method of accompanying drawing detailed description according to the PDP of the embodiment of the invention.

Fig. 1 is the schematic block diagram according to the PDP of the embodiment of the invention.As shown in Figure 1, PDP for example comprises: plasma panel 100, address driver 200, scanning/lasting driver element 300 and controller 400.

Plasma panel 100 comprises: a plurality of by being listed as address electrode A1-Am that disposes and a plurality of scan electrode Y that press the row alternate configurations ₁-Y _n(below be called " Y electrode ") and a plurality of maintenance electrode X ₁-X _n(below be called " X electrode ").X electrode X ₁-X _nForm corresponding Y electrode Y respectively ₁-Y _nEach X electrode has an end to be connected to an end of each Y electrode.Controller 400 receives external image signal, produces address drive control signal and Sustainable Control signal, and the control signal that produces is added to address driver 200 and scanning/lasting driver element 300 respectively.

Address driver 200 receives the address drive control signal of self-controller 400, and adds display data signal for each address electrode, is used to select the discharge cell that will show.Scanning/continue the Sustainable Control signal that driver element 300 receives self-controller 400, and alternately add the maintenance pulse for Y electrode and X electrode.Added maintenance pulse causes continuous discharge on selected discharge cell.

Below describe scanning according to first embodiment of the invention/the continue holding circuit of driver element 300 in detail referring to Fig. 2,3 and 4.

Fig. 2 is the schematic circuit diagram according to the holding circuit of first embodiment of the invention.As shown in Figure 2, the holding circuit according to first embodiment of the invention comprises: Y electrode driver 310, X electrode driver 320, Y electrode supply recovery section 330 and X electrode supply recovery section 340.

Y electrode driver 310 is connected to X electrode driver 320, plate condenser C _pBe connected between Y electrode driver 310 and the X electrode driver 320.Y electrode driver 310 comprises switch Y _sAnd Y _g, X electrode driver 320 comprises switch X _sAnd X _gY electrode supply recovery section 330 comprises inductor L ₁With switch Y _rAnd Y _fX electrode supply recovery section 340 comprises inductor L ₂With switch X _rAnd X _fThese switches Y _s, Y _g, X _s, X _g, Y _r, Y _f, X _rAnd X _fBe used as the MOSFET with body diode and illustrate, still, in order to satisfy following function, they can also be other switches.

Switch Y _sAnd Y _gBeing connected in series in provides voltage V _s/ 2 power supply Vs/2 with voltage-V is provided _sBetween power supply-Vs/2 of/2, their contact is connected to plate condenser C _pThe Y electrode.Equally, switch X _sAnd X _gBe connected in series between power supply Vs/2 and the power supply-Vs/2, their contact is connected to plate condenser C _pThe X electrode.

Inductor L ₁An end be connected to plate condenser C _pThe Y electrode, switch Y _rAnd Y _fBe connected in inductor L in parallel ₁The other end and earth terminal 0 between.Equally, inductor L ₂An end be connected to plate condenser C _pThe X electrode, switch X _rAnd X _fBe connected in inductor L in parallel ₂The other end and earth terminal 0 between.Y electrode supply recovery section 330 also comprises diode D _Y1And D _Y2, being used to prevent may be by switch Y _rAnd Y _fThe current path that forms of body diode.Same X electrode supply recovery section 340 also comprises diode D _X1And D _X2, being used to prevent may be by switch X _rAnd X _fThe current path that forms of body diode.Y electrode supply recovery section 330 and X electrode supply recovery section 340 also comprise a plurality of clamp diodes respectively, are used to prevent inductor L ₁And L ₂The other end on voltage respectively greater than V _s/ 2 or less than-V _s/ 2.

Below referring to Fig. 3 and Fig. 4 A-4H sequential operation according to the holding circuit of first embodiment of the invention is described.Fig. 3 is the driving sequential chart according to the holding circuit of first embodiment of the invention.Fig. 4 A is the circuit diagram that illustrates according to the current path of each pattern of the holding circuit of first embodiment of the invention to 4H.The operation is here undertaken by 16 pattern M1-M16 that change with switching manipulation.At switch Y _r, Y _f, X _rAnd X _fDuring conducting, " LC resonance " phenomenon described here is not continuous oscillation, but inductor L ₁Or L ₂With plate condenser C _pCan cause that voltage and current changes.

Before the circuit operation according to first embodiment of the invention, switch Y _gAnd X _gBe in " ON " (conducting) state, so, plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xAll remain on-V _s/ 2.And, plate condenser C _pElectric capacity be C, inductor L ₁And L ₂Inductance value be respectively L ₁And L ₂.

In the process of pattern 1 M1, shown in Fig. 3 and 4A, switch Y _rConducting, switch Y _gAnd X _gBe in " ON " state.Then, comprise earth point O, switch Y through order _r, inductor L ₁With switch Y _gCurrent path flow into inductor L ₁Electric current I _L1Press V _s/ 2L ₁Gradient increase.In the process of pattern 1M1, electric current injects inductor L ₁, and plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xAll remain on-V _s/ 2.That is to say that energy storage (charging) is at inductor L ₁In.If pattern 1M1 is cycle duration Δ t ₁, provide with following formula so and flow to inductor L when pattern 1M1 finishes ₁In electric current I _P1

$I_{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="A20071008549200171.png,A20071008549200211.png"\; state="\{\{state\}\}">p</figure-callout>}1}=\frac{V_s}{2{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A20071008549200171.png,A20071008549200211.png"\; state="\{\{state\}\}">L</figure-callout>}}_1}\mathrm{\&Delta;}{t}_1$ [formula 1]

In the process of pattern 2 M2, shown in Fig. 3 and 4B, switch Y _gDisconnect (OFF), formation comprises in order: earth point O, switch Y _r, inductor L ₁, plate condenser C _p, switch X _g, and the current path of power supply-Vs/2, cause LC resonance thus.Because LC resonance is by switch Y _sBody diode cause plate condenser C _pY electrode voltage V _yRaising, specifically is to be elevated to V _s/ 2.The electric current of scheduled volume flows to inductor L ₁Shi Yinqi LC resonance, so, plate condenser C _pY electrode voltage V _yBe elevated to V _s/ 2 required time Δ T _rDepend on and flow to inductor L in the resonant process ₁Electric current I _PlThat is, as shown in Equation 2, with the electric current I of pattern 1M1 _P1The time cycle Δ t that injects ₁Determine Y electrode voltage V _yRising time Δ T _r

$\mathrm{\&Delta;}{T}_r=\sqrt{L_1{C}_p}[{\cos }^{-1}(-\frac{V_s/2}{\sqrt{{(V_s/2)}^2+{\left(I_{p1}\sqrt{{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A20071008549200171.png,A20071008549200211.png"\; state="\{\{state\}\}">L</figure-callout>}}_1/C_p}\right)}^2}})-{\tan }^{-1}\frac{I_{p1}\sqrt{{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="A20071008549200171.png,A20071008549200211.png"\; state="\{\{state\}\}">L</figure-callout>}}_1/C_p}}{V_s/2}]$ [formula 2]

In the process of mode 3 M3, Y electrode voltage V _yBe elevated to V _s/ 2 o'clock switch Y _sConducting, so, Y electrode voltage V _yRemain on V _s/ 2.Shown in Fig. 4 C, comprise switch Y in order _r, inductor L ₁With switch Y _sThe current path of body diode on flow into inductor L ₁Electric current I _L1By-V _s/ 2L ₁Gradient be reduced to OA.That is, flow into inductor L ₁Electric current I _L1Be recovered to power supply Vs/2.

Referring to Fig. 3 and 4D, in the process of pattern 4M4, flow into inductor L ₁Electric current I _L1Become switch Y behind the 0A _rDisconnect switch Y _sAnd X _gBe in " ON " state, plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xRemain on V respectively _s/ 2 and-V _s/ 2.Voltage difference (V between Y electrode and the X electrode _y-V _x) equal the essential voltage V of continuous discharge _s(below be called continuous discharge voltage) causes continuous discharge.

Referring to Fig. 3 and 4E, in the process of pattern 5 M5, switch Y _fConducting, switch Y _sAnd X _gBe in " ON " state.Then, formation comprises power supply V in proper order _s/ 2, switch Y _s, inductor L ₁, switch Y _fWith the current path of earth terminal O, make to flow into inductor L ₁Electric current by-V _s/ 2L ₁Gradient reduce.In the process of pattern 5M5, be injected into inductor L with the electric current of the current reversal of pattern 1M1 ₁, simultaneously, plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xRemain on V respectively _s/ 2 and-V _s/ 2.That is, at inductor L ₁In charge into energy.

Referring to Fig. 3 and 4F, in the process of pattern 6M6, switch Y _sDisconnect, formation comprises sequenced switch X _gBody diode, plate condenser C _p, inductor L ₁, switch Y _fWith the current path of earth terminal O, cause LC resonance thus.Since LC resonance, switch Y _gBody diode make plate condenser C _pY electrode voltage V _yReduce, specifically be reduced to-V _s/ 2.2 M2 are the same with pattern, at the electric current inflow inductor L of scheduled volume ₁Shi Yinqi LC resonance.Therefore, plate condenser C _pY electrode voltage V _yBe reduced to-V _s/ 2 required time Δ T _fDepend on and flow into inductor L in the resonant process ₁Electric current.That is, as above description, in the process of pattern 5M5, when electric current injects inductor L about pattern 1M1 ₁The time with cycle time Δ t ₅Be determined at and flow into inductor L in the resonant process ₁Electric current.

In the process of mode 7 M7, Y electrode voltage V _yBe reduced to-V _s/ 2 o'clock switch Y _gConducting, so, Y electrode voltage V _yRemain on-V _s/ 2.Shown in Fig. 4 G, comprising switch Y in order _gBody diode, inductor L ₁And switch Y _fCurrent path on flow into inductor L ₁Electric current I _L1Press V _s/ 2L ₁Gradient be elevated to 0A.

Referring to Fig. 3 and 4H, in the process of pattern 8M8, flow into inductor L ₁Electric current I _L1Become switch Y behind the OA _fDisconnect.Switch Y _gAnd X _gBe in " ON " state, plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xAll remain on-V _s/ 2.

At pattern 1 M1 in the process of pattern 8M8, plate condenser C _pTwo ends between voltage (V _y-V _x) (below be called " plate voltage ") at 0V to V _sBetween the change.At the switch X of pattern 9M9 in the process of pattern 16M16 _s, X _g, X _rAnd X _fWith switch Y _s, Y _g, Y _rAnd Y _fMode of operation respectively with at the switch Y of pattern 1M1 in the process of pattern 8M8 _s, Y _g, Y _rAnd Y _fWith switch X _s, X _g, X _rAnd X _fMode of operation identical.At the plate condenser C of pattern 9M9 in the pattern 16M16 _pX electrode voltage V _xWith the Y electrode voltage V of pattern 1M1 in the pattern 8M8 _yHas identical waveform.Therefore, the plate voltage (V of pattern 9M9 in the pattern 16M16 _y-V _x) arrive-V at 0V _sBetween the change.The operation according to the holding circuit of first embodiment of the invention of pattern 9M9 in the pattern 16M16 is that industry technician is known, therefore this is not described in detail.

According to first embodiment of the invention,, be injected into inductor L by regulating electric current by pattern 1M1 ₁Time cycle Δ t _lCan control the rising time Δ T of plate voltage _rEqually, in the process of pattern 5M5, be injected into inductor L by regulating electric current _lTime cycle Δ t ₅, can control the reduction time Δ T of plate voltage _f

Plate condenser C _pX and the wall state of charge in the zone between the Y electrode, promptly the state of discharge cell is uneven, so, the wall voltage difference of each discharge cell, as shown in Figure 5.As in discharge cell 51, along with a small amount of accumulation of wall electric charge, wall voltage V _W1Low, discharge igniting voltage height.As in discharge cell 52, along with a large amount of accumulations of wall electric charge, wall voltage V _W2Height, discharge igniting voltage is low.If the wall voltage height is as in discharge cell 52, at plate voltage (V _y-V _x) can produce discharge in the process that raises.That is, among the pattern 2M2, when being in off-state, switch Ys discharges, so, by inductor L ₁Rather than provide the electric energy of continuous discharge by power supply Vs/2.When mode 3 M3 begins, switch Y _sConducting causes secondary discharge.When twice discharge occurring, there is not uniform light emission on the whole flat board.Therefore, plate voltage (V _y-V _x) rising time Δ T _rPreferably being short to is enough to prevent this uneven discharge.

As plate voltage (V _y-V _x) when reducing rapidly,, cause that the wall CHARGE DISTRIBUTION in the discharge cell is inhomogeneous because the resonance movement of electric charges that the quick variation of electric field causes can cause wiping certainly of wall electric charge.Otherwise, plate voltage (V _y-V _x) slowly reduce, make wall voltage owing to the compound of space charge reduces, can not cause from wiping.Therefore, preferred plate voltage (V _y-V _x) reduction time Δ T _fThan its time Δ T that raises _rLong.

As shown in Figure 6, according to second embodiment of the invention, be injected into inductor L in the process of pattern 1M1 ₁The time cycle Δ t of electric current ₁Be injected into inductor L in the process than pattern 5M5 ₁The time cycle Δ t of electric current ₅Long.Therefore, plate voltage (V _y-V _x) rising time Δ T _rReduce time Δ T than it _fShort.

Referring to Fig. 3 and 6,, in the process of pattern 9 M9, flow into inductor L according to first embodiment of the invention ₁Electric current all reclaim after-current and inject inductor L ₂But, inductor L ₂Electric current inject and both can be undertaken also can being undertaken by mode 7 M7 by pattern 8M8.That is, by first embodiment, the inductor L that in the process of pattern 9M9, occurs ₂Electric current inject, also can appear among the mode 7 M7 or appear among the pattern 8M8.By this mode, plate voltage (V _y-V _x) time cycle of remaining on 0V becomes shorter than the time cycle among first embodiment.

According to the first and second aspects of the present invention, power supply Vs/2 and-voltage that Vs/2 provides is respectively V _s/ 2 and-V _s/ 2, so Y electrode voltage V _yWith X electrode voltage V _xBetween voltage difference be the required voltage V of continuous discharge _sDifferent therewith, continuous discharge voltage V _sCan be added to Y electrode and X electrode respectively with ground voltage 0V, this also can describe in detail afterwards, referring to Fig. 7, and 8 and 9A-9H.

Fig. 7 is the simple holding circuit according to third embodiment of the invention, and Fig. 8 is the driving sequential chart according to the holding circuit of third embodiment of the invention, and Fig. 9 A-9H is the current path according to each pattern of the holding circuit of third embodiment of the invention.

In the holding circuit shown in Figure 7, different with first preferred embodiment, switch Y _sAnd X _sBeing connected to provides continuous discharge voltage V _sPower supply Vs, switch Y _gAnd X _gBe connected to the earth terminal 0 that ground voltage 0V is provided.And, capacitor C _Yer1And C _Yer2Be connected in series between power supply Vs and the earth terminal 0 switch Y _rAnd Y _fBe connected to capacitor C _Yer1And C _Yer2Node.By same mode, capacitor C _Xer1And C _Xer2Be connected in series between power supply Vs and the earth terminal 0 switch X _rAnd X _fBe connected to capacitor C _Xer1And C _Xer2Node.Capacitor C _Yer1And C _Yer2With capacitor C _Xer1And C _Xer2Respectively with voltage V1, V2, V3 and V4 charging.

Referring to Fig. 8, and 9A-9H, suppose that voltage V2 and V4 are continuous discharge voltage V _sHalf, i.e. V _s/ 2, the operation according to the holding circuit of third embodiment of the invention is described now.

In the process of pattern 1M1, as shown in Figure 8, switch Y _rConducting, switch Y _gAnd X _gBe in " ON " state.Then, flow into inductor L through the current path shown in Fig. 9 A ₁Electric current I _L1Press V _s/ 2L ₁Gradient increase.That is, in the process of pattern 1M1, electric energy charges into inductor L ₁, and plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xAll remain on 0V.

In the process of pattern 2M2, switch Y _gDisconnect, form current path shown in Fig. 9 B, and cause LC resonance.Since LC resonance, switch Y _sBody diode make plate condenser C _pY electrode voltage V _yRaise, specifically be elevated to V _sBy the mode identical, when the electric current of scheduled volume flows to inductor L with first preferred embodiment of the invention ₁The time LC resonance (simultaneously, energy stores in the inductor) appears.

In the process of mode 3 M3, plate condenser C _pY electrode voltage V _yBe elevated to V _sShi Kaiguan Y _sConducting, so, Y electrode voltage V _yRemain on V _sFlow to inductor L by the current path shown in Fig. 9 C ₁Electric current I _L1Be recovered to capacitor C _Yer1In.

Referring to Fig. 8 and 9D, in the process of pattern 4M4, flow into inductor L ₁Electric current I _L1Become switch Y behind the 0A _rDisconnect.Switch Y _sAnd X _gBe in " ON " state, plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xRemain on V respectively _sAnd 0V.Because the voltage difference (V between Y electrode and the X electrode _y-V _x) become continuous discharge voltage, so continuous discharge occurs.

In the process of pattern 5M5, switch Y _fConducting, switch Y _sAnd X _gBe in " ON " state.Then, shown in Fig. 9 E, form current path, flow into inductor L ₁Electric current by-V _sThe gradient of/2L1 reduces.In the process of pattern 5M5, inject inductor L with the electric current of the current reversal of pattern 1M1 ₁, and plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xRemain on V respectively _sAnd 0V.Be that energy is at inductor L ₁Middle charging.

In the process of pattern 6 M6, switch Y _sDisconnect, form the current path shown in Fig. 9 F, cause LC resonance thus.Because LC resonance is by switch X _gBody diode cause plate condenser C _pY electrode voltage V _yReduce, specifically be reduced to 0V.2M2 is the same with pattern, when the electric current of scheduled volume flows to inductor L ₁The time (, when energy is stored in the inductor) LC resonance appears.

In the process of mode 7 M7, as plate condenser C _pY electrode voltage V _yWhen being reduced to 0V, switch X _gConducting, so, Y electrode voltage V _yRemain on 0V.Shown in Fig. 9 G, flow to inductor L ₁Electric current I _L1Be recovered to capacitor C _Yer2In.

Referring to Fig. 8 and 9H, in the process of pattern 8M8, flow into inductor L ₁Electric current I _L1Become switch Y behind the 0A _fDisconnect.Switch Y _gAnd X _gBe in " ON " state.Plate condenser C _pY electrode voltage V _yWith X electrode voltage V _xAll remain on 0V.

According to the pattern 1M1 of third embodiment of the invention in the process of pattern 8M8, identical with first embodiment, plate voltage (V _y-V _x) at 0V and V _sBetween the change.As shown in Figure 8, at the switch X of pattern 9M9 in the process of pattern 16M16 _s, X _g, X _rAnd X _fWith switch Y _s, Y _g, Y _rAnd Y _fMode of operation respectively with at the switch Y of pattern 1M1 in the process of pattern 8M8 _s, Y _g, Y _rAnd Y _fWith switch X _s, X _g, X _rAnd X _fMode of operation identical.

By the 3rd embodiment, by control capacitor C _Yer2In charging voltage V ₂Can control the rising time and the reduction time of plate voltage.That is to say, by gauge tap Y _rAnd Y _gContinue cycle and the gauge tap Y of the pattern 1M1 of conduction period _sAnd Y _fContinue the cycle of pattern 5 M5 of conduction period, can control capacitor C _Yer2Voltage level.

Referring to Figure 10 to 12 illustrated capacitor C _Yer2The voltage level control method.

Figure 10 to 12 is according to the capacitor C in the holding circuit of second embodiment of the invention _Yer2Discharge current figure and charging current figure.

As shown in figure 10, the cycle Δ t of pattern 1 ₁Cycle Δ t with pattern 5 ₅When equating, capacitor C in the process of pattern 1 _Yer2The discharge current amount be substantially equal to capacitor C in the process of pattern 5 _Yer2The charging current amount.Therefore, capacitor C _Yer1With capacitor C _Yer2The voltage at two ends remains on V _s/ 2.

In this example, as shown in Figure 8, in the process of pattern 2 and pattern 6, flow to inductor L ₁Electric current I _L1When intensity is maximum, plate condenser C _pY electrode voltage V _yBasically reach V _s/ 2.

As shown in figure 11, the cycle Δ t of pattern 1M1 ₁Become the cycle Δ t that is shorter than pattern 5M5 ₅The time, capacitor C _Yer2The discharge current quantitative change become less than capacitor C _Yer2The charging current amount, therefore, capacitor C _Yer2The voltage V at two ends ₂Become greater than capacitor C _Yer1The voltage V at two ends ₁That is to say V ₂＞V _s/ 2.

In this example, owing to make inductor L ₁With plate condenser C _pThe added voltage V of resonance ₂＞V _s/ 2, when flowing to inductor L ₁Electric current I _L1When intensity becomes maximum, plate condenser C _pY electrode voltage V _yBecome greater than V _s/ 2.Therefore, if from electric current I _L1The maximum of intensity begins through Y electrode voltage V after a while _yBecome V _s, so, the rising time Δ T of plate voltage _rCan shorten.

As shown in figure 12, the cycle Δ t of pattern 1 ₁Cycle Δ t than pattern 5 ₅When long, capacitor C _Yer2The discharge current amount greater than at capacitor C _Yer2The charging current amount, capacitor C _Yer2The voltage V2 at two ends is less than capacitor C _Yer1The voltage V1 at two ends.That is to say V ₂＜V _s/ 2.

In this example, owing to make inductor L in the process of pattern 2 ₁With plate condenser C _pThe added voltage V of resonance ₂＜V _s/ 2, when flowing to inductor L ₁Electric current I _L1When intensity becomes maximum, plate condenser C _pY electrode voltage V _yBecome less than V _s/ 2.Therefore, if from electric current I _L1The maximum of intensity begins the Y electrode voltage V after the time through a segment length _yBecome V _s, so, the rising time Δ T of plate voltage _rCan be elongated.

Among the 3rd above-mentioned embodiment, by the cycle of control model 1M1 and pattern 5M5, can be with capacitor C _Yer2Control of Voltage be not V _s/ 2.Can remove capacitor C in this example _Yer1, electric current can be recovered to power supply Vs in mode 3 M3.

And, provide the power supply of voltage V2 can be without capacitor C _Yer2Described as second embodiment, in this example, by voltage V2 is arranged to V _s/ 2 and cycle of control model 1M1 and pattern 5M5, can control the rising time and the reduction time of plate voltage.

In the circuit shown in Figure 7, capacitor C _Yer2Can be connected to switch Y _rAnd Y _fRather than be connected to earth terminal 0.Therefore, by control capacitor C _Yer2Discharge current (pattern 1) and charging current (pattern 5) rising time and the reduction time that can control plate voltage.And power supply is free of attachment to capacitor C _Yer2

By first, second and the 3rd embodiment, the Y electrode is making alive V respectively _sAnd 0V, or voltage V _s/ 2 and-V _s/ 2.Different therewith, electrode Y can add that to have voltage difference be V _sTwo voltage V _hAnd V _h-V _s-

Driving method according to first embodiment of the invention can be used to drive circuit shown in Figure 13.

Figure 13 is the schematic circuit diagram according to the holding circuit of fourth embodiment of the invention, and Figure 14 is the driving sequential chart according to the holding circuit of fourth embodiment of the invention.

As shown in figure 13, identical according to the holding circuit of fourth embodiment of the invention with the holding circuit described in first embodiment, be voltage-V _s/ 2 can't help that power supply-Vs/2 provides but the electricity consumption container C ₁And C ₂Provide.

More particularly, the holding circuit according to fourth embodiment of the invention also comprises switch Y _h, Y _l, X _hAnd X ₁, capacitor C ₁And C ₂And diode D _Y3And D _X3Capacitor C ₁And C ₂Use voltage V _s/ 2 chargings.Switch Y _hAnd Y _lBe connected in series between power supply Vs/2 and the earth terminal 0 capacitor C ₁With diode D _Y3Be connected in series in switch Y _hAnd Y _lContact and earth terminal 0 between.Switch Y _sBe connected to switch Y _hAnd Y _lContact, switch Y _gBe connected to capacitor C ₁With diode D _Y3Contact.Equally, switch X _hAnd X ₁Be connected in series between power supply Vs/2 and the earth terminal 0 capacitor C ₂With diode D _X3Be connected in series in switch X _hAnd X _lContact and earth terminal 0 between, switch X _sBe connected to switch X _hAnd X _lContact, switch X _gBe connected to capacitor C ₂With diode D _X3Contact.

As shown in figure 14, identical according to the operation of the holding circuit of fourth embodiment of the invention with operation according to the holding circuit of first embodiment of the invention, switch Y just _h, Y _l, X _hAnd X _lRespectively with switch Y _s, Y _g, X _sAnd X _gOperation simultaneously.More particularly, switch Y _sAnd Y _hConducting is simultaneously given plate condenser C by power supply Vs/2 _pVoltage V is provided _s/ 2.Equally, switch X _sAnd X _hConducting is simultaneously given plate condenser C by power supply Vs/2 _pVoltage V is provided _s/ 2.Switch Y _gAnd Y _lConducting simultaneously is by comprising earth terminal 0, switch Y in order _l, capacitor C ₁With switch Y _gThe path give plate condenser C _pVoltage-V is provided _s/ 2.Equally, switch X _gAnd X _lConducting simultaneously is by comprising earth terminal 0, switch X in order _l, capacitor C ₂With switch X _gThe path give plate condenser C _pVoltage-V is provided _s/ 2.

According to fourth embodiment of the invention, with voltage V is provided _s/ 2 power supply is given plate condenser C _pVoltage V is provided _s/ 2 and-V _s/ 2.

Although according among first to the 4th embodiment of the present invention with same inductor L ₁Raise and reduce Y electrode voltage V _y, still, also can raise and reduce Y electrode voltage V with a plurality of independently inductors _yWith two inductor L ₁₁And L ₁₂The time, can omit the step (for example, pattern M1 among Fig. 3 and M5) that electric current injects inductor.Present embodiment will describe in detail referring to Figure 15 and 16 following.

Figure 15 is the schematic circuit diagram according to the holding circuit of fifth embodiment of the invention, and Figure 16 is the driving sequential chart according to the holding circuit of fifth embodiment of the invention.

Among Figure 15, the X electrode voltage of plate condenser remains on 0V, and the Y electrode voltage in the holding circuit only is described.Remove inductor L ₁₁And L ₁₂, capacitor C _Yer, outside power supply Vs and the earth terminal 0, identical by the holding circuit of the 5th embodiment with the holding circuit described in first embodiment.

More particularly, switch Y _sAnd Y _gBe connected in series between power supply Vs and the earth terminal 0.Inductor L ₁₁Be connected switch Y _sAnd Y _gContact and switch Y _rBetween, and inductor L ₁₂Be connected switch Y _sAnd Y _gContact and switch Y _fBetween.Capacitor C _YerBe connected switch Y _rAnd Y _fContact and earth terminal 0 between.Power supply Vs provides voltage V _s, capacitor C _YerUse V _s/ 2 voltage chargings.Promptly different with first embodiment, because power supply Vs and earth terminal 0 are arranged, so Y electrode voltage V _y0 and V _sBetween the change.

Referring to Figure 16, during pattern 1M1, switch Y _rConducting is comprising capacitor C in order _Yer, switch Y _r, inductor L ₁₁With plate condenser C _pCurrent path on cause LC resonance.Because LC resonance makes plate voltage V _yRaise inductor L ₁₁Electric current I _L11Form the sinusoidal wave semiperiod.During pattern 2M2, plate voltage V _yBe elevated to V _sThe time, switch Y _rDisconnect switch Y _sConducting, plate voltage V _yRemain on V _s, that is to say, continuous discharge appears on flat board during pattern 2M2.

During mode 3 M3, switch Y _sDisconnect switch Y _fConducting is comprising plate condenser C in order _p, inductor L ₁₂, switch Y _f, and capacitor C _YerCurrent path on cause LC resonance.Because LC resonance makes plate voltage V _yReduce inductor L ₁₂Electric current I _L12Form the sinusoidal wave semiperiod.During pattern 4M4, plate voltage V _yWhen being reduced to 0V, switch Y _fDisconnect switch Y _gConducting, plate voltage V _yRemain on 0V.

By the processing of pattern 1M1 during the pattern 4M4, Y electrode voltage V _yWhen remaining on 0V, the X electrode voltage is at 0V and V _sBetween the change.In this way, can provide continuous discharge required voltage V to flat board _s

Shown in formula 3 and 4, plate voltage V _yRising time Δ T _rWith reduction time Δ T _fBe inductor L ₁₁And L ₁₂Inductance value L ₁₁And L ₁₂Function, therefore, can be by regulating inductance value L respectively ₁₁And L ₁₂Control.As mentioned above, can be with inductance value L ₁₁Be provided with lessly, and with inductance value L ₁₂Be provided with greatlyyer, therefore can make plate voltage V _yRising time Δ T ₃Shorter, and make plate voltage V _yReduction time Δ T ₄Longer.

$\mathrm{\&Delta;}{T}_r=\mathrm{\&pi;}\sqrt{L_{11}C}$ (formula 3)

$\mathrm{\&Delta;}{T}_f=\mathrm{\&pi;}\sqrt{L_{12}C}$ (formula 4)

According to fifth embodiment of the invention, identical with first embodiment, can use power supply V _S/ 2 and-V _s/ 2.That is switch Y, _sAnd Y _gBe connected respectively to power supply V _s/ 2 and-V _s/ 2, switch Y _rAnd Y _fContact be connected to earth terminal 0 rather than be connected to capacitor C _YerBy this mode, plate condenser C _pY electrode voltage V _y-V _s/ 2 and V _sChange between/2.As Y electrode voltage V _yAt V _s/ 2 o'clock, plate condenser C _pX electrode voltage V _xRemain on-V _s/ 2, so, can provide continuous discharge required voltage V to flat board _s

According to the present invention, can control the rising time and the reduction time of plate voltage.Specifically, at plate voltage rising time durations, the lengthening plate voltage time that raises can prevent secondary discharge, makes discharge evenly thus.And the reduction time ratio rising time of plate voltage is long, to prevent that the wall electric charge from from wiping, obtaining the even distribution of the wall electric charge in the discharge cell thus.

In addition, according to the present invention, the Y electrode voltage changes when keeping the X electrode voltage.As a result, the driving pulse that is added to X and Y electrode can be set arbitrarily.Because another electrode voltage changes when keeping an electrode voltage, so, improve flash-over characteristic and reduced power consumption.

Although combination is thought the most practical and preferred embodiment at present and has been described the present invention, but, should be appreciated that to the invention is not restricted to disclosed embodiment that on the contrary, the present invention will cover interior various improvement and the equivalent of invention spirit and scope that appended claims defines.

Claims (5)

1. method that is used to drive plasma display panel, described plasma display panel has first electrode and second electrode that forms plate condenser therebetween, and method may further comprise the steps:

With the resonance between first inductor and the plate condenser first electrode voltage is become second voltage, simultaneously, second electrode voltage remains on first voltage, and wherein, first inductor is connected to first electrode;

The voltage of first and second electrodes remains on second voltage and first voltage respectively;

With the resonance between second inductor and the plate condenser first electrode voltage is become first voltage, simultaneously, second electrode voltage remains on first voltage, and second inductor is connected to first electrode; With

The voltage of first and second electrodes all remains on first voltage.

2. the method for claim 1, wherein inductance value that has less than second inductor of the inductance value that has of first inductor.

3. the method for claim 1, wherein the voltage difference between second voltage and first voltage is a continuous discharge voltage.

4. equipment that is used to drive plasma display panel, described plasma display panel has first electrode and second electrode that forms plate condenser therebetween, and described equipment comprises:

Be connected to first inductor and second inductor of first electrode;

First resonant path is used for causing resonance between first inductor and plate condenser, and first electrode voltage is become second voltage, and simultaneously, second electrode voltage remains on first voltage; With

Second resonant path is used for causing resonance between second inductor and plate condenser, and first electrode voltage is become first voltage, and simultaneously, second electrode voltage remains on first voltage;

Wherein, the inductance value that has less than second inductor of the inductance value that has of first inductor.

5. method that is used to drive plasma display panel, described plasma display panel has first electrode and second electrode that forms plate condenser therebetween, said method comprising the steps of:

Plate condenser from second voltage charging to tertiary voltage, simultaneously, the voltage of second electrode remains on first voltage; With

Plate condenser is discharged into second voltage from tertiary voltage, and simultaneously, the voltage of second electrode remains on first voltage;

Wherein the cycle in duration of charging of plate condenser is shorter than cycle discharge time of plate condenser.

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