CN1202502C - Drive method and circuit of plasma display unit - Google Patents
Drive method and circuit of plasma display unit Download PDFInfo
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- CN1202502C CN1202502C CN 00122271 CN00122271A CN1202502C CN 1202502 C CN1202502 C CN 1202502C CN 00122271 CN00122271 CN 00122271 CN 00122271 A CN00122271 A CN 00122271A CN 1202502 C CN1202502 C CN 1202502C
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Abstract
The present invention relates to a drive method and a circuit for a plasma display. A plasma display unit is driven by a drive circuit, and the display unit comprises three electrodes, the two electrodes among the three electrodes are positioned at a sustaining phase so as to operate, and ionized gas is positioned between the two electrodes; the drive circuit is used for driving the ionized gas back and forth between the two electrodes so that the drive circuit can constantly send out light. The present invention comprises the drive method that (1). the two sustaining electrodes of the display unit can generate potential difference by using the drive circuit, and the ionized gas can generate electric discharge between the two electrodes; (2). when the ionized gas carries out the electric discharge, the driving circuit compensates current for the display unit so that the potential difference between the two electrodes does not reduce in vast scale because of the electric discharge of the ionized gas.
Description
Technical field
The present invention relates to a kind of driving method and driving circuit of plasma display unit, especially refer to a kind ofly utilize driving circuit that one plasma display unit is compensated an electric current, so that the potential difference (PD) that plasma display unit two is kept between the electrode can and not produce significantly low phenomenon because of ionized gas discharge wherein in (sustain) stage of keeping.
Background technology
The size of plasma scope (plasma display panel) approaches greatly, and does not have width of cloth ray, is the main flow of following large-sized monitor therefore.Include a plurality of plasma display units of lining up array (matrix) in the plasma scope, and provide an in advance selected steady job voltage by the external world, provide and drive the required power supply of a plurality of plasma display units in the plasma scope, different operating voltage can influence the general performance of plasma scope, that is to say, some operating voltage can normally drive all plasma display units, it all can normally be shown, yet some operating voltage then can't all plasma display units of driven, thereby can produce undesired demonstration, so plasma scope must operate within the operating voltage permissible range.Even but in this scope, still some operating voltage can make the display effect of plasma scope preferable, the operating voltage effect of other parts is then so not good, therefore the operating voltage of each plasma scope must suitably be selected, so that it is operated in optimized operating voltage, and whether the principle of selecting operating voltage promptly is to be as the criterion can allow all plasma display units normally show, this part is normally done thin portion by the tester and adjusted selected when plasma scope dispatches from the factory.
Please refer to Fig. 1, Fig. 1 is equivalent electrical circuit Figure 100 of existing plasma scope.The circuit characteristic of plasma scope is rough can equivalence to be considered as a capacitive load, and its drive principle provides electric current I
PDPWith to this capacitor charge and discharge, produce the AC voltage square wave V of high voltagehigh frequency by this at the electric capacity two ends
PDP, the electric charge of plasma display unit ionic medium body is driven back and forth, in the process that drives, emit ultraviolet ray and excite and be coated on the fluorescent agent on the tube wall and emit beam.Be at plasma scope and keep (sustain) during the stage, two electrodes of its capacity load are applied the AC voltage square wave of high voltagehigh frequency, can make that wherein ionized gas discharges and causes very big gas-discharge current IE in moment, and therefore cause the potential difference (PD) phenomenon significantly low or title " voltage die " (voltage notch) between two electrodes to produce.Usually the luminous intensity of plasma scope is strong more, and gas-discharge current is big more, and then the amplitude of voltage die is dark more.
Please refer to Fig. 2, Fig. 2 is the oscillogram of " voltage die " phenomenon in the existing plasma scope.The driving circuit of plasma scope is the employed plasma scope driving circuit of known products in the drawings, and when operating voltage was 170V, the amplitude 110 of voltage die had 16.4V approximately.In plasma scope, include many plasma display units, owing to can't reach fully even when making, all can there be a little difference the time of causing each plasma display unit operating voltage range and discharge current to produce, when the phenomenon that voltage die is arranged produces, the part plasma display unit can begin discharge just when voltage die takes place, thereby influence its strength of discharge, therefore can make it can't continue to keep discharge when voltage die is serious thereby cause plasma scope normally to show, also cause the working range of plasma scope narrower.The article on plasma volumetric display, though when dispatching from the factory, be adjusted to its optimized operating voltage, but plasma scope is when having used a period of time to make plasma display unit produce catabiosis, the operating voltage range of plasma scope will change, in case the operating voltage range of plasma scope has departed from the predeterminated voltage when dispatching from the factory, plasma scope can't show normally and must readjust a suitable magnitude of voltage.Take place for reducing this type of situation, then must increase the operating voltage range of plasma scope, therefore, reducing even eliminate the voltage die phenomenon can be an effective method.
Summary of the invention
Therefore fundamental purpose of the present invention is that new driving method of a kind of plasma display unit and driving circuit thereof are being provided, it can be simply and effectively drives a plasma display unit in the mode of offset current, so that it is required to provide the electric current that gives plasma scope to be enough to supply with discharge, therefore can reduce even eliminate the generation of voltage die phenomenon, to address the above problem.
For achieving the above object, the invention provides a kind of driving method of plasma display unit, this method is: this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises a quota power supply receiving end and an energy storage type current source, this quota power supply receiving end can receive and supply a quota electric current, this driving method comprises: utilize this quota power supply receiving end that this energy storage type current source is charged, make it produce an offset current, and this offset current is greater than this quota electric current; Utilize this energy storage type power supply that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And when the ionized gas of this plasma display unit discharges, utilize this energy storage type current source, this plasma display unit is supplied with this offset current, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
The present invention also provides another kind of driving method, the steps include: to utilize this quota power supply receiving end that this first electric current source generating circuit is charged, and makes it produce an offset current; Utilize this quota power supply receiving end that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And when the ionized gas of this plasma display unit discharges, power supply receiving end and this first electric current source generating circuit by norm in parallel, this plasma display unit is supplied with this quota electric current and this offset current simultaneously, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
Another driving method provided by the invention, the driving circuit that this method adopted also comprises: a quota power supply receiving end and a separate current receiving end, this quota power supply receiving end can receive and supply a quota electric current, this independent current receiving end can receive and supply an offset current, this driving method comprises: utilize this quota power supply receiving end that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And when the ionized gas of this plasma display unit discharges, power supply receiving end and this independent current receiving end by norm in parallel, this plasma display unit is supplied with this quota electric current and this offset current simultaneously, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
Simultaneously, the present invention also provides a kind of driving circuit of plasma display unit, this circuit is: this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises: a quota power supply receiving end, and this quota power supply receiving end can receive and supply a quota electric current; One first driver element, be electrically connected on one first electrode in this two electrode of this quota power supply receiving end and this plasma display unit respectively, this first driver element can make and produce one first potential difference (PD) between two electrodes of this plasma display unit, makes the ionized gas of this plasma display unit be able to discharge between this two electrode; One first electric current source generating circuit is electrically connected on this first electrode of this plasma display unit, can supply with one first offset current; An and controller, be electrically connected on this first driver element and this first electric current source generating circuit respectively, alternative this first driver element in parallel and this first electric current source generating circuit, with selectivity this plasma display unit is supplied with this quota electric current and this first offset current simultaneously, so that this two interelectrode potential difference (PD) can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
The present invention also provides another kind of driving circuit, and this circuit comprises: a quota power supply receiving end, and this quota power supply receiving end can receive and supply a quota electric current; One first driver element, be electrically connected on one first electrode in this two electrode of this quota power supply receiving end and this plasma display unit respectively, this first driver element includes an energy storage type current source, this energy storage type current source can be supplied with an offset current, this energy storage type current source can make and produce one first potential difference (PD) between two electrodes of this plasma display unit, makes the ionized gas of this plasma display unit be able to discharge between this two electrode; And a controller, being electrically connected on this first driver element and this quota power supply receiving end respectively, alternative makes this quota power supply receiving end charge to produce this offset current to this energy storage type current source; Wherein, when the ionized gas of this plasma display unit discharged, it was stable to utilize this offset current to keep this two interelectrode potential difference (PD).
Another driving circuit provided by the invention, this circuit comprises: this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises: two driver elements, be electrically connected on two electrodes of this plasma display unit respectively, be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam; One first electric current source generating circuit is electrically connected on one first electrode of this plasma display unit; And a controller, be electrically connected on this two driver element and this first electric current source generating circuit respectively, be used for controlling the operation of this two driver element and this first electric current source generating circuit; Wherein before the each discharge of this plasma display unit, this controller can utilize this two driver element that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode, and when the ionized gas discharge of this plasma display unit, this controller can utilize this first electric current source generating circuit to compensate an electric current so that the potential difference (PD) between this two electrode can not produce significantly low because of this ionized gas discharge via this plasma display unit of first electrode pair of this plasma display unit.
Another driving circuit provided by the invention, this circuit comprises: two driver elements, be electrically connected on two electrodes of this plasma display unit respectively, be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, wherein this two driver element respectively includes the electrode that a current source is electrically connected on this plasma display unit respectively; And a controller, be electrically connected on this two driver element and this two current source respectively, be used for controlling the operation of this two driver element and this first electric current source generating circuit; Wherein before the each discharge of this plasma display unit, this controller can utilize this two driver element that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode, and when the ionized gas discharge of this plasma display unit, this controller can utilize the current source of a driver element of this two driver element that this plasma display unit is compensated an electric current so that the potential difference (PD) between this two electrode can not produce significantly low because of this ionized gas discharge.
Description of drawings
Fig. 1 is the equivalent circuit diagram of known plasma scope.
Fig. 2 is the oscillogram of " voltage die " phenomenon in the known plasma scope.
Fig. 3 is the structural representation of plasma scope of the present invention system.
Fig. 4 is the circuit diagram of first kind of embodiment of bilateral driver element of plasma display unit of the present invention.
Fig. 5 is the switching time figure of switch M1 to M6 in the bilateral driver element of Fig. 4.
Fig. 6 is the sequential chart of the bilateral driver element of Fig. 4.
Fig. 7 to Figure 17 is the synoptic diagram of the bilateral driver element of Fig. 4 in different period circuit operations.
Figure 18 is the voltage and current waveform that utilizes the plasma scope of the inventive method.
Figure 19 is the circuit diagram of second kind of embodiment of bilateral driver element of plasma display unit of the present invention.
Embodiment
Fig. 3 is the structural representation of plasma scope of the present invention system 10.Plasma scope of the present invention system 10 includes a plasma display panel 12 and is used for display image, and one drive circuit 20, is used for driving and controlling the show state of plasma display 12 epigraphs.Plasma display 12 includes a plurality of plasma display units 14, has deposited ionized gas in each plasma display unit 14, in addition, also has one group of addressing-electrode 15 and two groups to keep electrode 16,18.Driving circuit 20 includes that an X keeps electrode drive unit 22, Y keeps electrode drive unit 24, addressing-electrode driver element 26 and a controller 28.X, Y keep electrode drive unit 22,24 and are used for driving X, Y respectively and keep electrode 16,18, ionized gas in the plasma display unit 14 can be kept between the electrode 16,18 in X, Y back and forth be driven, and make plasma display unit 14 be continued to emit beam.
That is present embodiment one drive circuit 20 includes: (a) quota power supply receiving end, this quota power supply receiving end can receive the electric energy of quota power supply 32 (Vdc) and supply with a quota electric current, as shown in Figure 4; (b) first driver element 22 is electrically connected on the X electrode of this quota power supply 32 and this plasma display unit 14 respectively, and this first driver element 22 includes energy storage type current source L
1, this energy storage type current source L
1Can supply with an offset current I
L1, this energy storage type current source L
1Can make between the X-Y electrode of this plasma display unit 14 and produce potential difference (PD), make the ionized gas of this plasma display unit be able to discharge between this X-Y electrode; And (c) Fig. 3 controller 28, being electrically connected on the receiving end 60 of this first driver element 22 and this quota power supply 32 respectively, alternative makes 32 pairs of these energy storage type current sources of this quota power supply L
1Charge to produce this offset current I
L1Thus, when the ionized gas of this plasma display unit 14 discharges, can utilize this offset current I
L1It is stable to keep the interelectrode potential difference (PD) of this X-Y.
Present embodiment one driving method then includes the following step: (a) utilize 60 pairs of these energy storage type current sources of these quota power supply 32 receiving ends L
1Charge, make it produce offset current I
L1, and this offset current I
L1Greater than this quota electric current; (b) utilize this energy storage type power supply L
1Produce potential difference (PD) between X-Y electrode, make the ionized gas of this plasma display unit be started from discharging between this X-Y electrode this plasma display unit; And (c) when the discharge of the ionized gas of this plasma display unit, utilize this energy storage type current source L
1, this plasma display unit is supplied with this offset current I
L1, because this offset current I
L1The quota electric current that can provide greater than quota power supply 32 (Vdc), so that the quota undercurrent that the potential difference (PD) between the X-Y electrode can not be supplied with because of original quota power supply, current potential is low when causing ionized gas to discharge.
See also Fig. 4, Fig. 4 is the circuit diagram of first kind of embodiment of bilateral driver element of plasma display 12 of the present invention.Can equivalence be considered as a capacitive load (representing) because the circuit characteristic of plasma display 12 is rough with PDP, X, Y keep the two ends that electrode drive unit 22,24 then is connected to this capacity load, be used for keeping the demonstration of a picture signal via continuing charging back and forth, therefore X, Y keep electrode drive unit 22,24 and have symmetry, its independent unit can be described as a monolateral driver element, and two can be described as a bilateral driver element 30 altogether.In addition, bilateral driver element 30 also comprises a quota voltage source 32 to provide operating voltage Vdc for give monolateral driver element 22,24 to the quota electric current, and one the control circuit (not shown) be used for controlling each switch M1～M6 in monolateral driver element 22 and 24 so that voltage source 32 is able to come article on plasma body display panel 12 to charge back and forth via monolateral driver element 22 and 24.
See also Fig. 5, Fig. 5 is the switching time figure of switch M1 to M6 in the bilateral driver element 30 of Fig. 4.The conducting of switch M1 to M6 or to open circuit be that controller 28 by bilateral driver element 30 is controlled, the conducting of ON representation switch, the OFF representation switch ends.
See also Fig. 6.Fig. 6 is the sequential chart of the bilateral driver element 30 of Fig. 4.Wherein G1, G2, G3, G4, G5, G6 represent the input signal of the grid of transistor M1, M2, M3, M4, M5, M6, and input signal G1, G2, G3, G4, G5, G6 export by the control circuit 28 of bilateral driver element 30.I
L1Be the electric current on the inductance L 1, I
L2Be the electric current on the inductance L 2, Va, Vx are the current potential at inductance L 1 two ends, and Vb, Vy are the current potential at inductance L 2 two ends, Vx, Vy and be the current potential of plasma display 12 first ends and second end.
As shown in Figure 6, between t3～t9, in between first end of this plasma display unit and second end, produce first potential difference (PD), make the ionized gas of this plasma display unit be begun to produce the ionized gas discharge, then after the ionized gas discharge of this plasma display unit, utilize this driving circuit to produce between first end of this plasma display unit and second end one with the second reverse potential difference (PD) of this first potential difference (PD), the ionized gas of this plasma display unit is begun and this two electrode between reverse ionized gas discharge, so continue to provide this first potential difference (PD) and second current potential to be worse than between first end and second end, just can make this plasma display unit continue to produce the ionized gas discharge.
See also Fig. 7 to Figure 17.Fig. 7 to Figure 17 is the synoptic diagram of the bilateral driver element 30 of Fig. 4 in different period circuit operations.The detailed control program of the control circuit of bilateral driver element 30 is as follows:
(1) the phase one circuit operation as shown in Figure 7, at t
0Before, switch M1, M3, M4 and M5 are in cut-off state, and switch M2 and M6 are in conducting state, and Va, Vb, Vx, Vy voltage are all 0V.In this stage, the A of inductance L 1 end is 0 with the voltage difference of X end, so electric current I
L1The parasitic diode D3 of switch M2 and switch M3 of can flowing through forms a fixed-size circulating current; The B end of inductance L 2 is 0 with the voltage of Y end, so electric current I
L2The parasitic diode D4 of switch M6 and switch M4 of can flowing through forms another fixed-size circulating current.
(2) the subordinate phase circuit operation as shown in Figure 8, at t
0The time, switch M2 is closed.Because inductive current has continuity, so the electric current I of inductance L 1
L1Beginning is simultaneously to the stray capacitance C1 of switch M1 discharge and stray capacitance C2 charging to switch M2, so A terminal voltage Va begins to rise.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
(3) the phase III circuit operation as shown in Figure 9, at t
1The time, A terminal voltage Va rises to Vdc, and the parasitic diode D1 of switch M1 begins conducting, the electric current I of inductance L 1
L1Begin the to flow through parasitic diode D3 of switch M3 and the parasitic diode D1 of switch M1 gets back to voltage source 32, and be stored in the energy of inductance L 1 and sent back to power end 32 this moment, reaches the function of the desired energy back of plasma scope maintenance stage driving circuit.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
(4) quadravalence section circuit operations as shown in figure 10, at t
2The time, the electric current I of inductance L 1
L1Be reduced to 0, switch M1, M3 and M4 begin conducting (because of current opposite in direction, so electric current sees through M4 parasitic diode D4 conducting).Because at t
2The time, A terminal voltage Va is Vdc, X terminal voltage Vx and Y terminal voltage Vy are all 0V, so M1, M3 and M4 are all zero voltage switching.In this stage, voltage source 32 charges to inductance L 1 through switch M1 and M3.This moment inductance L 1 A, X both end voltage difference is voltage source 32 voltage swing Vdc, so the electric current I of inductance L 1
L1Big young pathbreaker increases this electric current I with the slope of Vdc/L1
L1Be exactly the current source that is used for carrying out plasma scope discharge current compensation function after a while, size of current need to be decided by the size of plasma display 12 discharge currents of compensation, can utilize the size that changes inductance L 1 or the duration of charging t in this stage
2～t
3Length changes electric current I
L1Size.On the plasma scope product,, therefore can on control program, decide duration of charging length to obtain the size of current of full blast according to the picture mean flow rate because inductance L 1 size is fixing.The electric current I of inductance L 2
L2Situation is identical with first stage.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage, the conducting of switch M4 be for will be next plasma display 12 charging and discharging currents in two stages directly lead tieback place G, to present stage circuit operation did not influence.
(5) five-stage circuit operations as shown in figure 11, at t
3The time, switch M3 is closed, the electric current I of inductance L 1
L1The stray capacitance C3 charging of beginning article on plasma body display panel 12 and switch M3, X terminal voltage Vx begins to rise; Because the charging current of plasma display can be than inductance L 2 electric current I this moment
L2Greatly, and the voltage difference of the B of inductance L 2 end and Y end be 0 electric current I that makes inductance L 2
L2Size remains unchanged, so the charging current of the plasma display part inductance L 2 of can flowing through gets back to earth point G with switch M6, and another part switch M4 that then can flow through gets back to earth point G.
(6) the 6th stage circuit operations as shown in figure 12, at t
4The time, X terminal voltage Vx rises to Vdc, and diode Dx begins conducting, the electric current I of inductance L 1
L1Part provides the plasma display gas discharge required gas-discharge current, and the remainder diode Dx that then flows through is in the electric current I of inductance L 1
L1Can fully provide under the plasma display gas-discharge current, Vx voltage will be clamped at the voltage Vdc of voltage source 32, and thus, plasma display just can be eliminated fully because of the voltage die phenomenon that gas-discharge current produces.Keep electrode drive unit 24 parts at Y, when the gas-discharge current of the plasma display of flowing through electric current I greater than inductance L 2
L2The time, because I
L2Size still keep fixing, the unnecessary electric current switch M4 that will flow through and get back to earth point G; If work as the electric current I of the gas-discharge current of the plasma display of flowing through less than inductance L 2
L2The time, not enough electric current will form a circulating current via the parasitic diode D4 of switch M4.
(7) the 7th stage circuit operations as shown in figure 13, (the t on Fig. 6 when definite plasma display gas discharge phenomenon finishes fully
5), switch M4 just can be closed.The electric current I of inductance L 1
L1Flow through switch M1 and diode Dx forms a fixed-size circulating current, the electric current I of inductance L 2
L2The parasitic diode D6 of switch M6 and switch M6 of flowing through forms another fixed-size circulating current.
(8) the 8th stage circuit operations as shown in figure 14, at t
6The time, switch M1 is closed, the electric current I of inductance L 1
L1Beginning is simultaneously to the stray capacitance C1 of switch M1 charging and to the stray capacitance C2 discharge of switch M2, so A terminal voltage Va begins to descend.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
(9) the 9th stage circuit operations as shown in figure 15, at t
7The time, A terminal voltage Va drops to 0, and the parasitic diode D2 of switch M2 begins conducting, the electric current I of inductance L 1
L1Parasitic diode D2 and the diode Dx of switch M2 of beginning to flow through gets back to voltage source 32, and be stored in the energy of inductance L 1 and sent back to power end 32 this moment, reaches the function of the desired energy back of plasma scope maintenance stage driving circuit.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
(10) the tenth stage circuit operations as shown in figure 16, at t
8The time, the electric current I of inductance L 1
L1Be reduced to 0, switch M2 begins conducting.This moment, plasma display 12 began to produce resonance with inductance L 1 with the stray capacitance C3 of switch M3, pass to inductance L 1 with originally being stored in plasma display 12 with the energy of the stray capacitance C3 of switch M3, therefore X terminal voltage Vx begins to descend the electric current I of inductance L 1
L1(direction flow to inductance L 1 for the X end from inductance L 1 A end) begins to rise.Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
(11) the 11 stage circuit operations as shown in figure 17, at t
9The time, X terminal voltage Vx drops to 0, and the parasitic diode D3 of switch M3 begins conducting, the electric current I of inductance L 1
L1The parasitic diode D3 of switch M2 and switch M3 of flowing through forms a fixed-size circulating current; Keep electrode drive unit 24 parts, the electric current I of inductance L 2 at Y
L2Situation is identical with first stage.
By above-mentioned explanation as can be seen, because the symmetry of monolateral driver element 22 and 24, phase one is identical on circuit operation with the 11 stage, therefore ensuing circuit operation is exactly that monolateral driver element 22 and 24 both actions are exchanged mutually, repeat ten stages of above-mentioned subordinate phase to the, make inductance L 2 store an offset current in advance with gauge tap M4 and one section appropriate time of M5 conducting simultaneously, thus, when Y terminal voltage Vy rises to Vdc and makes plasma display 12 produce discharge currents, because inductive current I
L2Be enough to provide the required electric current that discharges, therefore, plasma display 12 just can and not produce significantly voltage die situation because of the discharge of ionized gas wherein yet, and plasma display 12 also is able to keep via the charging back and forth that continues the normal demonstration of its picture signal.About the detailed circuit control program of this part because of similar to above-mentioned ten stages of subordinate phase to the, this then no longer row give unnecessary details.
The required minimum voltage of whether lighting of supposing all pixels of control plasma display is 125V, if drive this plasma display panel with the known drive circuit, then because there is the voltage die of 16V, so the input voltage working range must be greater than 141V.Please refer to Figure 18, Figure 18 utilizes the inventive method to drive the voltage and current waveform of plasma display, the ON time 120 of switch M3 is 700ns, from experimental waveform figure, can see, when the gas-discharge current 130 of plasma display produces, plasma display voltage V
PDPThe phenomenon that the aforesaid voltage bust do not occur, represent current compensation method proposed by the invention will eliminate because of the voltage die phenomenon that gas discharge produces effectively really, therefore to a slice plasma display under the same operation environment, drive plasma display if change with discharge current compensating circuit of the present invention, then as long as the voltage power supply scope becomes greater than 125V, and so required voltage source voltage swing only needs 125V.Therefore the operating voltage range size has increased 16V than the known drive circuit, so the voltage die phenomenon of utilizing the discharge current compensating circuit to come the compensation plasma volumetric display can increase the operating voltage range of plasma scope really.
See also Figure 19, Figure 19 is the circuit diagram of bilateral driver element second embodiment of plasma display 34 of the present invention.Can equivalence be considered as a capacitive load (representing) because the circuit characteristic of plasma display 34 is rough with PDP, X ', Y ' keep the two ends that electrode drive unit 42,44 then is connected to this capacity load, be used for keeping the demonstration of a picture signal via lasting charging back and forth, therefore X ', Y ' keep electrode drive unit 42,44 and have symmetry, its individual unit can be described as a monolateral driver element, and two can be described as a bilateral driver element 50 altogether.In addition, bilateral driver element 50 also comprises a voltage source 62,52 and gives monolateral driver element 42,44 so that operating voltage Vs to be provided, and one controller 48 be used for controlling monolateral driver element 42 and 44 so that voltage source 62,52 is able to come article on plasma body display panel 34 to charge back and forth via monolateral driver element 42 and 44.
That is the driving circuit of present embodiment two includes: (a) quota power supply 52,62 (Vs) receiving end, and this quota power supply receiving end can receive and the supply quota electric current; (b) first driver element 42, be electrically connected on the X ' electrode of this quota power supply receiving end and this plasma display unit respectively, this first driver element 42 can make between the X '-Y ' electrode of this plasma display unit and produce potential difference (PD), makes the ionized gas of this plasma display unit be able to discharge between this X '-Y ' electrode; (3) first electric current source generating circuits 54 are electrically connected on this X ' electrode of this plasma display unit, can supply with the first offset current I
L1"; And (4) controller 48, be electrically connected on this first driver element 42 and this first electric current source generating circuit 54 respectively, alternative this first driver element 42 in parallel and this first electric current source generating circuit 54 are supplied with this quota electric current and this first offset current I with selectivity simultaneously to this plasma display unit
L1", so that the interelectrode potential difference (PD) of this X '-Y ' can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
The driving circuit of present embodiment two includes second driver element, 44, the second electric current source generating circuits 56 in addition., the structure of second driver element, 44, the second electric current source generating circuits 56 and controlled device 48 produce the second offset current I because driving
L2" method and first driver element, 42, the first electric current source generating circuits 54 similar, no longer repeat to give unnecessary details at this.
Present embodiment two driving methods then include step: (a) utilize 62 pairs of these first electric current source generating circuits 54 of this quota power supply Vs receiving end to charge, make it produce an offset current I
L1"; (b) utilize between the X '-Y ' electrode of 62 pairs of these plasma display units of this quota power supply receiving end and produce potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this X '-Y ' electrode; And (c) when the discharge of the ionized gas of this plasma display unit, in parallel should quota power supply receiving end 62 and this first electric current source generating circuit 54, this plasma display unit is supplied with this quota electric current and this offset current I simultaneously
L1", so that the interelectrode potential difference (PD) of this X '-Y ' can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
The basic structure of monolateral driver element 42,44 is the structure of known employed plasma scope driving circuit, under this basic structure, one first electric current source generating circuit 54 and one second electric current source generating circuit 56 in monolateral driver element 42,44, have been added separately, with compensation plasma body display panel 34 discharge required big electric currents of moment; Relevant for known employed plasma scope driving circuit circuit operation, do not narrated at this.Include an inductance L 1 in the first electric current source generating circuit 54 ", and include an inductance L 2 in the second electric current source generating circuit 56 ".When two switches in the first electric current source generating circuit 54 all were in conducting state, voltage source V s will " charging produces needed discharge current offset current to inductance L 1; The switch that is connected to earth point in the first electric current source generating circuit 54 is opened a way inductance L 1 " electric current will flow to the gas-discharge current that plasma display 34 comes compensation plasma body display panel 34; When two switches in the first electric current source generating circuit 54 all are in open-circuit condition, inductance L 1 " electric current will flow back to power end Vs and send unnecessary energy back to power end, wait the next one and keep cycle action again again.When two switches in the second electric current source generating circuit 56 all were in conducting state, voltage source V s will " charging produces needed discharge current offset current to inductance L 2; The switch that is connected to earth point in the second electric current source generating circuit 56 is opened a way inductance L 2 " electric current will flow to the gas-discharge current that plasma display 34 comes compensation plasma body display panel 34; When two switches in the second electric current source generating circuit 56 all are in open-circuit condition, inductance L 2 " electric current will flow back to power end Vs and send unnecessary energy back to power end, wait the next one and keep cycle action again again.
Compared with prior art, the bilateral driver element 30 of first embodiment of the invention utilizes before plasma display 12 discharges, and the practice of first conducting switch M3 and M4 makes to store an offset current in inductance L 1 and the L2 in advance, when plasma display 12 discharges, because of inductive current I
L1, I
L2Therefore through over-compensation, the electric current that provides discharge required is provided, thereby can reduces or even eliminate the situation of voltage die fully.Thus, the present invention can make the operating voltage range of plasma scope 10 increase, and further can guarantee also to keep after long-time use fixing display quality.
50 of the bilateral driver elements of second embodiment of the invention are under original circuit structure, one first electric current source generating circuit 54 and one second electric current source generating circuit 56 have been added, and under the control of controller 48, article on plasma body display panel 34 provides current compensation, can reach equally reduce or even eliminate the purpose of voltage die situation, to guarantee after long-time use, also the keeping fixing display quality of plasma scope.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of wanting patent of invention.
Claims (17)
1. utilize driving circuit to drive the driving method of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises a quota power supply receiving end and an energy storage type current source, this quota power supply receiving end can receive and supply a quota electric current, and this driving method comprises:
Utilize this quota power supply receiving end that this energy storage type current source is charged, make it produce an offset current, and this offset current is greater than this quota electric current;
Utilize this energy storage type power supply that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And
When the ionized gas of this plasma display unit discharges, utilize this energy storage type current source, this plasma display unit is supplied with this offset current, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
2. driving method as claimed in claim 1 also comprises the following steps:
After the ionized gas discharge of this plasma display unit, utilize of the two electrodes generation one and this first potential difference (PD) reverse second potential difference (PD) of this driving circuit, make the ionized gas of this plasma display unit be started from back discharge between this two electrode this plasma display unit.
3. utilize driving circuit to drive the driving method of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises a quota power supply receiving end and one first an electric current source generating circuit, this quota power supply receiving end can receive and supply a quota electric current, and this driving method comprises:
Utilize this quota power supply receiving end that this first electric current source generating circuit is charged, make it produce an offset current;
Utilize this quota power supply receiving end that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And
When the ionized gas of this plasma display unit discharges, power supply receiving end and this first electric current source generating circuit by norm in parallel, this plasma display unit is supplied with this quota electric current and this offset current simultaneously, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
4. driving method as claimed in claim 3 also comprises the following steps:
After the ionized gas discharge of this plasma display unit, utilize of the two electrodes generation one and this first potential difference (PD) reverse second potential difference (PD) of this driving circuit, make the ionized gas of this plasma display unit be started from back discharge between this two electrode this plasma display unit.
5. utilize driving circuit to drive the driving method of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam, this driving circuit comprises a quota power supply receiving end and a separate current receiving end, this quota power supply receiving end can receive and supply a quota electric current, this independent current receiving end can receive and supply an offset current, and this driving method comprises:
Utilize this quota power supply receiving end that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode; And
When the ionized gas of this plasma display unit discharges, power supply receiving end and this independent current receiving end by norm in parallel, this plasma display unit is supplied with this quota electric current and this offset current simultaneously, so that the potential difference (PD) between this two electrode can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
6. driving method as claimed in claim 5 also comprises the following steps:
After the ionized gas discharge of this plasma display unit, utilize of the two electrodes generation one and this first potential difference (PD) reverse second potential difference (PD) of this driving circuit, make the ionized gas of this plasma display unit be started from back discharge between this two electrode this plasma display unit.
7. be used to drive the driving circuit of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, this driving circuit comprises:
One quota power supply receiving end, this quota power supply receiving end can receive and supply a quota electric current;
One first driver element, be electrically connected on one first electrode in this two electrode of this quota power supply receiving end and this plasma display unit respectively, this first driver element can make and produce one first potential difference (PD) between two electrodes of this plasma display unit, makes the ionized gas of this plasma display unit be able to discharge between this two electrode;
One first electric current source generating circuit is electrically connected on this first electrode of this plasma display unit, can supply with one first offset current; And
One controller, be electrically connected on this first driver element and this first electric current source generating circuit respectively, alternative this first driver element in parallel and this first electric current source generating circuit, with selectivity this plasma display unit is supplied with this quota electric current and this first offset current simultaneously, so that this two interelectrode potential difference (PD) can be not required and low to supply with this ionized gas discharge because of this quota undercurrent.
8. driving circuit as claimed in claim 7, wherein this first electric current source generating circuit includes an inductance, wherein before this plasma display unit discharge, this controller can make this first electric current source generating circuit to this induction charging so that store an electric current in this inductance, and when the discharge of the ionized gas of this plasma display unit, this controller can make the electric current that stores in this inductance flow into this plasma display unit with as this first offset current.
9. driving circuit as claimed in claim 7, also include one second driver element and the second electric current source generating circuit that can control by this controller, be electrically connected on one second electrode in this two electrode of this plasma display unit, wherein after this plasma display unit discharge, this controller utilizes this first driver element and this second driver element to generation one and the second reverse potential difference (PD) of this first potential difference (PD) between two electrodes of this plasma display unit, make the ionized gas of this plasma display unit be started from back discharge between this two electrode, and before the ionized gas back discharge of this plasma display unit, this controller utilizes this second electric current source generating circuit to supply with one second offset current via this plasma display unit of second electrode pair of this plasma display unit so that this two interelectrode potential difference (PD) can not produce significantly low because of this ionized gas discharge.
10. be used to drive the driving circuit of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, this driving circuit comprises:
One quota power supply receiving end, this quota power supply receiving end can receive and supply a quota electric current;
One first driver element, be electrically connected on one first electrode in this two electrode of this quota power supply receiving end and this plasma display unit respectively, this first driver element includes an energy storage type current source, this energy storage type current source can be supplied with an offset current, this energy storage type current source can make and produce one first potential difference (PD) between two electrodes of this plasma display unit, makes the ionized gas of this plasma display unit be able to discharge between this two electrode; And
One controller is electrically connected on this first driver element and this quota power supply receiving end respectively, and alternative makes this quota power supply receiving end charge to produce this offset current to this energy storage type current source;
Wherein, when the ionized gas of this plasma display unit discharged, it was stable to utilize this offset current to keep this two interelectrode potential difference (PD).
11. driving circuit as claimed in claim 10, wherein the current source of this first driver element includes an inductance, when this first driver element produces this first potential difference (PD) to two electrodes of this plasma display unit, this first driver element can be to this induction charging so that store an electric current in this inductance, and when the discharge of the ionized gas of this plasma display unit, stored electric current can flow into this plasma display unit with as this offset current in this inductance.
12. be used to drive the driving circuit of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, this driving circuit comprises:
Two driver elements are electrically connected on two electrodes of this plasma display unit respectively, be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit continued to emit beam;
One first electric current source generating circuit is electrically connected on one first electrode of this plasma display unit; And
One controller is electrically connected on this two driver element and this first electric current source generating circuit respectively, is used for controlling the operation of this two driver element and this first electric current source generating circuit;
Wherein before the each discharge of this plasma display unit, this controller can utilize this two driver element that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode, and when the ionized gas discharge of this plasma display unit, this controller can utilize this first electric current source generating circuit to compensate an electric current so that the potential difference (PD) between this two electrode can not produce significantly low because of this ionized gas discharge via this plasma display unit of first electrode pair of this plasma display unit.
13. driving circuit as claimed in claim 12, wherein this first electric current source generating circuit includes an inductance, when this two driver element produces this first potential difference (PD) to two electrodes of this plasma display unit, this controller can make this first electric current source generating circuit to this induction charging so that store an electric current in this inductance, and when the ionized gas of this plasma display unit discharged, this controller can make the electric current that stores in this inductance flow into this plasma display unit to compensate the electric current that this ionized gas discharge is produced.
14. driving circuit as claimed in claim 12, also comprise the second electric current source generating circuit that to control by this controller, be electrically connected on one second electrode of this plasma display unit, wherein after this plasma display unit discharge, this controller can utilize the two electrodes generation one and this first potential difference (PD) reverse second potential difference (PD) of this two driver element to this plasma display unit, make the ionized gas of this plasma display unit be started from back discharge between this two electrode, and when the ionized gas discharge of this plasma display unit, this controller can utilize this second electric current source generating circuit to compensate an electric current so that the potential difference (PD) between this two electrode can not produce significantly low because of this ionized gas discharge via this plasma display unit of second electrode pair of this plasma display unit.
15. driving circuit as claimed in claim 14, wherein this second electric current source generating circuit includes an inductance, when this two driver element produces this second potential difference (PD) to two electrodes of this plasma display unit, this controller can make this second electric current source generating circuit to this induction charging so that store an electric current in this inductance, and when the ionized gas of this plasma display unit discharged, this controller can make the electric current that stores in this inductance flow into this plasma display unit to compensate the electric current that this ionized gas discharge is produced.
16. be used to drive the driving circuit of the plasma display unit of plasma scope, this plasma display unit includes two electrodes, there is an ionized gas therebetween, this driving circuit be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, this driving circuit comprises:
Two driver elements, be electrically connected on two electrodes of this plasma display unit respectively, be used for back and forth driving this ionized gas between this two electrode so that this plasma display unit is continued to emit beam, wherein this two driver element respectively includes the electrode that a current source is electrically connected on this plasma display unit respectively; And
One controller is electrically connected on this two driver element and this two current source respectively, is used for controlling the operation of this two driver element and this two current source;
Wherein before the each discharge of this plasma display unit, this controller can utilize this two driver element that two electrodes of this plasma display unit are produced one first potential difference (PD), make the ionized gas of this plasma display unit be started from discharging between this two electrode, and when the ionized gas discharge of this plasma display unit, this controller can utilize the current source of a driver element of this two driver element that this plasma display unit is compensated an electric current so that the potential difference (PD) between this two electrode can not produce significantly low because of this ionized gas discharge.
17. driving circuit as claimed in claim 16, wherein the current source of this two driver element all includes an inductance, when this two driver element produces this first potential difference (PD) to two electrodes of this plasma display unit, one driver element of this two driver element can be to the induction charging of this driver element so that store an electric current in this inductance, and when the ionized gas of this plasma display unit discharged, stored electric current can flow into this plasma display unit to compensate the electric current that this ionized gas discharge is produced in this inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00122271 CN1202502C (en) | 2000-08-01 | 2000-08-01 | Drive method and circuit of plasma display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00122271 CN1202502C (en) | 2000-08-01 | 2000-08-01 | Drive method and circuit of plasma display unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1336628A CN1336628A (en) | 2002-02-20 |
| CN1202502C true CN1202502C (en) | 2005-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00122271 Expired - Fee Related CN1202502C (en) | 2000-08-01 | 2000-08-01 | Drive method and circuit of plasma display unit |
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| Country | Link |
|---|---|
| CN (1) | CN1202502C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313993C (en) * | 2002-12-10 | 2007-05-02 | 友达光电股份有限公司 | Driver for plasma display plate and its driving method |
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2000
- 2000-08-01 CN CN 00122271 patent/CN1202502C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1336628A (en) | 2002-02-20 |
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